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/* Remote target communications for serial-line targets in custom GDB protocol
Copyright (C) 1988-2012 Free Software Foundation, Inc.
This file is part of GDB.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>. */
/* See the GDB User Guide for details of the GDB remote protocol. */
#include "defs.h"
#include "gdb_string.h"
#include <ctype.h>
#include <fcntl.h>
#include "inferior.h"
#include "bfd.h"
#include "symfile.h"
#include "exceptions.h"
#include "target.h"
/*#include "terminal.h" */
#include "gdbcmd.h"
#include "objfiles.h"
#include "gdb-stabs.h"
#include "gdbthread.h"
#include "remote.h"
#include "regcache.h"
#include "value.h"
#include "gdb_assert.h"
#include "observer.h"
#include "solib.h"
#include "cli/cli-decode.h"
#include "cli/cli-setshow.h"
#include "target-descriptions.h"
#include <ctype.h>
#include <sys/time.h>
#include "event-loop.h"
#include "event-top.h"
#include "inf-loop.h"
#include <signal.h>
#include "serial.h"
#include "gdbcore.h" /* for exec_bfd */
#include "remote-fileio.h"
#include "gdb/fileio.h"
#include "gdb_stat.h"
#include "xml-support.h"
#include "memory-map.h"
#include "tracepoint.h"
#include "ax.h"
#include "ax-gdb.h"
/* Temp hacks for tracepoint encoding migration. */
static char *target_buf;
static long target_buf_size;
/*static*/ void
encode_actions (struct breakpoint *t, struct bp_location *tloc,
char ***tdp_actions, char ***stepping_actions);
/* The size to align memory write packets, when practical. The protocol
does not guarantee any alignment, and gdb will generate short
writes and unaligned writes, but even as a best-effort attempt this
can improve bulk transfers. For instance, if a write is misaligned
relative to the target's data bus, the stub may need to make an extra
round trip fetching data from the target. This doesn't make a
huge difference, but it's easy to do, so we try to be helpful.
The alignment chosen is arbitrary; usually data bus width is
important here, not the possibly larger cache line size. */
enum { REMOTE_ALIGN_WRITES = 16 };
/* Prototypes for local functions. */
static void cleanup_sigint_signal_handler (void *dummy);
static void initialize_sigint_signal_handler (void);
static int getpkt_sane (char **buf, long *sizeof_buf, int forever);
static int getpkt_or_notif_sane (char **buf, long *sizeof_buf,
int forever);
static void handle_remote_sigint (int);
static void handle_remote_sigint_twice (int);
static void async_remote_interrupt (gdb_client_data);
void async_remote_interrupt_twice (gdb_client_data);
static void remote_files_info (struct target_ops *ignore);
static void remote_prepare_to_store (struct regcache *regcache);
static void remote_open (char *name, int from_tty);
static void extended_remote_open (char *name, int from_tty);
static void remote_open_1 (char *, int, struct target_ops *, int extended_p);
static void remote_close (int quitting);
static void remote_mourn (struct target_ops *ops);
static void extended_remote_restart (void);
static void extended_remote_mourn (struct target_ops *);
static void remote_mourn_1 (struct target_ops *);
static void remote_send (char **buf, long *sizeof_buf_p);
static int readchar (int timeout);
static void remote_kill (struct target_ops *ops);
static int tohex (int nib);
static int remote_can_async_p (void);
static int remote_is_async_p (void);
static void remote_async (void (*callback) (enum inferior_event_type event_type,
void *context), void *context);
static void remote_detach (struct target_ops *ops, char *args, int from_tty);
static void remote_interrupt (int signo);
static void remote_interrupt_twice (int signo);
static void interrupt_query (void);
static void set_general_thread (struct ptid ptid);
static void set_continue_thread (struct ptid ptid);
static void get_offsets (void);
static void skip_frame (void);
static long read_frame (char **buf_p, long *sizeof_buf);
static int hexnumlen (ULONGEST num);
static void init_remote_ops (void);
static void init_extended_remote_ops (void);
static void remote_stop (ptid_t);
static int ishex (int ch, int *val);
static int stubhex (int ch);
static int hexnumstr (char *, ULONGEST);
static int hexnumnstr (char *, ULONGEST, int);
static CORE_ADDR remote_address_masked (CORE_ADDR);
static void print_packet (char *);
static void compare_sections_command (char *, int);
static void packet_command (char *, int);
static int stub_unpack_int (char *buff, int fieldlength);
static ptid_t remote_current_thread (ptid_t oldptid);
static void remote_find_new_threads (void);
static void record_currthread (ptid_t currthread);
static int fromhex (int a);
extern int hex2bin (const char *hex, gdb_byte *bin, int count);
extern int bin2hex (const gdb_byte *bin, char *hex, int count);
static int putpkt_binary (char *buf, int cnt);
static void check_binary_download (CORE_ADDR addr);
struct packet_config;
static void show_packet_config_cmd (struct packet_config *config);
static void update_packet_config (struct packet_config *config);
static void set_remote_protocol_packet_cmd (char *args, int from_tty,
struct cmd_list_element *c);
static void show_remote_protocol_packet_cmd (struct ui_file *file,
int from_tty,
struct cmd_list_element *c,
const char *value);
static char *write_ptid (char *buf, const char *endbuf, ptid_t ptid);
static ptid_t read_ptid (char *buf, char **obuf);
static void remote_set_permissions (void);
struct remote_state;
static int remote_get_trace_status (struct trace_status *ts);
static int remote_upload_tracepoints (struct uploaded_tp **utpp);
static int remote_upload_trace_state_variables (struct uploaded_tsv **utsvp);
static void remote_query_supported (void);
static void remote_check_symbols (struct objfile *objfile);
void _initialize_remote (void);
struct stop_reply;
static struct stop_reply *stop_reply_xmalloc (void);
static void stop_reply_xfree (struct stop_reply *);
static void do_stop_reply_xfree (void *arg);
static void remote_parse_stop_reply (char *buf, struct stop_reply *);
static void push_stop_reply (struct stop_reply *);
static void remote_get_pending_stop_replies (void);
static void discard_pending_stop_replies (int pid);
static int peek_stop_reply (ptid_t ptid);
static void remote_async_inferior_event_handler (gdb_client_data);
static void remote_async_get_pending_events_handler (gdb_client_data);
static void remote_terminal_ours (void);
static int remote_read_description_p (struct target_ops *target);
static void remote_console_output (char *msg);
/* The non-stop remote protocol provisions for one pending stop reply.
This is where we keep it until it is acknowledged. */
static struct stop_reply *pending_stop_reply = NULL;
/* For "remote". */
static struct cmd_list_element *remote_cmdlist;
/* For "set remote" and "show remote". */
static struct cmd_list_element *remote_set_cmdlist;
static struct cmd_list_element *remote_show_cmdlist;
/* Description of the remote protocol state for the currently
connected target. This is per-target state, and independent of the
selected architecture. */
struct remote_state
{
/* A buffer to use for incoming packets, and its current size. The
buffer is grown dynamically for larger incoming packets.
Outgoing packets may also be constructed in this buffer.
BUF_SIZE is always at least REMOTE_PACKET_SIZE;
REMOTE_PACKET_SIZE should be used to limit the length of outgoing
packets. */
char *buf;
long buf_size;
/* If we negotiated packet size explicitly (and thus can bypass
heuristics for the largest packet size that will not overflow
a buffer in the stub), this will be set to that packet size.
Otherwise zero, meaning to use the guessed size. */
long explicit_packet_size;
/* remote_wait is normally called when the target is running and
waits for a stop reply packet. But sometimes we need to call it
when the target is already stopped. We can send a "?" packet
and have remote_wait read the response. Or, if we already have
the response, we can stash it in BUF and tell remote_wait to
skip calling getpkt. This flag is set when BUF contains a
stop reply packet and the target is not waiting. */
int cached_wait_status;
/* True, if in no ack mode. That is, neither GDB nor the stub will
expect acks from each other. The connection is assumed to be
reliable. */
int noack_mode;
/* True if we're connected in extended remote mode. */
int extended;
/* True if the stub reported support for multi-process
extensions. */
int multi_process_aware;
/* True if we resumed the target and we're waiting for the target to
stop. In the mean time, we can't start another command/query.
The remote server wouldn't be ready to process it, so we'd
timeout waiting for a reply that would never come and eventually
we'd close the connection. This can happen in asynchronous mode
because we allow GDB commands while the target is running. */
int waiting_for_stop_reply;
/* True if the stub reports support for non-stop mode. */
int non_stop_aware;
/* True if the stub reports support for vCont;t. */
int support_vCont_t;
/* True if the stub reports support for conditional tracepoints. */
int cond_tracepoints;
/* True if the stub reports support for fast tracepoints. */
int fast_tracepoints;
/* True if the stub reports support for static tracepoints. */
int static_tracepoints;
/* True if the stub reports support for installing tracepoint while
tracing. */
int install_in_trace;
/* True if the stub can continue running a trace while GDB is
disconnected. */
int disconnected_tracing;
/* True if the stub reports support for enabling and disabling
tracepoints while a trace experiment is running. */
int enable_disable_tracepoints;
/* True if the stub can collect strings using tracenz bytecode. */
int string_tracing;
/* Nonzero if the user has pressed Ctrl-C, but the target hasn't
responded to that. */
int ctrlc_pending_p;
};
/* Private data that we'll store in (struct thread_info)->private. */
struct private_thread_info
{
char *extra;
int core;
};
static void
free_private_thread_info (struct private_thread_info *info)
{
xfree (info->extra);
xfree (info);
}
/* Returns true if the multi-process extensions are in effect. */
static int
remote_multi_process_p (struct remote_state *rs)
{
return rs->extended && rs->multi_process_aware;
}
/* This data could be associated with a target, but we do not always
have access to the current target when we need it, so for now it is
static. This will be fine for as long as only one target is in use
at a time. */
static struct remote_state remote_state;
static struct remote_state *
get_remote_state_raw (void)
{
return &remote_state;
}
/* Description of the remote protocol for a given architecture. */
struct packet_reg
{
long offset; /* Offset into G packet. */
long regnum; /* GDB's internal register number. */
LONGEST pnum; /* Remote protocol register number. */
int in_g_packet; /* Always part of G packet. */
/* long size in bytes; == register_size (target_gdbarch, regnum);
at present. */
/* char *name; == gdbarch_register_name (target_gdbarch, regnum);
at present. */
};
struct remote_arch_state
{
/* Description of the remote protocol registers. */
long sizeof_g_packet;
/* Description of the remote protocol registers indexed by REGNUM
(making an array gdbarch_num_regs in size). */
struct packet_reg *regs;
/* This is the size (in chars) of the first response to the ``g''
packet. It is used as a heuristic when determining the maximum
size of memory-read and memory-write packets. A target will
typically only reserve a buffer large enough to hold the ``g''
packet. The size does not include packet overhead (headers and
trailers). */
long actual_register_packet_size;
/* This is the maximum size (in chars) of a non read/write packet.
It is also used as a cap on the size of read/write packets. */
long remote_packet_size;
};
long sizeof_pkt = 2000;
/* Utility: generate error from an incoming stub packet. */
static void
trace_error (char *buf)
{
if (*buf++ != 'E')
return; /* not an error msg */
switch (*buf)
{
case '1': /* malformed packet error */
if (*++buf == '0') /* general case: */
error (_("remote.c: error in outgoing packet."));
else
error (_("remote.c: error in outgoing packet at field #%ld."),
strtol (buf, NULL, 16));
case '2':
error (_("trace API error 0x%s."), ++buf);
default:
error (_("Target returns error code '%s'."), buf);
}
}
/* Utility: wait for reply from stub, while accepting "O" packets. */
static char *
remote_get_noisy_reply (char **buf_p,
long *sizeof_buf)
{
do /* Loop on reply from remote stub. */
{
char *buf;
QUIT; /* Allow user to bail out with ^C. */
getpkt (buf_p, sizeof_buf, 0);
buf = *buf_p;
if (buf[0] == 'E')
trace_error (buf);
else if (strncmp (buf, "qRelocInsn:", strlen ("qRelocInsn:")) == 0)
{
ULONGEST ul;
CORE_ADDR from, to, org_to;
char *p, *pp;
int adjusted_size = 0;
volatile struct gdb_exception ex;
p = buf + strlen ("qRelocInsn:");
pp = unpack_varlen_hex (p, &ul);
if (*pp != ';')
error (_("invalid qRelocInsn packet: %s"), buf);
from = ul;
p = pp + 1;
unpack_varlen_hex (p, &ul);
to = ul;
org_to = to;
TRY_CATCH (ex, RETURN_MASK_ALL)
{
gdbarch_relocate_instruction (target_gdbarch, &to, from);
}
if (ex.reason >= 0)
{
adjusted_size = to - org_to;
sprintf (buf, "qRelocInsn:%x", adjusted_size);
putpkt (buf);
}
else if (ex.reason < 0 && ex.error == MEMORY_ERROR)
{
/* Propagate memory errors silently back to the target.
The stub may have limited the range of addresses we
can write to, for example. */
putpkt ("E01");
}
else
{
/* Something unexpectedly bad happened. Be verbose so
we can tell what, and propagate the error back to the
stub, so it doesn't get stuck waiting for a
response. */
exception_fprintf (gdb_stderr, ex,
_("warning: relocating instruction: "));
putpkt ("E01");
}
}
else if (buf[0] == 'O' && buf[1] != 'K')
remote_console_output (buf + 1); /* 'O' message from stub */
else
return buf; /* Here's the actual reply. */
}
while (1);
}
/* Handle for retreving the remote protocol data from gdbarch. */
static struct gdbarch_data *remote_gdbarch_data_handle;
static struct remote_arch_state *
get_remote_arch_state (void)
{
return gdbarch_data (target_gdbarch, remote_gdbarch_data_handle);
}
/* Fetch the global remote target state. */
static struct remote_state *
get_remote_state (void)
{
/* Make sure that the remote architecture state has been
initialized, because doing so might reallocate rs->buf. Any
function which calls getpkt also needs to be mindful of changes
to rs->buf, but this call limits the number of places which run
into trouble. */
get_remote_arch_state ();
return get_remote_state_raw ();
}
static int
compare_pnums (const void *lhs_, const void *rhs_)
{
const struct packet_reg * const *lhs = lhs_;
const struct packet_reg * const *rhs = rhs_;
if ((*lhs)->pnum < (*rhs)->pnum)
return -1;
else if ((*lhs)->pnum == (*rhs)->pnum)
return 0;
else
return 1;
}
static int
map_regcache_remote_table (struct gdbarch *gdbarch, struct packet_reg *regs)
{
int regnum, num_remote_regs, offset;
struct packet_reg **remote_regs;
for (regnum = 0; regnum < gdbarch_num_regs (gdbarch); regnum++)
{
struct packet_reg *r = &regs[regnum];
if (register_size (gdbarch, regnum) == 0)
/* Do not try to fetch zero-sized (placeholder) registers. */
r->pnum = -1;
else
r->pnum = gdbarch_remote_register_number (gdbarch, regnum);
r->regnum = regnum;
}
/* Define the g/G packet format as the contents of each register
with a remote protocol number, in order of ascending protocol
number. */
remote_regs = alloca (gdbarch_num_regs (gdbarch)
* sizeof (struct packet_reg *));
for (num_remote_regs = 0, regnum = 0;
regnum < gdbarch_num_regs (gdbarch);
regnum++)
if (regs[regnum].pnum != -1)
remote_regs[num_remote_regs++] = &regs[regnum];
qsort (remote_regs, num_remote_regs, sizeof (struct packet_reg *),
compare_pnums);
for (regnum = 0, offset = 0; regnum < num_remote_regs; regnum++)
{
remote_regs[regnum]->in_g_packet = 1;
remote_regs[regnum]->offset = offset;
offset += register_size (gdbarch, remote_regs[regnum]->regnum);
}
return offset;
}
/* Given the architecture described by GDBARCH, return the remote
protocol register's number and the register's offset in the g/G
packets of GDB register REGNUM, in PNUM and POFFSET respectively.
If the target does not have a mapping for REGNUM, return false,
otherwise, return true. */
int
remote_register_number_and_offset (struct gdbarch *gdbarch, int regnum,
int *pnum, int *poffset)
{
int sizeof_g_packet;
struct packet_reg *regs;
struct cleanup *old_chain;
gdb_assert (regnum < gdbarch_num_regs (gdbarch));
regs = xcalloc (gdbarch_num_regs (gdbarch), sizeof (struct packet_reg));
old_chain = make_cleanup (xfree, regs);
sizeof_g_packet = map_regcache_remote_table (gdbarch, regs);
*pnum = regs[regnum].pnum;
*poffset = regs[regnum].offset;
do_cleanups (old_chain);
return *pnum != -1;
}
static void *
init_remote_state (struct gdbarch *gdbarch)
{
struct remote_state *rs = get_remote_state_raw ();
struct remote_arch_state *rsa;
rsa = GDBARCH_OBSTACK_ZALLOC (gdbarch, struct remote_arch_state);
/* Use the architecture to build a regnum<->pnum table, which will be
1:1 unless a feature set specifies otherwise. */
rsa->regs = GDBARCH_OBSTACK_CALLOC (gdbarch,
gdbarch_num_regs (gdbarch),
struct packet_reg);
/* Record the maximum possible size of the g packet - it may turn out
to be smaller. */
rsa->sizeof_g_packet = map_regcache_remote_table (gdbarch, rsa->regs);
/* Default maximum number of characters in a packet body. Many
remote stubs have a hardwired buffer size of 400 bytes
(c.f. BUFMAX in m68k-stub.c and i386-stub.c). BUFMAX-1 is used
as the maximum packet-size to ensure that the packet and an extra
NUL character can always fit in the buffer. This stops GDB
trashing stubs that try to squeeze an extra NUL into what is
already a full buffer (As of 1999-12-04 that was most stubs). */
rsa->remote_packet_size = 400 - 1;
/* This one is filled in when a ``g'' packet is received. */
rsa->actual_register_packet_size = 0;
/* Should rsa->sizeof_g_packet needs more space than the
default, adjust the size accordingly. Remember that each byte is
encoded as two characters. 32 is the overhead for the packet
header / footer. NOTE: cagney/1999-10-26: I suspect that 8
(``$NN:G...#NN'') is a better guess, the below has been padded a
little. */
if (rsa->sizeof_g_packet > ((rsa->remote_packet_size - 32) / 2))
rsa->remote_packet_size = (rsa->sizeof_g_packet * 2 + 32);
/* Make sure that the packet buffer is plenty big enough for
this architecture. */
if (rs->buf_size < rsa->remote_packet_size)
{
rs->buf_size = 2 * rsa->remote_packet_size;
rs->buf = xrealloc (rs->buf, rs->buf_size);
}
return rsa;
}
/* Return the current allowed size of a remote packet. This is
inferred from the current architecture, and should be used to
limit the length of outgoing packets. */
static long
get_remote_packet_size (void)
{
struct remote_state *rs = get_remote_state ();
struct remote_arch_state *rsa = get_remote_arch_state ();
if (rs->explicit_packet_size)
return rs->explicit_packet_size;
return rsa->remote_packet_size;
}
static struct packet_reg *
packet_reg_from_regnum (struct remote_arch_state *rsa, long regnum)
{
if (regnum < 0 && regnum >= gdbarch_num_regs (target_gdbarch))
return NULL;
else
{
struct packet_reg *r = &rsa->regs[regnum];
gdb_assert (r->regnum == regnum);
return r;
}
}
static struct packet_reg *
packet_reg_from_pnum (struct remote_arch_state *rsa, LONGEST pnum)
{
int i;
for (i = 0; i < gdbarch_num_regs (target_gdbarch); i++)
{
struct packet_reg *r = &rsa->regs[i];
if (r->pnum == pnum)
return r;
}
return NULL;
}
/* FIXME: graces/2002-08-08: These variables should eventually be
bound to an instance of the target object (as in gdbarch-tdep()),
when such a thing exists. */
/* This is set to the data address of the access causing the target
to stop for a watchpoint. */
static CORE_ADDR remote_watch_data_address;
/* This is non-zero if target stopped for a watchpoint. */
static int remote_stopped_by_watchpoint_p;
static struct target_ops remote_ops;
static struct target_ops extended_remote_ops;
/* FIXME: cagney/1999-09-23: Even though getpkt was called with
``forever'' still use the normal timeout mechanism. This is
currently used by the ASYNC code to guarentee that target reads
during the initial connect always time-out. Once getpkt has been
modified to return a timeout indication and, in turn
remote_wait()/wait_for_inferior() have gained a timeout parameter
this can go away. */
static int wait_forever_enabled_p = 1;
/* Allow the user to specify what sequence to send to the remote
when he requests a program interruption: Although ^C is usually
what remote systems expect (this is the default, here), it is
sometimes preferable to send a break. On other systems such
as the Linux kernel, a break followed by g, which is Magic SysRq g
is required in order to interrupt the execution. */
const char interrupt_sequence_control_c[] = "Ctrl-C";
const char interrupt_sequence_break[] = "BREAK";
const char interrupt_sequence_break_g[] = "BREAK-g";
static const char *interrupt_sequence_modes[] =
{
interrupt_sequence_control_c,
interrupt_sequence_break,
interrupt_sequence_break_g,
NULL
};
static const char *interrupt_sequence_mode = interrupt_sequence_control_c;
static void
show_interrupt_sequence (struct ui_file *file, int from_tty,
struct cmd_list_element *c,
const char *value)
{
if (interrupt_sequence_mode == interrupt_sequence_control_c)
fprintf_filtered (file,
_("Send the ASCII ETX character (Ctrl-c) "
"to the remote target to interrupt the "
"execution of the program.\n"));
else if (interrupt_sequence_mode == interrupt_sequence_break)
fprintf_filtered (file,
_("send a break signal to the remote target "
"to interrupt the execution of the program.\n"));
else if (interrupt_sequence_mode == interrupt_sequence_break_g)
fprintf_filtered (file,
_("Send a break signal and 'g' a.k.a. Magic SysRq g to "
"the remote target to interrupt the execution "
"of Linux kernel.\n"));
else
internal_error (__FILE__, __LINE__,
_("Invalid value for interrupt_sequence_mode: %s."),
interrupt_sequence_mode);
}
/* This boolean variable specifies whether interrupt_sequence is sent
to the remote target when gdb connects to it.
This is mostly needed when you debug the Linux kernel: The Linux kernel
expects BREAK g which is Magic SysRq g for connecting gdb. */
static int interrupt_on_connect = 0;
/* This variable is used to implement the "set/show remotebreak" commands.
Since these commands are now deprecated in favor of "set/show remote
interrupt-sequence", it no longer has any effect on the code. */
static int remote_break;
static void
set_remotebreak (char *args, int from_tty, struct cmd_list_element *c)
{
if (remote_break)
interrupt_sequence_mode = interrupt_sequence_break;
else
interrupt_sequence_mode = interrupt_sequence_control_c;
}
static void
show_remotebreak (struct ui_file *file, int from_tty,
struct cmd_list_element *c,
const char *value)
{
}
/* Descriptor for I/O to remote machine. Initialize it to NULL so that
remote_open knows that we don't have a file open when the program
starts. */
static struct serial *remote_desc = NULL;
/* This variable sets the number of bits in an address that are to be
sent in a memory ("M" or "m") packet. Normally, after stripping
leading zeros, the entire address would be sent. This variable
restricts the address to REMOTE_ADDRESS_SIZE bits. HISTORY: The
initial implementation of remote.c restricted the address sent in
memory packets to ``host::sizeof long'' bytes - (typically 32
bits). Consequently, for 64 bit targets, the upper 32 bits of an
address was never sent. Since fixing this bug may cause a break in
some remote targets this variable is principly provided to
facilitate backward compatibility. */
static int remote_address_size;
/* Temporary to track who currently owns the terminal. See
remote_terminal_* for more details. */
static int remote_async_terminal_ours_p;
/* The executable file to use for "run" on the remote side. */
static char *remote_exec_file = "";
/* User configurable variables for the number of characters in a
memory read/write packet. MIN (rsa->remote_packet_size,
rsa->sizeof_g_packet) is the default. Some targets need smaller
values (fifo overruns, et.al.) and some users need larger values
(speed up transfers). The variables ``preferred_*'' (the user
request), ``current_*'' (what was actually set) and ``forced_*''
(Positive - a soft limit, negative - a hard limit). */
struct memory_packet_config
{
char *name;
long size;
int fixed_p;
};
/* Compute the current size of a read/write packet. Since this makes
use of ``actual_register_packet_size'' the computation is dynamic. */
static long
get_memory_packet_size (struct memory_packet_config *config)
{
struct remote_state *rs = get_remote_state ();
struct remote_arch_state *rsa = get_remote_arch_state ();
/* NOTE: The somewhat arbitrary 16k comes from the knowledge (folk
law?) that some hosts don't cope very well with large alloca()
calls. Eventually the alloca() code will be replaced by calls to
xmalloc() and make_cleanups() allowing this restriction to either
be lifted or removed. */
#ifndef MAX_REMOTE_PACKET_SIZE
#define MAX_REMOTE_PACKET_SIZE 16384
#endif
/* NOTE: 20 ensures we can write at least one byte. */
#ifndef MIN_REMOTE_PACKET_SIZE
#define MIN_REMOTE_PACKET_SIZE 20
#endif
long what_they_get;
if (config->fixed_p)
{
if (config->size <= 0)
what_they_get = MAX_REMOTE_PACKET_SIZE;
else
what_they_get = config->size;
}
else
{
what_they_get = get_remote_packet_size ();
/* Limit the packet to the size specified by the user. */
if (config->size > 0
&& what_they_get > config->size)
what_they_get = config->size;
/* Limit it to the size of the targets ``g'' response unless we have
permission from the stub to use a larger packet size. */
if (rs->explicit_packet_size == 0
&& rsa->actual_register_packet_size > 0
&& what_they_get > rsa->actual_register_packet_size)
what_they_get = rsa->actual_register_packet_size;
}
if (what_they_get > MAX_REMOTE_PACKET_SIZE)
what_they_get = MAX_REMOTE_PACKET_SIZE;
if (what_they_get < MIN_REMOTE_PACKET_SIZE)
what_they_get = MIN_REMOTE_PACKET_SIZE;
/* Make sure there is room in the global buffer for this packet
(including its trailing NUL byte). */
if (rs->buf_size < what_they_get + 1)
{
rs->buf_size = 2 * what_they_get;
rs->buf = xrealloc (rs->buf, 2 * what_they_get);
}
return what_they_get;
}
/* Update the size of a read/write packet. If they user wants
something really big then do a sanity check. */
static void
set_memory_packet_size (char *args, struct memory_packet_config *config)
{
int fixed_p = config->fixed_p;
long size = config->size;
if (args == NULL)
error (_("Argument required (integer, `fixed' or `limited')."));
else if (strcmp (args, "hard") == 0
|| strcmp (args, "fixed") == 0)
fixed_p = 1;
else if (strcmp (args, "soft") == 0
|| strcmp (args, "limit") == 0)
fixed_p = 0;
else
{
char *end;
size = strtoul (args, &end, 0);
if (args == end)
error (_("Invalid %s (bad syntax)."), config->name);
#if 0
/* Instead of explicitly capping the size of a packet to
MAX_REMOTE_PACKET_SIZE or dissallowing it, the user is
instead allowed to set the size to something arbitrarily
large. */
if (size > MAX_REMOTE_PACKET_SIZE)
error (_("Invalid %s (too large)."), config->name);
#endif
}
/* Extra checks? */
if (fixed_p && !config->fixed_p)
{
if (! query (_("The target may not be able to correctly handle a %s\n"
"of %ld bytes. Change the packet size? "),
config->name, size))
error (_("Packet size not changed."));
}
/* Update the config. */
config->fixed_p = fixed_p;
config->size = size;
}
static void
show_memory_packet_size (struct memory_packet_config *config)
{
printf_filtered (_("The %s is %ld. "), config->name, config->size);
if (config->fixed_p)
printf_filtered (_("Packets are fixed at %ld bytes.\n"),
get_memory_packet_size (config));
else
printf_filtered (_("Packets are limited to %ld bytes.\n"),
get_memory_packet_size (config));
}
static struct memory_packet_config memory_write_packet_config =
{
"memory-write-packet-size",
};
static void
set_memory_write_packet_size (char *args, int from_tty)
{
set_memory_packet_size (args, &memory_write_packet_config);
}
static void
show_memory_write_packet_size (char *args, int from_tty)
{
show_memory_packet_size (&memory_write_packet_config);
}
static long
get_memory_write_packet_size (void)
{
return get_memory_packet_size (&memory_write_packet_config);
}
static struct memory_packet_config memory_read_packet_config =
{
"memory-read-packet-size",
};
static void
set_memory_read_packet_size (char *args, int from_tty)
{
set_memory_packet_size (args, &memory_read_packet_config);
}
static void
show_memory_read_packet_size (char *args, int from_tty)
{
show_memory_packet_size (&memory_read_packet_config);
}
static long
get_memory_read_packet_size (void)
{
long size = get_memory_packet_size (&memory_read_packet_config);
/* FIXME: cagney/1999-11-07: Functions like getpkt() need to get an
extra buffer size argument before the memory read size can be
increased beyond this. */
if (size > get_remote_packet_size ())
size = get_remote_packet_size ();
return size;
}
/* Generic configuration support for packets the stub optionally
supports. Allows the user to specify the use of the packet as well
as allowing GDB to auto-detect support in the remote stub. */
enum packet_support
{
PACKET_SUPPORT_UNKNOWN = 0,
PACKET_ENABLE,
PACKET_DISABLE
};
struct packet_config
{
const char *name;
const char *title;
enum auto_boolean detect;
enum packet_support support;
};
/* Analyze a packet's return value and update the packet config
accordingly. */
enum packet_result
{
PACKET_ERROR,
PACKET_OK,
PACKET_UNKNOWN
};
static void
update_packet_config (struct packet_config *config)
{
switch (config->detect)
{
case AUTO_BOOLEAN_TRUE:
config->support = PACKET_ENABLE;
break;
case AUTO_BOOLEAN_FALSE:
config->support = PACKET_DISABLE;
break;
case AUTO_BOOLEAN_AUTO:
config->support = PACKET_SUPPORT_UNKNOWN;
break;
}
}
static void
show_packet_config_cmd (struct packet_config *config)
{
char *support = "internal-error";
switch (config->support)
{
case PACKET_ENABLE:
support = "enabled";
break;
case PACKET_DISABLE:
support = "disabled";
break;
case PACKET_SUPPORT_UNKNOWN:
support = "unknown";
break;
}
switch (config->detect)
{
case AUTO_BOOLEAN_AUTO:
printf_filtered (_("Support for the `%s' packet "
"is auto-detected, currently %s.\n"),
config->name, support);
break;
case AUTO_BOOLEAN_TRUE:
case AUTO_BOOLEAN_FALSE:
printf_filtered (_("Support for the `%s' packet is currently %s.\n"),
config->name, support);
break;
}
}
static void
add_packet_config_cmd (struct packet_config *config, const char *name,
const char *title, int legacy)
{
char *set_doc;
char *show_doc;
char *cmd_name;
config->name = name;
config->title = title;
config->detect = AUTO_BOOLEAN_AUTO;
config->support = PACKET_SUPPORT_UNKNOWN;
set_doc = xstrprintf ("Set use of remote protocol `%s' (%s) packet",
name, title);
show_doc = xstrprintf ("Show current use of remote "
"protocol `%s' (%s) packet",
name, title);
/* set/show TITLE-packet {auto,on,off} */
cmd_name = xstrprintf ("%s-packet", title);
add_setshow_auto_boolean_cmd (cmd_name, class_obscure,
&config->detect, set_doc,
show_doc, NULL, /* help_doc */
set_remote_protocol_packet_cmd,
show_remote_protocol_packet_cmd,
&remote_set_cmdlist, &remote_show_cmdlist);
/* The command code copies the documentation strings. */
xfree (set_doc);
xfree (show_doc);
/* set/show remote NAME-packet {auto,on,off} -- legacy. */
if (legacy)
{
char *legacy_name;
legacy_name = xstrprintf ("%s-packet", name);
add_alias_cmd (legacy_name, cmd_name, class_obscure, 0,
&remote_set_cmdlist);
add_alias_cmd (legacy_name, cmd_name, class_obscure, 0,
&remote_show_cmdlist);
}
}
static enum packet_result
packet_check_result (const char *buf)
{
if (buf[0] != '\0')
{
/* The stub recognized the packet request. Check that the
operation succeeded. */
if (buf[0] == 'E'
&& isxdigit (buf[1]) && isxdigit (buf[2])
&& buf[3] == '\0')
/* "Enn" - definitly an error. */
return PACKET_ERROR;
/* Always treat "E." as an error. This will be used for
more verbose error messages, such as E.memtypes. */
if (buf[0] == 'E' && buf[1] == '.')
return PACKET_ERROR;
/* The packet may or may not be OK. Just assume it is. */
return PACKET_OK;
}
else
/* The stub does not support the packet. */
return PACKET_UNKNOWN;
}
static enum packet_result
packet_ok (const char *buf, struct packet_config *config)
{
enum packet_result result;
result = packet_check_result (buf);
switch (result)
{
case PACKET_OK:
case PACKET_ERROR:
/* The stub recognized the packet request. */
switch (config->support)
{
case PACKET_SUPPORT_UNKNOWN:
if (remote_debug)
fprintf_unfiltered (gdb_stdlog,
"Packet %s (%s) is supported\n",
config->name, config->title);
config->support = PACKET_ENABLE;
break;
case PACKET_DISABLE:
internal_error (__FILE__, __LINE__,
_("packet_ok: attempt to use a disabled packet"));
break;
case PACKET_ENABLE:
break;
}
break;
case PACKET_UNKNOWN:
/* The stub does not support the packet. */
switch (config->support)
{
case PACKET_ENABLE:
if (config->detect == AUTO_BOOLEAN_AUTO)
/* If the stub previously indicated that the packet was
supported then there is a protocol error.. */
error (_("Protocol error: %s (%s) conflicting enabled responses."),
config->name, config->title);
else
/* The user set it wrong. */
error (_("Enabled packet %s (%s) not recognized by stub"),
config->name, config->title);
break;
case PACKET_SUPPORT_UNKNOWN:
if (remote_debug)
fprintf_unfiltered (gdb_stdlog,
"Packet %s (%s) is NOT supported\n",
config->name, config->title);
config->support = PACKET_DISABLE;
break;
case PACKET_DISABLE:
break;
}
break;
}
return result;
}
enum {
PACKET_vCont = 0,
PACKET_X,
PACKET_qSymbol,
PACKET_P,
PACKET_p,
PACKET_Z0,
PACKET_Z1,
PACKET_Z2,
PACKET_Z3,
PACKET_Z4,
PACKET_vFile_open,
PACKET_vFile_pread,
PACKET_vFile_pwrite,
PACKET_vFile_close,
PACKET_vFile_unlink,
PACKET_qXfer_auxv,
PACKET_qXfer_features,
PACKET_qXfer_libraries,
PACKET_qXfer_libraries_svr4,
PACKET_qXfer_memory_map,
PACKET_qXfer_spu_read,
PACKET_qXfer_spu_write,
PACKET_qXfer_osdata,
PACKET_qXfer_threads,
PACKET_qXfer_statictrace_read,
PACKET_qXfer_traceframe_info,
PACKET_qGetTIBAddr,
PACKET_qGetTLSAddr,
PACKET_qSupported,
PACKET_QPassSignals,
PACKET_qSearch_memory,
PACKET_vAttach,
PACKET_vRun,
PACKET_QStartNoAckMode,
PACKET_vKill,
PACKET_qXfer_siginfo_read,
PACKET_qXfer_siginfo_write,
PACKET_qAttached,
PACKET_ConditionalTracepoints,
PACKET_FastTracepoints,
PACKET_StaticTracepoints,
PACKET_InstallInTrace,
PACKET_bc,
PACKET_bs,
PACKET_TracepointSource,
PACKET_QAllow,
PACKET_qXfer_fdpic,
PACKET_QDisableRandomization,
PACKET_MAX
};
static struct packet_config remote_protocol_packets[PACKET_MAX];
static void
set_remote_protocol_packet_cmd (char *args, int from_tty,
struct cmd_list_element *c)
{
struct packet_config *packet;
for (packet = remote_protocol_packets;
packet < &remote_protocol_packets[PACKET_MAX];
packet++)
{
if (&packet->detect == c->var)
{
update_packet_config (packet);
return;
}
}
internal_error (__FILE__, __LINE__, _("Could not find config for %s"),
c->name);
}
static void
show_remote_protocol_packet_cmd (struct ui_file *file, int from_tty,
struct cmd_list_element *c,
const char *value)
{
struct packet_config *packet;
for (packet = remote_protocol_packets;
packet < &remote_protocol_packets[PACKET_MAX];
packet++)
{
if (&packet->detect == c->var)
{
show_packet_config_cmd (packet);
return;
}
}
internal_error (__FILE__, __LINE__, _("Could not find config for %s"),
c->name);
}
/* Should we try one of the 'Z' requests? */
enum Z_packet_type
{
Z_PACKET_SOFTWARE_BP,
Z_PACKET_HARDWARE_BP,
Z_PACKET_WRITE_WP,
Z_PACKET_READ_WP,
Z_PACKET_ACCESS_WP,
NR_Z_PACKET_TYPES
};
/* For compatibility with older distributions. Provide a ``set remote
Z-packet ...'' command that updates all the Z packet types. */
static enum auto_boolean remote_Z_packet_detect;
static void
set_remote_protocol_Z_packet_cmd (char *args, int from_tty,
struct cmd_list_element *c)
{
int i;
for (i = 0; i < NR_Z_PACKET_TYPES; i++)
{
remote_protocol_packets[PACKET_Z0 + i].detect = remote_Z_packet_detect;
update_packet_config (&remote_protocol_packets[PACKET_Z0 + i]);
}
}
static void
show_remote_protocol_Z_packet_cmd (struct ui_file *file, int from_tty,
struct cmd_list_element *c,
const char *value)
{
int i;
for (i = 0; i < NR_Z_PACKET_TYPES; i++)
{
show_packet_config_cmd (&remote_protocol_packets[PACKET_Z0 + i]);
}
}
/* Should we try the 'ThreadInfo' query packet?
This variable (NOT available to the user: auto-detect only!)
determines whether GDB will use the new, simpler "ThreadInfo"
query or the older, more complex syntax for thread queries.
This is an auto-detect variable (set to true at each connect,
and set to false when the target fails to recognize it). */
static int use_threadinfo_query;
static int use_threadextra_query;
/* Tokens for use by the asynchronous signal handlers for SIGINT. */
static struct async_signal_handler *sigint_remote_twice_token;
static struct async_signal_handler *sigint_remote_token;
/* Asynchronous signal handle registered as event loop source for
when we have pending events ready to be passed to the core. */
static struct async_event_handler *remote_async_inferior_event_token;
/* Asynchronous signal handle registered as event loop source for when
the remote sent us a %Stop notification. The registered callback
will do a vStopped sequence to pull the rest of the events out of
the remote side into our event queue. */
static struct async_event_handler *remote_async_get_pending_events_token;
static ptid_t magic_null_ptid;
static ptid_t not_sent_ptid;
static ptid_t any_thread_ptid;
/* These are the threads which we last sent to the remote system. The
TID member will be -1 for all or -2 for not sent yet. */
static ptid_t general_thread;
static ptid_t continue_thread;
/* This the traceframe which we last selected on the remote system.
It will be -1 if no traceframe is selected. */
static int remote_traceframe_number = -1;
/* Find out if the stub attached to PID (and hence GDB should offer to
detach instead of killing it when bailing out). */
static int
remote_query_attached (int pid)
{
struct remote_state *rs = get_remote_state ();
if (remote_protocol_packets[PACKET_qAttached].support == PACKET_DISABLE)
return 0;
if (remote_multi_process_p (rs))
sprintf (rs->buf, "qAttached:%x", pid);
else
sprintf (rs->buf, "qAttached");
putpkt (rs->buf);
getpkt (&rs->buf, &rs->buf_size, 0);
switch (packet_ok (rs->buf,
&remote_protocol_packets[PACKET_qAttached]))
{
case PACKET_OK:
if (strcmp (rs->buf, "1") == 0)
return 1;
break;
case PACKET_ERROR:
warning (_("Remote failure reply: %s"), rs->buf);
break;
case PACKET_UNKNOWN:
break;
}
return 0;
}
/* Add PID to GDB's inferior table. Since we can be connected to a
remote system before before knowing about any inferior, mark the
target with execution when we find the first inferior. If ATTACHED
is 1, then we had just attached to this inferior. If it is 0, then
we just created this inferior. If it is -1, then try querying the
remote stub to find out if it had attached to the inferior or
not. */
static struct inferior *
remote_add_inferior (int pid, int attached)
{
struct inferior *inf;
/* Check whether this process we're learning about is to be
considered attached, or if is to be considered to have been
spawned by the stub. */
if (attached == -1)
attached = remote_query_attached (pid);
if (gdbarch_has_global_solist (target_gdbarch))
{
/* If the target shares code across all inferiors, then every
attach adds a new inferior. */
inf = add_inferior (pid);
/* ... and every inferior is bound to the same program space.
However, each inferior may still have its own address
space. */
inf->aspace = maybe_new_address_space ();
inf->pspace = current_program_space;
}
else
{
/* In the traditional debugging scenario, there's a 1-1 match
between program/address spaces. We simply bind the inferior
to the program space's address space. */
inf = current_inferior ();
inferior_appeared (inf, pid);
}
inf->attach_flag = attached;
return inf;
}
/* Add thread PTID to GDB's thread list. Tag it as executing/running
according to RUNNING. */
static void
remote_add_thread (ptid_t ptid, int running)
{
add_thread (ptid);
set_executing (ptid, running);
set_running (ptid, running);
}
/* Come here when we learn about a thread id from the remote target.
It may be the first time we hear about such thread, so take the
opportunity to add it to GDB's thread list. In case this is the
first time we're noticing its corresponding inferior, add it to
GDB's inferior list as well. */
static void
remote_notice_new_inferior (ptid_t currthread, int running)
{
/* If this is a new thread, add it to GDB's thread list.
If we leave it up to WFI to do this, bad things will happen. */
if (in_thread_list (currthread) && is_exited (currthread))
{
/* We're seeing an event on a thread id we knew had exited.
This has to be a new thread reusing the old id. Add it. */
remote_add_thread (currthread, running);
return;
}
if (!in_thread_list (currthread))
{
struct inferior *inf = NULL;
int pid = ptid_get_pid (currthread);
if (ptid_is_pid (inferior_ptid)
&& pid == ptid_get_pid (inferior_ptid))
{
/* inferior_ptid has no thread member yet. This can happen
with the vAttach -> remote_wait,"TAAthread:" path if the
stub doesn't support qC. This is the first stop reported
after an attach, so this is the main thread. Update the
ptid in the thread list. */
if (in_thread_list (pid_to_ptid (pid)))
thread_change_ptid (inferior_ptid, currthread);
else
{
remote_add_thread (currthread, running);
inferior_ptid = currthread;
}
return;
}
if (ptid_equal (magic_null_ptid, inferior_ptid))
{
/* inferior_ptid is not set yet. This can happen with the
vRun -> remote_wait,"TAAthread:" path if the stub
doesn't support qC. This is the first stop reported
after an attach, so this is the main thread. Update the
ptid in the thread list. */
thread_change_ptid (inferior_ptid, currthread);
return;
}
/* When connecting to a target remote, or to a target
extended-remote which already was debugging an inferior, we
may not know about it yet. Add it before adding its child
thread, so notifications are emitted in a sensible order. */
if (!in_inferior_list (ptid_get_pid (currthread)))
inf = remote_add_inferior (ptid_get_pid (currthread), -1);
/* This is really a new thread. Add it. */
remote_add_thread (currthread, running);
/* If we found a new inferior, let the common code do whatever
it needs to with it (e.g., read shared libraries, insert
breakpoints). */
if (inf != NULL)
notice_new_inferior (currthread, running, 0);
}
}
/* Return the private thread data, creating it if necessary. */
struct private_thread_info *
demand_private_info (ptid_t ptid)
{
struct thread_info *info = find_thread_ptid (ptid);
gdb_assert (info);
if (!info->private)
{
info->private = xmalloc (sizeof (*(info->private)));
info->private_dtor = free_private_thread_info;
info->private->core = -1;
info->private->extra = 0;
}
return info->private;
}
/* Call this function as a result of
1) A halt indication (T packet) containing a thread id
2) A direct query of currthread
3) Successful execution of set thread */
static void
record_currthread (ptid_t currthread)
{
general_thread = currthread;
}
static char *last_pass_packet;
/* If 'QPassSignals' is supported, tell the remote stub what signals
it can simply pass through to the inferior without reporting. */
static void
remote_pass_signals (int numsigs, unsigned char *pass_signals)
{
if (remote_protocol_packets[PACKET_QPassSignals].support != PACKET_DISABLE)
{
char *pass_packet, *p;
int count = 0, i;
gdb_assert (numsigs < 256);
for (i = 0; i < numsigs; i++)
{
if (pass_signals[i])
count++;
}
pass_packet = xmalloc (count * 3 + strlen ("QPassSignals:") + 1);
strcpy (pass_packet, "QPassSignals:");
p = pass_packet + strlen (pass_packet);
for (i = 0; i < numsigs; i++)
{
if (pass_signals[i])
{
if (i >= 16)
*p++ = tohex (i >> 4);
*p++ = tohex (i & 15);
if (count)
*p++ = ';';
else
break;
count--;
}
}
*p = 0;
if (!last_pass_packet || strcmp (last_pass_packet, pass_packet))
{
struct remote_state *rs = get_remote_state ();
char *buf = rs->buf;
putpkt (pass_packet);
getpkt (&rs->buf, &rs->buf_size, 0);
packet_ok (buf, &remote_protocol_packets[PACKET_QPassSignals]);
if (last_pass_packet)
xfree (last_pass_packet);
last_pass_packet = pass_packet;
}
else
xfree (pass_packet);
}
}
/* If PTID is MAGIC_NULL_PTID, don't set any thread. If PTID is
MINUS_ONE_PTID, set the thread to -1, so the stub returns the
thread. If GEN is set, set the general thread, if not, then set
the step/continue thread. */
static void
set_thread (struct ptid ptid, int gen)
{
struct remote_state *rs = get_remote_state ();
ptid_t state = gen ? general_thread : continue_thread;
char *buf = rs->buf;
char *endbuf = rs->buf + get_remote_packet_size ();
if (ptid_equal (state, ptid))
return;
*buf++ = 'H';
*buf++ = gen ? 'g' : 'c';
if (ptid_equal (ptid, magic_null_ptid))
xsnprintf (buf, endbuf - buf, "0");
else if (ptid_equal (ptid, any_thread_ptid))
xsnprintf (buf, endbuf - buf, "0");
else if (ptid_equal (ptid, minus_one_ptid))
xsnprintf (buf, endbuf - buf, "-1");
else
write_ptid (buf, endbuf, ptid);
putpkt (rs->buf);
getpkt (&rs->buf, &rs->buf_size, 0);
if (gen)
general_thread = ptid;
else
continue_thread = ptid;
}
static void
set_general_thread (struct ptid ptid)
{
set_thread (ptid, 1);
}
static void
set_continue_thread (struct ptid ptid)
{
set_thread (ptid, 0);
}
/* Change the remote current process. Which thread within the process
ends up selected isn't important, as long as it is the same process
as what INFERIOR_PTID points to.
This comes from that fact that there is no explicit notion of
"selected process" in the protocol. The selected process for
general operations is the process the selected general thread
belongs to. */
static void
set_general_process (void)
{
struct remote_state *rs = get_remote_state ();
/* If the remote can't handle multiple processes, don't bother. */
if (!remote_multi_process_p (rs))
return;
/* We only need to change the remote current thread if it's pointing
at some other process. */
if (ptid_get_pid (general_thread) != ptid_get_pid (inferior_ptid))
set_general_thread (inferior_ptid);
}
/* Return nonzero if the thread PTID is still alive on the remote
system. */
static int
remote_thread_alive (struct target_ops *ops, ptid_t ptid)
{
struct remote_state *rs = get_remote_state ();
char *p, *endp;
if (ptid_equal (ptid, magic_null_ptid))
/* The main thread is always alive. */
return 1;
if (ptid_get_pid (ptid) != 0 && ptid_get_tid (ptid) == 0)
/* The main thread is always alive. This can happen after a
vAttach, if the remote side doesn't support
multi-threading. */
return 1;
p = rs->buf;
endp = rs->buf + get_remote_packet_size ();
*p++ = 'T';
write_ptid (p, endp, ptid);
putpkt (rs->buf);
getpkt (&rs->buf, &rs->buf_size, 0);
return (rs->buf[0] == 'O' && rs->buf[1] == 'K');
}
/* About these extended threadlist and threadinfo packets. They are
variable length packets but, the fields within them are often fixed
length. They are redundent enough to send over UDP as is the
remote protocol in general. There is a matching unit test module
in libstub. */
#define OPAQUETHREADBYTES 8
/* a 64 bit opaque identifier */
typedef unsigned char threadref[OPAQUETHREADBYTES];
/* WARNING: This threadref data structure comes from the remote O.S.,
libstub protocol encoding, and remote.c. It is not particularly
changable. */
/* Right now, the internal structure is int. We want it to be bigger.
Plan to fix this. */
typedef int gdb_threadref; /* Internal GDB thread reference. */
/* gdb_ext_thread_info is an internal GDB data structure which is
equivalent to the reply of the remote threadinfo packet. */
struct gdb_ext_thread_info
{
threadref threadid; /* External form of thread reference. */
int active; /* Has state interesting to GDB?
regs, stack. */
char display[256]; /* Brief state display, name,
blocked/suspended. */
char shortname[32]; /* To be used to name threads. */
char more_display[256]; /* Long info, statistics, queue depth,
whatever. */
};
/* The volume of remote transfers can be limited by submitting
a mask containing bits specifying the desired information.
Use a union of these values as the 'selection' parameter to
get_thread_info. FIXME: Make these TAG names more thread specific. */
#define TAG_THREADID 1
#define TAG_EXISTS 2
#define TAG_DISPLAY 4
#define TAG_THREADNAME 8
#define TAG_MOREDISPLAY 16
#define BUF_THREAD_ID_SIZE (OPAQUETHREADBYTES * 2)
char *unpack_varlen_hex (char *buff, ULONGEST *result);
static char *unpack_nibble (char *buf, int *val);
static char *pack_nibble (char *buf, int nibble);
static char *pack_hex_byte (char *pkt, int /* unsigned char */ byte);
static char *unpack_byte (char *buf, int *value);
static char *pack_int (char *buf, int value);
static char *unpack_int (char *buf, int *value);
static char *unpack_string (char *src, char *dest, int length);
static char *pack_threadid (char *pkt, threadref *id);
static char *unpack_threadid (char *inbuf, threadref *id);
void int_to_threadref (threadref *id, int value);
static int threadref_to_int (threadref *ref);
static void copy_threadref (threadref *dest, threadref *src);
static int threadmatch (threadref *dest, threadref *src);
static char *pack_threadinfo_request (char *pkt, int mode,
threadref *id);
static int remote_unpack_thread_info_response (char *pkt,
threadref *expectedref,
struct gdb_ext_thread_info
*info);
static int remote_get_threadinfo (threadref *threadid,
int fieldset, /*TAG mask */
struct gdb_ext_thread_info *info);
static char *pack_threadlist_request (char *pkt, int startflag,
int threadcount,
threadref *nextthread);
static int parse_threadlist_response (char *pkt,
int result_limit,
threadref *original_echo,
threadref *resultlist,
int *doneflag);
static int remote_get_threadlist (int startflag,
threadref *nextthread,
int result_limit,
int *done,
int *result_count,
threadref *threadlist);
typedef int (*rmt_thread_action) (threadref *ref, void *context);
static int remote_threadlist_iterator (rmt_thread_action stepfunction,
void *context, int looplimit);
static int remote_newthread_step (threadref *ref, void *context);
/* Write a PTID to BUF. ENDBUF points to one-passed-the-end of the
buffer we're allowed to write to. Returns
BUF+CHARACTERS_WRITTEN. */
static char *
write_ptid (char *buf, const char *endbuf, ptid_t ptid)
{
int pid, tid;
struct remote_state *rs = get_remote_state ();
if (remote_multi_process_p (rs))
{
pid = ptid_get_pid (ptid);
if (pid < 0)
buf += xsnprintf (buf, endbuf - buf, "p-%x.", -pid);
else
buf += xsnprintf (buf, endbuf - buf, "p%x.", pid);
}
tid = ptid_get_tid (ptid);
if (tid < 0)
buf += xsnprintf (buf, endbuf - buf, "-%x", -tid);
else
buf += xsnprintf (buf, endbuf - buf, "%x", tid);
return buf;
}
/* Extract a PTID from BUF. If non-null, OBUF is set to the to one
passed the last parsed char. Returns null_ptid on error. */
static ptid_t
read_ptid (char *buf, char **obuf)
{
char *p = buf;
char *pp;
ULONGEST pid = 0, tid = 0;
if (*p == 'p')
{
/* Multi-process ptid. */
pp = unpack_varlen_hex (p + 1, &pid);
if (*pp != '.')
error (_("invalid remote ptid: %s"), p);
p = pp;
pp = unpack_varlen_hex (p + 1, &tid);
if (obuf)
*obuf = pp;
return ptid_build (pid, 0, tid);
}
/* No multi-process. Just a tid. */
pp = unpack_varlen_hex (p, &tid);
/* Since the stub is not sending a process id, then default to
what's in inferior_ptid, unless it's null at this point. If so,
then since there's no way to know the pid of the reported
threads, use the magic number. */
if (ptid_equal (inferior_ptid, null_ptid))
pid = ptid_get_pid (magic_null_ptid);
else
pid = ptid_get_pid (inferior_ptid);
if (obuf)
*obuf = pp;
return ptid_build (pid, 0, tid);
}
/* Encode 64 bits in 16 chars of hex. */
static const char hexchars[] = "0123456789abcdef";
static int
ishex (int ch, int *val)
{
if ((ch >= 'a') && (ch <= 'f'))
{
*val = ch - 'a' + 10;
return 1;
}
if ((ch >= 'A') && (ch <= 'F'))
{
*val = ch - 'A' + 10;
return 1;
}
if ((ch >= '0') && (ch <= '9'))
{
*val = ch - '0';
return 1;
}
return 0;
}
static int
stubhex (int ch)
{
if (ch >= 'a' && ch <= 'f')
return ch - 'a' + 10;
if (ch >= '0' && ch <= '9')
return ch - '0';
if (ch >= 'A' && ch <= 'F')
return ch - 'A' + 10;
return -1;
}
static int
stub_unpack_int (char *buff, int fieldlength)
{
int nibble;
int retval = 0;
while (fieldlength)
{
nibble = stubhex (*buff++);
retval |= nibble;
fieldlength--;
if (fieldlength)
retval = retval << 4;
}
return retval;
}
char *
unpack_varlen_hex (char *buff, /* packet to parse */
ULONGEST *result)
{
int nibble;
ULONGEST retval = 0;
while (ishex (*buff, &nibble))
{
buff++;
retval = retval << 4;
retval |= nibble & 0x0f;
}
*result = retval;
return buff;
}
static char *
unpack_nibble (char *buf, int *val)
{
*val = fromhex (*buf++);
return buf;
}
static char *
pack_nibble (char *buf, int nibble)
{
*buf++ = hexchars[(nibble & 0x0f)];
return buf;
}
static char *
pack_hex_byte (char *pkt, int byte)
{
*pkt++ = hexchars[(byte >> 4) & 0xf];
*pkt++ = hexchars[(byte & 0xf)];
return pkt;
}
static char *
unpack_byte (char *buf, int *value)
{
*value = stub_unpack_int (buf, 2);
return buf + 2;
}
static char *
pack_int (char *buf, int value)
{
buf = pack_hex_byte (buf, (value >> 24) & 0xff);
buf = pack_hex_byte (buf, (value >> 16) & 0xff);
buf = pack_hex_byte (buf, (value >> 8) & 0x0ff);
buf = pack_hex_byte (buf, (value & 0xff));
return buf;
}
static char *
unpack_int (char *buf, int *value)
{
*value = stub_unpack_int (buf, 8);
return buf + 8;
}
#if 0 /* Currently unused, uncomment when needed. */
static char *pack_string (char *pkt, char *string);
static char *
pack_string (char *pkt, char *string)
{
char ch;
int len;
len = strlen (string);
if (len > 200)
len = 200; /* Bigger than most GDB packets, junk??? */
pkt = pack_hex_byte (pkt, len);
while (len-- > 0)
{
ch = *string++;
if ((ch == '\0') || (ch == '#'))
ch = '*'; /* Protect encapsulation. */
*pkt++ = ch;
}
return pkt;
}
#endif /* 0 (unused) */
static char *
unpack_string (char *src, char *dest, int length)
{
while (length--)
*dest++ = *src++;
*dest = '\0';
return src;
}
static char *
pack_threadid (char *pkt, threadref *id)
{
char *limit;
unsigned char *altid;
altid = (unsigned char *) id;
limit = pkt + BUF_THREAD_ID_SIZE;
while (pkt < limit)
pkt = pack_hex_byte (pkt, *altid++);
return pkt;
}
static char *
unpack_threadid (char *inbuf, threadref *id)
{
char *altref;
char *limit = inbuf + BUF_THREAD_ID_SIZE;
int x, y;
altref = (char *) id;
while (inbuf < limit)
{
x = stubhex (*inbuf++);
y = stubhex (*inbuf++);
*altref++ = (x << 4) | y;
}
return inbuf;
}
/* Externally, threadrefs are 64 bits but internally, they are still
ints. This is due to a mismatch of specifications. We would like
to use 64bit thread references internally. This is an adapter
function. */
void
int_to_threadref (threadref *id, int value)
{
unsigned char *scan;
scan = (unsigned char *) id;
{
int i = 4;
while (i--)
*scan++ = 0;
}
*scan++ = (value >> 24) & 0xff;
*scan++ = (value >> 16) & 0xff;
*scan++ = (value >> 8) & 0xff;
*scan++ = (value & 0xff);
}
static int
threadref_to_int (threadref *ref)
{
int i, value = 0;
unsigned char *scan;
scan = *ref;
scan += 4;
i = 4;
while (i-- > 0)
value = (value << 8) | ((*scan++) & 0xff);
return value;
}
static void
copy_threadref (threadref *dest, threadref *src)
{
int i;
unsigned char *csrc, *cdest;
csrc = (unsigned char *) src;
cdest = (unsigned char *) dest;
i = 8;
while (i--)
*cdest++ = *csrc++;
}
static int
threadmatch (threadref *dest, threadref *src)
{
/* Things are broken right now, so just assume we got a match. */
#if 0
unsigned char *srcp, *destp;
int i, result;
srcp = (char *) src;
destp = (char *) dest;
result = 1;
while (i-- > 0)
result &= (*srcp++ == *destp++) ? 1 : 0;
return result;
#endif
return 1;
}
/*
threadid:1, # always request threadid
context_exists:2,
display:4,
unique_name:8,
more_display:16
*/
/* Encoding: 'Q':8,'P':8,mask:32,threadid:64 */
static char *
pack_threadinfo_request (char *pkt, int mode, threadref *id)
{
*pkt++ = 'q'; /* Info Query */
*pkt++ = 'P'; /* process or thread info */
pkt = pack_int (pkt, mode); /* mode */
pkt = pack_threadid (pkt, id); /* threadid */
*pkt = '\0'; /* terminate */
return pkt;
}
/* These values tag the fields in a thread info response packet. */
/* Tagging the fields allows us to request specific fields and to
add more fields as time goes by. */
#define TAG_THREADID 1 /* Echo the thread identifier. */
#define TAG_EXISTS 2 /* Is this process defined enough to
fetch registers and its stack? */
#define TAG_DISPLAY 4 /* A short thing maybe to put on a window */
#define TAG_THREADNAME 8 /* string, maps 1-to-1 with a thread is. */
#define TAG_MOREDISPLAY 16 /* Whatever the kernel wants to say about
the process. */
static int
remote_unpack_thread_info_response (char *pkt, threadref *expectedref,
struct gdb_ext_thread_info *info)
{
struct remote_state *rs = get_remote_state ();
int mask, length;
int tag;
threadref ref;
char *limit = pkt + rs->buf_size; /* Plausible parsing limit. */
int retval = 1;
/* info->threadid = 0; FIXME: implement zero_threadref. */
info->active = 0;
info->display[0] = '\0';
info->shortname[0] = '\0';
info->more_display[0] = '\0';
/* Assume the characters indicating the packet type have been
stripped. */
pkt = unpack_int (pkt, &mask); /* arg mask */
pkt = unpack_threadid (pkt, &ref);
if (mask == 0)
warning (_("Incomplete response to threadinfo request."));
if (!threadmatch (&ref, expectedref))
{ /* This is an answer to a different request. */
warning (_("ERROR RMT Thread info mismatch."));
return 0;
}
copy_threadref (&info->threadid, &ref);
/* Loop on tagged fields , try to bail if somthing goes wrong. */
/* Packets are terminated with nulls. */
while ((pkt < limit) && mask && *pkt)
{
pkt = unpack_int (pkt, &tag); /* tag */
pkt = unpack_byte (pkt, &length); /* length */
if (!(tag & mask)) /* Tags out of synch with mask. */
{
warning (_("ERROR RMT: threadinfo tag mismatch."));
retval = 0;
break;
}
if (tag == TAG_THREADID)
{
if (length != 16)
{
warning (_("ERROR RMT: length of threadid is not 16."));
retval = 0;
break;
}
pkt = unpack_threadid (pkt, &ref);
mask = mask & ~TAG_THREADID;
continue;
}
if (tag == TAG_EXISTS)
{
info->active = stub_unpack_int (pkt, length);
pkt += length;
mask = mask & ~(TAG_EXISTS);
if (length > 8)
{
warning (_("ERROR RMT: 'exists' length too long."));
retval = 0;
break;
}
continue;
}
if (tag == TAG_THREADNAME)
{
pkt = unpack_string (pkt, &info->shortname[0], length);
mask = mask & ~TAG_THREADNAME;
continue;
}
if (tag == TAG_DISPLAY)
{
pkt = unpack_string (pkt, &info->display[0], length);
mask = mask & ~TAG_DISPLAY;
continue;
}
if (tag == TAG_MOREDISPLAY)
{
pkt = unpack_string (pkt, &info->more_display[0], length);
mask = mask & ~TAG_MOREDISPLAY;
continue;
}
warning (_("ERROR RMT: unknown thread info tag."));
break; /* Not a tag we know about. */
}
return retval;
}
static int
remote_get_threadinfo (threadref *threadid, int fieldset, /* TAG mask */
struct gdb_ext_thread_info *info)
{
struct remote_state *rs = get_remote_state ();
int result;
pack_threadinfo_request (rs->buf, fieldset, threadid);
putpkt (rs->buf);
getpkt (&rs->buf, &rs->buf_size, 0);
if (rs->buf[0] == '\0')
return 0;
result = remote_unpack_thread_info_response (rs->buf + 2,
threadid, info);
return result;
}
/* Format: i'Q':8,i"L":8,initflag:8,batchsize:16,lastthreadid:32 */
static char *
pack_threadlist_request (char *pkt, int startflag, int threadcount,
threadref *nextthread)
{
*pkt++ = 'q'; /* info query packet */
*pkt++ = 'L'; /* Process LIST or threadLIST request */
pkt = pack_nibble (pkt, startflag); /* initflag 1 bytes */
pkt = pack_hex_byte (pkt, threadcount); /* threadcount 2 bytes */
pkt = pack_threadid (pkt, nextthread); /* 64 bit thread identifier */
*pkt = '\0';
return pkt;
}
/* Encoding: 'q':8,'M':8,count:16,done:8,argthreadid:64,(threadid:64)* */
static int
parse_threadlist_response (char *pkt, int result_limit,
threadref *original_echo, threadref *resultlist,
int *doneflag)
{
struct remote_state *rs = get_remote_state ();
char *limit;
int count, resultcount, done;
resultcount = 0;
/* Assume the 'q' and 'M chars have been stripped. */
limit = pkt + (rs->buf_size - BUF_THREAD_ID_SIZE);
/* done parse past here */
pkt = unpack_byte (pkt, &count); /* count field */
pkt = unpack_nibble (pkt, &done);
/* The first threadid is the argument threadid. */
pkt = unpack_threadid (pkt, original_echo); /* should match query packet */
while ((count-- > 0) && (pkt < limit))
{
pkt = unpack_threadid (pkt, resultlist++);
if (resultcount++ >= result_limit)
break;
}
if (doneflag)
*doneflag = done;
return resultcount;
}
static int
remote_get_threadlist (int startflag, threadref *nextthread, int result_limit,
int *done, int *result_count, threadref *threadlist)
{
struct remote_state *rs = get_remote_state ();
static threadref echo_nextthread;
int result = 1;
/* Trancate result limit to be smaller than the packet size. */
if ((((result_limit + 1) * BUF_THREAD_ID_SIZE) + 10)
>= get_remote_packet_size ())
result_limit = (get_remote_packet_size () / BUF_THREAD_ID_SIZE) - 2;
pack_threadlist_request (rs->buf, startflag, result_limit, nextthread);
putpkt (rs->buf);
getpkt (&rs->buf, &rs->buf_size, 0);
if (*rs->buf == '\0')
return 0;
else
*result_count =
parse_threadlist_response (rs->buf + 2, result_limit, &echo_nextthread,
threadlist, done);
if (!threadmatch (&echo_nextthread, nextthread))
{
/* FIXME: This is a good reason to drop the packet. */
/* Possably, there is a duplicate response. */
/* Possabilities :
retransmit immediatly - race conditions
retransmit after timeout - yes
exit
wait for packet, then exit
*/
warning (_("HMM: threadlist did not echo arg thread, dropping it."));
return 0; /* I choose simply exiting. */
}
if (*result_count <= 0)
{
if (*done != 1)
{
warning (_("RMT ERROR : failed to get remote thread list."));
result = 0;
}
return result; /* break; */
}
if (*result_count > result_limit)
{
*result_count = 0;
warning (_("RMT ERROR: threadlist response longer than requested."));
return 0;
}
return result;
}
/* This is the interface between remote and threads, remotes upper
interface. */
/* remote_find_new_threads retrieves the thread list and for each
thread in the list, looks up the thread in GDB's internal list,
adding the thread if it does not already exist. This involves
getting partial thread lists from the remote target so, polling the
quit_flag is required. */
/* About this many threadisds fit in a packet. */
#define MAXTHREADLISTRESULTS 32
static int
remote_threadlist_iterator (rmt_thread_action stepfunction, void *context,
int looplimit)
{
int done, i, result_count;
int startflag = 1;
int result = 1;
int loopcount = 0;
static threadref nextthread;
static threadref resultthreadlist[MAXTHREADLISTRESULTS];
done = 0;
while (!done)
{
if (loopcount++ > looplimit)
{
result = 0;
warning (_("Remote fetch threadlist -infinite loop-."));
break;
}
if (!remote_get_threadlist (startflag, &nextthread, MAXTHREADLISTRESULTS,
&done, &result_count, resultthreadlist))
{
result = 0;
break;
}
/* Clear for later iterations. */
startflag = 0;
/* Setup to resume next batch of thread references, set nextthread. */
if (result_count >= 1)
copy_threadref (&nextthread, &resultthreadlist[result_count - 1]);
i = 0;
while (result_count--)
if (!(result = (*stepfunction) (&resultthreadlist[i++], context)))
break;
}
return result;
}
static int
remote_newthread_step (threadref *ref, void *context)
{
int pid = ptid_get_pid (inferior_ptid);
ptid_t ptid = ptid_build (pid, 0, threadref_to_int (ref));
if (!in_thread_list (ptid))
add_thread (ptid);
return 1; /* continue iterator */
}
#define CRAZY_MAX_THREADS 1000
static ptid_t
remote_current_thread (ptid_t oldpid)
{
struct remote_state *rs = get_remote_state ();
putpkt ("qC");
getpkt (&rs->buf, &rs->buf_size, 0);
if (rs->buf[0] == 'Q' && rs->buf[1] == 'C')
return read_ptid (&rs->buf[2], NULL);
else
return oldpid;
}
/* Find new threads for info threads command.
* Original version, using John Metzler's thread protocol.
*/
static void
remote_find_new_threads (void)
{
remote_threadlist_iterator (remote_newthread_step, 0,
CRAZY_MAX_THREADS);
}
#if defined(HAVE_LIBEXPAT)
typedef struct thread_item
{
ptid_t ptid;
char *extra;
int core;
} thread_item_t;
DEF_VEC_O(thread_item_t);
struct threads_parsing_context
{
VEC (thread_item_t) *items;
};
static void
start_thread (struct gdb_xml_parser *parser,
const struct gdb_xml_element *element,
void *user_data, VEC(gdb_xml_value_s) *attributes)
{
struct threads_parsing_context *data = user_data;
struct thread_item item;
char *id;
struct gdb_xml_value *attr;
id = xml_find_attribute (attributes, "id")->value;
item.ptid = read_ptid (id, NULL);
attr = xml_find_attribute (attributes, "core");
if (attr != NULL)
item.core = *(ULONGEST *) attr->value;
else
item.core = -1;
item.extra = 0;
VEC_safe_push (thread_item_t, data->items, &item);
}
static void
end_thread (struct gdb_xml_parser *parser,
const struct gdb_xml_element *element,
void *user_data, const char *body_text)
{
struct threads_parsing_context *data = user_data;
if (body_text && *body_text)
VEC_last (thread_item_t, data->items)->extra = xstrdup (body_text);
}
const struct gdb_xml_attribute thread_attributes[] = {
{ "id", GDB_XML_AF_NONE, NULL, NULL },
{ "core", GDB_XML_AF_OPTIONAL, gdb_xml_parse_attr_ulongest, NULL },
{ NULL, GDB_XML_AF_NONE, NULL, NULL }
};
const struct gdb_xml_element thread_children[] = {
{ NULL, NULL, NULL, GDB_XML_EF_NONE, NULL, NULL }
};
const struct gdb_xml_element threads_children[] = {
{ "thread", thread_attributes, thread_children,
GDB_XML_EF_REPEATABLE | GDB_XML_EF_OPTIONAL,
start_thread, end_thread },
{ NULL, NULL, NULL, GDB_XML_EF_NONE, NULL, NULL }
};
const struct gdb_xml_element threads_elements[] = {
{ "threads", NULL, threads_children,
GDB_XML_EF_NONE, NULL, NULL },
{ NULL, NULL, NULL, GDB_XML_EF_NONE, NULL, NULL }
};
/* Discard the contents of the constructed thread info context. */
static void
clear_threads_parsing_context (void *p)
{
struct threads_parsing_context *context = p;
int i;
struct thread_item *item;
for (i = 0; VEC_iterate (thread_item_t, context->items, i, item); ++i)
xfree (item->extra);
VEC_free (thread_item_t, context->items);
}
#endif
/*
* Find all threads for info threads command.
* Uses new thread protocol contributed by Cisco.
* Falls back and attempts to use the older method (above)
* if the target doesn't respond to the new method.
*/
static void
remote_threads_info (struct target_ops *ops)
{
struct remote_state *rs = get_remote_state ();
char *bufp;
ptid_t new_thread;
if (remote_desc == 0) /* paranoia */
error (_("Command can only be used when connected to the remote target."));
#if defined(HAVE_LIBEXPAT)
if (remote_protocol_packets[PACKET_qXfer_threads].support == PACKET_ENABLE)
{
char *xml = target_read_stralloc (&current_target,
TARGET_OBJECT_THREADS, NULL);
struct cleanup *back_to = make_cleanup (xfree, xml);
if (xml && *xml)
{
struct threads_parsing_context context;
context.items = NULL;
make_cleanup (clear_threads_parsing_context, &context);
if (gdb_xml_parse_quick (_("threads"), "threads.dtd",
threads_elements, xml, &context) == 0)
{
int i;
struct thread_item *item;
for (i = 0;
VEC_iterate (thread_item_t, context.items, i, item);
++i)
{
if (!ptid_equal (item->ptid, null_ptid))
{
struct private_thread_info *info;
/* In non-stop mode, we assume new found threads
are running until proven otherwise with a
stop reply. In all-stop, we can only get
here if all threads are stopped. */
int running = non_stop ? 1 : 0;
remote_notice_new_inferior (item->ptid, running);
info = demand_private_info (item->ptid);
info->core = item->core;
info->extra = item->extra;
item->extra = NULL;
}
}
}
}
do_cleanups (back_to);
return;
}
#endif
if (use_threadinfo_query)
{
putpkt ("qfThreadInfo");
getpkt (&rs->buf, &rs->buf_size, 0);
bufp = rs->buf;
if (bufp[0] != '\0') /* q packet recognized */
{
while (*bufp++ == 'm') /* reply contains one or more TID */
{
do
{
new_thread = read_ptid (bufp, &bufp);
if (!ptid_equal (new_thread, null_ptid))
{
/* In non-stop mode, we assume new found threads
are running until proven otherwise with a
stop reply. In all-stop, we can only get
here if all threads are stopped. */
int running = non_stop ? 1 : 0;
remote_notice_new_inferior (new_thread, running);
}
}
while (*bufp++ == ','); /* comma-separated list */
putpkt ("qsThreadInfo");
getpkt (&rs->buf, &rs->buf_size, 0);
bufp = rs->buf;
}
return; /* done */
}
}
/* Only qfThreadInfo is supported in non-stop mode. */
if (non_stop)
return;
/* Else fall back to old method based on jmetzler protocol. */
use_threadinfo_query = 0;
remote_find_new_threads ();
return;
}
/*
* Collect a descriptive string about the given thread.
* The target may say anything it wants to about the thread
* (typically info about its blocked / runnable state, name, etc.).
* This string will appear in the info threads display.
*
* Optional: targets are not required to implement this function.
*/
static char *
remote_threads_extra_info (struct thread_info *tp)
{
struct remote_state *rs = get_remote_state ();
int result;
int set;
threadref id;
struct gdb_ext_thread_info threadinfo;
static char display_buf[100]; /* arbitrary... */
int n = 0; /* position in display_buf */
if (remote_desc == 0) /* paranoia */
internal_error (__FILE__, __LINE__,
_("remote_threads_extra_info"));
if (ptid_equal (tp->ptid, magic_null_ptid)
|| (ptid_get_pid (tp->ptid) != 0 && ptid_get_tid (tp->ptid) == 0))
/* This is the main thread which was added by GDB. The remote
server doesn't know about it. */
return NULL;
if (remote_protocol_packets[PACKET_qXfer_threads].support == PACKET_ENABLE)
{
struct thread_info *info = find_thread_ptid (tp->ptid);
if (info && info->private)
return info->private->extra;
else
return NULL;
}
if (use_threadextra_query)
{
char *b = rs->buf;
char *endb = rs->buf + get_remote_packet_size ();
xsnprintf (b, endb - b, "qThreadExtraInfo,");
b += strlen (b);
write_ptid (b, endb, tp->ptid);
putpkt (rs->buf);
getpkt (&rs->buf, &rs->buf_size, 0);
if (rs->buf[0] != 0)
{
n = min (strlen (rs->buf) / 2, sizeof (display_buf));
result = hex2bin (rs->buf, (gdb_byte *) display_buf, n);
display_buf [result] = '\0';
return display_buf;
}
}
/* If the above query fails, fall back to the old method. */
use_threadextra_query = 0;
set = TAG_THREADID | TAG_EXISTS | TAG_THREADNAME
| TAG_MOREDISPLAY | TAG_DISPLAY;
int_to_threadref (&id, ptid_get_tid (tp->ptid));
if (remote_get_threadinfo (&id, set, &threadinfo))
if (threadinfo.active)
{
if (*threadinfo.shortname)
n += xsnprintf (&display_buf[0], sizeof (display_buf) - n,
" Name: %s,", threadinfo.shortname);
if (*threadinfo.display)
n += xsnprintf (&display_buf[n], sizeof (display_buf) - n,
" State: %s,", threadinfo.display);
if (*threadinfo.more_display)
n += xsnprintf (&display_buf[n], sizeof (display_buf) - n,
" Priority: %s", threadinfo.more_display);
if (n > 0)
{
/* For purely cosmetic reasons, clear up trailing commas. */
if (',' == display_buf[n-1])
display_buf[n-1] = ' ';
return display_buf;
}
}
return NULL;
}
static int
remote_static_tracepoint_marker_at (CORE_ADDR addr,
struct static_tracepoint_marker *marker)
{
struct remote_state *rs = get_remote_state ();
char *p = rs->buf;
sprintf (p, "qTSTMat:");
p += strlen (p);
p += hexnumstr (p, addr);
putpkt (rs->buf);
getpkt (&rs->buf, &rs->buf_size, 0);
p = rs->buf;
if (*p == 'E')
error (_("Remote failure reply: %s"), p);
if (*p++ == 'm')
{
parse_static_tracepoint_marker_definition (p, &p, marker);
return 1;
}
return 0;
}
static void
free_current_marker (void *arg)
{
struct static_tracepoint_marker **marker_p = arg;
if (*marker_p != NULL)
{
release_static_tracepoint_marker (*marker_p);
xfree (*marker_p);
}
else
*marker_p = NULL;
}
static VEC(static_tracepoint_marker_p) *
remote_static_tracepoint_markers_by_strid (const char *strid)
{
struct remote_state *rs = get_remote_state ();
VEC(static_tracepoint_marker_p) *markers = NULL;
struct static_tracepoint_marker *marker = NULL;
struct cleanup *old_chain;
char *p;
/* Ask for a first packet of static tracepoint marker
definition. */
putpkt ("qTfSTM");
getpkt (&rs->buf, &rs->buf_size, 0);
p = rs->buf;
if (*p == 'E')
error (_("Remote failure reply: %s"), p);
old_chain = make_cleanup (free_current_marker, &marker);
while (*p++ == 'm')
{
if (marker == NULL)
marker = XCNEW (struct static_tracepoint_marker);
do
{
parse_static_tracepoint_marker_definition (p, &p, marker);
if (strid == NULL || strcmp (strid, marker->str_id) == 0)
{
VEC_safe_push (static_tracepoint_marker_p,
markers, marker);
marker = NULL;
}
else
{
release_static_tracepoint_marker (marker);
memset (marker, 0, sizeof (*marker));
}
}
while (*p++ == ','); /* comma-separated list */
/* Ask for another packet of static tracepoint definition. */
putpkt ("qTsSTM");
getpkt (&rs->buf, &rs->buf_size, 0);
p = rs->buf;
}
do_cleanups (old_chain);
return markers;
}
/* Implement the to_get_ada_task_ptid function for the remote targets. */
static ptid_t
remote_get_ada_task_ptid (long lwp, long thread)
{
return ptid_build (ptid_get_pid (inferior_ptid), 0, lwp);
}
/* Restart the remote side; this is an extended protocol operation. */
static void
extended_remote_restart (void)
{
struct remote_state *rs = get_remote_state ();
/* Send the restart command; for reasons I don't understand the
remote side really expects a number after the "R". */
xsnprintf (rs->buf, get_remote_packet_size (), "R%x", 0);
putpkt (rs->buf);
remote_fileio_reset ();
}
/* Clean up connection to a remote debugger. */
static void
remote_close (int quitting)
{
if (remote_desc == NULL)
return; /* already closed */
/* Make sure we leave stdin registered in the event loop, and we
don't leave the async SIGINT signal handler installed. */
remote_terminal_ours ();
serial_close (remote_desc);
remote_desc = NULL;
/* We don't have a connection to the remote stub anymore. Get rid
of all the inferiors and their threads we were controlling.
Reset inferior_ptid to null_ptid first, as otherwise has_stack_frame
will be unable to find the thread corresponding to (pid, 0, 0). */
inferior_ptid = null_ptid;
discard_all_inferiors ();
/* We're no longer interested in any of these events. */
discard_pending_stop_replies (-1);
if (remote_async_inferior_event_token)
delete_async_event_handler (&remote_async_inferior_event_token);
if (remote_async_get_pending_events_token)
delete_async_event_handler (&remote_async_get_pending_events_token);
}
/* Query the remote side for the text, data and bss offsets. */
static void
get_offsets (void)
{
struct remote_state *rs = get_remote_state ();
char *buf;
char *ptr;
int lose, num_segments = 0, do_sections, do_segments;
CORE_ADDR text_addr, data_addr, bss_addr, segments[2];
struct section_offsets *offs;
struct symfile_segment_data *data;
if (symfile_objfile == NULL)
return;
putpkt ("qOffsets");
getpkt (&rs->buf, &rs->buf_size, 0);
buf = rs->buf;
if (buf[0] == '\000')
return; /* Return silently. Stub doesn't support
this command. */
if (buf[0] == 'E')
{
warning (_("Remote failure reply: %s"), buf);
return;
}
/* Pick up each field in turn. This used to be done with scanf, but
scanf will make trouble if CORE_ADDR size doesn't match
conversion directives correctly. The following code will work
with any size of CORE_ADDR. */
text_addr = data_addr = bss_addr = 0;
ptr = buf;
lose = 0;
if (strncmp (ptr, "Text=", 5) == 0)
{
ptr += 5;
/* Don't use strtol, could lose on big values. */
while (*ptr && *ptr != ';')
text_addr = (text_addr << 4) + fromhex (*ptr++);
if (strncmp (ptr, ";Data=", 6) == 0)
{
ptr += 6;
while (*ptr && *ptr != ';')
data_addr = (data_addr << 4) + fromhex (*ptr++);
}
else
lose = 1;
if (!lose && strncmp (ptr, ";Bss=", 5) == 0)
{
ptr += 5;
while (*ptr && *ptr != ';')
bss_addr = (bss_addr << 4) + fromhex (*ptr++);
if (bss_addr != data_addr)
warning (_("Target reported unsupported offsets: %s"), buf);
}
else
lose = 1;
}
else if (strncmp (ptr, "TextSeg=", 8) == 0)
{
ptr += 8;
/* Don't use strtol, could lose on big values. */
while (*ptr && *ptr != ';')
text_addr = (text_addr << 4) + fromhex (*ptr++);
num_segments = 1;
if (strncmp (ptr, ";DataSeg=", 9) == 0)
{
ptr += 9;
while (*ptr && *ptr != ';')
data_addr = (data_addr << 4) + fromhex (*ptr++);
num_segments++;
}
}
else
lose = 1;
if (lose)
error (_("Malformed response to offset query, %s"), buf);
else if (*ptr != '\0')
warning (_("Target reported unsupported offsets: %s"), buf);
offs = ((struct section_offsets *)
alloca (SIZEOF_N_SECTION_OFFSETS (symfile_objfile->num_sections)));
memcpy (offs, symfile_objfile->section_offsets,
SIZEOF_N_SECTION_OFFSETS (symfile_objfile->num_sections));
data = get_symfile_segment_data (symfile_objfile->obfd);
do_segments = (data != NULL);
do_sections = num_segments == 0;
if (num_segments > 0)
{
segments[0] = text_addr;
segments[1] = data_addr;
}
/* If we have two segments, we can still try to relocate everything
by assuming that the .text and .data offsets apply to the whole
text and data segments. Convert the offsets given in the packet
to base addresses for symfile_map_offsets_to_segments. */
else if (data && data->num_segments == 2)
{
segments[0] = data->segment_bases[0] + text_addr;
segments[1] = data->segment_bases[1] + data_addr;
num_segments = 2;
}
/* If the object file has only one segment, assume that it is text
rather than data; main programs with no writable data are rare,
but programs with no code are useless. Of course the code might
have ended up in the data segment... to detect that we would need
the permissions here. */
else if (data && data->num_segments == 1)
{
segments[0] = data->segment_bases[0] + text_addr;
num_segments = 1;
}
/* There's no way to relocate by segment. */
else
do_segments = 0;
if (do_segments)
{
int ret = symfile_map_offsets_to_segments (symfile_objfile->obfd, data,
offs, num_segments, segments);
if (ret == 0 && !do_sections)
error (_("Can not handle qOffsets TextSeg "
"response with this symbol file"));
if (ret > 0)
do_sections = 0;
}
if (data)
free_symfile_segment_data (data);
if (do_sections)
{
offs->offsets[SECT_OFF_TEXT (symfile_objfile)] = text_addr;
/* This is a temporary kludge to force data and bss to use the
same offsets because that's what nlmconv does now. The real
solution requires changes to the stub and remote.c that I
don't have time to do right now. */
offs->offsets[SECT_OFF_DATA (symfile_objfile)] = data_addr;
offs->offsets[SECT_OFF_BSS (symfile_objfile)] = data_addr;
}
objfile_relocate (symfile_objfile, offs);
}
/* Callback for iterate_over_threads. Set the STOP_REQUESTED flags in
threads we know are stopped already. This is used during the
initial remote connection in non-stop mode --- threads that are
reported as already being stopped are left stopped. */
static int
set_stop_requested_callback (struct thread_info *thread, void *data)
{
/* If we have a stop reply for this thread, it must be stopped. */
if (peek_stop_reply (thread->ptid))
set_stop_requested (thread->ptid, 1);
return 0;
}
/* Send interrupt_sequence to remote target. */
static void
send_interrupt_sequence (void)
{
if (interrupt_sequence_mode == interrupt_sequence_control_c)
serial_write (remote_desc, "\x03", 1);
else if (interrupt_sequence_mode == interrupt_sequence_break)
serial_send_break (remote_desc);
else if (interrupt_sequence_mode == interrupt_sequence_break_g)
{
serial_send_break (remote_desc);
serial_write (remote_desc, "g", 1);
}
else
internal_error (__FILE__, __LINE__,
_("Invalid value for interrupt_sequence_mode: %s."),
interrupt_sequence_mode);
}
static void
remote_start_remote (int from_tty, struct target_ops *target, int extended_p)
{
struct remote_state *rs = get_remote_state ();
struct packet_config *noack_config;
char *wait_status = NULL;
immediate_quit++; /* Allow user to interrupt it. */
if (interrupt_on_connect)
send_interrupt_sequence ();
/* Ack any packet which the remote side has already sent. */
serial_write (remote_desc, "+", 1);
/* The first packet we send to the target is the optional "supported
packets" request. If the target can answer this, it will tell us
which later probes to skip. */
remote_query_supported ();
/* If the stub wants to get a QAllow, compose one and send it. */
if (remote_protocol_packets[PACKET_QAllow].support != PACKET_DISABLE)
remote_set_permissions ();
/* Next, we possibly activate noack mode.
If the QStartNoAckMode packet configuration is set to AUTO,
enable noack mode if the stub reported a wish for it with
qSupported.
If set to TRUE, then enable noack mode even if the stub didn't
report it in qSupported. If the stub doesn't reply OK, the
session ends with an error.
If FALSE, then don't activate noack mode, regardless of what the
stub claimed should be the default with qSupported. */
noack_config = &remote_protocol_packets[PACKET_QStartNoAckMode];
if (noack_config->detect == AUTO_BOOLEAN_TRUE
|| (noack_config->detect == AUTO_BOOLEAN_AUTO
&& noack_config->support == PACKET_ENABLE))
{
putpkt ("QStartNoAckMode");
getpkt (&rs->buf, &rs->buf_size, 0);
if (packet_ok (rs->buf, noack_config) == PACKET_OK)
rs->noack_mode = 1;
}
if (extended_p)
{
/* Tell the remote that we are using the extended protocol. */
putpkt ("!");
getpkt (&rs->buf, &rs->buf_size, 0);
}
/* Next, if the target can specify a description, read it. We do
this before anything involving memory or registers. */
target_find_description ();
/* Next, now that we know something about the target, update the
address spaces in the program spaces. */
update_address_spaces ();
/* On OSs where the list of libraries is global to all
processes, we fetch them early. */
if (gdbarch_has_global_solist (target_gdbarch))
solib_add (NULL, from_tty, target, auto_solib_add);
if (non_stop)
{
if (!rs->non_stop_aware)
error (_("Non-stop mode requested, but remote "
"does not support non-stop"));
putpkt ("QNonStop:1");
getpkt (&rs->buf, &rs->buf_size, 0);
if (strcmp (rs->buf, "OK") != 0)
error (_("Remote refused setting non-stop mode with: %s"), rs->buf);
/* Find about threads and processes the stub is already
controlling. We default to adding them in the running state.
The '?' query below will then tell us about which threads are
stopped. */
remote_threads_info (target);
}
else if (rs->non_stop_aware)
{
/* Don't assume that the stub can operate in all-stop mode.
Request it explicitely. */
putpkt ("QNonStop:0");
getpkt (&rs->buf, &rs->buf_size, 0);
if (strcmp (rs->buf, "OK") != 0)
error (_("Remote refused setting all-stop mode with: %s"), rs->buf);
}
/* Check whether the target is running now. */
putpkt ("?");
getpkt (&rs->buf, &rs->buf_size, 0);
if (!non_stop)
{
if (rs->buf[0] == 'W' || rs->buf[0] == 'X')
{
if (!extended_p)
error (_("The target is not running (try extended-remote?)"));
/* We're connected, but not running. Drop out before we
call start_remote. */
return;
}
else
{
/* Save the reply for later. */
wait_status = alloca (strlen (rs->buf) + 1);
strcpy (wait_status, rs->buf);
}
/* Let the stub know that we want it to return the thread. */
set_continue_thread (minus_one_ptid);
/* Without this, some commands which require an active target
(such as kill) won't work. This variable serves (at least)
double duty as both the pid of the target process (if it has
such), and as a flag indicating that a target is active.
These functions should be split out into seperate variables,
especially since GDB will someday have a notion of debugging
several processes. */
inferior_ptid = magic_null_ptid;
/* Now, if we have thread information, update inferior_ptid. */
inferior_ptid = remote_current_thread (inferior_ptid);
remote_add_inferior (ptid_get_pid (inferior_ptid), -1);
/* Always add the main thread. */
add_thread_silent (inferior_ptid);
/* init_wait_for_inferior should be called before get_offsets in order
to manage `inserted' flag in bp loc in a correct state.
breakpoint_init_inferior, called from init_wait_for_inferior, set
`inserted' flag to 0, while before breakpoint_re_set, called from
start_remote, set `inserted' flag to 1. In the initialization of
inferior, breakpoint_init_inferior should be called first, and then
breakpoint_re_set can be called. If this order is broken, state of
`inserted' flag is wrong, and cause some problems on breakpoint
manipulation. */
init_wait_for_inferior ();
get_offsets (); /* Get text, data & bss offsets. */
/* If we could not find a description using qXfer, and we know
how to do it some other way, try again. This is not
supported for non-stop; it could be, but it is tricky if
there are no stopped threads when we connect. */
if (remote_read_description_p (target)
&& gdbarch_target_desc (target_gdbarch) == NULL)
{
target_clear_description ();
target_find_description ();
}
/* Use the previously fetched status. */
gdb_assert (wait_status != NULL);
strcpy (rs->buf, wait_status);
rs->cached_wait_status = 1;
immediate_quit--;
start_remote (from_tty); /* Initialize gdb process mechanisms. */
}
else
{
/* Clear WFI global state. Do this before finding about new
threads and inferiors, and setting the current inferior.
Otherwise we would clear the proceed status of the current
inferior when we want its stop_soon state to be preserved
(see notice_new_inferior). */
init_wait_for_inferior ();
/* In non-stop, we will either get an "OK", meaning that there
are no stopped threads at this time; or, a regular stop
reply. In the latter case, there may be more than one thread
stopped --- we pull them all out using the vStopped
mechanism. */
if (strcmp (rs->buf, "OK") != 0)
{
struct stop_reply *stop_reply;
struct cleanup *old_chain;
stop_reply = stop_reply_xmalloc ();
old_chain = make_cleanup (do_stop_reply_xfree, stop_reply);
remote_parse_stop_reply (rs->buf, stop_reply);
discard_cleanups (old_chain);
/* get_pending_stop_replies acks this one, and gets the rest
out. */
pending_stop_reply = stop_reply;
remote_get_pending_stop_replies ();
/* Make sure that threads that were stopped remain
stopped. */
iterate_over_threads (set_stop_requested_callback, NULL);
}
if (target_can_async_p ())
target_async (inferior_event_handler, 0);
if (thread_count () == 0)
{
if (!extended_p)
error (_("The target is not running (try extended-remote?)"));
/* We're connected, but not running. Drop out before we
call start_remote. */
return;
}
/* Let the stub know that we want it to return the thread. */
/* Force the stub to choose a thread. */
set_general_thread (null_ptid);
/* Query it. */
inferior_ptid = remote_current_thread (minus_one_ptid);
if (ptid_equal (inferior_ptid, minus_one_ptid))
error (_("remote didn't report the current thread in non-stop mode"));
get_offsets (); /* Get text, data & bss offsets. */
/* In non-stop mode, any cached wait status will be stored in
the stop reply queue. */
gdb_assert (wait_status == NULL);
/* Report all signals during attach/startup. */
remote_pass_signals (0, NULL);
}
/* If we connected to a live target, do some additional setup. */
if (target_has_execution)
{
if (exec_bfd) /* No use without an exec file. */
remote_check_symbols (symfile_objfile);
}
/* Possibly the target has been engaged in a trace run started
previously; find out where things are at. */
if (remote_get_trace_status (current_trace_status ()) != -1)
{
struct uploaded_tp *uploaded_tps = NULL;
struct uploaded_tsv *uploaded_tsvs = NULL;
if (current_trace_status ()->running)
printf_filtered (_("Trace is already running on the target.\n"));
/* Get trace state variables first, they may be checked when
parsing uploaded commands. */
remote_upload_trace_state_variables (&uploaded_tsvs);
merge_uploaded_trace_state_variables (&uploaded_tsvs);
remote_upload_tracepoints (&uploaded_tps);
merge_uploaded_tracepoints (&uploaded_tps);
}
/* If breakpoints are global, insert them now. */
if (gdbarch_has_global_breakpoints (target_gdbarch)
&& breakpoints_always_inserted_mode ())
insert_breakpoints ();
}
/* Open a connection to a remote debugger.
NAME is the filename used for communication. */
static void
remote_open (char *name, int from_tty)
{
remote_open_1 (name, from_tty, &remote_ops, 0);
}
/* Open a connection to a remote debugger using the extended
remote gdb protocol. NAME is the filename used for communication. */
static void
extended_remote_open (char *name, int from_tty)
{
remote_open_1 (name, from_tty, &extended_remote_ops, 1 /*extended_p */);
}
/* Generic code for opening a connection to a remote target. */
static void
init_all_packet_configs (void)
{
int i;
for (i = 0; i < PACKET_MAX; i++)
update_packet_config (&remote_protocol_packets[i]);
}
/* Symbol look-up. */
static void
remote_check_symbols (struct objfile *objfile)
{
struct remote_state *rs = get_remote_state ();
char *msg, *reply, *tmp;
struct minimal_symbol *sym;
int end;
/* The remote side has no concept of inferiors that aren't running
yet, it only knows about running processes. If we're connected
but our current inferior is not running, we should not invite the
remote target to request symbol lookups related to its
(unrelated) current process. */
if (!target_has_execution)
return;
if (remote_protocol_packets[PACKET_qSymbol].support == PACKET_DISABLE)
return;
/* Make sure the remote is pointing at the right process. Note
there's no way to select "no process". */
set_general_process ();
/* Allocate a message buffer. We can't reuse the input buffer in RS,
because we need both at the same time. */
msg = alloca (get_remote_packet_size ());
/* Invite target to request symbol lookups. */
putpkt ("qSymbol::");
getpkt (&rs->buf, &rs->buf_size, 0);
packet_ok (rs->buf, &remote_protocol_packets[PACKET_qSymbol]);
reply = rs->buf;
while (strncmp (reply, "qSymbol:", 8) == 0)
{
tmp = &reply[8];
end = hex2bin (tmp, (gdb_byte *) msg, strlen (tmp) / 2);
msg[end] = '\0';
sym = lookup_minimal_symbol (msg, NULL, NULL);
if (sym == NULL)
xsnprintf (msg, get_remote_packet_size (), "qSymbol::%s", &reply[8]);
else
{
int addr_size = gdbarch_addr_bit (target_gdbarch) / 8;
CORE_ADDR sym_addr = SYMBOL_VALUE_ADDRESS (sym);
/* If this is a function address, return the start of code
instead of any data function descriptor. */
sym_addr = gdbarch_convert_from_func_ptr_addr (target_gdbarch,
sym_addr,
&current_target);
xsnprintf (msg, get_remote_packet_size (), "qSymbol:%s:%s",
phex_nz (sym_addr, addr_size), &reply[8]);
}
putpkt (msg);
getpkt (&rs->buf, &rs->buf_size, 0);
reply = rs->buf;
}
}
static struct serial *
remote_serial_open (char *name)
{
static int udp_warning = 0;
/* FIXME: Parsing NAME here is a hack. But we want to warn here instead
of in ser-tcp.c, because it is the remote protocol assuming that the
serial connection is reliable and not the serial connection promising
to be. */
if (!udp_warning && strncmp (name, "udp:", 4) == 0)
{
warning (_("The remote protocol may be unreliable over UDP.\n"
"Some events may be lost, rendering further debugging "
"impossible."));
udp_warning = 1;
}
return serial_open (name);
}
/* Inform the target of our permission settings. The permission flags
work without this, but if the target knows the settings, it can do
a couple things. First, it can add its own check, to catch cases
that somehow manage to get by the permissions checks in target
methods. Second, if the target is wired to disallow particular
settings (for instance, a system in the field that is not set up to
be able to stop at a breakpoint), it can object to any unavailable
permissions. */
void
remote_set_permissions (void)
{
struct remote_state *rs = get_remote_state ();
sprintf (rs->buf, "QAllow:"
"WriteReg:%x;WriteMem:%x;"
"InsertBreak:%x;InsertTrace:%x;"
"InsertFastTrace:%x;Stop:%x",
may_write_registers, may_write_memory,
may_insert_breakpoints, may_insert_tracepoints,
may_insert_fast_tracepoints, may_stop);
putpkt (rs->buf);
getpkt (&rs->buf, &rs->buf_size, 0);
/* If the target didn't like the packet, warn the user. Do not try
to undo the user's settings, that would just be maddening. */
if (strcmp (rs->buf, "OK") != 0)
warning (_("Remote refused setting permissions with: %s"), rs->buf);
}
/* This type describes each known response to the qSupported
packet. */
struct protocol_feature
{
/* The name of this protocol feature. */
const char *name;
/* The default for this protocol feature. */
enum packet_support default_support;
/* The function to call when this feature is reported, or after
qSupported processing if the feature is not supported.
The first argument points to this structure. The second
argument indicates whether the packet requested support be
enabled, disabled, or probed (or the default, if this function
is being called at the end of processing and this feature was
not reported). The third argument may be NULL; if not NULL, it
is a NUL-terminated string taken from the packet following
this feature's name and an equals sign. */
void (*func) (const struct protocol_feature *, enum packet_support,
const char *);
/* The corresponding packet for this feature. Only used if
FUNC is remote_supported_packet. */
int packet;
};
static void
remote_supported_packet (const struct protocol_feature *feature,
enum packet_support support,
const char *argument)
{
if (argument)
{
warning (_("Remote qSupported response supplied an unexpected value for"
" \"%s\"."), feature->name);
return;
}
if (remote_protocol_packets[feature->packet].support
== PACKET_SUPPORT_UNKNOWN)
remote_protocol_packets[feature->packet].support = support;
}
static void
remote_packet_size (const struct protocol_feature *feature,
enum packet_support support, const char *value)
{
struct remote_state *rs = get_remote_state ();
int packet_size;
char *value_end;
if (support != PACKET_ENABLE)
return;
if (value == NULL || *value == '\0')
{
warning (_("Remote target reported \"%s\" without a size."),
feature->name);
return;
}
errno = 0;
packet_size = strtol (value, &value_end, 16);
if (errno != 0 || *value_end != '\0' || packet_size < 0)
{
warning (_("Remote target reported \"%s\" with a bad size: \"%s\"."),
feature->name, value);
return;
}
if (packet_size > MAX_REMOTE_PACKET_SIZE)
{
warning (_("limiting remote suggested packet size (%d bytes) to %d"),
packet_size, MAX_REMOTE_PACKET_SIZE);
packet_size = MAX_REMOTE_PACKET_SIZE;
}
/* Record the new maximum packet size. */
rs->explicit_packet_size = packet_size;
}
static void
remote_multi_process_feature (const struct protocol_feature *feature,
enum packet_support support, const char *value)
{
struct remote_state *rs = get_remote_state ();
rs->multi_process_aware = (support == PACKET_ENABLE);
}
static void
remote_non_stop_feature (const struct protocol_feature *feature,
enum packet_support support, const char *value)
{
struct remote_state *rs = get_remote_state ();
rs->non_stop_aware = (support == PACKET_ENABLE);
}
static void
remote_cond_tracepoint_feature (const struct protocol_feature *feature,
enum packet_support support,
const char *value)
{
struct remote_state *rs = get_remote_state ();
rs->cond_tracepoints = (support == PACKET_ENABLE);
}
static void
remote_fast_tracepoint_feature (const struct protocol_feature *feature,
enum packet_support support,
const char *value)
{
struct remote_state *rs = get_remote_state ();
rs->fast_tracepoints = (support == PACKET_ENABLE);
}
static void
remote_static_tracepoint_feature (const struct protocol_feature *feature,
enum packet_support support,
const char *value)
{
struct remote_state *rs = get_remote_state ();
rs->static_tracepoints = (support == PACKET_ENABLE);
}
static void
remote_install_in_trace_feature (const struct protocol_feature *feature,
enum packet_support support,
const char *value)
{
struct remote_state *rs = get_remote_state ();
rs->install_in_trace = (support == PACKET_ENABLE);
}
static void
remote_disconnected_tracing_feature (const struct protocol_feature *feature,
enum packet_support support,
const char *value)
{
struct remote_state *rs = get_remote_state ();
rs->disconnected_tracing = (support == PACKET_ENABLE);
}
static void
remote_enable_disable_tracepoint_feature (const struct protocol_feature *feature,
enum packet_support support,
const char *value)
{
struct remote_state *rs = get_remote_state ();
rs->enable_disable_tracepoints = (support == PACKET_ENABLE);
}
static void
remote_string_tracing_feature (const struct protocol_feature *feature,
enum packet_support support,
const char *value)
{
struct remote_state *rs = get_remote_state ();
rs->string_tracing = (support == PACKET_ENABLE);
}
static struct protocol_feature remote_protocol_features[] = {
{ "PacketSize", PACKET_DISABLE, remote_packet_size, -1 },
{ "qXfer:auxv:read", PACKET_DISABLE, remote_supported_packet,
PACKET_qXfer_auxv },
{ "qXfer:features:read", PACKET_DISABLE, remote_supported_packet,
PACKET_qXfer_features },
{ "qXfer:libraries:read", PACKET_DISABLE, remote_supported_packet,
PACKET_qXfer_libraries },
{ "qXfer:libraries-svr4:read", PACKET_DISABLE, remote_supported_packet,
PACKET_qXfer_libraries_svr4 },
{ "qXfer:memory-map:read", PACKET_DISABLE, remote_supported_packet,
PACKET_qXfer_memory_map },
{ "qXfer:spu:read", PACKET_DISABLE, remote_supported_packet,
PACKET_qXfer_spu_read },
{ "qXfer:spu:write", PACKET_DISABLE, remote_supported_packet,
PACKET_qXfer_spu_write },
{ "qXfer:osdata:read", PACKET_DISABLE, remote_supported_packet,
PACKET_qXfer_osdata },
{ "qXfer:threads:read", PACKET_DISABLE, remote_supported_packet,
PACKET_qXfer_threads },
{ "qXfer:traceframe-info:read", PACKET_DISABLE, remote_supported_packet,
PACKET_qXfer_traceframe_info },
{ "QPassSignals", PACKET_DISABLE, remote_supported_packet,
PACKET_QPassSignals },
{ "QStartNoAckMode", PACKET_DISABLE, remote_supported_packet,
PACKET_QStartNoAckMode },
{ "multiprocess", PACKET_DISABLE, remote_multi_process_feature, -1 },
{ "QNonStop", PACKET_DISABLE, remote_non_stop_feature, -1 },
{ "qXfer:siginfo:read", PACKET_DISABLE, remote_supported_packet,
PACKET_qXfer_siginfo_read },
{ "qXfer:siginfo:write", PACKET_DISABLE, remote_supported_packet,
PACKET_qXfer_siginfo_write },
{ "ConditionalTracepoints", PACKET_DISABLE, remote_cond_tracepoint_feature,
PACKET_ConditionalTracepoints },
{ "FastTracepoints", PACKET_DISABLE, remote_fast_tracepoint_feature,
PACKET_FastTracepoints },
{ "StaticTracepoints", PACKET_DISABLE, remote_static_tracepoint_feature,
PACKET_StaticTracepoints },
{"InstallInTrace", PACKET_DISABLE, remote_install_in_trace_feature,
PACKET_InstallInTrace},
{ "DisconnectedTracing", PACKET_DISABLE, remote_disconnected_tracing_feature,
-1 },
{ "ReverseContinue", PACKET_DISABLE, remote_supported_packet,
PACKET_bc },
{ "ReverseStep", PACKET_DISABLE, remote_supported_packet,
PACKET_bs },
{ "TracepointSource", PACKET_DISABLE, remote_supported_packet,
PACKET_TracepointSource },
{ "QAllow", PACKET_DISABLE, remote_supported_packet,
PACKET_QAllow },
{ "EnableDisableTracepoints", PACKET_DISABLE,
remote_enable_disable_tracepoint_feature, -1 },
{ "qXfer:fdpic:read", PACKET_DISABLE, remote_supported_packet,
PACKET_qXfer_fdpic },
{ "QDisableRandomization", PACKET_DISABLE, remote_supported_packet,
PACKET_QDisableRandomization },
{ "tracenz", PACKET_DISABLE,
remote_string_tracing_feature, -1 },
};
static char *remote_support_xml;
/* Register string appended to "xmlRegisters=" in qSupported query. */
void
register_remote_support_xml (const char *xml)
{
#if defined(HAVE_LIBEXPAT)
if (remote_support_xml == NULL)
remote_support_xml = concat ("xmlRegisters=", xml, (char *) NULL);
else
{
char *copy = xstrdup (remote_support_xml + 13);
char *p = strtok (copy, ",");
do
{
if (strcmp (p, xml) == 0)
{
/* already there */
xfree (copy);
return;
}
}
while ((p = strtok (NULL, ",")) != NULL);
xfree (copy);
remote_support_xml = reconcat (remote_support_xml,
remote_support_xml, ",", xml,
(char *) NULL);
}
#endif
}
static char *
remote_query_supported_append (char *msg, const char *append)
{
if (msg)
return reconcat (msg, msg, ";", append, (char *) NULL);
else
return xstrdup (append);
}
static void
remote_query_supported (void)
{
struct remote_state *rs = get_remote_state ();
char *next;
int i;
unsigned char seen [ARRAY_SIZE (remote_protocol_features)];
/* The packet support flags are handled differently for this packet
than for most others. We treat an error, a disabled packet, and
an empty response identically: any features which must be reported
to be used will be automatically disabled. An empty buffer
accomplishes this, since that is also the representation for a list
containing no features. */
rs->buf[0] = 0;
if (remote_protocol_packets[PACKET_qSupported].support != PACKET_DISABLE)
{
char *q = NULL;
struct cleanup *old_chain = make_cleanup (free_current_contents, &q);
if (rs->extended)
q = remote_query_supported_append (q, "multiprocess+");
if (remote_support_xml)
q = remote_query_supported_append (q, remote_support_xml);
q = remote_query_supported_append (q, "qRelocInsn+");
q = reconcat (q, "qSupported:", q, (char *) NULL);
putpkt (q);
do_cleanups (old_chain);
getpkt (&rs->buf, &rs->buf_size, 0);
/* If an error occured, warn, but do not return - just reset the
buffer to empty and go on to disable features. */
if (packet_ok (rs->buf, &remote_protocol_packets[PACKET_qSupported])
== PACKET_ERROR)
{
warning (_("Remote failure reply: %s"), rs->buf);
rs->buf[0] = 0;
}
}
memset (seen, 0, sizeof (seen));
next = rs->buf;
while (*next)
{
enum packet_support is_supported;
char *p, *end, *name_end, *value;
/* First separate out this item from the rest of the packet. If
there's another item after this, we overwrite the separator
(terminated strings are much easier to work with). */
p = next;
end = strchr (p, ';');
if (end == NULL)
{
end = p + strlen (p);
next = end;
}
else
{
*end = '\0';
next = end + 1;
if (end == p)
{
warning (_("empty item in \"qSupported\" response"));
continue;
}
}
name_end = strchr (p, '=');
if (name_end)
{
/* This is a name=value entry. */
is_supported = PACKET_ENABLE;
value = name_end + 1;
*name_end = '\0';
}
else
{
value = NULL;
switch (end[-1])
{
case '+':
is_supported = PACKET_ENABLE;
break;
case '-':
is_supported = PACKET_DISABLE;
break;
case '?':
is_supported = PACKET_SUPPORT_UNKNOWN;
break;
default:
warning (_("unrecognized item \"%s\" "
"in \"qSupported\" response"), p);
continue;
}
end[-1] = '\0';
}
for (i = 0; i < ARRAY_SIZE (remote_protocol_features); i++)
if (strcmp (remote_protocol_features[i].name, p) == 0)
{
const struct protocol_feature *feature;
seen[i] = 1;
feature = &remote_protocol_features[i];
feature->func (feature, is_supported, value);
break;
}
}
/* If we increased the packet size, make sure to increase the global
buffer size also. We delay this until after parsing the entire
qSupported packet, because this is the same buffer we were
parsing. */
if (rs->buf_size < rs->explicit_packet_size)
{
rs->buf_size = rs->explicit_packet_size;
rs->buf = xrealloc (rs->buf, rs->buf_size);
}
/* Handle the defaults for unmentioned features. */
for (i = 0; i < ARRAY_SIZE (remote_protocol_features); i++)
if (!seen[i])
{
const struct protocol_feature *feature;
feature = &remote_protocol_features[i];
feature->func (feature, feature->default_support, NULL);
}
}
static void
remote_open_1 (char *name, int from_tty,
struct target_ops *target, int extended_p)
{
struct remote_state *rs = get_remote_state ();
if (name == 0)
error (_("To open a remote debug connection, you need to specify what\n"
"serial device is attached to the remote system\n"
"(e.g. /dev/ttyS0, /dev/ttya, COM1, etc.)."));
/* See FIXME above. */
if (!target_async_permitted)
wait_forever_enabled_p = 1;
/* If we're connected to a running target, target_preopen will kill it.
But if we're connected to a target system with no running process,
then we will still be connected when it returns. Ask this question
first, before target_preopen has a chance to kill anything. */
if (remote_desc != NULL && !have_inferiors ())
{
if (!from_tty
|| query (_("Already connected to a remote target. Disconnect? ")))
pop_target ();
else
error (_("Still connected."));
}
target_preopen (from_tty);
unpush_target (target);
/* This time without a query. If we were connected to an
extended-remote target and target_preopen killed the running
process, we may still be connected. If we are starting "target
remote" now, the extended-remote target will not have been
removed by unpush_target. */
if (remote_desc != NULL && !have_inferiors ())
pop_target ();
/* Make sure we send the passed signals list the next time we resume. */
xfree (last_pass_packet);
last_pass_packet = NULL;
remote_fileio_reset ();
reopen_exec_file ();
reread_symbols ();
remote_desc = remote_serial_open (name);
if (!remote_desc)
perror_with_name (name);
if (baud_rate != -1)
{
if (serial_setbaudrate (remote_desc, baud_rate))
{
/* The requested speed could not be set. Error out to
top level after closing remote_desc. Take care to
set remote_desc to NULL to avoid closing remote_desc
more than once. */
serial_close (remote_desc);
remote_desc = NULL;
perror_with_name (name);
}
}
serial_raw (remote_desc);
/* If there is something sitting in the buffer we might take it as a
response to a command, which would be bad. */
serial_flush_input (remote_desc);
if (from_tty)
{
puts_filtered ("Remote debugging using ");
puts_filtered (name);
puts_filtered ("\n");
}
push_target (target); /* Switch to using remote target now. */
/* Register extra event sources in the event loop. */
remote_async_inferior_event_token
= create_async_event_handler (remote_async_inferior_event_handler,
NULL);
remote_async_get_pending_events_token
= create_async_event_handler (remote_async_get_pending_events_handler,
NULL);
/* Reset the target state; these things will be queried either by
remote_query_supported or as they are needed. */
init_all_packet_configs ();
rs->cached_wait_status = 0;
rs->explicit_packet_size = 0;
rs->noack_mode = 0;
rs->multi_process_aware = 0;
rs->extended = extended_p;
rs->non_stop_aware = 0;
rs->waiting_for_stop_reply = 0;
rs->ctrlc_pending_p = 0;
general_thread = not_sent_ptid;
continue_thread = not_sent_ptid;
remote_traceframe_number = -1;
/* Probe for ability to use "ThreadInfo" query, as required. */
use_threadinfo_query = 1;
use_threadextra_query = 1;
if (target_async_permitted)
{
/* With this target we start out by owning the terminal. */
remote_async_terminal_ours_p = 1;
/* FIXME: cagney/1999-09-23: During the initial connection it is
assumed that the target is already ready and able to respond to
requests. Unfortunately remote_start_remote() eventually calls
wait_for_inferior() with no timeout. wait_forever_enabled_p gets
around this. Eventually a mechanism that allows
wait_for_inferior() to expect/get timeouts will be
implemented. */
wait_forever_enabled_p = 0;
}
/* First delete any symbols previously loaded from shared libraries. */
no_shared_libraries (NULL, 0);
/* Start afresh. */
init_thread_list ();
/* Start the remote connection. If error() or QUIT, discard this
target (we'd otherwise be in an inconsistent state) and then
propogate the error on up the exception chain. This ensures that
the caller doesn't stumble along blindly assuming that the
function succeeded. The CLI doesn't have this problem but other
UI's, such as MI do.
FIXME: cagney/2002-05-19: Instead of re-throwing the exception,
this function should return an error indication letting the
caller restore the previous state. Unfortunately the command
``target remote'' is directly wired to this function making that
impossible. On a positive note, the CLI side of this problem has
been fixed - the function set_cmd_context() makes it possible for
all the ``target ....'' commands to share a common callback
function. See cli-dump.c. */
{
volatile struct gdb_exception ex;
TRY_CATCH (ex, RETURN_MASK_ALL)
{
remote_start_remote (from_tty, target, extended_p);
}
if (ex.reason < 0)
{
/* Pop the partially set up target - unless something else did
already before throwing the exception. */
if (remote_desc != NULL)
pop_target ();
if (target_async_permitted)
wait_forever_enabled_p = 1;
throw_exception (ex);
}
}
if (target_async_permitted)
wait_forever_enabled_p = 1;
}
/* This takes a program previously attached to and detaches it. After
this is done, GDB can be used to debug some other program. We
better not have left any breakpoints in the target program or it'll
die when it hits one. */
static void
remote_detach_1 (char *args, int from_tty, int extended)
{
int pid = ptid_get_pid (inferior_ptid);
struct remote_state *rs = get_remote_state ();
if (args)
error (_("Argument given to \"detach\" when remotely debugging."));
if (!target_has_execution)
error (_("No process to detach from."));
/* Tell the remote target to detach. */
if (remote_multi_process_p (rs))
sprintf (rs->buf, "D;%x", pid);
else
strcpy (rs->buf, "D");
putpkt (rs->buf);
getpkt (&rs->buf, &rs->buf_size, 0);
if (rs->buf[0] == 'O' && rs->buf[1] == 'K')
;
else if (rs->buf[0] == '\0')
error (_("Remote doesn't know how to detach"));
else
error (_("Can't detach process."));
if (from_tty)
{
if (remote_multi_process_p (rs))
printf_filtered (_("Detached from remote %s.\n"),
target_pid_to_str (pid_to_ptid (pid)));
else
{
if (extended)
puts_filtered (_("Detached from remote process.\n"));
else
puts_filtered (_("Ending remote debugging.\n"));
}
}
discard_pending_stop_replies (pid);
target_mourn_inferior ();
}
static void
remote_detach (struct target_ops *ops, char *args, int from_tty)
{
remote_detach_1 (args, from_tty, 0);
}
static void
extended_remote_detach (struct target_ops *ops, char *args, int from_tty)
{
remote_detach_1 (args, from_tty, 1);
}
/* Same as remote_detach, but don't send the "D" packet; just disconnect. */
static void
remote_disconnect (struct target_ops *target, char *args, int from_tty)
{
if (args)
error (_("Argument given to \"disconnect\" when remotely debugging."));
/* Make sure we unpush even the extended remote targets; mourn
won't do it. So call remote_mourn_1 directly instead of
target_mourn_inferior. */
remote_mourn_1 (target);
if (from_tty)
puts_filtered ("Ending remote debugging.\n");
}
/* Attach to the process specified by ARGS. If FROM_TTY is non-zero,
be chatty about it. */
static void
extended_remote_attach_1 (struct target_ops *target, char *args, int from_tty)
{
struct remote_state *rs = get_remote_state ();
int pid;
char *wait_status = NULL;
pid = parse_pid_to_attach (args);
/* Remote PID can be freely equal to getpid, do not check it here the same
way as in other targets. */
if (remote_protocol_packets[PACKET_vAttach].support == PACKET_DISABLE)
error (_("This target does not support attaching to a process"));
sprintf (rs->buf, "vAttach;%x", pid);
putpkt (rs->buf);
getpkt (&rs->buf, &rs->buf_size, 0);
if (packet_ok (rs->buf,
&remote_protocol_packets[PACKET_vAttach]) == PACKET_OK)
{
if (from_tty)
printf_unfiltered (_("Attached to %s\n"),
target_pid_to_str (pid_to_ptid (pid)));
if (!non_stop)
{
/* Save the reply for later. */
wait_status = alloca (strlen (rs->buf) + 1);
strcpy (wait_status, rs->buf);
}
else if (strcmp (rs->buf, "OK") != 0)
error (_("Attaching to %s failed with: %s"),
target_pid_to_str (pid_to_ptid (pid)),
rs->buf);
}
else if (remote_protocol_packets[PACKET_vAttach].support == PACKET_DISABLE)
error (_("This target does not support attaching to a process"));
else
error (_("Attaching to %s failed"),
target_pid_to_str (pid_to_ptid (pid)));
set_current_inferior (remote_add_inferior (pid, 1));
inferior_ptid = pid_to_ptid (pid);
if (non_stop)
{
struct thread_info *thread;
/* Get list of threads. */
remote_threads_info (target);
thread = first_thread_of_process (pid);
if (thread)
inferior_ptid = thread->ptid;
else
inferior_ptid = pid_to_ptid (pid);
/* Invalidate our notion of the remote current thread. */
record_currthread (minus_one_ptid);
}
else
{
/* Now, if we have thread information, update inferior_ptid. */
inferior_ptid = remote_current_thread (inferior_ptid);
/* Add the main thread to the thread list. */
add_thread_silent (inferior_ptid);
}
/* Next, if the target can specify a description, read it. We do
this before anything involving memory or registers. */
target_find_description ();
if (!non_stop)
{
/* Use the previously fetched status. */
gdb_assert (wait_status != NULL);
if (target_can_async_p ())
{
struct stop_reply *stop_reply;
struct cleanup *old_chain;
stop_reply = stop_reply_xmalloc ();
old_chain = make_cleanup (do_stop_reply_xfree, stop_reply);
remote_parse_stop_reply (wait_status, stop_reply);
discard_cleanups (old_chain);
push_stop_reply (stop_reply);
target_async (inferior_event_handler, 0);
}
else
{
gdb_assert (wait_status != NULL);
strcpy (rs->buf, wait_status);
rs->cached_wait_status = 1;
}
}
else
gdb_assert (wait_status == NULL);
}
static void
extended_remote_attach (struct target_ops *ops, char *args, int from_tty)
{
extended_remote_attach_1 (ops, args, from_tty);
}
/* Convert hex digit A to a number. */
static int
fromhex (int a)
{
if (a >= '0' && a <= '9')
return a - '0';
else if (a >= 'a' && a <= 'f')
return a - 'a' + 10;
else if (a >= 'A' && a <= 'F')
return a - 'A' + 10;
else
error (_("Reply contains invalid hex digit %d"), a);
}
int
hex2bin (const char *hex, gdb_byte *bin, int count)
{
int i;
for (i = 0; i < count; i++)
{
if (hex[0] == 0 || hex[1] == 0)
{
/* Hex string is short, or of uneven length.
Return the count that has been converted so far. */
return i;
}
*bin++ = fromhex (hex[0]) * 16 + fromhex (hex[1]);
hex += 2;
}
return i;
}
/* Convert number NIB to a hex digit. */
static int
tohex (int nib)
{
if (nib < 10)
return '0' + nib;
else
return 'a' + nib - 10;
}
int
bin2hex (const gdb_byte *bin, char *hex, int count)
{
int i;
/* May use a length, or a nul-terminated string as input. */
if (count == 0)
count = strlen ((char *) bin);
for (i = 0; i < count; i++)
{
*hex++ = tohex ((*bin >> 4) & 0xf);
*hex++ = tohex (*bin++ & 0xf);
}
*hex = 0;
return i;
}
/* Check for the availability of vCont. This function should also check
the response. */
static void
remote_vcont_probe (struct remote_state *rs)
{
char *buf;
strcpy (rs->buf, "vCont?");
putpkt (rs->buf);
getpkt (&rs->buf, &rs->buf_size, 0);
buf = rs->buf;
/* Make sure that the features we assume are supported. */
if (strncmp (buf, "vCont", 5) == 0)
{
char *p = &buf[5];
int support_s, support_S, support_c, support_C;
support_s = 0;
support_S = 0;
support_c = 0;
support_C = 0;
rs->support_vCont_t = 0;
while (p && *p == ';')
{
p++;
if (*p == 's' && (*(p + 1) == ';' || *(p + 1) == 0))
support_s = 1;
else if (*p == 'S' && (*(p + 1) == ';' || *(p + 1) == 0))
support_S = 1;
else if (*p == 'c' && (*(p + 1) == ';' || *(p + 1) == 0))
support_c = 1;
else if (*p == 'C' && (*(p + 1) == ';' || *(p + 1) == 0))
support_C = 1;
else if (*p == 't' && (*(p + 1) == ';' || *(p + 1) == 0))
rs->support_vCont_t = 1;
p = strchr (p, ';');
}
/* If s, S, c, and C are not all supported, we can't use vCont. Clearing
BUF will make packet_ok disable the packet. */
if (!support_s || !support_S || !support_c || !support_C)
buf[0] = 0;
}
packet_ok (buf, &remote_protocol_packets[PACKET_vCont]);
}
/* Helper function for building "vCont" resumptions. Write a
resumption to P. ENDP points to one-passed-the-end of the buffer
we're allowed to write to. Returns BUF+CHARACTERS_WRITTEN. The
thread to be resumed is PTID; STEP and SIGGNAL indicate whether the
resumed thread should be single-stepped and/or signalled. If PTID
equals minus_one_ptid, then all threads are resumed; if PTID
represents a process, then all threads of the process are resumed;
the thread to be stepped and/or signalled is given in the global
INFERIOR_PTID. */
static char *
append_resumption (char *p, char *endp,
ptid_t ptid, int step, enum target_signal siggnal)
{
struct remote_state *rs = get_remote_state ();
if (step && siggnal != TARGET_SIGNAL_0)
p += xsnprintf (p, endp - p, ";S%02x", siggnal);
else if (step)
p += xsnprintf (p, endp - p, ";s");
else if (siggnal != TARGET_SIGNAL_0)
p += xsnprintf (p, endp - p, ";C%02x", siggnal);
else
p += xsnprintf (p, endp - p, ";c");
if (remote_multi_process_p (rs) && ptid_is_pid (ptid))
{
ptid_t nptid;
/* All (-1) threads of process. */
nptid = ptid_build (ptid_get_pid (ptid), 0, -1);
p += xsnprintf (p, endp - p, ":");
p = write_ptid (p, endp, nptid);
}
else if (!ptid_equal (ptid, minus_one_ptid))
{
p += xsnprintf (p, endp - p, ":");
p = write_ptid (p, endp, ptid);
}
return p;
}
/* Resume the remote inferior by using a "vCont" packet. The thread
to be resumed is PTID; STEP and SIGGNAL indicate whether the
resumed thread should be single-stepped and/or signalled. If PTID
equals minus_one_ptid, then all threads are resumed; the thread to
be stepped and/or signalled is given in the global INFERIOR_PTID.
This function returns non-zero iff it resumes the inferior.
This function issues a strict subset of all possible vCont commands at the
moment. */
static int
remote_vcont_resume (ptid_t ptid, int step, enum target_signal siggnal)
{
struct remote_state *rs = get_remote_state ();
char *p;
char *endp;
if (remote_protocol_packets[PACKET_vCont].support == PACKET_SUPPORT_UNKNOWN)
remote_vcont_probe (rs);
if (remote_protocol_packets[PACKET_vCont].support == PACKET_DISABLE)
return 0;
p = rs->buf;
endp = rs->buf + get_remote_packet_size ();
/* If we could generate a wider range of packets, we'd have to worry
about overflowing BUF. Should there be a generic
"multi-part-packet" packet? */
p += xsnprintf (p, endp - p, "vCont");
if (ptid_equal (ptid, magic_null_ptid))
{
/* MAGIC_NULL_PTID means that we don't have any active threads,
so we don't have any TID numbers the inferior will
understand. Make sure to only send forms that do not specify
a TID. */
append_resumption (p, endp, minus_one_ptid, step, siggnal);
}
else if (ptid_equal (ptid, minus_one_ptid) || ptid_is_pid (ptid))
{
/* Resume all threads (of all processes, or of a single
process), with preference for INFERIOR_PTID. This assumes
inferior_ptid belongs to the set of all threads we are about
to resume. */
if (step || siggnal != TARGET_SIGNAL_0)
{
/* Step inferior_ptid, with or without signal. */
p = append_resumption (p, endp, inferior_ptid, step, siggnal);
}
/* And continue others without a signal. */
append_resumption (p, endp, ptid, /*step=*/ 0, TARGET_SIGNAL_0);
}
else
{
/* Scheduler locking; resume only PTID. */
append_resumption (p, endp, ptid, step, siggnal);
}
gdb_assert (strlen (rs->buf) < get_remote_packet_size ());
putpkt (rs->buf);
if (non_stop)
{
/* In non-stop, the stub replies to vCont with "OK". The stop
reply will be reported asynchronously by means of a `%Stop'
notification. */
getpkt (&rs->buf, &rs->buf_size, 0);
if (strcmp (rs->buf, "OK") != 0)
error (_("Unexpected vCont reply in non-stop mode: %s"), rs->buf);
}
return 1;
}
/* Tell the remote machine to resume. */
static enum target_signal last_sent_signal = TARGET_SIGNAL_0;
static int last_sent_step;
static void
remote_resume (struct target_ops *ops,
ptid_t ptid, int step, enum target_signal siggnal)
{
struct remote_state *rs = get_remote_state ();
char *buf;
last_sent_signal = siggnal;
last_sent_step = step;
/* The vCont packet doesn't need to specify threads via Hc. */
/* No reverse support (yet) for vCont. */
if (execution_direction != EXEC_REVERSE)
if (remote_vcont_resume (ptid, step, siggnal))
goto done;
/* All other supported resume packets do use Hc, so set the continue
thread. */
if (ptid_equal (ptid, minus_one_ptid))
set_continue_thread (any_thread_ptid);
else
set_continue_thread (ptid);
buf = rs->buf;
if (execution_direction == EXEC_REVERSE)
{
/* We don't pass signals to the target in reverse exec mode. */
if (info_verbose && siggnal != TARGET_SIGNAL_0)
warning (_(" - Can't pass signal %d to target in reverse: ignored."),
siggnal);
if (step
&& remote_protocol_packets[PACKET_bs].support == PACKET_DISABLE)
error (_("Remote reverse-step not supported."));
if (!step
&& remote_protocol_packets[PACKET_bc].support == PACKET_DISABLE)
error (_("Remote reverse-continue not supported."));
strcpy (buf, step ? "bs" : "bc");
}
else if (siggnal != TARGET_SIGNAL_0)
{
buf[0] = step ? 'S' : 'C';
buf[1] = tohex (((int) siggnal >> 4) & 0xf);
buf[2] = tohex (((int) siggnal) & 0xf);
buf[3] = '\0';
}
else
strcpy (buf, step ? "s" : "c");
putpkt (buf);
done:
/* We are about to start executing the inferior, let's register it
with the event loop. NOTE: this is the one place where all the
execution commands end up. We could alternatively do this in each
of the execution commands in infcmd.c. */
/* FIXME: ezannoni 1999-09-28: We may need to move this out of here
into infcmd.c in order to allow inferior function calls to work
NOT asynchronously. */
if (target_can_async_p ())
target_async (inferior_event_handler, 0);
/* We've just told the target to resume. The remote server will
wait for the inferior to stop, and then send a stop reply. In
the mean time, we can't start another command/query ourselves
because the stub wouldn't be ready to process it. This applies
only to the base all-stop protocol, however. In non-stop (which
only supports vCont), the stub replies with an "OK", and is
immediate able to process further serial input. */
if (!non_stop)
rs->waiting_for_stop_reply = 1;
}
/* Set up the signal handler for SIGINT, while the target is
executing, ovewriting the 'regular' SIGINT signal handler. */
static void
initialize_sigint_signal_handler (void)
{
signal (SIGINT, handle_remote_sigint);
}
/* Signal handler for SIGINT, while the target is executing. */
static void
handle_remote_sigint (int sig)
{
signal (sig, handle_remote_sigint_twice);
mark_async_signal_handler_wrapper (sigint_remote_token);
}
/* Signal handler for SIGINT, installed after SIGINT has already been
sent once. It will take effect the second time that the user sends
a ^C. */
static void
handle_remote_sigint_twice (int sig)
{
signal (sig, handle_remote_sigint);
mark_async_signal_handler_wrapper (sigint_remote_twice_token);
}
/* Perform the real interruption of the target execution, in response
to a ^C. */
static void
async_remote_interrupt (gdb_client_data arg)
{
if (remote_debug)
fprintf_unfiltered (gdb_stdlog, "remote_interrupt called\n");
target_stop (inferior_ptid);
}
/* Perform interrupt, if the first attempt did not succeed. Just give
up on the target alltogether. */
void
async_remote_interrupt_twice (gdb_client_data arg)
{
if (remote_debug)
fprintf_unfiltered (gdb_stdlog, "remote_interrupt_twice called\n");
interrupt_query ();
}
/* Reinstall the usual SIGINT handlers, after the target has
stopped. */
static void
cleanup_sigint_signal_handler (void *dummy)
{
signal (SIGINT, handle_sigint);
}
/* Send ^C to target to halt it. Target will respond, and send us a
packet. */
static void (*ofunc) (int);
/* The command line interface's stop routine. This function is installed
as a signal handler for SIGINT. The first time a user requests a
stop, we call remote_stop to send a break or ^C. If there is no
response from the target (it didn't stop when the user requested it),
we ask the user if he'd like to detach from the target. */
static void
remote_interrupt (int signo)
{
/* If this doesn't work, try more severe steps. */
signal (signo, remote_interrupt_twice);
gdb_call_async_signal_handler (sigint_remote_token, 1);
}
/* The user typed ^C twice. */
static void
remote_interrupt_twice (int signo)
{
signal (signo, ofunc);
gdb_call_async_signal_handler (sigint_remote_twice_token, 1);
signal (signo, remote_interrupt);
}
/* Non-stop version of target_stop. Uses `vCont;t' to stop a remote
thread, all threads of a remote process, or all threads of all
processes. */
static void
remote_stop_ns (ptid_t ptid)
{
struct remote_state *rs = get_remote_state ();
char *p = rs->buf;
char *endp = rs->buf + get_remote_packet_size ();
if (remote_protocol_packets[PACKET_vCont].support == PACKET_SUPPORT_UNKNOWN)
remote_vcont_probe (rs);
if (!rs->support_vCont_t)
error (_("Remote server does not support stopping threads"));
if (ptid_equal (ptid, minus_one_ptid)
|| (!remote_multi_process_p (rs) && ptid_is_pid (ptid)))
p += xsnprintf (p, endp - p, "vCont;t");
else
{
ptid_t nptid;
p += xsnprintf (p, endp - p, "vCont;t:");
if (ptid_is_pid (ptid))
/* All (-1) threads of process. */
nptid = ptid_build (ptid_get_pid (ptid), 0, -1);
else
{
/* Small optimization: if we already have a stop reply for
this thread, no use in telling the stub we want this
stopped. */
if (peek_stop_reply (ptid))
return;
nptid = ptid;
}
write_ptid (p, endp, nptid);
}
/* In non-stop, we get an immediate OK reply. The stop reply will
come in asynchronously by notification. */
putpkt (rs->buf);
getpkt (&rs->buf, &rs->buf_size, 0);
if (strcmp (rs->buf, "OK") != 0)
error (_("Stopping %s failed: %s"), target_pid_to_str (ptid), rs->buf);
}
/* All-stop version of target_stop. Sends a break or a ^C to stop the
remote target. It is undefined which thread of which process
reports the stop. */
static void
remote_stop_as (ptid_t ptid)
{
struct remote_state *rs = get_remote_state ();
rs->ctrlc_pending_p = 1;
/* If the inferior is stopped already, but the core didn't know
about it yet, just ignore the request. The cached wait status
will be collected in remote_wait. */
if (rs->cached_wait_status)
return;
/* Send interrupt_sequence to remote target. */
send_interrupt_sequence ();
}
/* This is the generic stop called via the target vector. When a target
interrupt is requested, either by the command line or the GUI, we
will eventually end up here. */
static void
remote_stop (ptid_t ptid)
{
if (remote_debug)
fprintf_unfiltered (gdb_stdlog, "remote_stop called\n");
if (non_stop)
remote_stop_ns (ptid);
else
remote_stop_as (ptid);
}
/* Ask the user what to do when an interrupt is received. */
static void
interrupt_query (void)
{
target_terminal_ours ();
if (target_can_async_p ())
{
signal (SIGINT, handle_sigint);
deprecated_throw_reason (RETURN_QUIT);
}
else
{
if (query (_("Interrupted while waiting for the program.\n\
Give up (and stop debugging it)? ")))
{
pop_target ();
deprecated_throw_reason (RETURN_QUIT);
}
}
target_terminal_inferior ();
}
/* Enable/disable target terminal ownership. Most targets can use
terminal groups to control terminal ownership. Remote targets are
different in that explicit transfer of ownership to/from GDB/target
is required. */
static void
remote_terminal_inferior (void)
{
if (!target_async_permitted)
/* Nothing to do. */
return;
/* FIXME: cagney/1999-09-27: Make calls to target_terminal_*()
idempotent. The event-loop GDB talking to an asynchronous target
with a synchronous command calls this function from both
event-top.c and infrun.c/infcmd.c. Once GDB stops trying to
transfer the terminal to the target when it shouldn't this guard
can go away. */
if (!remote_async_terminal_ours_p)
return;
delete_file_handler (input_fd);
remote_async_terminal_ours_p = 0;
initialize_sigint_signal_handler ();
/* NOTE: At this point we could also register our selves as the
recipient of all input. Any characters typed could then be
passed on down to the target. */
}
static void
remote_terminal_ours (void)
{
if (!target_async_permitted)
/* Nothing to do. */
return;
/* See FIXME in remote_terminal_inferior. */
if (remote_async_terminal_ours_p)
return;
cleanup_sigint_signal_handler (NULL);
add_file_handler (input_fd, stdin_event_handler, 0);
remote_async_terminal_ours_p = 1;
}
static void
remote_console_output (char *msg)
{
char *p;
for (p = msg; p[0] && p[1]; p += 2)
{
char tb[2];
char c = fromhex (p[0]) * 16 + fromhex (p[1]);
tb[0] = c;
tb[1] = 0;
fputs_unfiltered (tb, gdb_stdtarg);
}
gdb_flush (gdb_stdtarg);
}
typedef struct cached_reg
{
int num;
gdb_byte data[MAX_REGISTER_SIZE];
} cached_reg_t;
DEF_VEC_O(cached_reg_t);
struct stop_reply
{
struct stop_reply *next;
ptid_t ptid;
struct target_waitstatus ws;
/* Expedited registers. This makes remote debugging a bit more
efficient for those targets that provide critical registers as
part of their normal status mechanism (as another roundtrip to
fetch them is avoided). */
VEC(cached_reg_t) *regcache;
int stopped_by_watchpoint_p;
CORE_ADDR watch_data_address;
int solibs_changed;
int replay_event;
int core;
};
/* The list of already fetched and acknowledged stop events. */
static struct stop_reply *stop_reply_queue;
static struct stop_reply *
stop_reply_xmalloc (void)
{
struct stop_reply *r = XMALLOC (struct stop_reply);
r->next = NULL;
return r;
}
static void
stop_reply_xfree (struct stop_reply *r)
{
if (r != NULL)
{
VEC_free (cached_reg_t, r->regcache);
xfree (r);
}
}
/* Discard all pending stop replies of inferior PID. If PID is -1,
discard everything. */
static void
discard_pending_stop_replies (int pid)
{
struct stop_reply *prev = NULL, *reply, *next;
/* Discard the in-flight notification. */
if (pending_stop_reply != NULL
&& (pid == -1
|| ptid_get_pid (pending_stop_reply->ptid) == pid))
{
stop_reply_xfree (pending_stop_reply);
pending_stop_reply = NULL;
}
/* Discard the stop replies we have already pulled with
vStopped. */
for (reply = stop_reply_queue; reply; reply = next)
{
next = reply->next;
if (pid == -1
|| ptid_get_pid (reply->ptid) == pid)
{
if (reply == stop_reply_queue)
stop_reply_queue = reply->next;
else
prev->next = reply->next;
stop_reply_xfree (reply);
}
else
prev = reply;
}
}
/* Cleanup wrapper. */
static void
do_stop_reply_xfree (void *arg)
{
struct stop_reply *r = arg;
stop_reply_xfree (r);
}
/* Look for a queued stop reply belonging to PTID. If one is found,
remove it from the queue, and return it. Returns NULL if none is
found. If there are still queued events left to process, tell the
event loop to get back to target_wait soon. */
static struct stop_reply *
queued_stop_reply (ptid_t ptid)
{
struct stop_reply *it;
struct stop_reply **it_link;
it = stop_reply_queue;
it_link = &stop_reply_queue;
while (it)
{
if (ptid_match (it->ptid, ptid))
{
*it_link = it->next;
it->next = NULL;
break;
}
it_link = &it->next;
it = *it_link;
}
if (stop_reply_queue)
/* There's still at least an event left. */
mark_async_event_handler (remote_async_inferior_event_token);
return it;
}
/* Push a fully parsed stop reply in the stop reply queue. Since we
know that we now have at least one queued event left to pass to the
core side, tell the event loop to get back to target_wait soon. */
static void
push_stop_reply (struct stop_reply *new_event)
{
struct stop_reply *event;
if (stop_reply_queue)
{
for (event = stop_reply_queue;
event && event->next;
event = event->next)
;
event->next = new_event;
}
else
stop_reply_queue = new_event;
mark_async_event_handler (remote_async_inferior_event_token);
}
/* Returns true if we have a stop reply for PTID. */
static int
peek_stop_reply (ptid_t ptid)
{
struct stop_reply *it;
for (it = stop_reply_queue; it; it = it->next)
if (ptid_equal (ptid, it->ptid))
{
if (it->ws.kind == TARGET_WAITKIND_STOPPED)
return 1;
}
return 0;
}
/* Parse the stop reply in BUF. Either the function succeeds, and the
result is stored in EVENT, or throws an error. */
static void
remote_parse_stop_reply (char *buf, struct stop_reply *event)
{
struct remote_arch_state *rsa = get_remote_arch_state ();
ULONGEST addr;
char *p;
event->ptid = null_ptid;
event->ws.kind = TARGET_WAITKIND_IGNORE;
event->ws.value.integer = 0;
event->solibs_changed = 0;
event->replay_event = 0;
event->stopped_by_watchpoint_p = 0;
event->regcache = NULL;
event->core = -1;
switch (buf[0])
{
case 'T': /* Status with PC, SP, FP, ... */
/* Expedited reply, containing Signal, {regno, reg} repeat. */
/* format is: 'Tssn...:r...;n...:r...;n...:r...;#cc', where
ss = signal number
n... = register number
r... = register contents
*/
p = &buf[3]; /* after Txx */
while (*p)
{
char *p1;
char *p_temp;
int fieldsize;
LONGEST pnum = 0;
/* If the packet contains a register number, save it in
pnum and set p1 to point to the character following it.
Otherwise p1 points to p. */
/* If this packet is an awatch packet, don't parse the 'a'
as a register number. */
if (strncmp (p, "awatch", strlen("awatch")) != 0
&& strncmp (p, "core", strlen ("core") != 0))
{
/* Read the ``P'' register number. */
pnum = strtol (p, &p_temp, 16);
p1 = p_temp;
}
else
p1 = p;
if (p1 == p) /* No register number present here. */
{
p1 = strchr (p, ':');
if (p1 == NULL)
error (_("Malformed packet(a) (missing colon): %s\n\
Packet: '%s'\n"),
p, buf);
if (strncmp (p, "thread", p1 - p) == 0)
event->ptid = read_ptid (++p1, &p);
else if ((strncmp (p, "watch", p1 - p) == 0)
|| (strncmp (p, "rwatch", p1 - p) == 0)
|| (strncmp (p, "awatch", p1 - p) == 0))
{
event->stopped_by_watchpoint_p = 1;
p = unpack_varlen_hex (++p1, &addr);
event->watch_data_address = (CORE_ADDR) addr;
}
else if (strncmp (p, "library", p1 - p) == 0)
{
p1++;
p_temp = p1;
while (*p_temp && *p_temp != ';')
p_temp++;
event->solibs_changed = 1;
p = p_temp;
}
else if (strncmp (p, "replaylog", p1 - p) == 0)
{
/* NO_HISTORY event.
p1 will indicate "begin" or "end", but
it makes no difference for now, so ignore it. */
event->replay_event = 1;
p_temp = strchr (p1 + 1, ';');
if (p_temp)
p = p_temp;
}
else if (strncmp (p, "core", p1 - p) == 0)
{
ULONGEST c;
p = unpack_varlen_hex (++p1, &c);
event->core = c;
}
else
{
/* Silently skip unknown optional info. */
p_temp = strchr (p1 + 1, ';');
if (p_temp)
p = p_temp;
}
}
else
{
struct packet_reg *reg = packet_reg_from_pnum (rsa, pnum);
cached_reg_t cached_reg;
p = p1;
if (*p != ':')
error (_("Malformed packet(b) (missing colon): %s\n\
Packet: '%s'\n"),
p, buf);
++p;
if (reg == NULL)
error (_("Remote sent bad register number %s: %s\n\
Packet: '%s'\n"),
hex_string (pnum), p, buf);
cached_reg.num = reg->regnum;
fieldsize = hex2bin (p, cached_reg.data,
register_size (target_gdbarch,
reg->regnum));
p += 2 * fieldsize;
if (fieldsize < register_size (target_gdbarch,
reg->regnum))
warning (_("Remote reply is too short: %s"), buf);
VEC_safe_push (cached_reg_t, event->regcache, &cached_reg);
}
if (*p != ';')
error (_("Remote register badly formatted: %s\nhere: %s"),
buf, p);
++p;
}
/* fall through */
case 'S': /* Old style status, just signal only. */
if (event->solibs_changed)
event->ws.kind = TARGET_WAITKIND_LOADED;
else if (event->replay_event)
event->ws.kind = TARGET_WAITKIND_NO_HISTORY;
else
{
event->ws.kind = TARGET_WAITKIND_STOPPED;
event->ws.value.sig = (enum target_signal)
(((fromhex (buf[1])) << 4) + (fromhex (buf[2])));
}
break;
case 'W': /* Target exited. */
case 'X':
{
char *p;
int pid;
ULONGEST value;
/* GDB used to accept only 2 hex chars here. Stubs should
only send more if they detect GDB supports multi-process
support. */
p = unpack_varlen_hex (&buf[1], &value);
if (buf[0] == 'W')
{
/* The remote process exited. */
event->ws.kind = TARGET_WAITKIND_EXITED;
event->ws.value.integer = value;
}
else
{
/* The remote process exited with a signal. */
event->ws.kind = TARGET_WAITKIND_SIGNALLED;
event->ws.value.sig = (enum target_signal) value;
}
/* If no process is specified, assume inferior_ptid. */
pid = ptid_get_pid (inferior_ptid);
if (*p == '\0')
;
else if (*p == ';')
{
p++;
if (p == '\0')
;
else if (strncmp (p,
"process:", sizeof ("process:") - 1) == 0)
{
ULONGEST upid;
p += sizeof ("process:") - 1;
unpack_varlen_hex (p, &upid);
pid = upid;
}
else
error (_("unknown stop reply packet: %s"), buf);
}
else
error (_("unknown stop reply packet: %s"), buf);
event->ptid = pid_to_ptid (pid);
}
break;
}
if (non_stop && ptid_equal (event->ptid, null_ptid))
error (_("No process or thread specified in stop reply: %s"), buf);
}
/* When the stub wants to tell GDB about a new stop reply, it sends a
stop notification (%Stop). Those can come it at any time, hence,
we have to make sure that any pending putpkt/getpkt sequence we're
making is finished, before querying the stub for more events with
vStopped. E.g., if we started a vStopped sequence immediatelly
upon receiving the %Stop notification, something like this could
happen:
1.1) --> Hg 1
1.2) <-- OK
1.3) --> g
1.4) <-- %Stop
1.5) --> vStopped
1.6) <-- (registers reply to step #1.3)
Obviously, the reply in step #1.6 would be unexpected to a vStopped
query.
To solve this, whenever we parse a %Stop notification sucessfully,
we mark the REMOTE_ASYNC_GET_PENDING_EVENTS_TOKEN, and carry on
doing whatever we were doing:
2.1) --> Hg 1
2.2) <-- OK
2.3) --> g
2.4) <-- %Stop
<GDB marks the REMOTE_ASYNC_GET_PENDING_EVENTS_TOKEN>
2.5) <-- (registers reply to step #2.3)
Eventualy after step #2.5, we return to the event loop, which
notices there's an event on the
REMOTE_ASYNC_GET_PENDING_EVENTS_TOKEN event and calls the
associated callback --- the function below. At this point, we're
always safe to start a vStopped sequence. :
2.6) --> vStopped
2.7) <-- T05 thread:2
2.8) --> vStopped
2.9) --> OK
*/
static void
remote_get_pending_stop_replies (void)
{
struct remote_state *rs = get_remote_state ();
if (pending_stop_reply)
{
/* acknowledge */
putpkt ("vStopped");
/* Now we can rely on it. */
push_stop_reply (pending_stop_reply);
pending_stop_reply = NULL;
while (1)
{
getpkt (&rs->buf, &rs->buf_size, 0);
if (strcmp (rs->buf, "OK") == 0)
break;
else
{
struct cleanup *old_chain;
struct stop_reply *stop_reply = stop_reply_xmalloc ();
old_chain = make_cleanup (do_stop_reply_xfree, stop_reply);
remote_parse_stop_reply (rs->buf, stop_reply);
/* acknowledge */
putpkt ("vStopped");
if (stop_reply->ws.kind != TARGET_WAITKIND_IGNORE)
{
/* Now we can rely on it. */
discard_cleanups (old_chain);
push_stop_reply (stop_reply);
}
else
/* We got an unknown stop reply. */
do_cleanups (old_chain);
}
}
}
}
/* Called when it is decided that STOP_REPLY holds the info of the
event that is to be returned to the core. This function always
destroys STOP_REPLY. */
static ptid_t
process_stop_reply (struct stop_reply *stop_reply,
struct target_waitstatus *status)
{
ptid_t ptid;
*status = stop_reply->ws;
ptid = stop_reply->ptid;
/* If no thread/process was reported by the stub, assume the current
inferior. */
if (ptid_equal (ptid, null_ptid))
ptid = inferior_ptid;
if (status->kind != TARGET_WAITKIND_EXITED
&& status->kind != TARGET_WAITKIND_SIGNALLED)
{
/* Expedited registers. */
if (stop_reply->regcache)
{
struct regcache *regcache
= get_thread_arch_regcache (ptid, target_gdbarch);
cached_reg_t *reg;
int ix;
for (ix = 0;
VEC_iterate(cached_reg_t, stop_reply->regcache, ix, reg);
ix++)
regcache_raw_supply (regcache, reg->num, reg->data);
VEC_free (cached_reg_t, stop_reply->regcache);
}
remote_stopped_by_watchpoint_p = stop_reply->stopped_by_watchpoint_p;
remote_watch_data_address = stop_reply->watch_data_address;
remote_notice_new_inferior (ptid, 0);
demand_private_info (ptid)->core = stop_reply->core;
}
stop_reply_xfree (stop_reply);
return ptid;
}
/* The non-stop mode version of target_wait. */
static ptid_t
remote_wait_ns (ptid_t ptid, struct target_waitstatus *status, int options)
{
struct remote_state *rs = get_remote_state ();
struct stop_reply *stop_reply;
int ret;
/* If in non-stop mode, get out of getpkt even if a
notification is received. */
ret = getpkt_or_notif_sane (&rs->buf, &rs->buf_size,
0 /* forever */);
while (1)
{
if (ret != -1)
switch (rs->buf[0])
{
case 'E': /* Error of some sort. */
/* We're out of sync with the target now. Did it continue
or not? We can't tell which thread it was in non-stop,
so just ignore this. */
warning (_("Remote failure reply: %s"), rs->buf);
break;
case 'O': /* Console output. */
remote_console_output (rs->buf + 1);
break;
default:
warning (_("Invalid remote reply: %s"), rs->buf);
break;
}
/* Acknowledge a pending stop reply that may have arrived in the
mean time. */
if (pending_stop_reply != NULL)
remote_get_pending_stop_replies ();
/* If indeed we noticed a stop reply, we're done. */
stop_reply = queued_stop_reply (ptid);
if (stop_reply != NULL)
return process_stop_reply (stop_reply, status);
/* Still no event. If we're just polling for an event, then
return to the event loop. */
if (options & TARGET_WNOHANG)
{
status->kind = TARGET_WAITKIND_IGNORE;
return minus_one_ptid;
}
/* Otherwise do a blocking wait. */
ret = getpkt_or_notif_sane (&rs->buf, &rs->buf_size,
1 /* forever */);
}
}
/* Wait until the remote machine stops, then return, storing status in
STATUS just as `wait' would. */
static ptid_t
remote_wait_as (ptid_t ptid, struct target_waitstatus *status, int options)
{
struct remote_state *rs = get_remote_state ();
ptid_t event_ptid = null_ptid;
char *buf;
struct stop_reply *stop_reply;
again:
status->kind = TARGET_WAITKIND_IGNORE;
status->value.integer = 0;
stop_reply = queued_stop_reply (ptid);
if (stop_reply != NULL)
return process_stop_reply (stop_reply, status);
if (rs->cached_wait_status)
/* Use the cached wait status, but only once. */
rs->cached_wait_status = 0;
else
{
int ret;
if (!target_is_async_p ())
{
ofunc = signal (SIGINT, remote_interrupt);
/* If the user hit C-c before this packet, or between packets,
pretend that it was hit right here. */
if (quit_flag)
{
quit_flag = 0;
remote_interrupt (SIGINT);
}
}
/* FIXME: cagney/1999-09-27: If we're in async mode we should
_never_ wait for ever -> test on target_is_async_p().
However, before we do that we need to ensure that the caller
knows how to take the target into/out of async mode. */
ret = getpkt_sane (&rs->buf, &rs->buf_size, wait_forever_enabled_p);
if (!target_is_async_p ())
signal (SIGINT, ofunc);
}
buf = rs->buf;
remote_stopped_by_watchpoint_p = 0;
/* We got something. */
rs->waiting_for_stop_reply = 0;
/* Assume that the target has acknowledged Ctrl-C unless we receive
an 'F' or 'O' packet. */
if (buf[0] != 'F' && buf[0] != 'O')
rs->ctrlc_pending_p = 0;
switch (buf[0])
{
case 'E': /* Error of some sort. */
/* We're out of sync with the target now. Did it continue or
not? Not is more likely, so report a stop. */
warning (_("Remote failure reply: %s"), buf);
status->kind = TARGET_WAITKIND_STOPPED;
status->value.sig = TARGET_SIGNAL_0;
break;
case 'F': /* File-I/O request. */
remote_fileio_request (buf, rs->ctrlc_pending_p);
rs->ctrlc_pending_p = 0;
break;
case 'T': case 'S': case 'X': case 'W':
{
struct stop_reply *stop_reply;
struct cleanup *old_chain;
stop_reply = stop_reply_xmalloc ();
old_chain = make_cleanup (do_stop_reply_xfree, stop_reply);
remote_parse_stop_reply (buf, stop_reply);
discard_cleanups (old_chain);
event_ptid = process_stop_reply (stop_reply, status);
break;
}
case 'O': /* Console output. */
remote_console_output (buf + 1);
/* The target didn't really stop; keep waiting. */
rs->waiting_for_stop_reply = 1;
break;
case '\0':
if (last_sent_signal != TARGET_SIGNAL_0)
{
/* Zero length reply means that we tried 'S' or 'C' and the
remote system doesn't support it. */
target_terminal_ours_for_output ();
printf_filtered
("Can't send signals to this remote system. %s not sent.\n",
target_signal_to_name (last_sent_signal));
last_sent_signal = TARGET_SIGNAL_0;
target_terminal_inferior ();
strcpy ((char *) buf, last_sent_step ? "s" : "c");
putpkt ((char *) buf);
/* We just told the target to resume, so a stop reply is in
order. */
rs->waiting_for_stop_reply = 1;
break;
}
/* else fallthrough */
default:
warning (_("Invalid remote reply: %s"), buf);
/* Keep waiting. */
rs->waiting_for_stop_reply = 1;
break;
}
if (status->kind == TARGET_WAITKIND_IGNORE)
{
/* Nothing interesting happened. If we're doing a non-blocking
poll, we're done. Otherwise, go back to waiting. */
if (options & TARGET_WNOHANG)
return minus_one_ptid;
else
goto again;
}
else if (status->kind != TARGET_WAITKIND_EXITED
&& status->kind != TARGET_WAITKIND_SIGNALLED)
{
if (!ptid_equal (event_ptid, null_ptid))
record_currthread (event_ptid);
else
event_ptid = inferior_ptid;
}
else
/* A process exit. Invalidate our notion of current thread. */
record_currthread (minus_one_ptid);
return event_ptid;
}
/* Wait until the remote machine stops, then return, storing status in
STATUS just as `wait' would. */
static ptid_t
remote_wait (struct target_ops *ops,
ptid_t ptid, struct target_waitstatus *status, int options)
{
ptid_t event_ptid;
if (non_stop)
event_ptid = remote_wait_ns (ptid, status, options);
else
event_ptid = remote_wait_as (ptid, status, options);
if (target_can_async_p ())
{
/* If there are are events left in the queue tell the event loop
to return here. */
if (stop_reply_queue)
mark_async_event_handler (remote_async_inferior_event_token);
}
return event_ptid;
}
/* Fetch a single register using a 'p' packet. */
static int
fetch_register_using_p (struct regcache *regcache, struct packet_reg *reg)
{
struct remote_state *rs = get_remote_state ();
char *buf, *p;
char regp[MAX_REGISTER_SIZE];
int i;
if (remote_protocol_packets[PACKET_p].support == PACKET_DISABLE)
return 0;
if (reg->pnum == -1)
return 0;
p = rs->buf;
*p++ = 'p';
p += hexnumstr (p, reg->pnum);
*p++ = '\0';
putpkt (rs->buf);
getpkt (&rs->buf, &rs->buf_size, 0);
buf = rs->buf;
switch (packet_ok (buf, &remote_protocol_packets[PACKET_p]))
{
case PACKET_OK:
break;
case PACKET_UNKNOWN:
return 0;
case PACKET_ERROR:
error (_("Could not fetch register \"%s\"; remote failure reply '%s'"),
gdbarch_register_name (get_regcache_arch (regcache),
reg->regnum),
buf);
}
/* If this register is unfetchable, tell the regcache. */
if (buf[0] == 'x')
{
regcache_raw_supply (regcache, reg->regnum, NULL);
return 1;
}
/* Otherwise, parse and supply the value. */
p = buf;
i = 0;
while (p[0] != 0)
{
if (p[1] == 0)
error (_("fetch_register_using_p: early buf termination"));
regp[i++] = fromhex (p[0]) * 16 + fromhex (p[1]);
p += 2;
}
regcache_raw_supply (regcache, reg->regnum, regp);
return 1;
}
/* Fetch the registers included in the target's 'g' packet. */
static int
send_g_packet (void)
{
struct remote_state *rs = get_remote_state ();
int buf_len;
sprintf (rs->buf, "g");
remote_send (&rs->buf, &rs->buf_size);
/* We can get out of synch in various cases. If the first character
in the buffer is not a hex character, assume that has happened
and try to fetch another packet to read. */
while ((rs->buf[0] < '0' || rs->buf[0] > '9')
&& (rs->buf[0] < 'A' || rs->buf[0] > 'F')
&& (rs->buf[0] < 'a' || rs->buf[0] > 'f')
&& rs->buf[0] != 'x') /* New: unavailable register value. */
{
if (remote_debug)
fprintf_unfiltered (gdb_stdlog,
"Bad register packet; fetching a new packet\n");
getpkt (&rs->buf, &rs->buf_size, 0);
}
buf_len = strlen (rs->buf);
/* Sanity check the received packet. */
if (buf_len % 2 != 0)
error (_("Remote 'g' packet reply is of odd length: %s"), rs->buf);
return buf_len / 2;
}
static void
process_g_packet (struct regcache *regcache)
{
struct gdbarch *gdbarch = get_regcache_arch (regcache);
struct remote_state *rs = get_remote_state ();
struct remote_arch_state *rsa = get_remote_arch_state ();
int i, buf_len;
char *p;
char *regs;
buf_len = strlen (rs->buf);
/* Further sanity checks, with knowledge of the architecture. */
if (buf_len > 2 * rsa->sizeof_g_packet)
error (_("Remote 'g' packet reply is too long: %s"), rs->buf);
/* Save the size of the packet sent to us by the target. It is used
as a heuristic when determining the max size of packets that the
target can safely receive. */
if (rsa->actual_register_packet_size == 0)
rsa->actual_register_packet_size = buf_len;
/* If this is smaller than we guessed the 'g' packet would be,
update our records. A 'g' reply that doesn't include a register's
value implies either that the register is not available, or that
the 'p' packet must be used. */
if (buf_len < 2 * rsa->sizeof_g_packet)
{
rsa->sizeof_g_packet = buf_len / 2;
for (i = 0; i < gdbarch_num_regs (gdbarch); i++)
{
if (rsa->regs[i].pnum == -1)
continue;
if (rsa->regs[i].offset >= rsa->sizeof_g_packet)
rsa->regs[i].in_g_packet = 0;
else
rsa->regs[i].in_g_packet = 1;
}
}
regs = alloca (rsa->sizeof_g_packet);
/* Unimplemented registers read as all bits zero. */
memset (regs, 0, rsa->sizeof_g_packet);
/* Reply describes registers byte by byte, each byte encoded as two
hex characters. Suck them all up, then supply them to the
register cacheing/storage mechanism. */
p = rs->buf;
for (i = 0; i < rsa->sizeof_g_packet; i++)
{
if (p[0] == 0 || p[1] == 0)
/* This shouldn't happen - we adjusted sizeof_g_packet above. */
internal_error (__FILE__, __LINE__,
_("unexpected end of 'g' packet reply"));
if (p[0] == 'x' && p[1] == 'x')
regs[i] = 0; /* 'x' */
else
regs[i] = fromhex (p[0]) * 16 + fromhex (p[1]);
p += 2;
}
for (i = 0; i < gdbarch_num_regs (gdbarch); i++)
{
struct packet_reg *r = &rsa->regs[i];
if (r->in_g_packet)
{
if (r->offset * 2 >= strlen (rs->buf))
/* This shouldn't happen - we adjusted in_g_packet above. */
internal_error (__FILE__, __LINE__,
_("unexpected end of 'g' packet reply"));
else if (rs->buf[r->offset * 2] == 'x')
{
gdb_assert (r->offset * 2 < strlen (rs->buf));
/* The register isn't available, mark it as such (at
the same time setting the value to zero). */
regcache_raw_supply (regcache, r->regnum, NULL);
}
else
regcache_raw_supply (regcache, r->regnum,
regs + r->offset);
}
}
}
static void
fetch_registers_using_g (struct regcache *regcache)
{
send_g_packet ();
process_g_packet (regcache);
}
/* Make the remote selected traceframe match GDB's selected
traceframe. */
static void
set_remote_traceframe (void)
{
int newnum;
if (remote_traceframe_number == get_traceframe_number ())
return;
/* Avoid recursion, remote_trace_find calls us again. */
remote_traceframe_number = get_traceframe_number ();
newnum = target_trace_find (tfind_number,
get_traceframe_number (), 0, 0, NULL);
/* Should not happen. If it does, all bets are off. */
if (newnum != get_traceframe_number ())
warning (_("could not set remote traceframe"));
}
static void
remote_fetch_registers (struct target_ops *ops,
struct regcache *regcache, int regnum)
{
struct remote_arch_state *rsa = get_remote_arch_state ();
int i;
set_remote_traceframe ();
set_general_thread (inferior_ptid);
if (regnum >= 0)
{
struct packet_reg *reg = packet_reg_from_regnum (rsa, regnum);
gdb_assert (reg != NULL);
/* If this register might be in the 'g' packet, try that first -
we are likely to read more than one register. If this is the
first 'g' packet, we might be overly optimistic about its
contents, so fall back to 'p'. */
if (reg->in_g_packet)
{
fetch_registers_using_g (regcache);
if (reg->in_g_packet)
return;
}
if (fetch_register_using_p (regcache, reg))
return;
/* This register is not available. */
regcache_raw_supply (regcache, reg->regnum, NULL);
return;
}
fetch_registers_using_g (regcache);
for (i = 0; i < gdbarch_num_regs (get_regcache_arch (regcache)); i++)
if (!rsa->regs[i].in_g_packet)
if (!fetch_register_using_p (regcache, &rsa->regs[i]))
{
/* This register is not available. */
regcache_raw_supply (regcache, i, NULL);
}
}
/* Prepare to store registers. Since we may send them all (using a
'G' request), we have to read out the ones we don't want to change
first. */
static void
remote_prepare_to_store (struct regcache *regcache)
{
struct remote_arch_state *rsa = get_remote_arch_state ();
int i;
gdb_byte buf[MAX_REGISTER_SIZE];
/* Make sure the entire registers array is valid. */
switch (remote_protocol_packets[PACKET_P].support)
{
case PACKET_DISABLE:
case PACKET_SUPPORT_UNKNOWN:
/* Make sure all the necessary registers are cached. */
for (i = 0; i < gdbarch_num_regs (get_regcache_arch (regcache)); i++)
if (rsa->regs[i].in_g_packet)
regcache_raw_read (regcache, rsa->regs[i].regnum, buf);
break;
case PACKET_ENABLE:
break;
}
}
/* Helper: Attempt to store REGNUM using the P packet. Return fail IFF
packet was not recognized. */
static int
store_register_using_P (const struct regcache *regcache,
struct packet_reg *reg)
{
struct gdbarch *gdbarch = get_regcache_arch (regcache);
struct remote_state *rs = get_remote_state ();
/* Try storing a single register. */
char *buf = rs->buf;
gdb_byte regp[MAX_REGISTER_SIZE];
char *p;
if (remote_protocol_packets[PACKET_P].support == PACKET_DISABLE)
return 0;
if (reg->pnum == -1)
return 0;
xsnprintf (buf, get_remote_packet_size (), "P%s=", phex_nz (reg->pnum, 0));
p = buf + strlen (buf);
regcache_raw_collect (regcache, reg->regnum, regp);
bin2hex (regp, p, register_size (gdbarch, reg->regnum));
putpkt (rs->buf);
getpkt (&rs->buf, &rs->buf_size, 0);
switch (packet_ok (rs->buf, &remote_protocol_packets[PACKET_P]))
{
case PACKET_OK:
return 1;
case PACKET_ERROR:
error (_("Could not write register \"%s\"; remote failure reply '%s'"),
gdbarch_register_name (gdbarch, reg->regnum), rs->buf);
case PACKET_UNKNOWN:
return 0;
default:
internal_error (__FILE__, __LINE__, _("Bad result from packet_ok"));
}
}
/* Store register REGNUM, or all registers if REGNUM == -1, from the
contents of the register cache buffer. FIXME: ignores errors. */
static void
store_registers_using_G (const struct regcache *regcache)
{
struct remote_state *rs = get_remote_state ();
struct remote_arch_state *rsa = get_remote_arch_state ();
gdb_byte *regs;
char *p;
/* Extract all the registers in the regcache copying them into a
local buffer. */
{
int i;
regs = alloca (rsa->sizeof_g_packet);
memset (regs, 0, rsa->sizeof_g_packet);
for (i = 0; i < gdbarch_num_regs (get_regcache_arch (regcache)); i++)
{
struct packet_reg *r = &rsa->regs[i];
if (r->in_g_packet)
regcache_raw_collect (regcache, r->regnum, regs + r->offset);
}
}
/* Command describes registers byte by byte,
each byte encoded as two hex characters. */
p = rs->buf;
*p++ = 'G';
/* remote_prepare_to_store insures that rsa->sizeof_g_packet gets
updated. */
bin2hex (regs, p, rsa->sizeof_g_packet);
putpkt (rs->buf);
getpkt (&rs->buf, &rs->buf_size, 0);
if (packet_check_result (rs->buf) == PACKET_ERROR)
error (_("Could not write registers; remote failure reply '%s'"),
rs->buf);
}
/* Store register REGNUM, or all registers if REGNUM == -1, from the contents
of the register cache buffer. FIXME: ignores errors. */
static void
remote_store_registers (struct target_ops *ops,
struct regcache *regcache, int regnum)
{
struct remote_arch_state *rsa = get_remote_arch_state ();
int i;
set_remote_traceframe ();
set_general_thread (inferior_ptid);
if (regnum >= 0)
{
struct packet_reg *reg = packet_reg_from_regnum (rsa, regnum);
gdb_assert (reg != NULL);
/* Always prefer to store registers using the 'P' packet if
possible; we often change only a small number of registers.
Sometimes we change a larger number; we'd need help from a
higher layer to know to use 'G'. */
if (store_register_using_P (regcache, reg))
return;
/* For now, don't complain if we have no way to write the
register. GDB loses track of unavailable registers too
easily. Some day, this may be an error. We don't have
any way to read the register, either... */
if (!reg->in_g_packet)
return;
store_registers_using_G (regcache);
return;
}
store_registers_using_G (regcache);
for (i = 0; i < gdbarch_num_regs (get_regcache_arch (regcache)); i++)
if (!rsa->regs[i].in_g_packet)
if (!store_register_using_P (regcache, &rsa->regs[i]))
/* See above for why we do not issue an error here. */
continue;
}
/* Return the number of hex digits in num. */
static int
hexnumlen (ULONGEST num)
{
int i;
for (i = 0; num != 0; i++)
num >>= 4;
return max (i, 1);
}
/* Set BUF to the minimum number of hex digits representing NUM. */
static int
hexnumstr (char *buf, ULONGEST num)
{
int len = hexnumlen (num);
return hexnumnstr (buf, num, len);
}
/* Set BUF to the hex digits representing NUM, padded to WIDTH characters. */
static int
hexnumnstr (char *buf, ULONGEST num, int width)
{
int i;
buf[width] = '\0';
for (i = width - 1; i >= 0; i--)
{
buf[i] = "0123456789abcdef"[(num & 0xf)];
num >>= 4;
}
return width;
}
/* Mask all but the least significant REMOTE_ADDRESS_SIZE bits. */
static CORE_ADDR
remote_address_masked (CORE_ADDR addr)
{
int address_size = remote_address_size;
/* If "remoteaddresssize" was not set, default to target address size. */
if (!address_size)
address_size = gdbarch_addr_bit (target_gdbarch);
if (address_size > 0
&& address_size < (sizeof (ULONGEST) * 8))
{
/* Only create a mask when that mask can safely be constructed
in a ULONGEST variable. */
ULONGEST mask = 1;
mask = (mask << address_size) - 1;
addr &= mask;
}
return addr;
}
/* Convert BUFFER, binary data at least LEN bytes long, into escaped
binary data in OUT_BUF. Set *OUT_LEN to the length of the data
encoded in OUT_BUF, and return the number of bytes in OUT_BUF
(which may be more than *OUT_LEN due to escape characters). The
total number of bytes in the output buffer will be at most
OUT_MAXLEN. */
static int
remote_escape_output (const gdb_byte *buffer, int len,
gdb_byte *out_buf, int *out_len,
int out_maxlen)
{
int input_index, output_index;
output_index = 0;
for (input_index = 0; input_index < len; input_index++)
{
gdb_byte b = buffer[input_index];
if (b == '$' || b == '#' || b == '}')
{
/* These must be escaped. */
if (output_index + 2 > out_maxlen)
break;
out_buf[output_index++] = '}';
out_buf[output_index++] = b ^ 0x20;
}
else
{
if (output_index + 1 > out_maxlen)
break;
out_buf[output_index++] = b;
}
}
*out_len = input_index;
return output_index;
}
/* Convert BUFFER, escaped data LEN bytes long, into binary data
in OUT_BUF. Return the number of bytes written to OUT_BUF.
Raise an error if the total number of bytes exceeds OUT_MAXLEN.
This function reverses remote_escape_output. It allows more
escaped characters than that function does, in particular because
'*' must be escaped to avoid the run-length encoding processing
in reading packets. */
static int
remote_unescape_input (const gdb_byte *buffer, int len,
gdb_byte *out_buf, int out_maxlen)
{
int input_index, output_index;
int escaped;
output_index = 0;
escaped = 0;
for (input_index = 0; input_index < len; input_index++)
{
gdb_byte b = buffer[input_index];
if (output_index + 1 > out_maxlen)
{
warning (_("Received too much data from remote target;"
" ignoring overflow."));
return output_index;
}
if (escaped)
{
out_buf[output_index++] = b ^ 0x20;
escaped = 0;
}
else if (b == '}')
escaped = 1;
else
out_buf[output_index++] = b;
}
if (escaped)
error (_("Unmatched escape character in target response."));
return output_index;
}
/* Determine whether the remote target supports binary downloading.
This is accomplished by sending a no-op memory write of zero length
to the target at the specified address. It does not suffice to send
the whole packet, since many stubs strip the eighth bit and
subsequently compute a wrong checksum, which causes real havoc with
remote_write_bytes.
NOTE: This can still lose if the serial line is not eight-bit
clean. In cases like this, the user should clear "remote
X-packet". */
static void
check_binary_download (CORE_ADDR addr)
{
struct remote_state *rs = get_remote_state ();
switch (remote_protocol_packets[PACKET_X].support)
{
case PACKET_DISABLE:
break;
case PACKET_ENABLE:
break;
case PACKET_SUPPORT_UNKNOWN:
{
char *p;
p = rs->buf;
*p++ = 'X';
p += hexnumstr (p, (ULONGEST) addr);
*p++ = ',';
p += hexnumstr (p, (ULONGEST) 0);
*p++ = ':';
*p = '\0';
putpkt_binary (rs->buf, (int) (p - rs->buf));
getpkt (&rs->buf, &rs->buf_size, 0);
if (rs->buf[0] == '\0')
{
if (remote_debug)
fprintf_unfiltered (gdb_stdlog,
"binary downloading NOT "
"supported by target\n");
remote_protocol_packets[PACKET_X].support = PACKET_DISABLE;
}
else
{
if (remote_debug)
fprintf_unfiltered (gdb_stdlog,
"binary downloading supported by target\n");
remote_protocol_packets[PACKET_X].support = PACKET_ENABLE;
}
break;
}
}
}
/* Write memory data directly to the remote machine.
This does not inform the data cache; the data cache uses this.
HEADER is the starting part of the packet.
MEMADDR is the address in the remote memory space.
MYADDR is the address of the buffer in our space.
LEN is the number of bytes.
PACKET_FORMAT should be either 'X' or 'M', and indicates if we
should send data as binary ('X'), or hex-encoded ('M').
The function creates packet of the form
<HEADER><ADDRESS>,<LENGTH>:<DATA>
where encoding of <DATA> is termined by PACKET_FORMAT.
If USE_LENGTH is 0, then the <LENGTH> field and the preceding comma
are omitted.
Returns the number of bytes transferred, or 0 (setting errno) for
error. Only transfer a single packet. */
static int
remote_write_bytes_aux (const char *header, CORE_ADDR memaddr,
const gdb_byte *myaddr, int len,
char packet_format, int use_length)
{
struct remote_state *rs = get_remote_state ();
char *p;
char *plen = NULL;
int plenlen = 0;
int todo;
int nr_bytes;
int payload_size;
int payload_length;
int header_length;
if (packet_format != 'X' && packet_format != 'M')
internal_error (__FILE__, __LINE__,
_("remote_write_bytes_aux: bad packet format"));
if (len <= 0)
return 0;
payload_size = get_memory_write_packet_size ();
/* The packet buffer will be large enough for the payload;
get_memory_packet_size ensures this. */
rs->buf[0] = '\0';
/* Compute the size of the actual payload by subtracting out the
packet header and footer overhead: "$M<memaddr>,<len>:...#nn". */
payload_size -= strlen ("$,:#NN");
if (!use_length)
/* The comma won't be used. */
payload_size += 1;
header_length = strlen (header);
payload_size -= header_length;
payload_size -= hexnumlen (memaddr);
/* Construct the packet excluding the data: "<header><memaddr>,<len>:". */
strcat (rs->buf, header);
p = rs->buf + strlen (header);
/* Compute a best guess of the number of bytes actually transfered. */
if (packet_format == 'X')
{
/* Best guess at number of bytes that will fit. */
todo = min (len, payload_size);
if (use_length)
payload_size -= hexnumlen (todo);
todo = min (todo, payload_size);
}
else
{
/* Num bytes that will fit. */
todo = min (len, payload_size / 2);
if (use_length)
payload_size -= hexnumlen (todo);
todo = min (todo, payload_size / 2);
}
if (todo <= 0)
internal_error (__FILE__, __LINE__,
_("minimum packet size too small to write data"));
/* If we already need another packet, then try to align the end
of this packet to a useful boundary. */
if (todo > 2 * REMOTE_ALIGN_WRITES && todo < len)
todo = ((memaddr + todo) & ~(REMOTE_ALIGN_WRITES - 1)) - memaddr;
/* Append "<memaddr>". */
memaddr = remote_address_masked (memaddr);
p += hexnumstr (p, (ULONGEST) memaddr);
if (use_length)
{
/* Append ",". */
*p++ = ',';
/* Append <len>. Retain the location/size of <len>. It may need to
be adjusted once the packet body has been created. */
plen = p;
plenlen = hexnumstr (p, (ULONGEST) todo);
p += plenlen;
}
/* Append ":". */
*p++ = ':';
*p = '\0';
/* Append the packet body. */
if (packet_format == 'X')
{
/* Binary mode. Send target system values byte by byte, in
increasing byte addresses. Only escape certain critical
characters. */
payload_length = remote_escape_output (myaddr, todo, p, &nr_bytes,
payload_size);
/* If not all TODO bytes fit, then we'll need another packet. Make
a second try to keep the end of the packet aligned. Don't do
this if the packet is tiny. */
if (nr_bytes < todo && nr_bytes > 2 * REMOTE_ALIGN_WRITES)
{
int new_nr_bytes;
new_nr_bytes = (((memaddr + nr_bytes) & ~(REMOTE_ALIGN_WRITES - 1))
- memaddr);
if (new_nr_bytes != nr_bytes)
payload_length = remote_escape_output (myaddr, new_nr_bytes,
p, &nr_bytes,
payload_size);
}
p += payload_length;
if (use_length && nr_bytes < todo)
{
/* Escape chars have filled up the buffer prematurely,
and we have actually sent fewer bytes than planned.
Fix-up the length field of the packet. Use the same
number of characters as before. */
plen += hexnumnstr (plen, (ULONGEST) nr_bytes, plenlen);
*plen = ':'; /* overwrite \0 from hexnumnstr() */
}
}
else
{
/* Normal mode: Send target system values byte by byte, in
increasing byte addresses. Each byte is encoded as a two hex
value. */
nr_bytes = bin2hex (myaddr, p, todo);
p += 2 * nr_bytes;
}
putpkt_binary (rs->buf, (int) (p - rs->buf));
getpkt (&rs->buf, &rs->buf_size, 0);
if (rs->buf[0] == 'E')
{
/* There is no correspondance between what the remote protocol
uses for errors and errno codes. We would like a cleaner way
of representing errors (big enough to include errno codes,
bfd_error codes, and others). But for now just return EIO. */
errno = EIO;
return 0;
}
/* Return NR_BYTES, not TODO, in case escape chars caused us to send
fewer bytes than we'd planned. */
return nr_bytes;
}
/* Write memory data directly to the remote machine.
This does not inform the data cache; the data cache uses this.
MEMADDR is the address in the remote memory space.
MYADDR is the address of the buffer in our space.
LEN is the number of bytes.
Returns number of bytes transferred, or 0 (setting errno) for
error. Only transfer a single packet. */
static int
remote_write_bytes (CORE_ADDR memaddr, const gdb_byte *myaddr, int len)
{
char *packet_format = 0;
/* Check whether the target supports binary download. */
check_binary_download (memaddr);
switch (remote_protocol_packets[PACKET_X].support)
{
case PACKET_ENABLE:
packet_format = "X";
break;
case PACKET_DISABLE:
packet_format = "M";
break;
case PACKET_SUPPORT_UNKNOWN:
internal_error (__FILE__, __LINE__,
_("remote_write_bytes: bad internal state"));
default:
internal_error (__FILE__, __LINE__, _("bad switch"));
}
return remote_write_bytes_aux (packet_format,
memaddr, myaddr, len, packet_format[0], 1);
}
/* Read memory data directly from the remote machine.
This does not use the data cache; the data cache uses this.
MEMADDR is the address in the remote memory space.
MYADDR is the address of the buffer in our space.
LEN is the number of bytes.
Returns number of bytes transferred, or 0 for error. */
static int
remote_read_bytes (CORE_ADDR memaddr, gdb_byte *myaddr, int len)
{
struct remote_state *rs = get_remote_state ();
int max_buf_size; /* Max size of packet output buffer. */
char *p;
int todo;
int i;
if (len <= 0)
return 0;
max_buf_size = get_memory_read_packet_size ();
/* The packet buffer will be large enough for the payload;
get_memory_packet_size ensures this. */
/* Number if bytes that will fit. */
todo = min (len, max_buf_size / 2);
/* Construct "m"<memaddr>","<len>". */
memaddr = remote_address_masked (memaddr);
p = rs->buf;
*p++ = 'm';
p += hexnumstr (p, (ULONGEST) memaddr);
*p++ = ',';
p += hexnumstr (p, (ULONGEST) todo);
*p = '\0';
putpkt (rs->buf);
getpkt (&rs->buf, &rs->buf_size, 0);
if (rs->buf[0] == 'E'
&& isxdigit (rs->buf[1]) && isxdigit (rs->buf[2])
&& rs->buf[3] == '\0')
{
/* There is no correspondance between what the remote protocol
uses for errors and errno codes. We would like a cleaner way
of representing errors (big enough to include errno codes,
bfd_error codes, and others). But for now just return
EIO. */
errno = EIO;
return 0;
}
/* Reply describes memory byte by byte, each byte encoded as two hex
characters. */
p = rs->buf;
i = hex2bin (p, myaddr, todo);
/* Return what we have. Let higher layers handle partial reads. */
return i;
}
/* Remote notification handler. */
static void
handle_notification (char *buf, size_t length)
{
if (strncmp (buf, "Stop:", 5) == 0)
{
if (pending_stop_reply)
{
/* We've already parsed the in-flight stop-reply, but the
stub for some reason thought we didn't, possibly due to
timeout on its side. Just ignore it. */
if (remote_debug)
fprintf_unfiltered (gdb_stdlog, "ignoring resent notification\n");
}
else
{
struct cleanup *old_chain;
struct stop_reply *reply = stop_reply_xmalloc ();
old_chain = make_cleanup (do_stop_reply_xfree, reply);
remote_parse_stop_reply (buf + 5, reply);
discard_cleanups (old_chain);
/* Be careful to only set it after parsing, since an error
may be thrown then. */
pending_stop_reply = reply;
/* Notify the event loop there's a stop reply to acknowledge
and that there may be more events to fetch. */
mark_async_event_handler (remote_async_get_pending_events_token);
if (remote_debug)
fprintf_unfiltered (gdb_stdlog, "stop notification captured\n");
}
}
else
/* We ignore notifications we don't recognize, for compatibility
with newer stubs. */
;
}
/* Read or write LEN bytes from inferior memory at MEMADDR,
transferring to or from debugger address BUFFER. Write to inferior
if SHOULD_WRITE is nonzero. Returns length of data written or
read; 0 for error. TARGET is unused. */
static int
remote_xfer_memory (CORE_ADDR mem_addr, gdb_byte *buffer, int mem_len,
int should_write, struct mem_attrib *attrib,
struct target_ops *target)
{
int res;
set_remote_traceframe ();
set_general_thread (inferior_ptid);
if (should_write)
res = remote_write_bytes (mem_addr, buffer, mem_len);
else
res = remote_read_bytes (mem_addr, buffer, mem_len);
return res;
}
/* Sends a packet with content determined by the printf format string
FORMAT and the remaining arguments, then gets the reply. Returns
whether the packet was a success, a failure, or unknown. */
static enum packet_result
remote_send_printf (const char *format, ...)
{
struct remote_state *rs = get_remote_state ();
int max_size = get_remote_packet_size ();
va_list ap;
va_start (ap, format);
rs->buf[0] = '\0';
if (vsnprintf (rs->buf, max_size, format, ap) >= max_size)
internal_error (__FILE__, __LINE__, _("Too long remote packet."));
if (putpkt (rs->buf) < 0)
error (_("Communication problem with target."));
rs->buf[0] = '\0';
getpkt (&rs->buf, &rs->buf_size, 0);
return packet_check_result (rs->buf);
}
static void
restore_remote_timeout (void *p)
{
int value = *(int *)p;
remote_timeout = value;
}
/* Flash writing can take quite some time. We'll set
effectively infinite timeout for flash operations.
In future, we'll need to decide on a better approach. */
static const int remote_flash_timeout = 1000;
static void
remote_flash_erase (struct target_ops *ops,
ULONGEST address, LONGEST length)
{
int addr_size = gdbarch_addr_bit (target_gdbarch) / 8;
int saved_remote_timeout = remote_timeout;
enum packet_result ret;
struct cleanup *back_to = make_cleanup (restore_remote_timeout,
&saved_remote_timeout);
remote_timeout = remote_flash_timeout;
ret = remote_send_printf ("vFlashErase:%s,%s",
phex (address, addr_size),
phex (length, 4));
switch (ret)
{
case PACKET_UNKNOWN:
error (_("Remote target does not support flash erase"));
case PACKET_ERROR:
error (_("Error erasing flash with vFlashErase packet"));
default:
break;
}
do_cleanups (back_to);
}
static LONGEST
remote_flash_write (struct target_ops *ops,
ULONGEST address, LONGEST length,
const gdb_byte *data)
{
int saved_remote_timeout = remote_timeout;
int ret;
struct cleanup *back_to = make_cleanup (restore_remote_timeout,
&saved_remote_timeout);
remote_timeout = remote_flash_timeout;
ret = remote_write_bytes_aux ("vFlashWrite:", address, data, length, 'X', 0);
do_cleanups (back_to);
return ret;
}
static void
remote_flash_done (struct target_ops *ops)
{
int saved_remote_timeout = remote_timeout;
int ret;
struct cleanup *back_to = make_cleanup (restore_remote_timeout,
&saved_remote_timeout);
remote_timeout = remote_flash_timeout;
ret = remote_send_printf ("vFlashDone");
do_cleanups (back_to);
switch (ret)
{
case PACKET_UNKNOWN:
error (_("Remote target does not support vFlashDone"));
case PACKET_ERROR:
error (_("Error finishing flash operation"));
default:
break;
}
}
static void
remote_files_info (struct target_ops *ignore)
{
puts_filtered ("Debugging a target over a serial line.\n");
}
/* Stuff for dealing with the packets which are part of this protocol.
See comment at top of file for details. */
/* Read a single character from the remote end. */
static int
readchar (int timeout)
{
int ch;
ch = serial_readchar (remote_desc, timeout);
if (ch >= 0)
return ch;
switch ((enum serial_rc) ch)
{
case SERIAL_EOF:
pop_target ();
error (_("Remote connection closed"));
/* no return */
case SERIAL_ERROR:
pop_target ();
perror_with_name (_("Remote communication error. "
"Target disconnected."));
/* no return */
case SERIAL_TIMEOUT:
break;
}
return ch;
}
/* Send the command in *BUF to the remote machine, and read the reply
into *BUF. Report an error if we get an error reply. Resize
*BUF using xrealloc if necessary to hold the result, and update
*SIZEOF_BUF. */
static void
remote_send (char **buf,
long *sizeof_buf)
{
putpkt (*buf);
getpkt (buf, sizeof_buf, 0);
if ((*buf)[0] == 'E')
error (_("Remote failure reply: %s"), *buf);
}
/* Return a pointer to an xmalloc'ed string representing an escaped
version of BUF, of len N. E.g. \n is converted to \\n, \t to \\t,
etc. The caller is responsible for releasing the returned
memory. */
static char *
escape_buffer (const char *buf, int n)
{
struct cleanup *old_chain;
struct ui_file *stb;
char *str;
stb = mem_fileopen ();
old_chain = make_cleanup_ui_file_delete (stb);
fputstrn_unfiltered (buf, n, 0, stb);
str = ui_file_xstrdup (stb, NULL);
do_cleanups (old_chain);
return str;
}
/* Display a null-terminated packet on stdout, for debugging, using C
string notation. */
static void
print_packet (char *buf)
{
puts_filtered ("\"");
fputstr_filtered (buf, '"', gdb_stdout);
puts_filtered ("\"");
}
int
putpkt (char *buf)
{
return putpkt_binary (buf, strlen (buf));
}
/* Send a packet to the remote machine, with error checking. The data
of the packet is in BUF. The string in BUF can be at most
get_remote_packet_size () - 5 to account for the $, # and checksum,
and for a possible /0 if we are debugging (remote_debug) and want
to print the sent packet as a string. */
static int
putpkt_binary (char *buf, int cnt)
{
struct remote_state *rs = get_remote_state ();
int i;
unsigned char csum = 0;
char *buf2 = alloca (cnt + 6);
int ch;
int tcount = 0;
char *p;
/* Catch cases like trying to read memory or listing threads while
we're waiting for a stop reply. The remote server wouldn't be
ready to handle this request, so we'd hang and timeout. We don't
have to worry about this in synchronous mode, because in that
case it's not possible to issue a command while the target is
running. This is not a problem in non-stop mode, because in that
case, the stub is always ready to process serial input. */
if (!non_stop && target_can_async_p () && rs->waiting_for_stop_reply)
error (_("Cannot execute this command while the target is running."));
/* We're sending out a new packet. Make sure we don't look at a
stale cached response. */
rs->cached_wait_status = 0;
/* Copy the packet into buffer BUF2, encapsulating it
and giving it a checksum. */
p = buf2;
*p++ = '$';
for (i = 0; i < cnt; i++)
{
csum += buf[i];
*p++ = buf[i];
}
*p++ = '#';
*p++ = tohex ((csum >> 4) & 0xf);
*p++ = tohex (csum & 0xf);
/* Send it over and over until we get a positive ack. */
while (1)
{
int started_error_output = 0;
if (remote_debug)
{
struct cleanup *old_chain;
char *str;
*p = '\0';
str = escape_buffer (buf2, p - buf2);
old_chain = make_cleanup (xfree, str);
fprintf_unfiltered (gdb_stdlog, "Sending packet: %s...", str);
gdb_flush (gdb_stdlog);
do_cleanups (old_chain);
}
if (serial_write (remote_desc, buf2, p - buf2))
perror_with_name (_("putpkt: write failed"));
/* If this is a no acks version of the remote protocol, send the
packet and move on. */
if (rs->noack_mode)
break;
/* Read until either a timeout occurs (-2) or '+' is read.
Handle any notification that arrives in the mean time. */
while (1)
{
ch = readchar (remote_timeout);
if (remote_debug)
{
switch (ch)
{
case '+':
case '-':
case SERIAL_TIMEOUT:
case '$':
case '%':
if (started_error_output)
{
putchar_unfiltered ('\n');
started_error_output = 0;
}
}
}
switch (ch)
{
case '+':
if (remote_debug)
fprintf_unfiltered (gdb_stdlog, "Ack\n");
return 1;
case '-':
if (remote_debug)
fprintf_unfiltered (gdb_stdlog, "Nak\n");
/* FALLTHROUGH */
case SERIAL_TIMEOUT:
tcount++;
if (tcount > 3)
return 0;
break; /* Retransmit buffer. */
case '$':
{
if (remote_debug)
fprintf_unfiltered (gdb_stdlog,
"Packet instead of Ack, ignoring it\n");
/* It's probably an old response sent because an ACK
was lost. Gobble up the packet and ack it so it
doesn't get retransmitted when we resend this
packet. */
skip_frame ();
serial_write (remote_desc, "+", 1);
continue; /* Now, go look for +. */
}
case '%':
{
int val;
/* If we got a notification, handle it, and go back to looking
for an ack. */
/* We've found the start of a notification. Now
collect the data. */
val = read_frame (&rs->buf, &rs->buf_size);
if (val >= 0)
{
if (remote_debug)
{
struct cleanup *old_chain;
char *str;
str = escape_buffer (rs->buf, val);
old_chain = make_cleanup (xfree, str);
fprintf_unfiltered (gdb_stdlog,
" Notification received: %s\n",
str);
do_cleanups (old_chain);
}
handle_notification (rs->buf, val);
/* We're in sync now, rewait for the ack. */
tcount = 0;
}
else
{
if (remote_debug)
{
if (!started_error_output)
{
started_error_output = 1;
fprintf_unfiltered (gdb_stdlog, "putpkt: Junk: ");
}
fputc_unfiltered (ch & 0177, gdb_stdlog);
fprintf_unfiltered (gdb_stdlog, "%s", rs->buf);
}
}
continue;
}
/* fall-through */
default:
if (remote_debug)
{
if (!started_error_output)
{
started_error_output = 1;
fprintf_unfiltered (gdb_stdlog, "putpkt: Junk: ");
}
fputc_unfiltered (ch & 0177, gdb_stdlog);
}
continue;
}
break; /* Here to retransmit. */
}
#if 0
/* This is wrong. If doing a long backtrace, the user should be
able to get out next time we call QUIT, without anything as
violent as interrupt_query. If we want to provide a way out of
here without getting to the next QUIT, it should be based on
hitting ^C twice as in remote_wait. */
if (quit_flag)
{
quit_flag = 0;
interrupt_query ();
}
#endif
}
return 0;
}
/* Come here after finding the start of a frame when we expected an
ack. Do our best to discard the rest of this packet. */
static void
skip_frame (void)
{
int c;
while (1)
{
c = readchar (remote_timeout);
switch (c)
{
case SERIAL_TIMEOUT:
/* Nothing we can do. */
return;
case '#':
/* Discard the two bytes of checksum and stop. */
c = readchar (remote_timeout);
if (c >= 0)
c = readchar (remote_timeout);
return;
case '*': /* Run length encoding. */
/* Discard the repeat count. */
c = readchar (remote_timeout);
if (c < 0)
return;
break;
default:
/* A regular character. */
break;
}
}
}
/* Come here after finding the start of the frame. Collect the rest
into *BUF, verifying the checksum, length, and handling run-length
compression. NUL terminate the buffer. If there is not enough room,
expand *BUF using xrealloc.
Returns -1 on error, number of characters in buffer (ignoring the
trailing NULL) on success. (could be extended to return one of the
SERIAL status indications). */
static long
read_frame (char **buf_p,
long *sizeof_buf)
{
unsigned char csum;
long bc;
int c;
char *buf = *buf_p;
struct remote_state *rs = get_remote_state ();
csum = 0;
bc = 0;
while (1)
{
c = readchar (remote_timeout);
switch (c)
{
case SERIAL_TIMEOUT:
if (remote_debug)
fputs_filtered ("Timeout in mid-packet, retrying\n", gdb_stdlog);
return -1;
case '$':
if (remote_debug)
fputs_filtered ("Saw new packet start in middle of old one\n",
gdb_stdlog);
return -1; /* Start a new packet, count retries. */
case '#':
{
unsigned char pktcsum;
int check_0 = 0;
int check_1 = 0;
buf[bc] = '\0';
check_0 = readchar (remote_timeout);
if (check_0 >= 0)
check_1 = readchar (remote_timeout);
if (check_0 == SERIAL_TIMEOUT || check_1 == SERIAL_TIMEOUT)
{
if (remote_debug)
fputs_filtered ("Timeout in checksum, retrying\n",
gdb_stdlog);
return -1;
}
else if (check_0 < 0 || check_1 < 0)
{
if (remote_debug)
fputs_filtered ("Communication error in checksum\n",
gdb_stdlog);
return -1;
}
/* Don't recompute the checksum; with no ack packets we
don't have any way to indicate a packet retransmission
is necessary. */
if (rs->noack_mode)
return bc;
pktcsum = (fromhex (check_0) << 4) | fromhex (check_1);
if (csum == pktcsum)
return bc;
if (remote_debug)
{
struct cleanup *old_chain;
char *str;
str = escape_buffer (buf, bc);
old_chain = make_cleanup (xfree, str);
fprintf_unfiltered (gdb_stdlog,
"Bad checksum, sentsum=0x%x, "
"csum=0x%x, buf=%s\n",
pktcsum, csum, str);
do_cleanups (old_chain);
}
/* Number of characters in buffer ignoring trailing
NULL. */
return -1;
}
case '*': /* Run length encoding. */
{
int repeat;
csum += c;
c = readchar (remote_timeout);
csum += c;
repeat = c - ' ' + 3; /* Compute repeat count. */
/* The character before ``*'' is repeated. */
if (repeat > 0 && repeat <= 255 && bc > 0)
{
if (bc + repeat - 1 >= *sizeof_buf - 1)
{
/* Make some more room in the buffer. */
*sizeof_buf += repeat;
*buf_p = xrealloc (*buf_p, *sizeof_buf);
buf = *buf_p;
}
memset (&buf[bc], buf[bc - 1], repeat);
bc += repeat;
continue;
}
buf[bc] = '\0';
printf_filtered (_("Invalid run length encoding: %s\n"), buf);
return -1;
}
default:
if (bc >= *sizeof_buf - 1)
{
/* Make some more room in the buffer. */
*sizeof_buf *= 2;
*buf_p = xrealloc (*buf_p, *sizeof_buf);
buf = *buf_p;
}
buf[bc++] = c;
csum += c;
continue;
}
}
}
/* Read a packet from the remote machine, with error checking, and
store it in *BUF. Resize *BUF using xrealloc if necessary to hold
the result, and update *SIZEOF_BUF. If FOREVER, wait forever
rather than timing out; this is used (in synchronous mode) to wait
for a target that is is executing user code to stop. */
/* FIXME: ezannoni 2000-02-01 this wrapper is necessary so that we
don't have to change all the calls to getpkt to deal with the
return value, because at the moment I don't know what the right
thing to do it for those. */
void
getpkt (char **buf,
long *sizeof_buf,
int forever)
{
int timed_out;
timed_out = getpkt_sane (buf, sizeof_buf, forever);
}
/* Read a packet from the remote machine, with error checking, and
store it in *BUF. Resize *BUF using xrealloc if necessary to hold
the result, and update *SIZEOF_BUF. If FOREVER, wait forever
rather than timing out; this is used (in synchronous mode) to wait
for a target that is is executing user code to stop. If FOREVER ==
0, this function is allowed to time out gracefully and return an
indication of this to the caller. Otherwise return the number of
bytes read. If EXPECTING_NOTIF, consider receiving a notification
enough reason to return to the caller. */
static int
getpkt_or_notif_sane_1 (char **buf, long *sizeof_buf, int forever,
int expecting_notif)
{
struct remote_state *rs = get_remote_state ();
int c;
int tries;
int timeout;
int val = -1;
/* We're reading a new response. Make sure we don't look at a
previously cached response. */
rs->cached_wait_status = 0;
strcpy (*buf, "timeout");
if (forever)
timeout = watchdog > 0 ? watchdog : -1;
else if (expecting_notif)
timeout = 0; /* There should already be a char in the buffer. If
not, bail out. */
else
timeout = remote_timeout;
#define MAX_TRIES 3
/* Process any number of notifications, and then return when
we get a packet. */
for (;;)
{
/* If we get a timeout or bad checksm, retry up to MAX_TRIES
times. */
for (tries = 1; tries <= MAX_TRIES; tries++)
{
/* This can loop forever if the remote side sends us
characters continuously, but if it pauses, we'll get
SERIAL_TIMEOUT from readchar because of timeout. Then
we'll count that as a retry.
Note that even when forever is set, we will only wait
forever prior to the start of a packet. After that, we
expect characters to arrive at a brisk pace. They should
show up within remote_timeout intervals. */
do
c = readchar (timeout);
while (c != SERIAL_TIMEOUT && c != '$' && c != '%');
if (c == SERIAL_TIMEOUT)
{
if (expecting_notif)
return -1; /* Don't complain, it's normal to not get
anything in this case. */
if (forever) /* Watchdog went off? Kill the target. */
{
QUIT;
pop_target ();
error (_("Watchdog timeout has expired. Target detached."));
}
if (remote_debug)
fputs_filtered ("Timed out.\n", gdb_stdlog);
}
else
{
/* We've found the start of a packet or notification.
Now collect the data. */
val = read_frame (buf, sizeof_buf);
if (val >= 0)
break;
}
serial_write (remote_desc, "-", 1);
}
if (tries > MAX_TRIES)
{
/* We have tried hard enough, and just can't receive the
packet/notification. Give up. */
printf_unfiltered (_("Ignoring packet error, continuing...\n"));
/* Skip the ack char if we're in no-ack mode. */
if (!rs->noack_mode)
serial_write (remote_desc, "+", 1);
return -1;
}
/* If we got an ordinary packet, return that to our caller. */
if (c == '$')
{
if (remote_debug)
{
struct cleanup *old_chain;
char *str;
str = escape_buffer (*buf, val);
old_chain = make_cleanup (xfree, str);
fprintf_unfiltered (gdb_stdlog, "Packet received: %s\n", str);
do_cleanups (old_chain);
}
/* Skip the ack char if we're in no-ack mode. */
if (!rs->noack_mode)
serial_write (remote_desc, "+", 1);
return val;
}
/* If we got a notification, handle it, and go back to looking
for a packet. */
else
{
gdb_assert (c == '%');
if (remote_debug)
{
struct cleanup *old_chain;
char *str;
str = escape_buffer (*buf, val);
old_chain = make_cleanup (xfree, str);
fprintf_unfiltered (gdb_stdlog,
" Notification received: %s\n",
str);
do_cleanups (old_chain);
}
handle_notification (*buf, val);
/* Notifications require no acknowledgement. */
if (expecting_notif)
return -1;
}
}
}
static int
getpkt_sane (char **buf, long *sizeof_buf, int forever)
{
return getpkt_or_notif_sane_1 (buf, sizeof_buf, forever, 0);
}
static int
getpkt_or_notif_sane (char **buf, long *sizeof_buf, int forever)
{
return getpkt_or_notif_sane_1 (buf, sizeof_buf, forever, 1);
}
/* A helper function that just calls putpkt; for type correctness. */
static int
putpkt_for_catch_errors (void *arg)
{
return putpkt (arg);
}
static void
remote_kill (struct target_ops *ops)
{
/* Use catch_errors so the user can quit from gdb even when we
aren't on speaking terms with the remote system. */
catch_errors (putpkt_for_catch_errors, "k", "", RETURN_MASK_ERROR);
/* Don't wait for it to die. I'm not really sure it matters whether
we do or not. For the existing stubs, kill is a noop. */
target_mourn_inferior ();
}
static int
remote_vkill (int pid, struct remote_state *rs)
{
if (remote_protocol_packets[PACKET_vKill].support == PACKET_DISABLE)
return -1;
/* Tell the remote target to detach. */
sprintf (rs->buf, "vKill;%x", pid);
putpkt (rs->buf);
getpkt (&rs->buf, &rs->buf_size, 0);
if (packet_ok (rs->buf,
&remote_protocol_packets[PACKET_vKill]) == PACKET_OK)
return 0;
else if (remote_protocol_packets[PACKET_vKill].support == PACKET_DISABLE)
return -1;
else
return 1;
}
static void
extended_remote_kill (struct target_ops *ops)
{
int res;
int pid = ptid_get_pid (inferior_ptid);
struct remote_state *rs = get_remote_state ();
res = remote_vkill (pid, rs);
if (res == -1 && !remote_multi_process_p (rs))
{
/* Don't try 'k' on a multi-process aware stub -- it has no way
to specify the pid. */
putpkt ("k");
#if 0
getpkt (&rs->buf, &rs->buf_size, 0);
if (rs->buf[0] != 'O' || rs->buf[0] != 'K')
res = 1;
#else
/* Don't wait for it to die. I'm not really sure it matters whether
we do or not. For the existing stubs, kill is a noop. */
res = 0;
#endif
}
if (res != 0)
error (_("Can't kill process"));
target_mourn_inferior ();
}
static void
remote_mourn (struct target_ops *ops)
{
remote_mourn_1 (ops);
}
/* Worker function for remote_mourn. */
static void
remote_mourn_1 (struct target_ops *target)
{
unpush_target (target);
/* remote_close takes care of doing most of the clean up. */
generic_mourn_inferior ();
}
static void
extended_remote_mourn_1 (struct target_ops *target)
{
struct remote_state *rs = get_remote_state ();
/* In case we got here due to an error, but we're going to stay
connected. */
rs->waiting_for_stop_reply = 0;
/* We're no longer interested in these events. */
discard_pending_stop_replies (ptid_get_pid (inferior_ptid));
/* If the current general thread belonged to the process we just
detached from or has exited, the remote side current general
thread becomes undefined. Considering a case like this:
- We just got here due to a detach.
- The process that we're detaching from happens to immediately
report a global breakpoint being hit in non-stop mode, in the
same thread we had selected before.
- GDB attaches to this process again.
- This event happens to be the next event we handle.
GDB would consider that the current general thread didn't need to
be set on the stub side (with Hg), since for all it knew,
GENERAL_THREAD hadn't changed.
Notice that although in all-stop mode, the remote server always
sets the current thread to the thread reporting the stop event,
that doesn't happen in non-stop mode; in non-stop, the stub *must
not* change the current thread when reporting a breakpoint hit,
due to the decoupling of event reporting and event handling.
To keep things simple, we always invalidate our notion of the
current thread. */
record_currthread (minus_one_ptid);
/* Unlike "target remote", we do not want to unpush the target; then
the next time the user says "run", we won't be connected. */
/* Call common code to mark the inferior as not running. */
generic_mourn_inferior ();
if (!have_inferiors ())
{
if (!remote_multi_process_p (rs))
{
/* Check whether the target is running now - some remote stubs
automatically restart after kill. */
putpkt ("?");
getpkt (&rs->buf, &rs->buf_size, 0);
if (rs->buf[0] == 'S' || rs->buf[0] == 'T')
{
/* Assume that the target has been restarted. Set
inferior_ptid so that bits of core GDB realizes
there's something here, e.g., so that the user can
say "kill" again. */
inferior_ptid = magic_null_ptid;
}
}
}
}
static void
extended_remote_mourn (struct target_ops *ops)
{
extended_remote_mourn_1 (ops);
}
static int
extended_remote_supports_disable_randomization (void)
{
return (remote_protocol_packets[PACKET_QDisableRandomization].support
== PACKET_ENABLE);
}
static void
extended_remote_disable_randomization (int val)
{
struct remote_state *rs = get_remote_state ();
char *reply;
sprintf (rs->buf, "QDisableRandomization:%x", val);
putpkt (rs->buf);
reply = remote_get_noisy_reply (&target_buf, &target_buf_size);
if (*reply == '\0')
error (_("Target does not support QDisableRandomization."));
if (strcmp (reply, "OK") != 0)
error (_("Bogus QDisableRandomization reply from target: %s"), reply);
}
static int
extended_remote_run (char *args)
{
struct remote_state *rs = get_remote_state ();
int len;
/* If the user has disabled vRun support, or we have detected that
support is not available, do not try it. */
if (remote_protocol_packets[PACKET_vRun].support == PACKET_DISABLE)
return -1;
strcpy (rs->buf, "vRun;");
len = strlen (rs->buf);
if (strlen (remote_exec_file) * 2 + len >= get_remote_packet_size ())
error (_("Remote file name too long for run packet"));
len += 2 * bin2hex ((gdb_byte *) remote_exec_file, rs->buf + len, 0);
gdb_assert (args != NULL);
if (*args)
{
struct cleanup *back_to;
int i;
char **argv;
argv = gdb_buildargv (args);
back_to = make_cleanup ((void (*) (void *)) freeargv, argv);
for (i = 0; argv[i] != NULL; i++)
{
if (strlen (argv[i]) * 2 + 1 + len >= get_remote_packet_size ())
error (_("Argument list too long for run packet"));
rs->buf[len++] = ';';
len += 2 * bin2hex ((gdb_byte *) argv[i], rs->buf + len, 0);
}
do_cleanups (back_to);
}
rs->buf[len++] = '\0';
putpkt (rs->buf);
getpkt (&rs->buf, &rs->buf_size, 0);
if (packet_ok (rs->buf, &remote_protocol_packets[PACKET_vRun]) == PACKET_OK)
{
/* We have a wait response; we don't need it, though. All is well. */
return 0;
}
else if (remote_protocol_packets[PACKET_vRun].support == PACKET_DISABLE)
/* It wasn't disabled before, but it is now. */
return -1;
else
{
if (remote_exec_file[0] == '\0')
error (_("Running the default executable on the remote target failed; "
"try \"set remote exec-file\"?"));
else
error (_("Running \"%s\" on the remote target failed"),
remote_exec_file);
}
}
/* In the extended protocol we want to be able to do things like
"run" and have them basically work as expected. So we need
a special create_inferior function. We support changing the
executable file and the command line arguments, but not the
environment. */
static void
extended_remote_create_inferior_1 (char *exec_file, char *args,
char **env, int from_tty)
{
/* If running asynchronously, register the target file descriptor
with the event loop. */
if (target_can_async_p ())
target_async (inferior_event_handler, 0);
/* Disable address space randomization if requested (and supported). */
if (extended_remote_supports_disable_randomization ())
extended_remote_disable_randomization (disable_randomization);
/* Now restart the remote server. */
if (extended_remote_run (args) == -1)
{
/* vRun was not supported. Fail if we need it to do what the
user requested. */
if (remote_exec_file[0])
error (_("Remote target does not support \"set remote exec-file\""));
if (args[0])
error (_("Remote target does not support \"set args\" or run <ARGS>"));
/* Fall back to "R". */
extended_remote_restart ();
}
if (!have_inferiors ())
{
/* Clean up from the last time we ran, before we mark the target
running again. This will mark breakpoints uninserted, and
get_offsets may insert breakpoints. */
init_thread_list ();
init_wait_for_inferior ();
}
/* Now mark the inferior as running before we do anything else. */
inferior_ptid = magic_null_ptid;
/* Now, if we have thread information, update inferior_ptid. */
inferior_ptid = remote_current_thread (inferior_ptid);
remote_add_inferior (ptid_get_pid (inferior_ptid), 0);
add_thread_silent (inferior_ptid);
/* Get updated offsets, if the stub uses qOffsets. */
get_offsets ();
}
static void
extended_remote_create_inferior (struct target_ops *ops,
char *exec_file, char *args,
char **env, int from_tty)
{
extended_remote_create_inferior_1 (exec_file, args, env, from_tty);
}
/* Insert a breakpoint. On targets that have software breakpoint
support, we ask the remote target to do the work; on targets
which don't, we insert a traditional memory breakpoint. */
static int
remote_insert_breakpoint (struct gdbarch *gdbarch,
struct bp_target_info *bp_tgt)
{
/* Try the "Z" s/w breakpoint packet if it is not already disabled.
If it succeeds, then set the support to PACKET_ENABLE. If it
fails, and the user has explicitly requested the Z support then
report an error, otherwise, mark it disabled and go on. */
if (remote_protocol_packets[PACKET_Z0].support != PACKET_DISABLE)
{
CORE_ADDR addr = bp_tgt->placed_address;
struct remote_state *rs;
char *p;
int bpsize;
gdbarch_remote_breakpoint_from_pc (gdbarch, &addr, &bpsize);
rs = get_remote_state ();
p = rs->buf;
*(p++) = 'Z';
*(p++) = '0';
*(p++) = ',';
addr = (ULONGEST) remote_address_masked (addr);
p += hexnumstr (p, addr);
sprintf (p, ",%d", bpsize);
putpkt (rs->buf);
getpkt (&rs->buf, &rs->buf_size, 0);
switch (packet_ok (rs->buf, &remote_protocol_packets[PACKET_Z0]))
{
case PACKET_ERROR:
return -1;
case PACKET_OK:
bp_tgt->placed_address = addr;
bp_tgt->placed_size = bpsize;
return 0;
case PACKET_UNKNOWN:
break;
}
}
return memory_insert_breakpoint (gdbarch, bp_tgt);
}
static int
remote_remove_breakpoint (struct gdbarch *gdbarch,
struct bp_target_info *bp_tgt)
{
CORE_ADDR addr = bp_tgt->placed_address;
struct remote_state *rs = get_remote_state ();
if (remote_protocol_packets[PACKET_Z0].support != PACKET_DISABLE)
{
char *p = rs->buf;
*(p++) = 'z';
*(p++) = '0';
*(p++) = ',';
addr = (ULONGEST) remote_address_masked (bp_tgt->placed_address);
p += hexnumstr (p, addr);
sprintf (p, ",%d", bp_tgt->placed_size);
putpkt (rs->buf);
getpkt (&rs->buf, &rs->buf_size, 0);
return (rs->buf[0] == 'E');
}
return memory_remove_breakpoint (gdbarch, bp_tgt);
}
static int
watchpoint_to_Z_packet (int type)
{
switch (type)
{
case hw_write:
return Z_PACKET_WRITE_WP;
break;
case hw_read:
return Z_PACKET_READ_WP;
break;
case hw_access:
return Z_PACKET_ACCESS_WP;
break;
default:
internal_error (__FILE__, __LINE__,
_("hw_bp_to_z: bad watchpoint type %d"), type);
}
}
static int
remote_insert_watchpoint (CORE_ADDR addr, int len, int type,
struct expression *cond)
{
struct remote_state *rs = get_remote_state ();
char *p;
enum Z_packet_type packet = watchpoint_to_Z_packet (type);
if (remote_protocol_packets[PACKET_Z0 + packet].support == PACKET_DISABLE)
return 1;
sprintf (rs->buf, "Z%x,", packet);
p = strchr (rs->buf, '\0');
addr = remote_address_masked (addr);
p += hexnumstr (p, (ULONGEST) addr);
sprintf (p, ",%x", len);
putpkt (rs->buf);
getpkt (&rs->buf, &rs->buf_size, 0);
switch (packet_ok (rs->buf, &remote_protocol_packets[PACKET_Z0 + packet]))
{
case PACKET_ERROR:
return -1;
case PACKET_UNKNOWN:
return 1;
case PACKET_OK:
return 0;
}
internal_error (__FILE__, __LINE__,
_("remote_insert_watchpoint: reached end of function"));
}
static int
remote_remove_watchpoint (CORE_ADDR addr, int len, int type,
struct expression *cond)
{
struct remote_state *rs = get_remote_state ();
char *p;
enum Z_packet_type packet = watchpoint_to_Z_packet (type);
if (remote_protocol_packets[PACKET_Z0 + packet].support == PACKET_DISABLE)
return -1;
sprintf (rs->buf, "z%x,", packet);
p = strchr (rs->buf, '\0');
addr = remote_address_masked (addr);
p += hexnumstr (p, (ULONGEST) addr);
sprintf (p, ",%x", len);
putpkt (rs->buf);
getpkt (&rs->buf, &rs->buf_size, 0);
switch (packet_ok (rs->buf, &remote_protocol_packets[PACKET_Z0 + packet]))
{
case PACKET_ERROR:
case PACKET_UNKNOWN:
return -1;
case PACKET_OK:
return 0;
}
internal_error (__FILE__, __LINE__,
_("remote_remove_watchpoint: reached end of function"));
}
int remote_hw_watchpoint_limit = -1;
int remote_hw_watchpoint_length_limit = -1;
int remote_hw_breakpoint_limit = -1;
static int
remote_region_ok_for_hw_watchpoint (CORE_ADDR addr, int len)
{
if (remote_hw_watchpoint_length_limit == 0)
return 0;
else if (remote_hw_watchpoint_length_limit < 0)
return 1;
else if (len <= remote_hw_watchpoint_length_limit)
return 1;
else
return 0;
}
static int
remote_check_watch_resources (int type, int cnt, int ot)
{
if (type == bp_hardware_breakpoint)
{
if (remote_hw_breakpoint_limit == 0)
return 0;
else if (remote_hw_breakpoint_limit < 0)
return 1;
else if (cnt <= remote_hw_breakpoint_limit)
return 1;
}
else
{
if (remote_hw_watchpoint_limit == 0)
return 0;
else if (remote_hw_watchpoint_limit < 0)
return 1;
else if (ot)
return -1;
else if (cnt <= remote_hw_watchpoint_limit)
return 1;
}
return -1;
}
static int
remote_stopped_by_watchpoint (void)
{
return remote_stopped_by_watchpoint_p;
}
static int
remote_stopped_data_address (struct target_ops *target, CORE_ADDR *addr_p)
{
int rc = 0;
if (remote_stopped_by_watchpoint ())
{
*addr_p = remote_watch_data_address;
rc = 1;
}
return rc;
}
static int
remote_insert_hw_breakpoint (struct gdbarch *gdbarch,
struct bp_target_info *bp_tgt)
{
CORE_ADDR addr;
struct remote_state *rs;
char *p;
/* The length field should be set to the size of a breakpoint
instruction, even though we aren't inserting one ourselves. */
gdbarch_remote_breakpoint_from_pc
(gdbarch, &bp_tgt->placed_address, &bp_tgt->placed_size);
if (remote_protocol_packets[PACKET_Z1].support == PACKET_DISABLE)
return -1;
rs = get_remote_state ();
p = rs->buf;
*(p++) = 'Z';
*(p++) = '1';
*(p++) = ',';
addr = remote_address_masked (bp_tgt->placed_address);
p += hexnumstr (p, (ULONGEST) addr);
sprintf (p, ",%x", bp_tgt->placed_size);
putpkt (rs->buf);
getpkt (&rs->buf, &rs->buf_size, 0);
switch (packet_ok (rs->buf, &remote_protocol_packets[PACKET_Z1]))
{
case PACKET_ERROR:
case PACKET_UNKNOWN:
return -1;
case PACKET_OK:
return 0;
}
internal_error (__FILE__, __LINE__,
_("remote_insert_hw_breakpoint: reached end of function"));
}
static int
remote_remove_hw_breakpoint (struct gdbarch *gdbarch,
struct bp_target_info *bp_tgt)
{
CORE_ADDR addr;
struct remote_state *rs = get_remote_state ();
char *p = rs->buf;
if (remote_protocol_packets[PACKET_Z1].support == PACKET_DISABLE)
return -1;
*(p++) = 'z';
*(p++) = '1';
*(p++) = ',';
addr = remote_address_masked (bp_tgt->placed_address);
p += hexnumstr (p, (ULONGEST) addr);
sprintf (p, ",%x", bp_tgt->placed_size);
putpkt (rs->buf);
getpkt (&rs->buf, &rs->buf_size, 0);
switch (packet_ok (rs->buf, &remote_protocol_packets[PACKET_Z1]))
{
case PACKET_ERROR:
case PACKET_UNKNOWN:
return -1;
case PACKET_OK:
return 0;
}
internal_error (__FILE__, __LINE__,
_("remote_remove_hw_breakpoint: reached end of function"));
}
/* Table used by the crc32 function to calcuate the checksum. */
static unsigned long crc32_table[256] =
{0, 0};
static unsigned long
crc32 (const unsigned char *buf, int len, unsigned int crc)
{
if (!crc32_table[1])
{
/* Initialize the CRC table and the decoding table. */
int i, j;
unsigned int c;
for (i = 0; i < 256; i++)
{
for (c = i << 24, j = 8; j > 0; --j)
c = c & 0x80000000 ? (c << 1) ^ 0x04c11db7 : (c << 1);
crc32_table[i] = c;
}
}
while (len--)
{
crc = (crc << 8) ^ crc32_table[((crc >> 24) ^ *buf) & 255];
buf++;
}
return crc;
}
/* Verify memory using the "qCRC:" request. */
static int
remote_verify_memory (struct target_ops *ops,
const gdb_byte *data, CORE_ADDR lma, ULONGEST size)
{
struct remote_state *rs = get_remote_state ();
unsigned long host_crc, target_crc;
char *tmp;
/* FIXME: assumes lma can fit into long. */
xsnprintf (rs->buf, get_remote_packet_size (), "qCRC:%lx,%lx",
(long) lma, (long) size);
putpkt (rs->buf);
/* Be clever; compute the host_crc before waiting for target
reply. */
host_crc = crc32 (data, size, 0xffffffff);
getpkt (&rs->buf, &rs->buf_size, 0);
if (rs->buf[0] == 'E')
return -1;
if (rs->buf[0] != 'C')
error (_("remote target does not support this operation"));
for (target_crc = 0, tmp = &rs->buf[1]; *tmp; tmp++)
target_crc = target_crc * 16 + fromhex (*tmp);
return (host_crc == target_crc);
}
/* compare-sections command
With no arguments, compares each loadable section in the exec bfd
with the same memory range on the target, and reports mismatches.
Useful for verifying the image on the target against the exec file. */
static void
compare_sections_command (char *args, int from_tty)
{
asection *s;
struct cleanup *old_chain;
char *sectdata;
const char *sectname;
bfd_size_type size;
bfd_vma lma;
int matched = 0;
int mismatched = 0;
int res;
if (!exec_bfd)
error (_("command cannot be used without an exec file"));
for (s = exec_bfd->sections; s; s = s->next)
{
if (!(s->flags & SEC_LOAD))
continue; /* Skip non-loadable section. */
size = bfd_get_section_size (s);
if (size == 0)
continue; /* Skip zero-length section. */
sectname = bfd_get_section_name (exec_bfd, s);
if (args && strcmp (args, sectname) != 0)
continue; /* Not the section selected by user. */
matched = 1; /* Do this section. */
lma = s->lma;
sectdata = xmalloc (size);
old_chain = make_cleanup (xfree, sectdata);
bfd_get_section_contents (exec_bfd, s, sectdata, 0, size);
res = target_verify_memory (sectdata, lma, size);
if (res == -1)
error (_("target memory fault, section %s, range %s -- %s"), sectname,
paddress (target_gdbarch, lma),
paddress (target_gdbarch, lma + size));
printf_filtered ("Section %s, range %s -- %s: ", sectname,
paddress (target_gdbarch, lma),
paddress (target_gdbarch, lma + size));
if (res)
printf_filtered ("matched.\n");
else
{
printf_filtered ("MIS-MATCHED!\n");
mismatched++;
}
do_cleanups (old_chain);
}
if (mismatched > 0)
warning (_("One or more sections of the remote executable does not match\n\
the loaded file\n"));
if (args && !matched)
printf_filtered (_("No loaded section named '%s'.\n"), args);
}
/* Write LEN bytes from WRITEBUF into OBJECT_NAME/ANNEX at OFFSET
into remote target. The number of bytes written to the remote
target is returned, or -1 for error. */
static LONGEST
remote_write_qxfer (struct target_ops *ops, const char *object_name,
const char *annex, const gdb_byte *writebuf,
ULONGEST offset, LONGEST len,
struct packet_config *packet)
{
int i, buf_len;
ULONGEST n;
struct remote_state *rs = get_remote_state ();
int max_size = get_memory_write_packet_size ();
if (packet->support == PACKET_DISABLE)
return -1;
/* Insert header. */
i = snprintf (rs->buf, max_size,
"qXfer:%s:write:%s:%s:",
object_name, annex ? annex : "",
phex_nz (offset, sizeof offset));
max_size -= (i + 1);
/* Escape as much data as fits into rs->buf. */
buf_len = remote_escape_output
(writebuf, len, (rs->buf + i), &max_size, max_size);
if (putpkt_binary (rs->buf, i + buf_len) < 0
|| getpkt_sane (&rs->buf, &rs->buf_size, 0) < 0
|| packet_ok (rs->buf, packet) != PACKET_OK)
return -1;
unpack_varlen_hex (rs->buf, &n);
return n;
}
/* Read OBJECT_NAME/ANNEX from the remote target using a qXfer packet.
Data at OFFSET, of up to LEN bytes, is read into READBUF; the
number of bytes read is returned, or 0 for EOF, or -1 for error.
The number of bytes read may be less than LEN without indicating an
EOF. PACKET is checked and updated to indicate whether the remote
target supports this object. */
static LONGEST
remote_read_qxfer (struct target_ops *ops, const char *object_name,
const char *annex,
gdb_byte *readbuf, ULONGEST offset, LONGEST len,
struct packet_config *packet)
{
static char *finished_object;
static char *finished_annex;
static ULONGEST finished_offset;
struct remote_state *rs = get_remote_state ();
LONGEST i, n, packet_len;
if (packet->support == PACKET_DISABLE)
return -1;
/* Check whether we've cached an end-of-object packet that matches
this request. */
if (finished_object)
{
if (strcmp (object_name, finished_object) == 0
&& strcmp (annex ? annex : "", finished_annex) == 0
&& offset == finished_offset)
return 0;
/* Otherwise, we're now reading something different. Discard
the cache. */
xfree (finished_object);
xfree (finished_annex);
finished_object = NULL;
finished_annex = NULL;
}
/* Request only enough to fit in a single packet. The actual data
may not, since we don't know how much of it will need to be escaped;
the target is free to respond with slightly less data. We subtract
five to account for the response type and the protocol frame. */
n = min (get_remote_packet_size () - 5, len);
snprintf (rs->buf, get_remote_packet_size () - 4, "qXfer:%s:read:%s:%s,%s",
object_name, annex ? annex : "",
phex_nz (offset, sizeof offset),
phex_nz (n, sizeof n));
i = putpkt (rs->buf);
if (i < 0)
return -1;
rs->buf[0] = '\0';
packet_len = getpkt_sane (&rs->buf, &rs->buf_size, 0);
if (packet_len < 0 || packet_ok (rs->buf, packet) != PACKET_OK)
return -1;
if (rs->buf[0] != 'l' && rs->buf[0] != 'm')
error (_("Unknown remote qXfer reply: %s"), rs->buf);
/* 'm' means there is (or at least might be) more data after this
batch. That does not make sense unless there's at least one byte
of data in this reply. */
if (rs->buf[0] == 'm' && packet_len == 1)
error (_("Remote qXfer reply contained no data."));
/* Got some data. */
i = remote_unescape_input (rs->buf + 1, packet_len - 1, readbuf, n);
/* 'l' is an EOF marker, possibly including a final block of data,
or possibly empty. If we have the final block of a non-empty
object, record this fact to bypass a subsequent partial read. */
if (rs->buf[0] == 'l' && offset + i > 0)
{
finished_object = xstrdup (object_name);
finished_annex = xstrdup (annex ? annex : "");
finished_offset = offset + i;
}
return i;
}
static LONGEST
remote_xfer_partial (struct target_ops *ops, enum target_object object,
const char *annex, gdb_byte *readbuf,
const gdb_byte *writebuf, ULONGEST offset, LONGEST len)
{
struct remote_state *rs;
int i;
char *p2;
char query_type;
set_remote_traceframe ();
set_general_thread (inferior_ptid);
rs = get_remote_state ();
/* Handle memory using the standard memory routines. */
if (object == TARGET_OBJECT_MEMORY)
{
int xfered;
errno = 0;
/* If the remote target is connected but not running, we should
pass this request down to a lower stratum (e.g. the executable
file). */
if (!target_has_execution)
return 0;
if (writebuf != NULL)
xfered = remote_write_bytes (offset, writebuf, len);
else
xfered = remote_read_bytes (offset, readbuf, len);
if (xfered > 0)
return xfered;
else if (xfered == 0 && errno == 0)
return 0;
else
return -1;
}
/* Handle SPU memory using qxfer packets. */
if (object == TARGET_OBJECT_SPU)
{
if (readbuf)
return remote_read_qxfer (ops, "spu", annex, readbuf, offset, len,
&remote_protocol_packets
[PACKET_qXfer_spu_read]);
else
return remote_write_qxfer (ops, "spu", annex, writebuf, offset, len,
&remote_protocol_packets
[PACKET_qXfer_spu_write]);
}
/* Handle extra signal info using qxfer packets. */
if (object == TARGET_OBJECT_SIGNAL_INFO)
{
if (readbuf)
return remote_read_qxfer (ops, "siginfo", annex, readbuf, offset, len,
&remote_protocol_packets
[PACKET_qXfer_siginfo_read]);
else
return remote_write_qxfer (ops, "siginfo", annex,
writebuf, offset, len,
&remote_protocol_packets
[PACKET_qXfer_siginfo_write]);
}
if (object == TARGET_OBJECT_STATIC_TRACE_DATA)
{
if (readbuf)
return remote_read_qxfer (ops, "statictrace", annex,
readbuf, offset, len,
&remote_protocol_packets
[PACKET_qXfer_statictrace_read]);
else
return -1;
}
/* Only handle flash writes. */
if (writebuf != NULL)
{
LONGEST xfered;
switch (object)
{
case TARGET_OBJECT_FLASH:
xfered = remote_flash_write (ops, offset, len, writebuf);
if (xfered > 0)
return xfered;
else if (xfered == 0 && errno == 0)
return 0;
else
return -1;
default:
return -1;
}
}
/* Map pre-existing objects onto letters. DO NOT do this for new
objects!!! Instead specify new query packets. */
switch (object)
{
case TARGET_OBJECT_AVR:
query_type = 'R';
break;
case TARGET_OBJECT_AUXV:
gdb_assert (annex == NULL);
return remote_read_qxfer (ops, "auxv", annex, readbuf, offset, len,
&remote_protocol_packets[PACKET_qXfer_auxv]);
case TARGET_OBJECT_AVAILABLE_FEATURES:
return remote_read_qxfer
(ops, "features", annex, readbuf, offset, len,
&remote_protocol_packets[PACKET_qXfer_features]);
case TARGET_OBJECT_LIBRARIES:
return remote_read_qxfer
(ops, "libraries", annex, readbuf, offset, len,
&remote_protocol_packets[PACKET_qXfer_libraries]);
case TARGET_OBJECT_LIBRARIES_SVR4:
return remote_read_qxfer
(ops, "libraries-svr4", annex, readbuf, offset, len,
&remote_protocol_packets[PACKET_qXfer_libraries_svr4]);
case TARGET_OBJECT_MEMORY_MAP:
gdb_assert (annex == NULL);
return remote_read_qxfer (ops, "memory-map", annex, readbuf, offset, len,
&remote_protocol_packets[PACKET_qXfer_memory_map]);
case TARGET_OBJECT_OSDATA:
/* Should only get here if we're connected. */
gdb_assert (remote_desc);
return remote_read_qxfer
(ops, "osdata", annex, readbuf, offset, len,
&remote_protocol_packets[PACKET_qXfer_osdata]);
case TARGET_OBJECT_THREADS:
gdb_assert (annex == NULL);
return remote_read_qxfer (ops, "threads", annex, readbuf, offset, len,
&remote_protocol_packets[PACKET_qXfer_threads]);
case TARGET_OBJECT_TRACEFRAME_INFO:
gdb_assert (annex == NULL);
return remote_read_qxfer
(ops, "traceframe-info", annex, readbuf, offset, len,
&remote_protocol_packets[PACKET_qXfer_traceframe_info]);
case TARGET_OBJECT_FDPIC:
return remote_read_qxfer (ops, "fdpic", annex, readbuf, offset, len,
&remote_protocol_packets[PACKET_qXfer_fdpic]);
default:
return -1;
}
/* Note: a zero OFFSET and LEN can be used to query the minimum
buffer size. */
if (offset == 0 && len == 0)
return (get_remote_packet_size ());
/* Minimum outbuf size is get_remote_packet_size (). If LEN is not
large enough let the caller deal with it. */
if (len < get_remote_packet_size ())
return -1;
len = get_remote_packet_size ();
/* Except for querying the minimum buffer size, target must be open. */
if (!remote_desc)
error (_("remote query is only available after target open"));
gdb_assert (annex != NULL);
gdb_assert (readbuf != NULL);
p2 = rs->buf;
*p2++ = 'q';
*p2++ = query_type;
/* We used one buffer char for the remote protocol q command and
another for the query type. As the remote protocol encapsulation
uses 4 chars plus one extra in case we are debugging
(remote_debug), we have PBUFZIZ - 7 left to pack the query
string. */
i = 0;
while (annex[i] && (i < (get_remote_packet_size () - 8)))
{
/* Bad caller may have sent forbidden characters. */
gdb_assert (isprint (annex[i]) && annex[i] != '$' && annex[i] != '#');
*p2++ = annex[i];
i++;
}
*p2 = '\0';
gdb_assert (annex[i] == '\0');
i = putpkt (rs->buf);
if (i < 0)
return i;
getpkt (&rs->buf, &rs->buf_size, 0);
strcpy ((char *) readbuf, rs->buf);
return strlen ((char *) readbuf);
}
static int
remote_search_memory (struct target_ops* ops,
CORE_ADDR start_addr, ULONGEST search_space_len,
const gdb_byte *pattern, ULONGEST pattern_len,
CORE_ADDR *found_addrp)
{
int addr_size = gdbarch_addr_bit (target_gdbarch) / 8;
struct remote_state *rs = get_remote_state ();
int max_size = get_memory_write_packet_size ();
struct packet_config *packet =
&remote_protocol_packets[PACKET_qSearch_memory];
/* Number of packet bytes used to encode the pattern;
this could be more than PATTERN_LEN due to escape characters. */
int escaped_pattern_len;
/* Amount of pattern that was encodable in the packet. */
int used_pattern_len;
int i;
int found;
ULONGEST found_addr;
/* Don't go to the target if we don't have to.
This is done before checking packet->support to avoid the possibility that
a success for this edge case means the facility works in general. */
if (pattern_len > search_space_len)
return 0;
if (pattern_len == 0)
{
*found_addrp = start_addr;
return 1;
}
/* If we already know the packet isn't supported, fall back to the simple
way of searching memory. */
if (packet->support == PACKET_DISABLE)
{
/* Target doesn't provided special support, fall back and use the
standard support (copy memory and do the search here). */
return simple_search_memory (ops, start_addr, search_space_len,
pattern, pattern_len, found_addrp);
}
/* Insert header. */
i = snprintf (rs->buf, max_size,
"qSearch:memory:%s;%s;",
phex_nz (start_addr, addr_size),
phex_nz (search_space_len, sizeof (search_space_len)));
max_size -= (i + 1);
/* Escape as much data as fits into rs->buf. */
escaped_pattern_len =
remote_escape_output (pattern, pattern_len, (rs->buf + i),
&used_pattern_len, max_size);
/* Bail if the pattern is too large. */
if (used_pattern_len != pattern_len)
error (_("Pattern is too large to transmit to remote target."));
if (putpkt_binary (rs->buf, i + escaped_pattern_len) < 0
|| getpkt_sane (&rs->buf, &rs->buf_size, 0) < 0
|| packet_ok (rs->buf, packet) != PACKET_OK)
{
/* The request may not have worked because the command is not
supported. If so, fall back to the simple way. */
if (packet->support == PACKET_DISABLE)
{
return simple_search_memory (ops, start_addr, search_space_len,
pattern, pattern_len, found_addrp);
}
return -1;
}
if (rs->buf[0] == '0')
found = 0;
else if (rs->buf[0] == '1')
{
found = 1;
if (rs->buf[1] != ',')
error (_("Unknown qSearch:memory reply: %s"), rs->buf);
unpack_varlen_hex (rs->buf + 2, &found_addr);
*found_addrp = found_addr;
}
else
error (_("Unknown qSearch:memory reply: %s"), rs->buf);
return found;
}
static void
remote_rcmd (char *command,
struct ui_file *outbuf)
{
struct remote_state *rs = get_remote_state ();
char *p = rs->buf;
if (!remote_desc)
error (_("remote rcmd is only available after target open"));
/* Send a NULL command across as an empty command. */
if (command == NULL)
command = "";
/* The query prefix. */
strcpy (rs->buf, "qRcmd,");
p = strchr (rs->buf, '\0');
if ((strlen (rs->buf) + strlen (command) * 2 + 8/*misc*/)
> get_remote_packet_size ())
error (_("\"monitor\" command ``%s'' is too long."), command);
/* Encode the actual command. */
bin2hex ((gdb_byte *) command, p, 0);
if (putpkt (rs->buf) < 0)
error (_("Communication problem with target."));
/* get/display the response */
while (1)
{
char *buf;
/* XXX - see also remote_get_noisy_reply(). */
rs->buf[0] = '\0';
getpkt (&rs->buf, &rs->buf_size, 0);
buf = rs->buf;
if (buf[0] == '\0')
error (_("Target does not support this command."));
if (buf[0] == 'O' && buf[1] != 'K')
{
remote_console_output (buf + 1); /* 'O' message from stub. */
continue;
}
if (strcmp (buf, "OK") == 0)
break;
if (strlen (buf) == 3 && buf[0] == 'E'
&& isdigit (buf[1]) && isdigit (buf[2]))
{
error (_("Protocol error with Rcmd"));
}
for (p = buf; p[0] != '\0' && p[1] != '\0'; p += 2)
{
char c = (fromhex (p[0]) << 4) + fromhex (p[1]);
fputc_unfiltered (c, outbuf);
}
break;
}
}
static VEC(mem_region_s) *
remote_memory_map (struct target_ops *ops)
{
VEC(mem_region_s) *result = NULL;
char *text = target_read_stralloc (&current_target,
TARGET_OBJECT_MEMORY_MAP, NULL);
if (text)
{
struct cleanup *back_to = make_cleanup (xfree, text);
result = parse_memory_map (text);
do_cleanups (back_to);
}
return result;
}
static void
packet_command (char *args, int from_tty)
{
struct remote_state *rs = get_remote_state ();
if (!remote_desc)
error (_("command can only be used with remote target"));
if (!args)
error (_("remote-packet command requires packet text as argument"));
puts_filtered ("sending: ");
print_packet (args);
puts_filtered ("\n");
putpkt (args);
getpkt (&rs->buf, &rs->buf_size, 0);
puts_filtered ("received: ");
print_packet (rs->buf);
puts_filtered ("\n");
}
#if 0
/* --------- UNIT_TEST for THREAD oriented PACKETS ------------------- */
static void display_thread_info (struct gdb_ext_thread_info *info);
static void threadset_test_cmd (char *cmd, int tty);
static void threadalive_test (char *cmd, int tty);
static void threadlist_test_cmd (char *cmd, int tty);
int get_and_display_threadinfo (threadref *ref);
static void threadinfo_test_cmd (char *cmd, int tty);
static int thread_display_step (threadref *ref, void *context);
static void threadlist_update_test_cmd (char *cmd, int tty);
static void init_remote_threadtests (void);
#define SAMPLE_THREAD 0x05060708 /* Truncated 64 bit threadid. */
static void
threadset_test_cmd (char *cmd, int tty)
{
int sample_thread = SAMPLE_THREAD;
printf_filtered (_("Remote threadset test\n"));
set_general_thread (sample_thread);
}
static void
threadalive_test (char *cmd, int tty)
{
int sample_thread = SAMPLE_THREAD;
int pid = ptid_get_pid (inferior_ptid);
ptid_t ptid = ptid_build (pid, 0, sample_thread);
if (remote_thread_alive (ptid))
printf_filtered ("PASS: Thread alive test\n");
else
printf_filtered ("FAIL: Thread alive test\n");
}
void output_threadid (char *title, threadref *ref);
void
output_threadid (char *title, threadref *ref)
{
char hexid[20];
pack_threadid (&hexid[0], ref); /* Convert threead id into hex. */
hexid[16] = 0;
printf_filtered ("%s %s\n", title, (&hexid[0]));
}
static void
threadlist_test_cmd (char *cmd, int tty)
{
int startflag = 1;
threadref nextthread;
int done, result_count;
threadref threadlist[3];
printf_filtered ("Remote Threadlist test\n");
if (!remote_get_threadlist (startflag, &nextthread, 3, &done,
&result_count, &threadlist[0]))
printf_filtered ("FAIL: threadlist test\n");
else
{
threadref *scan = threadlist;
threadref *limit = scan + result_count;
while (scan < limit)
output_threadid (" thread ", scan++);
}
}
void
display_thread_info (struct gdb_ext_thread_info *info)
{
output_threadid ("Threadid: ", &info->threadid);
printf_filtered ("Name: %s\n ", info->shortname);
printf_filtered ("State: %s\n", info->display);
printf_filtered ("other: %s\n\n", info->more_display);
}
int
get_and_display_threadinfo (threadref *ref)
{
int result;
int set;
struct gdb_ext_thread_info threadinfo;
set = TAG_THREADID | TAG_EXISTS | TAG_THREADNAME
| TAG_MOREDISPLAY | TAG_DISPLAY;
if (0 != (result = remote_get_threadinfo (ref, set, &threadinfo)))
display_thread_info (&threadinfo);
return result;
}
static void
threadinfo_test_cmd (char *cmd, int tty)
{
int athread = SAMPLE_THREAD;
threadref thread;
int set;
int_to_threadref (&thread, athread);
printf_filtered ("Remote Threadinfo test\n");
if (!get_and_display_threadinfo (&thread))
printf_filtered ("FAIL cannot get thread info\n");
}
static int
thread_display_step (threadref *ref, void *context)
{
/* output_threadid(" threadstep ",ref); *//* simple test */
return get_and_display_threadinfo (ref);
}
static void
threadlist_update_test_cmd (char *cmd, int tty)
{
printf_filtered ("Remote Threadlist update test\n");
remote_threadlist_iterator (thread_display_step, 0, CRAZY_MAX_THREADS);
}
static void
init_remote_threadtests (void)
{
add_com ("tlist", class_obscure, threadlist_test_cmd,
_("Fetch and print the remote list of "
"thread identifiers, one pkt only"));
add_com ("tinfo", class_obscure, threadinfo_test_cmd,
_("Fetch and display info about one thread"));
add_com ("tset", class_obscure, threadset_test_cmd,
_("Test setting to a different thread"));
add_com ("tupd", class_obscure, threadlist_update_test_cmd,
_("Iterate through updating all remote thread info"));
add_com ("talive", class_obscure, threadalive_test,
_(" Remote thread alive test "));
}
#endif /* 0 */
/* Convert a thread ID to a string. Returns the string in a static
buffer. */
static char *
remote_pid_to_str (struct target_ops *ops, ptid_t ptid)
{
static char buf[64];
struct remote_state *rs = get_remote_state ();
if (ptid_is_pid (ptid))
{
/* Printing an inferior target id. */
/* When multi-process extensions are off, there's no way in the
remote protocol to know the remote process id, if there's any
at all. There's one exception --- when we're connected with
target extended-remote, and we manually attached to a process
with "attach PID". We don't record anywhere a flag that
allows us to distinguish that case from the case of
connecting with extended-remote and the stub already being
attached to a process, and reporting yes to qAttached, hence
no smart special casing here. */
if (!remote_multi_process_p (rs))
{
xsnprintf (buf, sizeof buf, "Remote target");
return buf;
}
return normal_pid_to_str (ptid);
}
else
{
if (ptid_equal (magic_null_ptid, ptid))
xsnprintf (buf, sizeof buf, "Thread <main>");
else if (remote_multi_process_p (rs))
xsnprintf (buf, sizeof buf, "Thread %d.%ld",
ptid_get_pid (ptid), ptid_get_tid (ptid));
else
xsnprintf (buf, sizeof buf, "Thread %ld",
ptid_get_tid (ptid));
return buf;
}
}
/* Get the address of the thread local variable in OBJFILE which is
stored at OFFSET within the thread local storage for thread PTID. */
static CORE_ADDR
remote_get_thread_local_address (struct target_ops *ops,
ptid_t ptid, CORE_ADDR lm, CORE_ADDR offset)
{
if (remote_protocol_packets[PACKET_qGetTLSAddr].support != PACKET_DISABLE)
{
struct remote_state *rs = get_remote_state ();
char *p = rs->buf;
char *endp = rs->buf + get_remote_packet_size ();
enum packet_result result;
strcpy (p, "qGetTLSAddr:");
p += strlen (p);
p = write_ptid (p, endp, ptid);
*p++ = ',';
p += hexnumstr (p, offset);
*p++ = ',';
p += hexnumstr (p, lm);
*p++ = '\0';
putpkt (rs->buf);
getpkt (&rs->buf, &rs->buf_size, 0);
result = packet_ok (rs->buf,
&remote_protocol_packets[PACKET_qGetTLSAddr]);
if (result == PACKET_OK)
{
ULONGEST result;
unpack_varlen_hex (rs->buf, &result);
return result;
}
else if (result == PACKET_UNKNOWN)
throw_error (TLS_GENERIC_ERROR,
_("Remote target doesn't support qGetTLSAddr packet"));
else
throw_error (TLS_GENERIC_ERROR,
_("Remote target failed to process qGetTLSAddr request"));
}
else
throw_error (TLS_GENERIC_ERROR,
_("TLS not supported or disabled on this target"));
/* Not reached. */
return 0;
}
/* Provide thread local base, i.e. Thread Information Block address.
Returns 1 if ptid is found and thread_local_base is non zero. */
int
remote_get_tib_address (ptid_t ptid, CORE_ADDR *addr)
{
if (remote_protocol_packets[PACKET_qGetTIBAddr].support != PACKET_DISABLE)
{
struct remote_state *rs = get_remote_state ();
char *p = rs->buf;
char *endp = rs->buf + get_remote_packet_size ();
enum packet_result result;
strcpy (p, "qGetTIBAddr:");
p += strlen (p);
p = write_ptid (p, endp, ptid);
*p++ = '\0';
putpkt (rs->buf);
getpkt (&rs->buf, &rs->buf_size, 0);
result = packet_ok (rs->buf,
&remote_protocol_packets[PACKET_qGetTIBAddr]);
if (result == PACKET_OK)
{
ULONGEST result;
unpack_varlen_hex (rs->buf, &result);
if (addr)
*addr = (CORE_ADDR) result;
return 1;
}
else if (result == PACKET_UNKNOWN)
error (_("Remote target doesn't support qGetTIBAddr packet"));
else
error (_("Remote target failed to process qGetTIBAddr request"));
}
else
error (_("qGetTIBAddr not supported or disabled on this target"));
/* Not reached. */
return 0;
}
/* Support for inferring a target description based on the current
architecture and the size of a 'g' packet. While the 'g' packet
can have any size (since optional registers can be left off the
end), some sizes are easily recognizable given knowledge of the
approximate architecture. */
struct remote_g_packet_guess
{
int bytes;
const struct target_desc *tdesc;
};
typedef struct remote_g_packet_guess remote_g_packet_guess_s;
DEF_VEC_O(remote_g_packet_guess_s);
struct remote_g_packet_data
{
VEC(remote_g_packet_guess_s) *guesses;
};
static struct gdbarch_data *remote_g_packet_data_handle;
static void *
remote_g_packet_data_init (struct obstack *obstack)
{
return OBSTACK_ZALLOC (obstack, struct remote_g_packet_data);
}
void
register_remote_g_packet_guess (struct gdbarch *gdbarch, int bytes,
const struct target_desc *tdesc)
{
struct remote_g_packet_data *data
= gdbarch_data (gdbarch, remote_g_packet_data_handle);
struct remote_g_packet_guess new_guess, *guess;
int ix;
gdb_assert (tdesc != NULL);
for (ix = 0;
VEC_iterate (remote_g_packet_guess_s, data->guesses, ix, guess);
ix++)
if (guess->bytes == bytes)
internal_error (__FILE__, __LINE__,
_("Duplicate g packet description added for size %d"),
bytes);
new_guess.bytes = bytes;
new_guess.tdesc = tdesc;
VEC_safe_push (remote_g_packet_guess_s, data->guesses, &new_guess);
}
/* Return 1 if remote_read_description would do anything on this target
and architecture, 0 otherwise. */
static int
remote_read_description_p (struct target_ops *target)
{
struct remote_g_packet_data *data
= gdbarch_data (target_gdbarch, remote_g_packet_data_handle);
if (!VEC_empty (remote_g_packet_guess_s, data->guesses))
return 1;
return 0;
}
static const struct target_desc *
remote_read_description (struct target_ops *target)
{
struct remote_g_packet_data *data
= gdbarch_data (target_gdbarch, remote_g_packet_data_handle);
/* Do not try this during initial connection, when we do not know
whether there is a running but stopped thread. */
if (!target_has_execution || ptid_equal (inferior_ptid, null_ptid))
return NULL;
if (!VEC_empty (remote_g_packet_guess_s, data->guesses))
{
struct remote_g_packet_guess *guess;
int ix;
int bytes = send_g_packet ();
for (ix = 0;
VEC_iterate (remote_g_packet_guess_s, data->guesses, ix, guess);
ix++)
if (guess->bytes == bytes)
return guess->tdesc;
/* We discard the g packet. A minor optimization would be to
hold on to it, and fill the register cache once we have selected
an architecture, but it's too tricky to do safely. */
}
return NULL;
}
/* Remote file transfer support. This is host-initiated I/O, not
target-initiated; for target-initiated, see remote-fileio.c. */
/* If *LEFT is at least the length of STRING, copy STRING to
*BUFFER, update *BUFFER to point to the new end of the buffer, and
decrease *LEFT. Otherwise raise an error. */
static void
remote_buffer_add_string (char **buffer, int *left, char *string)
{
int len = strlen (string);
if (len > *left)
error (_("Packet too long for target."));
memcpy (*buffer, string, len);
*buffer += len;
*left -= len;
/* NUL-terminate the buffer as a convenience, if there is
room. */
if (*left)
**buffer = '\0';
}
/* If *LEFT is large enough, hex encode LEN bytes from BYTES into
*BUFFER, update *BUFFER to point to the new end of the buffer, and
decrease *LEFT. Otherwise raise an error. */
static void
remote_buffer_add_bytes (char **buffer, int *left, const gdb_byte *bytes,
int len)
{
if (2 * len > *left)
error (_("Packet too long for target."));
bin2hex (bytes, *buffer, len);
*buffer += 2 * len;
*left -= 2 * len;
/* NUL-terminate the buffer as a convenience, if there is
room. */
if (*left)
**buffer = '\0';
}
/* If *LEFT is large enough, convert VALUE to hex and add it to
*BUFFER, update *BUFFER to point to the new end of the buffer, and
decrease *LEFT. Otherwise raise an error. */
static void
remote_buffer_add_int (char **buffer, int *left, ULONGEST value)
{
int len = hexnumlen (value);
if (len > *left)
error (_("Packet too long for target."));
hexnumstr (*buffer, value);
*buffer += len;
*left -= len;
/* NUL-terminate the buffer as a convenience, if there is
room. */
if (*left)
**buffer = '\0';
}
/* Parse an I/O result packet from BUFFER. Set RETCODE to the return
value, *REMOTE_ERRNO to the remote error number or zero if none
was included, and *ATTACHMENT to point to the start of the annex
if any. The length of the packet isn't needed here; there may
be NUL bytes in BUFFER, but they will be after *ATTACHMENT.
Return 0 if the packet could be parsed, -1 if it could not. If
-1 is returned, the other variables may not be initialized. */
static int
remote_hostio_parse_result (char *buffer, int *retcode,
int *remote_errno, char **attachment)
{
char *p, *p2;
*remote_errno = 0;
*attachment = NULL;
if (buffer[0] != 'F')
return -1;
errno = 0;
*retcode = strtol (&buffer[1], &p, 16);
if (errno != 0 || p == &buffer[1])
return -1;
/* Check for ",errno". */
if (*p == ',')
{
errno = 0;
*remote_errno = strtol (p + 1, &p2, 16);
if (errno != 0 || p + 1 == p2)
return -1;
p = p2;
}
/* Check for ";attachment". If there is no attachment, the
packet should end here. */
if (*p == ';')
{
*attachment = p + 1;
return 0;
}
else if (*p == '\0')
return 0;
else
return -1;
}
/* Send a prepared I/O packet to the target and read its response.
The prepared packet is in the global RS->BUF before this function
is called, and the answer is there when we return.
COMMAND_BYTES is the length of the request to send, which may include
binary data. WHICH_PACKET is the packet configuration to check
before attempting a packet. If an error occurs, *REMOTE_ERRNO
is set to the error number and -1 is returned. Otherwise the value
returned by the function is returned.
ATTACHMENT and ATTACHMENT_LEN should be non-NULL if and only if an
attachment is expected; an error will be reported if there's a
mismatch. If one is found, *ATTACHMENT will be set to point into
the packet buffer and *ATTACHMENT_LEN will be set to the
attachment's length. */
static int
remote_hostio_send_command (int command_bytes, int which_packet,
int *remote_errno, char **attachment,
int *attachment_len)
{
struct remote_state *rs = get_remote_state ();
int ret, bytes_read;
char *attachment_tmp;
if (!remote_desc
|| remote_protocol_packets[which_packet].support == PACKET_DISABLE)
{
*remote_errno = FILEIO_ENOSYS;
return -1;
}
putpkt_binary (rs->buf, command_bytes);
bytes_read = getpkt_sane (&rs->buf, &rs->buf_size, 0);
/* If it timed out, something is wrong. Don't try to parse the
buffer. */
if (bytes_read < 0)
{
*remote_errno = FILEIO_EINVAL;
return -1;
}
switch (packet_ok (rs->buf, &remote_protocol_packets[which_packet]))
{
case PACKET_ERROR:
*remote_errno = FILEIO_EINVAL;
return -1;
case PACKET_UNKNOWN:
*remote_errno = FILEIO_ENOSYS;
return -1;
case PACKET_OK:
break;
}
if (remote_hostio_parse_result (rs->buf, &ret, remote_errno,
&attachment_tmp))
{
*remote_errno = FILEIO_EINVAL;
return -1;
}
/* Make sure we saw an attachment if and only if we expected one. */
if ((attachment_tmp == NULL && attachment != NULL)
|| (attachment_tmp != NULL && attachment == NULL))
{
*remote_errno = FILEIO_EINVAL;
return -1;
}
/* If an attachment was found, it must point into the packet buffer;
work out how many bytes there were. */
if (attachment_tmp != NULL)
{
*attachment = attachment_tmp;
*attachment_len = bytes_read - (*attachment - rs->buf);
}
return ret;
}
/* Open FILENAME on the remote target, using FLAGS and MODE. Return a
remote file descriptor, or -1 if an error occurs (and set
*REMOTE_ERRNO). */
static int
remote_hostio_open (const char *filename, int flags, int mode,
int *remote_errno)
{
struct remote_state *rs = get_remote_state ();
char *p = rs->buf;
int left = get_remote_packet_size () - 1;
remote_buffer_add_string (&p, &left, "vFile:open:");
remote_buffer_add_bytes (&p, &left, (const gdb_byte *) filename,
strlen (filename));
remote_buffer_add_string (&p, &left, ",");
remote_buffer_add_int (&p, &left, flags);
remote_buffer_add_string (&p, &left, ",");
remote_buffer_add_int (&p, &left, mode);
return remote_hostio_send_command (p - rs->buf, PACKET_vFile_open,
remote_errno, NULL, NULL);
}
/* Write up to LEN bytes from WRITE_BUF to FD on the remote target.
Return the number of bytes written, or -1 if an error occurs (and
set *REMOTE_ERRNO). */
static int
remote_hostio_pwrite (int fd, const gdb_byte *write_buf, int len,
ULONGEST offset, int *remote_errno)
{
struct remote_state *rs = get_remote_state ();
char *p = rs->buf;
int left = get_remote_packet_size ();
int out_len;
remote_buffer_add_string (&p, &left, "vFile:pwrite:");
remote_buffer_add_int (&p, &left, fd);
remote_buffer_add_string (&p, &left, ",");
remote_buffer_add_int (&p, &left, offset);
remote_buffer_add_string (&p, &left, ",");
p += remote_escape_output (write_buf, len, p, &out_len,
get_remote_packet_size () - (p - rs->buf));
return remote_hostio_send_command (p - rs->buf, PACKET_vFile_pwrite,
remote_errno, NULL, NULL);
}
/* Read up to LEN bytes FD on the remote target into READ_BUF
Return the number of bytes read, or -1 if an error occurs (and
set *REMOTE_ERRNO). */
static int
remote_hostio_pread (int fd, gdb_byte *read_buf, int len,
ULONGEST offset, int *remote_errno)
{
struct remote_state *rs = get_remote_state ();
char *p = rs->buf;
char *attachment;
int left = get_remote_packet_size ();
int ret, attachment_len;
int read_len;
remote_buffer_add_string (&p, &left, "vFile:pread:");
remote_buffer_add_int (&p, &left, fd);
remote_buffer_add_string (&p, &left, ",");
remote_buffer_add_int (&p, &left, len);
remote_buffer_add_string (&p, &left, ",");
remote_buffer_add_int (&p, &left, offset);
ret = remote_hostio_send_command (p - rs->buf, PACKET_vFile_pread,
remote_errno, &attachment,
&attachment_len);
if (ret < 0)
return ret;
read_len = remote_unescape_input (attachment, attachment_len,
read_buf, len);
if (read_len != ret)
error (_("Read returned %d, but %d bytes."), ret, (int) read_len);
return ret;
}
/* Close FD on the remote target. Return 0, or -1 if an error occurs
(and set *REMOTE_ERRNO). */
static int
remote_hostio_close (int fd, int *remote_errno)
{
struct remote_state *rs = get_remote_state ();
char *p = rs->buf;
int left = get_remote_packet_size () - 1;
remote_buffer_add_string (&p, &left, "vFile:close:");
remote_buffer_add_int (&p, &left, fd);
return remote_hostio_send_command (p - rs->buf, PACKET_vFile_close,
remote_errno, NULL, NULL);
}
/* Unlink FILENAME on the remote target. Return 0, or -1 if an error
occurs (and set *REMOTE_ERRNO). */
static int
remote_hostio_unlink (const char *filename, int *remote_errno)
{
struct remote_state *rs = get_remote_state ();
char *p = rs->buf;
int left = get_remote_packet_size () - 1;
remote_buffer_add_string (&p, &left, "vFile:unlink:");
remote_buffer_add_bytes (&p, &left, (const gdb_byte *) filename,
strlen (filename));
return remote_hostio_send_command (p - rs->buf, PACKET_vFile_unlink,
remote_errno, NULL, NULL);
}
static int
remote_fileio_errno_to_host (int errnum)
{
switch (errnum)
{
case FILEIO_EPERM:
return EPERM;
case FILEIO_ENOENT:
return ENOENT;
case FILEIO_EINTR:
return EINTR;
case FILEIO_EIO:
return EIO;
case FILEIO_EBADF:
return EBADF;
case FILEIO_EACCES:
return EACCES;
case FILEIO_EFAULT:
return EFAULT;
case FILEIO_EBUSY:
return EBUSY;
case FILEIO_EEXIST:
return EEXIST;
case FILEIO_ENODEV:
return ENODEV;
case FILEIO_ENOTDIR:
return ENOTDIR;
case FILEIO_EISDIR:
return EISDIR;
case FILEIO_EINVAL:
return EINVAL;
case FILEIO_ENFILE:
return ENFILE;
case FILEIO_EMFILE:
return EMFILE;
case FILEIO_EFBIG:
return EFBIG;
case FILEIO_ENOSPC:
return ENOSPC;
case FILEIO_ESPIPE:
return ESPIPE;
case FILEIO_EROFS:
return EROFS;
case FILEIO_ENOSYS:
return ENOSYS;
case FILEIO_ENAMETOOLONG:
return ENAMETOOLONG;
}
return -1;
}
static char *
remote_hostio_error (int errnum)
{
int host_error = remote_fileio_errno_to_host (errnum);
if (host_error == -1)
error (_("Unknown remote I/O error %d"), errnum);
else
error (_("Remote I/O error: %s"), safe_strerror (host_error));
}
static void
remote_hostio_close_cleanup (void *opaque)
{
int fd = *(int *) opaque;
int remote_errno;
remote_hostio_close (fd, &remote_errno);
}
static void *
remote_bfd_iovec_open (struct bfd *abfd, void *open_closure)
{
const char *filename = bfd_get_filename (abfd);
int fd, remote_errno;
int *stream;
gdb_assert (remote_filename_p (filename));
fd = remote_hostio_open (filename + 7, FILEIO_O_RDONLY, 0, &remote_errno);
if (fd == -1)
{
errno = remote_fileio_errno_to_host (remote_errno);
bfd_set_error (bfd_error_system_call);
return NULL;
}
stream = xmalloc (sizeof (int));
*stream = fd;
return stream;
}
static int
remote_bfd_iovec_close (struct bfd *abfd, void *stream)
{
int fd = *(int *)stream;
int remote_errno;
xfree (stream);
/* Ignore errors on close; these may happen if the remote
connection was already torn down. */
remote_hostio_close (fd, &remote_errno);
return 1;
}
static file_ptr
remote_bfd_iovec_pread (struct bfd *abfd, void *stream, void *buf,
file_ptr nbytes, file_ptr offset)
{
int fd = *(int *)stream;
int remote_errno;
file_ptr pos, bytes;
pos = 0;
while (nbytes > pos)
{
bytes = remote_hostio_pread (fd, (char *)buf + pos, nbytes - pos,
offset + pos, &remote_errno);
if (bytes == 0)
/* Success, but no bytes, means end-of-file. */
break;
if (bytes == -1)
{
errno = remote_fileio_errno_to_host (remote_errno);
bfd_set_error (bfd_error_system_call);
return -1;
}
pos += bytes;
}
return pos;
}
static int
remote_bfd_iovec_stat (struct bfd *abfd, void *stream, struct stat *sb)
{
/* FIXME: We should probably implement remote_hostio_stat. */
sb->st_size = INT_MAX;
return 0;
}
int
remote_filename_p (const char *filename)
{
return strncmp (filename, "remote:", 7) == 0;
}
bfd *
remote_bfd_open (const char *remote_file, const char *target)
{
return bfd_openr_iovec (remote_file, target,
remote_bfd_iovec_open, NULL,
remote_bfd_iovec_pread,
remote_bfd_iovec_close,
remote_bfd_iovec_stat);
}
void
remote_file_put (const char *local_file, const char *remote_file, int from_tty)
{
struct cleanup *back_to, *close_cleanup;
int retcode, fd, remote_errno, bytes, io_size;
FILE *file;
gdb_byte *buffer;
int bytes_in_buffer;
int saw_eof;
ULONGEST offset;
if (!remote_desc)
error (_("command can only be used with remote target"));
file = fopen (local_file, "rb");
if (file == NULL)
perror_with_name (local_file);
back_to = make_cleanup_fclose (file);
fd = remote_hostio_open (remote_file, (FILEIO_O_WRONLY | FILEIO_O_CREAT
| FILEIO_O_TRUNC),
0700, &remote_errno);
if (fd == -1)
remote_hostio_error (remote_errno);
/* Send up to this many bytes at once. They won't all fit in the
remote packet limit, so we'll transfer slightly fewer. */
io_size = get_remote_packet_size ();
buffer = xmalloc (io_size);
make_cleanup (xfree, buffer);
close_cleanup = make_cleanup (remote_hostio_close_cleanup, &fd);
bytes_in_buffer = 0;
saw_eof = 0;
offset = 0;
while (bytes_in_buffer || !saw_eof)
{
if (!saw_eof)
{
bytes = fread (buffer + bytes_in_buffer, 1,
io_size - bytes_in_buffer,
file);
if (bytes == 0)
{
if (ferror (file))
error (_("Error reading %s."), local_file);
else
{
/* EOF. Unless there is something still in the
buffer from the last iteration, we are done. */
saw_eof = 1;
if (bytes_in_buffer == 0)
break;
}
}
}
else
bytes = 0;
bytes += bytes_in_buffer;
bytes_in_buffer = 0;
retcode = remote_hostio_pwrite (fd, buffer, bytes,
offset, &remote_errno);
if (retcode < 0)
remote_hostio_error (remote_errno);
else if (retcode == 0)
error (_("Remote write of %d bytes returned 0!"), bytes);
else if (retcode < bytes)
{
/* Short write. Save the rest of the read data for the next
write. */
bytes_in_buffer = bytes - retcode;
memmove (buffer, buffer + retcode, bytes_in_buffer);
}
offset += retcode;
}
discard_cleanups (close_cleanup);
if (remote_hostio_close (fd, &remote_errno))
remote_hostio_error (remote_errno);
if (from_tty)
printf_filtered (_("Successfully sent file \"%s\".\n"), local_file);
do_cleanups (back_to);
}
void
remote_file_get (const char *remote_file, const char *local_file, int from_tty)
{
struct cleanup *back_to, *close_cleanup;
int fd, remote_errno, bytes, io_size;
FILE *file;
gdb_byte *buffer;
ULONGEST offset;
if (!remote_desc)
error (_("command can only be used with remote target"));
fd = remote_hostio_open (remote_file, FILEIO_O_RDONLY, 0, &remote_errno);
if (fd == -1)
remote_hostio_error (remote_errno);
file = fopen (local_file, "wb");
if (file == NULL)
perror_with_name (local_file);
back_to = make_cleanup_fclose (file);
/* Send up to this many bytes at once. They won't all fit in the
remote packet limit, so we'll transfer slightly fewer. */
io_size = get_remote_packet_size ();
buffer = xmalloc (io_size);
make_cleanup (xfree, buffer);
close_cleanup = make_cleanup (remote_hostio_close_cleanup, &fd);
offset = 0;
while (1)
{
bytes = remote_hostio_pread (fd, buffer, io_size, offset, &remote_errno);
if (bytes == 0)
/* Success, but no bytes, means end-of-file. */
break;
if (bytes == -1)
remote_hostio_error (remote_errno);
offset += bytes;
bytes = fwrite (buffer, 1, bytes, file);
if (bytes == 0)
perror_with_name (local_file);
}
discard_cleanups (close_cleanup);
if (remote_hostio_close (fd, &remote_errno))
remote_hostio_error (remote_errno);
if (from_tty)
printf_filtered (_("Successfully fetched file \"%s\".\n"), remote_file);
do_cleanups (back_to);
}
void
remote_file_delete (const char *remote_file, int from_tty)
{
int retcode, remote_errno;
if (!remote_desc)
error (_("command can only be used with remote target"));
retcode = remote_hostio_unlink (remote_file, &remote_errno);
if (retcode == -1)
remote_hostio_error (remote_errno);
if (from_tty)
printf_filtered (_("Successfully deleted file \"%s\".\n"), remote_file);
}
static void
remote_put_command (char *args, int from_tty)
{
struct cleanup *back_to;
char **argv;
if (args == NULL)
error_no_arg (_("file to put"));
argv = gdb_buildargv (args);
back_to = make_cleanup_freeargv (argv);
if (argv[0] == NULL || argv[1] == NULL || argv[2] != NULL)
error (_("Invalid parameters to remote put"));
remote_file_put (argv[0], argv[1], from_tty);
do_cleanups (back_to);
}
static void
remote_get_command (char *args, int from_tty)
{
struct cleanup *back_to;
char **argv;
if (args == NULL)
error_no_arg (_("file to get"));
argv = gdb_buildargv (args);
back_to = make_cleanup_freeargv (argv);
if (argv[0] == NULL || argv[1] == NULL || argv[2] != NULL)
error (_("Invalid parameters to remote get"));
remote_file_get (argv[0], argv[1], from_tty);
do_cleanups (back_to);
}
static void
remote_delete_command (char *args, int from_tty)
{
struct cleanup *back_to;
char **argv;
if (args == NULL)
error_no_arg (_("file to delete"));
argv = gdb_buildargv (args);
back_to = make_cleanup_freeargv (argv);
if (argv[0] == NULL || argv[1] != NULL)
error (_("Invalid parameters to remote delete"));
remote_file_delete (argv[0], from_tty);
do_cleanups (back_to);
}
static void
remote_command (char *args, int from_tty)
{
help_list (remote_cmdlist, "remote ", -1, gdb_stdout);
}
static int
remote_can_execute_reverse (void)
{
if (remote_protocol_packets[PACKET_bs].support == PACKET_ENABLE
|| remote_protocol_packets[PACKET_bc].support == PACKET_ENABLE)
return 1;
else
return 0;
}
static int
remote_supports_non_stop (void)
{
return 1;
}
static int
remote_supports_disable_randomization (void)
{
/* Only supported in extended mode. */
return 0;
}
static int
remote_supports_multi_process (void)
{
struct remote_state *rs = get_remote_state ();
return remote_multi_process_p (rs);
}
int
remote_supports_cond_tracepoints (void)
{
struct remote_state *rs = get_remote_state ();
return rs->cond_tracepoints;
}
int
remote_supports_fast_tracepoints (void)
{
struct remote_state *rs = get_remote_state ();
return rs->fast_tracepoints;
}
static int
remote_supports_static_tracepoints (void)
{
struct remote_state *rs = get_remote_state ();
return rs->static_tracepoints;
}
static int
remote_supports_install_in_trace (void)
{
struct remote_state *rs = get_remote_state ();
return rs->install_in_trace;
}
static int
remote_supports_enable_disable_tracepoint (void)
{
struct remote_state *rs = get_remote_state ();
return rs->enable_disable_tracepoints;
}
static int
remote_supports_string_tracing (void)
{
struct remote_state *rs = get_remote_state ();
return rs->string_tracing;
}
static void
remote_trace_init (void)
{
putpkt ("QTinit");
remote_get_noisy_reply (&target_buf, &target_buf_size);
if (strcmp (target_buf, "OK") != 0)
error (_("Target does not support this command."));
}
static void free_actions_list (char **actions_list);
static void free_actions_list_cleanup_wrapper (void *);
static void
free_actions_list_cleanup_wrapper (void *al)
{
free_actions_list (al);
}
static void
free_actions_list (char **actions_list)
{
int ndx;
if (actions_list == 0)
return;
for (ndx = 0; actions_list[ndx]; ndx++)
xfree (actions_list[ndx]);
xfree (actions_list);
}
/* Recursive routine to walk through command list including loops, and
download packets for each command. */
static void
remote_download_command_source (int num, ULONGEST addr,
struct command_line *cmds)
{
struct remote_state *rs = get_remote_state ();
struct command_line *cmd;
for (cmd = cmds; cmd; cmd = cmd->next)
{
QUIT; /* Allow user to bail out with ^C. */
strcpy (rs->buf, "QTDPsrc:");
encode_source_string (num, addr, "cmd", cmd->line,
rs->buf + strlen (rs->buf),
rs->buf_size - strlen (rs->buf));
putpkt (rs->buf);
remote_get_noisy_reply (&target_buf, &target_buf_size);
if (strcmp (target_buf, "OK"))
warning (_("Target does not support source download."));
if (cmd->control_type == while_control
|| cmd->control_type == while_stepping_control)
{
remote_download_command_source (num, addr, *cmd->body_list);
QUIT; /* Allow user to bail out with ^C. */
strcpy (rs->buf, "QTDPsrc:");
encode_source_string (num, addr, "cmd", "end",
rs->buf + strlen (rs->buf),
rs->buf_size - strlen (rs->buf));
putpkt (rs->buf);
remote_get_noisy_reply (&target_buf, &target_buf_size);
if (strcmp (target_buf, "OK"))
warning (_("Target does not support source download."));
}
}
}
static void
remote_download_tracepoint (struct bp_location *loc)
{
CORE_ADDR tpaddr;
char addrbuf[40];
char buf[2048];
char **tdp_actions;
char **stepping_actions;
int ndx;
struct cleanup *old_chain = NULL;
struct agent_expr *aexpr;
struct cleanup *aexpr_chain = NULL;
char *pkt;
struct breakpoint *b = loc->owner;
struct tracepoint *t = (struct tracepoint *) b;
encode_actions (loc->owner, loc, &tdp_actions, &stepping_actions);
old_chain = make_cleanup (free_actions_list_cleanup_wrapper,
tdp_actions);
(void) make_cleanup (free_actions_list_cleanup_wrapper,
stepping_actions);
tpaddr = loc->address;
sprintf_vma (addrbuf, tpaddr);
sprintf (buf, "QTDP:%x:%s:%c:%lx:%x", b->number,
addrbuf, /* address */
(b->enable_state == bp_enabled ? 'E' : 'D'),
t->step_count, t->pass_count);
/* Fast tracepoints are mostly handled by the target, but we can
tell the target how big of an instruction block should be moved
around. */
if (b->type == bp_fast_tracepoint)
{
/* Only test for support at download time; we may not know
target capabilities at definition time. */
if (remote_supports_fast_tracepoints ())
{
int isize;
if (gdbarch_fast_tracepoint_valid_at (target_gdbarch,
tpaddr, &isize, NULL))
sprintf (buf + strlen (buf), ":F%x", isize);
else
/* If it passed validation at definition but fails now,
something is very wrong. */
internal_error (__FILE__, __LINE__,
_("Fast tracepoint not "
"valid during download"));
}
else
/* Fast tracepoints are functionally identical to regular
tracepoints, so don't take lack of support as a reason to
give up on the trace run. */
warning (_("Target does not support fast tracepoints, "
"downloading %d as regular tracepoint"), b->number);
}
else if (b->type == bp_static_tracepoint)
{
/* Only test for support at download time; we may not know
target capabilities at definition time. */
if (remote_supports_static_tracepoints ())
{
struct static_tracepoint_marker marker;
if (target_static_tracepoint_marker_at (tpaddr, &marker))
strcat (buf, ":S");
else
error (_("Static tracepoint not valid during download"));
}
else
/* Fast tracepoints are functionally identical to regular
tracepoints, so don't take lack of support as a reason
to give up on the trace run. */
error (_("Target does not support static tracepoints"));
}
/* If the tracepoint has a conditional, make it into an agent
expression and append to the definition. */
if (loc->cond)
{
/* Only test support at download time, we may not know target
capabilities at definition time. */
if (remote_supports_cond_tracepoints ())
{
aexpr = gen_eval_for_expr (tpaddr, loc->cond);
aexpr_chain = make_cleanup_free_agent_expr (aexpr);
sprintf (buf + strlen (buf), ":X%x,", aexpr->len);
pkt = buf + strlen (buf);
for (ndx = 0; ndx < aexpr->len; ++ndx)
pkt = pack_hex_byte (pkt, aexpr->buf[ndx]);
*pkt = '\0';
do_cleanups (aexpr_chain);
}
else
warning (_("Target does not support conditional tracepoints, "
"ignoring tp %d cond"), b->number);
}
if (b->commands || *default_collect)
strcat (buf, "-");
putpkt (buf);
remote_get_noisy_reply (&target_buf, &target_buf_size);
if (strcmp (target_buf, "OK"))
error (_("Target does not support tracepoints."));
/* do_single_steps (t); */
if (tdp_actions)
{
for (ndx = 0; tdp_actions[ndx]; ndx++)
{
QUIT; /* Allow user to bail out with ^C. */
sprintf (buf, "QTDP:-%x:%s:%s%c",
b->number, addrbuf, /* address */
tdp_actions[ndx],
((tdp_actions[ndx + 1] || stepping_actions)
? '-' : 0));
putpkt (buf);
remote_get_noisy_reply (&target_buf,
&target_buf_size);
if (strcmp (target_buf, "OK"))
error (_("Error on target while setting tracepoints."));
}
}
if (stepping_actions)
{
for (ndx = 0; stepping_actions[ndx]; ndx++)
{
QUIT; /* Allow user to bail out with ^C. */
sprintf (buf, "QTDP:-%x:%s:%s%s%s",
b->number, addrbuf, /* address */
((ndx == 0) ? "S" : ""),
stepping_actions[ndx],
(stepping_actions[ndx + 1] ? "-" : ""));
putpkt (buf);
remote_get_noisy_reply (&target_buf,
&target_buf_size);
if (strcmp (target_buf, "OK"))
error (_("Error on target while setting tracepoints."));
}
}
if (remote_protocol_packets[PACKET_TracepointSource].support
== PACKET_ENABLE)
{
if (b->addr_string)
{
strcpy (buf, "QTDPsrc:");
encode_source_string (b->number, loc->address,
"at", b->addr_string, buf + strlen (buf),
2048 - strlen (buf));
putpkt (buf);
remote_get_noisy_reply (&target_buf, &target_buf_size);
if (strcmp (target_buf, "OK"))
warning (_("Target does not support source download."));
}
if (b->cond_string)
{
strcpy (buf, "QTDPsrc:");
encode_source_string (b->number, loc->address,
"cond", b->cond_string, buf + strlen (buf),
2048 - strlen (buf));
putpkt (buf);
remote_get_noisy_reply (&target_buf, &target_buf_size);
if (strcmp (target_buf, "OK"))
warning (_("Target does not support source download."));
}
remote_download_command_source (b->number, loc->address,
breakpoint_commands (b));
}
do_cleanups (old_chain);
}
static int
remote_can_download_tracepoint (void)
{
struct trace_status *ts = current_trace_status ();
int status = remote_get_trace_status (ts);
if (status == -1 || !ts->running_known || !ts->running)
return 0;
/* If we are in a tracing experiment, but remote stub doesn't support
installing tracepoint in trace, we have to return. */
if (!remote_supports_install_in_trace ())
return 0;
return 1;
}
static void
remote_download_trace_state_variable (struct trace_state_variable *tsv)
{
struct remote_state *rs = get_remote_state ();
char *p;
sprintf (rs->buf, "QTDV:%x:%s:%x:",
tsv->number, phex ((ULONGEST) tsv->initial_value, 8), tsv->builtin);
p = rs->buf + strlen (rs->buf);
if ((p - rs->buf) + strlen (tsv->name) * 2 >= get_remote_packet_size ())
error (_("Trace state variable name too long for tsv definition packet"));
p += 2 * bin2hex ((gdb_byte *) (tsv->name), p, 0);
*p++ = '\0';
putpkt (rs->buf);
remote_get_noisy_reply (&target_buf, &target_buf_size);
if (*target_buf == '\0')
error (_("Target does not support this command."));
if (strcmp (target_buf, "OK") != 0)
error (_("Error on target while downloading trace state variable."));
}
static void
remote_enable_tracepoint (struct bp_location *location)
{
struct remote_state *rs = get_remote_state ();
char addr_buf[40];
sprintf_vma (addr_buf, location->address);
sprintf (rs->buf, "QTEnable:%x:%s", location->owner->number, addr_buf);
putpkt (rs->buf);
remote_get_noisy_reply (&rs->buf, &rs->buf_size);
if (*rs->buf == '\0')
error (_("Target does not support enabling tracepoints while a trace run is ongoing."));
if (strcmp (rs->buf, "OK") != 0)
error (_("Error on target while enabling tracepoint."));
}
static void
remote_disable_tracepoint (struct bp_location *location)
{
struct remote_state *rs = get_remote_state ();
char addr_buf[40];
sprintf_vma (addr_buf, location->address);
sprintf (rs->buf, "QTDisable:%x:%s", location->owner->number, addr_buf);
putpkt (rs->buf);
remote_get_noisy_reply (&rs->buf, &rs->buf_size);
if (*rs->buf == '\0')
error (_("Target does not support disabling tracepoints while a trace run is ongoing."));
if (strcmp (rs->buf, "OK") != 0)
error (_("Error on target while disabling tracepoint."));
}
static void
remote_trace_set_readonly_regions (void)
{
asection *s;
bfd_size_type size;
bfd_vma vma;
int anysecs = 0;
int offset = 0;
if (!exec_bfd)
return; /* No information to give. */
strcpy (target_buf, "QTro");
for (s = exec_bfd->sections; s; s = s->next)
{
char tmp1[40], tmp2[40];
int sec_length;
if ((s->flags & SEC_LOAD) == 0 ||
/* (s->flags & SEC_CODE) == 0 || */
(s->flags & SEC_READONLY) == 0)
continue;
anysecs = 1;
vma = bfd_get_section_vma (,s);
size = bfd_get_section_size (s);
sprintf_vma (tmp1, vma);
sprintf_vma (tmp2, vma + size);
sec_length = 1 + strlen (tmp1) + 1 + strlen (tmp2);
if (offset + sec_length + 1 > target_buf_size)
{
if (remote_protocol_packets[PACKET_qXfer_traceframe_info].support
!= PACKET_ENABLE)
warning (_("\
Too many sections for read-only sections definition packet."));
break;
}
sprintf (target_buf + offset, ":%s,%s", tmp1, tmp2);
offset += sec_length;
}
if (anysecs)
{
putpkt (target_buf);
getpkt (&target_buf, &target_buf_size, 0);
}
}
static void
remote_trace_start (void)
{
putpkt ("QTStart");
remote_get_noisy_reply (&target_buf, &target_buf_size);
if (*target_buf == '\0')
error (_("Target does not support this command."));
if (strcmp (target_buf, "OK") != 0)
error (_("Bogus reply from target: %s"), target_buf);
}
static int
remote_get_trace_status (struct trace_status *ts)
{
/* Initialize it just to avoid a GCC false warning. */
char *p = NULL;
/* FIXME we need to get register block size some other way. */
extern int trace_regblock_size;
volatile struct gdb_exception ex;
trace_regblock_size = get_remote_arch_state ()->sizeof_g_packet;
putpkt ("qTStatus");
TRY_CATCH (ex, RETURN_MASK_ERROR)
{
p = remote_get_noisy_reply (&target_buf, &target_buf_size);
}
if (ex.reason < 0)
{
exception_fprintf (gdb_stderr, ex, "qTStatus: ");
return -1;
}
/* If the remote target doesn't do tracing, flag it. */
if (*p == '\0')
return -1;
/* We're working with a live target. */
ts->from_file = 0;
/* Set some defaults. */
ts->running_known = 0;
ts->stop_reason = trace_stop_reason_unknown;
ts->traceframe_count = -1;
ts->buffer_free = 0;
if (*p++ != 'T')
error (_("Bogus trace status reply from target: %s"), target_buf);
parse_trace_status (p, ts);
return ts->running;
}
void
remote_get_tracepoint_status (struct breakpoint *bp,
struct uploaded_tp *utp)
{
struct remote_state *rs = get_remote_state ();
char *reply;
struct bp_location *loc;
struct tracepoint *tp = (struct tracepoint *) bp;
if (tp)
{
tp->base.hit_count = 0;
tp->traceframe_usage = 0;
for (loc = tp->base.loc; loc; loc = loc->next)
{
/* If the tracepoint was never downloaded, don't go asking for
any status. */
if (tp->number_on_target == 0)
continue;
sprintf (rs->buf, "qTP:%x:%s", tp->number_on_target,
phex_nz (loc->address, 0));
putpkt (rs->buf);
reply = remote_get_noisy_reply (&target_buf, &target_buf_size);
if (reply && *reply)
{
if (*reply == 'V')
parse_tracepoint_status (reply + 1, bp, utp);
}
}
}
else if (utp)
{
utp->hit_count = 0;
utp->traceframe_usage = 0;
sprintf (rs->buf, "qTP:%x:%s", utp->number, phex_nz (utp->addr, 0));
putpkt (rs->buf);
reply = remote_get_noisy_reply (&target_buf, &target_buf_size);
if (reply && *reply)
{
if (*reply == 'V')
parse_tracepoint_status (reply + 1, bp, utp);
}
}
}
static void
remote_trace_stop (void)
{
putpkt ("QTStop");
remote_get_noisy_reply (&target_buf, &target_buf_size);
if (*target_buf == '\0')
error (_("Target does not support this command."));
if (strcmp (target_buf, "OK") != 0)
error (_("Bogus reply from target: %s"), target_buf);
}
static int
remote_trace_find (enum trace_find_type type, int num,
ULONGEST addr1, ULONGEST addr2,
int *tpp)
{
struct remote_state *rs = get_remote_state ();
char *p, *reply;
int target_frameno = -1, target_tracept = -1;
/* Lookups other than by absolute frame number depend on the current
trace selected, so make sure it is correct on the remote end
first. */
if (type != tfind_number)
set_remote_traceframe ();
p = rs->buf;
strcpy (p, "QTFrame:");
p = strchr (p, '\0');
switch (type)
{
case tfind_number:
sprintf (p, "%x", num);
break;
case tfind_pc:
sprintf (p, "pc:%s", phex_nz (addr1, 0));
break;
case tfind_tp:
sprintf (p, "tdp:%x", num);
break;
case tfind_range:
sprintf (p, "range:%s:%s", phex_nz (addr1, 0), phex_nz (addr2, 0));
break;
case tfind_outside:
sprintf (p, "outside:%s:%s", phex_nz (addr1, 0), phex_nz (addr2, 0));
break;
default:
error (_("Unknown trace find type %d"), type);
}
putpkt (rs->buf);
reply = remote_get_noisy_reply (&(rs->buf), &sizeof_pkt);
if (*reply == '\0')
error (_("Target does not support this command."));
while (reply && *reply)
switch (*reply)
{
case 'F':
p = ++reply;
target_frameno = (int) strtol (p, &reply, 16);
if (reply == p)
error (_("Unable to parse trace frame number"));
/* Don't update our remote traceframe number cache on failure
to select a remote traceframe. */
if (target_frameno == -1)
return -1;
break;
case 'T':
p = ++reply;
target_tracept = (int) strtol (p, &reply, 16);
if (reply == p)
error (_("Unable to parse tracepoint number"));
break;
case 'O': /* "OK"? */
if (reply[1] == 'K' && reply[2] == '\0')
reply += 2;
else
error (_("Bogus reply from target: %s"), reply);
break;
default:
error (_("Bogus reply from target: %s"), reply);
}
if (tpp)
*tpp = target_tracept;
remote_traceframe_number = target_frameno;
return target_frameno;
}
static int
remote_get_trace_state_variable_value (int tsvnum, LONGEST *val)
{
struct remote_state *rs = get_remote_state ();
char *reply;
ULONGEST uval;
set_remote_traceframe ();
sprintf (rs->buf, "qTV:%x", tsvnum);
putpkt (rs->buf);
reply = remote_get_noisy_reply (&target_buf, &target_buf_size);
if (reply && *reply)
{
if (*reply == 'V')
{
unpack_varlen_hex (reply + 1, &uval);
*val = (LONGEST) uval;
return 1;
}
}
return 0;
}
static int
remote_save_trace_data (const char *filename)
{
struct remote_state *rs = get_remote_state ();
char *p, *reply;
p = rs->buf;
strcpy (p, "QTSave:");
p += strlen (p);
if ((p - rs->buf) + strlen (filename) * 2 >= get_remote_packet_size ())
error (_("Remote file name too long for trace save packet"));
p += 2 * bin2hex ((gdb_byte *) filename, p, 0);
*p++ = '\0';
putpkt (rs->buf);
reply = remote_get_noisy_reply (&target_buf, &target_buf_size);
if (*reply == '\0')
error (_("Target does not support this command."));
if (strcmp (reply, "OK") != 0)
error (_("Bogus reply from target: %s"), reply);
return 0;
}
/* This is basically a memory transfer, but needs to be its own packet
because we don't know how the target actually organizes its trace
memory, plus we want to be able to ask for as much as possible, but
not be unhappy if we don't get as much as we ask for. */
static LONGEST
remote_get_raw_trace_data (gdb_byte *buf, ULONGEST offset, LONGEST len)
{
struct remote_state *rs = get_remote_state ();
char *reply;
char *p;
int rslt;
p = rs->buf;
strcpy (p, "qTBuffer:");
p += strlen (p);
p += hexnumstr (p, offset);
*p++ = ',';
p += hexnumstr (p, len);
*p++ = '\0';
putpkt (rs->buf);
reply = remote_get_noisy_reply (&target_buf, &target_buf_size);
if (reply && *reply)
{
/* 'l' by itself means we're at the end of the buffer and
there is nothing more to get. */
if (*reply == 'l')
return 0;
/* Convert the reply into binary. Limit the number of bytes to
convert according to our passed-in buffer size, rather than
what was returned in the packet; if the target is
unexpectedly generous and gives us a bigger reply than we
asked for, we don't want to crash. */
rslt = hex2bin (target_buf, buf, len);
return rslt;
}
/* Something went wrong, flag as an error. */
return -1;
}
static void
remote_set_disconnected_tracing (int val)
{
struct remote_state *rs = get_remote_state ();
if (rs->disconnected_tracing)
{
char *reply;
sprintf (rs->buf, "QTDisconnected:%x", val);
putpkt (rs->buf);
reply = remote_get_noisy_reply (&target_buf, &target_buf_size);
if (*reply == '\0')
error (_("Target does not support this command."));
if (strcmp (reply, "OK") != 0)
error (_("Bogus reply from target: %s"), reply);
}
else if (val)
warning (_("Target does not support disconnected tracing."));
}
static int
remote_core_of_thread (struct target_ops *ops, ptid_t ptid)
{
struct thread_info *info = find_thread_ptid (ptid);
if (info && info->private)
return info->private->core;
return -1;
}
static void
remote_set_circular_trace_buffer (int val)
{
struct remote_state *rs = get_remote_state ();
char *reply;
sprintf (rs->buf, "QTBuffer:circular:%x", val);
putpkt (rs->buf);
reply = remote_get_noisy_reply (&target_buf, &target_buf_size);
if (*reply == '\0')
error (_("Target does not support this command."));
if (strcmp (reply, "OK") != 0)
error (_("Bogus reply from target: %s"), reply);
}
static struct traceframe_info *
remote_traceframe_info (void)
{
char *text;
text = target_read_stralloc (&current_target,
TARGET_OBJECT_TRACEFRAME_INFO, NULL);
if (text != NULL)
{
struct traceframe_info *info;
struct cleanup *back_to = make_cleanup (xfree, text);
info = parse_traceframe_info (text);
do_cleanups (back_to);
return info;
}
return NULL;
}
/* Handle the qTMinFTPILen packet. Returns the minimum length of
instruction on which a fast tracepoint may be placed. Returns -1
if the packet is not supported, and 0 if the minimum instruction
length is unknown. */
static int
remote_get_min_fast_tracepoint_insn_len (void)
{
struct remote_state *rs = get_remote_state ();
char *reply;
sprintf (rs->buf, "qTMinFTPILen");
putpkt (rs->buf);
reply = remote_get_noisy_reply (&target_buf, &target_buf_size);
if (*reply == '\0')
return -1;
else
{
ULONGEST min_insn_len;
unpack_varlen_hex (reply, &min_insn_len);
return (int) min_insn_len;
}
}
static int
remote_set_trace_notes (char *user, char *notes, char *stop_notes)
{
struct remote_state *rs = get_remote_state ();
char *reply;
char *buf = rs->buf;
char *endbuf = rs->buf + get_remote_packet_size ();
int nbytes;
buf += xsnprintf (buf, endbuf - buf, "QTNotes:");
if (user)
{
buf += xsnprintf (buf, endbuf - buf, "user:");
nbytes = bin2hex (user, buf, 0);
buf += 2 * nbytes;
*buf++ = ';';
}
if (notes)
{
buf += xsnprintf (buf, endbuf - buf, "notes:");
nbytes = bin2hex (notes, buf, 0);
buf += 2 * nbytes;
*buf++ = ';';
}
if (stop_notes)
{
buf += xsnprintf (buf, endbuf - buf, "tstop:");
nbytes = bin2hex (stop_notes, buf, 0);
buf += 2 * nbytes;
*buf++ = ';';
}
/* Ensure the buffer is terminated. */
*buf = '\0';
putpkt (rs->buf);
reply = remote_get_noisy_reply (&target_buf, &target_buf_size);
if (*reply == '\0')
return 0;
if (strcmp (reply, "OK") != 0)
error (_("Bogus reply from target: %s"), reply);
return 1;
}
static void
init_remote_ops (void)
{
remote_ops.to_shortname = "remote";
remote_ops.to_longname = "Remote serial target in gdb-specific protocol";
remote_ops.to_doc =
"Use a remote computer via a serial line, using a gdb-specific protocol.\n\
Specify the serial device it is connected to\n\
(e.g. /dev/ttyS0, /dev/ttya, COM1, etc.).";
remote_ops.to_open = remote_open;
remote_ops.to_close = remote_close;
remote_ops.to_detach = remote_detach;
remote_ops.to_disconnect = remote_disconnect;
remote_ops.to_resume = remote_resume;
remote_ops.to_wait = remote_wait;
remote_ops.to_fetch_registers = remote_fetch_registers;
remote_ops.to_store_registers = remote_store_registers;
remote_ops.to_prepare_to_store = remote_prepare_to_store;
remote_ops.deprecated_xfer_memory = remote_xfer_memory;
remote_ops.to_files_info = remote_files_info;
remote_ops.to_insert_breakpoint = remote_insert_breakpoint;
remote_ops.to_remove_breakpoint = remote_remove_breakpoint;
remote_ops.to_stopped_by_watchpoint = remote_stopped_by_watchpoint;
remote_ops.to_stopped_data_address = remote_stopped_data_address;
remote_ops.to_can_use_hw_breakpoint = remote_check_watch_resources;
remote_ops.to_insert_hw_breakpoint = remote_insert_hw_breakpoint;
remote_ops.to_remove_hw_breakpoint = remote_remove_hw_breakpoint;
remote_ops.to_region_ok_for_hw_watchpoint
= remote_region_ok_for_hw_watchpoint;
remote_ops.to_insert_watchpoint = remote_insert_watchpoint;
remote_ops.to_remove_watchpoint = remote_remove_watchpoint;
remote_ops.to_kill = remote_kill;
remote_ops.to_load = generic_load;
remote_ops.to_mourn_inferior = remote_mourn;
remote_ops.to_pass_signals = remote_pass_signals;
remote_ops.to_thread_alive = remote_thread_alive;
remote_ops.to_find_new_threads = remote_threads_info;
remote_ops.to_pid_to_str = remote_pid_to_str;
remote_ops.to_extra_thread_info = remote_threads_extra_info;
remote_ops.to_get_ada_task_ptid = remote_get_ada_task_ptid;
remote_ops.to_stop = remote_stop;
remote_ops.to_xfer_partial = remote_xfer_partial;
remote_ops.to_rcmd = remote_rcmd;
remote_ops.to_log_command = serial_log_command;
remote_ops.to_get_thread_local_address = remote_get_thread_local_address;
remote_ops.to_stratum = process_stratum;
remote_ops.to_has_all_memory = default_child_has_all_memory;
remote_ops.to_has_memory = default_child_has_memory;
remote_ops.to_has_stack = default_child_has_stack;
remote_ops.to_has_registers = default_child_has_registers;
remote_ops.to_has_execution = default_child_has_execution;
remote_ops.to_has_thread_control = tc_schedlock; /* can lock scheduler */
remote_ops.to_can_execute_reverse = remote_can_execute_reverse;
remote_ops.to_magic = OPS_MAGIC;
remote_ops.to_memory_map = remote_memory_map;
remote_ops.to_flash_erase = remote_flash_erase;
remote_ops.to_flash_done = remote_flash_done;
remote_ops.to_read_description = remote_read_description;
remote_ops.to_search_memory = remote_search_memory;
remote_ops.to_can_async_p = remote_can_async_p;
remote_ops.to_is_async_p = remote_is_async_p;
remote_ops.to_async = remote_async;
remote_ops.to_terminal_inferior = remote_terminal_inferior;
remote_ops.to_terminal_ours = remote_terminal_ours;
remote_ops.to_supports_non_stop = remote_supports_non_stop;
remote_ops.to_supports_multi_process = remote_supports_multi_process;
remote_ops.to_supports_disable_randomization
= remote_supports_disable_randomization;
remote_ops.to_supports_enable_disable_tracepoint = remote_supports_enable_disable_tracepoint;
remote_ops.to_supports_string_tracing = remote_supports_string_tracing;
remote_ops.to_trace_init = remote_trace_init;
remote_ops.to_download_tracepoint = remote_download_tracepoint;
remote_ops.to_can_download_tracepoint = remote_can_download_tracepoint;
remote_ops.to_download_trace_state_variable
= remote_download_trace_state_variable;
remote_ops.to_enable_tracepoint = remote_enable_tracepoint;
remote_ops.to_disable_tracepoint = remote_disable_tracepoint;
remote_ops.to_trace_set_readonly_regions = remote_trace_set_readonly_regions;
remote_ops.to_trace_start = remote_trace_start;
remote_ops.to_get_trace_status = remote_get_trace_status;
remote_ops.to_get_tracepoint_status = remote_get_tracepoint_status;
remote_ops.to_trace_stop = remote_trace_stop;
remote_ops.to_trace_find = remote_trace_find;
remote_ops.to_get_trace_state_variable_value
= remote_get_trace_state_variable_value;
remote_ops.to_save_trace_data = remote_save_trace_data;
remote_ops.to_upload_tracepoints = remote_upload_tracepoints;
remote_ops.to_upload_trace_state_variables
= remote_upload_trace_state_variables;
remote_ops.to_get_raw_trace_data = remote_get_raw_trace_data;
remote_ops.to_get_min_fast_tracepoint_insn_len = remote_get_min_fast_tracepoint_insn_len;
remote_ops.to_set_disconnected_tracing = remote_set_disconnected_tracing;
remote_ops.to_set_circular_trace_buffer = remote_set_circular_trace_buffer;
remote_ops.to_set_trace_notes = remote_set_trace_notes;
remote_ops.to_core_of_thread = remote_core_of_thread;
remote_ops.to_verify_memory = remote_verify_memory;
remote_ops.to_get_tib_address = remote_get_tib_address;
remote_ops.to_set_permissions = remote_set_permissions;
remote_ops.to_static_tracepoint_marker_at
= remote_static_tracepoint_marker_at;
remote_ops.to_static_tracepoint_markers_by_strid
= remote_static_tracepoint_markers_by_strid;
remote_ops.to_traceframe_info = remote_traceframe_info;
}
/* Set up the extended remote vector by making a copy of the standard
remote vector and adding to it. */
static void
init_extended_remote_ops (void)
{
extended_remote_ops = remote_ops;
extended_remote_ops.to_shortname = "extended-remote";
extended_remote_ops.to_longname =
"Extended remote serial target in gdb-specific protocol";
extended_remote_ops.to_doc =
"Use a remote computer via a serial line, using a gdb-specific protocol.\n\
Specify the serial device it is connected to (e.g. /dev/ttya).";
extended_remote_ops.to_open = extended_remote_open;
extended_remote_ops.to_create_inferior = extended_remote_create_inferior;
extended_remote_ops.to_mourn_inferior = extended_remote_mourn;
extended_remote_ops.to_detach = extended_remote_detach;
extended_remote_ops.to_attach = extended_remote_attach;
extended_remote_ops.to_kill = extended_remote_kill;
extended_remote_ops.to_supports_disable_randomization
= extended_remote_supports_disable_randomization;
}
static int
remote_can_async_p (void)
{
if (!target_async_permitted)
/* We only enable async when the user specifically asks for it. */
return 0;
/* We're async whenever the serial device is. */
return serial_can_async_p (remote_desc);
}
static int
remote_is_async_p (void)
{
if (!target_async_permitted)
/* We only enable async when the user specifically asks for it. */
return 0;
/* We're async whenever the serial device is. */
return serial_is_async_p (remote_desc);
}
/* Pass the SERIAL event on and up to the client. One day this code
will be able to delay notifying the client of an event until the
point where an entire packet has been received. */
static void (*async_client_callback) (enum inferior_event_type event_type,
void *context);
static void *async_client_context;
static serial_event_ftype remote_async_serial_handler;
static void
remote_async_serial_handler (struct serial *scb, void *context)
{
/* Don't propogate error information up to the client. Instead let
the client find out about the error by querying the target. */
async_client_callback (INF_REG_EVENT, async_client_context);
}
static void
remote_async_inferior_event_handler (gdb_client_data data)
{
inferior_event_handler (INF_REG_EVENT, NULL);
}
static void
remote_async_get_pending_events_handler (gdb_client_data data)
{
remote_get_pending_stop_replies ();
}
static void
remote_async (void (*callback) (enum inferior_event_type event_type,
void *context), void *context)
{
if (callback != NULL)
{
serial_async (remote_desc, remote_async_serial_handler, NULL);
async_client_callback = callback;
async_client_context = context;
}
else
serial_async (remote_desc, NULL, NULL);
}
static void
set_remote_cmd (char *args, int from_tty)
{
help_list (remote_set_cmdlist, "set remote ", -1, gdb_stdout);
}
static void
show_remote_cmd (char *args, int from_tty)
{
/* We can't just use cmd_show_list here, because we want to skip
the redundant "show remote Z-packet" and the legacy aliases. */
struct cleanup *showlist_chain;
struct cmd_list_element *list = remote_show_cmdlist;
struct ui_out *uiout = current_uiout;
showlist_chain = make_cleanup_ui_out_tuple_begin_end (uiout, "showlist");
for (; list != NULL; list = list->next)
if (strcmp (list->name, "Z-packet") == 0)
continue;
else if (list->type == not_set_cmd)
/* Alias commands are exactly like the original, except they
don't have the normal type. */
continue;
else
{
struct cleanup *option_chain
= make_cleanup_ui_out_tuple_begin_end (uiout, "option");
ui_out_field_string (uiout, "name", list->name);
ui_out_text (uiout, ": ");
if (list->type == show_cmd)
do_setshow_command ((char *) NULL, from_tty, list);
else
cmd_func (list, NULL, from_tty);
/* Close the tuple. */
do_cleanups (option_chain);
}
/* Close the tuple. */
do_cleanups (showlist_chain);
}
/* Function to be called whenever a new objfile (shlib) is detected. */
static void
remote_new_objfile (struct objfile *objfile)
{
if (remote_desc != 0) /* Have a remote connection. */
remote_check_symbols (objfile);
}
/* Pull all the tracepoints defined on the target and create local
data structures representing them. We don't want to create real
tracepoints yet, we don't want to mess up the user's existing
collection. */
static int
remote_upload_tracepoints (struct uploaded_tp **utpp)
{
struct remote_state *rs = get_remote_state ();
char *p;
/* Ask for a first packet of tracepoint definition. */
putpkt ("qTfP");
getpkt (&rs->buf, &rs->buf_size, 0);
p = rs->buf;
while (*p && *p != 'l')
{
parse_tracepoint_definition (p, utpp);
/* Ask for another packet of tracepoint definition. */
putpkt ("qTsP");
getpkt (&rs->buf, &rs->buf_size, 0);
p = rs->buf;
}
return 0;
}
static int
remote_upload_trace_state_variables (struct uploaded_tsv **utsvp)
{
struct remote_state *rs = get_remote_state ();
char *p;
/* Ask for a first packet of variable definition. */
putpkt ("qTfV");
getpkt (&rs->buf, &rs->buf_size, 0);
p = rs->buf;
while (*p && *p != 'l')
{
parse_tsv_definition (p, utsvp);
/* Ask for another packet of variable definition. */
putpkt ("qTsV");
getpkt (&rs->buf, &rs->buf_size, 0);
p = rs->buf;
}
return 0;
}
void
_initialize_remote (void)
{
struct remote_state *rs;
struct cmd_list_element *cmd;
char *cmd_name;
/* architecture specific data */
remote_gdbarch_data_handle =
gdbarch_data_register_post_init (init_remote_state);
remote_g_packet_data_handle =
gdbarch_data_register_pre_init (remote_g_packet_data_init);
/* Initialize the per-target state. At the moment there is only one
of these, not one per target. Only one target is active at a
time. The default buffer size is unimportant; it will be expanded
whenever a larger buffer is needed. */
rs = get_remote_state_raw ();
rs->buf_size = 400;
rs->buf = xmalloc (rs->buf_size);
init_remote_ops ();
add_target (&remote_ops);
init_extended_remote_ops ();
add_target (&extended_remote_ops);
/* Hook into new objfile notification. */
observer_attach_new_objfile (remote_new_objfile);
/* Set up signal handlers. */
sigint_remote_token =
create_async_signal_handler (async_remote_interrupt, NULL);
sigint_remote_twice_token =
create_async_signal_handler (async_remote_interrupt_twice, NULL);
#if 0
init_remote_threadtests ();
#endif
/* set/show remote ... */
add_prefix_cmd ("remote", class_maintenance, set_remote_cmd, _("\
Remote protocol specific variables\n\
Configure various remote-protocol specific variables such as\n\
the packets being used"),
&remote_set_cmdlist, "set remote ",
0 /* allow-unknown */, &setlist);
add_prefix_cmd ("remote", class_maintenance, show_remote_cmd, _("\
Remote protocol specific variables\n\
Configure various remote-protocol specific variables such as\n\
the packets being used"),
&remote_show_cmdlist, "show remote ",
0 /* allow-unknown */, &showlist);
add_cmd ("compare-sections", class_obscure, compare_sections_command, _("\
Compare section data on target to the exec file.\n\
Argument is a single section name (default: all loaded sections)."),
&cmdlist);
add_cmd ("packet", class_maintenance, packet_command, _("\
Send an arbitrary packet to a remote target.\n\
maintenance packet TEXT\n\
If GDB is talking to an inferior via the GDB serial protocol, then\n\
this command sends the string TEXT to the inferior, and displays the\n\
response packet. GDB supplies the initial `$' character, and the\n\
terminating `#' character and checksum."),
&maintenancelist);
add_setshow_boolean_cmd ("remotebreak", no_class, &remote_break, _("\
Set whether to send break if interrupted."), _("\
Show whether to send break if interrupted."), _("\
If set, a break, instead of a cntrl-c, is sent to the remote target."),
set_remotebreak, show_remotebreak,
&setlist, &showlist);
cmd_name = "remotebreak";
cmd = lookup_cmd (&cmd_name, setlist, "", -1, 1);
deprecate_cmd (cmd, "set remote interrupt-sequence");
cmd_name = "remotebreak"; /* needed because lookup_cmd updates the pointer */
cmd = lookup_cmd (&cmd_name, showlist, "", -1, 1);
deprecate_cmd (cmd, "show remote interrupt-sequence");
add_setshow_enum_cmd ("interrupt-sequence", class_support,
interrupt_sequence_modes, &interrupt_sequence_mode,
_("\
Set interrupt sequence to remote target."), _("\
Show interrupt sequence to remote target."), _("\
Valid value is \"Ctrl-C\", \"BREAK\" or \"BREAK-g\". The default is \"Ctrl-C\"."),
NULL, show_interrupt_sequence,
&remote_set_cmdlist,
&remote_show_cmdlist);
add_setshow_boolean_cmd ("interrupt-on-connect", class_support,
&interrupt_on_connect, _("\
Set whether interrupt-sequence is sent to remote target when gdb connects to."), _(" \
Show whether interrupt-sequence is sent to remote target when gdb connects to."), _(" \
If set, interrupt sequence is sent to remote target."),
NULL, NULL,
&remote_set_cmdlist, &remote_show_cmdlist);
/* Install commands for configuring memory read/write packets. */
add_cmd ("remotewritesize", no_class, set_memory_write_packet_size, _("\
Set the maximum number of bytes per memory write packet (deprecated)."),
&setlist);
add_cmd ("remotewritesize", no_class, show_memory_write_packet_size, _("\
Show the maximum number of bytes per memory write packet (deprecated)."),
&showlist);
add_cmd ("memory-write-packet-size", no_class,
set_memory_write_packet_size, _("\
Set the maximum number of bytes per memory-write packet.\n\
Specify the number of bytes in a packet or 0 (zero) for the\n\
default packet size. The actual limit is further reduced\n\
dependent on the target. Specify ``fixed'' to disable the\n\
further restriction and ``limit'' to enable that restriction."),
&remote_set_cmdlist);
add_cmd ("memory-read-packet-size", no_class,
set_memory_read_packet_size, _("\
Set the maximum number of bytes per memory-read packet.\n\
Specify the number of bytes in a packet or 0 (zero) for the\n\
default packet size. The actual limit is further reduced\n\
dependent on the target. Specify ``fixed'' to disable the\n\
further restriction and ``limit'' to enable that restriction."),
&remote_set_cmdlist);
add_cmd ("memory-write-packet-size", no_class,
show_memory_write_packet_size,
_("Show the maximum number of bytes per memory-write packet."),
&remote_show_cmdlist);
add_cmd ("memory-read-packet-size", no_class,
show_memory_read_packet_size,
_("Show the maximum number of bytes per memory-read packet."),
&remote_show_cmdlist);
add_setshow_zinteger_cmd ("hardware-watchpoint-limit", no_class,
&remote_hw_watchpoint_limit, _("\
Set the maximum number of target hardware watchpoints."), _("\
Show the maximum number of target hardware watchpoints."), _("\
Specify a negative limit for unlimited."),
NULL, NULL, /* FIXME: i18n: The maximum
number of target hardware
watchpoints is %s. */
&remote_set_cmdlist, &remote_show_cmdlist);
add_setshow_zinteger_cmd ("hardware-watchpoint-length-limit", no_class,
&remote_hw_watchpoint_length_limit, _("\
Set the maximum length (in bytes) of a target hardware watchpoint."), _("\
Show the maximum length (in bytes) of a target hardware watchpoint."), _("\
Specify a negative limit for unlimited."),
NULL, NULL, /* FIXME: i18n: The maximum
length (in bytes) of a target
hardware watchpoint is %s. */
&remote_set_cmdlist, &remote_show_cmdlist);
add_setshow_zinteger_cmd ("hardware-breakpoint-limit", no_class,
&remote_hw_breakpoint_limit, _("\
Set the maximum number of target hardware breakpoints."), _("\
Show the maximum number of target hardware breakpoints."), _("\
Specify a negative limit for unlimited."),
NULL, NULL, /* FIXME: i18n: The maximum
number of target hardware
breakpoints is %s. */
&remote_set_cmdlist, &remote_show_cmdlist);
add_setshow_integer_cmd ("remoteaddresssize", class_obscure,
&remote_address_size, _("\
Set the maximum size of the address (in bits) in a memory packet."), _("\
Show the maximum size of the address (in bits) in a memory packet."), NULL,
NULL,
NULL, /* FIXME: i18n: */
&setlist, &showlist);
add_packet_config_cmd (&remote_protocol_packets[PACKET_X],
"X", "binary-download", 1);
add_packet_config_cmd (&remote_protocol_packets[PACKET_vCont],
"vCont", "verbose-resume", 0);
add_packet_config_cmd (&remote_protocol_packets[PACKET_QPassSignals],
"QPassSignals", "pass-signals", 0);
add_packet_config_cmd (&remote_protocol_packets[PACKET_qSymbol],
"qSymbol", "symbol-lookup", 0);
add_packet_config_cmd (&remote_protocol_packets[PACKET_P],
"P", "set-register", 1);
add_packet_config_cmd (&remote_protocol_packets[PACKET_p],
"p", "fetch-register", 1);
add_packet_config_cmd (&remote_protocol_packets[PACKET_Z0],
"Z0", "software-breakpoint", 0);
add_packet_config_cmd (&remote_protocol_packets[PACKET_Z1],
"Z1", "hardware-breakpoint", 0);
add_packet_config_cmd (&remote_protocol_packets[PACKET_Z2],
"Z2", "write-watchpoint", 0);
add_packet_config_cmd (&remote_protocol_packets[PACKET_Z3],
"Z3", "read-watchpoint", 0);
add_packet_config_cmd (&remote_protocol_packets[PACKET_Z4],
"Z4", "access-watchpoint", 0);
add_packet_config_cmd (&remote_protocol_packets[PACKET_qXfer_auxv],
"qXfer:auxv:read", "read-aux-vector", 0);
add_packet_config_cmd (&remote_protocol_packets[PACKET_qXfer_features],
"qXfer:features:read", "target-features", 0);
add_packet_config_cmd (&remote_protocol_packets[PACKET_qXfer_libraries],
"qXfer:libraries:read", "library-info", 0);
add_packet_config_cmd (&remote_protocol_packets[PACKET_qXfer_libraries_svr4],
"qXfer:libraries-svr4:read", "library-info-svr4", 0);
add_packet_config_cmd (&remote_protocol_packets[PACKET_qXfer_memory_map],
"qXfer:memory-map:read", "memory-map", 0);
add_packet_config_cmd (&remote_protocol_packets[PACKET_qXfer_spu_read],
"qXfer:spu:read", "read-spu-object", 0);
add_packet_config_cmd (&remote_protocol_packets[PACKET_qXfer_spu_write],
"qXfer:spu:write", "write-spu-object", 0);
add_packet_config_cmd (&remote_protocol_packets[PACKET_qXfer_osdata],
"qXfer:osdata:read", "osdata", 0);
add_packet_config_cmd (&remote_protocol_packets[PACKET_qXfer_threads],
"qXfer:threads:read", "threads", 0);
add_packet_config_cmd (&remote_protocol_packets[PACKET_qXfer_siginfo_read],
"qXfer:siginfo:read", "read-siginfo-object", 0);
add_packet_config_cmd (&remote_protocol_packets[PACKET_qXfer_siginfo_write],
"qXfer:siginfo:write", "write-siginfo-object", 0);
add_packet_config_cmd
(&remote_protocol_packets[PACKET_qXfer_traceframe_info],
"qXfer:trace-frame-info:read", "traceframe-info", 0);
add_packet_config_cmd (&remote_protocol_packets[PACKET_qGetTLSAddr],
"qGetTLSAddr", "get-thread-local-storage-address",
0);
add_packet_config_cmd (&remote_protocol_packets[PACKET_qGetTIBAddr],
"qGetTIBAddr", "get-thread-information-block-address",
0);
add_packet_config_cmd (&remote_protocol_packets[PACKET_bc],
"bc", "reverse-continue", 0);
add_packet_config_cmd (&remote_protocol_packets[PACKET_bs],
"bs", "reverse-step", 0);
add_packet_config_cmd (&remote_protocol_packets[PACKET_qSupported],
"qSupported", "supported-packets", 0);
add_packet_config_cmd (&remote_protocol_packets[PACKET_qSearch_memory],
"qSearch:memory", "search-memory", 0);
add_packet_config_cmd (&remote_protocol_packets[PACKET_vFile_open],
"vFile:open", "hostio-open", 0);
add_packet_config_cmd (&remote_protocol_packets[PACKET_vFile_pread],
"vFile:pread", "hostio-pread", 0);
add_packet_config_cmd (&remote_protocol_packets[PACKET_vFile_pwrite],
"vFile:pwrite", "hostio-pwrite", 0);
add_packet_config_cmd (&remote_protocol_packets[PACKET_vFile_close],
"vFile:close", "hostio-close", 0);
add_packet_config_cmd (&remote_protocol_packets[PACKET_vFile_unlink],
"vFile:unlink", "hostio-unlink", 0);
add_packet_config_cmd (&remote_protocol_packets[PACKET_vAttach],
"vAttach", "attach", 0);
add_packet_config_cmd (&remote_protocol_packets[PACKET_vRun],
"vRun", "run", 0);
add_packet_config_cmd (&remote_protocol_packets[PACKET_QStartNoAckMode],
"QStartNoAckMode", "noack", 0);
add_packet_config_cmd (&remote_protocol_packets[PACKET_vKill],
"vKill", "kill", 0);
add_packet_config_cmd (&remote_protocol_packets[PACKET_qAttached],
"qAttached", "query-attached", 0);
add_packet_config_cmd (&remote_protocol_packets[PACKET_ConditionalTracepoints],
"ConditionalTracepoints",
"conditional-tracepoints", 0);
add_packet_config_cmd (&remote_protocol_packets[PACKET_FastTracepoints],
"FastTracepoints", "fast-tracepoints", 0);
add_packet_config_cmd (&remote_protocol_packets[PACKET_TracepointSource],
"TracepointSource", "TracepointSource", 0);
add_packet_config_cmd (&remote_protocol_packets[PACKET_QAllow],
"QAllow", "allow", 0);
add_packet_config_cmd (&remote_protocol_packets[PACKET_StaticTracepoints],
"StaticTracepoints", "static-tracepoints", 0);
add_packet_config_cmd (&remote_protocol_packets[PACKET_InstallInTrace],
"InstallInTrace", "install-in-trace", 0);
add_packet_config_cmd (&remote_protocol_packets[PACKET_qXfer_statictrace_read],
"qXfer:statictrace:read", "read-sdata-object", 0);
add_packet_config_cmd (&remote_protocol_packets[PACKET_qXfer_fdpic],
"qXfer:fdpic:read", "read-fdpic-loadmap", 0);
add_packet_config_cmd (&remote_protocol_packets[PACKET_QDisableRandomization],
"QDisableRandomization", "disable-randomization", 0);
/* Keep the old ``set remote Z-packet ...'' working. Each individual
Z sub-packet has its own set and show commands, but users may
have sets to this variable in their .gdbinit files (or in their
documentation). */
add_setshow_auto_boolean_cmd ("Z-packet", class_obscure,
&remote_Z_packet_detect, _("\
Set use of remote protocol `Z' packets"), _("\
Show use of remote protocol `Z' packets "), _("\
When set, GDB will attempt to use the remote breakpoint and watchpoint\n\
packets."),
set_remote_protocol_Z_packet_cmd,
show_remote_protocol_Z_packet_cmd,
/* FIXME: i18n: Use of remote protocol
`Z' packets is %s. */
&remote_set_cmdlist, &remote_show_cmdlist);
add_prefix_cmd ("remote", class_files, remote_command, _("\
Manipulate files on the remote system\n\
Transfer files to and from the remote target system."),
&remote_cmdlist, "remote ",
0 /* allow-unknown */, &cmdlist);
add_cmd ("put", class_files, remote_put_command,
_("Copy a local file to the remote system."),
&remote_cmdlist);
add_cmd ("get", class_files, remote_get_command,
_("Copy a remote file to the local system."),
&remote_cmdlist);
add_cmd ("delete", class_files, remote_delete_command,
_("Delete a remote file."),
&remote_cmdlist);
remote_exec_file = xstrdup ("");
add_setshow_string_noescape_cmd ("exec-file", class_files,
&remote_exec_file, _("\
Set the remote pathname for \"run\""), _("\
Show the remote pathname for \"run\""), NULL, NULL, NULL,
&remote_set_cmdlist, &remote_show_cmdlist);
/* Eventually initialize fileio. See fileio.c */
initialize_remote_fileio (remote_set_cmdlist, remote_show_cmdlist);
/* Take advantage of the fact that the LWP field is not used, to tag
special ptids with it set to != 0. */
magic_null_ptid = ptid_build (42000, 1, -1);
not_sent_ptid = ptid_build (42000, 1, -2);
any_thread_ptid = ptid_build (42000, 1, 0);
target_buf_size = 2048;
target_buf = xmalloc (target_buf_size);
}
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