binutils-gdb/gdb/remote-sds.c

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/* Remote target communications for serial-line targets using SDS' protocol.
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Copyright 1997, 1998, 1999, 2000, 2001, 2002 Free Software
Foundation, Inc.
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This file is part of GDB.
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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 2 of the License, or
(at your option) any later version.
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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.
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You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
/* This interface was written by studying the behavior of the SDS
monitor on an ADS 821/860 board, and by consulting the
documentation of the monitor that is available on Motorola's web
site. -sts 8/13/97 */
#include "defs.h"
#include "gdb_string.h"
#include <fcntl.h>
#include "frame.h"
#include "inferior.h"
#include "bfd.h"
#include "symfile.h"
#include "target.h"
#include "gdbcmd.h"
#include "objfiles.h"
#include "gdb-stabs.h"
#include "gdbthread.h"
#include "gdbcore.h"
#include "regcache.h"
#ifdef USG
#include <sys/types.h>
#endif
#include <signal.h>
#include "serial.h"
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extern void _initialize_remote_sds (void);
/* Declarations of local functions. */
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static int sds_write_bytes (CORE_ADDR, char *, int);
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static int sds_read_bytes (CORE_ADDR, char *, int);
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static void sds_files_info (struct target_ops *ignore);
* exec.c (xfer_memory): Add attrib argument. * infptrace.c (child_xfer_memory): Likewise. * monitor.c (monitor_xfer_memory): Likewise. * remote-adapt.c (adapt_xfer_inferior_memory): Likewise. * remote-array.c (array_xfer_memory): Likewise. * remote-bug.c (bug_xfer_memory): Likewise. * remote-e7000.c (e7000_xfer_inferior_memory): Likewise. * remote-eb.c (eb_xfer_inferior_memory): Likewise. * remote-es.c (es1800_xfer_inferior_memory): Likewise. * remote-mips.c (mips_xfer_memory): Likewise. * remote-mm.c (mm_xfer_inferior_memory): Likewise. * remote-nindy.c (nindy_xfer_inferior_memory): Likewise. * remote-os9k.c (rombug_xfer_inferior_memory): Likewise. * remote-rdi.c (arm_rdi_xfer_memory): Likewise. * remote-rdp.c (remote_rdp_xfer_inferior_memory): Likewise. * remote-sds.c (sds_xfer_memory): Likewise. * remote-sim.c (gdbsim_xfer_inferior_memory): Likewise. * remote-st.c (st2000_xfer_inferior_memory): Likewise. * remote-udi.c (udi_xfer_inferior_memory): Likewise. * remote-vx.c (vx_xfer_memory): Likewise. * remote.c (remote_xfer_memory): Likewise. * target.c (debug_to_xfer_memory, do_xfer_memory): Likewise. * target.h (child_xfer_memory, do_xfer_memory, xfer_memory): Likewise. * target.h (#include "memattr.h"): Added. (target_ops.to_xfer_memory): Add attrib argument. * wince.c (_initialize_inftarg): Removed call to set_dcache_state. * dcache.h (set_dcache_state): Removed declaration. * dcache.c (set_dcache_state): Removed definition * dcache.c: Update module comment, as dcache is now enabled and disabled with memory region attributes instead of by the global variable "remotecache". Add comment describing the interaction between dcache and memory region attributes. (dcache_xfer_memory): Add comment describing benefits of moving cache writeback to a higher level. (dcache_struct): Removed cache_has_stuff field. This was used to record whether the cache had been accessed in order to invalidate it when it was disabled. However, this is not needed because the cache is write through and the code that enables, disables, and deletes memory regions invalidate the cache. Add comment which suggests that we could be more selective and only invalidate those cache lines containing data from those memory regions. (dcache_invalidate): Updated. (dcache_xfer_memory): Updated. (dcache_alloc): Don't abort() if dcache_enabled_p is clear. (dcache_xfer_memory): Removed code that called do_xfer_memory() to perform a uncached transfer if dcache_enabled_p was clear. This function is now only called if caching is enabled for the memory region. (dcache_info): Always print cache info. * target.c (do_xfer_memory): Add attrib argument. (target_xfer_memory, target_xfer_memory_partial): Break transfer into chunks defined by memory regions, pass region attributes to do_xfer_memory(). * dcache.c (dcache_read_line, dcache_write_line): Likewise. * Makefile.in (SFILES): Add memattr.c. (COMMON_OBS): Add memattr.o. (dcache.o): Add target.h to dependencies. * memattr.c: New file. * memattr.h: Likewise.
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static int sds_xfer_memory (CORE_ADDR, char *, int, int,
struct mem_attrib *, struct target_ops *);
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static void sds_prepare_to_store (void);
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static void sds_fetch_registers (int);
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static void sds_resume (ptid_t, int, enum target_signal);
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static int sds_start_remote (PTR);
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static void sds_open (char *, int);
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static void sds_close (int);
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static void sds_store_registers (int);
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static void sds_mourn (void);
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static void sds_create_inferior (char *, char *, char **);
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static void sds_load (char *, int);
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static int getmessage (unsigned char *, int);
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static int putmessage (unsigned char *, int);
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static int sds_send (unsigned char *, int);
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static int readchar (int);
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static ptid_t sds_wait (ptid_t, struct target_waitstatus *);
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static void sds_kill (void);
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static int tohex (int);
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static int fromhex (int);
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static void sds_detach (char *, int);
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static void sds_interrupt (int);
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static void sds_interrupt_twice (int);
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static void interrupt_query (void);
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static int read_frame (char *);
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static int sds_insert_breakpoint (CORE_ADDR, char *);
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static int sds_remove_breakpoint (CORE_ADDR, char *);
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static void init_sds_ops (void);
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static void sds_command (char *args, int from_tty);
/* Define the target operations vector. */
static struct target_ops sds_ops;
/* This was 5 seconds, which is a long time to sit and wait.
Unless this is going though some terminal server or multiplexer or
other form of hairy serial connection, I would think 2 seconds would
be plenty. */
static int sds_timeout = 2;
/* Descriptor for I/O to remote machine. Initialize it to NULL so
that sds_open knows that we don't have a file open when the program
starts. */
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static struct serial *sds_desc = NULL;
/* This limit comes from the monitor. */
#define PBUFSIZ 250
/* Maximum number of bytes to read/write at once. The value here
is chosen to fill up a packet (the headers account for the 32). */
#define MAXBUFBYTES ((PBUFSIZ-32)/2)
static int next_msg_id;
static int just_started;
static int message_pending;
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/* Clean up connection to a remote debugger. */
/* ARGSUSED */
static void
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sds_close (int quitting)
{
if (sds_desc)
serial_close (sds_desc);
sds_desc = NULL;
}
/* Stub for catch_errors. */
static int
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sds_start_remote (PTR dummy)
{
int c;
unsigned char buf[200];
immediate_quit++; /* Allow user to interrupt it */
/* Ack any packet which the remote side has already sent. */
serial_write (sds_desc, "{#*\r\n", 5);
serial_write (sds_desc, "{#}\r\n", 5);
while ((c = readchar (1)) >= 0)
printf_unfiltered ("%c", c);
printf_unfiltered ("\n");
next_msg_id = 251;
buf[0] = 26;
sds_send (buf, 1);
buf[0] = 0;
sds_send (buf, 1);
immediate_quit--;
start_remote (); /* Initialize gdb process mechanisms */
return 1;
}
/* Open a connection to a remote debugger.
NAME is the filename used for communication. */
static void
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sds_open (char *name, int from_tty)
{
if (name == 0)
error ("To open a remote debug connection, you need to specify what serial\n\
device is attached to the remote system (e.g. /dev/ttya).");
target_preopen (from_tty);
unpush_target (&sds_ops);
sds_desc = serial_open (name);
if (!sds_desc)
perror_with_name (name);
if (baud_rate != -1)
{
if (serial_setbaudrate (sds_desc, baud_rate))
{
serial_close (sds_desc);
perror_with_name (name);
}
}
serial_raw (sds_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 (sds_desc);
if (from_tty)
{
puts_filtered ("Remote debugging using ");
puts_filtered (name);
puts_filtered ("\n");
}
push_target (&sds_ops); /* Switch to using remote target now */
just_started = 1;
/* Start the remote connection; if error (0), discard this target.
In particular, if the user quits, be sure to discard it (we'd be
in an inconsistent state otherwise). */
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if (!catch_errors (sds_start_remote, NULL,
"Couldn't establish connection to remote target\n",
RETURN_MASK_ALL))
pop_target ();
}
/* 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
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sds_detach (char *args, int from_tty)
{
char buf[PBUFSIZ];
if (args)
error ("Argument given to \"detach\" when remotely debugging.");
#if 0
/* Tell the remote target to detach. */
strcpy (buf, "D");
sds_send (buf, 1);
#endif
pop_target ();
if (from_tty)
puts_filtered ("Ending remote debugging.\n");
}
/* Convert hex digit A to a number. */
static int
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fromhex (int a)
{
if (a >= '0' && a <= '9')
return a - '0';
else if (a >= 'a' && a <= 'f')
return a - 'a' + 10;
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else
error ("Reply contains invalid hex digit %d", a);
}
/* Convert number NIB to a hex digit. */
static int
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tohex (int nib)
{
if (nib < 10)
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return '0' + nib;
else
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return 'a' + nib - 10;
}
static int
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tob64 (unsigned char *inbuf, char *outbuf, int len)
{
int i, sum;
char *p;
if (len % 3 != 0)
error ("bad length");
p = outbuf;
for (i = 0; i < len; i += 3)
{
/* Collect the next three bytes into a number. */
sum = ((long) *inbuf++) << 16;
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sum |= ((long) *inbuf++) << 8;
sum |= ((long) *inbuf++);
/* Spit out 4 6-bit encodings. */
*p++ = ((sum >> 18) & 0x3f) + '0';
*p++ = ((sum >> 12) & 0x3f) + '0';
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*p++ = ((sum >> 6) & 0x3f) + '0';
*p++ = (sum & 0x3f) + '0';
}
return (p - outbuf);
}
static int
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fromb64 (char *inbuf, char *outbuf, int len)
{
int i, sum;
if (len % 4 != 0)
error ("bad length");
for (i = 0; i < len; i += 4)
{
/* Collect 4 6-bit digits. */
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sum = (*inbuf++ - '0') << 18;
sum |= (*inbuf++ - '0') << 12;
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sum |= (*inbuf++ - '0') << 6;
sum |= (*inbuf++ - '0');
/* Now take the resulting 24-bit number and get three bytes out
of it. */
*outbuf++ = (sum >> 16) & 0xff;
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*outbuf++ = (sum >> 8) & 0xff;
*outbuf++ = sum & 0xff;
}
return (len / 4) * 3;
}
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/* Tell the remote machine to resume. */
static enum target_signal last_sent_signal = TARGET_SIGNAL_0;
int last_sent_step;
static void
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sds_resume (ptid_t ptid, int step, enum target_signal siggnal)
{
unsigned char buf[PBUFSIZ];
last_sent_signal = siggnal;
last_sent_step = step;
buf[0] = (step ? 21 : 20);
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buf[1] = 0; /* (should be signal?) */
sds_send (buf, 2);
}
/* Send a message to target to halt it. Target will respond, and send
us a message pending notice. */
static void
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sds_interrupt (int signo)
{
unsigned char buf[PBUFSIZ];
/* If this doesn't work, try more severe steps. */
signal (signo, sds_interrupt_twice);
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if (remote_debug)
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fprintf_unfiltered (gdb_stdlog, "sds_interrupt called\n");
buf[0] = 25;
sds_send (buf, 1);
}
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static void (*ofunc) ();
/* The user typed ^C twice. */
static void
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sds_interrupt_twice (int signo)
{
signal (signo, ofunc);
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interrupt_query ();
signal (signo, sds_interrupt);
}
/* Ask the user what to do when an interrupt is received. */
static void
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interrupt_query (void)
{
target_terminal_ours ();
if (query ("Interrupted while waiting for the program.\n\
Give up (and stop debugging it)? "))
{
target_mourn_inferior ();
throw_exception (RETURN_QUIT);
}
target_terminal_inferior ();
}
/* If nonzero, ignore the next kill. */
int kill_kludge;
/* Wait until the remote machine stops, then return, storing status in
STATUS just as `wait' would. Returns "pid" (though it's not clear
what, if anything, that means in the case of this target). */
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static ptid_t
sds_wait (ptid_t ptid, struct target_waitstatus *status)
{
unsigned char buf[PBUFSIZ];
int retlen;
status->kind = TARGET_WAITKIND_EXITED;
status->value.integer = 0;
ofunc = (void (*)()) signal (SIGINT, sds_interrupt);
signal (SIGINT, ofunc);
if (just_started)
{
just_started = 0;
status->kind = TARGET_WAITKIND_STOPPED;
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return inferior_ptid;
}
while (1)
{
getmessage (buf, 1);
if (message_pending)
{
buf[0] = 26;
retlen = sds_send (buf, 1);
if (remote_debug)
{
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fprintf_unfiltered (gdb_stdlog, "Signals: %02x%02x %02x %02x\n",
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buf[0], buf[1],
buf[2], buf[3]);
}
message_pending = 0;
status->kind = TARGET_WAITKIND_STOPPED;
status->value.sig = TARGET_SIGNAL_TRAP;
goto got_status;
}
}
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got_status:
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return inferior_ptid;
}
static unsigned char sprs[16];
/* Read the remote registers into the block REGS. */
/* Currently we just read all the registers, so we don't use regno. */
/* ARGSUSED */
static void
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sds_fetch_registers (int regno)
{
unsigned char buf[PBUFSIZ];
int i, retlen;
char regs[REGISTER_BYTES];
/* Unimplemented registers read as all bits zero. */
memset (regs, 0, REGISTER_BYTES);
buf[0] = 18;
buf[1] = 1;
buf[2] = 0;
retlen = sds_send (buf, 3);
for (i = 0; i < 4 * 6; ++i)
regs[i + 4 * 32 + 8 * 32] = buf[i];
for (i = 0; i < 4 * 4; ++i)
sprs[i] = buf[i + 4 * 7];
buf[0] = 18;
buf[1] = 2;
buf[2] = 0;
retlen = sds_send (buf, 3);
for (i = 0; i < retlen; i++)
regs[i] = buf[i];
/* (should warn about reply too short) */
for (i = 0; i < NUM_REGS; i++)
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supply_register (i, &regs[REGISTER_BYTE (i)]);
}
/* Prepare to store registers. Since we may send them all, we have to
read out the ones we don't want to change first. */
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static void
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sds_prepare_to_store (void)
{
/* Make sure the entire registers array is valid. */
deprecated_read_register_bytes (0, (char *) NULL, REGISTER_BYTES);
}
/* Store register REGNO, or all registers if REGNO == -1, from the contents
of REGISTERS. FIXME: ignores errors. */
static void
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sds_store_registers (int regno)
{
unsigned char *p, buf[PBUFSIZ];
int i;
/* Store all the special-purpose registers. */
p = buf;
*p++ = 19;
*p++ = 1;
*p++ = 0;
*p++ = 0;
for (i = 0; i < 4 * 6; i++)
*p++ = deprecated_registers[i + 4 * 32 + 8 * 32];
for (i = 0; i < 4 * 1; i++)
*p++ = 0;
for (i = 0; i < 4 * 4; i++)
*p++ = sprs[i];
sds_send (buf, p - buf);
/* Store all the general-purpose registers. */
p = buf;
*p++ = 19;
*p++ = 2;
*p++ = 0;
*p++ = 0;
for (i = 0; i < 4 * 32; i++)
*p++ = deprecated_registers[i];
sds_send (buf, p - buf);
}
/* 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 for error. */
static int
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sds_write_bytes (CORE_ADDR memaddr, char *myaddr, int len)
{
int max_buf_size; /* Max size of packet output buffer */
int origlen;
unsigned char buf[PBUFSIZ];
int todo;
int i;
/* Chop the transfer down if necessary */
max_buf_size = 150;
origlen = len;
while (len > 0)
{
todo = min (len, max_buf_size);
buf[0] = 13;
buf[1] = 0;
buf[2] = (int) (memaddr >> 24) & 0xff;
buf[3] = (int) (memaddr >> 16) & 0xff;
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buf[4] = (int) (memaddr >> 8) & 0xff;
buf[5] = (int) (memaddr) & 0xff;
buf[6] = 1;
buf[7] = 0;
for (i = 0; i < todo; i++)
buf[i + 8] = myaddr[i];
sds_send (buf, 8 + todo);
/* (should look at result) */
myaddr += todo;
memaddr += todo;
len -= todo;
}
return origlen;
}
/* 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
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sds_read_bytes (CORE_ADDR memaddr, char *myaddr, int len)
{
int max_buf_size; /* Max size of packet output buffer */
int origlen, retlen;
unsigned char buf[PBUFSIZ];
int todo;
int i;
/* Chop the transfer down if necessary */
max_buf_size = 150;
origlen = len;
while (len > 0)
{
todo = min (len, max_buf_size);
buf[0] = 12;
buf[1] = 0;
buf[2] = (int) (memaddr >> 24) & 0xff;
buf[3] = (int) (memaddr >> 16) & 0xff;
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buf[4] = (int) (memaddr >> 8) & 0xff;
buf[5] = (int) (memaddr) & 0xff;
buf[6] = (int) (todo >> 8) & 0xff;
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buf[7] = (int) (todo) & 0xff;
buf[8] = 1;
retlen = sds_send (buf, 9);
if (retlen - 2 != todo)
{
return 0;
}
/* Reply describes memory byte by byte. */
for (i = 0; i < todo; i++)
myaddr[i] = buf[i + 2];
myaddr += todo;
memaddr += todo;
len -= todo;
}
return origlen;
}
/* Read or write LEN bytes from inferior memory at MEMADDR,
transferring to or from debugger address MYADDR. Write to inferior
if SHOULD_WRITE is nonzero. Returns length of data written or
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read; 0 for error. TARGET is unused. */
/* ARGSUSED */
static int
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sds_xfer_memory (CORE_ADDR memaddr, char *myaddr, int len, int should_write,
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struct mem_attrib *attrib, struct target_ops *target)
{
* TODO: Note abstraction layer violation where "ocd reset" command must invalidate the dcache, and how this might be fixed. * monitor.c (#include "dcache.h"): Removed. (remote_dcache): Removed. (monitor_open): Removed code that created local dcache. (flush_monitor_dcache): Removed (unused function). (monitor_resume): Removed call to dcache_invd(). (monitor_load): Likewise. (monitor_xfer_memory): Changed to call monitor_write_memory(), monitor_write_memory_block(), and monitor_read_memory() instead of dcache_xfer_memory(). * monitor.h (flush_monitor_dcache): Removed (unused function). * ocd.c (#include "dcache.h"): Removed. (ocd_dcache): Removed. (ocd_open): Removed code that created local dcache. (ocd_resume): Removed call to dcache_invd(). (ocd_xfer_memory): Changed to call ocd_write_bytes() and ocd_read_bytes() instead of dcache_xfer_memory(). (bdm_reset_command): Invalidate target dcache. * remote-bug.c (bug_load): Remove call to dcache_invd(). (bug_resume): Likewise. (bug_settings): Remove dcache, readfunc, and writefunc fields from initializer. (bug_xfer_memory): Changed to call bug_read_memory() and bug_write_memory() instead of dcache_xfer_memory(). * remote-nindy.c (#include "dcache.h"): Removed. (nindy_dcache): Removed. (nindy_open): Removed code that created local dcache. (nindy_resume): Removed call to dcache_invd(). (nindy_load): Likewise. (nindy_xfer_inferior_memory): Changed to call ninMemPut() and ninMemGet() instead of dcache_xfer_memory(). * remote-sds.c (#include "dcache.h"): Removed. (sds_dcache): Removed. (sds_open): Removed code that created local dcache. (sds_resume): Removed call to dcache_invd(). (sds_xfer_memory): Changed to call sds_write_bytes() and sds_read_bytes() instead of dcache_xfer_memory(). * remote-utils.c (gr_open): Removed code that created local dcache. * remote-utils.h (#include "dcache.h"): Removed. (struct gr_settings): Removed dcache, readfunc, and writefunc fields. (gr_get_dcache, gr_set_dcache): Removed macro definitions. * remote.c (#include "dcache.h"): Removed. (remote_dcache): Removed. (remote_open_1): Removed code that created local dcache. (remote_async_open_1): Likewise. (remote_resume): Removed call to dcache_invd(). (remote_async_resume): Likewise. (remote_xfer_memory): Changed to call remote_write_bytes() and remote_read_bytes() instead of dcache_xfer_memory(). * wince.c (#include "dcache.h"): Removed. (remote_dcache): Removed. (child_create_inferior): Removed code that created local dcache. (child_xfer_memory): Changed to call remote_write_bytes() and remote_read_bytes() instead of dcache_xfer_memory(). (child_resume): Removed call to dcache_invd(). * target.c (target_dcache): Added. (target_load): Invalidate target_dcache. (do_xfer_memory): New function. (target_xfer_memory): Reimplement in terms of dcache_xfer_memory(). (target_xfer_memory_partial): Likewise. (initialize_targets): Create target_dcache. * target.h (#include "dcache.h"): Added. (target_open): Invalidate target_dcache. (target_resume): Likewise. (do_xfer_memory): New declaration. * dcache.c (dcache_init): Removed reading and writing arguments. (dcache_struct): Removed read_memory and write_memory fields. (dcache_write_line): Call do_xfer_memory. (dcache_read_line): Likewise. (dcache_xfer_memory): Likewise. (dcache_invalidate): Renamed from dcache_invd. (dcache_init): Updated. (dcache_xfer_memory): Updated. * dcache.h (memxferfunc): Removed definition.
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int res;
if (should_write)
res = sds_write_bytes (memaddr, myaddr, len);
else
res = sds_read_bytes (memaddr, myaddr, len);
return res;
}
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static void
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sds_files_info (struct target_ops *ignore)
{
puts_filtered ("Debugging over a serial connection, using SDS protocol.\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, masking it down to 7 bits. */
static int
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readchar (int timeout)
{
int ch;
ch = serial_readchar (sds_desc, timeout);
if (remote_debug > 1 && ch >= 0)
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fprintf_unfiltered (gdb_stdlog, "%c(%x)", ch, ch);
switch (ch)
{
case SERIAL_EOF:
error ("Remote connection closed");
case SERIAL_ERROR:
perror_with_name ("Remote communication error");
case SERIAL_TIMEOUT:
return ch;
default:
return ch & 0x7f;
}
}
/* An SDS-style checksum is a sum of the bytes modulo 253. (Presumably
because 253, 254, and 255 are special flags in the protocol.) */
static int
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compute_checksum (int csum, char *buf, int len)
{
int i;
for (i = 0; i < len; ++i)
csum += (unsigned char) buf[i];
csum %= 253;
return csum;
}
/* Send the command in BUF to the remote machine, and read the reply
into BUF also. */
static int
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sds_send (unsigned char *buf, int len)
{
putmessage (buf, len);
return getmessage (buf, 0);
}
/* Send a message to the remote machine. */
static int
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putmessage (unsigned char *buf, int len)
{
int i, enclen;
unsigned char csum = 0;
char buf2[PBUFSIZ], buf3[PBUFSIZ];
unsigned char header[3];
char *p;
/* Copy the packet into buffer BUF2, encapsulating it
and giving it a checksum. */
if (len > 170) /* Prosanity check */
internal_error (__FILE__, __LINE__, "failed internal consistency check");
if (remote_debug)
{
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fprintf_unfiltered (gdb_stdlog, "Message to send: \"");
for (i = 0; i < len; ++i)
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fprintf_unfiltered (gdb_stdlog, "%02x", buf[i]);
fprintf_unfiltered (gdb_stdlog, "\"\n");
}
p = buf2;
*p++ = '$';
if (len % 3 != 0)
{
buf[len] = '\0';
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buf[len + 1] = '\0';
}
header[1] = next_msg_id;
header[2] = len;
csum = compute_checksum (csum, buf, len);
csum = compute_checksum (csum, header + 1, 2);
header[0] = csum;
tob64 (header, p, 3);
p += 4;
enclen = tob64 (buf, buf3, ((len + 2) / 3) * 3);
for (i = 0; i < enclen; ++i)
*p++ = buf3[i];
*p++ = '\r';
*p++ = '\n';
next_msg_id = (next_msg_id + 3) % 245;
/* Send it over and over until we get a positive ack. */
while (1)
{
if (remote_debug)
{
*p = '\0';
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fprintf_unfiltered (gdb_stdlog, "Sending encoded: \"%s\"", buf2);
fprintf_unfiltered (gdb_stdlog,
" (Checksum %d, id %d, length %d)\n",
header[0], header[1], header[2]);
gdb_flush (gdb_stdlog);
}
if (serial_write (sds_desc, buf2, p - buf2))
perror_with_name ("putmessage: write failed");
return 1;
}
}
/* Come here after finding the start of the frame. Collect the rest
into BUF. Returns 0 on any error, 1 on success. */
static int
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read_frame (char *buf)
{
char *bp;
int c;
bp = buf;
while (1)
{
c = readchar (sds_timeout);
switch (c)
{
case SERIAL_TIMEOUT:
if (remote_debug)
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fputs_filtered ("Timeout in mid-message, retrying\n", gdb_stdlog);
return 0;
case '$':
if (remote_debug)
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fputs_filtered ("Saw new packet start in middle of old one\n",
gdb_stdlog);
return 0; /* Start a new packet, count retries */
case '\r':
break;
case '\n':
{
*bp = '\000';
if (remote_debug)
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fprintf_unfiltered (gdb_stdlog, "Received encoded: \"%s\"\n",
buf);
return 1;
}
default:
if (bp < buf + PBUFSIZ - 1)
{
*bp++ = c;
continue;
}
*bp = '\0';
puts_filtered ("Message too long: ");
puts_filtered (buf);
puts_filtered ("\n");
return 0;
}
}
}
/* Read a packet from the remote machine, with error checking,
and store it in BUF. BUF is expected to be of size PBUFSIZ.
If FOREVER, wait forever rather than timing out; this is used
while the target is executing user code. */
static int
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getmessage (unsigned char *buf, int forever)
{
int c, c2, c3;
int tries;
int timeout;
int val, i, len, csum;
unsigned char header[3];
unsigned char inbuf[500];
strcpy (buf, "timeout");
if (forever)
{
timeout = watchdog > 0 ? watchdog : -1;
}
else
timeout = sds_timeout;
#define MAX_TRIES 3
for (tries = 1; tries <= MAX_TRIES; tries++)
{
/* This can loop forever if the remote side sends us characters
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continuously, but if it pauses, we'll get a zero from readchar
because of timeout. Then we'll count that as a retry. */
/* Note that we will only wait forever prior to the start of a packet.
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After that, we expect characters to arrive at a brisk pace. They
should show up within sds_timeout intervals. */
do
{
c = readchar (timeout);
if (c == SERIAL_TIMEOUT)
{
if (forever) /* Watchdog went off. Kill the target. */
{
target_mourn_inferior ();
error ("Watchdog has expired. Target detached.\n");
}
if (remote_debug)
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fputs_filtered ("Timed out.\n", gdb_stdlog);
goto retry;
}
}
while (c != '$' && c != '{');
/* We might have seen a "trigraph", a sequence of three characters
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that indicate various sorts of communication state. */
if (c == '{')
{
/* Read the other two chars of the trigraph. */
c2 = readchar (timeout);
c3 = readchar (timeout);
if (remote_debug)
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fprintf_unfiltered (gdb_stdlog, "Trigraph %c%c%c received\n",
c, c2, c3);
if (c3 == '+')
{
message_pending = 1;
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return 0; /*???? */
}
continue;
}
val = read_frame (inbuf);
if (val == 1)
{
fromb64 (inbuf, header, 4);
/* (should check out other bits) */
fromb64 (inbuf + 4, buf, strlen (inbuf) - 4);
len = header[2];
csum = 0;
csum = compute_checksum (csum, buf, len);
csum = compute_checksum (csum, header + 1, 2);
if (csum != header[0])
fprintf_unfiltered (gdb_stderr,
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"Checksum mismatch: computed %d, received %d\n",
csum, header[0]);
if (header[2] == 0xff)
fprintf_unfiltered (gdb_stderr, "Requesting resend...\n");
if (remote_debug)
{
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fprintf_unfiltered (gdb_stdlog,
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"... (Got checksum %d, id %d, length %d)\n",
header[0], header[1], header[2]);
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fprintf_unfiltered (gdb_stdlog, "Message received: \"");
for (i = 0; i < len; ++i)
{
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fprintf_unfiltered (gdb_stdlog, "%02x", (unsigned char) buf[i]);
}
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fprintf_unfiltered (gdb_stdlog, "\"\n");
}
/* no ack required? */
return len;
}
/* Try the whole thing again. */
retry:
/* need to do something here */
;
}
/* We have tried hard enough, and just can't receive the packet. Give up. */
printf_unfiltered ("Ignoring packet error, continuing...\n");
return 0;
}
static void
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sds_kill (void)
{
/* Don't try to do anything to the target. */
}
static void
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sds_mourn (void)
{
unpush_target (&sds_ops);
generic_mourn_inferior ();
}
static void
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sds_create_inferior (char *exec_file, char *args, char **env)
{
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inferior_ptid = pid_to_ptid (42000);
/* Clean up from the last time we were running. */
clear_proceed_status ();
/* Let the remote process run. */
proceed (bfd_get_start_address (exec_bfd), TARGET_SIGNAL_0, 0);
}
static void
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sds_load (char *filename, int from_tty)
{
generic_load (filename, from_tty);
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inferior_ptid = null_ptid;
}
/* The SDS monitor has commands for breakpoint insertion, although it
it doesn't actually manage the breakpoints, it just returns the
replaced instruction back to the debugger. */
static int
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sds_insert_breakpoint (CORE_ADDR addr, char *contents_cache)
{
int i, retlen;
unsigned char *p, buf[PBUFSIZ];
p = buf;
*p++ = 16;
*p++ = 0;
*p++ = (int) (addr >> 24) & 0xff;
*p++ = (int) (addr >> 16) & 0xff;
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*p++ = (int) (addr >> 8) & 0xff;
*p++ = (int) (addr) & 0xff;
retlen = sds_send (buf, p - buf);
for (i = 0; i < 4; ++i)
contents_cache[i] = buf[i + 2];
return 0;
}
static int
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sds_remove_breakpoint (CORE_ADDR addr, char *contents_cache)
{
int i, retlen;
unsigned char *p, buf[PBUFSIZ];
p = buf;
*p++ = 17;
*p++ = 0;
*p++ = (int) (addr >> 24) & 0xff;
*p++ = (int) (addr >> 16) & 0xff;
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*p++ = (int) (addr >> 8) & 0xff;
*p++ = (int) (addr) & 0xff;
for (i = 0; i < 4; ++i)
*p++ = contents_cache[i];
retlen = sds_send (buf, p - buf);
return 0;
}
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static void
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init_sds_ops (void)
{
sds_ops.to_shortname = "sds";
sds_ops.to_longname = "Remote serial target with SDS protocol";
sds_ops.to_doc = "Use a remote computer via a serial line; using the SDS protocol.\n\
Specify the serial device it is connected to (e.g. /dev/ttya).";
sds_ops.to_open = sds_open;
sds_ops.to_close = sds_close;
sds_ops.to_detach = sds_detach;
sds_ops.to_resume = sds_resume;
sds_ops.to_wait = sds_wait;
sds_ops.to_fetch_registers = sds_fetch_registers;
sds_ops.to_store_registers = sds_store_registers;
sds_ops.to_prepare_to_store = sds_prepare_to_store;
sds_ops.to_xfer_memory = sds_xfer_memory;
sds_ops.to_files_info = sds_files_info;
sds_ops.to_insert_breakpoint = sds_insert_breakpoint;
sds_ops.to_remove_breakpoint = sds_remove_breakpoint;
sds_ops.to_kill = sds_kill;
sds_ops.to_load = sds_load;
sds_ops.to_create_inferior = sds_create_inferior;
sds_ops.to_mourn_inferior = sds_mourn;
sds_ops.to_stratum = process_stratum;
sds_ops.to_has_all_memory = 1;
sds_ops.to_has_memory = 1;
sds_ops.to_has_stack = 1;
sds_ops.to_has_registers = 1;
sds_ops.to_has_execution = 1;
sds_ops.to_magic = OPS_MAGIC;
}
/* Put a command string, in args, out to the monitor and display the
reply message. */
static void
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sds_command (char *args, int from_tty)
{
char *p;
int i, len, retlen;
unsigned char buf[1000];
/* Convert hexadecimal chars into a byte buffer. */
p = args;
len = 0;
while (*p != '\0')
{
buf[len++] = fromhex (p[0]) * 16 + fromhex (p[1]);
if (p[1] == '\0')
break;
p += 2;
}
retlen = sds_send (buf, len);
printf_filtered ("Reply is ");
for (i = 0; i < retlen; ++i)
{
printf_filtered ("%02x", buf[i]);
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}
printf_filtered ("\n");
}
void
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_initialize_remote_sds (void)
{
init_sds_ops ();
add_target (&sds_ops);
add_show_from_set (add_set_cmd ("sdstimeout", no_class,
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var_integer, (char *) &sds_timeout,
"Set timeout value for sds read.\n", &setlist),
&showlist);
add_com ("sds", class_obscure, sds_command,
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"Send a command to the SDS monitor.");
}