899 lines
25 KiB
C
899 lines
25 KiB
C
/* IBM RS/6000 native-dependent code for GDB, the GNU debugger.
|
||
|
||
Copyright (C) 1986-2013 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/>. */
|
||
|
||
#include "defs.h"
|
||
#include "inferior.h"
|
||
#include "target.h"
|
||
#include "gdbcore.h"
|
||
#include "symfile.h"
|
||
#include "objfiles.h"
|
||
#include "libbfd.h" /* For bfd_default_set_arch_mach (FIXME) */
|
||
#include "bfd.h"
|
||
#include "exceptions.h"
|
||
#include "gdb-stabs.h"
|
||
#include "regcache.h"
|
||
#include "arch-utils.h"
|
||
#include "inf-child.h"
|
||
#include "inf-ptrace.h"
|
||
#include "ppc-tdep.h"
|
||
#include "rs6000-tdep.h"
|
||
#include "exec.h"
|
||
#include "observer.h"
|
||
#include "xcoffread.h"
|
||
|
||
#include <sys/ptrace.h>
|
||
#include <sys/reg.h>
|
||
|
||
#include <sys/param.h>
|
||
#include <sys/dir.h>
|
||
#include <sys/user.h>
|
||
#include <signal.h>
|
||
#include <sys/ioctl.h>
|
||
#include <fcntl.h>
|
||
#include <errno.h>
|
||
|
||
#include <a.out.h>
|
||
#include <sys/file.h>
|
||
#include "gdb_stat.h"
|
||
#include "gdb_bfd.h"
|
||
#include <sys/core.h>
|
||
#define __LDINFO_PTRACE32__ /* for __ld_info32 */
|
||
#define __LDINFO_PTRACE64__ /* for __ld_info64 */
|
||
#include <sys/ldr.h>
|
||
#include <sys/systemcfg.h>
|
||
#include "xml-utils.h"
|
||
|
||
/* On AIX4.3+, sys/ldr.h provides different versions of struct ld_info for
|
||
debugging 32-bit and 64-bit processes. Define a typedef and macros for
|
||
accessing fields in the appropriate structures. */
|
||
|
||
/* In 32-bit compilation mode (which is the only mode from which ptrace()
|
||
works on 4.3), __ld_info32 is #defined as equivalent to ld_info. */
|
||
|
||
#ifdef __ld_info32
|
||
# define ARCH3264
|
||
#endif
|
||
|
||
/* Return whether the current architecture is 64-bit. */
|
||
|
||
#ifndef ARCH3264
|
||
# define ARCH64() 0
|
||
#else
|
||
# define ARCH64() (register_size (target_gdbarch (), 0) == 8)
|
||
#endif
|
||
|
||
/* Union of 32-bit and 64-bit versions of ld_info. */
|
||
|
||
typedef union {
|
||
#ifndef ARCH3264
|
||
struct ld_info l32;
|
||
struct ld_info l64;
|
||
#else
|
||
struct __ld_info32 l32;
|
||
struct __ld_info64 l64;
|
||
#endif
|
||
} LdInfo;
|
||
|
||
/* If compiling with 32-bit and 64-bit debugging capability (e.g. AIX 4.x),
|
||
declare and initialize a variable named VAR suitable for use as the arch64
|
||
parameter to the various LDI_*() macros. */
|
||
|
||
#ifndef ARCH3264
|
||
# define ARCH64_DECL(var)
|
||
#else
|
||
# define ARCH64_DECL(var) int var = ARCH64 ()
|
||
#endif
|
||
|
||
/* Return LDI's FIELD for a 64-bit process if ARCH64 and for a 32-bit process
|
||
otherwise. This technique only works for FIELDs with the same data type in
|
||
32-bit and 64-bit versions of ld_info. */
|
||
|
||
#ifndef ARCH3264
|
||
# define LDI_FIELD(ldi, arch64, field) (ldi)->l32.ldinfo_##field
|
||
#else
|
||
# define LDI_FIELD(ldi, arch64, field) \
|
||
(arch64 ? (ldi)->l64.ldinfo_##field : (ldi)->l32.ldinfo_##field)
|
||
#endif
|
||
|
||
/* Return various LDI fields for a 64-bit process if ARCH64 and for a 32-bit
|
||
process otherwise. */
|
||
|
||
#define LDI_NEXT(ldi, arch64) LDI_FIELD(ldi, arch64, next)
|
||
#define LDI_FD(ldi, arch64) LDI_FIELD(ldi, arch64, fd)
|
||
#define LDI_FILENAME(ldi, arch64) LDI_FIELD(ldi, arch64, filename)
|
||
|
||
static void exec_one_dummy_insn (struct regcache *);
|
||
|
||
static LONGEST rs6000_xfer_shared_libraries
|
||
(struct target_ops *ops, enum target_object object,
|
||
const char *annex, gdb_byte *readbuf, const gdb_byte *writebuf,
|
||
ULONGEST offset, LONGEST len);
|
||
|
||
/* Given REGNO, a gdb register number, return the corresponding
|
||
number suitable for use as a ptrace() parameter. Return -1 if
|
||
there's no suitable mapping. Also, set the int pointed to by
|
||
ISFLOAT to indicate whether REGNO is a floating point register. */
|
||
|
||
static int
|
||
regmap (struct gdbarch *gdbarch, int regno, int *isfloat)
|
||
{
|
||
struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
|
||
|
||
*isfloat = 0;
|
||
if (tdep->ppc_gp0_regnum <= regno
|
||
&& regno < tdep->ppc_gp0_regnum + ppc_num_gprs)
|
||
return regno;
|
||
else if (tdep->ppc_fp0_regnum >= 0
|
||
&& tdep->ppc_fp0_regnum <= regno
|
||
&& regno < tdep->ppc_fp0_regnum + ppc_num_fprs)
|
||
{
|
||
*isfloat = 1;
|
||
return regno - tdep->ppc_fp0_regnum + FPR0;
|
||
}
|
||
else if (regno == gdbarch_pc_regnum (gdbarch))
|
||
return IAR;
|
||
else if (regno == tdep->ppc_ps_regnum)
|
||
return MSR;
|
||
else if (regno == tdep->ppc_cr_regnum)
|
||
return CR;
|
||
else if (regno == tdep->ppc_lr_regnum)
|
||
return LR;
|
||
else if (regno == tdep->ppc_ctr_regnum)
|
||
return CTR;
|
||
else if (regno == tdep->ppc_xer_regnum)
|
||
return XER;
|
||
else if (tdep->ppc_fpscr_regnum >= 0
|
||
&& regno == tdep->ppc_fpscr_regnum)
|
||
return FPSCR;
|
||
else if (tdep->ppc_mq_regnum >= 0 && regno == tdep->ppc_mq_regnum)
|
||
return MQ;
|
||
else
|
||
return -1;
|
||
}
|
||
|
||
/* Call ptrace(REQ, ID, ADDR, DATA, BUF). */
|
||
|
||
static int
|
||
rs6000_ptrace32 (int req, int id, int *addr, int data, int *buf)
|
||
{
|
||
int ret = ptrace (req, id, (int *)addr, data, buf);
|
||
#if 0
|
||
printf ("rs6000_ptrace32 (%d, %d, 0x%x, %08x, 0x%x) = 0x%x\n",
|
||
req, id, (unsigned int)addr, data, (unsigned int)buf, ret);
|
||
#endif
|
||
return ret;
|
||
}
|
||
|
||
/* Call ptracex(REQ, ID, ADDR, DATA, BUF). */
|
||
|
||
static int
|
||
rs6000_ptrace64 (int req, int id, long long addr, int data, void *buf)
|
||
{
|
||
#ifdef ARCH3264
|
||
int ret = ptracex (req, id, addr, data, buf);
|
||
#else
|
||
int ret = 0;
|
||
#endif
|
||
#if 0
|
||
printf ("rs6000_ptrace64 (%d, %d, %s, %08x, 0x%x) = 0x%x\n",
|
||
req, id, hex_string (addr), data, (unsigned int)buf, ret);
|
||
#endif
|
||
return ret;
|
||
}
|
||
|
||
/* Fetch register REGNO from the inferior. */
|
||
|
||
static void
|
||
fetch_register (struct regcache *regcache, int regno)
|
||
{
|
||
struct gdbarch *gdbarch = get_regcache_arch (regcache);
|
||
int addr[MAX_REGISTER_SIZE];
|
||
int nr, isfloat;
|
||
|
||
/* Retrieved values may be -1, so infer errors from errno. */
|
||
errno = 0;
|
||
|
||
nr = regmap (gdbarch, regno, &isfloat);
|
||
|
||
/* Floating-point registers. */
|
||
if (isfloat)
|
||
rs6000_ptrace32 (PT_READ_FPR, PIDGET (inferior_ptid), addr, nr, 0);
|
||
|
||
/* Bogus register number. */
|
||
else if (nr < 0)
|
||
{
|
||
if (regno >= gdbarch_num_regs (gdbarch))
|
||
fprintf_unfiltered (gdb_stderr,
|
||
"gdb error: register no %d not implemented.\n",
|
||
regno);
|
||
return;
|
||
}
|
||
|
||
/* Fixed-point registers. */
|
||
else
|
||
{
|
||
if (!ARCH64 ())
|
||
*addr = rs6000_ptrace32 (PT_READ_GPR, PIDGET (inferior_ptid),
|
||
(int *) nr, 0, 0);
|
||
else
|
||
{
|
||
/* PT_READ_GPR requires the buffer parameter to point to long long,
|
||
even if the register is really only 32 bits. */
|
||
long long buf;
|
||
rs6000_ptrace64 (PT_READ_GPR, PIDGET (inferior_ptid), nr, 0, &buf);
|
||
if (register_size (gdbarch, regno) == 8)
|
||
memcpy (addr, &buf, 8);
|
||
else
|
||
*addr = buf;
|
||
}
|
||
}
|
||
|
||
if (!errno)
|
||
regcache_raw_supply (regcache, regno, (char *) addr);
|
||
else
|
||
{
|
||
#if 0
|
||
/* FIXME: this happens 3 times at the start of each 64-bit program. */
|
||
perror (_("ptrace read"));
|
||
#endif
|
||
errno = 0;
|
||
}
|
||
}
|
||
|
||
/* Store register REGNO back into the inferior. */
|
||
|
||
static void
|
||
store_register (struct regcache *regcache, int regno)
|
||
{
|
||
struct gdbarch *gdbarch = get_regcache_arch (regcache);
|
||
int addr[MAX_REGISTER_SIZE];
|
||
int nr, isfloat;
|
||
|
||
/* Fetch the register's value from the register cache. */
|
||
regcache_raw_collect (regcache, regno, addr);
|
||
|
||
/* -1 can be a successful return value, so infer errors from errno. */
|
||
errno = 0;
|
||
|
||
nr = regmap (gdbarch, regno, &isfloat);
|
||
|
||
/* Floating-point registers. */
|
||
if (isfloat)
|
||
rs6000_ptrace32 (PT_WRITE_FPR, PIDGET (inferior_ptid), addr, nr, 0);
|
||
|
||
/* Bogus register number. */
|
||
else if (nr < 0)
|
||
{
|
||
if (regno >= gdbarch_num_regs (gdbarch))
|
||
fprintf_unfiltered (gdb_stderr,
|
||
"gdb error: register no %d not implemented.\n",
|
||
regno);
|
||
}
|
||
|
||
/* Fixed-point registers. */
|
||
else
|
||
{
|
||
if (regno == gdbarch_sp_regnum (gdbarch))
|
||
/* Execute one dummy instruction (which is a breakpoint) in inferior
|
||
process to give kernel a chance to do internal housekeeping.
|
||
Otherwise the following ptrace(2) calls will mess up user stack
|
||
since kernel will get confused about the bottom of the stack
|
||
(%sp). */
|
||
exec_one_dummy_insn (regcache);
|
||
|
||
/* The PT_WRITE_GPR operation is rather odd. For 32-bit inferiors,
|
||
the register's value is passed by value, but for 64-bit inferiors,
|
||
the address of a buffer containing the value is passed. */
|
||
if (!ARCH64 ())
|
||
rs6000_ptrace32 (PT_WRITE_GPR, PIDGET (inferior_ptid),
|
||
(int *) nr, *addr, 0);
|
||
else
|
||
{
|
||
/* PT_WRITE_GPR requires the buffer parameter to point to an 8-byte
|
||
area, even if the register is really only 32 bits. */
|
||
long long buf;
|
||
if (register_size (gdbarch, regno) == 8)
|
||
memcpy (&buf, addr, 8);
|
||
else
|
||
buf = *addr;
|
||
rs6000_ptrace64 (PT_WRITE_GPR, PIDGET (inferior_ptid), nr, 0, &buf);
|
||
}
|
||
}
|
||
|
||
if (errno)
|
||
{
|
||
perror (_("ptrace write"));
|
||
errno = 0;
|
||
}
|
||
}
|
||
|
||
/* Read from the inferior all registers if REGNO == -1 and just register
|
||
REGNO otherwise. */
|
||
|
||
static void
|
||
rs6000_fetch_inferior_registers (struct target_ops *ops,
|
||
struct regcache *regcache, int regno)
|
||
{
|
||
struct gdbarch *gdbarch = get_regcache_arch (regcache);
|
||
if (regno != -1)
|
||
fetch_register (regcache, regno);
|
||
|
||
else
|
||
{
|
||
struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
|
||
|
||
/* Read 32 general purpose registers. */
|
||
for (regno = tdep->ppc_gp0_regnum;
|
||
regno < tdep->ppc_gp0_regnum + ppc_num_gprs;
|
||
regno++)
|
||
{
|
||
fetch_register (regcache, regno);
|
||
}
|
||
|
||
/* Read general purpose floating point registers. */
|
||
if (tdep->ppc_fp0_regnum >= 0)
|
||
for (regno = 0; regno < ppc_num_fprs; regno++)
|
||
fetch_register (regcache, tdep->ppc_fp0_regnum + regno);
|
||
|
||
/* Read special registers. */
|
||
fetch_register (regcache, gdbarch_pc_regnum (gdbarch));
|
||
fetch_register (regcache, tdep->ppc_ps_regnum);
|
||
fetch_register (regcache, tdep->ppc_cr_regnum);
|
||
fetch_register (regcache, tdep->ppc_lr_regnum);
|
||
fetch_register (regcache, tdep->ppc_ctr_regnum);
|
||
fetch_register (regcache, tdep->ppc_xer_regnum);
|
||
if (tdep->ppc_fpscr_regnum >= 0)
|
||
fetch_register (regcache, tdep->ppc_fpscr_regnum);
|
||
if (tdep->ppc_mq_regnum >= 0)
|
||
fetch_register (regcache, tdep->ppc_mq_regnum);
|
||
}
|
||
}
|
||
|
||
/* Store our register values back into the inferior.
|
||
If REGNO is -1, do this for all registers.
|
||
Otherwise, REGNO specifies which register (so we can save time). */
|
||
|
||
static void
|
||
rs6000_store_inferior_registers (struct target_ops *ops,
|
||
struct regcache *regcache, int regno)
|
||
{
|
||
struct gdbarch *gdbarch = get_regcache_arch (regcache);
|
||
if (regno != -1)
|
||
store_register (regcache, regno);
|
||
|
||
else
|
||
{
|
||
struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
|
||
|
||
/* Write general purpose registers first. */
|
||
for (regno = tdep->ppc_gp0_regnum;
|
||
regno < tdep->ppc_gp0_regnum + ppc_num_gprs;
|
||
regno++)
|
||
{
|
||
store_register (regcache, regno);
|
||
}
|
||
|
||
/* Write floating point registers. */
|
||
if (tdep->ppc_fp0_regnum >= 0)
|
||
for (regno = 0; regno < ppc_num_fprs; regno++)
|
||
store_register (regcache, tdep->ppc_fp0_regnum + regno);
|
||
|
||
/* Write special registers. */
|
||
store_register (regcache, gdbarch_pc_regnum (gdbarch));
|
||
store_register (regcache, tdep->ppc_ps_regnum);
|
||
store_register (regcache, tdep->ppc_cr_regnum);
|
||
store_register (regcache, tdep->ppc_lr_regnum);
|
||
store_register (regcache, tdep->ppc_ctr_regnum);
|
||
store_register (regcache, tdep->ppc_xer_regnum);
|
||
if (tdep->ppc_fpscr_regnum >= 0)
|
||
store_register (regcache, tdep->ppc_fpscr_regnum);
|
||
if (tdep->ppc_mq_regnum >= 0)
|
||
store_register (regcache, tdep->ppc_mq_regnum);
|
||
}
|
||
}
|
||
|
||
|
||
/* Attempt a transfer all LEN bytes starting at OFFSET between the
|
||
inferior's OBJECT:ANNEX space and GDB's READBUF/WRITEBUF buffer.
|
||
Return the number of bytes actually transferred. */
|
||
|
||
static LONGEST
|
||
rs6000_xfer_partial (struct target_ops *ops, enum target_object object,
|
||
const char *annex, gdb_byte *readbuf,
|
||
const gdb_byte *writebuf,
|
||
ULONGEST offset, LONGEST len)
|
||
{
|
||
pid_t pid = ptid_get_pid (inferior_ptid);
|
||
int arch64 = ARCH64 ();
|
||
|
||
switch (object)
|
||
{
|
||
case TARGET_OBJECT_LIBRARIES_AIX:
|
||
return rs6000_xfer_shared_libraries (ops, object, annex,
|
||
readbuf, writebuf,
|
||
offset, len);
|
||
case TARGET_OBJECT_MEMORY:
|
||
{
|
||
union
|
||
{
|
||
PTRACE_TYPE_RET word;
|
||
gdb_byte byte[sizeof (PTRACE_TYPE_RET)];
|
||
} buffer;
|
||
ULONGEST rounded_offset;
|
||
LONGEST partial_len;
|
||
|
||
/* Round the start offset down to the next long word
|
||
boundary. */
|
||
rounded_offset = offset & -(ULONGEST) sizeof (PTRACE_TYPE_RET);
|
||
|
||
/* Since ptrace will transfer a single word starting at that
|
||
rounded_offset the partial_len needs to be adjusted down to
|
||
that (remember this function only does a single transfer).
|
||
Should the required length be even less, adjust it down
|
||
again. */
|
||
partial_len = (rounded_offset + sizeof (PTRACE_TYPE_RET)) - offset;
|
||
if (partial_len > len)
|
||
partial_len = len;
|
||
|
||
if (writebuf)
|
||
{
|
||
/* If OFFSET:PARTIAL_LEN is smaller than
|
||
ROUNDED_OFFSET:WORDSIZE then a read/modify write will
|
||
be needed. Read in the entire word. */
|
||
if (rounded_offset < offset
|
||
|| (offset + partial_len
|
||
< rounded_offset + sizeof (PTRACE_TYPE_RET)))
|
||
{
|
||
/* Need part of initial word -- fetch it. */
|
||
if (arch64)
|
||
buffer.word = rs6000_ptrace64 (PT_READ_I, pid,
|
||
rounded_offset, 0, NULL);
|
||
else
|
||
buffer.word = rs6000_ptrace32 (PT_READ_I, pid,
|
||
(int *) (uintptr_t)
|
||
rounded_offset,
|
||
0, NULL);
|
||
}
|
||
|
||
/* Copy data to be written over corresponding part of
|
||
buffer. */
|
||
memcpy (buffer.byte + (offset - rounded_offset),
|
||
writebuf, partial_len);
|
||
|
||
errno = 0;
|
||
if (arch64)
|
||
rs6000_ptrace64 (PT_WRITE_D, pid,
|
||
rounded_offset, buffer.word, NULL);
|
||
else
|
||
rs6000_ptrace32 (PT_WRITE_D, pid,
|
||
(int *) (uintptr_t) rounded_offset,
|
||
buffer.word, NULL);
|
||
if (errno)
|
||
return 0;
|
||
}
|
||
|
||
if (readbuf)
|
||
{
|
||
errno = 0;
|
||
if (arch64)
|
||
buffer.word = rs6000_ptrace64 (PT_READ_I, pid,
|
||
rounded_offset, 0, NULL);
|
||
else
|
||
buffer.word = rs6000_ptrace32 (PT_READ_I, pid,
|
||
(int *)(uintptr_t)rounded_offset,
|
||
0, NULL);
|
||
if (errno)
|
||
return 0;
|
||
|
||
/* Copy appropriate bytes out of the buffer. */
|
||
memcpy (readbuf, buffer.byte + (offset - rounded_offset),
|
||
partial_len);
|
||
}
|
||
|
||
return partial_len;
|
||
}
|
||
|
||
default:
|
||
return -1;
|
||
}
|
||
}
|
||
|
||
/* Wait for the child specified by PTID to do something. Return the
|
||
process ID of the child, or MINUS_ONE_PTID in case of error; store
|
||
the status in *OURSTATUS. */
|
||
|
||
static ptid_t
|
||
rs6000_wait (struct target_ops *ops,
|
||
ptid_t ptid, struct target_waitstatus *ourstatus, int options)
|
||
{
|
||
pid_t pid;
|
||
int status, save_errno;
|
||
|
||
do
|
||
{
|
||
set_sigint_trap ();
|
||
|
||
do
|
||
{
|
||
pid = waitpid (ptid_get_pid (ptid), &status, 0);
|
||
save_errno = errno;
|
||
}
|
||
while (pid == -1 && errno == EINTR);
|
||
|
||
clear_sigint_trap ();
|
||
|
||
if (pid == -1)
|
||
{
|
||
fprintf_unfiltered (gdb_stderr,
|
||
_("Child process unexpectedly missing: %s.\n"),
|
||
safe_strerror (save_errno));
|
||
|
||
/* Claim it exited with unknown signal. */
|
||
ourstatus->kind = TARGET_WAITKIND_SIGNALLED;
|
||
ourstatus->value.sig = GDB_SIGNAL_UNKNOWN;
|
||
return inferior_ptid;
|
||
}
|
||
|
||
/* Ignore terminated detached child processes. */
|
||
if (!WIFSTOPPED (status) && pid != ptid_get_pid (inferior_ptid))
|
||
pid = -1;
|
||
}
|
||
while (pid == -1);
|
||
|
||
/* AIX has a couple of strange returns from wait(). */
|
||
|
||
/* stop after load" status. */
|
||
if (status == 0x57c)
|
||
ourstatus->kind = TARGET_WAITKIND_LOADED;
|
||
/* signal 0. I have no idea why wait(2) returns with this status word. */
|
||
else if (status == 0x7f)
|
||
ourstatus->kind = TARGET_WAITKIND_SPURIOUS;
|
||
/* A normal waitstatus. Let the usual macros deal with it. */
|
||
else
|
||
store_waitstatus (ourstatus, status);
|
||
|
||
return pid_to_ptid (pid);
|
||
}
|
||
|
||
/* Execute one dummy breakpoint instruction. This way we give the kernel
|
||
a chance to do some housekeeping and update inferior's internal data,
|
||
including u_area. */
|
||
|
||
static void
|
||
exec_one_dummy_insn (struct regcache *regcache)
|
||
{
|
||
#define DUMMY_INSN_ADDR AIX_TEXT_SEGMENT_BASE+0x200
|
||
|
||
struct gdbarch *gdbarch = get_regcache_arch (regcache);
|
||
int ret, status, pid;
|
||
CORE_ADDR prev_pc;
|
||
void *bp;
|
||
|
||
/* We plant one dummy breakpoint into DUMMY_INSN_ADDR address. We
|
||
assume that this address will never be executed again by the real
|
||
code. */
|
||
|
||
bp = deprecated_insert_raw_breakpoint (gdbarch, NULL, DUMMY_INSN_ADDR);
|
||
|
||
/* You might think this could be done with a single ptrace call, and
|
||
you'd be correct for just about every platform I've ever worked
|
||
on. However, rs6000-ibm-aix4.1.3 seems to have screwed this up --
|
||
the inferior never hits the breakpoint (it's also worth noting
|
||
powerpc-ibm-aix4.1.3 works correctly). */
|
||
prev_pc = regcache_read_pc (regcache);
|
||
regcache_write_pc (regcache, DUMMY_INSN_ADDR);
|
||
if (ARCH64 ())
|
||
ret = rs6000_ptrace64 (PT_CONTINUE, PIDGET (inferior_ptid), 1, 0, NULL);
|
||
else
|
||
ret = rs6000_ptrace32 (PT_CONTINUE, PIDGET (inferior_ptid),
|
||
(int *) 1, 0, NULL);
|
||
|
||
if (ret != 0)
|
||
perror (_("pt_continue"));
|
||
|
||
do
|
||
{
|
||
pid = waitpid (PIDGET (inferior_ptid), &status, 0);
|
||
}
|
||
while (pid != PIDGET (inferior_ptid));
|
||
|
||
regcache_write_pc (regcache, prev_pc);
|
||
deprecated_remove_raw_breakpoint (gdbarch, bp);
|
||
}
|
||
|
||
|
||
/* Set the current architecture from the host running GDB. Called when
|
||
starting a child process. */
|
||
|
||
static void (*super_create_inferior) (struct target_ops *,char *exec_file,
|
||
char *allargs, char **env, int from_tty);
|
||
static void
|
||
rs6000_create_inferior (struct target_ops * ops, char *exec_file,
|
||
char *allargs, char **env, int from_tty)
|
||
{
|
||
enum bfd_architecture arch;
|
||
unsigned long mach;
|
||
bfd abfd;
|
||
struct gdbarch_info info;
|
||
|
||
super_create_inferior (ops, exec_file, allargs, env, from_tty);
|
||
|
||
if (__power_rs ())
|
||
{
|
||
arch = bfd_arch_rs6000;
|
||
mach = bfd_mach_rs6k;
|
||
}
|
||
else
|
||
{
|
||
arch = bfd_arch_powerpc;
|
||
mach = bfd_mach_ppc;
|
||
}
|
||
|
||
/* FIXME: schauer/2002-02-25:
|
||
We don't know if we are executing a 32 or 64 bit executable,
|
||
and have no way to pass the proper word size to rs6000_gdbarch_init.
|
||
So we have to avoid switching to a new architecture, if the architecture
|
||
matches already.
|
||
Blindly calling rs6000_gdbarch_init used to work in older versions of
|
||
GDB, as rs6000_gdbarch_init incorrectly used the previous tdep to
|
||
determine the wordsize. */
|
||
if (exec_bfd)
|
||
{
|
||
const struct bfd_arch_info *exec_bfd_arch_info;
|
||
|
||
exec_bfd_arch_info = bfd_get_arch_info (exec_bfd);
|
||
if (arch == exec_bfd_arch_info->arch)
|
||
return;
|
||
}
|
||
|
||
bfd_default_set_arch_mach (&abfd, arch, mach);
|
||
|
||
gdbarch_info_init (&info);
|
||
info.bfd_arch_info = bfd_get_arch_info (&abfd);
|
||
info.abfd = exec_bfd;
|
||
|
||
if (!gdbarch_update_p (info))
|
||
internal_error (__FILE__, __LINE__,
|
||
_("rs6000_create_inferior: failed "
|
||
"to select architecture"));
|
||
}
|
||
|
||
|
||
/* Shared Object support. */
|
||
|
||
/* Return the LdInfo data for the given process. Raises an error
|
||
if the data could not be obtained.
|
||
|
||
The returned value must be deallocated after use. */
|
||
|
||
static LdInfo *
|
||
rs6000_ptrace_ldinfo (ptid_t ptid)
|
||
{
|
||
const int pid = ptid_get_pid (ptid);
|
||
int ldi_size = 1024;
|
||
LdInfo *ldi = xmalloc (ldi_size);
|
||
int rc = -1;
|
||
|
||
while (1)
|
||
{
|
||
if (ARCH64 ())
|
||
rc = rs6000_ptrace64 (PT_LDINFO, pid, (unsigned long) ldi, ldi_size,
|
||
NULL);
|
||
else
|
||
rc = rs6000_ptrace32 (PT_LDINFO, pid, (int *) ldi, ldi_size, NULL);
|
||
|
||
if (rc != -1)
|
||
break; /* Success, we got the entire ld_info data. */
|
||
|
||
if (errno != ENOMEM)
|
||
perror_with_name (_("ptrace ldinfo"));
|
||
|
||
/* ldi is not big enough. Double it and try again. */
|
||
ldi_size *= 2;
|
||
ldi = xrealloc (ldi, ldi_size);
|
||
}
|
||
|
||
return ldi;
|
||
}
|
||
|
||
/* Assuming ABFD refers to a core file, return the LdInfo data
|
||
stored in that core file. Raises an error if the data could
|
||
not be read or extracted.
|
||
|
||
The returned value much be deallocated after use. */
|
||
|
||
static LdInfo *
|
||
rs6000_core_ldinfo (bfd *abfd)
|
||
{
|
||
struct bfd_section *ldinfo_sec;
|
||
int ldinfo_size;
|
||
gdb_byte *ldinfo_buf;
|
||
struct cleanup *cleanup;
|
||
|
||
ldinfo_sec = bfd_get_section_by_name (abfd, ".ldinfo");
|
||
if (ldinfo_sec == NULL)
|
||
error (_("cannot find .ldinfo section from core file: %s"),
|
||
bfd_errmsg (bfd_get_error ()));
|
||
ldinfo_size = bfd_get_section_size (ldinfo_sec);
|
||
|
||
ldinfo_buf = xmalloc (ldinfo_size);
|
||
cleanup = make_cleanup (xfree, ldinfo_buf);
|
||
|
||
if (! bfd_get_section_contents (abfd, ldinfo_sec,
|
||
ldinfo_buf, 0, ldinfo_size))
|
||
error (_("unable to read .ldinfo section from core file: %s"),
|
||
bfd_errmsg (bfd_get_error ()));
|
||
|
||
discard_cleanups (cleanup);
|
||
return (LdInfo *) ldinfo_buf;
|
||
}
|
||
|
||
/* Append to OBJSTACK an XML string description of the shared library
|
||
corresponding to LDI, following the TARGET_OBJECT_LIBRARIES_AIX
|
||
format. */
|
||
|
||
static void
|
||
rs6000_xfer_shared_library (LdInfo *ldi, struct obstack *obstack)
|
||
{
|
||
const int arch64 = ARCH64 ();
|
||
const char *archive_name = LDI_FILENAME (ldi, arch64);
|
||
const char *member_name = archive_name + strlen (archive_name) + 1;
|
||
CORE_ADDR text_addr, data_addr;
|
||
ULONGEST text_size, data_size;
|
||
char *p;
|
||
|
||
if (arch64)
|
||
{
|
||
text_addr = ldi->l64.ldinfo_textorg;
|
||
text_size = ldi->l64.ldinfo_textsize;
|
||
data_addr = ldi->l64.ldinfo_dataorg;
|
||
data_size = ldi->l64.ldinfo_datasize;
|
||
}
|
||
else
|
||
{
|
||
/* The text and data addresses are defined as pointers.
|
||
To avoid sign-extending their value in the assignments
|
||
below, we cast their value to unsigned long first. */
|
||
text_addr = (unsigned long) ldi->l32.ldinfo_textorg;
|
||
text_size = ldi->l32.ldinfo_textsize;
|
||
data_addr = (unsigned long) ldi->l32.ldinfo_dataorg;
|
||
data_size = ldi->l32.ldinfo_datasize;
|
||
}
|
||
|
||
obstack_grow_str (obstack, "<library name=\"");
|
||
p = xml_escape_text (archive_name);
|
||
obstack_grow_str (obstack, p);
|
||
xfree (p);
|
||
obstack_grow_str (obstack, "\"");
|
||
|
||
if (member_name[0] != '\0')
|
||
{
|
||
obstack_grow_str (obstack, " member=\"");
|
||
p = xml_escape_text (member_name);
|
||
obstack_grow_str (obstack, p);
|
||
xfree (p);
|
||
obstack_grow_str (obstack, "\"");
|
||
}
|
||
|
||
obstack_grow_str (obstack, " text_addr=\"");
|
||
obstack_grow_str (obstack, core_addr_to_string (text_addr));
|
||
obstack_grow_str (obstack, "\"");
|
||
|
||
obstack_grow_str (obstack, " text_size=\"");
|
||
obstack_grow_str (obstack, pulongest (text_size));
|
||
obstack_grow_str (obstack, "\"");
|
||
|
||
obstack_grow_str (obstack, " data_addr=\"");
|
||
obstack_grow_str (obstack, core_addr_to_string (data_addr));
|
||
obstack_grow_str (obstack, "\"");
|
||
|
||
obstack_grow_str (obstack, " data_size=\"");
|
||
obstack_grow_str (obstack, pulongest (data_size));
|
||
obstack_grow_str (obstack, "\"");
|
||
|
||
obstack_grow_str (obstack, "></library>");
|
||
}
|
||
|
||
/* Implement the to_xfer_partial target_ops method for
|
||
TARGET_OBJECT_LIBRARIES_AIX objects. */
|
||
|
||
static LONGEST
|
||
rs6000_xfer_shared_libraries
|
||
(struct target_ops *ops, enum target_object object,
|
||
const char *annex, gdb_byte *readbuf, const gdb_byte *writebuf,
|
||
ULONGEST offset, LONGEST len)
|
||
{
|
||
const int arch64 = ARCH64 ();
|
||
LdInfo *ldi_data;
|
||
LdInfo *ldi;
|
||
struct obstack obstack;
|
||
const char *buf;
|
||
LONGEST len_avail;
|
||
|
||
if (writebuf)
|
||
return -1;
|
||
|
||
/* Get the ldinfo raw data: If debugging a live process, we get it
|
||
using ptrace. Otherwise, the info is stored in the .ldinfo
|
||
section of the core file. */
|
||
|
||
if (target_has_execution)
|
||
ldi_data = rs6000_ptrace_ldinfo (inferior_ptid);
|
||
else
|
||
ldi_data = rs6000_core_ldinfo (core_bfd);
|
||
|
||
/* Convert the raw data into an XML representation. */
|
||
|
||
obstack_init (&obstack);
|
||
obstack_grow_str (&obstack, "<library-list-aix version=\"1.0\">\n");
|
||
|
||
ldi = ldi_data;
|
||
while (1)
|
||
{
|
||
/* Close the fd. We cannot use it, because we cannot assume
|
||
that the user of this descriptor will be in the same
|
||
process. */
|
||
close (LDI_FD (ldi, arch64));
|
||
|
||
rs6000_xfer_shared_library (ldi, &obstack);
|
||
|
||
if (!LDI_NEXT (ldi, arch64))
|
||
break;
|
||
ldi = (LdInfo *) ((char *) ldi + LDI_NEXT (ldi, arch64));
|
||
}
|
||
|
||
xfree (ldi_data);
|
||
|
||
obstack_grow_str0 (&obstack, "</library-list-aix>\n");
|
||
|
||
buf = obstack_finish (&obstack);
|
||
len_avail = strlen (buf);
|
||
if (offset >= len_avail)
|
||
len= 0;
|
||
else
|
||
{
|
||
if (len > len_avail - offset)
|
||
len = len_avail - offset;
|
||
memcpy (readbuf, buf + offset, len);
|
||
}
|
||
|
||
obstack_free (&obstack, NULL);
|
||
return len;
|
||
}
|
||
|
||
void _initialize_rs6000_nat (void);
|
||
|
||
void
|
||
_initialize_rs6000_nat (void)
|
||
{
|
||
struct target_ops *t;
|
||
|
||
t = inf_ptrace_target ();
|
||
t->to_fetch_registers = rs6000_fetch_inferior_registers;
|
||
t->to_store_registers = rs6000_store_inferior_registers;
|
||
t->to_xfer_partial = rs6000_xfer_partial;
|
||
|
||
super_create_inferior = t->to_create_inferior;
|
||
t->to_create_inferior = rs6000_create_inferior;
|
||
|
||
t->to_wait = rs6000_wait;
|
||
|
||
add_target (t);
|
||
}
|