binutils-gdb/gdb/gdbserver/mem-break.c

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/* Memory breakpoint operations for the remote server for GDB.
Copyright (C) 2002, 2003, 2005
Free Software Foundation, Inc.
Contributed by MontaVista Software.
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 2 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, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor,
Boston, MA 02110-1301, USA. */
#include "server.h"
* acconfig.h: Remove. * configure.ac: Add a test for socklen_t. Use three-argument AC_DEFINE throughout. * config.in: Regenerated using autoheader 2.59. * configure: Regenerated. * gdbreplay.c (socklen_t): Provide a default. (remote_open): Use socklen_t. * remote-utils.c (socklen_t): Provide a default. (remote_open): Use socklen_t. (convert_int_to_ascii, convert_ascii_to_int, decode_M_packet): Use unsigned char. * i387-fp.c (struct i387_fsave, struct i387_fxsave): Use unsigned char for buffers. * linux-low.c (linux_read_memory, linux_write_memory) (linux_read_auxv): Likewise. * mem-break.c (breakpoint_data, set_breakpoint_data, check_mem_read) (check_mem_write): Likewise. * mem-break.h (set_breakpoint_data, check_mem_read, check_mem_write): Likewise. * regcache.c (struct inferior_rgcache_data, registers_to_string) (registers_from_string, register_data): Likewise. * server.c (handle_query, main): Likewise. * server.h (convert_ascii_to_int, convert_int_to_ascii) (decode_M_packet): Likewise. * target.c (read_inferior_memory, write_inferior_memory): Likewise. * target.h (struct target_ops): Update read_memory, write_memory, and read_auxv. (read_inferior_memory, write_inferior_memory): Update. * linux-low.h (struct linux_target_ops): Change type of breakpoint to unsigned char *. * linux-arm-low.c, linux-cris-low.c, linux-crisv32-low.c, linux-i386-low.c, linux-m32r-low.c, linux-m68k-low.c, linux-mips-low.c, linux-ppc-low.c, linux-ppc64-low.c, linux-s390-low.c, linux-sh-low.c: Update for changes in read_inferior_memory and the_low_target->breakpoint.
2005-06-13 03:59:22 +02:00
const unsigned char *breakpoint_data;
int breakpoint_len;
#define MAX_BREAKPOINT_LEN 8
struct breakpoint
{
struct breakpoint *next;
CORE_ADDR pc;
unsigned char old_data[MAX_BREAKPOINT_LEN];
/* Non-zero iff we are stepping over this breakpoint. */
int reinserting;
/* Non-NULL iff this breakpoint was inserted to step over
another one. Points to the other breakpoint (which is also
in the *next chain somewhere). */
struct breakpoint *breakpoint_to_reinsert;
/* Function to call when we hit this breakpoint. */
void (*handler) (CORE_ADDR);
};
struct breakpoint *breakpoints;
void
set_breakpoint_at (CORE_ADDR where, void (*handler) (CORE_ADDR))
{
struct breakpoint *bp;
if (breakpoint_data == NULL)
error ("Target does not support breakpoints.");
bp = malloc (sizeof (struct breakpoint));
memset (bp, 0, sizeof (struct breakpoint));
(*the_target->read_memory) (where, bp->old_data,
breakpoint_len);
(*the_target->write_memory) (where, breakpoint_data,
breakpoint_len);
bp->pc = where;
bp->handler = handler;
bp->next = breakpoints;
breakpoints = bp;
}
static void
delete_breakpoint (struct breakpoint *bp)
{
struct breakpoint *cur;
if (breakpoints == bp)
{
breakpoints = bp->next;
(*the_target->write_memory) (bp->pc, bp->old_data,
breakpoint_len);
free (bp);
return;
}
cur = breakpoints;
while (cur->next)
{
if (cur->next == bp)
{
cur->next = bp->next;
(*the_target->write_memory) (bp->pc, bp->old_data,
breakpoint_len);
free (bp);
return;
}
}
warning ("Could not find breakpoint in list.");
}
static struct breakpoint *
find_breakpoint_at (CORE_ADDR where)
{
struct breakpoint *bp = breakpoints;
while (bp != NULL)
{
if (bp->pc == where)
return bp;
bp = bp->next;
}
return NULL;
}
static void
reinsert_breakpoint_handler (CORE_ADDR stop_pc)
{
struct breakpoint *stop_bp, *orig_bp;
stop_bp = find_breakpoint_at (stop_pc);
if (stop_bp == NULL)
error ("lost the stopping breakpoint.");
orig_bp = stop_bp->breakpoint_to_reinsert;
if (orig_bp == NULL)
error ("no breakpoint to reinsert");
(*the_target->write_memory) (orig_bp->pc, breakpoint_data,
breakpoint_len);
orig_bp->reinserting = 0;
delete_breakpoint (stop_bp);
}
void
reinsert_breakpoint_by_bp (CORE_ADDR stop_pc, CORE_ADDR stop_at)
{
struct breakpoint *bp, *orig_bp;
set_breakpoint_at (stop_at, reinsert_breakpoint_handler);
orig_bp = find_breakpoint_at (stop_pc);
if (orig_bp == NULL)
error ("Could not find original breakpoint in list.");
bp = find_breakpoint_at (stop_at);
if (bp == NULL)
error ("Could not find breakpoint in list (reinserting by breakpoint).");
bp->breakpoint_to_reinsert = orig_bp;
(*the_target->write_memory) (orig_bp->pc, orig_bp->old_data,
breakpoint_len);
orig_bp->reinserting = 1;
}
void
uninsert_breakpoint (CORE_ADDR stopped_at)
{
struct breakpoint *bp;
bp = find_breakpoint_at (stopped_at);
if (bp == NULL)
error ("Could not find breakpoint in list (uninserting).");
(*the_target->write_memory) (bp->pc, bp->old_data,
breakpoint_len);
bp->reinserting = 1;
}
void
reinsert_breakpoint (CORE_ADDR stopped_at)
{
struct breakpoint *bp;
bp = find_breakpoint_at (stopped_at);
if (bp == NULL)
error ("Could not find breakpoint in list (uninserting).");
if (! bp->reinserting)
error ("Breakpoint already inserted at reinsert time.");
(*the_target->write_memory) (bp->pc, breakpoint_data,
breakpoint_len);
bp->reinserting = 0;
}
int
check_breakpoints (CORE_ADDR stop_pc)
{
struct breakpoint *bp;
bp = find_breakpoint_at (stop_pc);
if (bp == NULL)
return 0;
if (bp->reinserting)
{
warning ("Hit a removed breakpoint?");
return 0;
}
(*bp->handler) (bp->pc);
return 1;
}
void
* acconfig.h: Remove. * configure.ac: Add a test for socklen_t. Use three-argument AC_DEFINE throughout. * config.in: Regenerated using autoheader 2.59. * configure: Regenerated. * gdbreplay.c (socklen_t): Provide a default. (remote_open): Use socklen_t. * remote-utils.c (socklen_t): Provide a default. (remote_open): Use socklen_t. (convert_int_to_ascii, convert_ascii_to_int, decode_M_packet): Use unsigned char. * i387-fp.c (struct i387_fsave, struct i387_fxsave): Use unsigned char for buffers. * linux-low.c (linux_read_memory, linux_write_memory) (linux_read_auxv): Likewise. * mem-break.c (breakpoint_data, set_breakpoint_data, check_mem_read) (check_mem_write): Likewise. * mem-break.h (set_breakpoint_data, check_mem_read, check_mem_write): Likewise. * regcache.c (struct inferior_rgcache_data, registers_to_string) (registers_from_string, register_data): Likewise. * server.c (handle_query, main): Likewise. * server.h (convert_ascii_to_int, convert_int_to_ascii) (decode_M_packet): Likewise. * target.c (read_inferior_memory, write_inferior_memory): Likewise. * target.h (struct target_ops): Update read_memory, write_memory, and read_auxv. (read_inferior_memory, write_inferior_memory): Update. * linux-low.h (struct linux_target_ops): Change type of breakpoint to unsigned char *. * linux-arm-low.c, linux-cris-low.c, linux-crisv32-low.c, linux-i386-low.c, linux-m32r-low.c, linux-m68k-low.c, linux-mips-low.c, linux-ppc-low.c, linux-ppc64-low.c, linux-s390-low.c, linux-sh-low.c: Update for changes in read_inferior_memory and the_low_target->breakpoint.
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set_breakpoint_data (const unsigned char *bp_data, int bp_len)
{
breakpoint_data = bp_data;
breakpoint_len = bp_len;
}
void
* acconfig.h: Remove. * configure.ac: Add a test for socklen_t. Use three-argument AC_DEFINE throughout. * config.in: Regenerated using autoheader 2.59. * configure: Regenerated. * gdbreplay.c (socklen_t): Provide a default. (remote_open): Use socklen_t. * remote-utils.c (socklen_t): Provide a default. (remote_open): Use socklen_t. (convert_int_to_ascii, convert_ascii_to_int, decode_M_packet): Use unsigned char. * i387-fp.c (struct i387_fsave, struct i387_fxsave): Use unsigned char for buffers. * linux-low.c (linux_read_memory, linux_write_memory) (linux_read_auxv): Likewise. * mem-break.c (breakpoint_data, set_breakpoint_data, check_mem_read) (check_mem_write): Likewise. * mem-break.h (set_breakpoint_data, check_mem_read, check_mem_write): Likewise. * regcache.c (struct inferior_rgcache_data, registers_to_string) (registers_from_string, register_data): Likewise. * server.c (handle_query, main): Likewise. * server.h (convert_ascii_to_int, convert_int_to_ascii) (decode_M_packet): Likewise. * target.c (read_inferior_memory, write_inferior_memory): Likewise. * target.h (struct target_ops): Update read_memory, write_memory, and read_auxv. (read_inferior_memory, write_inferior_memory): Update. * linux-low.h (struct linux_target_ops): Change type of breakpoint to unsigned char *. * linux-arm-low.c, linux-cris-low.c, linux-crisv32-low.c, linux-i386-low.c, linux-m32r-low.c, linux-m68k-low.c, linux-mips-low.c, linux-ppc-low.c, linux-ppc64-low.c, linux-s390-low.c, linux-sh-low.c: Update for changes in read_inferior_memory and the_low_target->breakpoint.
2005-06-13 03:59:22 +02:00
check_mem_read (CORE_ADDR mem_addr, unsigned char *buf, int mem_len)
{
struct breakpoint *bp = breakpoints;
CORE_ADDR mem_end = mem_addr + mem_len;
for (; bp != NULL; bp = bp->next)
{
CORE_ADDR bp_end = bp->pc + breakpoint_len;
CORE_ADDR start, end;
int copy_offset, copy_len, buf_offset;
if (mem_addr >= bp_end)
continue;
if (bp->pc >= mem_end)
continue;
start = bp->pc;
if (mem_addr > start)
start = mem_addr;
end = bp_end;
if (end > mem_end)
end = mem_end;
copy_len = end - start;
copy_offset = start - bp->pc;
buf_offset = start - mem_addr;
memcpy (buf + buf_offset, bp->old_data + copy_offset, copy_len);
}
}
void
* acconfig.h: Remove. * configure.ac: Add a test for socklen_t. Use three-argument AC_DEFINE throughout. * config.in: Regenerated using autoheader 2.59. * configure: Regenerated. * gdbreplay.c (socklen_t): Provide a default. (remote_open): Use socklen_t. * remote-utils.c (socklen_t): Provide a default. (remote_open): Use socklen_t. (convert_int_to_ascii, convert_ascii_to_int, decode_M_packet): Use unsigned char. * i387-fp.c (struct i387_fsave, struct i387_fxsave): Use unsigned char for buffers. * linux-low.c (linux_read_memory, linux_write_memory) (linux_read_auxv): Likewise. * mem-break.c (breakpoint_data, set_breakpoint_data, check_mem_read) (check_mem_write): Likewise. * mem-break.h (set_breakpoint_data, check_mem_read, check_mem_write): Likewise. * regcache.c (struct inferior_rgcache_data, registers_to_string) (registers_from_string, register_data): Likewise. * server.c (handle_query, main): Likewise. * server.h (convert_ascii_to_int, convert_int_to_ascii) (decode_M_packet): Likewise. * target.c (read_inferior_memory, write_inferior_memory): Likewise. * target.h (struct target_ops): Update read_memory, write_memory, and read_auxv. (read_inferior_memory, write_inferior_memory): Update. * linux-low.h (struct linux_target_ops): Change type of breakpoint to unsigned char *. * linux-arm-low.c, linux-cris-low.c, linux-crisv32-low.c, linux-i386-low.c, linux-m32r-low.c, linux-m68k-low.c, linux-mips-low.c, linux-ppc-low.c, linux-ppc64-low.c, linux-s390-low.c, linux-sh-low.c: Update for changes in read_inferior_memory and the_low_target->breakpoint.
2005-06-13 03:59:22 +02:00
check_mem_write (CORE_ADDR mem_addr, unsigned char *buf, int mem_len)
{
struct breakpoint *bp = breakpoints;
CORE_ADDR mem_end = mem_addr + mem_len;
for (; bp != NULL; bp = bp->next)
{
CORE_ADDR bp_end = bp->pc + breakpoint_len;
CORE_ADDR start, end;
int copy_offset, copy_len, buf_offset;
if (mem_addr >= bp_end)
continue;
if (bp->pc >= mem_end)
continue;
start = bp->pc;
if (mem_addr > start)
start = mem_addr;
end = bp_end;
if (end > mem_end)
end = mem_end;
copy_len = end - start;
copy_offset = start - bp->pc;
buf_offset = start - mem_addr;
memcpy (bp->old_data + copy_offset, buf + buf_offset, copy_len);
if (bp->reinserting == 0)
memcpy (buf + buf_offset, breakpoint_data + copy_offset, copy_len);
}
}