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2002-04-20 Daniel Jacobowitz <drow@mvista.com>

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* gdbserver/mem-break.c: New file.
        * gdbserver/mem-break.h: New file.
        * gdbserver/Makefile.in: Add mem-break.o rule; update server.h
        dependencies.
        * gdbserver/inferiors.c (struct inferior_info): Add target_data
        member.
        (clear_inferiors): Free target_data member if set.
        (inferior_target_data, set_inferior_target_data): New functions.
        * gdbserver/linux-i386-low.c (i386_breakpoint, i386_breakpoint_len)
        (i386_stop_pc, i386_set_pc): New.  Add to the_low_target.
        * gdbserver/linux-low.c (linux_bp_reinsert): New variable.
        (struct inferior_linux_data): New.
        (linux_create_inferior): Use set_inferior_target_data.
        (linux_attach): Likewise.  Call add_inferior.
        (linux_wait_for_one_inferior): New function.
        (linux_wait): Call it.
        (linux_write_memory): Add const.
        (initialize_low): Call set_breakpoint_data.
        * gdbserver/linux-low.h (struct linux_target_ops): Add breakpoint
        handling members.
        * gdbserver/server.c (attach_inferior): Remove extra add_inferior
        call.
        * gdbserver/server.h: Include mem-break.h.  Update inferior.c
        prototypes.
        * gdbserver/target.c (read_inferior_memory)
        (write_inferior_memory): New functions.
        * gdbserver/target.h (read_inferior_memory)
        (write_inferior_memory): Change macros to prototypes.
        (struct target_ops): Update comments.  Add const to write_memory
        definition.
This commit is contained in:
Daniel Jacobowitz
2002-04-20 17:04:09 +00:00
parent e101598283
commit 611cb4a542
12 changed files with 548 additions and 16 deletions
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280
gdb/gdbserver/mem-break.c Normal file
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/* Memory breakpoint operations for the remote server for GDB.
Copyright 2002
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., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
#include "server.h"
const 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_at);
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
set_breakpoint_data (const char *bp_data, int bp_len)
{
breakpoint_data = bp_data;
breakpoint_len = bp_len;
}
void
check_mem_read (CORE_ADDR mem_addr, 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
check_mem_write (CORE_ADDR mem_addr, 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);
}
}