279 lines
6.3 KiB
C
279 lines
6.3 KiB
C
/* Memory breakpoint operations for the remote server for GDB.
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Copyright 2002
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Free Software Foundation, Inc.
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Contributed by MontaVista Software.
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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
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#include "server.h"
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const char *breakpoint_data;
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int breakpoint_len;
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#define MAX_BREAKPOINT_LEN 8
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struct breakpoint
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{
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struct breakpoint *next;
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CORE_ADDR pc;
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unsigned char old_data[MAX_BREAKPOINT_LEN];
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/* Non-zero iff we are stepping over this breakpoint. */
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int reinserting;
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/* Non-NULL iff this breakpoint was inserted to step over
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another one. Points to the other breakpoint (which is also
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in the *next chain somewhere). */
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struct breakpoint *breakpoint_to_reinsert;
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/* Function to call when we hit this breakpoint. */
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void (*handler) (CORE_ADDR);
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};
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struct breakpoint *breakpoints;
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void
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set_breakpoint_at (CORE_ADDR where, void (*handler) (CORE_ADDR))
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{
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struct breakpoint *bp;
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if (breakpoint_data == NULL)
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error ("Target does not support breakpoints.");
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bp = malloc (sizeof (struct breakpoint));
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memset (bp, 0, sizeof (struct breakpoint));
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(*the_target->read_memory) (where, bp->old_data,
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breakpoint_len);
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(*the_target->write_memory) (where, breakpoint_data,
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breakpoint_len);
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bp->pc = where;
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bp->handler = handler;
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bp->next = breakpoints;
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breakpoints = bp;
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}
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static void
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delete_breakpoint (struct breakpoint *bp)
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{
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struct breakpoint *cur;
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if (breakpoints == bp)
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{
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breakpoints = bp->next;
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(*the_target->write_memory) (bp->pc, bp->old_data,
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breakpoint_len);
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free (bp);
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return;
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}
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cur = breakpoints;
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while (cur->next)
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{
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if (cur->next == bp)
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{
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cur->next = bp->next;
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(*the_target->write_memory) (bp->pc, bp->old_data,
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breakpoint_len);
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free (bp);
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return;
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}
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}
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warning ("Could not find breakpoint in list.");
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}
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static struct breakpoint *
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find_breakpoint_at (CORE_ADDR where)
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{
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struct breakpoint *bp = breakpoints;
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while (bp != NULL)
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{
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if (bp->pc == where)
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return bp;
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bp = bp->next;
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}
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return NULL;
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}
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static void
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reinsert_breakpoint_handler (CORE_ADDR stop_pc)
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{
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struct breakpoint *stop_bp, *orig_bp;
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stop_bp = find_breakpoint_at (stop_pc);
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if (stop_bp == NULL)
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error ("lost the stopping breakpoint.");
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orig_bp = stop_bp->breakpoint_to_reinsert;
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if (orig_bp == NULL)
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error ("no breakpoint to reinsert");
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(*the_target->write_memory) (orig_bp->pc, breakpoint_data,
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breakpoint_len);
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orig_bp->reinserting = 0;
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delete_breakpoint (stop_bp);
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}
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void
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reinsert_breakpoint_by_bp (CORE_ADDR stop_pc, CORE_ADDR stop_at)
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{
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struct breakpoint *bp, *orig_bp;
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set_breakpoint_at (stop_at, reinsert_breakpoint_handler);
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orig_bp = find_breakpoint_at (stop_pc);
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if (orig_bp == NULL)
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error ("Could not find original breakpoint in list.");
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bp = find_breakpoint_at (stop_at);
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if (bp == NULL)
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error ("Could not find breakpoint in list (reinserting by breakpoint).");
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bp->breakpoint_to_reinsert = orig_bp;
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(*the_target->write_memory) (orig_bp->pc, orig_bp->old_data,
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breakpoint_len);
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orig_bp->reinserting = 1;
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}
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void
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uninsert_breakpoint (CORE_ADDR stopped_at)
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{
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struct breakpoint *bp;
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bp = find_breakpoint_at (stopped_at);
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if (bp == NULL)
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error ("Could not find breakpoint in list (uninserting).");
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(*the_target->write_memory) (bp->pc, bp->old_data,
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breakpoint_len);
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bp->reinserting = 1;
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}
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void
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reinsert_breakpoint (CORE_ADDR stopped_at)
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{
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struct breakpoint *bp;
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bp = find_breakpoint_at (stopped_at);
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if (bp == NULL)
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error ("Could not find breakpoint in list (uninserting).");
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if (! bp->reinserting)
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error ("Breakpoint already inserted at reinsert time.");
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(*the_target->write_memory) (bp->pc, breakpoint_data,
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breakpoint_len);
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bp->reinserting = 0;
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}
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int
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check_breakpoints (CORE_ADDR stop_pc)
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{
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struct breakpoint *bp;
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bp = find_breakpoint_at (stop_pc);
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if (bp == NULL)
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return 0;
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if (bp->reinserting)
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{
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warning ("Hit a removed breakpoint?");
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return 0;
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}
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(*bp->handler) (bp->pc);
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return 1;
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}
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void
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set_breakpoint_data (const char *bp_data, int bp_len)
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{
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breakpoint_data = bp_data;
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breakpoint_len = bp_len;
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}
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void
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check_mem_read (CORE_ADDR mem_addr, char *buf, int mem_len)
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{
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struct breakpoint *bp = breakpoints;
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CORE_ADDR mem_end = mem_addr + mem_len;
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for (; bp != NULL; bp = bp->next)
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{
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CORE_ADDR bp_end = bp->pc + breakpoint_len;
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CORE_ADDR start, end;
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int copy_offset, copy_len, buf_offset;
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if (mem_addr >= bp_end)
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continue;
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if (bp->pc >= mem_end)
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continue;
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start = bp->pc;
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if (mem_addr > start)
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start = mem_addr;
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end = bp_end;
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if (end > mem_end)
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end = mem_end;
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copy_len = end - start;
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copy_offset = start - bp->pc;
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buf_offset = start - mem_addr;
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memcpy (buf + buf_offset, bp->old_data + copy_offset, copy_len);
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}
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}
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void
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check_mem_write (CORE_ADDR mem_addr, char *buf, int mem_len)
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{
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struct breakpoint *bp = breakpoints;
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CORE_ADDR mem_end = mem_addr + mem_len;
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for (; bp != NULL; bp = bp->next)
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{
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CORE_ADDR bp_end = bp->pc + breakpoint_len;
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CORE_ADDR start, end;
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int copy_offset, copy_len, buf_offset;
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if (mem_addr >= bp_end)
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continue;
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if (bp->pc >= mem_end)
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continue;
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start = bp->pc;
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if (mem_addr > start)
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start = mem_addr;
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end = bp_end;
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if (end > mem_end)
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end = mem_end;
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copy_len = end - start;
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copy_offset = start - bp->pc;
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buf_offset = start - mem_addr;
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memcpy (bp->old_data + copy_offset, buf + buf_offset, copy_len);
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if (bp->reinserting == 0)
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memcpy (buf + buf_offset, breakpoint_data + copy_offset, copy_len);
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}
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}
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