gdb/gdbserver/mem-break.c - third_party/binutils-gdb - Git at Google

 /* Memory breakpoint operations for the remote server for GDB.
    Copyright (C) 2002, 2003, 2005, 2007, 2008, 2009, 2010
    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 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 "server.h"

 const unsigned char *breakpoint_data;
 int breakpoint_len;

 #define MAX_BREAKPOINT_LEN 8

 /* The type of a breakpoint.  */
 enum bkpt_type
   {
     /* A basic-software-single-step breakpoint.  */
     reinsert_breakpoint,

     /* Any other breakpoint type that doesn't require specific
        treatment goes here.  E.g., an event breakpoint.  */
     other_breakpoint,
   };

 struct breakpoint
 {
   struct breakpoint *next;
   CORE_ADDR pc;
   unsigned char old_data[MAX_BREAKPOINT_LEN];

   /* Non-zero if this breakpoint is currently inserted in the
      inferior.  */
   int inserted;

   /* The breakpoint's type.  */
   enum bkpt_type type;

   /* Function to call when we hit this breakpoint.  If it returns 1,
      the breakpoint shall be deleted; 0, it will be left inserted.  */
   int (*handler) (CORE_ADDR);
 };

 static void uninsert_breakpoint (struct breakpoint *bp);

 static struct breakpoint *
 set_raw_breakpoint_at (CORE_ADDR where)
 {
   struct process_info *proc = current_process ();
   struct breakpoint *bp;
   int err;

   if (breakpoint_data == NULL)
     error ("Target does not support breakpoints.");

   bp = xcalloc (1, sizeof (*bp));
   bp->pc = where;

   err = (*the_target->read_memory) (where, bp->old_data,
 				    breakpoint_len);
   if (err != 0)
     {
       if (debug_threads)
 	fprintf (stderr,
 		 "Failed to read shadow memory of"
 		 " breakpoint at 0x%s (%s).\n",
 		 paddress (where), strerror (err));
       free (bp);
       return NULL;
     }

   err = (*the_target->write_memory) (where, breakpoint_data,
 				     breakpoint_len);
   if (err != 0)
     {
       if (debug_threads)
 	fprintf (stderr,
 		 "Failed to insert breakpoint at 0x%s (%s).\n",
 		 paddress (where), strerror (err));
       free (bp);
       return NULL;
     }

   /* Link the breakpoint in.  */
   bp->inserted = 1;
   bp->next = proc->breakpoints;
   proc->breakpoints = bp;
   return bp;
 }

 struct breakpoint *
 set_breakpoint_at (CORE_ADDR where, int (*handler) (CORE_ADDR))
 {
   struct process_info *proc = current_process ();
   struct breakpoint *bp;

   bp = set_raw_breakpoint_at (where);

   if (bp == NULL)
     {
       /* warn? */
       return NULL;
     }

   bp = xcalloc (1, sizeof (struct breakpoint));
   bp->type = other_breakpoint;
   bp->handler = handler;

   bp->next = proc->breakpoints;
   proc->breakpoints = bp;

   return bp;
 }

 static void
 delete_breakpoint (struct breakpoint *todel)
 {
   struct process_info *proc = current_process ();
   struct breakpoint *bp, **bp_link;

   bp = proc->breakpoints;
   bp_link = &proc->breakpoints;

   while (bp)
     {
       if (bp == todel)
 	{
 	  *bp_link = bp->next;

 	  uninsert_breakpoint (bp);
 	  free (bp);
 	  return;
 	}
       else
 	{
 	  bp_link = &bp->next;
 	  bp = *bp_link;
 	}
     }

   warning ("Could not find breakpoint in list.");
 }

 static struct breakpoint *
 find_breakpoint_at (CORE_ADDR where)
 {
   struct process_info *proc = current_process ();
   struct breakpoint *bp = proc->breakpoints;

   while (bp != NULL)
     {
       if (bp->pc == where)
 	return bp;
       bp = bp->next;
     }

   return NULL;
 }

 void
 delete_breakpoint_at (CORE_ADDR addr)
 {
   struct breakpoint *bp = find_breakpoint_at (addr);
   if (bp != NULL)
     delete_breakpoint (bp);
 }

 void
 set_reinsert_breakpoint (CORE_ADDR stop_at)
 {
   struct breakpoint *bp;

   bp = set_breakpoint_at (stop_at, NULL);

   bp->type = reinsert_breakpoint;
 }

 void
 delete_reinsert_breakpoints (void)
 {
   struct process_info *proc = current_process ();
   struct breakpoint *bp, **bp_link;

   bp = proc->breakpoints;
   bp_link = &proc->breakpoints;

   while (bp)
     {
       if (bp->type == reinsert_breakpoint)
 	{
 	  *bp_link = bp->next;

 	  /* If something goes wrong, maybe this is a shared library
 	     breakpoint, and the shared library has been unmapped.
 	     Assume the breakpoint is gone anyway.  */
 	  uninsert_breakpoint (bp);
 	  free (bp);

 	  bp = *bp_link;
 	}
       else
 	{
 	  bp_link = &bp->next;
 	  bp = *bp_link;
 	}
     }
 }

 static void
 uninsert_breakpoint (struct breakpoint *bp)
 {
   if (bp->inserted)
     {
       int err;

       bp->inserted = 0;
       err = (*the_target->write_memory) (bp->pc, bp->old_data,
 					 breakpoint_len);
       if (err != 0)
 	{
 	  bp->inserted = 1;

 	  if (debug_threads)
 	    fprintf (stderr,
 		     "Failed to uninsert raw breakpoint at 0x%s (%s).\n",
 		     paddress (bp->pc), strerror (err));
 	}
     }
 }

 void
 uninsert_breakpoints_at (CORE_ADDR pc)
 {
   struct breakpoint *bp;

   bp = find_breakpoint_at (pc);
   if (bp == NULL)
     {
       /* This can happen when we remove all breakpoints while handling
 	 a step-over.  */
       if (debug_threads)
 	fprintf (stderr,
 		 "Could not find breakpoint at 0x%s "
 		 "in list (uninserting).\n",
 		 paddress (pc));
       return;
     }

   if (bp->inserted)
     uninsert_breakpoint (bp);
 }

 static void
 reinsert_raw_breakpoint (struct breakpoint *bp)
 {
   int err;

   if (bp->inserted)
     error ("Breakpoint already inserted at reinsert time.");

   err = (*the_target->write_memory) (bp->pc, breakpoint_data,
 				     breakpoint_len);
   if (err == 0)
     bp->inserted = 1;
   else if (debug_threads)
     fprintf (stderr,
 	     "Failed to reinsert breakpoint at 0x%s (%s).\n",
 	     paddress (bp->pc), strerror (err));
 }

 void
 reinsert_breakpoints_at (CORE_ADDR pc)
 {
   struct breakpoint *bp;

   bp = find_breakpoint_at (pc);
   if (bp == NULL)
     {
       /* This can happen when we remove all breakpoints while handling
 	 a step-over.  */
       if (debug_threads)
 	fprintf (stderr,
 		 "Could not find breakpoint at 0x%s "
 		 "in list (reinserting).\n",
 		 paddress (pc));
       return;
     }

   reinsert_raw_breakpoint (bp);
 }

 void
 check_breakpoints (CORE_ADDR stop_pc)
 {
   struct process_info *proc = current_process ();
   struct breakpoint *bp, **bp_link;

   bp = proc->breakpoints;
   bp_link = &proc->breakpoints;

   while (bp)
     {
       if (bp->pc == stop_pc)
 	{
 	  if (!bp->inserted)
 	    {
 	      warning ("Hit a removed breakpoint?");
 	      return;
 	    }

 	  if (bp->handler != NULL && (*bp->handler) (stop_pc))
 	    {
 	      *bp_link = bp->next;

 	      delete_breakpoint (bp);

 	      bp = *bp_link;
 	      continue;
 	    }
 	}

       bp_link = &bp->next;
       bp = *bp_link;
     }
 }

 void
 set_breakpoint_data (const unsigned char *bp_data, int bp_len)
 {
   breakpoint_data = bp_data;
   breakpoint_len = bp_len;
 }

 int
 breakpoint_here (CORE_ADDR addr)
 {
   struct process_info *proc = current_process ();
   struct breakpoint *bp;

   for (bp = proc->breakpoints; bp != NULL; bp = bp->next)
     if (bp->pc == addr)
       return 1;

   return 0;
 }

 int
 breakpoint_inserted_here (CORE_ADDR addr)
 {
   struct process_info *proc = current_process ();
   struct breakpoint *bp;

   for (bp = proc->breakpoints; bp != NULL; bp = bp->next)
     if (bp->pc == addr && bp->inserted)
       return 1;

   return 0;
 }

 void
 check_mem_read (CORE_ADDR mem_addr, unsigned char *buf, int mem_len)
 {
   struct process_info *proc = current_process ();
   struct breakpoint *bp = proc->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, unsigned char *buf, int mem_len)
 {
   struct process_info *proc = current_process ();
   struct breakpoint *bp = proc->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->inserted)
 	memcpy (buf + buf_offset, breakpoint_data + copy_offset, copy_len);
     }
 }

 /* Delete all breakpoints, and un-insert them from the inferior.  */

 void
 delete_all_breakpoints (void)
 {
   struct process_info *proc = current_process ();

   while (proc->breakpoints)
     delete_breakpoint (proc->breakpoints);
 }

 /* Release all breakpoints, but do not try to un-insert them from the
    inferior.  */

 void
 free_all_breakpoints (struct process_info *proc)
 {
   struct breakpoint *bp;

   while (proc->breakpoints)
     {
       bp = proc->breakpoints;
       proc->breakpoints = bp->next;
       free (bp);
     }
 }
	/* Memory breakpoint operations for the remote server for GDB.
	Copyright (C) 2002, 2003, 2005, 2007, 2008, 2009, 2010
	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 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 "server.h"

	const unsigned char *breakpoint_data;
	int breakpoint_len;

	#define MAX_BREAKPOINT_LEN 8

	/* The type of a breakpoint. */
	enum bkpt_type
	{
	/* A basic-software-single-step breakpoint. */
	reinsert_breakpoint,

	/* Any other breakpoint type that doesn't require specific
	treatment goes here. E.g., an event breakpoint. */
	other_breakpoint,
	};

	struct breakpoint
	{
	struct breakpoint *next;
	CORE_ADDR pc;
	unsigned char old_data[MAX_BREAKPOINT_LEN];

	/* Non-zero if this breakpoint is currently inserted in the
	inferior. */
	int inserted;

	/* The breakpoint's type. */
	enum bkpt_type type;

	/* Function to call when we hit this breakpoint. If it returns 1,
	the breakpoint shall be deleted; 0, it will be left inserted. */
	int (*handler) (CORE_ADDR);
	};

	static void uninsert_breakpoint (struct breakpoint *bp);

	static struct breakpoint *
	set_raw_breakpoint_at (CORE_ADDR where)
	{
	struct process_info *proc = current_process ();
	struct breakpoint *bp;
	int err;

	if (breakpoint_data == NULL)
	error ("Target does not support breakpoints.");

	bp = xcalloc (1, sizeof (*bp));
	bp->pc = where;

	err = (*the_target->read_memory) (where, bp->old_data,
	breakpoint_len);
	if (err != 0)
	{
	if (debug_threads)
	fprintf (stderr,
	"Failed to read shadow memory of"
	" breakpoint at 0x%s (%s).\n",
	paddress (where), strerror (err));
	free (bp);
	return NULL;
	}

	err = (*the_target->write_memory) (where, breakpoint_data,
	breakpoint_len);
	if (err != 0)
	{
	if (debug_threads)
	fprintf (stderr,
	"Failed to insert breakpoint at 0x%s (%s).\n",
	paddress (where), strerror (err));
	free (bp);
	return NULL;
	}

	/* Link the breakpoint in. */
	bp->inserted = 1;
	bp->next = proc->breakpoints;
	proc->breakpoints = bp;
	return bp;
	}

	struct breakpoint *
	set_breakpoint_at (CORE_ADDR where, int (*handler) (CORE_ADDR))
	{
	struct process_info *proc = current_process ();
	struct breakpoint *bp;

	bp = set_raw_breakpoint_at (where);

	if (bp == NULL)
	{
	/* warn? */
	return NULL;
	}

	bp = xcalloc (1, sizeof (struct breakpoint));
	bp->type = other_breakpoint;
	bp->handler = handler;

	bp->next = proc->breakpoints;
	proc->breakpoints = bp;

	return bp;
	}

	static void
	delete_breakpoint (struct breakpoint *todel)
	{
	struct process_info *proc = current_process ();
	struct breakpoint bp, *bp_link;

	bp = proc->breakpoints;
	bp_link = &proc->breakpoints;

	while (bp)
	{
	if (bp == todel)
	{
	*bp_link = bp->next;

	uninsert_breakpoint (bp);
	free (bp);
	return;
	}
	else
	{
	bp_link = &bp->next;
	bp = *bp_link;
	}
	}

	warning ("Could not find breakpoint in list.");
	}

	static struct breakpoint *
	find_breakpoint_at (CORE_ADDR where)
	{
	struct process_info *proc = current_process ();
	struct breakpoint *bp = proc->breakpoints;

	while (bp != NULL)
	{
	if (bp->pc == where)
	return bp;
	bp = bp->next;
	}

	return NULL;
	}

	void
	delete_breakpoint_at (CORE_ADDR addr)
	{
	struct breakpoint *bp = find_breakpoint_at (addr);
	if (bp != NULL)
	delete_breakpoint (bp);
	}

	void
	set_reinsert_breakpoint (CORE_ADDR stop_at)
	{
	struct breakpoint *bp;

	bp = set_breakpoint_at (stop_at, NULL);

	bp->type = reinsert_breakpoint;
	}

	void
	delete_reinsert_breakpoints (void)
	{
	struct process_info *proc = current_process ();
	struct breakpoint bp, *bp_link;

	bp = proc->breakpoints;
	bp_link = &proc->breakpoints;

	while (bp)
	{
	if (bp->type == reinsert_breakpoint)
	{
	*bp_link = bp->next;

	/* If something goes wrong, maybe this is a shared library
	breakpoint, and the shared library has been unmapped.
	Assume the breakpoint is gone anyway. */
	uninsert_breakpoint (bp);
	free (bp);

	bp = *bp_link;
	}
	else
	{
	bp_link = &bp->next;
	bp = *bp_link;
	}
	}
	}

	static void
	uninsert_breakpoint (struct breakpoint *bp)
	{
	if (bp->inserted)
	{
	int err;

	bp->inserted = 0;
	err = (*the_target->write_memory) (bp->pc, bp->old_data,
	breakpoint_len);
	if (err != 0)
	{
	bp->inserted = 1;

	if (debug_threads)
	fprintf (stderr,
	"Failed to uninsert raw breakpoint at 0x%s (%s).\n",
	paddress (bp->pc), strerror (err));
	}
	}
	}

	void
	uninsert_breakpoints_at (CORE_ADDR pc)
	{
	struct breakpoint *bp;

	bp = find_breakpoint_at (pc);
	if (bp == NULL)
	{
	/* This can happen when we remove all breakpoints while handling
	a step-over. */
	if (debug_threads)
	fprintf (stderr,
	"Could not find breakpoint at 0x%s "
	"in list (uninserting).\n",
	paddress (pc));
	return;
	}

	if (bp->inserted)
	uninsert_breakpoint (bp);
	}

	static void
	reinsert_raw_breakpoint (struct breakpoint *bp)
	{
	int err;

	if (bp->inserted)
	error ("Breakpoint already inserted at reinsert time.");

	err = (*the_target->write_memory) (bp->pc, breakpoint_data,
	breakpoint_len);
	if (err == 0)
	bp->inserted = 1;
	else if (debug_threads)
	fprintf (stderr,
	"Failed to reinsert breakpoint at 0x%s (%s).\n",
	paddress (bp->pc), strerror (err));
	}

	void
	reinsert_breakpoints_at (CORE_ADDR pc)
	{
	struct breakpoint *bp;

	bp = find_breakpoint_at (pc);
	if (bp == NULL)
	{
	/* This can happen when we remove all breakpoints while handling
	a step-over. */
	if (debug_threads)
	fprintf (stderr,
	"Could not find breakpoint at 0x%s "
	"in list (reinserting).\n",
	paddress (pc));
	return;
	}

	reinsert_raw_breakpoint (bp);
	}

	void
	check_breakpoints (CORE_ADDR stop_pc)
	{
	struct process_info *proc = current_process ();
	struct breakpoint bp, *bp_link;

	bp = proc->breakpoints;
	bp_link = &proc->breakpoints;

	while (bp)
	{
	if (bp->pc == stop_pc)
	{
	if (!bp->inserted)
	{
	warning ("Hit a removed breakpoint?");
	return;
	}

	if (bp->handler != NULL && (*bp->handler) (stop_pc))
	{
	*bp_link = bp->next;

	delete_breakpoint (bp);

	bp = *bp_link;
	continue;
	}
	}

	bp_link = &bp->next;
	bp = *bp_link;
	}
	}

	void
	set_breakpoint_data (const unsigned char *bp_data, int bp_len)
	{
	breakpoint_data = bp_data;
	breakpoint_len = bp_len;
	}

	int
	breakpoint_here (CORE_ADDR addr)
	{
	struct process_info *proc = current_process ();
	struct breakpoint *bp;

	for (bp = proc->breakpoints; bp != NULL; bp = bp->next)
	if (bp->pc == addr)
	return 1;

	return 0;
	}

	int
	breakpoint_inserted_here (CORE_ADDR addr)
	{
	struct process_info *proc = current_process ();
	struct breakpoint *bp;

	for (bp = proc->breakpoints; bp != NULL; bp = bp->next)
	if (bp->pc == addr && bp->inserted)
	return 1;

	return 0;
	}

	void
	check_mem_read (CORE_ADDR mem_addr, unsigned char *buf, int mem_len)
	{
	struct process_info *proc = current_process ();
	struct breakpoint *bp = proc->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, unsigned char *buf, int mem_len)
	{
	struct process_info *proc = current_process ();
	struct breakpoint *bp = proc->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->inserted)
	memcpy (buf + buf_offset, breakpoint_data + copy_offset, copy_len);
	}
	}

	/* Delete all breakpoints, and un-insert them from the inferior. */

	void
	delete_all_breakpoints (void)
	{
	struct process_info *proc = current_process ();

	while (proc->breakpoints)
	delete_breakpoint (proc->breakpoints);
	}

	/* Release all breakpoints, but do not try to un-insert them from the
	inferior. */

	void
	free_all_breakpoints (struct process_info *proc)
	{
	struct breakpoint *bp;

	while (proc->breakpoints)
	{
	bp = proc->breakpoints;
	proc->breakpoints = bp->next;
	free (bp);
	}
	}