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/* Memory breakpoint operations for the remote server for GDB.
   Copyright (C) 2002, 2003, 2005, 2007, 2008 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
 
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.  If it returns 1,
     the breakpoint will be deleted; 0, it will be reinserted for
     another round.  */
  int (*handler) (CORE_ADDR);
};
 
struct breakpoint *breakpoints;
 
void
set_breakpoint_at (CORE_ADDR where, int (*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;
}
 
void
delete_breakpoint_at (CORE_ADDR addr)
{
  struct breakpoint *bp = find_breakpoint_at (addr);
  if (bp != NULL)
    delete_breakpoint (bp);
}
 
static int
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;
  return 1;
}
 
void
reinsert_breakpoint_by_bp (CORE_ADDR stop_pc, CORE_ADDR stop_at)
{
  struct breakpoint *bp, *orig_bp;
 
  orig_bp = find_breakpoint_at (stop_pc);
  if (orig_bp == NULL)
    error ("Could not find original breakpoint in list.");
 
  set_breakpoint_at (stop_at, reinsert_breakpoint_handler);
 
  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;
    }
 
  if ((*bp->handler) (bp->pc))
    {
      delete_breakpoint (bp);
      return 2;
    }
  else
    return 1;
}
 
void
set_breakpoint_data (const unsigned char *bp_data, int bp_len)
{
  breakpoint_data = bp_data;
  breakpoint_len = bp_len;
}
 
void
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
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);
    }
}
 
/* Delete all breakpoints.  */
 
void
delete_all_breakpoints (void)
{
  while (breakpoints)
    delete_breakpoint (breakpoints);
}

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[/] [openrisc/] [trunk/] [gnu-src/] [gdb-6.8/] [gdb/] [gdbserver/] [mem-break.c] - Blame information for rev 455

Line No.	Rev	Author	Line
1	24	jeremybenn	`/* Memory breakpoint operations for the remote server for GDB.`
2			`Copyright (C) 2002, 2003, 2005, 2007, 2008 Free Software Foundation, Inc.`
3
4			`Contributed by MontaVista Software.`
5
6			`This file is part of GDB.`
7
8			`This program is free software; you can redistribute it and/or modify`
9			`it under the terms of the GNU General Public License as published by`
10			`the Free Software Foundation; either version 3 of the License, or`
11			`(at your option) any later version.`
12
13			`This program is distributed in the hope that it will be useful,`
14			`but WITHOUT ANY WARRANTY; without even the implied warranty of`
15			`MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the`
16			`GNU General Public License for more details.`
17
18			`You should have received a copy of the GNU General Public License`
19			`along with this program. If not, see <http://www.gnu.org/licenses/>. */`
20
21			`#include "server.h"`
22
23			`const unsigned char *breakpoint_data;`
24			`int breakpoint_len;`
25
26			`#define MAX_BREAKPOINT_LEN 8`
27
28			`struct breakpoint`
29			`{`
30			`struct breakpoint *next;`
31			`CORE_ADDR pc;`
32			`unsigned char old_data[MAX_BREAKPOINT_LEN];`
33
34			`/* Non-zero iff we are stepping over this breakpoint. */`
35			`int reinserting;`
36
37			`/* Non-NULL iff this breakpoint was inserted to step over`
38			`another one. Points to the other breakpoint (which is also`
39			`in the next chain somewhere). /`
40			`struct breakpoint *breakpoint_to_reinsert;`
41
42			`/* Function to call when we hit this breakpoint. If it returns 1,`
43			`the breakpoint will be deleted; 0, it will be reinserted for`
44			`another round. */`
45			`int (*handler) (CORE_ADDR);`
46			`};`
47
48			`struct breakpoint *breakpoints;`
49
50			`void`
51			`set_breakpoint_at (CORE_ADDR where, int (*handler) (CORE_ADDR))`
52			`{`
53			`struct breakpoint *bp;`
54
55			`if (breakpoint_data == NULL)`
56			`error ("Target does not support breakpoints.");`
57
58			`bp = malloc (sizeof (struct breakpoint));`
59			`memset (bp, 0, sizeof (struct breakpoint));`
60
61			`(*the_target->read_memory) (where, bp->old_data,`
62			`breakpoint_len);`
63			`(*the_target->write_memory) (where, breakpoint_data,`
64			`breakpoint_len);`
65
66			`bp->pc = where;`
67			`bp->handler = handler;`
68
69			`bp->next = breakpoints;`
70			`breakpoints = bp;`
71			`}`
72
73			`static void`
74			`delete_breakpoint (struct breakpoint *bp)`
75			`{`
76			`struct breakpoint *cur;`
77
78			`if (breakpoints == bp)`
79			`{`
80			`breakpoints = bp->next;`
81			`(*the_target->write_memory) (bp->pc, bp->old_data,`
82			`breakpoint_len);`
83			`free (bp);`
84			`return;`
85			`}`
86			`cur = breakpoints;`
87			`while (cur->next)`
88			`{`
89			`if (cur->next == bp)`
90			`{`
91			`cur->next = bp->next;`
92			`(*the_target->write_memory) (bp->pc, bp->old_data,`
93			`breakpoint_len);`
94			`free (bp);`
95			`return;`
96			`}`
97			`}`
98			`warning ("Could not find breakpoint in list.");`
99			`}`
100
101			`static struct breakpoint *`
102			`find_breakpoint_at (CORE_ADDR where)`
103			`{`
104			`struct breakpoint *bp = breakpoints;`
105
106			`while (bp != NULL)`
107			`{`
108			`if (bp->pc == where)`
109			`return bp;`
110			`bp = bp->next;`
111			`}`
112
113			`return NULL;`
114			`}`
115
116			`void`
117			`delete_breakpoint_at (CORE_ADDR addr)`
118			`{`
119			`struct breakpoint *bp = find_breakpoint_at (addr);`
120			`if (bp != NULL)`
121			`delete_breakpoint (bp);`
122			`}`
123
124			`static int`
125			`reinsert_breakpoint_handler (CORE_ADDR stop_pc)`
126			`{`
127			`struct breakpoint stop_bp, orig_bp;`
128
129			`stop_bp = find_breakpoint_at (stop_pc);`
130			`if (stop_bp == NULL)`
131			`error ("lost the stopping breakpoint.");`
132
133			`orig_bp = stop_bp->breakpoint_to_reinsert;`
134			`if (orig_bp == NULL)`
135			`error ("no breakpoint to reinsert");`
136
137			`(*the_target->write_memory) (orig_bp->pc, breakpoint_data,`
138			`breakpoint_len);`
139			`orig_bp->reinserting = 0;`
140			`return 1;`
141			`}`
142
143			`void`
144			`reinsert_breakpoint_by_bp (CORE_ADDR stop_pc, CORE_ADDR stop_at)`
145			`{`
146			`struct breakpoint bp, orig_bp;`
147
148			`orig_bp = find_breakpoint_at (stop_pc);`
149			`if (orig_bp == NULL)`
150			`error ("Could not find original breakpoint in list.");`
151
152			`set_breakpoint_at (stop_at, reinsert_breakpoint_handler);`
153
154			`bp = find_breakpoint_at (stop_at);`
155			`if (bp == NULL)`
156			`error ("Could not find breakpoint in list (reinserting by breakpoint).");`
157			`bp->breakpoint_to_reinsert = orig_bp;`
158
159			`(*the_target->write_memory) (orig_bp->pc, orig_bp->old_data,`
160			`breakpoint_len);`
161			`orig_bp->reinserting = 1;`
162			`}`
163
164			`void`
165			`uninsert_breakpoint (CORE_ADDR stopped_at)`
166			`{`
167			`struct breakpoint *bp;`
168
169			`bp = find_breakpoint_at (stopped_at);`
170			`if (bp == NULL)`
171			`error ("Could not find breakpoint in list (uninserting).");`
172
173			`(*the_target->write_memory) (bp->pc, bp->old_data,`
174			`breakpoint_len);`
175			`bp->reinserting = 1;`
176			`}`
177
178			`void`
179			`reinsert_breakpoint (CORE_ADDR stopped_at)`
180			`{`
181			`struct breakpoint *bp;`
182
183			`bp = find_breakpoint_at (stopped_at);`
184			`if (bp == NULL)`
185			`error ("Could not find breakpoint in list (uninserting).");`
186			`if (! bp->reinserting)`
187			`error ("Breakpoint already inserted at reinsert time.");`
188
189			`(*the_target->write_memory) (bp->pc, breakpoint_data,`
190			`breakpoint_len);`
191			`bp->reinserting = 0;`
192			`}`
193
194			`int`
195			`check_breakpoints (CORE_ADDR stop_pc)`
196			`{`
197			`struct breakpoint *bp;`
198
199			`bp = find_breakpoint_at (stop_pc);`
200			`if (bp == NULL)`
201			`return 0;`
202			`if (bp->reinserting)`
203			`{`
204			`warning ("Hit a removed breakpoint?");`
205			`return 0;`
206			`}`
207
208			`if ((*bp->handler) (bp->pc))`
209			`{`
210			`delete_breakpoint (bp);`
211			`return 2;`
212			`}`
213			`else`
214			`return 1;`
215			`}`
216
217			`void`
218			`set_breakpoint_data (const unsigned char *bp_data, int bp_len)`
219			`{`
220			`breakpoint_data = bp_data;`
221			`breakpoint_len = bp_len;`
222			`}`
223
224			`void`
225			`check_mem_read (CORE_ADDR mem_addr, unsigned char *buf, int mem_len)`
226			`{`
227			`struct breakpoint *bp = breakpoints;`
228			`CORE_ADDR mem_end = mem_addr + mem_len;`
229
230			`for (; bp != NULL; bp = bp->next)`
231			`{`
232			`CORE_ADDR bp_end = bp->pc + breakpoint_len;`
233			`CORE_ADDR start, end;`
234			`int copy_offset, copy_len, buf_offset;`
235
236			`if (mem_addr >= bp_end)`
237			`continue;`
238			`if (bp->pc >= mem_end)`
239			`continue;`
240
241			`start = bp->pc;`
242			`if (mem_addr > start)`
243			`start = mem_addr;`
244
245			`end = bp_end;`
246			`if (end > mem_end)`
247			`end = mem_end;`
248
249			`copy_len = end - start;`
250			`copy_offset = start - bp->pc;`
251			`buf_offset = start - mem_addr;`
252
253			`memcpy (buf + buf_offset, bp->old_data + copy_offset, copy_len);`
254			`}`
255			`}`
256
257			`void`
258			`check_mem_write (CORE_ADDR mem_addr, unsigned char *buf, int mem_len)`
259			`{`
260			`struct breakpoint *bp = breakpoints;`
261			`CORE_ADDR mem_end = mem_addr + mem_len;`
262
263			`for (; bp != NULL; bp = bp->next)`
264			`{`
265			`CORE_ADDR bp_end = bp->pc + breakpoint_len;`
266			`CORE_ADDR start, end;`
267			`int copy_offset, copy_len, buf_offset;`
268
269			`if (mem_addr >= bp_end)`
270			`continue;`
271			`if (bp->pc >= mem_end)`
272			`continue;`
273
274			`start = bp->pc;`
275			`if (mem_addr > start)`
276			`start = mem_addr;`
277
278			`end = bp_end;`
279			`if (end > mem_end)`
280			`end = mem_end;`
281
282			`copy_len = end - start;`
283			`copy_offset = start - bp->pc;`
284			`buf_offset = start - mem_addr;`
285
286			`memcpy (bp->old_data + copy_offset, buf + buf_offset, copy_len);`
287			`if (bp->reinserting == 0)`
288			`memcpy (buf + buf_offset, breakpoint_data + copy_offset, copy_len);`
289			`}`
290			`}`
291
292			`/* Delete all breakpoints. */`
293
294			`void`
295			`delete_all_breakpoints (void)`
296			`{`
297			`while (breakpoints)`
298			`delete_breakpoint (breakpoints);`
299			`}`