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[/] [openrisc/] [trunk/] [gnu-src/] [gdb-7.1/] [gdb/] [gdbserver/] [mem-break.c] - Blame information for rev 227

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/* 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
 
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);
};
 
void
set_breakpoint_at (CORE_ADDR where, int (*handler) (CORE_ADDR))
{
  struct process_info *proc = current_process ();
  struct breakpoint *bp;
 
  if (breakpoint_data == NULL)
    error ("Target does not support breakpoints.");
 
  bp = xmalloc (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 = proc->breakpoints;
  proc->breakpoints = bp;
}
 
static void
delete_breakpoint (struct breakpoint *bp)
{
  struct process_info *proc = current_process ();
  struct breakpoint *cur;
 
  if (proc->breakpoints == bp)
    {
      proc->breakpoints = bp->next;
      (*the_target->write_memory) (bp->pc, bp->old_data,
                                   breakpoint_len);
      free (bp);
      return;
    }
  cur = proc->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 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);
}
 
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 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->reinserting == 0)
        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);
    }
}

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[/] [openrisc/] [trunk/] [gnu-src/] [gdb-7.1/] [gdb/] [gdbserver/] [mem-break.c] - Blame information for rev 227

Line No.	Rev	Author	Line
1	227	jeremybenn	`/* Memory breakpoint operations for the remote server for GDB.`
2			`Copyright (C) 2002, 2003, 2005, 2007, 2008, 2009, 2010`
3			`Free Software Foundation, Inc.`
4
5			`Contributed by MontaVista Software.`
6
7			`This file is part of GDB.`
8
9			`This program is free software; you can redistribute it and/or modify`
10			`it under the terms of the GNU General Public License as published by`
11			`the Free Software Foundation; either version 3 of the License, or`
12			`(at your option) any later version.`
13
14			`This program is distributed in the hope that it will be useful,`
15			`but WITHOUT ANY WARRANTY; without even the implied warranty of`
16			`MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the`
17			`GNU General Public License for more details.`
18
19			`You should have received a copy of the GNU General Public License`
20			`along with this program. If not, see <http://www.gnu.org/licenses/>. */`
21
22			`#include "server.h"`
23
24			`const unsigned char *breakpoint_data;`
25			`int breakpoint_len;`
26
27			`#define MAX_BREAKPOINT_LEN 8`
28
29			`struct breakpoint`
30			`{`
31			`struct breakpoint *next;`
32			`CORE_ADDR pc;`
33			`unsigned char old_data[MAX_BREAKPOINT_LEN];`
34
35			`/* Non-zero iff we are stepping over this breakpoint. */`
36			`int reinserting;`
37
38			`/* Non-NULL iff this breakpoint was inserted to step over`
39			`another one. Points to the other breakpoint (which is also`
40			`in the next chain somewhere). /`
41			`struct breakpoint *breakpoint_to_reinsert;`
42
43			`/* Function to call when we hit this breakpoint. If it returns 1,`
44			`the breakpoint will be deleted; 0, it will be reinserted for`
45			`another round. */`
46			`int (*handler) (CORE_ADDR);`
47			`};`
48
49			`void`
50			`set_breakpoint_at (CORE_ADDR where, int (*handler) (CORE_ADDR))`
51			`{`
52			`struct process_info *proc = current_process ();`
53			`struct breakpoint *bp;`
54
55			`if (breakpoint_data == NULL)`
56			`error ("Target does not support breakpoints.");`
57
58			`bp = xmalloc (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 = proc->breakpoints;`
70			`proc->breakpoints = bp;`
71			`}`
72
73			`static void`
74			`delete_breakpoint (struct breakpoint *bp)`
75			`{`
76			`struct process_info *proc = current_process ();`
77			`struct breakpoint *cur;`
78
79			`if (proc->breakpoints == bp)`
80			`{`
81			`proc->breakpoints = bp->next;`
82			`(*the_target->write_memory) (bp->pc, bp->old_data,`
83			`breakpoint_len);`
84			`free (bp);`
85			`return;`
86			`}`
87			`cur = proc->breakpoints;`
88			`while (cur->next)`
89			`{`
90			`if (cur->next == bp)`
91			`{`
92			`cur->next = bp->next;`
93			`(*the_target->write_memory) (bp->pc, bp->old_data,`
94			`breakpoint_len);`
95			`free (bp);`
96			`return;`
97			`}`
98			`}`
99			`warning ("Could not find breakpoint in list.");`
100			`}`
101
102			`static struct breakpoint *`
103			`find_breakpoint_at (CORE_ADDR where)`
104			`{`
105			`struct process_info *proc = current_process ();`
106			`struct breakpoint *bp = proc->breakpoints;`
107
108			`while (bp != NULL)`
109			`{`
110			`if (bp->pc == where)`
111			`return bp;`
112			`bp = bp->next;`
113			`}`
114
115			`return NULL;`
116			`}`
117
118			`void`
119			`delete_breakpoint_at (CORE_ADDR addr)`
120			`{`
121			`struct breakpoint *bp = find_breakpoint_at (addr);`
122			`if (bp != NULL)`
123			`delete_breakpoint (bp);`
124			`}`
125
126			`static int`
127			`reinsert_breakpoint_handler (CORE_ADDR stop_pc)`
128			`{`
129			`struct breakpoint stop_bp, orig_bp;`
130
131			`stop_bp = find_breakpoint_at (stop_pc);`
132			`if (stop_bp == NULL)`
133			`error ("lost the stopping breakpoint.");`
134
135			`orig_bp = stop_bp->breakpoint_to_reinsert;`
136			`if (orig_bp == NULL)`
137			`error ("no breakpoint to reinsert");`
138
139			`(*the_target->write_memory) (orig_bp->pc, breakpoint_data,`
140			`breakpoint_len);`
141			`orig_bp->reinserting = 0;`
142			`return 1;`
143			`}`
144
145			`void`
146			`reinsert_breakpoint_by_bp (CORE_ADDR stop_pc, CORE_ADDR stop_at)`
147			`{`
148			`struct breakpoint bp, orig_bp;`
149
150			`orig_bp = find_breakpoint_at (stop_pc);`
151			`if (orig_bp == NULL)`
152			`error ("Could not find original breakpoint in list.");`
153
154			`set_breakpoint_at (stop_at, reinsert_breakpoint_handler);`
155
156			`bp = find_breakpoint_at (stop_at);`
157			`if (bp == NULL)`
158			`error ("Could not find breakpoint in list (reinserting by breakpoint).");`
159			`bp->breakpoint_to_reinsert = orig_bp;`
160
161			`(*the_target->write_memory) (orig_bp->pc, orig_bp->old_data,`
162			`breakpoint_len);`
163			`orig_bp->reinserting = 1;`
164			`}`
165
166			`void`
167			`uninsert_breakpoint (CORE_ADDR stopped_at)`
168			`{`
169			`struct breakpoint *bp;`
170
171			`bp = find_breakpoint_at (stopped_at);`
172			`if (bp == NULL)`
173			`error ("Could not find breakpoint in list (uninserting).");`
174
175			`(*the_target->write_memory) (bp->pc, bp->old_data,`
176			`breakpoint_len);`
177			`bp->reinserting = 1;`
178			`}`
179
180			`void`
181			`reinsert_breakpoint (CORE_ADDR stopped_at)`
182			`{`
183			`struct breakpoint *bp;`
184
185			`bp = find_breakpoint_at (stopped_at);`
186			`if (bp == NULL)`
187			`error ("Could not find breakpoint in list (uninserting).");`
188			`if (! bp->reinserting)`
189			`error ("Breakpoint already inserted at reinsert time.");`
190
191			`(*the_target->write_memory) (bp->pc, breakpoint_data,`
192			`breakpoint_len);`
193			`bp->reinserting = 0;`
194			`}`
195
196			`int`
197			`check_breakpoints (CORE_ADDR stop_pc)`
198			`{`
199			`struct breakpoint *bp;`
200
201			`bp = find_breakpoint_at (stop_pc);`
202			`if (bp == NULL)`
203			`return 0;`
204			`if (bp->reinserting)`
205			`{`
206			`warning ("Hit a removed breakpoint?");`
207			`return 0;`
208			`}`
209
210			`if ((*bp->handler) (bp->pc))`
211			`{`
212			`delete_breakpoint (bp);`
213			`return 2;`
214			`}`
215			`else`
216			`return 1;`
217			`}`
218
219			`void`
220			`set_breakpoint_data (const unsigned char *bp_data, int bp_len)`
221			`{`
222			`breakpoint_data = bp_data;`
223			`breakpoint_len = bp_len;`
224			`}`
225
226			`void`
227			`check_mem_read (CORE_ADDR mem_addr, unsigned char *buf, int mem_len)`
228			`{`
229			`struct process_info *proc = current_process ();`
230			`struct breakpoint *bp = proc->breakpoints;`
231			`CORE_ADDR mem_end = mem_addr + mem_len;`
232
233			`for (; bp != NULL; bp = bp->next)`
234			`{`
235			`CORE_ADDR bp_end = bp->pc + breakpoint_len;`
236			`CORE_ADDR start, end;`
237			`int copy_offset, copy_len, buf_offset;`
238
239			`if (mem_addr >= bp_end)`
240			`continue;`
241			`if (bp->pc >= mem_end)`
242			`continue;`
243
244			`start = bp->pc;`
245			`if (mem_addr > start)`
246			`start = mem_addr;`
247
248			`end = bp_end;`
249			`if (end > mem_end)`
250			`end = mem_end;`
251
252			`copy_len = end - start;`
253			`copy_offset = start - bp->pc;`
254			`buf_offset = start - mem_addr;`
255
256			`memcpy (buf + buf_offset, bp->old_data + copy_offset, copy_len);`
257			`}`
258			`}`
259
260			`void`
261			`check_mem_write (CORE_ADDR mem_addr, unsigned char *buf, int mem_len)`
262			`{`
263			`struct process_info *proc = current_process ();`
264			`struct breakpoint *bp = proc->breakpoints;`
265			`CORE_ADDR mem_end = mem_addr + mem_len;`
266
267			`for (; bp != NULL; bp = bp->next)`
268			`{`
269			`CORE_ADDR bp_end = bp->pc + breakpoint_len;`
270			`CORE_ADDR start, end;`
271			`int copy_offset, copy_len, buf_offset;`
272
273			`if (mem_addr >= bp_end)`
274			`continue;`
275			`if (bp->pc >= mem_end)`
276			`continue;`
277
278			`start = bp->pc;`
279			`if (mem_addr > start)`
280			`start = mem_addr;`
281
282			`end = bp_end;`
283			`if (end > mem_end)`
284			`end = mem_end;`
285
286			`copy_len = end - start;`
287			`copy_offset = start - bp->pc;`
288			`buf_offset = start - mem_addr;`
289
290			`memcpy (bp->old_data + copy_offset, buf + buf_offset, copy_len);`
291			`if (bp->reinserting == 0)`
292			`memcpy (buf + buf_offset, breakpoint_data + copy_offset, copy_len);`
293			`}`
294			`}`
295
296			`/* Delete all breakpoints, and un-insert them from the inferior. */`
297
298			`void`
299			`delete_all_breakpoints (void)`
300			`{`
301			`struct process_info *proc = current_process ();`
302
303			`while (proc->breakpoints)`
304			`delete_breakpoint (proc->breakpoints);`
305			`}`
306
307			`/* Release all breakpoints, but do not try to un-insert them from the`
308			`inferior. */`
309
310			`void`
311			`free_all_breakpoints (struct process_info *proc)`
312			`{`
313			`struct breakpoint *bp;`
314
315			`while (proc->breakpoints)`
316			`{`
317			`bp = proc->breakpoints;`
318			`proc->breakpoints = bp->next;`
319			`free (bp);`
320			`}`
321			`}`