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[/] [openrisc/] [trunk/] [rtos/] [rtems/] [c/] [src/] [librdbg/] [src/] [ptrace.c] - Blame information for rev 30

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1 30 unneback 
/*
2 
 **************************************************************************
3 
 *
4 
 * Component =
5 
 *
6 
 * Synopsis  =   rkdb/rkdb.c
7 
 *
8 
 * $Id: ptrace.c,v 1.2 2001-09-27 12:02:01 chris Exp $
9 
 *
10 
 **************************************************************************
11 
 */
12 
 
13 
#include <assert.h>
14 
#include <errno.h>
15 
#include <rdbg/rdbg.h>
16 
#include <rdbg/rdbg_f.h>
17 
#include <rdbg/servrpc.h>
18 
 
19 
extern rtems_id serializeSemId;
20 
extern rtems_id wakeupEventSemId;
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extern rtems_id eventTaskId;
22 
extern Exception_context *FirstCtx;
23 
extern Exception_context *LastCtx;
24 
extern CPU_Exception_frame SavedContext;
25 
extern unsigned int NbExceptCtx;
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extern unsigned int NbSerializedCtx;
27 
 
28 
 
29 
 
30 
/* --------------------------------------------------------------------
31 
   return a pointer to the Thread Control structure of the specified
32 
   Id
33 
   -------------------------------------------------------------------- */
34 
 
35 
Thread_Control *Thread_Get_RDBG (
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  Objects_Id           Id
37 
)
38 
{
39 
  unsigned index;
40 
 
41 
  if ( Id <_Objects_Information_table[OBJECTS_RTEMS_TASKS]->maximum_id &&
42 
       Id >_Objects_Information_table[OBJECTS_RTEMS_TASKS]->minimum_id) {
43 
 
44 
    index = Id - _Objects_Information_table[OBJECTS_RTEMS_TASKS]->minimum_id;
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    if ( _Objects_Information_table[OBJECTS_RTEMS_TASKS]->local_table[1+index] != NULL) {
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      return (Thread_Control *)(_Objects_Information_table[OBJECTS_RTEMS_TASKS]->local_table[1+index]);
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    }
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  }
49 
 
50 
  if ( Id <_Objects_Information_table[OBJECTS_POSIX_THREADS]->maximum_id &&
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       Id >_Objects_Information_table[OBJECTS_POSIX_THREADS]->minimum_id) {
52 
 
53 
    index = Id - _Objects_Information_table[OBJECTS_POSIX_THREADS]->minimum_id;
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    if ( _Objects_Information_table[OBJECTS_POSIX_THREADS]->local_table[1+index] != NULL)
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      return (Thread_Control *)(_Objects_Information_table[OBJECTS_POSIX_THREADS]->local_table[1+index]);
56 
  }
57 
 
58 
  return 0;
59 
 
60 
}
61 
 
62 
 
63 
/* --------------------------------------------------------------------
64 
   Memory read
65 
   -------------------------------------------------------------------- */
66 
 
67 
int
68 
safeMemRead(void *src, void *dest, int nbBytes){
69 
 
70 
  /*
71 
   * safe because if it generates an exception,
72 
   * it must return normally
73 
   * TBD
74 
   */
75 
 
76 
  memcpy(dest, src, nbBytes);
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  return 0;
78 
}
79 
 
80 
/* --------------------------------------------------------------------
81 
   Memory write
82 
   -------------------------------------------------------------------- */
83 
int
84 
safeMemWrite(void *src, void * dest, int nbBytes){
85 
 
86 
  /*
87 
   * safe because if it generates an exception,
88 
   * it must return normally
89 
   * TBD
90 
   */
91 
 
92 
  memcpy(dest, src, nbBytes);
93 
  return 0;
94 
}
95 
 
96 
/* --------------------------------------------------------------------
97 
   Ptrace
98 
   -------------------------------------------------------------------- */
99 
 
100 
int
101 
ptrace (int request, int pid, char* addr, int data, char* addr2)
102 
 {
103 
   int diag;
104 
   errno = 0 ;
105 
   if (pid != 1) {
106 
     errno = ESRCH;
107 
     return -1;
108 
   }
109 
   switch (request) {
110 
 
111 
   case RPT_SINGLESTEP:{
112 
     Exception_context *ctx;
113 
 
114 
     if (CannotRestart == 1){
115 
       setErrno(EIO);
116 
       return -1;
117 
     }
118 
 
119 
     if ((ctx = GetExceptCtx (currentTargetThread)) != NULL) {
120 
       Single_Step(ctx->ctx);
121 
       rtems_semaphore_release( ctx->semaphoreId );
122 
       return 0;
123 
     }
124 
     break;
125 
   }
126 
 
127 
   case RPT_PEEKTEXT:
128 
   case RPT_PEEKDATA: {
129 
     diag = safeMemRead(addr, &data, sizeof data);
130 
     if (diag == 0) return data;
131 
   mem_error:
132 
     return -1;
133 
   }
134 
 
135 
   case RPT_POKETEXT: {
136 
     diag = safeMemWrite(&data, addr, sizeof data);
137 
 
138 
     /*
139 
      * We must flush the INSTR and DATA cache to be sure the
140 
      * opcode modification is taken into account, because
141 
      * the breakpoint opcode is written via the data cache
142 
      * while execution code is fetched via the instruction
143 
      * cache
144 
      */
145 
 
146 
     if (diag == 0) {
147 
       copyback_data_cache_and_invalidate_instr_cache(addr, sizeof data);
148 
       return 0;
149 
     }
150 
     goto mem_error;
151 
   }
152 
   case RPT_POKEDATA: {
153 
     diag = safeMemWrite(&data, addr, sizeof data);
154 
     if (diag == 0) return 0;
155 
     goto mem_error;
156 
   }
157 
   case RPT_CONT: {
158 
     Exception_context *ctx;
159 
 
160 
     if (CannotRestart == 1){
161 
       setErrno (EIO);
162 
       return -1;
163 
     }
164 
 
165 
     ctx = GetExceptCtx (currentTargetThread);
166 
 
167 
     if (!isRdbgException(ctx)) {
168 
       CannotRestart = 1;
169 
       setErrno (EIO);
170 
       return -1;
171 
     }
172 
 
173 
     assert (data == 0);
174 
     assert (ExitForSingleStep == 0);
175 
 
176 
     rtems_semaphore_release( serializeSemId );
177 
 
178 
     if ((ctx = GetExceptCtx (currentTargetThread)) != NULL) {
179 
       rtems_semaphore_release( ctx->semaphoreId );
180 
     }
181 
     return 0;
182 
   }
183 
 
184 
   case RPT_ATTACH:
185 
     return 0;
186 
 
187 
   case RPT_DETACH:{
188 
     Exception_context *ctx;
189 
 
190 
     if (NbExceptCtx || NbSerializedCtx) {
191 
       ctx = FirstCtx;
192 
       rtems_task_delete(eventTaskId);
193 
       rtems_semaphore_delete(serializeSemId);
194 
       rtems_semaphore_delete(wakeupEventSemId);
195 
     }
196 
     return 0;
197 
   }
198 
 
199 
   case RPT_GETREGS:{
200 
     Exception_context *ctx;
201 
 
202 
     if ((ctx = GetExceptCtx (currentTargetThread)) != NULL) {
203 
       CtxToRegs (ctx->ctx, (xdr_regs*) addr);
204 
       return 0;
205 
     }
206 
     break;
207 
   }
208 
 
209 
   case RPT_SETREGS:{
210 
     Exception_context *ctx;
211 
 
212 
     if ((ctx = GetExceptCtx (currentTargetThread)) != NULL) {
213 
       RegsToCtx ((xdr_regs*) addr, ctx->ctx);
214 
       return 0;
215 
     }
216 
     break;
217 
   }
218 
 
219 
   case RPT_READTEXT:
220 
   case RPT_READDATA: {
221 
     diag = safeMemRead(addr, addr2, data);
222 
     if (diag == 0) return 0;
223 
     goto mem_error;
224 
   }
225 
   case RPT_WRITETEXT:
226 
   case RPT_WRITEDATA: {
227 
     diag = safeMemWrite(addr2, addr, data);
228 
     if (diag == 0) return 0;
229 
     goto mem_error;
230 
   }
231 
 
232 
   case RPT_GETTARGETTHREAD:
233 
     if (!NbExceptCtx) {
234 
       errno = EBUSY;
235 
       return -1;
236 
     }
237 
     return currentTargetThread;
238 
 
239 
   case RPT_SETTARGETTHREAD:
240 
     if (!NbExceptCtx) {
241 
       errno = EBUSY;
242 
       return -1;
243 
     }
244 
     currentTargetThread = data;
245 
     return 0;
246 
 
247 
   case RPT_GETTHREADNAME: {
248 
     return TgtGetThreadName (NULL, (unsigned)(data), (char *) addr);
249 
   }
250 
 
251 
   case RPT_THREADLIST: {
252 
     int count = TgtThreadList (NULL, (unsigned*) addr, UTHREAD_MAX
253 
                                * sizeof (unsigned));
254 
     if (count < 0) {
255 
       errno = EINVAL;
256 
       return -1;
257 
     }
258 
     return count;
259 
   }
260 
 
261 
   case RPT_SETTHREADREGS: {
262 
     Exception_context *ctx;
263 
     CPU_Exception_frame Ectx;
264 
     Thread_Control *thread;
265 
     rtems_id id;
266 
 
267 
     rtems_task_ident(RTEMS_SELF, RTEMS_SEARCH_ALL_NODES, &id);
268 
     if (data == (unsigned)id)
269 
       break;
270 
 
271 
     if ((ctx = GetExceptCtx (data)) != NULL) {
272 
       RegsToCtx ((xdr_regs*) addr, ctx->ctx);
273 
       return 0;
274 
     }
275 
     thread = Thread_Get_RDBG ((Objects_Id)(data));
276 
     if (thread != NULL) {
277 
       RegsToCtx ((xdr_regs*) addr, &Ectx);
278 
       set_ctx_thread (thread, &Ectx);
279 
       return 0;
280 
     }
281 
     break;
282 
   }
283 
 
284 
   case RPT_GETTHREADREGS: {
285 
     Exception_context *ctx;
286 
     CPU_Exception_frame Ectx;
287 
     Thread_Control *thread;
288 
     rtems_id id;
289 
 
290 
     rtems_task_ident(RTEMS_SELF, RTEMS_SEARCH_ALL_NODES, &id);
291 
     if (data == (unsigned)id){
292 
       justSaveContext = 1;
293 
       enterRdbg();
294 
       CtxToRegs (&(SavedContext), (xdr_regs*) addr);
295 
       return 0;
296 
     }
297 
 
298 
     if ((ctx = GetExceptCtx (data)) != NULL) {
299 
       CtxToRegs (ctx->ctx, (xdr_regs*) addr);
300 
       return 0;
301 
     }
302 
     thread = Thread_Get_RDBG ((Objects_Id)(data));
303 
     if (thread != NULL) {
304 
       get_ctx_thread (thread, &Ectx);
305 
       CtxToRegs (&Ectx, (xdr_regs*) addr);
306 
       return 0;
307 
     }
308 
     break;
309 
   }
310 
 
311 
   case RPT_KILL:
312 
     TotalReboot = 1;
313 
     return 0;
314 
 
315 
   case RPT_TRACEME:
316 
   case RPT_PEEKUSER:
317 
   case RPT_POKEUSER:
318 
   case RPT_GETFPREGS:
319 
   case RPT_SETFPREGS:
320 
   case RPT_GETFPAREGS:
321 
   case RPT_SETFPAREGS:
322 
   case RPT_SYSCALL:
323 
   case RPT_DUMPCORE:
324 
   case RPT_GETUCODE:
325 
   case RPT_THREADSUSPEND:
326 
   case RPT_THREADRESUME:
327 
   case RPT_SETTHREADNAME:
328 
   default:
329 
     break;
330 
   }
331 
   errno = EINVAL;
332 
   return -1;
333 
}

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