Commit | Line | Data |
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28e7fd62 | 1 | /* Copyright (C) 2009-2013 Free Software Foundation, Inc. |
8ed54b31 JB |
2 | |
3 | This file is part of GDB. | |
4 | ||
5 | This program is free software; you can redistribute it and/or modify | |
6 | it under the terms of the GNU General Public License as published by | |
7 | the Free Software Foundation; either version 3 of the License, or | |
8 | (at your option) any later version. | |
9 | ||
10 | This program is distributed in the hope that it will be useful, | |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | GNU General Public License for more details. | |
14 | ||
15 | You should have received a copy of the GNU General Public License | |
16 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ | |
17 | ||
18 | #include "server.h" | |
19 | #include "target.h" | |
20 | #include "lynx-low.h" | |
21 | ||
22 | #include <limits.h> | |
1adfc54d | 23 | #include <sys/ptrace.h> |
8ed54b31 JB |
24 | #include <sys/piddef.h> /* Provides PIDGET, TIDGET, BUILDPID, etc. */ |
25 | #include <unistd.h> | |
26 | #include <sys/ioctl.h> | |
27 | #include <sys/types.h> | |
8bdce1ff | 28 | #include "gdb_wait.h" |
8ed54b31 JB |
29 | #include <signal.h> |
30 | ||
31 | int using_threads = 1; | |
32 | ||
3aee8918 PA |
33 | const struct target_desc *lynx_tdesc; |
34 | ||
d631c5a7 JB |
35 | /* Per-process private data. */ |
36 | ||
37 | struct process_info_private | |
38 | { | |
39 | /* The PTID obtained from the last wait performed on this process. | |
40 | Initialized to null_ptid until the first wait is performed. */ | |
41 | ptid_t last_wait_event_ptid; | |
42 | }; | |
43 | ||
8ed54b31 JB |
44 | /* Print a debug trace on standard output if debug_threads is set. */ |
45 | ||
46 | static void | |
47 | lynx_debug (char *string, ...) | |
48 | { | |
49 | va_list args; | |
50 | ||
51 | if (!debug_threads) | |
52 | return; | |
53 | ||
54 | va_start (args, string); | |
55 | fprintf (stderr, "DEBUG(lynx): "); | |
56 | vfprintf (stderr, string, args); | |
57 | fprintf (stderr, "\n"); | |
58 | va_end (args); | |
59 | } | |
60 | ||
61 | /* Build a ptid_t given a PID and a LynxOS TID. */ | |
62 | ||
63 | static ptid_t | |
64 | lynx_ptid_build (int pid, long tid) | |
65 | { | |
66 | /* brobecker/2010-06-21: It looks like the LWP field in ptids | |
67 | should be distinct for each thread (see write_ptid where it | |
68 | writes the thread ID from the LWP). So instead of storing | |
69 | the LynxOS tid in the tid field of the ptid, we store it in | |
70 | the lwp field. */ | |
71 | return ptid_build (pid, tid, 0); | |
72 | } | |
73 | ||
74 | /* Return the process ID of the given PTID. | |
75 | ||
76 | This function has little reason to exist, it's just a wrapper around | |
77 | ptid_get_pid. But since we have a getter function for the lynxos | |
78 | ptid, it feels cleaner to have a getter for the pid as well. */ | |
79 | ||
80 | static int | |
81 | lynx_ptid_get_pid (ptid_t ptid) | |
82 | { | |
83 | return ptid_get_pid (ptid); | |
84 | } | |
85 | ||
86 | /* Return the LynxOS tid of the given PTID. */ | |
87 | ||
88 | static long | |
89 | lynx_ptid_get_tid (ptid_t ptid) | |
90 | { | |
91 | /* See lynx_ptid_build: The LynxOS tid is stored inside the lwp field | |
92 | of the ptid. */ | |
93 | return ptid_get_lwp (ptid); | |
94 | } | |
95 | ||
96 | /* For a given PTID, return the associated PID as known by the LynxOS | |
97 | ptrace layer. */ | |
98 | ||
99 | static int | |
100 | lynx_ptrace_pid_from_ptid (ptid_t ptid) | |
101 | { | |
102 | return BUILDPID (lynx_ptid_get_pid (ptid), lynx_ptid_get_tid (ptid)); | |
103 | } | |
104 | ||
105 | /* Return a string image of the ptrace REQUEST number. */ | |
106 | ||
107 | static char * | |
108 | ptrace_request_to_str (int request) | |
109 | { | |
4039cf45 | 110 | #define CASE(X) case X: return #X |
8ed54b31 JB |
111 | switch (request) |
112 | { | |
4039cf45 JB |
113 | CASE(PTRACE_TRACEME); |
114 | CASE(PTRACE_PEEKTEXT); | |
115 | CASE(PTRACE_PEEKDATA); | |
116 | CASE(PTRACE_PEEKUSER); | |
117 | CASE(PTRACE_POKETEXT); | |
118 | CASE(PTRACE_POKEDATA); | |
119 | CASE(PTRACE_POKEUSER); | |
120 | CASE(PTRACE_CONT); | |
121 | CASE(PTRACE_KILL); | |
122 | CASE(PTRACE_SINGLESTEP); | |
123 | CASE(PTRACE_ATTACH); | |
124 | CASE(PTRACE_DETACH); | |
125 | CASE(PTRACE_GETREGS); | |
126 | CASE(PTRACE_SETREGS); | |
127 | CASE(PTRACE_GETFPREGS); | |
128 | CASE(PTRACE_SETFPREGS); | |
129 | CASE(PTRACE_READDATA); | |
130 | CASE(PTRACE_WRITEDATA); | |
131 | CASE(PTRACE_READTEXT); | |
132 | CASE(PTRACE_WRITETEXT); | |
133 | CASE(PTRACE_GETFPAREGS); | |
134 | CASE(PTRACE_SETFPAREGS); | |
135 | CASE(PTRACE_GETWINDOW); | |
136 | CASE(PTRACE_SETWINDOW); | |
137 | CASE(PTRACE_SYSCALL); | |
138 | CASE(PTRACE_DUMPCORE); | |
139 | CASE(PTRACE_SETWRBKPT); | |
140 | CASE(PTRACE_SETACBKPT); | |
141 | CASE(PTRACE_CLRBKPT); | |
142 | CASE(PTRACE_GET_UCODE); | |
8ed54b31 | 143 | #ifdef PT_READ_GPR |
4039cf45 | 144 | CASE(PT_READ_GPR); |
8ed54b31 JB |
145 | #endif |
146 | #ifdef PT_WRITE_GPR | |
4039cf45 | 147 | CASE(PT_WRITE_GPR); |
8ed54b31 JB |
148 | #endif |
149 | #ifdef PT_READ_FPR | |
4039cf45 | 150 | CASE(PT_READ_FPR); |
8ed54b31 JB |
151 | #endif |
152 | #ifdef PT_WRITE_FPR | |
4039cf45 | 153 | CASE(PT_WRITE_FPR); |
8ed54b31 | 154 | #endif |
8ed54b31 | 155 | #ifdef PT_READ_VPR |
4039cf45 | 156 | CASE(PT_READ_VPR); |
8ed54b31 JB |
157 | #endif |
158 | #ifdef PT_WRITE_VPR | |
4039cf45 | 159 | CASE(PT_WRITE_VPR); |
8ed54b31 JB |
160 | #endif |
161 | #ifdef PTRACE_PEEKUSP | |
4039cf45 | 162 | CASE(PTRACE_PEEKUSP); |
8ed54b31 JB |
163 | #endif |
164 | #ifdef PTRACE_POKEUSP | |
4039cf45 | 165 | CASE(PTRACE_POKEUSP); |
8ed54b31 | 166 | #endif |
4039cf45 JB |
167 | CASE(PTRACE_PEEKTHREAD); |
168 | CASE(PTRACE_THREADUSER); | |
169 | CASE(PTRACE_FPREAD); | |
170 | CASE(PTRACE_FPWRITE); | |
171 | CASE(PTRACE_SETSIG); | |
172 | CASE(PTRACE_CONT_ONE); | |
173 | CASE(PTRACE_KILL_ONE); | |
174 | CASE(PTRACE_SINGLESTEP_ONE); | |
175 | CASE(PTRACE_GETLOADINFO); | |
176 | CASE(PTRACE_GETTRACESIG); | |
78cbc024 | 177 | #ifdef PTRACE_GETTHREADLIST |
4039cf45 | 178 | CASE(PTRACE_GETTHREADLIST); |
78cbc024 | 179 | #endif |
8ed54b31 | 180 | } |
4039cf45 JB |
181 | #undef CASE |
182 | ||
8ed54b31 JB |
183 | return "<unknown-request>"; |
184 | } | |
185 | ||
186 | /* A wrapper around ptrace that allows us to print debug traces of | |
187 | ptrace calls if debug traces are activated. */ | |
188 | ||
189 | static int | |
190 | lynx_ptrace (int request, ptid_t ptid, int addr, int data, int addr2) | |
191 | { | |
192 | int result; | |
193 | const int pid = lynx_ptrace_pid_from_ptid (ptid); | |
194 | int saved_errno; | |
195 | ||
196 | if (debug_threads) | |
197 | fprintf (stderr, "PTRACE (%s, pid=%d(pid=%d, tid=%d), addr=0x%x, " | |
198 | "data=0x%x, addr2=0x%x)", | |
199 | ptrace_request_to_str (request), pid, PIDGET (pid), TIDGET (pid), | |
200 | addr, data, addr2); | |
201 | result = ptrace (request, pid, addr, data, addr2); | |
202 | saved_errno = errno; | |
203 | if (debug_threads) | |
204 | fprintf (stderr, " -> %d (=0x%x)\n", result, result); | |
205 | ||
206 | errno = saved_errno; | |
207 | return result; | |
208 | } | |
209 | ||
d631c5a7 JB |
210 | /* Call add_process with the given parameters, and initializes |
211 | the process' private data. */ | |
212 | ||
213 | static struct process_info * | |
214 | lynx_add_process (int pid, int attached) | |
215 | { | |
216 | struct process_info *proc; | |
217 | ||
218 | proc = add_process (pid, attached); | |
3aee8918 | 219 | proc->tdesc = lynx_tdesc; |
d631c5a7 JB |
220 | proc->private = xcalloc (1, sizeof (*proc->private)); |
221 | proc->private->last_wait_event_ptid = null_ptid; | |
222 | ||
223 | return proc; | |
224 | } | |
225 | ||
8ed54b31 JB |
226 | /* Implement the create_inferior method of the target_ops vector. */ |
227 | ||
228 | static int | |
229 | lynx_create_inferior (char *program, char **allargs) | |
230 | { | |
8ed54b31 JB |
231 | int pid; |
232 | ||
233 | lynx_debug ("lynx_create_inferior ()"); | |
234 | ||
235 | pid = fork (); | |
236 | if (pid < 0) | |
237 | perror_with_name ("fork"); | |
238 | ||
239 | if (pid == 0) | |
240 | { | |
241 | int pgrp; | |
242 | ||
243 | /* Switch child to its own process group so that signals won't | |
244 | directly affect gdbserver. */ | |
245 | pgrp = getpid(); | |
246 | setpgid (0, pgrp); | |
247 | ioctl (0, TIOCSPGRP, &pgrp); | |
248 | lynx_ptrace (PTRACE_TRACEME, null_ptid, 0, 0, 0); | |
249 | execv (program, allargs); | |
250 | fprintf (stderr, "Cannot exec %s: %s.\n", program, strerror (errno)); | |
251 | fflush (stderr); | |
252 | _exit (0177); | |
253 | } | |
254 | ||
d631c5a7 | 255 | lynx_add_process (pid, 0); |
8ed54b31 JB |
256 | /* Do not add the process thread just yet, as we do not know its tid. |
257 | We will add it later, during the wait for the STOP event corresponding | |
258 | to the lynx_ptrace (PTRACE_TRACEME) call above. */ | |
259 | return pid; | |
260 | } | |
261 | ||
262 | /* Implement the attach target_ops method. */ | |
263 | ||
264 | static int | |
265 | lynx_attach (unsigned long pid) | |
266 | { | |
8ed54b31 JB |
267 | ptid_t ptid = lynx_ptid_build (pid, 0); |
268 | ||
269 | if (lynx_ptrace (PTRACE_ATTACH, ptid, 0, 0, 0) != 0) | |
270 | error ("Cannot attach to process %lu: %s (%d)\n", pid, | |
271 | strerror (errno), errno); | |
272 | ||
d631c5a7 | 273 | lynx_add_process (pid, 1); |
8ed54b31 JB |
274 | add_thread (ptid, NULL); |
275 | ||
276 | return 0; | |
277 | } | |
278 | ||
279 | /* Implement the resume target_ops method. */ | |
280 | ||
281 | static void | |
282 | lynx_resume (struct thread_resume *resume_info, size_t n) | |
283 | { | |
8ed54b31 | 284 | /* FIXME: Assume for now that n == 1. */ |
3f6e77ef | 285 | ptid_t ptid = resume_info[0].thread; |
8ed54b31 JB |
286 | const int request = (resume_info[0].kind == resume_step |
287 | ? PTRACE_SINGLESTEP : PTRACE_CONT); | |
288 | const int signal = resume_info[0].sig; | |
8ed54b31 | 289 | |
58794e1a | 290 | /* If given a minus_one_ptid, then try using the current_process' |
d631c5a7 JB |
291 | private->last_wait_event_ptid. On most LynxOS versions, |
292 | using any of the process' thread works well enough, but | |
293 | LynxOS 178 is a little more sensitive, and triggers some | |
294 | unexpected signals (Eg SIG61) when we resume the inferior | |
295 | using a different thread. */ | |
296 | if (ptid_equal (ptid, minus_one_ptid)) | |
297 | ptid = current_process()->private->last_wait_event_ptid; | |
298 | ||
58794e1a JB |
299 | /* The ptid might still be minus_one_ptid; this can happen between |
300 | the moment we create the inferior or attach to a process, and | |
301 | the moment we resume its execution for the first time. It is | |
302 | fine to use the current_inferior's ptid in those cases. */ | |
3f6e77ef JB |
303 | if (ptid_equal (ptid, minus_one_ptid)) |
304 | ptid = thread_to_gdb_id (current_inferior); | |
305 | ||
8ed54b31 | 306 | regcache_invalidate (); |
9044dee2 JB |
307 | |
308 | errno = 0; | |
3f6e77ef | 309 | lynx_ptrace (request, ptid, 1, signal, 0); |
9044dee2 JB |
310 | if (errno) |
311 | perror_with_name ("ptrace"); | |
8ed54b31 JB |
312 | } |
313 | ||
314 | /* Resume the execution of the given PTID. */ | |
315 | ||
316 | static void | |
317 | lynx_continue (ptid_t ptid) | |
318 | { | |
319 | struct thread_resume resume_info; | |
320 | ||
321 | resume_info.thread = ptid; | |
322 | resume_info.kind = resume_continue; | |
323 | resume_info.sig = 0; | |
324 | ||
325 | lynx_resume (&resume_info, 1); | |
326 | } | |
327 | ||
8ed54b31 JB |
328 | /* A wrapper around waitpid that handles the various idiosyncrasies |
329 | of LynxOS' waitpid. */ | |
330 | ||
331 | static int | |
332 | lynx_waitpid (int pid, int *stat_loc) | |
333 | { | |
334 | int ret = 0; | |
335 | ||
336 | while (1) | |
337 | { | |
338 | ret = waitpid (pid, stat_loc, WNOHANG); | |
339 | if (ret < 0) | |
340 | { | |
341 | /* An ECHILD error is not indicative of a real problem. | |
342 | It happens for instance while waiting for the inferior | |
343 | to stop after attaching to it. */ | |
344 | if (errno != ECHILD) | |
345 | perror_with_name ("waitpid (WNOHANG)"); | |
346 | } | |
347 | if (ret > 0) | |
348 | break; | |
349 | /* No event with WNOHANG. See if there is one with WUNTRACED. */ | |
350 | ret = waitpid (pid, stat_loc, WNOHANG | WUNTRACED); | |
351 | if (ret < 0) | |
352 | { | |
353 | /* An ECHILD error is not indicative of a real problem. | |
354 | It happens for instance while waiting for the inferior | |
355 | to stop after attaching to it. */ | |
356 | if (errno != ECHILD) | |
357 | perror_with_name ("waitpid (WNOHANG|WUNTRACED)"); | |
358 | } | |
359 | if (ret > 0) | |
360 | break; | |
361 | usleep (1000); | |
362 | } | |
363 | return ret; | |
364 | } | |
365 | ||
366 | /* Implement the wait target_ops method. */ | |
367 | ||
368 | static ptid_t | |
369 | lynx_wait_1 (ptid_t ptid, struct target_waitstatus *status, int options) | |
370 | { | |
371 | int pid; | |
372 | int ret; | |
373 | int wstat; | |
374 | ptid_t new_ptid; | |
375 | ||
376 | if (ptid_equal (ptid, minus_one_ptid)) | |
377 | pid = lynx_ptid_get_pid (thread_to_gdb_id (current_inferior)); | |
378 | else | |
379 | pid = BUILDPID (lynx_ptid_get_pid (ptid), lynx_ptid_get_tid (ptid)); | |
380 | ||
381 | retry: | |
382 | ||
383 | ret = lynx_waitpid (pid, &wstat); | |
384 | new_ptid = lynx_ptid_build (ret, ((union wait *) &wstat)->w_tid); | |
d631c5a7 | 385 | find_process_pid (ret)->private->last_wait_event_ptid = new_ptid; |
8ed54b31 JB |
386 | |
387 | /* If this is a new thread, then add it now. The reason why we do | |
388 | this here instead of when handling new-thread events is because | |
389 | we need to add the thread associated to the "main" thread - even | |
390 | for non-threaded applications where the new-thread events are not | |
391 | generated. */ | |
392 | if (!find_thread_ptid (new_ptid)) | |
8b93d60f JB |
393 | { |
394 | lynx_debug ("New thread: (pid = %d, tid = %d)", | |
395 | lynx_ptid_get_pid (new_ptid), lynx_ptid_get_tid (new_ptid)); | |
396 | add_thread (new_ptid, NULL); | |
397 | } | |
8ed54b31 JB |
398 | |
399 | if (WIFSTOPPED (wstat)) | |
400 | { | |
401 | status->kind = TARGET_WAITKIND_STOPPED; | |
2ea28649 | 402 | status->value.integer = gdb_signal_from_host (WSTOPSIG (wstat)); |
8ed54b31 JB |
403 | lynx_debug ("process stopped with signal: %d", |
404 | status->value.integer); | |
405 | } | |
406 | else if (WIFEXITED (wstat)) | |
407 | { | |
408 | status->kind = TARGET_WAITKIND_EXITED; | |
409 | status->value.integer = WEXITSTATUS (wstat); | |
410 | lynx_debug ("process exited with code: %d", status->value.integer); | |
411 | } | |
412 | else if (WIFSIGNALED (wstat)) | |
413 | { | |
414 | status->kind = TARGET_WAITKIND_SIGNALLED; | |
2ea28649 | 415 | status->value.integer = gdb_signal_from_host (WTERMSIG (wstat)); |
8ed54b31 JB |
416 | lynx_debug ("process terminated with code: %d", |
417 | status->value.integer); | |
418 | } | |
419 | else | |
420 | { | |
421 | /* Not sure what happened if we get here, or whether we can | |
422 | in fact get here. But if we do, handle the event the best | |
423 | we can. */ | |
424 | status->kind = TARGET_WAITKIND_STOPPED; | |
2ea28649 | 425 | status->value.integer = gdb_signal_from_host (0); |
8ed54b31 JB |
426 | lynx_debug ("unknown event ????"); |
427 | } | |
428 | ||
429 | /* SIGTRAP events are generated for situations other than single-step/ | |
430 | breakpoint events (Eg. new-thread events). Handle those other types | |
431 | of events, and resume the execution if necessary. */ | |
432 | if (status->kind == TARGET_WAITKIND_STOPPED | |
a493e3e2 | 433 | && status->value.integer == GDB_SIGNAL_TRAP) |
8ed54b31 JB |
434 | { |
435 | const int realsig = lynx_ptrace (PTRACE_GETTRACESIG, new_ptid, 0, 0, 0); | |
436 | ||
437 | lynx_debug ("(realsig = %d)", realsig); | |
438 | switch (realsig) | |
439 | { | |
440 | case SIGNEWTHREAD: | |
441 | /* We just added the new thread above. No need to do anything | |
442 | further. Just resume the execution again. */ | |
3f6e77ef | 443 | lynx_continue (new_ptid); |
8ed54b31 JB |
444 | goto retry; |
445 | ||
446 | case SIGTHREADEXIT: | |
447 | remove_thread (find_thread_ptid (new_ptid)); | |
3f6e77ef | 448 | lynx_continue (new_ptid); |
8ed54b31 JB |
449 | goto retry; |
450 | } | |
451 | } | |
452 | ||
453 | return new_ptid; | |
454 | } | |
455 | ||
456 | /* A wrapper around lynx_wait_1 that also prints debug traces when | |
457 | such debug traces have been activated. */ | |
458 | ||
459 | static ptid_t | |
460 | lynx_wait (ptid_t ptid, struct target_waitstatus *status, int options) | |
461 | { | |
462 | ptid_t new_ptid; | |
463 | ||
464 | lynx_debug ("lynx_wait (pid = %d, tid = %ld)", | |
465 | lynx_ptid_get_pid (ptid), lynx_ptid_get_tid (ptid)); | |
466 | new_ptid = lynx_wait_1 (ptid, status, options); | |
467 | lynx_debug (" -> (pid=%d, tid=%ld, status->kind = %d)", | |
468 | lynx_ptid_get_pid (new_ptid), lynx_ptid_get_tid (new_ptid), | |
469 | status->kind); | |
470 | return new_ptid; | |
471 | } | |
472 | ||
473 | /* Implement the kill target_ops method. */ | |
474 | ||
475 | static int | |
476 | lynx_kill (int pid) | |
477 | { | |
478 | ptid_t ptid = lynx_ptid_build (pid, 0); | |
479 | struct target_waitstatus status; | |
480 | struct process_info *process; | |
481 | ||
482 | process = find_process_pid (pid); | |
483 | if (process == NULL) | |
484 | return -1; | |
485 | ||
486 | lynx_ptrace (PTRACE_KILL, ptid, 0, 0, 0); | |
487 | lynx_wait (ptid, &status, 0); | |
488 | the_target->mourn (process); | |
489 | return 0; | |
490 | } | |
491 | ||
492 | /* Implement the detach target_ops method. */ | |
493 | ||
494 | static int | |
495 | lynx_detach (int pid) | |
496 | { | |
497 | ptid_t ptid = lynx_ptid_build (pid, 0); | |
498 | struct process_info *process; | |
499 | ||
500 | process = find_process_pid (pid); | |
501 | if (process == NULL) | |
502 | return -1; | |
503 | ||
504 | lynx_ptrace (PTRACE_DETACH, ptid, 0, 0, 0); | |
505 | the_target->mourn (process); | |
506 | return 0; | |
507 | } | |
508 | ||
509 | /* Implement the mourn target_ops method. */ | |
510 | ||
511 | static void | |
512 | lynx_mourn (struct process_info *proc) | |
513 | { | |
d631c5a7 JB |
514 | /* Free our private data. */ |
515 | free (proc->private); | |
516 | proc->private = NULL; | |
517 | ||
518 | clear_inferiors (); | |
8ed54b31 JB |
519 | } |
520 | ||
521 | /* Implement the join target_ops method. */ | |
522 | ||
523 | static void | |
524 | lynx_join (int pid) | |
525 | { | |
526 | /* The PTRACE_DETACH is sufficient to detach from the process. | |
527 | So no need to do anything extra. */ | |
528 | } | |
529 | ||
530 | /* Implement the thread_alive target_ops method. */ | |
531 | ||
532 | static int | |
533 | lynx_thread_alive (ptid_t ptid) | |
534 | { | |
535 | /* The list of threads is updated at the end of each wait, so it | |
536 | should be up to date. No need to re-fetch it. */ | |
537 | return (find_thread_ptid (ptid) != NULL); | |
538 | } | |
539 | ||
540 | /* Implement the fetch_registers target_ops method. */ | |
541 | ||
542 | static void | |
543 | lynx_fetch_registers (struct regcache *regcache, int regno) | |
544 | { | |
545 | struct lynx_regset_info *regset = lynx_target_regsets; | |
546 | ptid_t inferior_ptid = thread_to_gdb_id (current_inferior); | |
547 | ||
548 | lynx_debug ("lynx_fetch_registers (regno = %d)", regno); | |
549 | ||
550 | while (regset->size >= 0) | |
551 | { | |
552 | char *buf; | |
553 | int res; | |
554 | ||
555 | buf = xmalloc (regset->size); | |
556 | res = lynx_ptrace (regset->get_request, inferior_ptid, (int) buf, 0, 0); | |
557 | if (res < 0) | |
558 | perror ("ptrace"); | |
559 | regset->store_function (regcache, buf); | |
560 | free (buf); | |
561 | regset++; | |
562 | } | |
563 | } | |
564 | ||
565 | /* Implement the store_registers target_ops method. */ | |
566 | ||
567 | static void | |
568 | lynx_store_registers (struct regcache *regcache, int regno) | |
569 | { | |
570 | struct lynx_regset_info *regset = lynx_target_regsets; | |
571 | ptid_t inferior_ptid = thread_to_gdb_id (current_inferior); | |
572 | ||
573 | lynx_debug ("lynx_store_registers (regno = %d)", regno); | |
574 | ||
575 | while (regset->size >= 0) | |
576 | { | |
577 | char *buf; | |
578 | int res; | |
579 | ||
580 | buf = xmalloc (regset->size); | |
581 | res = lynx_ptrace (regset->get_request, inferior_ptid, (int) buf, 0, 0); | |
582 | if (res == 0) | |
583 | { | |
584 | /* Then overlay our cached registers on that. */ | |
585 | regset->fill_function (regcache, buf); | |
586 | /* Only now do we write the register set. */ | |
587 | res = lynx_ptrace (regset->set_request, inferior_ptid, (int) buf, | |
588 | 0, 0); | |
589 | } | |
590 | if (res < 0) | |
591 | perror ("ptrace"); | |
592 | free (buf); | |
593 | regset++; | |
594 | } | |
595 | } | |
596 | ||
597 | /* Implement the read_memory target_ops method. */ | |
598 | ||
599 | static int | |
600 | lynx_read_memory (CORE_ADDR memaddr, unsigned char *myaddr, int len) | |
601 | { | |
602 | /* On LynxOS, memory reads needs to be performed in chunks the size | |
603 | of int types, and they should also be aligned accordingly. */ | |
604 | int buf; | |
605 | const int xfer_size = sizeof (buf); | |
606 | CORE_ADDR addr = memaddr & -(CORE_ADDR) xfer_size; | |
607 | ptid_t inferior_ptid = thread_to_gdb_id (current_inferior); | |
608 | ||
609 | while (addr < memaddr + len) | |
610 | { | |
611 | int skip = 0; | |
612 | int truncate = 0; | |
613 | ||
614 | errno = 0; | |
615 | if (addr < memaddr) | |
616 | skip = memaddr - addr; | |
617 | if (addr + xfer_size > memaddr + len) | |
618 | truncate = addr + xfer_size - memaddr - len; | |
619 | buf = lynx_ptrace (PTRACE_PEEKTEXT, inferior_ptid, addr, 0, 0); | |
620 | if (errno) | |
621 | return errno; | |
622 | memcpy (myaddr + (addr - memaddr) + skip, (gdb_byte *) &buf + skip, | |
623 | xfer_size - skip - truncate); | |
624 | addr += xfer_size; | |
625 | } | |
626 | ||
627 | return 0; | |
628 | } | |
629 | ||
630 | /* Implement the write_memory target_ops method. */ | |
631 | ||
632 | static int | |
633 | lynx_write_memory (CORE_ADDR memaddr, const unsigned char *myaddr, int len) | |
634 | { | |
635 | /* On LynxOS, memory writes needs to be performed in chunks the size | |
636 | of int types, and they should also be aligned accordingly. */ | |
637 | int buf; | |
638 | const int xfer_size = sizeof (buf); | |
639 | CORE_ADDR addr = memaddr & -(CORE_ADDR) xfer_size; | |
640 | ptid_t inferior_ptid = thread_to_gdb_id (current_inferior); | |
641 | ||
642 | while (addr < memaddr + len) | |
643 | { | |
644 | int skip = 0; | |
645 | int truncate = 0; | |
646 | ||
647 | if (addr < memaddr) | |
648 | skip = memaddr - addr; | |
649 | if (addr + xfer_size > memaddr + len) | |
650 | truncate = addr + xfer_size - memaddr - len; | |
651 | if (skip > 0 || truncate > 0) | |
652 | /* We need to read the memory at this address in order to preserve | |
653 | the data that we are not overwriting. */ | |
654 | lynx_read_memory (addr, (unsigned char *) &buf, xfer_size); | |
655 | if (errno) | |
656 | return errno; | |
657 | memcpy ((gdb_byte *) &buf + skip, myaddr + (addr - memaddr) + skip, | |
658 | xfer_size - skip - truncate); | |
659 | errno = 0; | |
660 | lynx_ptrace (PTRACE_POKETEXT, inferior_ptid, addr, buf, 0); | |
661 | if (errno) | |
662 | return errno; | |
663 | addr += xfer_size; | |
664 | } | |
665 | ||
666 | return 0; | |
667 | } | |
668 | ||
669 | /* Implement the kill_request target_ops method. */ | |
670 | ||
671 | static void | |
672 | lynx_request_interrupt (void) | |
673 | { | |
674 | ptid_t inferior_ptid = thread_to_gdb_id (current_inferior); | |
675 | ||
676 | kill (lynx_ptid_get_pid (inferior_ptid), SIGINT); | |
677 | } | |
678 | ||
679 | /* The LynxOS target_ops vector. */ | |
680 | ||
681 | static struct target_ops lynx_target_ops = { | |
682 | lynx_create_inferior, | |
683 | lynx_attach, | |
684 | lynx_kill, | |
685 | lynx_detach, | |
686 | lynx_mourn, | |
687 | lynx_join, | |
688 | lynx_thread_alive, | |
689 | lynx_resume, | |
690 | lynx_wait, | |
691 | lynx_fetch_registers, | |
692 | lynx_store_registers, | |
693 | NULL, /* prepare_to_access_memory */ | |
694 | NULL, /* done_accessing_memory */ | |
695 | lynx_read_memory, | |
696 | lynx_write_memory, | |
697 | NULL, /* look_up_symbols */ | |
698 | lynx_request_interrupt, | |
699 | NULL, /* read_auxv */ | |
700 | NULL, /* insert_point */ | |
701 | NULL, /* remove_point */ | |
702 | NULL, /* stopped_by_watchpoint */ | |
703 | NULL, /* stopped_data_address */ | |
704 | NULL, /* read_offsets */ | |
705 | NULL, /* get_tls_address */ | |
706 | NULL, /* qxfer_spu */ | |
707 | NULL, /* hostio_last_error */ | |
708 | NULL, /* qxfer_osdata */ | |
709 | NULL, /* qxfer_siginfo */ | |
710 | NULL, /* supports_non_stop */ | |
711 | NULL, /* async */ | |
712 | NULL, /* start_non_stop */ | |
713 | NULL, /* supports_multi_process */ | |
714 | NULL, /* handle_monitor_command */ | |
715 | }; | |
716 | ||
717 | void | |
718 | initialize_low (void) | |
719 | { | |
720 | set_target_ops (&lynx_target_ops); | |
721 | the_low_target.arch_setup (); | |
722 | } | |
723 |