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1 | /* Low level interface for debugging AIX 4.3+ pthreads. |
2 | ||
3 | Copyright 1999, 2000, 2002 Free Software Foundation, Inc. | |
4 | Written by Nick Duffek <nsd@redhat.com>. | |
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 2 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, write to the Free Software | |
20 | Foundation, Inc., 59 Temple Place - Suite 330, | |
21 | Boston, MA 02111-1307, USA. */ | |
22 | ||
23 | ||
24 | /* This module uses the libpthdebug.a library provided by AIX 4.3+ for | |
25 | debugging pthread applications. | |
26 | ||
27 | Some name prefix conventions: | |
28 | pthdb_ provided by libpthdebug.a | |
29 | pdc_ callbacks that this module provides to libpthdebug.a | |
30 | pd_ variables or functions interfacing with libpthdebug.a | |
31 | ||
32 | libpthdebug peculiarities: | |
33 | ||
34 | - pthdb_ptid_pthread() is prototyped in <sys/pthdebug.h>, but it's not | |
35 | documented, and after several calls it stops working and causes other | |
36 | libpthdebug functions to fail. | |
37 | ||
38 | - pthdb_tid_pthread() doesn't always work after pthdb_session_update(), | |
39 | but it does work after cycling through all threads using | |
40 | pthdb_pthread(). | |
41 | ||
42 | */ | |
43 | ||
44 | #include "defs.h" | |
45 | #include "gdbthread.h" | |
46 | #include "target.h" | |
47 | #include "inferior.h" | |
48 | #include "regcache.h" | |
49 | ||
50 | #if 0 | |
51 | #include "coff/internal.h" /* for libcoff.h */ | |
52 | #include "bfd/libcoff.h" /* for xcoff_data */ | |
53 | #endif | |
54 | ||
55 | #include <procinfo.h> | |
56 | #include <sys/types.h> | |
57 | #include <sys/ptrace.h> | |
58 | #include <sys/reg.h> | |
59 | #if 0 | |
60 | #include <pthread.h> | |
61 | #endif | |
62 | #include <sched.h> | |
63 | #include <sys/pthdebug.h> | |
64 | ||
65 | /* Whether to emit debugging output. */ | |
66 | ||
67 | #define DEBUG 0 | |
68 | ||
69 | /* Default debugging output file, overridden by envvar UWTHR_DEBUG. */ | |
70 | ||
71 | #define DEBUG_FILE "/dev/tty" | |
72 | ||
73 | /* #if DEBUG, write string S to the debugging output channel. */ | |
74 | ||
75 | #if !DEBUG | |
76 | # define DBG(fmt_and_args) | |
77 | # define DBG2(fmt_and_args) | |
78 | #else | |
79 | # define DBG(fmt_and_args) dbg fmt_and_args | |
80 | # define DBG2(fmt_and_args) dbg fmt_and_args | |
81 | #endif | |
82 | ||
83 | /* in AIX 5.1, functions use pthdb_tid_t instead of tid_t */ | |
84 | #ifndef PTHDB_VERSION_3 | |
85 | #define pthdb_tid_t tid_t | |
86 | #endif | |
87 | ||
88 | /* Return whether to treat PID as a debuggable thread id. */ | |
89 | ||
90 | #define PD_TID(ptid) (pd_active && ptid_get_tid (ptid) != 0) | |
91 | ||
92 | /* Build a thread ptid. */ | |
93 | #define BUILD_THREAD(TID, PID) ptid_build (PID, 0, TID) | |
94 | ||
95 | /* Build and lwp ptid. */ | |
96 | #define BUILD_LWP(LWP, PID) MERGEPID (PID, LWP) | |
97 | ||
98 | /* Call error() with a message indicating that libpthdebug FUNC failed with | |
99 | STATUS. */ | |
100 | ||
101 | #define PD_ERROR(func, status) \ | |
102 | error ("aix-thread: %s returned %s", func, pd_status2str (status)) | |
103 | ||
104 | /* pthdb_user_t value that we pass to pthdb functions. 0 causes | |
105 | PTHDB_BAD_USER errors, so use 1. */ | |
106 | ||
107 | #define PD_USER 1 | |
108 | ||
109 | /* Success and failure values returned by pthdb callbacks. */ | |
110 | ||
111 | #define PDC_SUCCESS PTHDB_SUCCESS | |
112 | #define PDC_FAILURE PTHDB_CALLBACK | |
113 | ||
114 | /* Convert composite process/thread inferior_ptid to a process id, evaluate | |
115 | base_ops function CALL, and then restore inferior_ptid. */ | |
116 | ||
117 | #define CALL_BASE(call) \ | |
118 | do { \ | |
119 | struct cleanup *cleanup = save_inferior_ptid (); \ | |
120 | inferior_ptid = pid_to_ptid (PIDGET (inferior_ptid)); \ | |
121 | call; \ | |
122 | do_cleanups (cleanup); \ | |
123 | } while (0) | |
124 | ||
125 | /* Private data attached to each element in GDB's thread list. */ | |
126 | ||
127 | struct private_thread_info { | |
128 | pthdb_pthread_t pdtid; /* thread's libpthdebug id */ | |
129 | pthdb_tid_t tid; /* kernel thread id */ | |
130 | }; | |
131 | ||
132 | /* Information about a thread of which libpthdebug is aware. */ | |
133 | ||
134 | struct pd_thread { | |
135 | pthdb_pthread_t pdtid; | |
136 | pthread_t pthid; | |
137 | pthdb_tid_t tid; | |
138 | }; | |
139 | ||
140 | /* This module's target-specific operations, active while pd_able is true. */ | |
141 | ||
142 | static struct target_ops ops; | |
143 | ||
144 | /* Copy of the target over which ops is pushed. This is | |
145 | more convenient than a pointer to child_ops or core_ops, because | |
146 | they lack current_target's default callbacks. */ | |
147 | ||
148 | static struct target_ops base_ops; | |
149 | ||
150 | /* Address of the function that libpthread will call when libpthdebug is | |
151 | ready to be initialized. */ | |
152 | ||
153 | static CORE_ADDR pd_brk_addr; | |
154 | ||
155 | /* Whether the current application is debuggable by pthdb. */ | |
156 | ||
157 | static int pd_able = 0; | |
158 | ||
159 | /* Whether a threaded application is being debugged. */ | |
160 | ||
161 | static int pd_active = 0; | |
162 | ||
163 | /* Whether the current architecture is 64-bit. Only valid when pd_able is | |
164 | true. */ | |
165 | ||
166 | static int arch64; | |
167 | ||
168 | /* Saved pointer to previous owner of target_new_objfile_hook. */ | |
169 | ||
170 | static void (*target_new_objfile_chain)(struct objfile *); | |
171 | ||
172 | /* Forward declarations for pthdb callbacks. */ | |
173 | ||
174 | static int pdc_symbol_addrs (pthdb_user_t, pthdb_symbol_t *, int); | |
175 | static int pdc_read_data (pthdb_user_t, void *, pthdb_addr_t, size_t); | |
176 | static int pdc_write_data (pthdb_user_t, void *, pthdb_addr_t, size_t); | |
177 | static int pdc_read_regs (pthdb_user_t user, pthdb_tid_t tid, | |
178 | unsigned long long flags, pthdb_context_t *context); | |
179 | static int pdc_write_regs (pthdb_user_t user, pthdb_tid_t tid, | |
180 | unsigned long long flags, pthdb_context_t *context); | |
181 | static int pdc_alloc (pthdb_user_t, size_t, void **); | |
182 | static int pdc_realloc (pthdb_user_t, void *, size_t, void **); | |
183 | static int pdc_dealloc (pthdb_user_t, void *); | |
184 | ||
185 | /* pthdb callbacks. */ | |
186 | ||
187 | static pthdb_callbacks_t pd_callbacks = { | |
188 | pdc_symbol_addrs, | |
189 | pdc_read_data, | |
190 | pdc_write_data, | |
191 | pdc_read_regs, | |
192 | pdc_write_regs, | |
193 | pdc_alloc, | |
194 | pdc_realloc, | |
195 | pdc_dealloc, | |
196 | NULL | |
197 | }; | |
198 | ||
199 | /* Current pthdb session. */ | |
200 | ||
201 | static pthdb_session_t pd_session; | |
202 | ||
203 | #if DEBUG | |
204 | /* DBG() helper: if printf-style FMT is non-null, format it with args and | |
205 | display the result on the debugging output channel. */ | |
206 | ||
207 | static void | |
208 | dbg (char *fmt, ...) | |
209 | { | |
210 | static int fd = -1, len; | |
211 | va_list args; | |
212 | char buf[1024]; | |
213 | char *path; | |
214 | ||
215 | if (!fmt) | |
216 | return; | |
217 | ||
218 | if (fd < 0) | |
219 | { | |
220 | path = getenv ("UWTHR_DEBUG"); | |
221 | if (!path) | |
222 | path = DEBUG_FILE; | |
223 | if ((fd = open (path, O_WRONLY | O_CREAT | O_TRUNC, 0664)) < 0) | |
224 | error ("can't open %s\n", path); | |
225 | } | |
226 | ||
227 | va_start (args, fmt); | |
228 | vsprintf (buf, fmt, args); | |
229 | va_end (args); | |
230 | ||
231 | len = strlen (buf); | |
232 | buf[len] = '\n'; | |
233 | (void)write (fd, buf, len + 1); | |
234 | } | |
235 | #endif /* DEBUG */ | |
236 | ||
237 | /* Return a printable representation of pthdebug function return STATUS. */ | |
238 | ||
239 | static char * | |
240 | pd_status2str (int status) | |
241 | { | |
242 | switch (status) | |
243 | { | |
244 | case PTHDB_SUCCESS: return "SUCCESS"; | |
245 | case PTHDB_NOSYS: return "NOSYS"; | |
246 | case PTHDB_NOTSUP: return "NOTSUP"; | |
247 | case PTHDB_BAD_VERSION: return "BAD_VERSION"; | |
248 | case PTHDB_BAD_USER: return "BAD_USER"; | |
249 | case PTHDB_BAD_SESSION: return "BAD_SESSION"; | |
250 | case PTHDB_BAD_MODE: return "BAD_MODE"; | |
251 | case PTHDB_BAD_FLAGS: return "BAD_FLAGS"; | |
252 | case PTHDB_BAD_CALLBACK: return "BAD_CALLBACK"; | |
253 | case PTHDB_BAD_POINTER: return "BAD_POINTER"; | |
254 | case PTHDB_BAD_CMD: return "BAD_CMD"; | |
255 | case PTHDB_BAD_PTHREAD: return "BAD_PTHREAD"; | |
256 | case PTHDB_BAD_ATTR: return "BAD_ATTR"; | |
257 | case PTHDB_BAD_MUTEX: return "BAD_MUTEX"; | |
258 | case PTHDB_BAD_MUTEXATTR: return "BAD_MUTEXATTR"; | |
259 | case PTHDB_BAD_COND: return "BAD_COND"; | |
260 | case PTHDB_BAD_CONDATTR: return "BAD_CONDATTR"; | |
261 | case PTHDB_BAD_RWLOCK: return "BAD_RWLOCK"; | |
262 | case PTHDB_BAD_RWLOCKATTR: return "BAD_RWLOCKATTR"; | |
263 | case PTHDB_BAD_KEY: return "BAD_KEY"; | |
264 | case PTHDB_BAD_PTID: return "BAD_PTID"; | |
265 | case PTHDB_BAD_TID: return "BAD_TID"; | |
266 | case PTHDB_CALLBACK: return "CALLBACK"; | |
267 | case PTHDB_CONTEXT: return "CONTEXT"; | |
268 | case PTHDB_HELD: return "HELD"; | |
269 | case PTHDB_NOT_HELD: return "NOT_HELD"; | |
270 | case PTHDB_MEMORY: return "MEMORY"; | |
271 | case PTHDB_NOT_PTHREADED: return "NOT_PTHREADED"; | |
272 | case PTHDB_SYMBOL: return "SYMBOL"; | |
273 | case PTHDB_NOT_AVAIL: return "NOT_AVAIL"; | |
274 | case PTHDB_INTERNAL: return "INTERNAL"; | |
275 | default: return "UNKNOWN"; | |
276 | } | |
277 | } | |
278 | ||
279 | /* A call to ptrace(REQ, ID, ...) just returned RET. Check for exceptional | |
280 | conditions and either return nonlocally or else return 1 for success and 0 | |
281 | for failure. */ | |
282 | ||
283 | static int | |
284 | ptrace_check (int req, int id, int ret) | |
285 | { | |
286 | if (ret == 0 && !errno) | |
287 | return 1; | |
288 | ||
289 | /* According to ptrace(2), ptrace may fail with EPERM if "the Identifier | |
290 | parameter corresponds to a kernel thread which is stopped in kernel mode | |
291 | and whose computational state cannot be read or written." This happens | |
292 | quite often with register reads. */ | |
293 | ||
294 | switch (req) | |
295 | { | |
296 | case PTT_READ_GPRS: | |
297 | case PTT_READ_FPRS: | |
298 | case PTT_READ_SPRS: | |
299 | if (ret == -1 && errno == EPERM) | |
300 | goto strange; | |
301 | break; | |
302 | } | |
303 | error ("aix-thread: ptrace (%d, %d) returned %d (errno = %d %s)", | |
304 | req, id, ret, errno, strerror (errno)); | |
305 | ||
306 | strange: | |
307 | DBG2(("ptrace (%d, %d) = %d (errno = %d)", req, id, ret, errno)); | |
308 | return ret == -1 ? 0 : 1; | |
309 | } | |
310 | ||
311 | /* Call ptracex(REQ, ID, ADDR, DATA, BUF). Return success. */ | |
312 | ||
313 | static int | |
314 | ptrace64aix (int req, int id, long long addr, int data, int *buf) | |
315 | { | |
316 | errno = 0; | |
317 | return ptrace_check (req, id, ptracex (req, id, addr, data, buf)); | |
318 | } | |
319 | ||
320 | /* Call ptrace(REQ, ID, ADDR, DATA, BUF). Return success. */ | |
321 | ||
322 | static int | |
323 | ptrace32 (int req, int id, int *addr, int data, int *buf) | |
324 | { | |
325 | errno = 0; | |
326 | return ptrace_check (req, id, ptrace (req, id, (int *)addr, data, buf)); | |
327 | } | |
328 | ||
329 | /* If *PIDP is a composite process/thread id, convert it to a process id. */ | |
330 | ||
331 | static void | |
332 | pid_to_prc (ptid_t *ptidp) | |
333 | { | |
334 | ptid_t ptid; | |
335 | ||
336 | ptid = *ptidp; | |
337 | if (PD_TID (ptid)) | |
338 | *ptidp = pid_to_ptid (PIDGET (ptid)); | |
339 | } | |
340 | ||
341 | /* pthdb callback: for <i> from 0 to COUNT, set SYMBOLS[<i>].addr to the | |
342 | address of SYMBOLS[<i>].name. */ | |
343 | ||
344 | static int | |
345 | pdc_symbol_addrs (pthdb_user_t user, pthdb_symbol_t *symbols, int count) | |
346 | { | |
347 | struct minimal_symbol *ms; | |
348 | int i; | |
349 | char *name; | |
350 | ||
351 | DBG2(("pdc_symbol_addrs (user = %ld, symbols = 0x%x, count = %d)", | |
352 | user, symbols, count)); | |
353 | ||
354 | for (i = 0; i < count; i++) | |
355 | { | |
356 | name = symbols[i].name; | |
357 | DBG2((" symbols[%d].name = \"%s\"", i, name)); | |
358 | ||
359 | if (!*name) | |
360 | symbols[i].addr = 0; | |
361 | else | |
362 | { | |
363 | if (!(ms = lookup_minimal_symbol (name, NULL, NULL))) | |
364 | { | |
365 | DBG2((" returning PDC_FAILURE")); | |
366 | return PDC_FAILURE; | |
367 | } | |
368 | symbols[i].addr = SYMBOL_VALUE_ADDRESS (ms); | |
369 | } | |
370 | DBG2((" symbols[%d].addr = 0x%llx", i, symbols[i].addr)); | |
371 | } | |
372 | DBG2((" returning PDC_SUCCESS")); | |
373 | return PDC_SUCCESS; | |
374 | } | |
375 | ||
376 | /* Read registers call back function should be able to read the context */ | |
377 | /* information of a debuggee kernel thread from an active process or from */ | |
378 | /* a core file. The information should be formatted in context64 form for */ | |
379 | /* both 32-bit and 64-bit process. If successful return 0, else non-zero */ | |
380 | /* is returned. */ | |
381 | static int | |
382 | pdc_read_regs (pthdb_user_t user, | |
383 | pthdb_tid_t tid, | |
384 | unsigned long long flags, | |
385 | pthdb_context_t *context) | |
386 | { | |
387 | /* this function doesn't appear to be used, so we could probably just */ | |
388 | /* return 0 here. HOWEVER, if it is not defined, the OS will complain */ | |
389 | /* and several thread debug functions will fail. In case this is needed, */ | |
390 | /* I have implemented what I think it should do, however this code is */ | |
391 | /* untested. */ | |
392 | uint64_t gprs64[32]; | |
393 | uint32_t gprs32[32]; | |
394 | double fprs[32]; | |
395 | struct ptxsprs sprs64; | |
396 | struct ptsprs sprs32; | |
397 | ||
398 | DBG2(("pdc_read_regs tid=%d flags=%llx\n", (int)tid, flags)); | |
399 | ||
400 | /* General-purpose registers. */ | |
401 | if (flags & PTHDB_FLAG_GPRS) | |
402 | { | |
403 | if (arch64) | |
404 | { | |
405 | if (!ptrace64aix (PTT_READ_GPRS, tid, (unsigned long) gprs64, 0, NULL)) | |
406 | memset (gprs64, 0, sizeof (gprs64)); | |
407 | memcpy (context->gpr, gprs64, sizeof(gprs64)); | |
408 | } | |
409 | else | |
410 | { | |
411 | if (!ptrace32 (PTT_READ_GPRS, tid, gprs32, 0, NULL)) | |
412 | memset (gprs32, 0, sizeof (gprs32)); | |
413 | memcpy (context->gpr, gprs32, sizeof(gprs32)); | |
414 | } | |
415 | } | |
416 | ||
417 | /* Floating-point registers. */ | |
418 | if (flags & PTHDB_FLAG_FPRS) | |
419 | { | |
420 | if (!ptrace32 (PTT_READ_FPRS, tid, (int *) fprs, 0, NULL)) | |
421 | memset (fprs, 0, sizeof (fprs)); | |
422 | memcpy (context->fpr, fprs, sizeof(fprs)); | |
423 | } | |
424 | ||
425 | /* Special-purpose registers. */ | |
426 | if (flags & PTHDB_FLAG_SPRS) | |
427 | { | |
428 | if (arch64) | |
429 | { | |
430 | if (!ptrace64aix (PTT_READ_SPRS, tid, (unsigned long) &sprs64, 0, NULL)) | |
431 | memset (&sprs64, 0, sizeof (sprs64)); | |
432 | memcpy (&context->msr, &sprs64, sizeof(sprs64)); | |
433 | } | |
434 | else | |
435 | { | |
436 | if (!ptrace32 (PTT_READ_SPRS, tid, (int *) &sprs32, 0, NULL)) | |
437 | memset (&sprs32, 0, sizeof (sprs32)); | |
438 | memcpy (&context->msr, &sprs32, sizeof(sprs32)); | |
439 | } | |
440 | } | |
441 | return 0; | |
442 | } | |
443 | ||
444 | /* Write register function should be able to write requested context */ | |
445 | /* information to specified debuggee's kernel thread id. If successful */ | |
446 | /* return 0, else non-zero is returned. */ | |
447 | static int | |
448 | pdc_write_regs (pthdb_user_t user, | |
449 | pthdb_tid_t tid, | |
450 | unsigned long long flags, | |
451 | pthdb_context_t *context) | |
452 | { | |
453 | /* this function doesn't appear to be used, so we could probably just */ | |
454 | /* return 0 here. HOWEVER, if it is not defined, the OS will complain */ | |
455 | /* and several thread debug functions will fail. In case this is needed, */ | |
456 | /* I have implemented what I think it should do, however this code is */ | |
457 | /* untested. */ | |
458 | ||
459 | DBG2(("pdc_write_regs tid=%d flags=%llx\n", (int)tid, flags)); | |
460 | ||
461 | /* General-purpose registers. */ | |
462 | if (flags & PTHDB_FLAG_GPRS) | |
463 | { | |
464 | if (arch64) | |
465 | ptrace64aix (PTT_WRITE_GPRS, tid, (unsigned long)context->gpr, 0, NULL); | |
466 | else | |
467 | ptrace32 (PTT_WRITE_GPRS, tid, (int *)context->gpr, 0, NULL); | |
468 | } | |
469 | ||
470 | /* Floating-point registers. */ | |
471 | if (flags & PTHDB_FLAG_FPRS) | |
472 | { | |
473 | ptrace32 (PTT_WRITE_FPRS, tid, (int *)context->fpr, 0, NULL); | |
474 | } | |
475 | ||
476 | /* Special-purpose registers. */ | |
477 | if (flags & PTHDB_FLAG_SPRS) | |
478 | { | |
479 | if (arch64) | |
480 | { | |
481 | ptrace64aix (PTT_WRITE_SPRS, tid, (unsigned long) &context->msr, 0, NULL); | |
482 | } | |
483 | else | |
484 | { | |
485 | ptrace32 (PTT_WRITE_SPRS, tid, (int *)&context->msr, 0, NULL); | |
486 | } | |
487 | } | |
488 | return 0; | |
489 | } | |
490 | ||
491 | /* pthdb callback: read LEN bytes from process ADDR into BUF. */ | |
492 | ||
493 | static int | |
494 | pdc_read_data (pthdb_user_t user, void *buf, pthdb_addr_t addr, size_t len) | |
495 | { | |
496 | int status, ret; | |
497 | ||
498 | DBG2(("pdc_read_data (user = %ld, buf = 0x%x, addr = 0x%llx, len = %d)", | |
499 | user, buf, addr, len)); | |
500 | ||
501 | status = target_read_memory (addr, buf, len); | |
502 | ret = status == 0 ? PDC_SUCCESS : PDC_FAILURE; | |
503 | ||
504 | DBG2((" status=%d, returning %s", status, pd_status2str (ret))); | |
505 | return ret; | |
506 | } | |
507 | ||
508 | /* pthdb callback: write LEN bytes from BUF to process ADDR. */ | |
509 | ||
510 | static int | |
511 | pdc_write_data (pthdb_user_t user, void *buf, pthdb_addr_t addr, size_t len) | |
512 | { | |
513 | int status, ret; | |
514 | ||
515 | DBG2(("pdc_write_data (user = %ld, buf = 0x%x, addr = 0x%llx, len = %d)", | |
516 | user, buf, addr, len)); | |
517 | ||
518 | status = target_write_memory (addr, buf, len); | |
519 | ret = status == 0 ? PDC_SUCCESS : PDC_FAILURE; | |
520 | ||
521 | DBG2((" status=%d, returning %s", status, pd_status2str (ret))); | |
522 | return ret; | |
523 | } | |
524 | ||
525 | /* pthdb callback: allocate a LEN-byte buffer and store a pointer to it in | |
526 | BUFP. */ | |
527 | ||
528 | static int | |
529 | pdc_alloc (pthdb_user_t user, size_t len, void **bufp) | |
530 | { | |
531 | DBG2(("pdc_alloc (user = %ld, len = %d, bufp = 0x%x)", user, len, bufp)); | |
532 | *bufp = xmalloc (len); | |
533 | DBG2((" malloc returned 0x%x", *bufp)); | |
534 | /* Note: xmalloc() can't return 0; therefore PDC_FAILURE will never be | |
535 | returned. */ | |
536 | return *bufp ? PDC_SUCCESS : PDC_FAILURE; | |
537 | } | |
538 | ||
539 | /* pthdb callback: reallocate BUF, which was allocated by the alloc or realloc | |
540 | callback, so that it contains LEN bytes, and store a pointer to the result | |
541 | in BUFP. */ | |
542 | ||
543 | static int | |
544 | pdc_realloc (pthdb_user_t user, void *buf, size_t len, void **bufp) | |
545 | { | |
546 | DBG2(("pdc_realloc (user = %ld, buf = 0x%x, len = %d, bufp = 0x%x)", | |
547 | user, buf, len, bufp)); | |
548 | *bufp = realloc (buf, len); | |
549 | DBG2((" realloc returned 0x%x", *bufp)); | |
550 | return *bufp ? PDC_SUCCESS : PDC_FAILURE; | |
551 | } | |
552 | ||
553 | /* pthdb callback: free BUF, which was allocated by the alloc or realloc | |
554 | callback. */ | |
555 | ||
556 | static int | |
557 | pdc_dealloc (pthdb_user_t user, void *buf) | |
558 | { | |
559 | DBG2(("pdc_free (user = %ld, buf = 0x%x)", user, buf)); | |
560 | xfree (buf); | |
561 | return PDC_SUCCESS; | |
562 | } | |
563 | ||
564 | /* Return a printable representation of pthread STATE. */ | |
565 | ||
566 | static char * | |
567 | state2str (pthdb_state_t state) | |
568 | { | |
569 | switch (state) | |
570 | { | |
571 | case PST_IDLE: return "idle"; /* being created */ | |
572 | case PST_RUN: return "running"; /* running */ | |
573 | case PST_SLEEP: return "sleeping"; /* awaiting an event */ | |
574 | case PST_READY: return "ready"; /* runnable */ | |
575 | case PST_TERM: return "finished"; /* awaiting a join/detach */ | |
576 | default: return "unknown"; | |
577 | } | |
578 | } | |
579 | ||
580 | /* qsort() comparison function for sorting pd_thread structs by pthid. */ | |
581 | ||
582 | static int | |
583 | pcmp (const void *p1v, const void *p2v) | |
584 | { | |
585 | struct pd_thread *p1 = (struct pd_thread *) p1v; | |
586 | struct pd_thread *p2 = (struct pd_thread *) p2v; | |
587 | return p1->pthid < p2->pthid ? -1 : p1->pthid > p2->pthid; | |
588 | } | |
589 | ||
590 | /* iterate_over_threads() callback for counting GDB threads. */ | |
591 | ||
592 | static int | |
593 | giter_count (struct thread_info *thread, void *countp) | |
594 | { | |
595 | (*(int *) countp)++; | |
596 | return 0; | |
597 | } | |
598 | ||
599 | /* iterate_over_threads() callback for accumulating GDB thread pids. */ | |
600 | ||
601 | static int | |
602 | giter_accum (struct thread_info *thread, void *bufp) | |
603 | { | |
604 | **(struct thread_info ***) bufp = thread; | |
605 | (*(struct thread_info ***) bufp)++; | |
606 | return 0; | |
607 | } | |
608 | ||
609 | /* ptid comparison function */ | |
610 | static int | |
611 | ptid_cmp (ptid_t ptid1, ptid_t ptid2) | |
612 | { | |
613 | int pid1, pid2; | |
614 | ||
615 | if (ptid_get_pid (ptid1) < ptid_get_pid (ptid2)) | |
616 | return -1; | |
617 | else if (ptid_get_pid (ptid1) > ptid_get_pid (ptid2)) | |
618 | return 1; | |
619 | else if (ptid_get_tid (ptid1) < ptid_get_tid (ptid2)) | |
620 | return -1; | |
621 | else if (ptid_get_tid (ptid1) > ptid_get_tid (ptid2)) | |
622 | return 1; | |
623 | else if (ptid_get_lwp (ptid1) < ptid_get_lwp (ptid2)) | |
624 | return -1; | |
625 | else if (ptid_get_lwp (ptid1) > ptid_get_lwp (ptid2)) | |
626 | return 1; | |
627 | else | |
628 | return 0; | |
629 | } | |
630 | ||
631 | /* qsort() comparison function for sorting thread_info structs by pid. */ | |
632 | ||
633 | static int | |
634 | gcmp (const void *t1v, const void *t2v) | |
635 | { | |
636 | struct thread_info *t1 = *(struct thread_info **) t1v; | |
637 | struct thread_info *t2 = *(struct thread_info **) t2v; | |
638 | return ptid_cmp (t1->ptid, t2->ptid); | |
639 | } | |
640 | ||
641 | /* Synchronize GDB's thread list with libpthdebug's. | |
642 | ||
643 | There are some benefits of doing this every time the inferior stops: | |
644 | ||
645 | - allows users to run thread-specific commands without needing to run | |
646 | "info threads" first | |
647 | ||
648 | - helps pthdb_tid_pthread() work properly (see "libpthdebug | |
649 | peculiarities" at the top of this module) | |
650 | ||
651 | - simplifies the demands placed on libpthdebug, which seems to have | |
652 | difficulty with certain call patterns */ | |
653 | ||
654 | static void | |
655 | sync_threadlists (void) | |
656 | { | |
657 | int cmd, status, infpid; | |
658 | int pcount, psize, pi, gcount, gi; | |
659 | struct pd_thread *pbuf; | |
660 | struct thread_info **gbuf, **g, *thread; | |
661 | pthdb_pthread_t pdtid; | |
662 | pthread_t pthid; | |
663 | pthdb_tid_t tid; | |
664 | ptid_t pptid, gptid; | |
665 | ||
666 | /* Accumulate an array of libpthdebug threads sorted by pthread id. */ | |
667 | ||
668 | pcount = 0; | |
669 | psize = 1; | |
670 | pbuf = (struct pd_thread *) xmalloc (psize * sizeof *pbuf); | |
671 | ||
672 | for (cmd = PTHDB_LIST_FIRST;; cmd = PTHDB_LIST_NEXT) | |
673 | { | |
674 | status = pthdb_pthread (pd_session, &pdtid, cmd); | |
675 | if (status != PTHDB_SUCCESS || pdtid == PTHDB_INVALID_PTHREAD) | |
676 | break; | |
677 | ||
678 | status = pthdb_pthread_ptid (pd_session, pdtid, &pthid); | |
679 | if (status != PTHDB_SUCCESS || pthid == PTHDB_INVALID_PTID) | |
680 | continue; | |
681 | ||
682 | if (pcount == psize) | |
683 | { | |
684 | psize *= 2; | |
685 | pbuf = (struct pd_thread *) xrealloc (pbuf, psize * sizeof *pbuf); | |
686 | } | |
687 | pbuf[pcount].pdtid = pdtid; | |
688 | pbuf[pcount].pthid = pthid; | |
689 | pcount++; | |
690 | } | |
691 | ||
692 | for (pi = 0; pi < pcount; pi++) | |
693 | { | |
694 | status = pthdb_pthread_tid (pd_session, pbuf[pi].pdtid, &tid); | |
695 | if (status != PTHDB_SUCCESS) | |
696 | tid = PTHDB_INVALID_TID; | |
697 | pbuf[pi].tid = tid; | |
698 | } | |
699 | ||
700 | qsort (pbuf, pcount, sizeof *pbuf, pcmp); | |
701 | ||
702 | /* Accumulate an array of GDB threads sorted by pid. */ | |
703 | ||
704 | gcount = 0; | |
705 | iterate_over_threads (giter_count, &gcount); | |
706 | g = gbuf = (struct thread_info **) xmalloc (gcount * sizeof *gbuf); | |
707 | iterate_over_threads (giter_accum, &g); | |
708 | qsort (gbuf, gcount, sizeof *gbuf, gcmp); | |
709 | ||
710 | /* Apply differences between the two arrays to GDB's thread list. */ | |
711 | ||
712 | infpid = PIDGET (inferior_ptid); | |
713 | for (pi = gi = 0; pi < pcount || gi < gcount;) | |
714 | { | |
715 | pptid = BUILD_THREAD (pbuf[pi].pthid, infpid); | |
716 | gptid = gbuf[gi]->ptid; | |
717 | pdtid = pbuf[pi].pdtid; | |
718 | tid = pbuf[pi].tid; | |
719 | ||
720 | if (pi == pcount) | |
721 | goto del; | |
722 | if (gi == gcount) | |
723 | goto add; | |
724 | ||
725 | if (ptid_equal (pptid, gptid)) | |
726 | { | |
727 | gbuf[gi]->private->pdtid = pdtid; | |
728 | gbuf[gi]->private->tid = tid; | |
729 | pi++; | |
730 | gi++; | |
731 | } | |
732 | else if (ptid_cmp (pptid, gptid) > 0) | |
733 | { | |
734 | del: | |
735 | delete_thread (gptid); | |
736 | gi++; | |
737 | } | |
738 | else | |
739 | { | |
740 | add: | |
741 | thread = add_thread (pptid); | |
742 | thread->private = xmalloc (sizeof (struct private_thread_info)); | |
743 | thread->private->pdtid = pdtid; | |
744 | thread->private->tid = tid; | |
745 | pi++; | |
746 | } | |
747 | ||
748 | } | |
749 | ||
750 | xfree (pbuf); | |
751 | xfree (gbuf); | |
752 | } | |
753 | ||
754 | /* iterate_over_threads() callback for locating a thread whose kernel thread | |
755 | just received a trap signal. */ | |
756 | ||
757 | static int | |
758 | iter_trap (struct thread_info *thread, void *unused) | |
759 | { | |
760 | struct thrdsinfo64 thrinf; | |
761 | pthdb_tid_t tid; | |
762 | ||
763 | /* getthrds(3) isn't prototyped in any AIX 4.3.3 #include file. */ | |
764 | extern int getthrds (pid_t, struct thrdsinfo64 *, int, pthdb_tid_t *, int); | |
765 | ||
766 | tid = thread->private->tid; | |
767 | if (tid == PTHDB_INVALID_TID) | |
768 | return 0; | |
769 | ||
770 | if (getthrds (PIDGET (inferior_ptid), &thrinf, sizeof (thrinf), &tid, 1) != 1) | |
771 | return 0; | |
772 | ||
773 | return thrinf.ti_cursig == SIGTRAP; | |
774 | } | |
775 | ||
776 | /* Synchronize libpthdebug's state with the inferior and with GDB, generate a | |
777 | composite process/thread <pid> for the current thread, set inferior_ptid to | |
778 | <pid> if SET_INFPID, and return <pid>. */ | |
779 | ||
780 | static ptid_t | |
781 | pd_update (int set_infpid) | |
782 | { | |
783 | int status; | |
784 | ptid_t ptid; | |
785 | struct thread_info *thread; | |
786 | ||
787 | if (!pd_active) | |
788 | return inferior_ptid; | |
789 | ||
790 | status = pthdb_session_update (pd_session); | |
791 | if (status != PTHDB_SUCCESS) | |
792 | return inferior_ptid; | |
793 | ||
794 | sync_threadlists (); | |
795 | ||
796 | /* Define "current thread" as one that just received a trap signal. */ | |
797 | ||
798 | thread = iterate_over_threads (iter_trap, NULL); | |
799 | if (!thread) | |
800 | ptid = inferior_ptid; | |
801 | else | |
802 | { | |
803 | ptid = thread->ptid; | |
804 | if (set_infpid) | |
805 | inferior_ptid = ptid; | |
806 | } | |
807 | return ptid; | |
808 | } | |
809 | ||
810 | /* Try to start debugging threads in the current process. If successful and | |
811 | SET_INFPID, set inferior_ptid to reflect the current thread. */ | |
812 | ||
813 | static ptid_t | |
814 | pd_activate (int set_infpid) | |
815 | { | |
816 | int status; | |
817 | ||
818 | status = pthdb_session_init (PD_USER, arch64 ? PEM_64BIT : PEM_32BIT, | |
819 | PTHDB_FLAG_REGS, &pd_callbacks, &pd_session); | |
820 | if (status != PTHDB_SUCCESS) | |
821 | { | |
822 | return inferior_ptid; | |
823 | } | |
824 | pd_active = 1; | |
825 | return pd_update (set_infpid); | |
826 | } | |
827 | ||
828 | /* Undo the effects of pd_activate(). */ | |
829 | ||
830 | static void | |
831 | pd_deactivate (void) | |
832 | { | |
833 | if (!pd_active) | |
834 | return; | |
835 | pthdb_session_destroy (pd_session); | |
836 | ||
837 | pid_to_prc (&inferior_ptid); | |
838 | pd_active = 0; | |
839 | } | |
840 | ||
841 | /* An object file has just been loaded. Check whether the current application | |
842 | is pthreaded, and if so, prepare for thread debugging. */ | |
843 | ||
844 | static void | |
845 | pd_enable (void) | |
846 | { | |
847 | int status; | |
848 | char *stub_name; | |
849 | struct minimal_symbol *ms; | |
850 | ||
851 | /* Don't initialize twice. */ | |
852 | if (pd_able) | |
853 | return; | |
854 | ||
855 | /* Check application word size. */ | |
856 | arch64 = REGISTER_RAW_SIZE (0) == 8; | |
857 | ||
858 | /* Check whether the application is pthreaded. */ | |
859 | stub_name = NULL; | |
860 | status = pthdb_session_pthreaded (PD_USER, PTHDB_FLAG_REGS, &pd_callbacks, | |
861 | &stub_name); | |
862 | if ((status != PTHDB_SUCCESS && status != PTHDB_NOT_PTHREADED) || !stub_name) | |
863 | return; | |
864 | ||
865 | /* Set a breakpoint on the returned stub function. */ | |
866 | if (!(ms = lookup_minimal_symbol (stub_name, NULL, NULL))) | |
867 | return; | |
868 | pd_brk_addr = SYMBOL_VALUE_ADDRESS (ms); | |
869 | if (!create_thread_event_breakpoint (pd_brk_addr)) | |
870 | return; | |
871 | ||
872 | /* Prepare for thread debugging. */ | |
873 | base_ops = current_target; | |
874 | push_target (&ops); | |
875 | pd_able = 1; | |
876 | ||
877 | /* If we're debugging a core file or an attached inferior, the pthread | |
878 | library may already have been initialized, so try to activate thread | |
879 | debugging. */ | |
880 | pd_activate (1); | |
881 | } | |
882 | ||
883 | /* Undo the effects of pd_enable(). */ | |
884 | ||
885 | static void | |
886 | pd_disable (void) | |
887 | { | |
888 | if (!pd_able) | |
889 | return; | |
890 | if (pd_active) | |
891 | pd_deactivate (); | |
892 | pd_able = 0; | |
893 | unpush_target (&ops); | |
894 | } | |
895 | ||
896 | /* target_new_objfile_hook callback. | |
897 | ||
898 | If OBJFILE is non-null, check whether a threaded application is being | |
899 | debugged, and if so, prepare for thread debugging. | |
900 | ||
901 | If OBJFILE is null, stop debugging threads. */ | |
902 | ||
903 | static void | |
904 | new_objfile (struct objfile *objfile) | |
905 | { | |
906 | if (objfile) | |
907 | pd_enable (); | |
908 | else | |
909 | pd_disable (); | |
910 | ||
911 | if (target_new_objfile_chain) | |
912 | target_new_objfile_chain (objfile); | |
913 | } | |
914 | ||
915 | /* Attach to process specified by ARGS. */ | |
916 | ||
917 | static void | |
918 | ops_attach (char *args, int from_tty) | |
919 | { | |
920 | base_ops.to_attach (args, from_tty); | |
921 | pd_activate (1); | |
922 | } | |
923 | ||
924 | /* Detach from the process attached to by ops_attach(). */ | |
925 | ||
926 | static void | |
927 | ops_detach (char *args, int from_tty) | |
928 | { | |
929 | pd_deactivate (); | |
930 | base_ops.to_detach (args, from_tty); | |
931 | } | |
932 | ||
933 | /* Tell the inferior process to continue running thread PID if != -1 | |
934 | and all threads otherwise. */ | |
935 | ||
936 | static void | |
937 | ops_resume (ptid_t ptid, int step, enum target_signal sig) | |
938 | { | |
939 | struct thread_info *thread; | |
940 | pthdb_tid_t tid[2]; | |
941 | ||
942 | if (!PD_TID (ptid)) | |
943 | CALL_BASE (base_ops.to_resume (ptid, step, sig)); | |
944 | else | |
945 | { | |
946 | thread = find_thread_pid (ptid); | |
947 | if (!thread) | |
948 | error ("aix-thread resume: unknown pthread %ld", TIDGET (ptid)); | |
949 | ||
950 | tid[0] = thread->private->tid; | |
951 | if (tid[0] == PTHDB_INVALID_TID) | |
952 | error ("aix-thread resume: no tid for pthread %ld", TIDGET (ptid)); | |
953 | tid[1] = 0; | |
954 | ||
955 | if (arch64) | |
956 | ptrace64aix (PTT_CONTINUE, tid[0], 1, target_signal_to_host (sig), (int *)tid); | |
957 | else | |
958 | ptrace32 (PTT_CONTINUE, tid[0], (int *) 1, | |
959 | target_signal_to_host (sig), (int *)tid); | |
960 | } | |
961 | } | |
962 | ||
963 | /* Wait for thread/process ID if != -1 or for any thread otherwise. If an | |
964 | error occurs, return -1, else return the pid of the stopped thread. */ | |
965 | ||
966 | static ptid_t | |
967 | ops_wait (ptid_t ptid, struct target_waitstatus *status) | |
968 | { | |
969 | pid_to_prc (&ptid); | |
970 | CALL_BASE (ptid = base_ops.to_wait (ptid, status)); | |
971 | if (PIDGET (ptid) == -1) | |
972 | return pid_to_ptid (-1); | |
973 | ||
974 | /* Check whether libpthdebug might be ready to be initialized. */ | |
975 | if (!pd_active && status->kind == TARGET_WAITKIND_STOPPED && | |
976 | status->value.sig == TARGET_SIGNAL_TRAP && | |
977 | read_pc_pid (ptid) - DECR_PC_AFTER_BREAK == pd_brk_addr) | |
978 | return pd_activate (0); | |
979 | ||
980 | return pd_update (0); | |
981 | } | |
982 | ||
983 | /* Record that the 64-bit general-purpose registers contain VALS. */ | |
984 | ||
985 | static void | |
986 | supply_gprs64 (uint64_t *vals) | |
987 | { | |
988 | int regno; | |
989 | ||
990 | for (regno = 0; regno < 32; regno++) | |
991 | supply_register (regno, (char *) (vals + regno)); | |
992 | } | |
993 | ||
994 | /* Record that 32-bit register REGNO contains VAL. */ | |
995 | ||
996 | static void | |
997 | supply_reg32 (int regno, uint32_t val) | |
998 | { | |
999 | supply_register (regno, (char *) &val); | |
1000 | } | |
1001 | ||
1002 | /* Record that the floating-point registers contain VALS. */ | |
1003 | ||
1004 | static void | |
1005 | supply_fprs (double *vals) | |
1006 | { | |
1007 | int regno; | |
1008 | ||
1009 | for (regno = 0; regno < 32; regno++) | |
1010 | supply_register (regno + FP0_REGNUM, (char *) (vals + regno)); | |
1011 | } | |
1012 | ||
1013 | /* Record that the special registers contain the specified 64-bit and 32-bit | |
1014 | values. */ | |
1015 | ||
1016 | static void | |
1017 | supply_sprs64 (uint64_t iar, uint64_t msr, uint32_t cr, | |
1018 | uint64_t lr, uint64_t ctr, uint32_t xer) | |
1019 | { | |
1020 | int regno = FIRST_UISA_SP_REGNUM; | |
1021 | supply_register (regno, (char *) &iar); | |
1022 | supply_register (regno + 1, (char *) &msr); | |
1023 | supply_register (regno + 2, (char *) &cr); | |
1024 | supply_register (regno + 3, (char *) &lr); | |
1025 | supply_register (regno + 4, (char *) &ctr); | |
1026 | supply_register (regno + 5, (char *) &xer); | |
1027 | } | |
1028 | ||
1029 | /* Record that the special registers contain the specified 32-bit values. */ | |
1030 | ||
1031 | static void | |
1032 | supply_sprs32 (uint32_t iar, uint32_t msr, uint32_t cr, | |
1033 | uint32_t lr, uint32_t ctr, uint32_t xer) | |
1034 | { | |
1035 | int regno = FIRST_UISA_SP_REGNUM; | |
1036 | supply_register (regno, (char *) &iar); | |
1037 | supply_register (regno + 1, (char *) &msr); | |
1038 | supply_register (regno + 2, (char *) &cr); | |
1039 | supply_register (regno + 3, (char *) &lr); | |
1040 | supply_register (regno + 4, (char *) &ctr); | |
1041 | supply_register (regno + 5, (char *) &xer); | |
1042 | } | |
1043 | ||
1044 | /* Fetch all registers from pthread PDTID, which doesn't have a kernel | |
1045 | thread. | |
1046 | ||
1047 | There's no way to query a single register from a non-kernel pthread, | |
1048 | so there's no need for a single-register version of this function. */ | |
1049 | ||
1050 | static void | |
1051 | fetch_regs_lib (pthdb_pthread_t pdtid) | |
1052 | { | |
1053 | int status, i; | |
1054 | pthdb_context_t ctx; | |
1055 | ||
1056 | DBG2 (("fetch_regs_lib %lx\n", (long)pdtid)); | |
1057 | status = pthdb_pthread_context (pd_session, pdtid, &ctx); | |
1058 | if (status != PTHDB_SUCCESS) | |
1059 | PD_ERROR ("fetch_registers: pthdb_pthread_context", status); | |
1060 | ||
1061 | /* General-purpose registers. */ | |
1062 | ||
1063 | if (arch64) | |
1064 | supply_gprs64 (ctx.gpr); | |
1065 | else | |
1066 | for (i = 0; i < 32; i++) | |
1067 | supply_reg32 (i, ctx.gpr[i]); | |
1068 | ||
1069 | /* Floating-point registers. */ | |
1070 | ||
1071 | supply_fprs (ctx.fpr); | |
1072 | ||
1073 | /* Special registers. */ | |
1074 | ||
1075 | if (arch64) | |
1076 | supply_sprs64 (ctx.iar, ctx.msr, ctx.cr, ctx.lr, ctx.ctr, ctx.xer); | |
1077 | else | |
1078 | supply_sprs32 (ctx.iar, ctx.msr, ctx.cr, ctx.lr, ctx.ctr, ctx.xer); | |
1079 | } | |
1080 | ||
1081 | /* Fetch register REGNO if != -1 or all registers otherwise from kernel thread | |
1082 | TID. | |
1083 | ||
1084 | AIX provides a way to query all of a kernel thread's GPRs, FPRs, or SPRs, | |
1085 | but there's no way to query individual registers within those groups. | |
1086 | Therefore, if REGNO != -1, this function fetches an entire group. | |
1087 | ||
1088 | Unfortunately, kernel thread register queries often fail with EPERM, | |
1089 | indicating that the thread is in kernel space. This breaks backtraces of | |
1090 | threads other than the current one. To make that breakage obvious without | |
1091 | throwing an error to top level (which is bad e.g. during "info threads" | |
1092 | output), zero registers that can't be retrieved. */ | |
1093 | ||
1094 | static void | |
1095 | fetch_regs_kern (int regno, pthdb_tid_t tid) | |
1096 | { | |
1097 | uint64_t gprs64[32]; | |
1098 | uint32_t gprs32[32]; | |
1099 | double fprs[32]; | |
1100 | struct ptxsprs sprs64; | |
1101 | struct ptsprs sprs32; | |
1102 | int i; | |
1103 | ||
1104 | DBG2 (("fetch_regs_kern tid=%lx regno=%d arch64=%d\n", (long)tid, regno, arch64)); | |
1105 | ||
1106 | /* General-purpose registers. */ | |
1107 | if (regno == -1 || regno < FP0_REGNUM) | |
1108 | { | |
1109 | if (arch64) | |
1110 | { | |
1111 | if (!ptrace64aix (PTT_READ_GPRS, tid, (unsigned long) gprs64, 0, NULL)) | |
1112 | memset (gprs64, 0, sizeof (gprs64)); | |
1113 | supply_gprs64 (gprs64); | |
1114 | } | |
1115 | else | |
1116 | { | |
1117 | if (!ptrace32 (PTT_READ_GPRS, tid, gprs32, 0, NULL)) | |
1118 | memset (gprs32, 0, sizeof (gprs32)); | |
1119 | for (i = 0; i < 32; i++) | |
1120 | supply_reg32 (i, gprs32[i]); | |
1121 | } | |
1122 | } | |
1123 | ||
1124 | /* Floating-point registers. */ | |
1125 | ||
1126 | if (regno == -1 || (regno >= FP0_REGNUM && regno <= FPLAST_REGNUM)) | |
1127 | { | |
1128 | if (!ptrace32 (PTT_READ_FPRS, tid, (int *) fprs, 0, NULL)) | |
1129 | memset (fprs, 0, sizeof (fprs)); | |
1130 | supply_fprs (fprs); | |
1131 | } | |
1132 | ||
1133 | /* Special-purpose registers. */ | |
1134 | ||
1135 | if (regno == -1 || (regno > FPLAST_REGNUM && regno <= LAST_UISA_SP_REGNUM)) | |
1136 | { | |
1137 | if (arch64) | |
1138 | { | |
1139 | if (!ptrace64aix (PTT_READ_SPRS, tid, (unsigned long) &sprs64, 0, NULL)) | |
1140 | memset (&sprs64, 0, sizeof (sprs64)); | |
1141 | supply_sprs64 (sprs64.pt_iar, sprs64.pt_msr, sprs64.pt_cr, | |
1142 | sprs64.pt_lr, sprs64.pt_ctr, sprs64.pt_xer); | |
1143 | } | |
1144 | else | |
1145 | { | |
1146 | if (!ptrace32 (PTT_READ_SPRS, tid, (int *) &sprs32, 0, NULL)) | |
1147 | memset (&sprs32, 0, sizeof (sprs32)); | |
1148 | supply_sprs32 (sprs32.pt_iar, sprs32.pt_msr, sprs32.pt_cr, | |
1149 | sprs32.pt_lr, sprs32.pt_ctr, sprs32.pt_xer); | |
1150 | ||
1151 | if (REGISTER_RAW_SIZE (LAST_UISA_SP_REGNUM)) | |
1152 | supply_register (LAST_UISA_SP_REGNUM, (char *) &sprs32.pt_mq); | |
1153 | } | |
1154 | } | |
1155 | } | |
1156 | ||
1157 | /* Fetch register REGNO if != -1 or all registers otherwise in the | |
1158 | thread/process specified by inferior_ptid. */ | |
1159 | ||
1160 | static void | |
1161 | ops_fetch_registers (int regno) | |
1162 | { | |
1163 | struct thread_info *thread; | |
1164 | pthdb_tid_t tid; | |
1165 | ||
1166 | if (!PD_TID (inferior_ptid)) | |
1167 | base_ops.to_fetch_registers (regno); | |
1168 | else | |
1169 | { | |
1170 | thread = find_thread_pid (inferior_ptid); | |
1171 | tid = thread->private->tid; | |
1172 | ||
1173 | if (tid == PTHDB_INVALID_TID) | |
1174 | fetch_regs_lib (thread->private->pdtid); | |
1175 | else | |
1176 | fetch_regs_kern (regno, tid); | |
1177 | } | |
1178 | } | |
1179 | ||
1180 | /* Store the special registers into the specified 64-bit and 32-bit | |
1181 | locations. */ | |
1182 | ||
1183 | static void | |
1184 | fill_sprs64 (uint64_t *iar, uint64_t *msr, uint32_t *cr, | |
1185 | uint64_t *lr, uint64_t *ctr, uint32_t *xer) | |
1186 | { | |
1187 | int regno = FIRST_UISA_SP_REGNUM; | |
1188 | *iar = read_register (regno); | |
1189 | *msr = read_register (regno + 1); | |
1190 | *cr = read_register (regno + 2); | |
1191 | *lr = read_register (regno + 3); | |
1192 | *ctr = read_register (regno + 4); | |
1193 | *xer = read_register (regno + 5); | |
1194 | } | |
1195 | ||
1196 | /* Store all registers into pthread PDTID, which doesn't have a kernel | |
1197 | thread. | |
1198 | ||
1199 | It's possible to store a single register into a non-kernel pthread, but I | |
1200 | doubt it's worth the effort. */ | |
1201 | ||
1202 | static void | |
1203 | store_regs_lib (pthdb_pthread_t pdtid) | |
1204 | { | |
1205 | int status, i; | |
1206 | pthdb_context_t ctx; | |
1207 | ||
1208 | DBG2 (("store_regs_lib %lx\n", (long)pdtid)); | |
1209 | ||
1210 | /* Retrieve the thread's current context for its non-register values. */ | |
1211 | status = pthdb_pthread_context (pd_session, pdtid, &ctx); | |
1212 | if (status != PTHDB_SUCCESS) | |
1213 | PD_ERROR ("store_registers: pthdb_pthread_context", status); | |
1214 | ||
1215 | /* General-purpose registers. */ | |
1216 | ||
1217 | for (i = 0; i < 32; i++) | |
1218 | ctx.gpr[i] = read_register (i); | |
1219 | ||
1220 | /* Floating-point registers. */ | |
1221 | ||
1222 | for (i = 0; i < 32; i++) | |
1223 | ctx.fpr[i] = *(double *) ®isters[REGISTER_BYTE (FP0_REGNUM + i)]; | |
1224 | ||
1225 | /* Special registers. */ | |
1226 | ||
1227 | fill_sprs64 (&ctx.iar, &ctx.msr, &ctx.cr, &ctx.lr, &ctx.ctr, &ctx.xer); | |
1228 | ||
1229 | status = pthdb_pthread_setcontext (pd_session, pdtid, &ctx); | |
1230 | if (status != PTHDB_SUCCESS) | |
1231 | PD_ERROR ("store_registers: pthdb_pthread_setcontext", status); | |
1232 | } | |
1233 | ||
1234 | /* Store register REGNO if != -1 or all registers otherwise into kernel | |
1235 | thread TID. | |
1236 | ||
1237 | AIX provides a way to set all of a kernel thread's GPRs, FPRs, or SPRs, but | |
1238 | there's no way to set individual registers within those groups. Therefore, | |
1239 | if REGNO != -1, this function stores an entire group. */ | |
1240 | ||
1241 | static void | |
1242 | store_regs_kern (int regno, pthdb_tid_t tid) | |
1243 | { | |
1244 | struct ptxsprs sprs64; | |
1245 | struct ptsprs sprs32; | |
1246 | char *regp; | |
1247 | ||
1248 | DBG2 (("store_regs_kern tid=%lx regno=%d\n", (long)tid, regno)); | |
1249 | ||
1250 | /* General-purpose registers. */ | |
1251 | if (regno == -1 || regno < FP0_REGNUM) | |
1252 | { | |
1253 | regp = ®isters[REGISTER_BYTE (0)]; | |
1254 | if (arch64) | |
1255 | ptrace64aix (PTT_WRITE_GPRS, tid, (unsigned long) regp, 0, NULL); | |
1256 | else | |
1257 | ptrace32 (PTT_WRITE_GPRS, tid, (int *) regp, 0, NULL); | |
1258 | } | |
1259 | ||
1260 | /* Floating-point registers. */ | |
1261 | ||
1262 | if (regno == -1 || (regno >= FP0_REGNUM && regno <= FPLAST_REGNUM)) | |
1263 | { | |
1264 | regp = ®isters[REGISTER_BYTE (FP0_REGNUM)]; | |
1265 | ptrace32 (PTT_WRITE_FPRS, tid, (int *) regp, 0, NULL); | |
1266 | } | |
1267 | ||
1268 | /* Special-purpose registers. */ | |
1269 | ||
1270 | if (regno == -1 || (regno > FPLAST_REGNUM && regno <= LAST_UISA_SP_REGNUM)) | |
1271 | { | |
1272 | if (arch64) | |
1273 | { | |
1274 | ptrace64aix (PTT_READ_SPRS, tid, (unsigned long) &sprs64, 0, NULL); | |
1275 | fill_sprs64 (&sprs64.pt_iar, &sprs64.pt_msr, &sprs64.pt_cr, | |
1276 | &sprs64.pt_lr, &sprs64.pt_ctr, &sprs64.pt_xer); | |
1277 | ptrace64aix (PTT_WRITE_SPRS, tid, (unsigned long) &sprs64, 0, NULL); | |
1278 | } | |
1279 | else | |
1280 | { | |
1281 | ptrace32 (PTT_READ_SPRS, tid, (int *) &sprs32, 0, NULL); | |
1282 | ||
1283 | regno = FIRST_UISA_SP_REGNUM; | |
1284 | sprs32.pt_iar = read_register (regno); | |
1285 | sprs32.pt_msr = read_register (regno + 1); | |
1286 | sprs32.pt_cr = read_register (regno + 2); | |
1287 | sprs32.pt_lr = read_register (regno + 3); | |
1288 | sprs32.pt_ctr = read_register (regno + 4); | |
1289 | sprs32.pt_xer = read_register (regno + 5); | |
1290 | ||
1291 | if (REGISTER_RAW_SIZE (LAST_UISA_SP_REGNUM)) | |
1292 | sprs32.pt_mq = read_register (LAST_UISA_SP_REGNUM); | |
1293 | ||
1294 | ptrace32 (PTT_WRITE_SPRS, tid, (int *) &sprs32, 0, NULL); | |
1295 | } | |
1296 | } | |
1297 | } | |
1298 | ||
1299 | /* Store gdb's current view of the register set into the thread/process | |
1300 | specified by inferior_ptid. */ | |
1301 | ||
1302 | static void | |
1303 | ops_store_registers (int regno) | |
1304 | { | |
1305 | struct thread_info *thread; | |
1306 | pthdb_tid_t tid; | |
1307 | ||
1308 | if (!PD_TID (inferior_ptid)) | |
1309 | base_ops.to_store_registers (regno); | |
1310 | else | |
1311 | { | |
1312 | thread = find_thread_pid (inferior_ptid); | |
1313 | tid = thread->private->tid; | |
1314 | ||
1315 | if (tid == PTHDB_INVALID_TID) | |
1316 | store_regs_lib (thread->private->pdtid); | |
1317 | else | |
1318 | store_regs_kern (regno, tid); | |
1319 | } | |
1320 | } | |
1321 | ||
1322 | /* Prepare to modify the registers array. */ | |
1323 | ||
1324 | static void | |
1325 | ops_prepare_to_store (void) | |
1326 | { | |
1327 | if (!PD_TID (inferior_ptid)) | |
1328 | base_ops.to_prepare_to_store (); | |
1329 | else | |
1330 | read_register_bytes (0, NULL, REGISTER_BYTES); | |
1331 | } | |
1332 | ||
1333 | /* Transfer LEN bytes of memory from GDB address MYADDR to target address | |
1334 | MEMADDR if WRITE and vice versa otherwise. */ | |
1335 | ||
1336 | static int | |
1337 | ops_xfer_memory (CORE_ADDR memaddr, char *myaddr, int len, int write, | |
1338 | struct mem_attrib *attrib, | |
1339 | struct target_ops *target) | |
1340 | { | |
1341 | int n; | |
1342 | ||
1343 | CALL_BASE (n = base_ops.to_xfer_memory (memaddr, myaddr, len, write, | |
1344 | attrib, &base_ops)); | |
1345 | return n; | |
1346 | } | |
1347 | ||
1348 | /* Kill and forget about the inferior process. */ | |
1349 | ||
1350 | static void | |
1351 | ops_kill (void) | |
1352 | { | |
1353 | CALL_BASE (base_ops.to_kill ()); | |
1354 | } | |
1355 | ||
1356 | /* Clean up after the inferior exits. */ | |
1357 | ||
1358 | static void | |
1359 | ops_mourn_inferior (void) | |
1360 | { | |
1361 | pd_deactivate (); | |
1362 | base_ops.to_mourn_inferior (); | |
1363 | } | |
1364 | ||
1365 | /* Return whether thread PID is still valid. */ | |
1366 | ||
1367 | static int | |
1368 | ops_thread_alive (ptid_t ptid) | |
1369 | { | |
1370 | if (!PD_TID (ptid)) | |
1371 | return base_ops.to_thread_alive (ptid); | |
1372 | ||
1373 | /* We update the thread list every time the child stops, so all valid | |
1374 | threads should be in the thread list. */ | |
1375 | return in_thread_list (ptid); | |
1376 | } | |
1377 | ||
1378 | /* Return a printable representation of composite PID for use in "info | |
1379 | threads" output. */ | |
1380 | ||
1381 | static char * | |
1382 | ops_pid_to_str (ptid_t ptid) | |
1383 | { | |
1384 | static char *ret = NULL; | |
1385 | ||
1386 | if (!PD_TID (ptid)) | |
1387 | return base_ops.to_pid_to_str (ptid); | |
1388 | ||
1389 | /* Free previous return value; a new one will be allocated by | |
1390 | xasprintf(). */ | |
1391 | xfree (ret); | |
1392 | ||
1393 | xasprintf (&ret, "Thread %ld", ptid_get_tid (ptid)); | |
1394 | return ret; | |
1395 | } | |
1396 | ||
1397 | /* Return a printable representation of extra information about THREAD, for | |
1398 | use in "info threads" output. */ | |
1399 | ||
1400 | static char * | |
1401 | ops_extra_thread_info (struct thread_info *thread) | |
1402 | { | |
1403 | struct ui_file *buf; | |
1404 | int status; | |
1405 | pthdb_pthread_t pdtid; | |
1406 | pthdb_tid_t tid; | |
1407 | pthdb_state_t state; | |
1408 | pthdb_suspendstate_t suspendstate; | |
1409 | pthdb_detachstate_t detachstate; | |
1410 | int cancelpend; | |
1411 | long length; | |
1412 | static char *ret = NULL; | |
1413 | ||
1414 | if (!PD_TID (thread->ptid)) | |
1415 | return NULL; | |
1416 | ||
1417 | buf = mem_fileopen (); | |
1418 | ||
1419 | pdtid = thread->private->pdtid; | |
1420 | tid = thread->private->tid; | |
1421 | ||
1422 | if (tid != PTHDB_INVALID_TID) | |
1423 | fprintf_unfiltered (buf, "tid %d", tid); | |
1424 | ||
1425 | status = pthdb_pthread_state (pd_session, pdtid, &state); | |
1426 | if (status != PTHDB_SUCCESS) | |
1427 | state = PST_NOTSUP; | |
1428 | fprintf_unfiltered (buf, ", %s", state2str (state)); | |
1429 | ||
1430 | status = pthdb_pthread_suspendstate (pd_session, pdtid, &suspendstate); | |
1431 | if (status == PTHDB_SUCCESS && suspendstate == PSS_SUSPENDED) | |
1432 | fprintf_unfiltered (buf, ", suspended"); | |
1433 | ||
1434 | status = pthdb_pthread_detachstate (pd_session, pdtid, &detachstate); | |
1435 | if (status == PTHDB_SUCCESS && detachstate == PDS_DETACHED) | |
1436 | fprintf_unfiltered (buf, ", detached"); | |
1437 | ||
1438 | pthdb_pthread_cancelpend (pd_session, pdtid, &cancelpend); | |
1439 | if (status == PTHDB_SUCCESS && cancelpend) | |
1440 | fprintf_unfiltered (buf, ", cancel pending"); | |
1441 | ||
1442 | ui_file_write (buf, "", 1); | |
1443 | ||
1444 | xfree (ret); /* Free old buffer. */ | |
1445 | ||
1446 | ret = ui_file_xstrdup (buf, &length); | |
1447 | ui_file_delete (buf); | |
1448 | ||
1449 | return ret; | |
1450 | } | |
1451 | ||
1452 | /* Initialize target ops. */ | |
1453 | ||
1454 | static void | |
1455 | init_ops (void) | |
1456 | { | |
1457 | ops.to_shortname = "aix-threads"; | |
1458 | ops.to_longname = "AIX pthread support"; | |
1459 | ops.to_doc = "AIX pthread support"; | |
1460 | ||
1461 | ops.to_attach = ops_attach; | |
1462 | ops.to_detach = ops_detach; | |
1463 | ops.to_resume = ops_resume; | |
1464 | ops.to_wait = ops_wait; | |
1465 | ops.to_fetch_registers = ops_fetch_registers; | |
1466 | ops.to_store_registers = ops_store_registers; | |
1467 | ops.to_prepare_to_store = ops_prepare_to_store; | |
1468 | ops.to_xfer_memory = ops_xfer_memory; | |
1469 | /* No need for ops.to_create_inferior, because we activate thread debugging | |
1470 | when the inferior reaches pd_brk_addr. */ | |
1471 | ops.to_kill = ops_kill; | |
1472 | ops.to_mourn_inferior = ops_mourn_inferior; | |
1473 | ops.to_thread_alive = ops_thread_alive; | |
1474 | ops.to_pid_to_str = ops_pid_to_str; | |
1475 | ops.to_extra_thread_info = ops_extra_thread_info; | |
1476 | ops.to_stratum = thread_stratum; | |
1477 | ops.to_magic = OPS_MAGIC; | |
1478 | } | |
1479 | ||
1480 | /* Module startup initialization function, automagically called by | |
1481 | init.c. */ | |
1482 | ||
1483 | void | |
1484 | _initialize_aix_thread (void) | |
1485 | { | |
1486 | init_ops (); | |
1487 | add_target (&ops); | |
1488 | ||
1489 | /* Notice when object files get loaded and unloaded. */ | |
1490 | target_new_objfile_chain = target_new_objfile_hook; | |
1491 | target_new_objfile_hook = new_objfile; | |
1492 | } |