1/* Low level interface for debugging AIX 4.3+ pthreads. 2 3 Copyright (C) 1999, 2000, 2002, 2007 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 3 of the License, or 11 (at your option) any later version. 12 13 This program is distributed in the hope that it will be useful, 14 but WITHOUT ANY WARRANTY; without even the implied warranty of 15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16 GNU General Public License for more details. 17 18 You should have received a copy of the GNU General Public License 19 along with this program. If not, see <http://www.gnu.org/licenses/>. */ 20 21 22/* This module uses the libpthdebug.a library provided by AIX 4.3+ for 23 debugging pthread applications. 24 25 Some name prefix conventions: 26 pthdb_ provided by libpthdebug.a 27 pdc_ callbacks that this module provides to libpthdebug.a 28 pd_ variables or functions interfacing with libpthdebug.a 29 30 libpthdebug peculiarities: 31 32 - pthdb_ptid_pthread() is prototyped in <sys/pthdebug.h>, but 33 it's not documented, and after several calls it stops working 34 and causes other libpthdebug functions to fail. 35 36 - pthdb_tid_pthread() doesn't always work after 37 pthdb_session_update(), but it does work after cycling through 38 all threads using pthdb_pthread(). 39 40 */ 41 42#include "defs.h" 43#include "gdb_assert.h" 44#include "gdbthread.h" 45#include "target.h" 46#include "inferior.h" 47#include "regcache.h" 48#include "gdbcmd.h" 49#include "ppc-tdep.h" 50#include "gdb_string.h" 51#include "observer.h" 52 53#include <procinfo.h> 54#include <sys/types.h> 55#include <sys/ptrace.h> 56#include <sys/reg.h> 57#include <sched.h> 58#include <sys/pthdebug.h> 59 60/* Whether to emit debugging output. */ 61static int debug_aix_thread; 62 63/* In AIX 5.1, functions use pthdb_tid_t instead of tid_t. */ 64#ifndef PTHDB_VERSION_3 65#define pthdb_tid_t tid_t 66#endif 67 68/* Return whether to treat PID as a debuggable thread id. */ 69 70#define PD_TID(ptid) (pd_active && ptid_get_tid (ptid) != 0) 71 72/* Build a thread ptid. */ 73#define BUILD_THREAD(TID, PID) ptid_build (PID, 0, TID) 74 75/* Build and lwp ptid. */ 76#define BUILD_LWP(LWP, PID) MERGEPID (PID, LWP) 77 78/* pthdb_user_t value that we pass to pthdb functions. 0 causes 79 PTHDB_BAD_USER errors, so use 1. */ 80 81#define PD_USER 1 82 83/* Success and failure values returned by pthdb callbacks. */ 84 85#define PDC_SUCCESS PTHDB_SUCCESS 86#define PDC_FAILURE PTHDB_CALLBACK 87 88/* Private data attached to each element in GDB's thread list. */ 89 90struct private_thread_info { 91 pthdb_pthread_t pdtid; /* thread's libpthdebug id */ 92 pthdb_tid_t tid; /* kernel thread id */ 93}; 94 95/* Information about a thread of which libpthdebug is aware. */ 96 97struct pd_thread { 98 pthdb_pthread_t pdtid; 99 pthread_t pthid; 100 pthdb_tid_t tid; 101}; 102 103/* This module's target-specific operations, active while pd_able is true. */ 104 105static struct target_ops aix_thread_ops; 106 107/* Copy of the target over which ops is pushed. This is more 108 convenient than a pointer to deprecated_child_ops or core_ops, 109 because they lack current_target's default callbacks. */ 110 111static struct target_ops base_target; 112 113/* Address of the function that libpthread will call when libpthdebug 114 is ready to be initialized. */ 115 116static CORE_ADDR pd_brk_addr; 117 118/* Whether the current application is debuggable by pthdb. */ 119 120static int pd_able = 0; 121 122/* Whether a threaded application is being debugged. */ 123 124static int pd_active = 0; 125 126/* Whether the current architecture is 64-bit. 127 Only valid when pd_able is true. */ 128 129static int arch64; 130 131/* Forward declarations for pthdb callbacks. */ 132 133static int pdc_symbol_addrs (pthdb_user_t, pthdb_symbol_t *, int); 134static int pdc_read_data (pthdb_user_t, void *, pthdb_addr_t, size_t); 135static int pdc_write_data (pthdb_user_t, void *, pthdb_addr_t, size_t); 136static int pdc_read_regs (pthdb_user_t user, pthdb_tid_t tid, 137 unsigned long long flags, 138 pthdb_context_t *context); 139static int pdc_write_regs (pthdb_user_t user, pthdb_tid_t tid, 140 unsigned long long flags, 141 pthdb_context_t *context); 142static int pdc_alloc (pthdb_user_t, size_t, void **); 143static int pdc_realloc (pthdb_user_t, void *, size_t, void **); 144static int pdc_dealloc (pthdb_user_t, void *); 145 146/* pthdb callbacks. */ 147 148static pthdb_callbacks_t pd_callbacks = { 149 pdc_symbol_addrs, 150 pdc_read_data, 151 pdc_write_data, 152 pdc_read_regs, 153 pdc_write_regs, 154 pdc_alloc, 155 pdc_realloc, 156 pdc_dealloc, 157 NULL 158}; 159 160/* Current pthdb session. */ 161 162static pthdb_session_t pd_session; 163 164/* Return a printable representation of pthdebug function return 165 STATUS. */ 166 167static char * 168pd_status2str (int status) 169{ 170 switch (status) 171 { 172 case PTHDB_SUCCESS: return "SUCCESS"; 173 case PTHDB_NOSYS: return "NOSYS"; 174 case PTHDB_NOTSUP: return "NOTSUP"; 175 case PTHDB_BAD_VERSION: return "BAD_VERSION"; 176 case PTHDB_BAD_USER: return "BAD_USER"; 177 case PTHDB_BAD_SESSION: return "BAD_SESSION"; 178 case PTHDB_BAD_MODE: return "BAD_MODE"; 179 case PTHDB_BAD_FLAGS: return "BAD_FLAGS"; 180 case PTHDB_BAD_CALLBACK: return "BAD_CALLBACK"; 181 case PTHDB_BAD_POINTER: return "BAD_POINTER"; 182 case PTHDB_BAD_CMD: return "BAD_CMD"; 183 case PTHDB_BAD_PTHREAD: return "BAD_PTHREAD"; 184 case PTHDB_BAD_ATTR: return "BAD_ATTR"; 185 case PTHDB_BAD_MUTEX: return "BAD_MUTEX"; 186 case PTHDB_BAD_MUTEXATTR: return "BAD_MUTEXATTR"; 187 case PTHDB_BAD_COND: return "BAD_COND"; 188 case PTHDB_BAD_CONDATTR: return "BAD_CONDATTR"; 189 case PTHDB_BAD_RWLOCK: return "BAD_RWLOCK"; 190 case PTHDB_BAD_RWLOCKATTR: return "BAD_RWLOCKATTR"; 191 case PTHDB_BAD_KEY: return "BAD_KEY"; 192 case PTHDB_BAD_PTID: return "BAD_PTID"; 193 case PTHDB_BAD_TID: return "BAD_TID"; 194 case PTHDB_CALLBACK: return "CALLBACK"; 195 case PTHDB_CONTEXT: return "CONTEXT"; 196 case PTHDB_HELD: return "HELD"; 197 case PTHDB_NOT_HELD: return "NOT_HELD"; 198 case PTHDB_MEMORY: return "MEMORY"; 199 case PTHDB_NOT_PTHREADED: return "NOT_PTHREADED"; 200 case PTHDB_SYMBOL: return "SYMBOL"; 201 case PTHDB_NOT_AVAIL: return "NOT_AVAIL"; 202 case PTHDB_INTERNAL: return "INTERNAL"; 203 default: return "UNKNOWN"; 204 } 205} 206 207/* A call to ptrace(REQ, ID, ...) just returned RET. Check for 208 exceptional conditions and either return nonlocally or else return 209 1 for success and 0 for failure. */ 210 211static int 212ptrace_check (int req, int id, int ret) 213{ 214 if (ret == 0 && !errno) 215 return 1; 216 217 /* According to ptrace(2), ptrace may fail with EPERM if "the 218 Identifier parameter corresponds to a kernel thread which is 219 stopped in kernel mode and whose computational state cannot be 220 read or written." This happens quite often with register reads. */ 221 222 switch (req) 223 { 224 case PTT_READ_GPRS: 225 case PTT_READ_FPRS: 226 case PTT_READ_SPRS: 227 if (ret == -1 && errno == EPERM) 228 { 229 if (debug_aix_thread) 230 fprintf_unfiltered (gdb_stdlog, 231 "ptrace (%d, %d) = %d (errno = %d)\n", 232 req, id, ret, errno); 233 return ret == -1 ? 0 : 1; 234 } 235 break; 236 } 237 error (_("aix-thread: ptrace (%d, %d) returned %d (errno = %d %s)"), 238 req, id, ret, errno, safe_strerror (errno)); 239 return 0; /* Not reached. */ 240} 241 242/* Call ptracex (REQ, ID, ADDR, DATA, BUF). Return success. */ 243 244static int 245ptrace64aix (int req, int id, long long addr, int data, int *buf) 246{ 247 errno = 0; 248 return ptrace_check (req, id, ptracex (req, id, addr, data, buf)); 249} 250 251/* Call ptrace (REQ, ID, ADDR, DATA, BUF). Return success. */ 252 253static int 254ptrace32 (int req, int id, int *addr, int data, int *buf) 255{ 256 errno = 0; 257 return ptrace_check (req, id, 258 ptrace (req, id, (int *) addr, data, buf)); 259} 260 261/* If *PIDP is a composite process/thread id, convert it to a 262 process id. */ 263 264static void 265pid_to_prc (ptid_t *ptidp) 266{ 267 ptid_t ptid; 268 269 ptid = *ptidp; 270 if (PD_TID (ptid)) 271 *ptidp = pid_to_ptid (PIDGET (ptid)); 272} 273 274/* pthdb callback: for <i> from 0 to COUNT, set SYMBOLS[<i>].addr to 275 the address of SYMBOLS[<i>].name. */ 276 277static int 278pdc_symbol_addrs (pthdb_user_t user, pthdb_symbol_t *symbols, int count) 279{ 280 struct minimal_symbol *ms; 281 int i; 282 char *name; 283 284 if (debug_aix_thread) 285 fprintf_unfiltered (gdb_stdlog, 286 "pdc_symbol_addrs (user = %ld, symbols = 0x%lx, count = %d)\n", 287 user, (long) symbols, count); 288 289 for (i = 0; i < count; i++) 290 { 291 name = symbols[i].name; 292 if (debug_aix_thread) 293 fprintf_unfiltered (gdb_stdlog, 294 " symbols[%d].name = \"%s\"\n", i, name); 295 296 if (!*name) 297 symbols[i].addr = 0; 298 else 299 { 300 if (!(ms = lookup_minimal_symbol (name, NULL, NULL))) 301 { 302 if (debug_aix_thread) 303 fprintf_unfiltered (gdb_stdlog, " returning PDC_FAILURE\n"); 304 return PDC_FAILURE; 305 } 306 symbols[i].addr = SYMBOL_VALUE_ADDRESS (ms); 307 } 308 if (debug_aix_thread) 309 fprintf_unfiltered (gdb_stdlog, " symbols[%d].addr = %s\n", 310 i, hex_string (symbols[i].addr)); 311 } 312 if (debug_aix_thread) 313 fprintf_unfiltered (gdb_stdlog, " returning PDC_SUCCESS\n"); 314 return PDC_SUCCESS; 315} 316 317/* Read registers call back function should be able to read the 318 context information of a debuggee kernel thread from an active 319 process or from a core file. The information should be formatted 320 in context64 form for both 32-bit and 64-bit process. 321 If successful return 0, else non-zero is returned. */ 322 323static int 324pdc_read_regs (pthdb_user_t user, 325 pthdb_tid_t tid, 326 unsigned long long flags, 327 pthdb_context_t *context) 328{ 329 /* This function doesn't appear to be used, so we could probably 330 just return 0 here. HOWEVER, if it is not defined, the OS will 331 complain and several thread debug functions will fail. In case 332 this is needed, I have implemented what I think it should do, 333 however this code is untested. */ 334 335 uint64_t gprs64[ppc_num_gprs]; 336 uint32_t gprs32[ppc_num_gprs]; 337 double fprs[ppc_num_fprs]; 338 struct ptxsprs sprs64; 339 struct ptsprs sprs32; 340 341 if (debug_aix_thread) 342 fprintf_unfiltered (gdb_stdlog, "pdc_read_regs tid=%d flags=%s\n", 343 (int) tid, hex_string (flags)); 344 345 /* General-purpose registers. */ 346 if (flags & PTHDB_FLAG_GPRS) 347 { 348 if (arch64) 349 { 350 if (!ptrace64aix (PTT_READ_GPRS, tid, 351 (unsigned long) gprs64, 0, NULL)) 352 memset (gprs64, 0, sizeof (gprs64)); 353 memcpy (context->gpr, gprs64, sizeof(gprs64)); 354 } 355 else 356 { 357 if (!ptrace32 (PTT_READ_GPRS, tid, gprs32, 0, NULL)) 358 memset (gprs32, 0, sizeof (gprs32)); 359 memcpy (context->gpr, gprs32, sizeof(gprs32)); 360 } 361 } 362 363 /* Floating-point registers. */ 364 if (flags & PTHDB_FLAG_FPRS) 365 { 366 if (!ptrace32 (PTT_READ_FPRS, tid, (int *) fprs, 0, NULL)) 367 memset (fprs, 0, sizeof (fprs)); 368 memcpy (context->fpr, fprs, sizeof(fprs)); 369 } 370 371 /* Special-purpose registers. */ 372 if (flags & PTHDB_FLAG_SPRS) 373 { 374 if (arch64) 375 { 376 if (!ptrace64aix (PTT_READ_SPRS, tid, 377 (unsigned long) &sprs64, 0, NULL)) 378 memset (&sprs64, 0, sizeof (sprs64)); 379 memcpy (&context->msr, &sprs64, sizeof(sprs64)); 380 } 381 else 382 { 383 if (!ptrace32 (PTT_READ_SPRS, tid, (int *) &sprs32, 0, NULL)) 384 memset (&sprs32, 0, sizeof (sprs32)); 385 memcpy (&context->msr, &sprs32, sizeof(sprs32)); 386 } 387 } 388 return 0; 389} 390 391/* Write register function should be able to write requested context 392 information to specified debuggee's kernel thread id. 393 If successful return 0, else non-zero is returned. */ 394 395static int 396pdc_write_regs (pthdb_user_t user, 397 pthdb_tid_t tid, 398 unsigned long long flags, 399 pthdb_context_t *context) 400{ 401 /* This function doesn't appear to be used, so we could probably 402 just return 0 here. HOWEVER, if it is not defined, the OS will 403 complain and several thread debug functions will fail. In case 404 this is needed, I have implemented what I think it should do, 405 however this code is untested. */ 406 407 if (debug_aix_thread) 408 fprintf_unfiltered (gdb_stdlog, "pdc_write_regs tid=%d flags=%s\n", 409 (int) tid, hex_string (flags)); 410 411 /* General-purpose registers. */ 412 if (flags & PTHDB_FLAG_GPRS) 413 { 414 if (arch64) 415 ptrace64aix (PTT_WRITE_GPRS, tid, 416 (unsigned long) context->gpr, 0, NULL); 417 else 418 ptrace32 (PTT_WRITE_GPRS, tid, (int *) context->gpr, 0, NULL); 419 } 420 421 /* Floating-point registers. */ 422 if (flags & PTHDB_FLAG_FPRS) 423 { 424 ptrace32 (PTT_WRITE_FPRS, tid, (int *) context->fpr, 0, NULL); 425 } 426 427 /* Special-purpose registers. */ 428 if (flags & PTHDB_FLAG_SPRS) 429 { 430 if (arch64) 431 { 432 ptrace64aix (PTT_WRITE_SPRS, tid, 433 (unsigned long) &context->msr, 0, NULL); 434 } 435 else 436 { 437 ptrace32 (PTT_WRITE_SPRS, tid, (int *) &context->msr, 0, NULL); 438 } 439 } 440 return 0; 441} 442 443/* pthdb callback: read LEN bytes from process ADDR into BUF. */ 444 445static int 446pdc_read_data (pthdb_user_t user, void *buf, 447 pthdb_addr_t addr, size_t len) 448{ 449 int status, ret; 450 451 if (debug_aix_thread) 452 fprintf_unfiltered (gdb_stdlog, 453 "pdc_read_data (user = %ld, buf = 0x%lx, addr = %s, len = %ld)\n", 454 user, (long) buf, hex_string (addr), len); 455 456 status = target_read_memory (addr, buf, len); 457 ret = status == 0 ? PDC_SUCCESS : PDC_FAILURE; 458 459 if (debug_aix_thread) 460 fprintf_unfiltered (gdb_stdlog, " status=%d, returning %s\n", 461 status, pd_status2str (ret)); 462 return ret; 463} 464 465/* pthdb callback: write LEN bytes from BUF to process ADDR. */ 466 467static int 468pdc_write_data (pthdb_user_t user, void *buf, 469 pthdb_addr_t addr, size_t len) 470{ 471 int status, ret; 472 473 if (debug_aix_thread) 474 fprintf_unfiltered (gdb_stdlog, 475 "pdc_write_data (user = %ld, buf = 0x%lx, addr = %s, len = %ld)\n", 476 user, (long) buf, hex_string (addr), len); 477 478 status = target_write_memory (addr, buf, len); 479 ret = status == 0 ? PDC_SUCCESS : PDC_FAILURE; 480 481 if (debug_aix_thread) 482 fprintf_unfiltered (gdb_stdlog, " status=%d, returning %s\n", status, 483 pd_status2str (ret)); 484 return ret; 485} 486 487/* pthdb callback: allocate a LEN-byte buffer and store a pointer to it 488 in BUFP. */ 489 490static int 491pdc_alloc (pthdb_user_t user, size_t len, void **bufp) 492{ 493 if (debug_aix_thread) 494 fprintf_unfiltered (gdb_stdlog, 495 "pdc_alloc (user = %ld, len = %ld, bufp = 0x%lx)\n", 496 user, len, (long) bufp); 497 *bufp = xmalloc (len); 498 if (debug_aix_thread) 499 fprintf_unfiltered (gdb_stdlog, 500 " malloc returned 0x%lx\n", (long) *bufp); 501 502 /* Note: xmalloc() can't return 0; therefore PDC_FAILURE will never 503 be returned. */ 504 505 return *bufp ? PDC_SUCCESS : PDC_FAILURE; 506} 507 508/* pthdb callback: reallocate BUF, which was allocated by the alloc or 509 realloc callback, so that it contains LEN bytes, and store a 510 pointer to the result in BUFP. */ 511 512static int 513pdc_realloc (pthdb_user_t user, void *buf, size_t len, void **bufp) 514{ 515 if (debug_aix_thread) 516 fprintf_unfiltered (gdb_stdlog, 517 "pdc_realloc (user = %ld, buf = 0x%lx, len = %ld, bufp = 0x%lx)\n", 518 user, (long) buf, len, (long) bufp); 519 *bufp = xrealloc (buf, len); 520 if (debug_aix_thread) 521 fprintf_unfiltered (gdb_stdlog, 522 " realloc returned 0x%lx\n", (long) *bufp); 523 return *bufp ? PDC_SUCCESS : PDC_FAILURE; 524} 525 526/* pthdb callback: free BUF, which was allocated by the alloc or 527 realloc callback. */ 528 529static int 530pdc_dealloc (pthdb_user_t user, void *buf) 531{ 532 if (debug_aix_thread) 533 fprintf_unfiltered (gdb_stdlog, 534 "pdc_free (user = %ld, buf = 0x%lx)\n", user, 535 (long) buf); 536 xfree (buf); 537 return PDC_SUCCESS; 538} 539 540/* Return a printable representation of pthread STATE. */ 541 542static char * 543state2str (pthdb_state_t state) 544{ 545 switch (state) 546 { 547 case PST_IDLE: 548 /* i18n: Like "Thread-Id %d, [state] idle" */ 549 return _("idle"); /* being created */ 550 case PST_RUN: 551 /* i18n: Like "Thread-Id %d, [state] running" */ 552 return _("running"); /* running */ 553 case PST_SLEEP: 554 /* i18n: Like "Thread-Id %d, [state] sleeping" */ 555 return _("sleeping"); /* awaiting an event */ 556 case PST_READY: 557 /* i18n: Like "Thread-Id %d, [state] ready" */ 558 return _("ready"); /* runnable */ 559 case PST_TERM: 560 /* i18n: Like "Thread-Id %d, [state] finished" */ 561 return _("finished"); /* awaiting a join/detach */ 562 default: 563 /* i18n: Like "Thread-Id %d, [state] unknown" */ 564 return _("unknown"); 565 } 566} 567 568/* qsort() comparison function for sorting pd_thread structs by pthid. */ 569 570static int 571pcmp (const void *p1v, const void *p2v) 572{ 573 struct pd_thread *p1 = (struct pd_thread *) p1v; 574 struct pd_thread *p2 = (struct pd_thread *) p2v; 575 return p1->pthid < p2->pthid ? -1 : p1->pthid > p2->pthid; 576} 577 578/* iterate_over_threads() callback for counting GDB threads. */ 579 580static int 581giter_count (struct thread_info *thread, void *countp) 582{ 583 (*(int *) countp)++; 584 return 0; 585} 586 587/* iterate_over_threads() callback for accumulating GDB thread pids. */ 588 589static int 590giter_accum (struct thread_info *thread, void *bufp) 591{ 592 **(struct thread_info ***) bufp = thread; 593 (*(struct thread_info ***) bufp)++; 594 return 0; 595} 596 597/* ptid comparison function */ 598 599static int 600ptid_cmp (ptid_t ptid1, ptid_t ptid2) 601{ 602 int pid1, pid2; 603 604 if (ptid_get_pid (ptid1) < ptid_get_pid (ptid2)) 605 return -1; 606 else if (ptid_get_pid (ptid1) > ptid_get_pid (ptid2)) 607 return 1; 608 else if (ptid_get_tid (ptid1) < ptid_get_tid (ptid2)) 609 return -1; 610 else if (ptid_get_tid (ptid1) > ptid_get_tid (ptid2)) 611 return 1; 612 else if (ptid_get_lwp (ptid1) < ptid_get_lwp (ptid2)) 613 return -1; 614 else if (ptid_get_lwp (ptid1) > ptid_get_lwp (ptid2)) 615 return 1; 616 else 617 return 0; 618} 619 620/* qsort() comparison function for sorting thread_info structs by pid. */ 621 622static int 623gcmp (const void *t1v, const void *t2v) 624{ 625 struct thread_info *t1 = *(struct thread_info **) t1v; 626 struct thread_info *t2 = *(struct thread_info **) t2v; 627 return ptid_cmp (t1->ptid, t2->ptid); 628} 629 630/* Search through the list of all kernel threads for the thread 631 that has stopped on a SIGTRAP signal, and return its TID. 632 Return 0 if none found. */ 633 634static pthdb_tid_t 635get_signaled_thread (void) 636{ 637 struct thrdsinfo64 thrinf; 638 pthdb_tid_t ktid = 0; 639 int result = 0; 640 641 /* getthrds(3) isn't prototyped in any AIX 4.3.3 #include file. */ 642 extern int getthrds (pid_t, struct thrdsinfo64 *, 643 int, pthdb_tid_t *, int); 644 645 while (1) 646 { 647 if (getthrds (PIDGET (inferior_ptid), &thrinf, 648 sizeof (thrinf), &ktid, 1) != 1) 649 break; 650 651 if (thrinf.ti_cursig == SIGTRAP) 652 return thrinf.ti_tid; 653 } 654 655 /* Didn't find any thread stopped on a SIGTRAP signal. */ 656 return 0; 657} 658 659/* Synchronize GDB's thread list with libpthdebug's. 660 661 There are some benefits of doing this every time the inferior stops: 662 663 - allows users to run thread-specific commands without needing to 664 run "info threads" first 665 666 - helps pthdb_tid_pthread() work properly (see "libpthdebug 667 peculiarities" at the top of this module) 668 669 - simplifies the demands placed on libpthdebug, which seems to 670 have difficulty with certain call patterns */ 671 672static void 673sync_threadlists (void) 674{ 675 int cmd, status, infpid; 676 int pcount, psize, pi, gcount, gi; 677 struct pd_thread *pbuf; 678 struct thread_info **gbuf, **g, *thread; 679 pthdb_pthread_t pdtid; 680 pthread_t pthid; 681 pthdb_tid_t tid; 682 683 /* Accumulate an array of libpthdebug threads sorted by pthread id. */ 684 685 pcount = 0; 686 psize = 1; 687 pbuf = (struct pd_thread *) xmalloc (psize * sizeof *pbuf); 688 689 for (cmd = PTHDB_LIST_FIRST;; cmd = PTHDB_LIST_NEXT) 690 { 691 status = pthdb_pthread (pd_session, &pdtid, cmd); 692 if (status != PTHDB_SUCCESS || pdtid == PTHDB_INVALID_PTHREAD) 693 break; 694 695 status = pthdb_pthread_ptid (pd_session, pdtid, &pthid); 696 if (status != PTHDB_SUCCESS || pthid == PTHDB_INVALID_PTID) 697 continue; 698 699 if (pcount == psize) 700 { 701 psize *= 2; 702 pbuf = (struct pd_thread *) xrealloc (pbuf, 703 psize * sizeof *pbuf); 704 } 705 pbuf[pcount].pdtid = pdtid; 706 pbuf[pcount].pthid = pthid; 707 pcount++; 708 } 709 710 for (pi = 0; pi < pcount; pi++) 711 { 712 status = pthdb_pthread_tid (pd_session, pbuf[pi].pdtid, &tid); 713 if (status != PTHDB_SUCCESS) 714 tid = PTHDB_INVALID_TID; 715 pbuf[pi].tid = tid; 716 } 717 718 qsort (pbuf, pcount, sizeof *pbuf, pcmp); 719 720 /* Accumulate an array of GDB threads sorted by pid. */ 721 722 gcount = 0; 723 iterate_over_threads (giter_count, &gcount); 724 g = gbuf = (struct thread_info **) xmalloc (gcount * sizeof *gbuf); 725 iterate_over_threads (giter_accum, &g); 726 qsort (gbuf, gcount, sizeof *gbuf, gcmp); 727 728 /* Apply differences between the two arrays to GDB's thread list. */ 729 730 infpid = PIDGET (inferior_ptid); 731 for (pi = gi = 0; pi < pcount || gi < gcount;) 732 { 733 if (pi == pcount) 734 { 735 delete_thread (gbuf[gi]->ptid); 736 gi++; 737 } 738 else if (gi == gcount) 739 { 740 thread = add_thread (BUILD_THREAD (pbuf[pi].pthid, infpid)); 741 thread->private = xmalloc (sizeof (struct private_thread_info)); 742 thread->private->pdtid = pbuf[pi].pdtid; 743 thread->private->tid = pbuf[pi].tid; 744 pi++; 745 } 746 else 747 { 748 ptid_t pptid, gptid; 749 int cmp_result; 750 751 pptid = BUILD_THREAD (pbuf[pi].pthid, infpid); 752 gptid = gbuf[gi]->ptid; 753 pdtid = pbuf[pi].pdtid; 754 tid = pbuf[pi].tid; 755 756 cmp_result = ptid_cmp (pptid, gptid); 757 758 if (cmp_result == 0) 759 { 760 gbuf[gi]->private->pdtid = pdtid; 761 gbuf[gi]->private->tid = tid; 762 pi++; 763 gi++; 764 } 765 else if (cmp_result > 0) 766 { 767 delete_thread (gptid); 768 gi++; 769 } 770 else 771 { 772 thread = add_thread (pptid); 773 thread->private = xmalloc (sizeof (struct private_thread_info)); 774 thread->private->pdtid = pdtid; 775 thread->private->tid = tid; 776 pi++; 777 } 778 } 779 } 780 781 xfree (pbuf); 782 xfree (gbuf); 783} 784 785/* Iterate_over_threads() callback for locating a thread, using 786 the TID of its associated kernel thread. */ 787 788static int 789iter_tid (struct thread_info *thread, void *tidp) 790{ 791 const pthdb_tid_t tid = *(pthdb_tid_t *)tidp; 792 793 return (thread->private->tid == tid); 794} 795 796/* Synchronize libpthdebug's state with the inferior and with GDB, 797 generate a composite process/thread <pid> for the current thread, 798 set inferior_ptid to <pid> if SET_INFPID, and return <pid>. */ 799 800static ptid_t 801pd_update (int set_infpid) 802{ 803 int status; 804 ptid_t ptid; 805 pthdb_tid_t tid; 806 struct thread_info *thread = NULL; 807 808 if (!pd_active) 809 return inferior_ptid; 810 811 status = pthdb_session_update (pd_session); 812 if (status != PTHDB_SUCCESS) 813 return inferior_ptid; 814 815 sync_threadlists (); 816 817 /* Define "current thread" as one that just received a trap signal. */ 818 819 tid = get_signaled_thread (); 820 if (tid != 0) 821 thread = iterate_over_threads (iter_tid, &tid); 822 if (!thread) 823 ptid = inferior_ptid; 824 else 825 { 826 ptid = thread->ptid; 827 if (set_infpid) 828 inferior_ptid = ptid; 829 } 830 return ptid; 831} 832 833/* Try to start debugging threads in the current process. 834 If successful and SET_INFPID, set inferior_ptid to reflect the 835 current thread. */ 836 837static ptid_t 838pd_activate (int set_infpid) 839{ 840 int status; 841 842 status = pthdb_session_init (PD_USER, arch64 ? PEM_64BIT : PEM_32BIT, 843 PTHDB_FLAG_REGS, &pd_callbacks, 844 &pd_session); 845 if (status != PTHDB_SUCCESS) 846 { 847 return inferior_ptid; 848 } 849 pd_active = 1; 850 return pd_update (set_infpid); 851} 852 853/* Undo the effects of pd_activate(). */ 854 855static void 856pd_deactivate (void) 857{ 858 if (!pd_active) 859 return; 860 pthdb_session_destroy (pd_session); 861 862 pid_to_prc (&inferior_ptid); 863 pd_active = 0; 864} 865 866/* An object file has just been loaded. Check whether the current 867 application is pthreaded, and if so, prepare for thread debugging. */ 868 869static void 870pd_enable (void) 871{ 872 int status; 873 char *stub_name; 874 struct minimal_symbol *ms; 875 876 /* Don't initialize twice. */ 877 if (pd_able) 878 return; 879 880 /* Check application word size. */ 881 arch64 = register_size (current_gdbarch, 0) == 8; 882 883 /* Check whether the application is pthreaded. */ 884 stub_name = NULL; 885 status = pthdb_session_pthreaded (PD_USER, PTHDB_FLAG_REGS, 886 &pd_callbacks, &stub_name); 887 if ((status != PTHDB_SUCCESS && 888 status != PTHDB_NOT_PTHREADED) || !stub_name) 889 return; 890 891 /* Set a breakpoint on the returned stub function. */ 892 if (!(ms = lookup_minimal_symbol (stub_name, NULL, NULL))) 893 return; 894 pd_brk_addr = SYMBOL_VALUE_ADDRESS (ms); 895 if (!create_thread_event_breakpoint (pd_brk_addr)) 896 return; 897 898 /* Prepare for thread debugging. */ 899 base_target = current_target; 900 push_target (&aix_thread_ops); 901 pd_able = 1; 902 903 /* If we're debugging a core file or an attached inferior, the 904 pthread library may already have been initialized, so try to 905 activate thread debugging. */ 906 pd_activate (1); 907} 908 909/* Undo the effects of pd_enable(). */ 910 911static void 912pd_disable (void) 913{ 914 if (!pd_able) 915 return; 916 if (pd_active) 917 pd_deactivate (); 918 pd_able = 0; 919 unpush_target (&aix_thread_ops); 920} 921 922/* new_objfile observer callback. 923 924 If OBJFILE is non-null, check whether a threaded application is 925 being debugged, and if so, prepare for thread debugging. 926 927 If OBJFILE is null, stop debugging threads. */ 928 929static void 930new_objfile (struct objfile *objfile) 931{ 932 if (objfile) 933 pd_enable (); 934 else 935 pd_disable (); 936} 937 938/* Attach to process specified by ARGS. */ 939 940static void 941aix_thread_attach (char *args, int from_tty) 942{ 943 base_target.to_attach (args, from_tty); 944 pd_activate (1); 945} 946 947/* Detach from the process attached to by aix_thread_attach(). */ 948 949static void 950aix_thread_detach (char *args, int from_tty) 951{ 952 pd_disable (); 953 base_target.to_detach (args, from_tty); 954} 955 956/* Tell the inferior process to continue running thread PID if != -1 957 and all threads otherwise. */ 958 959static void 960aix_thread_resume (ptid_t ptid, int step, enum target_signal sig) 961{ 962 struct thread_info *thread; 963 pthdb_tid_t tid[2]; 964 965 if (!PD_TID (ptid)) 966 { 967 struct cleanup *cleanup = save_inferior_ptid (); 968 inferior_ptid = pid_to_ptid (PIDGET (inferior_ptid)); 969 base_target.to_resume (ptid, step, sig); 970 do_cleanups (cleanup); 971 } 972 else 973 { 974 thread = find_thread_pid (ptid); 975 if (!thread) 976 error (_("aix-thread resume: unknown pthread %ld"), 977 TIDGET (ptid)); 978 979 tid[0] = thread->private->tid; 980 if (tid[0] == PTHDB_INVALID_TID) 981 error (_("aix-thread resume: no tid for pthread %ld"), 982 TIDGET (ptid)); 983 tid[1] = 0; 984 985 if (arch64) 986 ptrace64aix (PTT_CONTINUE, tid[0], 1, 987 target_signal_to_host (sig), (int *) tid); 988 else 989 ptrace32 (PTT_CONTINUE, tid[0], (int *) 1, 990 target_signal_to_host (sig), (int *) tid); 991 } 992} 993 994/* Wait for thread/process ID if != -1 or for any thread otherwise. 995 If an error occurs, return -1, else return the pid of the stopped 996 thread. */ 997 998static ptid_t 999aix_thread_wait (ptid_t ptid, struct target_waitstatus *status) 1000{ 1001 struct cleanup *cleanup = save_inferior_ptid (); 1002 1003 pid_to_prc (&ptid); 1004 1005 inferior_ptid = pid_to_ptid (PIDGET (inferior_ptid)); 1006 ptid = base_target.to_wait (ptid, status); 1007 do_cleanups (cleanup); 1008 1009 if (PIDGET (ptid) == -1) 1010 return pid_to_ptid (-1); 1011 1012 /* Check whether libpthdebug might be ready to be initialized. */ 1013 if (!pd_active && status->kind == TARGET_WAITKIND_STOPPED && 1014 status->value.sig == TARGET_SIGNAL_TRAP 1015 && read_pc_pid (ptid) 1016 - gdbarch_decr_pc_after_break (current_gdbarch) == pd_brk_addr) 1017 return pd_activate (0); 1018 1019 return pd_update (0); 1020} 1021 1022/* Record that the 64-bit general-purpose registers contain VALS. */ 1023 1024static void 1025supply_gprs64 (struct regcache *regcache, uint64_t *vals) 1026{ 1027 struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch); 1028 int regno; 1029 1030 for (regno = 0; regno < ppc_num_gprs; regno++) 1031 regcache_raw_supply (regcache, tdep->ppc_gp0_regnum + regno, 1032 (char *) (vals + regno)); 1033} 1034 1035/* Record that 32-bit register REGNO contains VAL. */ 1036 1037static void 1038supply_reg32 (struct regcache *regcache, int regno, uint32_t val) 1039{ 1040 regcache_raw_supply (regcache, regno, (char *) &val); 1041} 1042 1043/* Record that the floating-point registers contain VALS. */ 1044 1045static void 1046supply_fprs (struct regcache *regcache, double *vals) 1047{ 1048 struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch); 1049 int regno; 1050 1051 /* This function should never be called on architectures without 1052 floating-point registers. */ 1053 gdb_assert (ppc_floating_point_unit_p (current_gdbarch)); 1054 1055 for (regno = 0; regno < ppc_num_fprs; regno++) 1056 regcache_raw_supply (regcache, regno + tdep->ppc_fp0_regnum, 1057 (char *) (vals + regno)); 1058} 1059 1060/* Predicate to test whether given register number is a "special" register. */ 1061static int 1062special_register_p (int regno) 1063{ 1064 struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch); 1065 1066 return regno == gdbarch_pc_regnum (current_gdbarch) 1067 || regno == tdep->ppc_ps_regnum 1068 || regno == tdep->ppc_cr_regnum 1069 || regno == tdep->ppc_lr_regnum 1070 || regno == tdep->ppc_ctr_regnum 1071 || regno == tdep->ppc_xer_regnum 1072 || (tdep->ppc_fpscr_regnum >= 0 && regno == tdep->ppc_fpscr_regnum) 1073 || (tdep->ppc_mq_regnum >= 0 && regno == tdep->ppc_mq_regnum); 1074} 1075 1076 1077/* Record that the special registers contain the specified 64-bit and 1078 32-bit values. */ 1079 1080static void 1081supply_sprs64 (struct regcache *regcache, 1082 uint64_t iar, uint64_t msr, uint32_t cr, 1083 uint64_t lr, uint64_t ctr, uint32_t xer, 1084 uint32_t fpscr) 1085{ 1086 struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch); 1087 1088 regcache_raw_supply (regcache, gdbarch_pc_regnum (current_gdbarch), 1089 (char *) &iar); 1090 regcache_raw_supply (regcache, tdep->ppc_ps_regnum, (char *) &msr); 1091 regcache_raw_supply (regcache, tdep->ppc_cr_regnum, (char *) &cr); 1092 regcache_raw_supply (regcache, tdep->ppc_lr_regnum, (char *) &lr); 1093 regcache_raw_supply (regcache, tdep->ppc_ctr_regnum, (char *) &ctr); 1094 regcache_raw_supply (regcache, tdep->ppc_xer_regnum, (char *) &xer); 1095 if (tdep->ppc_fpscr_regnum >= 0) 1096 regcache_raw_supply (regcache, tdep->ppc_fpscr_regnum, 1097 (char *) &fpscr); 1098} 1099 1100/* Record that the special registers contain the specified 32-bit 1101 values. */ 1102 1103static void 1104supply_sprs32 (struct regcache *regcache, 1105 uint32_t iar, uint32_t msr, uint32_t cr, 1106 uint32_t lr, uint32_t ctr, uint32_t xer, 1107 uint32_t fpscr) 1108{ 1109 struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch); 1110 1111 regcache_raw_supply (regcache, gdbarch_pc_regnum (current_gdbarch), 1112 (char *) &iar); 1113 regcache_raw_supply (regcache, tdep->ppc_ps_regnum, (char *) &msr); 1114 regcache_raw_supply (regcache, tdep->ppc_cr_regnum, (char *) &cr); 1115 regcache_raw_supply (regcache, tdep->ppc_lr_regnum, (char *) &lr); 1116 regcache_raw_supply (regcache, tdep->ppc_ctr_regnum, (char *) &ctr); 1117 regcache_raw_supply (regcache, tdep->ppc_xer_regnum, (char *) &xer); 1118 if (tdep->ppc_fpscr_regnum >= 0) 1119 regcache_raw_supply (regcache, tdep->ppc_fpscr_regnum, 1120 (char *) &fpscr); 1121} 1122 1123/* Fetch all registers from pthread PDTID, which doesn't have a kernel 1124 thread. 1125 1126 There's no way to query a single register from a non-kernel 1127 pthread, so there's no need for a single-register version of this 1128 function. */ 1129 1130static void 1131fetch_regs_user_thread (struct regcache *regcache, pthdb_pthread_t pdtid) 1132{ 1133 struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch); 1134 int status, i; 1135 pthdb_context_t ctx; 1136 1137 if (debug_aix_thread) 1138 fprintf_unfiltered (gdb_stdlog, 1139 "fetch_regs_user_thread %lx\n", (long) pdtid); 1140 status = pthdb_pthread_context (pd_session, pdtid, &ctx); 1141 if (status != PTHDB_SUCCESS) 1142 error (_("aix-thread: fetch_registers: pthdb_pthread_context returned %s"), 1143 pd_status2str (status)); 1144 1145 /* General-purpose registers. */ 1146 1147 if (arch64) 1148 supply_gprs64 (regcache, ctx.gpr); 1149 else 1150 for (i = 0; i < ppc_num_gprs; i++) 1151 supply_reg32 (regcache, tdep->ppc_gp0_regnum + i, ctx.gpr[i]); 1152 1153 /* Floating-point registers. */ 1154 1155 if (ppc_floating_point_unit_p (current_gdbarch)) 1156 supply_fprs (regcache, ctx.fpr); 1157 1158 /* Special registers. */ 1159 1160 if (arch64) 1161 supply_sprs64 (regcache, ctx.iar, ctx.msr, ctx.cr, ctx.lr, ctx.ctr, 1162 ctx.xer, ctx.fpscr); 1163 else 1164 supply_sprs32 (regcache, ctx.iar, ctx.msr, ctx.cr, ctx.lr, ctx.ctr, 1165 ctx.xer, ctx.fpscr); 1166} 1167 1168/* Fetch register REGNO if != -1 or all registers otherwise from 1169 kernel thread TID. 1170 1171 AIX provides a way to query all of a kernel thread's GPRs, FPRs, or 1172 SPRs, but there's no way to query individual registers within those 1173 groups. Therefore, if REGNO != -1, this function fetches an entire 1174 group. 1175 1176 Unfortunately, kernel thread register queries often fail with 1177 EPERM, indicating that the thread is in kernel space. This breaks 1178 backtraces of threads other than the current one. To make that 1179 breakage obvious without throwing an error to top level (which is 1180 bad e.g. during "info threads" output), zero registers that can't 1181 be retrieved. */ 1182 1183static void 1184fetch_regs_kernel_thread (struct regcache *regcache, int regno, 1185 pthdb_tid_t tid) 1186{ 1187 struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch); 1188 uint64_t gprs64[ppc_num_gprs]; 1189 uint32_t gprs32[ppc_num_gprs]; 1190 double fprs[ppc_num_fprs]; 1191 struct ptxsprs sprs64; 1192 struct ptsprs sprs32; 1193 int i; 1194 1195 if (debug_aix_thread) 1196 fprintf_unfiltered (gdb_stdlog, 1197 "fetch_regs_kernel_thread tid=%lx regno=%d arch64=%d\n", 1198 (long) tid, regno, arch64); 1199 1200 /* General-purpose registers. */ 1201 if (regno == -1 1202 || (tdep->ppc_gp0_regnum <= regno 1203 && regno < tdep->ppc_gp0_regnum + ppc_num_gprs)) 1204 { 1205 if (arch64) 1206 { 1207 if (!ptrace64aix (PTT_READ_GPRS, tid, 1208 (unsigned long) gprs64, 0, NULL)) 1209 memset (gprs64, 0, sizeof (gprs64)); 1210 supply_gprs64 (regcache, gprs64); 1211 } 1212 else 1213 { 1214 if (!ptrace32 (PTT_READ_GPRS, tid, gprs32, 0, NULL)) 1215 memset (gprs32, 0, sizeof (gprs32)); 1216 for (i = 0; i < ppc_num_gprs; i++) 1217 supply_reg32 (regcache, tdep->ppc_gp0_regnum + i, gprs32[i]); 1218 } 1219 } 1220 1221 /* Floating-point registers. */ 1222 1223 if (ppc_floating_point_unit_p (current_gdbarch) 1224 && (regno == -1 1225 || (regno >= tdep->ppc_fp0_regnum 1226 && regno < tdep->ppc_fp0_regnum + ppc_num_fprs))) 1227 { 1228 if (!ptrace32 (PTT_READ_FPRS, tid, (int *) fprs, 0, NULL)) 1229 memset (fprs, 0, sizeof (fprs)); 1230 supply_fprs (regcache, fprs); 1231 } 1232 1233 /* Special-purpose registers. */ 1234 1235 if (regno == -1 || special_register_p (regno)) 1236 { 1237 if (arch64) 1238 { 1239 if (!ptrace64aix (PTT_READ_SPRS, tid, 1240 (unsigned long) &sprs64, 0, NULL)) 1241 memset (&sprs64, 0, sizeof (sprs64)); 1242 supply_sprs64 (regcache, sprs64.pt_iar, sprs64.pt_msr, 1243 sprs64.pt_cr, sprs64.pt_lr, sprs64.pt_ctr, 1244 sprs64.pt_xer, sprs64.pt_fpscr); 1245 } 1246 else 1247 { 1248 struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch); 1249 1250 if (!ptrace32 (PTT_READ_SPRS, tid, (int *) &sprs32, 0, NULL)) 1251 memset (&sprs32, 0, sizeof (sprs32)); 1252 supply_sprs32 (regcache, sprs32.pt_iar, sprs32.pt_msr, sprs32.pt_cr, 1253 sprs32.pt_lr, sprs32.pt_ctr, sprs32.pt_xer, 1254 sprs32.pt_fpscr); 1255 1256 if (tdep->ppc_mq_regnum >= 0) 1257 regcache_raw_supply (regcache, tdep->ppc_mq_regnum, 1258 (char *) &sprs32.pt_mq); 1259 } 1260 } 1261} 1262 1263/* Fetch register REGNO if != -1 or all registers otherwise in the 1264 thread/process specified by inferior_ptid. */ 1265 1266static void 1267aix_thread_fetch_registers (struct regcache *regcache, int regno) 1268{ 1269 struct thread_info *thread; 1270 pthdb_tid_t tid; 1271 1272 if (!PD_TID (inferior_ptid)) 1273 base_target.to_fetch_registers (regcache, regno); 1274 else 1275 { 1276 thread = find_thread_pid (inferior_ptid); 1277 tid = thread->private->tid; 1278 1279 if (tid == PTHDB_INVALID_TID) 1280 fetch_regs_user_thread (regcache, thread->private->pdtid); 1281 else 1282 fetch_regs_kernel_thread (regcache, regno, tid); 1283 } 1284} 1285 1286/* Store the gp registers into an array of uint32_t or uint64_t. */ 1287 1288static void 1289fill_gprs64 (const struct regcache *regcache, uint64_t *vals) 1290{ 1291 struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch); 1292 int regno; 1293 1294 for (regno = 0; regno < ppc_num_gprs; regno++) 1295 if (regcache_valid_p (regcache, tdep->ppc_gp0_regnum + regno)) 1296 regcache_raw_collect (regcache, tdep->ppc_gp0_regnum + regno, 1297 vals + regno); 1298} 1299 1300static void 1301fill_gprs32 (const struct regcache *regcache, uint32_t *vals) 1302{ 1303 struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch); 1304 int regno; 1305 1306 for (regno = 0; regno < ppc_num_gprs; regno++) 1307 if (regcache_valid_p (regcache, tdep->ppc_gp0_regnum + regno)) 1308 regcache_raw_collect (regcache, tdep->ppc_gp0_regnum + regno, 1309 vals + regno); 1310} 1311 1312/* Store the floating point registers into a double array. */ 1313static void 1314fill_fprs (const struct regcache *regcache, double *vals) 1315{ 1316 struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch); 1317 int regno; 1318 1319 /* This function should never be called on architectures without 1320 floating-point registers. */ 1321 gdb_assert (ppc_floating_point_unit_p (current_gdbarch)); 1322 1323 for (regno = tdep->ppc_fp0_regnum; 1324 regno < tdep->ppc_fp0_regnum + ppc_num_fprs; 1325 regno++) 1326 if (regcache_valid_p (regcache, regno)) 1327 regcache_raw_collect (regcache, regno, vals + regno); 1328} 1329 1330/* Store the special registers into the specified 64-bit and 32-bit 1331 locations. */ 1332 1333static void 1334fill_sprs64 (const struct regcache *regcache, 1335 uint64_t *iar, uint64_t *msr, uint32_t *cr, 1336 uint64_t *lr, uint64_t *ctr, uint32_t *xer, 1337 uint32_t *fpscr) 1338{ 1339 struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch); 1340 1341 /* Verify that the size of the size of the IAR buffer is the 1342 same as the raw size of the PC (in the register cache). If 1343 they're not, then either GDB has been built incorrectly, or 1344 there's some other kind of internal error. To be really safe, 1345 we should check all of the sizes. */ 1346 gdb_assert (sizeof (*iar) == register_size 1347 (current_gdbarch, 1348 gdbarch_pc_regnum (current_gdbarch))); 1349 1350 if (regcache_valid_p (regcache, gdbarch_pc_regnum (current_gdbarch))) 1351 regcache_raw_collect (regcache, gdbarch_pc_regnum (current_gdbarch), iar); 1352 if (regcache_valid_p (regcache, tdep->ppc_ps_regnum)) 1353 regcache_raw_collect (regcache, tdep->ppc_ps_regnum, msr); 1354 if (regcache_valid_p (regcache, tdep->ppc_cr_regnum)) 1355 regcache_raw_collect (regcache, tdep->ppc_cr_regnum, cr); 1356 if (regcache_valid_p (regcache, tdep->ppc_lr_regnum)) 1357 regcache_raw_collect (regcache, tdep->ppc_lr_regnum, lr); 1358 if (regcache_valid_p (regcache, tdep->ppc_ctr_regnum)) 1359 regcache_raw_collect (regcache, tdep->ppc_ctr_regnum, ctr); 1360 if (regcache_valid_p (regcache, tdep->ppc_xer_regnum)) 1361 regcache_raw_collect (regcache, tdep->ppc_xer_regnum, xer); 1362 if (tdep->ppc_fpscr_regnum >= 0 1363 && regcache_valid_p (regcache, tdep->ppc_fpscr_regnum)) 1364 regcache_raw_collect (regcache, tdep->ppc_fpscr_regnum, fpscr); 1365} 1366 1367static void 1368fill_sprs32 (const struct regcache *regcache, 1369 uint32_t *iar, uint32_t *msr, uint32_t *cr, 1370 uint32_t *lr, uint32_t *ctr, uint32_t *xer, 1371 uint32_t *fpscr) 1372{ 1373 struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch); 1374 1375 /* Verify that the size of the size of the IAR buffer is the 1376 same as the raw size of the PC (in the register cache). If 1377 they're not, then either GDB has been built incorrectly, or 1378 there's some other kind of internal error. To be really safe, 1379 we should check all of the sizes. */ 1380 gdb_assert (sizeof (*iar) == register_size (current_gdbarch, 1381 gdbarch_pc_regnum 1382 (current_gdbarch))); 1383 1384 if (regcache_valid_p (regcache, gdbarch_pc_regnum (current_gdbarch))) 1385 regcache_raw_collect (regcache, gdbarch_pc_regnum (current_gdbarch), iar); 1386 if (regcache_valid_p (regcache, tdep->ppc_ps_regnum)) 1387 regcache_raw_collect (regcache, tdep->ppc_ps_regnum, msr); 1388 if (regcache_valid_p (regcache, tdep->ppc_cr_regnum)) 1389 regcache_raw_collect (regcache, tdep->ppc_cr_regnum, cr); 1390 if (regcache_valid_p (regcache, tdep->ppc_lr_regnum)) 1391 regcache_raw_collect (regcache, tdep->ppc_lr_regnum, lr); 1392 if (regcache_valid_p (regcache, tdep->ppc_ctr_regnum)) 1393 regcache_raw_collect (regcache, tdep->ppc_ctr_regnum, ctr); 1394 if (regcache_valid_p (regcache, tdep->ppc_xer_regnum)) 1395 regcache_raw_collect (regcache, tdep->ppc_xer_regnum, xer); 1396 if (tdep->ppc_fpscr_regnum >= 0 1397 && regcache_valid_p (regcache, tdep->ppc_fpscr_regnum)) 1398 regcache_raw_collect (regcache, tdep->ppc_fpscr_regnum, fpscr); 1399} 1400 1401/* Store all registers into pthread PDTID, which doesn't have a kernel 1402 thread. 1403 1404 It's possible to store a single register into a non-kernel pthread, 1405 but I doubt it's worth the effort. */ 1406 1407static void 1408store_regs_user_thread (const struct regcache *regcache, pthdb_pthread_t pdtid) 1409{ 1410 struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch); 1411 int status, i; 1412 pthdb_context_t ctx; 1413 uint32_t int32; 1414 uint64_t int64; 1415 double dbl; 1416 1417 if (debug_aix_thread) 1418 fprintf_unfiltered (gdb_stdlog, 1419 "store_regs_user_thread %lx\n", (long) pdtid); 1420 1421 /* Retrieve the thread's current context for its non-register 1422 values. */ 1423 status = pthdb_pthread_context (pd_session, pdtid, &ctx); 1424 if (status != PTHDB_SUCCESS) 1425 error (_("aix-thread: store_registers: pthdb_pthread_context returned %s"), 1426 pd_status2str (status)); 1427 1428 /* Collect general-purpose register values from the regcache. */ 1429 1430 for (i = 0; i < ppc_num_gprs; i++) 1431 if (regcache_valid_p (regcache, tdep->ppc_gp0_regnum + i)) 1432 { 1433 if (arch64) 1434 { 1435 regcache_raw_collect (regcache, tdep->ppc_gp0_regnum + i, 1436 (void *) &int64); 1437 ctx.gpr[i] = int64; 1438 } 1439 else 1440 { 1441 regcache_raw_collect (regcache, tdep->ppc_gp0_regnum + i, 1442 (void *) &int32); 1443 ctx.gpr[i] = int32; 1444 } 1445 } 1446 1447 /* Collect floating-point register values from the regcache. */ 1448 if (ppc_floating_point_unit_p (current_gdbarch)) 1449 fill_fprs (regcache, ctx.fpr); 1450 1451 /* Special registers (always kept in ctx as 64 bits). */ 1452 if (arch64) 1453 { 1454 fill_sprs64 (regcache, &ctx.iar, &ctx.msr, &ctx.cr, &ctx.lr, &ctx.ctr, 1455 &ctx.xer, &ctx.fpscr); 1456 } 1457 else 1458 { 1459 /* Problem: ctx.iar etc. are 64 bits, but raw_registers are 32. 1460 Solution: use 32-bit temp variables. */ 1461 uint32_t tmp_iar, tmp_msr, tmp_cr, tmp_lr, tmp_ctr, tmp_xer, 1462 tmp_fpscr; 1463 1464 fill_sprs32 (regcache, &tmp_iar, &tmp_msr, &tmp_cr, &tmp_lr, &tmp_ctr, 1465 &tmp_xer, &tmp_fpscr); 1466 if (regcache_valid_p (regcache, gdbarch_pc_regnum (current_gdbarch))) 1467 ctx.iar = tmp_iar; 1468 if (regcache_valid_p (regcache, tdep->ppc_ps_regnum)) 1469 ctx.msr = tmp_msr; 1470 if (regcache_valid_p (regcache, tdep->ppc_cr_regnum)) 1471 ctx.cr = tmp_cr; 1472 if (regcache_valid_p (regcache, tdep->ppc_lr_regnum)) 1473 ctx.lr = tmp_lr; 1474 if (regcache_valid_p (regcache, tdep->ppc_ctr_regnum)) 1475 ctx.ctr = tmp_ctr; 1476 if (regcache_valid_p (regcache, tdep->ppc_xer_regnum)) 1477 ctx.xer = tmp_xer; 1478 if (regcache_valid_p (regcache, tdep->ppc_xer_regnum)) 1479 ctx.fpscr = tmp_fpscr; 1480 } 1481 1482 status = pthdb_pthread_setcontext (pd_session, pdtid, &ctx); 1483 if (status != PTHDB_SUCCESS) 1484 error (_("aix-thread: store_registers: pthdb_pthread_setcontext returned %s"), 1485 pd_status2str (status)); 1486} 1487 1488/* Store register REGNO if != -1 or all registers otherwise into 1489 kernel thread TID. 1490 1491 AIX provides a way to set all of a kernel thread's GPRs, FPRs, or 1492 SPRs, but there's no way to set individual registers within those 1493 groups. Therefore, if REGNO != -1, this function stores an entire 1494 group. */ 1495 1496static void 1497store_regs_kernel_thread (const struct regcache *regcache, int regno, 1498 pthdb_tid_t tid) 1499{ 1500 struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch); 1501 uint64_t gprs64[ppc_num_gprs]; 1502 uint32_t gprs32[ppc_num_gprs]; 1503 double fprs[ppc_num_fprs]; 1504 struct ptxsprs sprs64; 1505 struct ptsprs sprs32; 1506 int i; 1507 1508 if (debug_aix_thread) 1509 fprintf_unfiltered (gdb_stdlog, 1510 "store_regs_kernel_thread tid=%lx regno=%d\n", 1511 (long) tid, regno); 1512 1513 /* General-purpose registers. */ 1514 if (regno == -1 1515 || (tdep->ppc_gp0_regnum <= regno 1516 && regno < tdep->ppc_gp0_regnum + ppc_num_fprs)) 1517 { 1518 if (arch64) 1519 { 1520 /* Pre-fetch: some regs may not be in the cache. */ 1521 ptrace64aix (PTT_READ_GPRS, tid, (unsigned long) gprs64, 0, NULL); 1522 fill_gprs64 (regcache, gprs64); 1523 ptrace64aix (PTT_WRITE_GPRS, tid, (unsigned long) gprs64, 0, NULL); 1524 } 1525 else 1526 { 1527 /* Pre-fetch: some regs may not be in the cache. */ 1528 ptrace32 (PTT_READ_GPRS, tid, gprs32, 0, NULL); 1529 fill_gprs32 (regcache, gprs32); 1530 ptrace32 (PTT_WRITE_GPRS, tid, gprs32, 0, NULL); 1531 } 1532 } 1533 1534 /* Floating-point registers. */ 1535 1536 if (ppc_floating_point_unit_p (current_gdbarch) 1537 && (regno == -1 1538 || (regno >= tdep->ppc_fp0_regnum 1539 && regno < tdep->ppc_fp0_regnum + ppc_num_fprs))) 1540 { 1541 /* Pre-fetch: some regs may not be in the cache. */ 1542 ptrace32 (PTT_READ_FPRS, tid, (int *) fprs, 0, NULL); 1543 fill_fprs (regcache, fprs); 1544 ptrace32 (PTT_WRITE_FPRS, tid, (int *) fprs, 0, NULL); 1545 } 1546 1547 /* Special-purpose registers. */ 1548 1549 if (regno == -1 || special_register_p (regno)) 1550 { 1551 if (arch64) 1552 { 1553 /* Pre-fetch: some registers won't be in the cache. */ 1554 ptrace64aix (PTT_READ_SPRS, tid, 1555 (unsigned long) &sprs64, 0, NULL); 1556 fill_sprs64 (regcache, &sprs64.pt_iar, &sprs64.pt_msr, 1557 &sprs64.pt_cr, &sprs64.pt_lr, &sprs64.pt_ctr, 1558 &sprs64.pt_xer, &sprs64.pt_fpscr); 1559 ptrace64aix (PTT_WRITE_SPRS, tid, 1560 (unsigned long) &sprs64, 0, NULL); 1561 } 1562 else 1563 { 1564 /* The contents of "struct ptspr" were declared as "unsigned 1565 long" up to AIX 5.2, but are "unsigned int" since 5.3. 1566 Use temporaries to work around this problem. Also, add an 1567 assert here to make sure we fail if the system header files 1568 use "unsigned long", and the size of that type is not what 1569 the headers expect. */ 1570 uint32_t tmp_iar, tmp_msr, tmp_cr, tmp_lr, tmp_ctr, tmp_xer, 1571 tmp_fpscr; 1572 1573 gdb_assert (sizeof (sprs32.pt_iar) == 4); 1574 1575 /* Pre-fetch: some registers won't be in the cache. */ 1576 ptrace32 (PTT_READ_SPRS, tid, (int *) &sprs32, 0, NULL); 1577 1578 fill_sprs32 (regcache, &tmp_iar, &tmp_msr, &tmp_cr, &tmp_lr, 1579 &tmp_ctr, &tmp_xer, &tmp_fpscr); 1580 1581 sprs32.pt_iar = tmp_iar; 1582 sprs32.pt_msr = tmp_msr; 1583 sprs32.pt_cr = tmp_cr; 1584 sprs32.pt_lr = tmp_lr; 1585 sprs32.pt_ctr = tmp_ctr; 1586 sprs32.pt_xer = tmp_xer; 1587 sprs32.pt_fpscr = tmp_fpscr; 1588 1589 if (tdep->ppc_mq_regnum >= 0) 1590 if (regcache_valid_p (regcache, tdep->ppc_mq_regnum)) 1591 regcache_raw_collect (regcache, tdep->ppc_mq_regnum, 1592 &sprs32.pt_mq); 1593 1594 ptrace32 (PTT_WRITE_SPRS, tid, (int *) &sprs32, 0, NULL); 1595 } 1596 } 1597} 1598 1599/* Store gdb's current view of the register set into the 1600 thread/process specified by inferior_ptid. */ 1601 1602static void 1603aix_thread_store_registers (struct regcache *regcache, int regno) 1604{ 1605 struct thread_info *thread; 1606 pthdb_tid_t tid; 1607 1608 if (!PD_TID (inferior_ptid)) 1609 base_target.to_store_registers (regcache, regno); 1610 else 1611 { 1612 thread = find_thread_pid (inferior_ptid); 1613 tid = thread->private->tid; 1614 1615 if (tid == PTHDB_INVALID_TID) 1616 store_regs_user_thread (regcache, thread->private->pdtid); 1617 else 1618 store_regs_kernel_thread (regcache, regno, tid); 1619 } 1620} 1621 1622/* Attempt a transfer all LEN bytes starting at OFFSET between the 1623 inferior's OBJECT:ANNEX space and GDB's READBUF/WRITEBUF buffer. 1624 Return the number of bytes actually transferred. */ 1625 1626static LONGEST 1627aix_thread_xfer_partial (struct target_ops *ops, enum target_object object, 1628 const char *annex, gdb_byte *readbuf, 1629 const gdb_byte *writebuf, ULONGEST offset, LONGEST len) 1630{ 1631 struct cleanup *old_chain = save_inferior_ptid (); 1632 LONGEST xfer; 1633 1634 inferior_ptid = pid_to_ptid (PIDGET (inferior_ptid)); 1635 xfer = base_target.to_xfer_partial (ops, object, annex, 1636 readbuf, writebuf, offset, len); 1637 1638 do_cleanups (old_chain); 1639 return xfer; 1640} 1641 1642/* Kill and forget about the inferior process. */ 1643 1644static void 1645aix_thread_kill (void) 1646{ 1647 struct cleanup *cleanup = save_inferior_ptid (); 1648 1649 inferior_ptid = pid_to_ptid (PIDGET (inferior_ptid)); 1650 base_target.to_kill (); 1651 do_cleanups (cleanup); 1652} 1653 1654/* Clean up after the inferior exits. */ 1655 1656static void 1657aix_thread_mourn_inferior (void) 1658{ 1659 pd_deactivate (); 1660 base_target.to_mourn_inferior (); 1661} 1662 1663/* Return whether thread PID is still valid. */ 1664 1665static int 1666aix_thread_thread_alive (ptid_t ptid) 1667{ 1668 if (!PD_TID (ptid)) 1669 return base_target.to_thread_alive (ptid); 1670 1671 /* We update the thread list every time the child stops, so all 1672 valid threads should be in the thread list. */ 1673 return in_thread_list (ptid); 1674} 1675 1676/* Return a printable representation of composite PID for use in 1677 "info threads" output. */ 1678 1679static char * 1680aix_thread_pid_to_str (ptid_t ptid) 1681{ 1682 static char *ret = NULL; 1683 1684 if (!PD_TID (ptid)) 1685 return base_target.to_pid_to_str (ptid); 1686 1687 /* Free previous return value; a new one will be allocated by 1688 xstrprintf(). */ 1689 xfree (ret); 1690 1691 ret = xstrprintf (_("Thread %ld"), ptid_get_tid (ptid)); 1692 return ret; 1693} 1694 1695/* Return a printable representation of extra information about 1696 THREAD, for use in "info threads" output. */ 1697 1698static char * 1699aix_thread_extra_thread_info (struct thread_info *thread) 1700{ 1701 struct ui_file *buf; 1702 int status; 1703 pthdb_pthread_t pdtid; 1704 pthdb_tid_t tid; 1705 pthdb_state_t state; 1706 pthdb_suspendstate_t suspendstate; 1707 pthdb_detachstate_t detachstate; 1708 int cancelpend; 1709 long length; 1710 static char *ret = NULL; 1711 1712 if (!PD_TID (thread->ptid)) 1713 return NULL; 1714 1715 buf = mem_fileopen (); 1716 1717 pdtid = thread->private->pdtid; 1718 tid = thread->private->tid; 1719 1720 if (tid != PTHDB_INVALID_TID) 1721 /* i18n: Like "thread-identifier %d, [state] running, suspended" */ 1722 fprintf_unfiltered (buf, _("tid %d"), (int)tid); 1723 1724 status = pthdb_pthread_state (pd_session, pdtid, &state); 1725 if (status != PTHDB_SUCCESS) 1726 state = PST_NOTSUP; 1727 fprintf_unfiltered (buf, ", %s", state2str (state)); 1728 1729 status = pthdb_pthread_suspendstate (pd_session, pdtid, 1730 &suspendstate); 1731 if (status == PTHDB_SUCCESS && suspendstate == PSS_SUSPENDED) 1732 /* i18n: Like "Thread-Id %d, [state] running, suspended" */ 1733 fprintf_unfiltered (buf, _(", suspended")); 1734 1735 status = pthdb_pthread_detachstate (pd_session, pdtid, 1736 &detachstate); 1737 if (status == PTHDB_SUCCESS && detachstate == PDS_DETACHED) 1738 /* i18n: Like "Thread-Id %d, [state] running, detached" */ 1739 fprintf_unfiltered (buf, _(", detached")); 1740 1741 pthdb_pthread_cancelpend (pd_session, pdtid, &cancelpend); 1742 if (status == PTHDB_SUCCESS && cancelpend) 1743 /* i18n: Like "Thread-Id %d, [state] running, cancel pending" */ 1744 fprintf_unfiltered (buf, _(", cancel pending")); 1745 1746 ui_file_write (buf, "", 1); 1747 1748 xfree (ret); /* Free old buffer. */ 1749 1750 ret = ui_file_xstrdup (buf, &length); 1751 ui_file_delete (buf); 1752 1753 return ret; 1754} 1755 1756/* Initialize target aix_thread_ops. */ 1757 1758static void 1759init_aix_thread_ops (void) 1760{ 1761 aix_thread_ops.to_shortname = "aix-threads"; 1762 aix_thread_ops.to_longname = _("AIX pthread support"); 1763 aix_thread_ops.to_doc = _("AIX pthread support"); 1764 1765 aix_thread_ops.to_attach = aix_thread_attach; 1766 aix_thread_ops.to_detach = aix_thread_detach; 1767 aix_thread_ops.to_resume = aix_thread_resume; 1768 aix_thread_ops.to_wait = aix_thread_wait; 1769 aix_thread_ops.to_fetch_registers = aix_thread_fetch_registers; 1770 aix_thread_ops.to_store_registers = aix_thread_store_registers; 1771 aix_thread_ops.to_xfer_partial = aix_thread_xfer_partial; 1772 /* No need for aix_thread_ops.to_create_inferior, because we activate thread 1773 debugging when the inferior reaches pd_brk_addr. */ 1774 aix_thread_ops.to_kill = aix_thread_kill; 1775 aix_thread_ops.to_mourn_inferior = aix_thread_mourn_inferior; 1776 aix_thread_ops.to_thread_alive = aix_thread_thread_alive; 1777 aix_thread_ops.to_pid_to_str = aix_thread_pid_to_str; 1778 aix_thread_ops.to_extra_thread_info = aix_thread_extra_thread_info; 1779 aix_thread_ops.to_stratum = thread_stratum; 1780 aix_thread_ops.to_magic = OPS_MAGIC; 1781} 1782 1783/* Module startup initialization function, automagically called by 1784 init.c. */ 1785 1786void 1787_initialize_aix_thread (void) 1788{ 1789 init_aix_thread_ops (); 1790 add_target (&aix_thread_ops); 1791 1792 /* Notice when object files get loaded and unloaded. */ 1793 observer_attach_new_objfile (new_objfile); 1794 1795 add_setshow_boolean_cmd ("aix-thread", class_maintenance, &debug_aix_thread, 1796 _("Set debugging of AIX thread module."), 1797 _("Show debugging of AIX thread module."), 1798 _("Enables debugging output (used to debug GDB)."), 1799 NULL, NULL, /* FIXME: i18n: Debugging of AIX thread module is \"%d\". */ 1800 &setdebuglist, &showdebuglist); 1801} 1802