| 1 | /* Native support code for HPUX PA-RISC. |
| 2 | Copyright 1986, 1987, 1989, 1990, 1991, 1992, 1993, 1998 |
| 3 | Free Software Foundation, Inc. |
| 4 | |
| 5 | Contributed by the Center for Software Science at the |
| 6 | University of Utah (pa-gdb-bugs@cs.utah.edu). |
| 7 | |
| 8 | This file is part of GDB. |
| 9 | |
| 10 | This program is free software; you can redistribute it and/or modify |
| 11 | it under the terms of the GNU General Public License as published by |
| 12 | the Free Software Foundation; either version 2 of the License, or |
| 13 | (at your option) any later version. |
| 14 | |
| 15 | This program is distributed in the hope that it will be useful, |
| 16 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 17 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 18 | GNU General Public License for more details. |
| 19 | |
| 20 | You should have received a copy of the GNU General Public License |
| 21 | along with this program; if not, write to the Free Software |
| 22 | Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ |
| 23 | |
| 24 | |
| 25 | #include "defs.h" |
| 26 | #include "inferior.h" |
| 27 | #include "target.h" |
| 28 | #include <sys/ptrace.h> |
| 29 | #include "gdbcore.h" |
| 30 | #include <wait.h> |
| 31 | #include <signal.h> |
| 32 | |
| 33 | extern CORE_ADDR text_end; |
| 34 | |
| 35 | static void fetch_register PARAMS ((int)); |
| 36 | |
| 37 | void |
| 38 | fetch_inferior_registers (regno) |
| 39 | int regno; |
| 40 | { |
| 41 | if (regno == -1) |
| 42 | for (regno = 0; regno < NUM_REGS; regno++) |
| 43 | fetch_register (regno); |
| 44 | else |
| 45 | fetch_register (regno); |
| 46 | } |
| 47 | |
| 48 | /* Store our register values back into the inferior. |
| 49 | If REGNO is -1, do this for all registers. |
| 50 | Otherwise, REGNO specifies which register (so we can save time). */ |
| 51 | |
| 52 | void |
| 53 | store_inferior_registers (regno) |
| 54 | int regno; |
| 55 | { |
| 56 | register unsigned int regaddr; |
| 57 | char buf[80]; |
| 58 | extern char registers[]; |
| 59 | register int i; |
| 60 | unsigned int offset = U_REGS_OFFSET; |
| 61 | int scratch; |
| 62 | |
| 63 | if (regno >= 0) |
| 64 | { |
| 65 | if (CANNOT_STORE_REGISTER (regno)) |
| 66 | return; |
| 67 | regaddr = register_addr (regno, offset); |
| 68 | errno = 0; |
| 69 | if (regno == PCOQ_HEAD_REGNUM || regno == PCOQ_TAIL_REGNUM) |
| 70 | { |
| 71 | scratch = *(int *) ®isters[REGISTER_BYTE (regno)] | 0x3; |
| 72 | call_ptrace (PT_WUREGS, inferior_pid, (PTRACE_ARG3_TYPE) regaddr, |
| 73 | scratch); |
| 74 | if (errno != 0) |
| 75 | { |
| 76 | /* Error, even if attached. Failing to write these two |
| 77 | registers is pretty serious. */ |
| 78 | sprintf (buf, "writing register number %d", regno); |
| 79 | perror_with_name (buf); |
| 80 | } |
| 81 | } |
| 82 | else |
| 83 | for (i = 0; i < REGISTER_RAW_SIZE (regno); i += sizeof(int)) |
| 84 | { |
| 85 | errno = 0; |
| 86 | call_ptrace (PT_WUREGS, inferior_pid, (PTRACE_ARG3_TYPE) regaddr, |
| 87 | *(int *) ®isters[REGISTER_BYTE (regno) + i]); |
| 88 | if (errno != 0) |
| 89 | { |
| 90 | /* Warning, not error, in case we are attached; sometimes the |
| 91 | kernel doesn't let us at the registers. */ |
| 92 | char *err = safe_strerror (errno); |
| 93 | char *msg = alloca (strlen (err) + 128); |
| 94 | sprintf (msg, "writing register %s: %s", |
| 95 | REGISTER_NAME (regno), err); |
| 96 | warning (msg); |
| 97 | return; |
| 98 | } |
| 99 | regaddr += sizeof(int); |
| 100 | } |
| 101 | } |
| 102 | else |
| 103 | for (regno = 0; regno < NUM_REGS; regno++) |
| 104 | store_inferior_registers (regno); |
| 105 | } |
| 106 | |
| 107 | /* Fetch one register. */ |
| 108 | |
| 109 | static void |
| 110 | fetch_register (regno) |
| 111 | int regno; |
| 112 | { |
| 113 | register unsigned int regaddr; |
| 114 | char buf[MAX_REGISTER_RAW_SIZE]; |
| 115 | register int i; |
| 116 | |
| 117 | /* Offset of registers within the u area. */ |
| 118 | unsigned int offset; |
| 119 | |
| 120 | offset = U_REGS_OFFSET; |
| 121 | |
| 122 | regaddr = register_addr (regno, offset); |
| 123 | for (i = 0; i < REGISTER_RAW_SIZE (regno); i += sizeof (int)) |
| 124 | { |
| 125 | errno = 0; |
| 126 | *(int *) &buf[i] = call_ptrace (PT_RUREGS, inferior_pid, |
| 127 | (PTRACE_ARG3_TYPE) regaddr, 0); |
| 128 | regaddr += sizeof (int); |
| 129 | if (errno != 0) |
| 130 | { |
| 131 | /* Warning, not error, in case we are attached; sometimes the |
| 132 | * kernel doesn't let us at the registers. |
| 133 | */ |
| 134 | char *err = safe_strerror (errno); |
| 135 | char *msg = alloca (strlen (err) + 128); |
| 136 | sprintf (msg, "reading register %s: %s", REGISTER_NAME (regno), err); |
| 137 | warning (msg); |
| 138 | goto error_exit; |
| 139 | } |
| 140 | } |
| 141 | if (regno == PCOQ_HEAD_REGNUM || regno == PCOQ_TAIL_REGNUM) |
| 142 | buf[3] &= ~0x3; |
| 143 | supply_register (regno, buf); |
| 144 | error_exit:; |
| 145 | } |
| 146 | |
| 147 | /* Copy LEN bytes to or from inferior's memory starting at MEMADDR |
| 148 | to debugger memory starting at MYADDR. Copy to inferior if |
| 149 | WRITE is nonzero. |
| 150 | |
| 151 | Returns the length copied, which is either the LEN argument or zero. |
| 152 | This xfer function does not do partial moves, since child_ops |
| 153 | doesn't allow memory operations to cross below us in the target stack |
| 154 | anyway. */ |
| 155 | |
| 156 | int |
| 157 | child_xfer_memory (memaddr, myaddr, len, write, target) |
| 158 | CORE_ADDR memaddr; |
| 159 | char *myaddr; |
| 160 | int len; |
| 161 | int write; |
| 162 | struct target_ops *target; /* ignored */ |
| 163 | { |
| 164 | register int i; |
| 165 | /* Round starting address down to longword boundary. */ |
| 166 | register CORE_ADDR addr = memaddr & - sizeof (int); |
| 167 | /* Round ending address up; get number of longwords that makes. */ |
| 168 | register int count |
| 169 | = (((memaddr + len) - addr) + sizeof (int) - 1) / sizeof (int); |
| 170 | |
| 171 | /* Allocate buffer of that many longwords. */ |
| 172 | /* Note (RT) - This code formerly used alloca, which I have |
| 173 | * replaced with xmalloc and a matching free() at the end. |
| 174 | * The problem with alloca() is that there is no guarantee of |
| 175 | * when it'll be freed, and we were seeing cases of memory |
| 176 | * leaks on: |
| 177 | * (gdb) watch x |
| 178 | * (gdb) cont |
| 179 | * where the piled-up alloca's for the child_xfer_memory buffers |
| 180 | * were not getting freed. |
| 181 | */ |
| 182 | register int *buffer = (int *) xmalloc (count * sizeof (int)); |
| 183 | |
| 184 | if (write) |
| 185 | { |
| 186 | /* Fill start and end extra bytes of buffer with existing memory data. */ |
| 187 | |
| 188 | if (addr != memaddr || len < (int)sizeof (int)) { |
| 189 | /* Need part of initial word -- fetch it. */ |
| 190 | buffer[0] = call_ptrace (addr < text_end ? PT_RIUSER : PT_RDUSER, |
| 191 | inferior_pid, (PTRACE_ARG3_TYPE) addr, 0); |
| 192 | } |
| 193 | |
| 194 | if (count > 1) /* FIXME, avoid if even boundary */ |
| 195 | { |
| 196 | buffer[count - 1] |
| 197 | = call_ptrace (addr < text_end ? PT_RIUSER : PT_RDUSER, inferior_pid, |
| 198 | (PTRACE_ARG3_TYPE) (addr + (count - 1) * sizeof (int)), |
| 199 | 0); |
| 200 | } |
| 201 | |
| 202 | /* Copy data to be written over corresponding part of buffer */ |
| 203 | |
| 204 | memcpy ((char *) buffer + (memaddr & (sizeof (int) - 1)), myaddr, len); |
| 205 | |
| 206 | /* Write the entire buffer. */ |
| 207 | |
| 208 | for (i = 0; i < count; i++, addr += sizeof (int)) |
| 209 | { |
| 210 | int pt_status; |
| 211 | int pt_request; |
| 212 | /* The HP-UX kernel crashes if you use PT_WDUSER to write into the text |
| 213 | segment. FIXME -- does it work to write into the data segment using |
| 214 | WIUSER, or do these idiots really expect us to figure out which segment |
| 215 | the address is in, so we can use a separate system call for it??! */ |
| 216 | errno = 0; |
| 217 | pt_request = (addr < text_end) ? PT_WIUSER : PT_WDUSER; |
| 218 | pt_status = call_ptrace (pt_request, |
| 219 | inferior_pid, |
| 220 | (PTRACE_ARG3_TYPE) addr, |
| 221 | buffer[i]); |
| 222 | |
| 223 | /* Did we fail? Might we've guessed wrong about which |
| 224 | segment this address resides in? Try the other request, |
| 225 | and see if that works... |
| 226 | */ |
| 227 | if ((pt_status == -1) && errno) { |
| 228 | errno = 0; |
| 229 | pt_request = (pt_request == PT_WIUSER) ? PT_WDUSER : PT_WIUSER; |
| 230 | pt_status = call_ptrace (pt_request, |
| 231 | inferior_pid, |
| 232 | (PTRACE_ARG3_TYPE) addr, |
| 233 | buffer[i]); |
| 234 | |
| 235 | /* No, we still fail. Okay, time to punt. */ |
| 236 | if ((pt_status == -1) && errno) |
| 237 | { |
| 238 | free(buffer); |
| 239 | return 0; |
| 240 | } |
| 241 | } |
| 242 | } |
| 243 | } |
| 244 | else |
| 245 | { |
| 246 | /* Read all the longwords */ |
| 247 | for (i = 0; i < count; i++, addr += sizeof (int)) |
| 248 | { |
| 249 | errno = 0; |
| 250 | buffer[i] = call_ptrace (addr < text_end ? PT_RIUSER : PT_RDUSER, |
| 251 | inferior_pid, (PTRACE_ARG3_TYPE) addr, 0); |
| 252 | if (errno) { |
| 253 | free(buffer); |
| 254 | return 0; |
| 255 | } |
| 256 | QUIT; |
| 257 | } |
| 258 | |
| 259 | /* Copy appropriate bytes out of the buffer. */ |
| 260 | memcpy (myaddr, (char *) buffer + (memaddr & (sizeof (int) - 1)), len); |
| 261 | } |
| 262 | free(buffer); |
| 263 | return len; |
| 264 | } |
| 265 | |
| 266 | |
| 267 | void |
| 268 | child_post_follow_inferior_by_clone () |
| 269 | { |
| 270 | int status; |
| 271 | |
| 272 | /* This function is used when following both the parent and child |
| 273 | of a fork. In this case, the debugger clones itself. The original |
| 274 | debugger follows the parent, the clone follows the child. The |
| 275 | original detaches from the child, delivering a SIGSTOP to it to |
| 276 | keep it from running away until the clone can attach itself. |
| 277 | |
| 278 | At this point, the clone has attached to the child. Because of |
| 279 | the SIGSTOP, we must now deliver a SIGCONT to the child, or it |
| 280 | won't behave properly. */ |
| 281 | status = kill (inferior_pid, SIGCONT); |
| 282 | } |
| 283 | |
| 284 | |
| 285 | void |
| 286 | child_post_follow_vfork (parent_pid, followed_parent, child_pid, followed_child) |
| 287 | int parent_pid; |
| 288 | int followed_parent; |
| 289 | int child_pid; |
| 290 | int followed_child; |
| 291 | { |
| 292 | |
| 293 | /* Are we a debugger that followed the parent of a vfork? If so, |
| 294 | then recall that the child's vfork event was delivered to us |
| 295 | first. And, that the parent was suspended by the OS until the |
| 296 | child's exec or exit events were received. |
| 297 | |
| 298 | Upon receiving that child vfork, then, we were forced to remove |
| 299 | all breakpoints in the child and continue it so that it could |
| 300 | reach the exec or exit point. |
| 301 | |
| 302 | But also recall that the parent and child of a vfork share the |
| 303 | same address space. Thus, removing bp's in the child also |
| 304 | removed them from the parent. |
| 305 | |
| 306 | Now that the child has safely exec'd or exited, we must restore |
| 307 | the parent's breakpoints before we continue it. Else, we may |
| 308 | cause it run past expected stopping points. */ |
| 309 | if (followed_parent) |
| 310 | { |
| 311 | reattach_breakpoints (parent_pid); |
| 312 | } |
| 313 | |
| 314 | /* Are we a debugger that followed the child of a vfork? If so, |
| 315 | then recall that we don't actually acquire control of the child |
| 316 | until after it has exec'd or exited. |
| 317 | */ |
| 318 | if (followed_child) |
| 319 | { |
| 320 | /* If the child has exited, then there's nothing for us to do. |
| 321 | In the case of an exec event, we'll let that be handled by |
| 322 | the normal mechanism that notices and handles exec events, in |
| 323 | resume(). */ |
| 324 | |
| 325 | } |
| 326 | } |
| 327 | |
| 328 | /* Format a process id, given a pid. Be sure to terminate |
| 329 | * this with a null--it's going to be printed via a "%s". |
| 330 | */ |
| 331 | char * |
| 332 | hppa_pid_to_str( pid ) |
| 333 | pid_t pid; |
| 334 | { |
| 335 | static char buf[30]; /* Static because address returned */ |
| 336 | |
| 337 | sprintf( buf, "process %d\0\0\0\0", pid ); |
| 338 | /* Extra NULLs for paranoia's sake */ |
| 339 | |
| 340 | return buf; |
| 341 | } |
| 342 | |
| 343 | /* Format a thread id, given a tid. Be sure to terminate |
| 344 | * this with a null--it's going to be printed via a "%s". |
| 345 | * |
| 346 | * Note: This is a core-gdb tid, not the actual system tid. |
| 347 | * See infttrace.c for details. |
| 348 | */ |
| 349 | char * |
| 350 | hppa_tid_to_str( tid ) |
| 351 | pid_t tid; |
| 352 | { |
| 353 | static char buf[30]; /* Static because address returned */ |
| 354 | |
| 355 | sprintf( buf, "system thread %d\0\0\0\0", tid ); |
| 356 | /* Extra NULLs for paranoia's sake */ |
| 357 | |
| 358 | return buf; |
| 359 | } |
| 360 | |
| 361 | #if !defined (GDB_NATIVE_HPUX_11) |
| 362 | |
| 363 | /* The following code is a substitute for the infttrace.c versions used |
| 364 | with ttrace() in HPUX 11. */ |
| 365 | |
| 366 | /* This value is an arbitrary integer. */ |
| 367 | #define PT_VERSION 123456 |
| 368 | |
| 369 | /* This semaphore is used to coordinate the child and parent processes |
| 370 | after a fork(), and before an exec() by the child. See |
| 371 | parent_attach_all for details. */ |
| 372 | |
| 373 | typedef struct { |
| 374 | int parent_channel[2]; /* Parent "talks" to [1], child "listens" to [0] */ |
| 375 | int child_channel[2]; /* Child "talks" to [1], parent "listens" to [0] */ |
| 376 | } startup_semaphore_t; |
| 377 | |
| 378 | #define SEM_TALK (1) |
| 379 | #define SEM_LISTEN (0) |
| 380 | |
| 381 | static startup_semaphore_t startup_semaphore; |
| 382 | |
| 383 | extern int parent_attach_all PARAMS ((int, PTRACE_ARG3_TYPE, int)); |
| 384 | |
| 385 | #ifdef PT_SETTRC |
| 386 | /* This function causes the caller's process to be traced by its |
| 387 | parent. This is intended to be called after GDB forks itself, |
| 388 | and before the child execs the target. |
| 389 | |
| 390 | Note that HP-UX ptrace is rather funky in how this is done. |
| 391 | If the parent wants to get the initial exec event of a child, |
| 392 | it must set the ptrace event mask of the child to include execs. |
| 393 | (The child cannot do this itself.) This must be done after the |
| 394 | child is forked, but before it execs. |
| 395 | |
| 396 | To coordinate the parent and child, we implement a semaphore using |
| 397 | pipes. After SETTRC'ing itself, the child tells the parent that |
| 398 | it is now traceable by the parent, and waits for the parent's |
| 399 | acknowledgement. The parent can then set the child's event mask, |
| 400 | and notify the child that it can now exec. |
| 401 | |
| 402 | (The acknowledgement by parent happens as a result of a call to |
| 403 | child_acknowledge_created_inferior.) */ |
| 404 | |
| 405 | int |
| 406 | parent_attach_all (pid, addr, data) |
| 407 | int pid; |
| 408 | PTRACE_ARG3_TYPE addr; |
| 409 | int data; |
| 410 | { |
| 411 | int pt_status = 0; |
| 412 | |
| 413 | /* We need a memory home for a constant. */ |
| 414 | int tc_magic_child = PT_VERSION; |
| 415 | int tc_magic_parent = 0; |
| 416 | |
| 417 | /* The remainder of this function is only useful for HPUX 10.0 and |
| 418 | later, as it depends upon the ability to request notification |
| 419 | of specific kinds of events by the kernel. */ |
| 420 | #if defined(PT_SET_EVENT_MASK) |
| 421 | |
| 422 | /* Notify the parent that we're potentially ready to exec(). */ |
| 423 | write (startup_semaphore.child_channel[SEM_TALK], |
| 424 | &tc_magic_child, |
| 425 | sizeof (tc_magic_child)); |
| 426 | |
| 427 | /* Wait for acknowledgement from the parent. */ |
| 428 | read (startup_semaphore.parent_channel[SEM_LISTEN], |
| 429 | &tc_magic_parent, |
| 430 | sizeof (tc_magic_parent)); |
| 431 | if (tc_magic_child != tc_magic_parent) |
| 432 | warning ("mismatched semaphore magic"); |
| 433 | |
| 434 | /* Discard our copy of the semaphore. */ |
| 435 | (void) close (startup_semaphore.parent_channel[SEM_LISTEN]); |
| 436 | (void) close (startup_semaphore.parent_channel[SEM_TALK]); |
| 437 | (void) close (startup_semaphore.child_channel[SEM_LISTEN]); |
| 438 | (void) close (startup_semaphore.child_channel[SEM_TALK]); |
| 439 | #endif |
| 440 | |
| 441 | return 0; |
| 442 | } |
| 443 | #endif |
| 444 | |
| 445 | int |
| 446 | hppa_require_attach (pid) |
| 447 | int pid; |
| 448 | { |
| 449 | int pt_status; |
| 450 | CORE_ADDR pc; |
| 451 | CORE_ADDR pc_addr; |
| 452 | unsigned int regs_offset; |
| 453 | |
| 454 | /* Are we already attached? There appears to be no explicit way to |
| 455 | answer this via ptrace, so we try something which should be |
| 456 | innocuous if we are attached. If that fails, then we assume |
| 457 | we're not attached, and so attempt to make it so. */ |
| 458 | |
| 459 | errno = 0; |
| 460 | regs_offset = U_REGS_OFFSET; |
| 461 | pc_addr = register_addr (PC_REGNUM, regs_offset); |
| 462 | pc = call_ptrace (PT_READ_U, pid, (PTRACE_ARG3_TYPE) pc_addr, 0); |
| 463 | |
| 464 | if (errno) |
| 465 | { |
| 466 | errno = 0; |
| 467 | pt_status = call_ptrace (PT_ATTACH, pid, (PTRACE_ARG3_TYPE) 0, 0); |
| 468 | |
| 469 | if (errno) |
| 470 | return -1; |
| 471 | |
| 472 | /* Now we really are attached. */ |
| 473 | errno = 0; |
| 474 | } |
| 475 | attach_flag = 1; |
| 476 | return pid; |
| 477 | } |
| 478 | |
| 479 | int |
| 480 | hppa_require_detach (pid, signal) |
| 481 | int pid; |
| 482 | int signal; |
| 483 | { |
| 484 | errno = 0; |
| 485 | call_ptrace (PT_DETACH, pid, (PTRACE_ARG3_TYPE) 1, signal); |
| 486 | errno = 0; /* Ignore any errors. */ |
| 487 | return pid; |
| 488 | } |
| 489 | |
| 490 | /* Since ptrace doesn't support memory page-protection events, which |
| 491 | are used to implement "hardware" watchpoints on HP-UX, these are |
| 492 | dummy versions, which perform no useful work. */ |
| 493 | |
| 494 | void |
| 495 | hppa_enable_page_protection_events (pid) |
| 496 | int pid; |
| 497 | { |
| 498 | } |
| 499 | |
| 500 | void |
| 501 | hppa_disable_page_protection_events (pid) |
| 502 | int pid; |
| 503 | { |
| 504 | } |
| 505 | |
| 506 | int |
| 507 | hppa_insert_hw_watchpoint (pid, start, len, type) |
| 508 | int pid; |
| 509 | CORE_ADDR start; |
| 510 | LONGEST len; |
| 511 | int type; |
| 512 | { |
| 513 | error ("Hardware watchpoints not implemented on this platform."); |
| 514 | } |
| 515 | |
| 516 | int |
| 517 | hppa_remove_hw_watchpoint (pid, start, len, type) |
| 518 | int pid; |
| 519 | CORE_ADDR start; |
| 520 | LONGEST len; |
| 521 | enum bptype type; |
| 522 | { |
| 523 | error ("Hardware watchpoints not implemented on this platform."); |
| 524 | } |
| 525 | |
| 526 | int |
| 527 | hppa_can_use_hw_watchpoint (type, cnt, ot) |
| 528 | enum bptype type; |
| 529 | int cnt; |
| 530 | enum bptype ot; |
| 531 | { |
| 532 | return 0; |
| 533 | } |
| 534 | |
| 535 | int |
| 536 | hppa_range_profitable_for_hw_watchpoint (pid, start, len) |
| 537 | int pid; |
| 538 | CORE_ADDR start; |
| 539 | LONGEST len; |
| 540 | { |
| 541 | error ("Hardware watchpoints not implemented on this platform."); |
| 542 | } |
| 543 | |
| 544 | char * |
| 545 | hppa_pid_or_tid_to_str (id) |
| 546 | pid_t id; |
| 547 | { |
| 548 | /* In the ptrace world, there are only processes. */ |
| 549 | return hppa_pid_to_str (id); |
| 550 | } |
| 551 | |
| 552 | /* This function has no meaning in a non-threaded world. Thus, we |
| 553 | return 0 (FALSE). See the use of "hppa_prepare_to_proceed" in |
| 554 | hppa-tdep.c. */ |
| 555 | |
| 556 | pid_t |
| 557 | hppa_switched_threads (pid) |
| 558 | pid_t pid; |
| 559 | { |
| 560 | return (pid_t) 0; |
| 561 | } |
| 562 | |
| 563 | void |
| 564 | hppa_ensure_vforking_parent_remains_stopped (pid) |
| 565 | int pid; |
| 566 | { |
| 567 | /* This assumes that the vforked parent is presently stopped, and |
| 568 | that the vforked child has just delivered its first exec event. |
| 569 | Calling kill() this way will cause the SIGTRAP to be delivered as |
| 570 | soon as the parent is resumed, which happens as soon as the |
| 571 | vforked child is resumed. See wait_for_inferior for the use of |
| 572 | this function. */ |
| 573 | kill (pid, SIGTRAP); |
| 574 | } |
| 575 | |
| 576 | int |
| 577 | hppa_resume_execd_vforking_child_to_get_parent_vfork () |
| 578 | { |
| 579 | return 1; /* Yes, the child must be resumed. */ |
| 580 | } |
| 581 | |
| 582 | void |
| 583 | require_notification_of_events (pid) |
| 584 | int pid; |
| 585 | { |
| 586 | #if defined(PT_SET_EVENT_MASK) |
| 587 | int pt_status; |
| 588 | ptrace_event_t ptrace_events; |
| 589 | |
| 590 | /* Instruct the kernel as to the set of events we wish to be |
| 591 | informed of. (This support does not exist before HPUX 10.0. |
| 592 | We'll assume if PT_SET_EVENT_MASK has not been defined by |
| 593 | <sys/ptrace.h>, then we're being built on pre-10.0.) |
| 594 | */ |
| 595 | memset (&ptrace_events, 0, sizeof (ptrace_events)); |
| 596 | |
| 597 | /* Note: By default, all signals are visible to us. If we wish |
| 598 | the kernel to keep certain signals hidden from us, we do it |
| 599 | by calling sigdelset (ptrace_events.pe_signals, signal) for |
| 600 | each such signal here, before doing PT_SET_EVENT_MASK. |
| 601 | */ |
| 602 | sigemptyset (&ptrace_events.pe_signals); |
| 603 | |
| 604 | ptrace_events.pe_set_event = 0; |
| 605 | |
| 606 | ptrace_events.pe_set_event |= PTRACE_SIGNAL; |
| 607 | ptrace_events.pe_set_event |= PTRACE_EXEC; |
| 608 | ptrace_events.pe_set_event |= PTRACE_FORK; |
| 609 | ptrace_events.pe_set_event |= PTRACE_VFORK; |
| 610 | /* ??rehrauer: Add this one when we're prepared to catch it... |
| 611 | ptrace_events.pe_set_event |= PTRACE_EXIT; |
| 612 | */ |
| 613 | |
| 614 | errno = 0; |
| 615 | pt_status = call_ptrace (PT_SET_EVENT_MASK, |
| 616 | pid, |
| 617 | (PTRACE_ARG3_TYPE) &ptrace_events, |
| 618 | sizeof (ptrace_events)); |
| 619 | if (errno) |
| 620 | perror_with_name ("ptrace"); |
| 621 | if (pt_status < 0) |
| 622 | return; |
| 623 | #endif |
| 624 | } |
| 625 | |
| 626 | void |
| 627 | require_notification_of_exec_events (pid) |
| 628 | int pid; |
| 629 | { |
| 630 | #if defined(PT_SET_EVENT_MASK) |
| 631 | int pt_status; |
| 632 | ptrace_event_t ptrace_events; |
| 633 | |
| 634 | /* Instruct the kernel as to the set of events we wish to be |
| 635 | informed of. (This support does not exist before HPUX 10.0. |
| 636 | We'll assume if PT_SET_EVENT_MASK has not been defined by |
| 637 | <sys/ptrace.h>, then we're being built on pre-10.0.) |
| 638 | */ |
| 639 | memset (&ptrace_events, 0, sizeof (ptrace_events)); |
| 640 | |
| 641 | /* Note: By default, all signals are visible to us. If we wish |
| 642 | the kernel to keep certain signals hidden from us, we do it |
| 643 | by calling sigdelset (ptrace_events.pe_signals, signal) for |
| 644 | each such signal here, before doing PT_SET_EVENT_MASK. |
| 645 | */ |
| 646 | sigemptyset (&ptrace_events.pe_signals); |
| 647 | |
| 648 | ptrace_events.pe_set_event = 0; |
| 649 | |
| 650 | ptrace_events.pe_set_event |= PTRACE_EXEC; |
| 651 | /* ??rehrauer: Add this one when we're prepared to catch it... |
| 652 | ptrace_events.pe_set_event |= PTRACE_EXIT; |
| 653 | */ |
| 654 | |
| 655 | errno = 0; |
| 656 | pt_status = call_ptrace (PT_SET_EVENT_MASK, |
| 657 | pid, |
| 658 | (PTRACE_ARG3_TYPE) &ptrace_events, |
| 659 | sizeof (ptrace_events)); |
| 660 | if (errno) |
| 661 | perror_with_name ("ptrace"); |
| 662 | if (pt_status < 0) |
| 663 | return; |
| 664 | #endif |
| 665 | } |
| 666 | |
| 667 | /* This function is called by the parent process, with pid being the |
| 668 | ID of the child process, after the debugger has forked. */ |
| 669 | |
| 670 | void |
| 671 | child_acknowledge_created_inferior (pid) |
| 672 | int pid; |
| 673 | { |
| 674 | /* We need a memory home for a constant. */ |
| 675 | int tc_magic_parent = PT_VERSION; |
| 676 | int tc_magic_child = 0; |
| 677 | |
| 678 | /* Wait for the child to tell us that it has forked. */ |
| 679 | read (startup_semaphore.child_channel[SEM_LISTEN], |
| 680 | &tc_magic_child, |
| 681 | sizeof(tc_magic_child)); |
| 682 | |
| 683 | /* Notify the child that it can exec. |
| 684 | |
| 685 | In the infttrace.c variant of this function, we set the child's |
| 686 | event mask after the fork but before the exec. In the ptrace |
| 687 | world, it seems we can't set the event mask until after the exec. */ |
| 688 | |
| 689 | write (startup_semaphore.parent_channel[SEM_TALK], |
| 690 | &tc_magic_parent, |
| 691 | sizeof (tc_magic_parent)); |
| 692 | |
| 693 | /* We'd better pause a bit before trying to set the event mask, |
| 694 | though, to ensure that the exec has happened. We don't want to |
| 695 | wait() on the child, because that'll screw up the upper layers |
| 696 | of gdb's execution control that expect to see the exec event. |
| 697 | |
| 698 | After an exec, the child is no longer executing gdb code. Hence, |
| 699 | we can't have yet another synchronization via the pipes. We'll |
| 700 | just sleep for a second, and hope that's enough delay... */ |
| 701 | |
| 702 | sleep (1); |
| 703 | |
| 704 | /* Instruct the kernel as to the set of events we wish to be |
| 705 | informed of. */ |
| 706 | |
| 707 | require_notification_of_exec_events (pid); |
| 708 | |
| 709 | /* Discard our copy of the semaphore. */ |
| 710 | (void) close (startup_semaphore.parent_channel[SEM_LISTEN]); |
| 711 | (void) close (startup_semaphore.parent_channel[SEM_TALK]); |
| 712 | (void) close (startup_semaphore.child_channel[SEM_LISTEN]); |
| 713 | (void) close (startup_semaphore.child_channel[SEM_TALK]); |
| 714 | } |
| 715 | |
| 716 | void |
| 717 | child_post_startup_inferior (pid) |
| 718 | int pid; |
| 719 | |
| 720 | { |
| 721 | require_notification_of_events (pid); |
| 722 | } |
| 723 | |
| 724 | void |
| 725 | child_post_attach (pid) |
| 726 | int pid; |
| 727 | { |
| 728 | require_notification_of_events (pid); |
| 729 | } |
| 730 | |
| 731 | int |
| 732 | child_insert_fork_catchpoint (pid) |
| 733 | int pid; |
| 734 | { |
| 735 | /* This request is only available on HPUX 10.0 and later. */ |
| 736 | #if !defined(PT_SET_EVENT_MASK) |
| 737 | error ("Unable to catch forks prior to HPUX 10.0"); |
| 738 | #else |
| 739 | /* Enable reporting of fork events from the kernel. */ |
| 740 | /* ??rehrauer: For the moment, we're always enabling these events, |
| 741 | and just ignoring them if there's no catchpoint to catch them. |
| 742 | */ |
| 743 | return 0; |
| 744 | #endif |
| 745 | } |
| 746 | |
| 747 | int |
| 748 | child_remove_fork_catchpoint (pid) |
| 749 | int pid; |
| 750 | { |
| 751 | /* This request is only available on HPUX 10.0 and later. */ |
| 752 | #if !defined(PT_SET_EVENT_MASK) |
| 753 | error ("Unable to catch forks prior to HPUX 10.0"); |
| 754 | #else |
| 755 | /* Disable reporting of fork events from the kernel. */ |
| 756 | /* ??rehrauer: For the moment, we're always enabling these events, |
| 757 | and just ignoring them if there's no catchpoint to catch them. */ |
| 758 | return 0; |
| 759 | #endif |
| 760 | } |
| 761 | |
| 762 | int |
| 763 | child_insert_vfork_catchpoint (pid) |
| 764 | int pid; |
| 765 | { |
| 766 | /* This request is only available on HPUX 10.0 and later. */ |
| 767 | #if !defined(PT_SET_EVENT_MASK) |
| 768 | error ("Unable to catch vforks prior to HPUX 10.0"); |
| 769 | #else |
| 770 | /* Enable reporting of vfork events from the kernel. */ |
| 771 | /* ??rehrauer: For the moment, we're always enabling these events, |
| 772 | and just ignoring them if there's no catchpoint to catch them. */ |
| 773 | return 0; |
| 774 | #endif |
| 775 | } |
| 776 | |
| 777 | int |
| 778 | child_remove_vfork_catchpoint (pid) |
| 779 | int pid; |
| 780 | { |
| 781 | /* This request is only available on HPUX 10.0 and later. */ |
| 782 | #if !defined(PT_SET_EVENT_MASK) |
| 783 | error ("Unable to catch vforks prior to HPUX 10.0"); |
| 784 | #else |
| 785 | /* Disable reporting of vfork events from the kernel. */ |
| 786 | /* ??rehrauer: For the moment, we're always enabling these events, |
| 787 | and just ignoring them if there's no catchpoint to catch them. */ |
| 788 | return 0; |
| 789 | #endif |
| 790 | } |
| 791 | |
| 792 | int |
| 793 | child_has_forked (pid, childpid) |
| 794 | int pid; |
| 795 | int * childpid; |
| 796 | { |
| 797 | /* This request is only available on HPUX 10.0 and later. */ |
| 798 | #if !defined(PT_GET_PROCESS_STATE) |
| 799 | *childpid = 0; |
| 800 | return 0; |
| 801 | #else |
| 802 | int pt_status; |
| 803 | ptrace_state_t ptrace_state; |
| 804 | |
| 805 | errno = 0; |
| 806 | pt_status = call_ptrace (PT_GET_PROCESS_STATE, |
| 807 | pid, |
| 808 | (PTRACE_ARG3_TYPE) &ptrace_state, |
| 809 | sizeof (ptrace_state)); |
| 810 | if (errno) |
| 811 | perror_with_name ("ptrace"); |
| 812 | if (pt_status < 0) |
| 813 | return 0; |
| 814 | |
| 815 | if (ptrace_state.pe_report_event & PTRACE_FORK) |
| 816 | { |
| 817 | *childpid = ptrace_state.pe_other_pid; |
| 818 | return 1; |
| 819 | } |
| 820 | |
| 821 | return 0; |
| 822 | #endif |
| 823 | } |
| 824 | |
| 825 | int |
| 826 | child_has_vforked (pid, childpid) |
| 827 | int pid; |
| 828 | int * childpid; |
| 829 | { |
| 830 | /* This request is only available on HPUX 10.0 and later. */ |
| 831 | #if !defined(PT_GET_PROCESS_STATE) |
| 832 | *childpid = 0; |
| 833 | return 0; |
| 834 | |
| 835 | #else |
| 836 | int pt_status; |
| 837 | ptrace_state_t ptrace_state; |
| 838 | |
| 839 | errno = 0; |
| 840 | pt_status = call_ptrace (PT_GET_PROCESS_STATE, |
| 841 | pid, |
| 842 | (PTRACE_ARG3_TYPE) &ptrace_state, |
| 843 | sizeof (ptrace_state)); |
| 844 | if (errno) |
| 845 | perror_with_name ("ptrace"); |
| 846 | if (pt_status < 0) |
| 847 | return 0; |
| 848 | |
| 849 | if (ptrace_state.pe_report_event & PTRACE_VFORK) |
| 850 | { |
| 851 | *childpid = ptrace_state.pe_other_pid; |
| 852 | return 1; |
| 853 | } |
| 854 | |
| 855 | return 0; |
| 856 | #endif |
| 857 | } |
| 858 | |
| 859 | int |
| 860 | child_can_follow_vfork_prior_to_exec () |
| 861 | { |
| 862 | /* ptrace doesn't allow this. */ |
| 863 | return 0; |
| 864 | } |
| 865 | |
| 866 | int |
| 867 | child_insert_exec_catchpoint (pid) |
| 868 | int pid; |
| 869 | { |
| 870 | /* This request is only available on HPUX 10.0 and later. |
| 871 | */ |
| 872 | #if !defined(PT_SET_EVENT_MASK) |
| 873 | error ("Unable to catch execs prior to HPUX 10.0"); |
| 874 | |
| 875 | #else |
| 876 | /* Enable reporting of exec events from the kernel. */ |
| 877 | /* ??rehrauer: For the moment, we're always enabling these events, |
| 878 | and just ignoring them if there's no catchpoint to catch them. |
| 879 | */ |
| 880 | return 0; |
| 881 | #endif |
| 882 | } |
| 883 | |
| 884 | int |
| 885 | child_remove_exec_catchpoint (pid) |
| 886 | int pid; |
| 887 | { |
| 888 | /* This request is only available on HPUX 10.0 and later. |
| 889 | */ |
| 890 | #if !defined(PT_SET_EVENT_MASK) |
| 891 | error ("Unable to catch execs prior to HPUX 10.0"); |
| 892 | |
| 893 | #else |
| 894 | /* Disable reporting of exec events from the kernel. */ |
| 895 | /* ??rehrauer: For the moment, we're always enabling these events, |
| 896 | and just ignoring them if there's no catchpoint to catch them. |
| 897 | */ |
| 898 | return 0; |
| 899 | #endif |
| 900 | } |
| 901 | |
| 902 | int |
| 903 | child_has_execd (pid, execd_pathname) |
| 904 | int pid; |
| 905 | char ** execd_pathname; |
| 906 | { |
| 907 | |
| 908 | /* This request is only available on HPUX 10.0 and later. |
| 909 | */ |
| 910 | #if !defined(PT_GET_PROCESS_STATE) |
| 911 | *execd_pathname = NULL; |
| 912 | return 0; |
| 913 | |
| 914 | #else |
| 915 | int pt_status; |
| 916 | ptrace_state_t ptrace_state; |
| 917 | |
| 918 | errno = 0; |
| 919 | pt_status = call_ptrace (PT_GET_PROCESS_STATE, |
| 920 | pid, |
| 921 | (PTRACE_ARG3_TYPE) &ptrace_state, |
| 922 | sizeof (ptrace_state)); |
| 923 | if (errno) |
| 924 | perror_with_name ("ptrace"); |
| 925 | if (pt_status < 0) |
| 926 | return 0; |
| 927 | |
| 928 | if (ptrace_state.pe_report_event & PTRACE_EXEC) |
| 929 | { |
| 930 | char * exec_file = target_pid_to_exec_file (pid); |
| 931 | *execd_pathname = savestring (exec_file, strlen (exec_file)); |
| 932 | return 1; |
| 933 | } |
| 934 | |
| 935 | return 0; |
| 936 | #endif |
| 937 | } |
| 938 | |
| 939 | int |
| 940 | child_reported_exec_events_per_exec_call () |
| 941 | { |
| 942 | return 2; /* ptrace reports the event twice per call. */ |
| 943 | } |
| 944 | |
| 945 | int |
| 946 | child_has_syscall_event (pid, kind, syscall_id) |
| 947 | int pid; |
| 948 | enum target_waitkind *kind; |
| 949 | int *syscall_id; |
| 950 | { |
| 951 | /* This request is only available on HPUX 10.30 and later, via |
| 952 | the ttrace interface. */ |
| 953 | |
| 954 | *kind = TARGET_WAITKIND_SPURIOUS; |
| 955 | *syscall_id = -1; |
| 956 | return 0; |
| 957 | } |
| 958 | |
| 959 | char * |
| 960 | child_pid_to_exec_file (pid) |
| 961 | int pid; |
| 962 | { |
| 963 | static char exec_file_buffer[1024]; |
| 964 | int pt_status; |
| 965 | CORE_ADDR top_of_stack; |
| 966 | char four_chars[4]; |
| 967 | int name_index; |
| 968 | int i; |
| 969 | int saved_inferior_pid; |
| 970 | boolean done; |
| 971 | |
| 972 | #ifdef PT_GET_PROCESS_PATHNAME |
| 973 | /* As of 10.x HP-UX, there's an explicit request to get the pathname. */ |
| 974 | pt_status = call_ptrace (PT_GET_PROCESS_PATHNAME, |
| 975 | pid, |
| 976 | (PTRACE_ARG3_TYPE) exec_file_buffer, |
| 977 | sizeof (exec_file_buffer) - 1); |
| 978 | if (pt_status == 0) |
| 979 | return exec_file_buffer; |
| 980 | #endif |
| 981 | |
| 982 | /* It appears that this request is broken prior to 10.30. |
| 983 | If it fails, try a really, truly amazingly gross hack |
| 984 | that DDE uses, of pawing through the process' data |
| 985 | segment to find the pathname. */ |
| 986 | |
| 987 | top_of_stack = 0x7b03a000; |
| 988 | name_index = 0; |
| 989 | done = 0; |
| 990 | |
| 991 | /* On the chance that pid != inferior_pid, set inferior_pid |
| 992 | to pid, so that (grrrr!) implicit uses of inferior_pid get |
| 993 | the right id. */ |
| 994 | |
| 995 | saved_inferior_pid = inferior_pid; |
| 996 | inferior_pid = pid; |
| 997 | |
| 998 | /* Try to grab a null-terminated string. */ |
| 999 | while (! done) |
| 1000 | { |
| 1001 | if (target_read_memory (top_of_stack, four_chars, 4) != 0) |
| 1002 | { |
| 1003 | inferior_pid = saved_inferior_pid; |
| 1004 | return NULL; |
| 1005 | } |
| 1006 | for (i = 0; i < 4; i++) |
| 1007 | { |
| 1008 | exec_file_buffer[name_index++] = four_chars[i]; |
| 1009 | done = (four_chars[i] == '\0'); |
| 1010 | if (done) |
| 1011 | break; |
| 1012 | } |
| 1013 | top_of_stack += 4; |
| 1014 | } |
| 1015 | |
| 1016 | if (exec_file_buffer[0] == '\0') |
| 1017 | { |
| 1018 | inferior_pid = saved_inferior_pid; |
| 1019 | return NULL; |
| 1020 | } |
| 1021 | |
| 1022 | inferior_pid = saved_inferior_pid; |
| 1023 | return exec_file_buffer; |
| 1024 | } |
| 1025 | |
| 1026 | void |
| 1027 | pre_fork_inferior () |
| 1028 | { |
| 1029 | int status; |
| 1030 | |
| 1031 | status = pipe (startup_semaphore.parent_channel); |
| 1032 | if (status < 0) |
| 1033 | { |
| 1034 | warning ("error getting parent pipe for startup semaphore"); |
| 1035 | return; |
| 1036 | } |
| 1037 | |
| 1038 | status = pipe (startup_semaphore.child_channel); |
| 1039 | if (status < 0) |
| 1040 | { |
| 1041 | warning ("error getting child pipe for startup semaphore"); |
| 1042 | return; |
| 1043 | } |
| 1044 | } |
| 1045 | |
| 1046 | \f |
| 1047 | /* Check to see if the given thread is alive. |
| 1048 | |
| 1049 | This is a no-op, as ptrace doesn't support threads, so we just |
| 1050 | return "TRUE". */ |
| 1051 | |
| 1052 | int |
| 1053 | child_thread_alive (pid) |
| 1054 | int pid; |
| 1055 | { |
| 1056 | return 1; |
| 1057 | } |
| 1058 | |
| 1059 | #endif /* ! GDB_NATIVE_HPUX_11 */ |