Commit | Line | Data |
---|---|---|
c906108c | 1 | /* Native support code for HPUX PA-RISC. |
b83266a0 | 2 | Copyright 1986, 1987, 1989, 1990, 1991, 1992, 1993, 1998, 1999 |
c906108c SS |
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 | ||
c5aa993b | 8 | This file is part of GDB. |
c906108c | 9 | |
c5aa993b JM |
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. | |
c906108c | 14 | |
c5aa993b JM |
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. | |
c906108c | 19 | |
c5aa993b JM |
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, | |
23 | Boston, MA 02111-1307, USA. */ | |
c906108c SS |
24 | |
25 | ||
26 | #include "defs.h" | |
27 | #include "inferior.h" | |
28 | #include "target.h" | |
29 | #include <sys/ptrace.h> | |
30 | #include "gdbcore.h" | |
31 | #include <wait.h> | |
32 | #include <signal.h> | |
33 | ||
34 | extern CORE_ADDR text_end; | |
35 | ||
36 | static void fetch_register PARAMS ((int)); | |
37 | ||
38 | void | |
39 | fetch_inferior_registers (regno) | |
40 | int regno; | |
41 | { | |
42 | if (regno == -1) | |
43 | for (regno = 0; regno < NUM_REGS; regno++) | |
44 | fetch_register (regno); | |
45 | else | |
46 | fetch_register (regno); | |
47 | } | |
48 | ||
7be570e7 JM |
49 | /* Our own version of the offsetof macro, since we can't assume ANSI C. */ |
50 | #define HPPAH_OFFSETOF(type, member) ((int) (&((type *) 0)->member)) | |
51 | ||
c906108c SS |
52 | /* Store our register values back into the inferior. |
53 | If REGNO is -1, do this for all registers. | |
54 | Otherwise, REGNO specifies which register (so we can save time). */ | |
55 | ||
56 | void | |
57 | store_inferior_registers (regno) | |
58 | int regno; | |
59 | { | |
60 | register unsigned int regaddr; | |
61 | char buf[80]; | |
c906108c SS |
62 | register int i; |
63 | unsigned int offset = U_REGS_OFFSET; | |
64 | int scratch; | |
65 | ||
66 | if (regno >= 0) | |
67 | { | |
7be570e7 JM |
68 | unsigned int addr, len, offset; |
69 | ||
c906108c SS |
70 | if (CANNOT_STORE_REGISTER (regno)) |
71 | return; | |
7be570e7 JM |
72 | |
73 | offset = 0; | |
74 | len = REGISTER_RAW_SIZE (regno); | |
75 | ||
76 | /* Requests for register zero actually want the save_state's | |
77 | ss_flags member. As RM says: "Oh, what a hack!" */ | |
78 | if (regno == 0) | |
b83266a0 | 79 | { |
7be570e7 JM |
80 | save_state_t ss; |
81 | addr = HPPAH_OFFSETOF (save_state_t, ss_flags); | |
82 | len = sizeof (ss.ss_flags); | |
83 | ||
84 | /* Note that ss_flags is always an int, no matter what | |
85 | REGISTER_RAW_SIZE(0) says. Assuming all HP-UX PA machines | |
86 | are big-endian, put it at the least significant end of the | |
87 | value, and zap the rest of the buffer. */ | |
88 | offset = REGISTER_RAW_SIZE (0) - len; | |
89 | } | |
90 | ||
91 | /* Floating-point registers come from the ss_fpblock area. */ | |
92 | else if (regno >= FP0_REGNUM) | |
93 | addr = (HPPAH_OFFSETOF (save_state_t, ss_fpblock) | |
94 | + (REGISTER_BYTE (regno) - REGISTER_BYTE (FP0_REGNUM))); | |
95 | ||
96 | /* Wide registers come from the ss_wide area. | |
97 | I think it's more PC to test (ss_flags & SS_WIDEREGS) to select | |
98 | between ss_wide and ss_narrow than to use the raw register size. | |
99 | But checking ss_flags would require an extra ptrace call for | |
100 | every register reference. Bleah. */ | |
101 | else if (len == 8) | |
102 | addr = (HPPAH_OFFSETOF (save_state_t, ss_wide) | |
103 | + REGISTER_BYTE (regno)); | |
104 | ||
105 | /* Narrow registers come from the ss_narrow area. Note that | |
106 | ss_narrow starts with gr1, not gr0. */ | |
107 | else if (len == 4) | |
108 | addr = (HPPAH_OFFSETOF (save_state_t, ss_narrow) | |
109 | + (REGISTER_BYTE (regno) - REGISTER_BYTE (1))); | |
110 | else | |
111 | internal_error ("hppah-nat.c (write_register): unexpected register size"); | |
112 | ||
113 | #ifdef GDB_TARGET_IS_HPPA_20W | |
114 | /* Unbelieveable. The PC head and tail must be written in 64bit hunks | |
115 | or we will get an error. Worse yet, the oddball ptrace/ttrace | |
116 | layering will not allow us to perform a 64bit register store. | |
117 | ||
118 | What a crock. */ | |
119 | if (regno == PCOQ_HEAD_REGNUM || regno == PCOQ_TAIL_REGNUM && len == 8) | |
120 | { | |
121 | CORE_ADDR temp; | |
122 | ||
123 | temp = *(CORE_ADDR *)®isters[REGISTER_BYTE (regno)]; | |
124 | ||
125 | /* Set the priv level (stored in the low two bits of the PC. */ | |
126 | temp |= 0x3; | |
127 | ||
128 | ttrace_write_reg_64 (inferior_pid, (CORE_ADDR)addr, (CORE_ADDR)&temp); | |
129 | ||
130 | /* If we fail to write the PC, give a true error instead of | |
131 | just a warning. */ | |
b83266a0 SS |
132 | if (errno != 0) |
133 | { | |
7be570e7 JM |
134 | char *err = safe_strerror (errno); |
135 | char *msg = alloca (strlen (err) + 128); | |
136 | sprintf (msg, "writing `%s' register: %s", | |
137 | REGISTER_NAME (regno), err); | |
138 | perror_with_name (msg); | |
b83266a0 | 139 | } |
7be570e7 | 140 | return; |
b83266a0 | 141 | } |
7be570e7 JM |
142 | #endif |
143 | ||
144 | for (i = 0; i < len; i += sizeof (int)) | |
145 | { | |
146 | errno = 0; | |
147 | call_ptrace (PT_WUREGS, inferior_pid, (PTRACE_ARG3_TYPE) addr + i, | |
148 | *(int *) ®isters[REGISTER_BYTE (regno) + i]); | |
149 | if (errno != 0) | |
150 | { | |
151 | /* Warning, not error, in case we are attached; sometimes | |
152 | the kernel doesn't let us at the registers. */ | |
153 | char *err = safe_strerror (errno); | |
154 | char *msg = alloca (strlen (err) + 128); | |
155 | sprintf (msg, "reading `%s' register: %s", | |
156 | REGISTER_NAME (regno), err); | |
157 | /* If we fail to write the PC, give a true error instead of | |
158 | just a warning. */ | |
159 | if (regno == PCOQ_HEAD_REGNUM || regno == PCOQ_TAIL_REGNUM) | |
160 | perror_with_name (msg); | |
161 | else | |
c906108c | 162 | warning (msg); |
7be570e7 JM |
163 | return; |
164 | } | |
165 | } | |
c906108c SS |
166 | } |
167 | else | |
168 | for (regno = 0; regno < NUM_REGS; regno++) | |
169 | store_inferior_registers (regno); | |
170 | } | |
171 | ||
c906108c | 172 | |
adf40b2e | 173 | /* Fetch a register's value from the process's U area. */ |
c906108c SS |
174 | static void |
175 | fetch_register (regno) | |
176 | int regno; | |
177 | { | |
c906108c | 178 | char buf[MAX_REGISTER_RAW_SIZE]; |
adf40b2e JM |
179 | unsigned int addr, len, offset; |
180 | int i; | |
c906108c | 181 | |
adf40b2e JM |
182 | offset = 0; |
183 | len = REGISTER_RAW_SIZE (regno); | |
184 | ||
185 | /* Requests for register zero actually want the save_state's | |
186 | ss_flags member. As RM says: "Oh, what a hack!" */ | |
187 | if (regno == 0) | |
188 | { | |
189 | save_state_t ss; | |
190 | addr = HPPAH_OFFSETOF (save_state_t, ss_flags); | |
191 | len = sizeof (ss.ss_flags); | |
192 | ||
193 | /* Note that ss_flags is always an int, no matter what | |
194 | REGISTER_RAW_SIZE(0) says. Assuming all HP-UX PA machines | |
195 | are big-endian, put it at the least significant end of the | |
196 | value, and zap the rest of the buffer. */ | |
197 | offset = REGISTER_RAW_SIZE (0) - len; | |
198 | memset (buf, 0, sizeof (buf)); | |
199 | } | |
c906108c | 200 | |
adf40b2e JM |
201 | /* Floating-point registers come from the ss_fpblock area. */ |
202 | else if (regno >= FP0_REGNUM) | |
203 | addr = (HPPAH_OFFSETOF (save_state_t, ss_fpblock) | |
204 | + (REGISTER_BYTE (regno) - REGISTER_BYTE (FP0_REGNUM))); | |
205 | ||
206 | /* Wide registers come from the ss_wide area. | |
207 | I think it's more PC to test (ss_flags & SS_WIDEREGS) to select | |
208 | between ss_wide and ss_narrow than to use the raw register size. | |
209 | But checking ss_flags would require an extra ptrace call for | |
210 | every register reference. Bleah. */ | |
211 | else if (len == 8) | |
212 | addr = (HPPAH_OFFSETOF (save_state_t, ss_wide) | |
213 | + REGISTER_BYTE (regno)); | |
214 | ||
215 | /* Narrow registers come from the ss_narrow area. Note that | |
216 | ss_narrow starts with gr1, not gr0. */ | |
217 | else if (len == 4) | |
218 | addr = (HPPAH_OFFSETOF (save_state_t, ss_narrow) | |
219 | + (REGISTER_BYTE (regno) - REGISTER_BYTE (1))); | |
c906108c | 220 | |
adf40b2e | 221 | else |
96baa820 | 222 | internal_error ("hppa-nat.c (fetch_register): unexpected register size"); |
adf40b2e JM |
223 | |
224 | for (i = 0; i < len; i += sizeof (int)) | |
c906108c SS |
225 | { |
226 | errno = 0; | |
adf40b2e JM |
227 | /* Copy an int from the U area to buf. Fill the least |
228 | significant end if len != raw_size. */ | |
229 | * (int *) &buf[offset + i] = | |
230 | call_ptrace (PT_RUREGS, inferior_pid, | |
231 | (PTRACE_ARG3_TYPE) addr + i, 0); | |
c906108c SS |
232 | if (errno != 0) |
233 | { | |
adf40b2e JM |
234 | /* Warning, not error, in case we are attached; sometimes |
235 | the kernel doesn't let us at the registers. */ | |
c906108c SS |
236 | char *err = safe_strerror (errno); |
237 | char *msg = alloca (strlen (err) + 128); | |
adf40b2e JM |
238 | sprintf (msg, "reading `%s' register: %s", |
239 | REGISTER_NAME (regno), err); | |
c906108c | 240 | warning (msg); |
adf40b2e | 241 | return; |
c906108c SS |
242 | } |
243 | } | |
adf40b2e JM |
244 | |
245 | /* If we're reading an address from the instruction address queue, | |
246 | mask out the bottom two bits --- they contain the privilege | |
247 | level. */ | |
c906108c | 248 | if (regno == PCOQ_HEAD_REGNUM || regno == PCOQ_TAIL_REGNUM) |
adf40b2e JM |
249 | buf[len - 1] &= ~0x3; |
250 | ||
c906108c | 251 | supply_register (regno, buf); |
c906108c SS |
252 | } |
253 | ||
adf40b2e | 254 | |
c906108c SS |
255 | /* Copy LEN bytes to or from inferior's memory starting at MEMADDR |
256 | to debugger memory starting at MYADDR. Copy to inferior if | |
257 | WRITE is nonzero. | |
c5aa993b | 258 | |
c906108c SS |
259 | Returns the length copied, which is either the LEN argument or zero. |
260 | This xfer function does not do partial moves, since child_ops | |
261 | doesn't allow memory operations to cross below us in the target stack | |
262 | anyway. */ | |
263 | ||
264 | int | |
265 | child_xfer_memory (memaddr, myaddr, len, write, target) | |
266 | CORE_ADDR memaddr; | |
267 | char *myaddr; | |
268 | int len; | |
269 | int write; | |
c5aa993b | 270 | struct target_ops *target; /* ignored */ |
c906108c SS |
271 | { |
272 | register int i; | |
273 | /* Round starting address down to longword boundary. */ | |
a0b3c4fd | 274 | register CORE_ADDR addr = memaddr & - (CORE_ADDR)(sizeof (int)); |
c906108c SS |
275 | /* Round ending address up; get number of longwords that makes. */ |
276 | register int count | |
c5aa993b | 277 | = (((memaddr + len) - addr) + sizeof (int) - 1) / sizeof (int); |
c906108c | 278 | |
b83266a0 SS |
279 | /* Allocate buffer of that many longwords. |
280 | Note -- do not use alloca to allocate this buffer since there is no | |
281 | guarantee of when the buffer will actually be deallocated. | |
282 | ||
283 | This routine can be called over and over with the same call chain; | |
284 | this (in effect) would pile up all those alloca requests until a call | |
285 | to alloca was made from a point higher than this routine in the | |
286 | call chain. */ | |
c906108c SS |
287 | register int *buffer = (int *) xmalloc (count * sizeof (int)); |
288 | ||
289 | if (write) | |
290 | { | |
291 | /* Fill start and end extra bytes of buffer with existing memory data. */ | |
c5aa993b | 292 | if (addr != memaddr || len < (int) sizeof (int)) |
b83266a0 SS |
293 | { |
294 | /* Need part of initial word -- fetch it. */ | |
c5aa993b | 295 | buffer[0] = call_ptrace (addr < text_end ? PT_RIUSER : PT_RDUSER, |
b83266a0 SS |
296 | inferior_pid, (PTRACE_ARG3_TYPE) addr, 0); |
297 | } | |
c906108c SS |
298 | |
299 | if (count > 1) /* FIXME, avoid if even boundary */ | |
300 | { | |
301 | buffer[count - 1] | |
b83266a0 SS |
302 | = call_ptrace (addr < text_end ? PT_RIUSER : PT_RDUSER, |
303 | inferior_pid, | |
304 | (PTRACE_ARG3_TYPE) (addr | |
305 | + (count - 1) * sizeof (int)), | |
306 | 0); | |
c906108c SS |
307 | } |
308 | ||
309 | /* Copy data to be written over corresponding part of buffer */ | |
c906108c SS |
310 | memcpy ((char *) buffer + (memaddr & (sizeof (int) - 1)), myaddr, len); |
311 | ||
312 | /* Write the entire buffer. */ | |
c906108c SS |
313 | for (i = 0; i < count; i++, addr += sizeof (int)) |
314 | { | |
b83266a0 SS |
315 | int pt_status; |
316 | int pt_request; | |
317 | /* The HP-UX kernel crashes if you use PT_WDUSER to write into the | |
318 | text segment. FIXME -- does it work to write into the data | |
319 | segment using WIUSER, or do these idiots really expect us to | |
320 | figure out which segment the address is in, so we can use a | |
321 | separate system call for it??! */ | |
c906108c | 322 | errno = 0; |
b83266a0 | 323 | pt_request = (addr < text_end) ? PT_WIUSER : PT_WDUSER; |
c906108c | 324 | pt_status = call_ptrace (pt_request, |
c5aa993b | 325 | inferior_pid, |
b83266a0 SS |
326 | (PTRACE_ARG3_TYPE) addr, |
327 | buffer[i]); | |
328 | ||
329 | /* Did we fail? Might we've guessed wrong about which | |
330 | segment this address resides in? Try the other request, | |
331 | and see if that works... */ | |
332 | if ((pt_status == -1) && errno) | |
333 | { | |
334 | errno = 0; | |
335 | pt_request = (pt_request == PT_WIUSER) ? PT_WDUSER : PT_WIUSER; | |
336 | pt_status = call_ptrace (pt_request, | |
c5aa993b | 337 | inferior_pid, |
b83266a0 SS |
338 | (PTRACE_ARG3_TYPE) addr, |
339 | buffer[i]); | |
340 | ||
341 | /* No, we still fail. Okay, time to punt. */ | |
342 | if ((pt_status == -1) && errno) | |
343 | { | |
c5aa993b | 344 | free (buffer); |
b83266a0 SS |
345 | return 0; |
346 | } | |
347 | } | |
c906108c SS |
348 | } |
349 | } | |
350 | else | |
351 | { | |
352 | /* Read all the longwords */ | |
353 | for (i = 0; i < count; i++, addr += sizeof (int)) | |
354 | { | |
355 | errno = 0; | |
c5aa993b | 356 | buffer[i] = call_ptrace (addr < text_end ? PT_RIUSER : PT_RDUSER, |
b83266a0 SS |
357 | inferior_pid, (PTRACE_ARG3_TYPE) addr, 0); |
358 | if (errno) | |
359 | { | |
c5aa993b | 360 | free (buffer); |
b83266a0 SS |
361 | return 0; |
362 | } | |
c906108c SS |
363 | QUIT; |
364 | } | |
365 | ||
366 | /* Copy appropriate bytes out of the buffer. */ | |
367 | memcpy (myaddr, (char *) buffer + (memaddr & (sizeof (int) - 1)), len); | |
368 | } | |
c5aa993b | 369 | free (buffer); |
c906108c SS |
370 | return len; |
371 | } | |
372 | ||
373 | ||
374 | void | |
375 | child_post_follow_inferior_by_clone () | |
376 | { | |
b83266a0 | 377 | int status; |
c906108c SS |
378 | |
379 | /* This function is used when following both the parent and child | |
380 | of a fork. In this case, the debugger clones itself. The original | |
381 | debugger follows the parent, the clone follows the child. The | |
382 | original detaches from the child, delivering a SIGSTOP to it to | |
383 | keep it from running away until the clone can attach itself. | |
384 | ||
385 | At this point, the clone has attached to the child. Because of | |
386 | the SIGSTOP, we must now deliver a SIGCONT to the child, or it | |
387 | won't behave properly. */ | |
388 | status = kill (inferior_pid, SIGCONT); | |
389 | } | |
390 | ||
391 | ||
392 | void | |
393 | child_post_follow_vfork (parent_pid, followed_parent, child_pid, followed_child) | |
b83266a0 SS |
394 | int parent_pid; |
395 | int followed_parent; | |
396 | int child_pid; | |
397 | int followed_child; | |
c906108c | 398 | { |
c906108c SS |
399 | /* Are we a debugger that followed the parent of a vfork? If so, |
400 | then recall that the child's vfork event was delivered to us | |
401 | first. And, that the parent was suspended by the OS until the | |
402 | child's exec or exit events were received. | |
403 | ||
404 | Upon receiving that child vfork, then, we were forced to remove | |
405 | all breakpoints in the child and continue it so that it could | |
406 | reach the exec or exit point. | |
407 | ||
408 | But also recall that the parent and child of a vfork share the | |
409 | same address space. Thus, removing bp's in the child also | |
410 | removed them from the parent. | |
411 | ||
412 | Now that the child has safely exec'd or exited, we must restore | |
413 | the parent's breakpoints before we continue it. Else, we may | |
414 | cause it run past expected stopping points. */ | |
415 | if (followed_parent) | |
416 | { | |
417 | reattach_breakpoints (parent_pid); | |
418 | } | |
419 | ||
420 | /* Are we a debugger that followed the child of a vfork? If so, | |
421 | then recall that we don't actually acquire control of the child | |
b83266a0 | 422 | until after it has exec'd or exited. */ |
c906108c SS |
423 | if (followed_child) |
424 | { | |
425 | /* If the child has exited, then there's nothing for us to do. | |
c5aa993b JM |
426 | In the case of an exec event, we'll let that be handled by |
427 | the normal mechanism that notices and handles exec events, in | |
428 | resume(). */ | |
c906108c SS |
429 | } |
430 | } | |
431 | ||
b83266a0 SS |
432 | /* Format a process id, given PID. Be sure to terminate |
433 | this with a null--it's going to be printed via a "%s". */ | |
c906108c | 434 | char * |
b83266a0 | 435 | hppa_pid_to_str (pid) |
c5aa993b | 436 | pid_t pid; |
c906108c | 437 | { |
c5aa993b JM |
438 | /* Static because address returned */ |
439 | static char buf[30]; | |
c906108c | 440 | |
c5aa993b JM |
441 | /* Extra NULLs for paranoia's sake */ |
442 | sprintf (buf, "process %d\0\0\0\0", pid); | |
443 | ||
444 | return buf; | |
c906108c SS |
445 | } |
446 | ||
b83266a0 SS |
447 | /* Format a thread id, given TID. Be sure to terminate |
448 | this with a null--it's going to be printed via a "%s". | |
449 | ||
450 | Note: This is a core-gdb tid, not the actual system tid. | |
c5aa993b | 451 | See infttrace.c for details. */ |
c906108c | 452 | char * |
b83266a0 | 453 | hppa_tid_to_str (tid) |
c5aa993b | 454 | pid_t tid; |
c906108c | 455 | { |
c5aa993b JM |
456 | /* Static because address returned */ |
457 | static char buf[30]; | |
458 | ||
459 | /* Extra NULLs for paranoia's sake */ | |
460 | sprintf (buf, "system thread %d\0\0\0\0", tid); | |
c906108c | 461 | |
c5aa993b | 462 | return buf; |
c906108c SS |
463 | } |
464 | ||
465 | #if !defined (GDB_NATIVE_HPUX_11) | |
466 | ||
467 | /* The following code is a substitute for the infttrace.c versions used | |
468 | with ttrace() in HPUX 11. */ | |
469 | ||
470 | /* This value is an arbitrary integer. */ | |
471 | #define PT_VERSION 123456 | |
472 | ||
473 | /* This semaphore is used to coordinate the child and parent processes | |
474 | after a fork(), and before an exec() by the child. See | |
475 | parent_attach_all for details. */ | |
476 | ||
c5aa993b JM |
477 | typedef struct |
478 | { | |
479 | int parent_channel[2]; /* Parent "talks" to [1], child "listens" to [0] */ | |
480 | int child_channel[2]; /* Child "talks" to [1], parent "listens" to [0] */ | |
481 | } | |
482 | startup_semaphore_t; | |
c906108c SS |
483 | |
484 | #define SEM_TALK (1) | |
485 | #define SEM_LISTEN (0) | |
486 | ||
c5aa993b | 487 | static startup_semaphore_t startup_semaphore; |
c906108c SS |
488 | |
489 | extern int parent_attach_all PARAMS ((int, PTRACE_ARG3_TYPE, int)); | |
490 | ||
491 | #ifdef PT_SETTRC | |
492 | /* This function causes the caller's process to be traced by its | |
493 | parent. This is intended to be called after GDB forks itself, | |
494 | and before the child execs the target. | |
495 | ||
496 | Note that HP-UX ptrace is rather funky in how this is done. | |
497 | If the parent wants to get the initial exec event of a child, | |
498 | it must set the ptrace event mask of the child to include execs. | |
499 | (The child cannot do this itself.) This must be done after the | |
500 | child is forked, but before it execs. | |
501 | ||
502 | To coordinate the parent and child, we implement a semaphore using | |
503 | pipes. After SETTRC'ing itself, the child tells the parent that | |
504 | it is now traceable by the parent, and waits for the parent's | |
505 | acknowledgement. The parent can then set the child's event mask, | |
506 | and notify the child that it can now exec. | |
507 | ||
508 | (The acknowledgement by parent happens as a result of a call to | |
509 | child_acknowledge_created_inferior.) */ | |
510 | ||
511 | int | |
512 | parent_attach_all (pid, addr, data) | |
513 | int pid; | |
514 | PTRACE_ARG3_TYPE addr; | |
515 | int data; | |
516 | { | |
517 | int pt_status = 0; | |
518 | ||
519 | /* We need a memory home for a constant. */ | |
520 | int tc_magic_child = PT_VERSION; | |
521 | int tc_magic_parent = 0; | |
522 | ||
523 | /* The remainder of this function is only useful for HPUX 10.0 and | |
524 | later, as it depends upon the ability to request notification | |
525 | of specific kinds of events by the kernel. */ | |
526 | #if defined(PT_SET_EVENT_MASK) | |
527 | ||
528 | /* Notify the parent that we're potentially ready to exec(). */ | |
529 | write (startup_semaphore.child_channel[SEM_TALK], | |
b83266a0 SS |
530 | &tc_magic_child, |
531 | sizeof (tc_magic_child)); | |
c906108c SS |
532 | |
533 | /* Wait for acknowledgement from the parent. */ | |
534 | read (startup_semaphore.parent_channel[SEM_LISTEN], | |
b83266a0 SS |
535 | &tc_magic_parent, |
536 | sizeof (tc_magic_parent)); | |
c906108c | 537 | if (tc_magic_child != tc_magic_parent) |
c5aa993b | 538 | warning ("mismatched semaphore magic"); |
c906108c SS |
539 | |
540 | /* Discard our copy of the semaphore. */ | |
541 | (void) close (startup_semaphore.parent_channel[SEM_LISTEN]); | |
542 | (void) close (startup_semaphore.parent_channel[SEM_TALK]); | |
543 | (void) close (startup_semaphore.child_channel[SEM_LISTEN]); | |
544 | (void) close (startup_semaphore.child_channel[SEM_TALK]); | |
545 | #endif | |
c5aa993b | 546 | |
c906108c SS |
547 | return 0; |
548 | } | |
549 | #endif | |
550 | ||
551 | int | |
552 | hppa_require_attach (pid) | |
553 | int pid; | |
554 | { | |
555 | int pt_status; | |
b83266a0 SS |
556 | CORE_ADDR pc; |
557 | CORE_ADDR pc_addr; | |
c906108c SS |
558 | unsigned int regs_offset; |
559 | ||
560 | /* Are we already attached? There appears to be no explicit way to | |
561 | answer this via ptrace, so we try something which should be | |
562 | innocuous if we are attached. If that fails, then we assume | |
563 | we're not attached, and so attempt to make it so. */ | |
564 | ||
565 | errno = 0; | |
566 | regs_offset = U_REGS_OFFSET; | |
567 | pc_addr = register_addr (PC_REGNUM, regs_offset); | |
568 | pc = call_ptrace (PT_READ_U, pid, (PTRACE_ARG3_TYPE) pc_addr, 0); | |
569 | ||
570 | if (errno) | |
571 | { | |
572 | errno = 0; | |
573 | pt_status = call_ptrace (PT_ATTACH, pid, (PTRACE_ARG3_TYPE) 0, 0); | |
574 | ||
575 | if (errno) | |
b83266a0 | 576 | return -1; |
c906108c SS |
577 | |
578 | /* Now we really are attached. */ | |
579 | errno = 0; | |
580 | } | |
581 | attach_flag = 1; | |
582 | return pid; | |
583 | } | |
584 | ||
585 | int | |
586 | hppa_require_detach (pid, signal) | |
c5aa993b JM |
587 | int pid; |
588 | int signal; | |
c906108c SS |
589 | { |
590 | errno = 0; | |
591 | call_ptrace (PT_DETACH, pid, (PTRACE_ARG3_TYPE) 1, signal); | |
c5aa993b | 592 | errno = 0; /* Ignore any errors. */ |
c906108c SS |
593 | return pid; |
594 | } | |
595 | ||
596 | /* Since ptrace doesn't support memory page-protection events, which | |
597 | are used to implement "hardware" watchpoints on HP-UX, these are | |
598 | dummy versions, which perform no useful work. */ | |
599 | ||
600 | void | |
601 | hppa_enable_page_protection_events (pid) | |
602 | int pid; | |
603 | { | |
604 | } | |
605 | ||
606 | void | |
607 | hppa_disable_page_protection_events (pid) | |
608 | int pid; | |
609 | { | |
610 | } | |
611 | ||
612 | int | |
613 | hppa_insert_hw_watchpoint (pid, start, len, type) | |
614 | int pid; | |
615 | CORE_ADDR start; | |
616 | LONGEST len; | |
617 | int type; | |
618 | { | |
619 | error ("Hardware watchpoints not implemented on this platform."); | |
620 | } | |
621 | ||
622 | int | |
623 | hppa_remove_hw_watchpoint (pid, start, len, type) | |
624 | int pid; | |
625 | CORE_ADDR start; | |
626 | LONGEST len; | |
627 | enum bptype type; | |
628 | { | |
629 | error ("Hardware watchpoints not implemented on this platform."); | |
630 | } | |
631 | ||
632 | int | |
633 | hppa_can_use_hw_watchpoint (type, cnt, ot) | |
634 | enum bptype type; | |
635 | int cnt; | |
636 | enum bptype ot; | |
637 | { | |
638 | return 0; | |
639 | } | |
640 | ||
641 | int | |
642 | hppa_range_profitable_for_hw_watchpoint (pid, start, len) | |
643 | int pid; | |
644 | CORE_ADDR start; | |
645 | LONGEST len; | |
646 | { | |
647 | error ("Hardware watchpoints not implemented on this platform."); | |
648 | } | |
649 | ||
650 | char * | |
651 | hppa_pid_or_tid_to_str (id) | |
652 | pid_t id; | |
653 | { | |
654 | /* In the ptrace world, there are only processes. */ | |
655 | return hppa_pid_to_str (id); | |
656 | } | |
657 | ||
658 | /* This function has no meaning in a non-threaded world. Thus, we | |
659 | return 0 (FALSE). See the use of "hppa_prepare_to_proceed" in | |
660 | hppa-tdep.c. */ | |
661 | ||
662 | pid_t | |
663 | hppa_switched_threads (pid) | |
664 | pid_t pid; | |
665 | { | |
666 | return (pid_t) 0; | |
667 | } | |
668 | ||
669 | void | |
670 | hppa_ensure_vforking_parent_remains_stopped (pid) | |
671 | int pid; | |
672 | { | |
673 | /* This assumes that the vforked parent is presently stopped, and | |
674 | that the vforked child has just delivered its first exec event. | |
675 | Calling kill() this way will cause the SIGTRAP to be delivered as | |
676 | soon as the parent is resumed, which happens as soon as the | |
677 | vforked child is resumed. See wait_for_inferior for the use of | |
678 | this function. */ | |
679 | kill (pid, SIGTRAP); | |
680 | } | |
681 | ||
682 | int | |
683 | hppa_resume_execd_vforking_child_to_get_parent_vfork () | |
684 | { | |
c5aa993b | 685 | return 1; /* Yes, the child must be resumed. */ |
c906108c SS |
686 | } |
687 | ||
688 | void | |
689 | require_notification_of_events (pid) | |
b83266a0 | 690 | int pid; |
c906108c SS |
691 | { |
692 | #if defined(PT_SET_EVENT_MASK) | |
693 | int pt_status; | |
694 | ptrace_event_t ptrace_events; | |
695 | ||
696 | /* Instruct the kernel as to the set of events we wish to be | |
697 | informed of. (This support does not exist before HPUX 10.0. | |
698 | We'll assume if PT_SET_EVENT_MASK has not been defined by | |
b83266a0 | 699 | <sys/ptrace.h>, then we're being built on pre-10.0.) */ |
c906108c SS |
700 | memset (&ptrace_events, 0, sizeof (ptrace_events)); |
701 | ||
702 | /* Note: By default, all signals are visible to us. If we wish | |
703 | the kernel to keep certain signals hidden from us, we do it | |
704 | by calling sigdelset (ptrace_events.pe_signals, signal) for | |
b83266a0 | 705 | each such signal here, before doing PT_SET_EVENT_MASK. */ |
c906108c SS |
706 | sigemptyset (&ptrace_events.pe_signals); |
707 | ||
708 | ptrace_events.pe_set_event = 0; | |
709 | ||
710 | ptrace_events.pe_set_event |= PTRACE_SIGNAL; | |
711 | ptrace_events.pe_set_event |= PTRACE_EXEC; | |
712 | ptrace_events.pe_set_event |= PTRACE_FORK; | |
713 | ptrace_events.pe_set_event |= PTRACE_VFORK; | |
714 | /* ??rehrauer: Add this one when we're prepared to catch it... | |
c5aa993b JM |
715 | ptrace_events.pe_set_event |= PTRACE_EXIT; |
716 | */ | |
c906108c SS |
717 | |
718 | errno = 0; | |
719 | pt_status = call_ptrace (PT_SET_EVENT_MASK, | |
c5aa993b JM |
720 | pid, |
721 | (PTRACE_ARG3_TYPE) & ptrace_events, | |
722 | sizeof (ptrace_events)); | |
c906108c SS |
723 | if (errno) |
724 | perror_with_name ("ptrace"); | |
725 | if (pt_status < 0) | |
726 | return; | |
727 | #endif | |
728 | } | |
729 | ||
730 | void | |
731 | require_notification_of_exec_events (pid) | |
b83266a0 | 732 | int pid; |
c906108c SS |
733 | { |
734 | #if defined(PT_SET_EVENT_MASK) | |
735 | int pt_status; | |
736 | ptrace_event_t ptrace_events; | |
737 | ||
738 | /* Instruct the kernel as to the set of events we wish to be | |
739 | informed of. (This support does not exist before HPUX 10.0. | |
740 | We'll assume if PT_SET_EVENT_MASK has not been defined by | |
b83266a0 | 741 | <sys/ptrace.h>, then we're being built on pre-10.0.) */ |
c906108c SS |
742 | memset (&ptrace_events, 0, sizeof (ptrace_events)); |
743 | ||
744 | /* Note: By default, all signals are visible to us. If we wish | |
745 | the kernel to keep certain signals hidden from us, we do it | |
746 | by calling sigdelset (ptrace_events.pe_signals, signal) for | |
b83266a0 | 747 | each such signal here, before doing PT_SET_EVENT_MASK. */ |
c906108c SS |
748 | sigemptyset (&ptrace_events.pe_signals); |
749 | ||
750 | ptrace_events.pe_set_event = 0; | |
751 | ||
752 | ptrace_events.pe_set_event |= PTRACE_EXEC; | |
753 | /* ??rehrauer: Add this one when we're prepared to catch it... | |
c5aa993b JM |
754 | ptrace_events.pe_set_event |= PTRACE_EXIT; |
755 | */ | |
c906108c SS |
756 | |
757 | errno = 0; | |
758 | pt_status = call_ptrace (PT_SET_EVENT_MASK, | |
c5aa993b JM |
759 | pid, |
760 | (PTRACE_ARG3_TYPE) & ptrace_events, | |
761 | sizeof (ptrace_events)); | |
c906108c SS |
762 | if (errno) |
763 | perror_with_name ("ptrace"); | |
764 | if (pt_status < 0) | |
765 | return; | |
766 | #endif | |
767 | } | |
768 | ||
769 | /* This function is called by the parent process, with pid being the | |
770 | ID of the child process, after the debugger has forked. */ | |
771 | ||
772 | void | |
773 | child_acknowledge_created_inferior (pid) | |
b83266a0 | 774 | int pid; |
c906108c SS |
775 | { |
776 | /* We need a memory home for a constant. */ | |
777 | int tc_magic_parent = PT_VERSION; | |
778 | int tc_magic_child = 0; | |
779 | ||
b83266a0 SS |
780 | /* The remainder of this function is only useful for HPUX 10.0 and |
781 | later, as it depends upon the ability to request notification | |
782 | of specific kinds of events by the kernel. */ | |
783 | #if defined(PT_SET_EVENT_MASK) | |
c906108c SS |
784 | /* Wait for the child to tell us that it has forked. */ |
785 | read (startup_semaphore.child_channel[SEM_LISTEN], | |
b83266a0 | 786 | &tc_magic_child, |
c5aa993b | 787 | sizeof (tc_magic_child)); |
c906108c SS |
788 | |
789 | /* Notify the child that it can exec. | |
790 | ||
791 | In the infttrace.c variant of this function, we set the child's | |
792 | event mask after the fork but before the exec. In the ptrace | |
793 | world, it seems we can't set the event mask until after the exec. */ | |
c906108c | 794 | write (startup_semaphore.parent_channel[SEM_TALK], |
b83266a0 SS |
795 | &tc_magic_parent, |
796 | sizeof (tc_magic_parent)); | |
c906108c SS |
797 | |
798 | /* We'd better pause a bit before trying to set the event mask, | |
799 | though, to ensure that the exec has happened. We don't want to | |
800 | wait() on the child, because that'll screw up the upper layers | |
801 | of gdb's execution control that expect to see the exec event. | |
802 | ||
803 | After an exec, the child is no longer executing gdb code. Hence, | |
804 | we can't have yet another synchronization via the pipes. We'll | |
805 | just sleep for a second, and hope that's enough delay... */ | |
c906108c SS |
806 | sleep (1); |
807 | ||
808 | /* Instruct the kernel as to the set of events we wish to be | |
809 | informed of. */ | |
c906108c SS |
810 | require_notification_of_exec_events (pid); |
811 | ||
812 | /* Discard our copy of the semaphore. */ | |
813 | (void) close (startup_semaphore.parent_channel[SEM_LISTEN]); | |
814 | (void) close (startup_semaphore.parent_channel[SEM_TALK]); | |
815 | (void) close (startup_semaphore.child_channel[SEM_LISTEN]); | |
816 | (void) close (startup_semaphore.child_channel[SEM_TALK]); | |
b83266a0 | 817 | #endif |
c906108c SS |
818 | } |
819 | ||
820 | void | |
821 | child_post_startup_inferior (pid) | |
b83266a0 | 822 | int pid; |
c906108c SS |
823 | { |
824 | require_notification_of_events (pid); | |
825 | } | |
826 | ||
827 | void | |
828 | child_post_attach (pid) | |
b83266a0 | 829 | int pid; |
c906108c SS |
830 | { |
831 | require_notification_of_events (pid); | |
832 | } | |
833 | ||
834 | int | |
835 | child_insert_fork_catchpoint (pid) | |
b83266a0 | 836 | int pid; |
c906108c SS |
837 | { |
838 | /* This request is only available on HPUX 10.0 and later. */ | |
839 | #if !defined(PT_SET_EVENT_MASK) | |
840 | error ("Unable to catch forks prior to HPUX 10.0"); | |
841 | #else | |
842 | /* Enable reporting of fork events from the kernel. */ | |
843 | /* ??rehrauer: For the moment, we're always enabling these events, | |
b83266a0 | 844 | and just ignoring them if there's no catchpoint to catch them. */ |
c906108c SS |
845 | return 0; |
846 | #endif | |
847 | } | |
848 | ||
849 | int | |
850 | child_remove_fork_catchpoint (pid) | |
b83266a0 | 851 | int pid; |
c906108c SS |
852 | { |
853 | /* This request is only available on HPUX 10.0 and later. */ | |
854 | #if !defined(PT_SET_EVENT_MASK) | |
855 | error ("Unable to catch forks prior to HPUX 10.0"); | |
856 | #else | |
857 | /* Disable reporting of fork events from the kernel. */ | |
858 | /* ??rehrauer: For the moment, we're always enabling these events, | |
859 | and just ignoring them if there's no catchpoint to catch them. */ | |
860 | return 0; | |
861 | #endif | |
862 | } | |
863 | ||
864 | int | |
865 | child_insert_vfork_catchpoint (pid) | |
b83266a0 | 866 | int pid; |
c906108c SS |
867 | { |
868 | /* This request is only available on HPUX 10.0 and later. */ | |
869 | #if !defined(PT_SET_EVENT_MASK) | |
870 | error ("Unable to catch vforks prior to HPUX 10.0"); | |
871 | #else | |
872 | /* Enable reporting of vfork events from the kernel. */ | |
873 | /* ??rehrauer: For the moment, we're always enabling these events, | |
874 | and just ignoring them if there's no catchpoint to catch them. */ | |
875 | return 0; | |
876 | #endif | |
877 | } | |
878 | ||
879 | int | |
880 | child_remove_vfork_catchpoint (pid) | |
b83266a0 | 881 | int pid; |
c906108c SS |
882 | { |
883 | /* This request is only available on HPUX 10.0 and later. */ | |
884 | #if !defined(PT_SET_EVENT_MASK) | |
885 | error ("Unable to catch vforks prior to HPUX 10.0"); | |
886 | #else | |
887 | /* Disable reporting of vfork events from the kernel. */ | |
888 | /* ??rehrauer: For the moment, we're always enabling these events, | |
889 | and just ignoring them if there's no catchpoint to catch them. */ | |
890 | return 0; | |
891 | #endif | |
892 | } | |
893 | ||
894 | int | |
895 | child_has_forked (pid, childpid) | |
b83266a0 SS |
896 | int pid; |
897 | int *childpid; | |
c906108c SS |
898 | { |
899 | /* This request is only available on HPUX 10.0 and later. */ | |
900 | #if !defined(PT_GET_PROCESS_STATE) | |
901 | *childpid = 0; | |
902 | return 0; | |
903 | #else | |
904 | int pt_status; | |
c5aa993b | 905 | ptrace_state_t ptrace_state; |
c906108c SS |
906 | |
907 | errno = 0; | |
908 | pt_status = call_ptrace (PT_GET_PROCESS_STATE, | |
b83266a0 | 909 | pid, |
c5aa993b | 910 | (PTRACE_ARG3_TYPE) & ptrace_state, |
b83266a0 | 911 | sizeof (ptrace_state)); |
c906108c SS |
912 | if (errno) |
913 | perror_with_name ("ptrace"); | |
914 | if (pt_status < 0) | |
915 | return 0; | |
916 | ||
917 | if (ptrace_state.pe_report_event & PTRACE_FORK) | |
918 | { | |
919 | *childpid = ptrace_state.pe_other_pid; | |
920 | return 1; | |
921 | } | |
922 | ||
923 | return 0; | |
924 | #endif | |
925 | } | |
926 | ||
927 | int | |
928 | child_has_vforked (pid, childpid) | |
b83266a0 SS |
929 | int pid; |
930 | int *childpid; | |
c906108c SS |
931 | { |
932 | /* This request is only available on HPUX 10.0 and later. */ | |
933 | #if !defined(PT_GET_PROCESS_STATE) | |
934 | *childpid = 0; | |
935 | return 0; | |
936 | ||
937 | #else | |
938 | int pt_status; | |
c5aa993b | 939 | ptrace_state_t ptrace_state; |
c906108c SS |
940 | |
941 | errno = 0; | |
942 | pt_status = call_ptrace (PT_GET_PROCESS_STATE, | |
b83266a0 | 943 | pid, |
c5aa993b | 944 | (PTRACE_ARG3_TYPE) & ptrace_state, |
b83266a0 | 945 | sizeof (ptrace_state)); |
c906108c SS |
946 | if (errno) |
947 | perror_with_name ("ptrace"); | |
948 | if (pt_status < 0) | |
949 | return 0; | |
950 | ||
951 | if (ptrace_state.pe_report_event & PTRACE_VFORK) | |
952 | { | |
953 | *childpid = ptrace_state.pe_other_pid; | |
954 | return 1; | |
955 | } | |
956 | ||
957 | return 0; | |
958 | #endif | |
959 | } | |
960 | ||
961 | int | |
962 | child_can_follow_vfork_prior_to_exec () | |
963 | { | |
964 | /* ptrace doesn't allow this. */ | |
965 | return 0; | |
966 | } | |
967 | ||
968 | int | |
969 | child_insert_exec_catchpoint (pid) | |
b83266a0 | 970 | int pid; |
c906108c | 971 | { |
b83266a0 | 972 | /* This request is only available on HPUX 10.0 and later. */ |
c906108c SS |
973 | #if !defined(PT_SET_EVENT_MASK) |
974 | error ("Unable to catch execs prior to HPUX 10.0"); | |
975 | ||
976 | #else | |
b83266a0 | 977 | /* Enable reporting of exec events from the kernel. */ |
c906108c | 978 | /* ??rehrauer: For the moment, we're always enabling these events, |
b83266a0 | 979 | and just ignoring them if there's no catchpoint to catch them. */ |
c906108c SS |
980 | return 0; |
981 | #endif | |
982 | } | |
983 | ||
984 | int | |
985 | child_remove_exec_catchpoint (pid) | |
b83266a0 | 986 | int pid; |
c906108c | 987 | { |
b83266a0 | 988 | /* This request is only available on HPUX 10.0 and later. */ |
c906108c SS |
989 | #if !defined(PT_SET_EVENT_MASK) |
990 | error ("Unable to catch execs prior to HPUX 10.0"); | |
991 | ||
992 | #else | |
993 | /* Disable reporting of exec events from the kernel. */ | |
994 | /* ??rehrauer: For the moment, we're always enabling these events, | |
b83266a0 | 995 | and just ignoring them if there's no catchpoint to catch them. */ |
c906108c SS |
996 | return 0; |
997 | #endif | |
998 | } | |
999 | ||
1000 | int | |
1001 | child_has_execd (pid, execd_pathname) | |
b83266a0 SS |
1002 | int pid; |
1003 | char **execd_pathname; | |
c906108c | 1004 | { |
b83266a0 | 1005 | /* This request is only available on HPUX 10.0 and later. */ |
c906108c SS |
1006 | #if !defined(PT_GET_PROCESS_STATE) |
1007 | *execd_pathname = NULL; | |
1008 | return 0; | |
1009 | ||
1010 | #else | |
1011 | int pt_status; | |
c5aa993b | 1012 | ptrace_state_t ptrace_state; |
c906108c SS |
1013 | |
1014 | errno = 0; | |
1015 | pt_status = call_ptrace (PT_GET_PROCESS_STATE, | |
b83266a0 | 1016 | pid, |
c5aa993b | 1017 | (PTRACE_ARG3_TYPE) & ptrace_state, |
b83266a0 | 1018 | sizeof (ptrace_state)); |
c906108c SS |
1019 | if (errno) |
1020 | perror_with_name ("ptrace"); | |
1021 | if (pt_status < 0) | |
1022 | return 0; | |
1023 | ||
1024 | if (ptrace_state.pe_report_event & PTRACE_EXEC) | |
1025 | { | |
c5aa993b | 1026 | char *exec_file = target_pid_to_exec_file (pid); |
c906108c SS |
1027 | *execd_pathname = savestring (exec_file, strlen (exec_file)); |
1028 | return 1; | |
1029 | } | |
1030 | ||
1031 | return 0; | |
1032 | #endif | |
1033 | } | |
1034 | ||
1035 | int | |
1036 | child_reported_exec_events_per_exec_call () | |
1037 | { | |
c5aa993b | 1038 | return 2; /* ptrace reports the event twice per call. */ |
c906108c SS |
1039 | } |
1040 | ||
1041 | int | |
1042 | child_has_syscall_event (pid, kind, syscall_id) | |
1043 | int pid; | |
1044 | enum target_waitkind *kind; | |
1045 | int *syscall_id; | |
1046 | { | |
1047 | /* This request is only available on HPUX 10.30 and later, via | |
1048 | the ttrace interface. */ | |
1049 | ||
1050 | *kind = TARGET_WAITKIND_SPURIOUS; | |
1051 | *syscall_id = -1; | |
1052 | return 0; | |
1053 | } | |
1054 | ||
1055 | char * | |
1056 | child_pid_to_exec_file (pid) | |
b83266a0 | 1057 | int pid; |
c906108c | 1058 | { |
b83266a0 | 1059 | static char exec_file_buffer[1024]; |
c906108c | 1060 | int pt_status; |
b83266a0 SS |
1061 | CORE_ADDR top_of_stack; |
1062 | char four_chars[4]; | |
c906108c SS |
1063 | int name_index; |
1064 | int i; | |
1065 | int saved_inferior_pid; | |
b83266a0 | 1066 | boolean done; |
c5aa993b | 1067 | |
c906108c SS |
1068 | #ifdef PT_GET_PROCESS_PATHNAME |
1069 | /* As of 10.x HP-UX, there's an explicit request to get the pathname. */ | |
1070 | pt_status = call_ptrace (PT_GET_PROCESS_PATHNAME, | |
b83266a0 SS |
1071 | pid, |
1072 | (PTRACE_ARG3_TYPE) exec_file_buffer, | |
1073 | sizeof (exec_file_buffer) - 1); | |
c906108c SS |
1074 | if (pt_status == 0) |
1075 | return exec_file_buffer; | |
1076 | #endif | |
1077 | ||
1078 | /* It appears that this request is broken prior to 10.30. | |
1079 | If it fails, try a really, truly amazingly gross hack | |
1080 | that DDE uses, of pawing through the process' data | |
1081 | segment to find the pathname. */ | |
1082 | ||
1083 | top_of_stack = 0x7b03a000; | |
1084 | name_index = 0; | |
1085 | done = 0; | |
1086 | ||
1087 | /* On the chance that pid != inferior_pid, set inferior_pid | |
1088 | to pid, so that (grrrr!) implicit uses of inferior_pid get | |
1089 | the right id. */ | |
1090 | ||
1091 | saved_inferior_pid = inferior_pid; | |
1092 | inferior_pid = pid; | |
1093 | ||
1094 | /* Try to grab a null-terminated string. */ | |
c5aa993b | 1095 | while (!done) |
c906108c SS |
1096 | { |
1097 | if (target_read_memory (top_of_stack, four_chars, 4) != 0) | |
1098 | { | |
1099 | inferior_pid = saved_inferior_pid; | |
1100 | return NULL; | |
1101 | } | |
1102 | for (i = 0; i < 4; i++) | |
1103 | { | |
1104 | exec_file_buffer[name_index++] = four_chars[i]; | |
1105 | done = (four_chars[i] == '\0'); | |
1106 | if (done) | |
1107 | break; | |
1108 | } | |
1109 | top_of_stack += 4; | |
1110 | } | |
1111 | ||
1112 | if (exec_file_buffer[0] == '\0') | |
1113 | { | |
1114 | inferior_pid = saved_inferior_pid; | |
1115 | return NULL; | |
1116 | } | |
1117 | ||
1118 | inferior_pid = saved_inferior_pid; | |
1119 | return exec_file_buffer; | |
1120 | } | |
1121 | ||
1122 | void | |
1123 | pre_fork_inferior () | |
1124 | { | |
1125 | int status; | |
1126 | ||
1127 | status = pipe (startup_semaphore.parent_channel); | |
1128 | if (status < 0) | |
1129 | { | |
1130 | warning ("error getting parent pipe for startup semaphore"); | |
1131 | return; | |
1132 | } | |
1133 | ||
1134 | status = pipe (startup_semaphore.child_channel); | |
1135 | if (status < 0) | |
1136 | { | |
1137 | warning ("error getting child pipe for startup semaphore"); | |
1138 | return; | |
1139 | } | |
1140 | } | |
c906108c | 1141 | \f |
c5aa993b | 1142 | |
c906108c SS |
1143 | /* Check to see if the given thread is alive. |
1144 | ||
1145 | This is a no-op, as ptrace doesn't support threads, so we just | |
1146 | return "TRUE". */ | |
1147 | ||
1148 | int | |
1149 | child_thread_alive (pid) | |
1150 | int pid; | |
1151 | { | |
c5aa993b | 1152 | return 1; |
c906108c SS |
1153 | } |
1154 | ||
1155 | #endif /* ! GDB_NATIVE_HPUX_11 */ |