Commit | Line | Data |
---|---|---|
1df84f13 AC |
1 | /* Native support code for HPUX PA-RISC, for GDB the GNU debugger. |
2 | ||
3 | Copyright 1986, 1987, 1989, 1990, 1991, 1992, 1993, 1994, 1995, | |
4 | 1996, 1998, 1999, 2000, 2001, 2004 Free Software Foundation, Inc. | |
c906108c SS |
5 | |
6 | Contributed by the Center for Software Science at the | |
7 | University of Utah (pa-gdb-bugs@cs.utah.edu). | |
8 | ||
c5aa993b | 9 | This file is part of GDB. |
c906108c | 10 | |
c5aa993b JM |
11 | This program is free software; you can redistribute it and/or modify |
12 | it under the terms of the GNU General Public License as published by | |
13 | the Free Software Foundation; either version 2 of the License, or | |
14 | (at your option) any later version. | |
c906108c | 15 | |
c5aa993b JM |
16 | This program is distributed in the hope that it will be useful, |
17 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
18 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
19 | GNU General Public License for more details. | |
c906108c | 20 | |
c5aa993b JM |
21 | You should have received a copy of the GNU General Public License |
22 | along with this program; if not, write to the Free Software | |
23 | Foundation, Inc., 59 Temple Place - Suite 330, | |
24 | Boston, MA 02111-1307, USA. */ | |
c906108c SS |
25 | |
26 | ||
27 | #include "defs.h" | |
28 | #include "inferior.h" | |
29 | #include "target.h" | |
30 | #include <sys/ptrace.h> | |
31 | #include "gdbcore.h" | |
a526d713 | 32 | #include "gdb_wait.h" |
4e052eda | 33 | #include "regcache.h" |
65e82032 | 34 | #include "gdb_string.h" |
6d518969 | 35 | #include "infttrace.h" |
c906108c SS |
36 | #include <signal.h> |
37 | ||
34f75cc1 | 38 | #include "hppa-tdep.h" |
47932f85 | 39 | |
b9fbf434 AC |
40 | static CORE_ADDR text_end; |
41 | ||
42 | void | |
43 | deprecated_hpux_text_end (struct target_ops *exec_ops) | |
44 | { | |
45 | struct section_table *p; | |
46 | ||
47 | /* Set text_end to the highest address of the end of any readonly | |
48 | code section. */ | |
49 | /* FIXME: The comment above does not match the code. The code | |
50 | checks for sections with are either code *or* readonly. */ | |
51 | text_end = (CORE_ADDR) 0; | |
52 | for (p = exec_ops->to_sections; p < exec_ops->to_sections_end; p++) | |
53 | if (bfd_get_section_flags (p->bfd, p->the_bfd_section) | |
54 | & (SEC_CODE | SEC_READONLY)) | |
55 | { | |
56 | if (text_end < p->endaddr) | |
57 | text_end = p->endaddr; | |
58 | } | |
59 | } | |
60 | ||
61 | ||
a14ed312 | 62 | static void fetch_register (int); |
c906108c SS |
63 | |
64 | void | |
fba45db2 | 65 | fetch_inferior_registers (int regno) |
c906108c SS |
66 | { |
67 | if (regno == -1) | |
68 | for (regno = 0; regno < NUM_REGS; regno++) | |
69 | fetch_register (regno); | |
70 | else | |
71 | fetch_register (regno); | |
72 | } | |
73 | ||
7be570e7 JM |
74 | /* Our own version of the offsetof macro, since we can't assume ANSI C. */ |
75 | #define HPPAH_OFFSETOF(type, member) ((int) (&((type *) 0)->member)) | |
76 | ||
c906108c SS |
77 | /* Store our register values back into the inferior. |
78 | If REGNO is -1, do this for all registers. | |
79 | Otherwise, REGNO specifies which register (so we can save time). */ | |
80 | ||
81 | void | |
fba45db2 | 82 | store_inferior_registers (int regno) |
c906108c | 83 | { |
52f0bd74 | 84 | unsigned int regaddr; |
c906108c | 85 | char buf[80]; |
52f0bd74 | 86 | int i; |
c906108c SS |
87 | unsigned int offset = U_REGS_OFFSET; |
88 | int scratch; | |
89 | ||
90 | if (regno >= 0) | |
91 | { | |
7be570e7 JM |
92 | unsigned int addr, len, offset; |
93 | ||
c906108c SS |
94 | if (CANNOT_STORE_REGISTER (regno)) |
95 | return; | |
7be570e7 JM |
96 | |
97 | offset = 0; | |
3acba339 | 98 | len = register_size (current_gdbarch, regno); |
7be570e7 JM |
99 | |
100 | /* Requests for register zero actually want the save_state's | |
101 | ss_flags member. As RM says: "Oh, what a hack!" */ | |
102 | if (regno == 0) | |
b83266a0 | 103 | { |
7be570e7 JM |
104 | save_state_t ss; |
105 | addr = HPPAH_OFFSETOF (save_state_t, ss_flags); | |
106 | len = sizeof (ss.ss_flags); | |
107 | ||
108 | /* Note that ss_flags is always an int, no matter what | |
3acba339 AC |
109 | register_size (0) says. Assuming all HP-UX PA machines |
110 | are big-endian, put it at the least significant end of | |
111 | the value, and zap the rest of the buffer. */ | |
112 | offset = register_size (current_gdbarch, 0) - len; | |
7be570e7 JM |
113 | } |
114 | ||
115 | /* Floating-point registers come from the ss_fpblock area. */ | |
34f75cc1 | 116 | else if (regno >= HPPA_FP0_REGNUM) |
7be570e7 | 117 | addr = (HPPAH_OFFSETOF (save_state_t, ss_fpblock) |
34f75cc1 | 118 | + (DEPRECATED_REGISTER_BYTE (regno) - DEPRECATED_REGISTER_BYTE (HPPA_FP0_REGNUM))); |
7be570e7 JM |
119 | |
120 | /* Wide registers come from the ss_wide area. | |
121 | I think it's more PC to test (ss_flags & SS_WIDEREGS) to select | |
122 | between ss_wide and ss_narrow than to use the raw register size. | |
123 | But checking ss_flags would require an extra ptrace call for | |
124 | every register reference. Bleah. */ | |
125 | else if (len == 8) | |
126 | addr = (HPPAH_OFFSETOF (save_state_t, ss_wide) | |
62700349 | 127 | + DEPRECATED_REGISTER_BYTE (regno)); |
7be570e7 JM |
128 | |
129 | /* Narrow registers come from the ss_narrow area. Note that | |
130 | ss_narrow starts with gr1, not gr0. */ | |
131 | else if (len == 4) | |
132 | addr = (HPPAH_OFFSETOF (save_state_t, ss_narrow) | |
62700349 | 133 | + (DEPRECATED_REGISTER_BYTE (regno) - DEPRECATED_REGISTER_BYTE (1))); |
7be570e7 | 134 | else |
8e65ff28 AC |
135 | internal_error (__FILE__, __LINE__, |
136 | "hppah-nat.c (write_register): unexpected register size"); | |
7be570e7 JM |
137 | |
138 | #ifdef GDB_TARGET_IS_HPPA_20W | |
139 | /* Unbelieveable. The PC head and tail must be written in 64bit hunks | |
140 | or we will get an error. Worse yet, the oddball ptrace/ttrace | |
141 | layering will not allow us to perform a 64bit register store. | |
142 | ||
143 | What a crock. */ | |
d564a7d4 | 144 | if ((regno == HPPA_PCOQ_HEAD_REGNUM || regno == HPPA_PCOQ_TAIL_REGNUM) && len == 8) |
7be570e7 JM |
145 | { |
146 | CORE_ADDR temp; | |
147 | ||
d564a7d4 | 148 | regcache_raw_read (current_regcache, regno, &temp); |
7be570e7 JM |
149 | |
150 | /* Set the priv level (stored in the low two bits of the PC. */ | |
151 | temp |= 0x3; | |
152 | ||
39f77062 KB |
153 | ttrace_write_reg_64 (PIDGET (inferior_ptid), (CORE_ADDR)addr, |
154 | (CORE_ADDR)&temp); | |
7be570e7 JM |
155 | |
156 | /* If we fail to write the PC, give a true error instead of | |
157 | just a warning. */ | |
d564a7d4 | 158 | if (errno != 0) |
b83266a0 | 159 | { |
7be570e7 JM |
160 | char *err = safe_strerror (errno); |
161 | char *msg = alloca (strlen (err) + 128); | |
162 | sprintf (msg, "writing `%s' register: %s", | |
163 | REGISTER_NAME (regno), err); | |
164 | perror_with_name (msg); | |
b83266a0 | 165 | } |
7be570e7 | 166 | return; |
b83266a0 | 167 | } |
53a5351d JM |
168 | |
169 | /* Another crock. HPUX complains if you write a nonzero value to | |
170 | the high part of IPSW. What will it take for HP to catch a | |
171 | clue about building sensible interfaces? */ | |
34f75cc1 | 172 | if (regno == HPPA_IPSW_REGNUM && len == 8) |
d564a7d4 DA |
173 | { |
174 | int temp = 0; | |
175 | ||
176 | regcache_raw_write_part (current_regcache, regno, 0, | |
177 | sizeof (int), &temp); | |
178 | } | |
7be570e7 JM |
179 | #endif |
180 | ||
181 | for (i = 0; i < len; i += sizeof (int)) | |
182 | { | |
d564a7d4 DA |
183 | int temp; |
184 | ||
7be570e7 | 185 | errno = 0; |
d564a7d4 DA |
186 | regcache_raw_read_part (current_regcache, regno, i, |
187 | sizeof (int), &temp); | |
39f77062 KB |
188 | call_ptrace (PT_WUREGS, PIDGET (inferior_ptid), |
189 | (PTRACE_ARG3_TYPE) addr + i, | |
d564a7d4 | 190 | temp); |
7be570e7 JM |
191 | if (errno != 0) |
192 | { | |
193 | /* Warning, not error, in case we are attached; sometimes | |
194 | the kernel doesn't let us at the registers. */ | |
195 | char *err = safe_strerror (errno); | |
196 | char *msg = alloca (strlen (err) + 128); | |
53a5351d | 197 | sprintf (msg, "writing `%s' register: %s", |
7be570e7 JM |
198 | REGISTER_NAME (regno), err); |
199 | /* If we fail to write the PC, give a true error instead of | |
200 | just a warning. */ | |
34f75cc1 | 201 | if (regno == HPPA_PCOQ_HEAD_REGNUM || regno == HPPA_PCOQ_TAIL_REGNUM) |
7be570e7 JM |
202 | perror_with_name (msg); |
203 | else | |
c906108c | 204 | warning (msg); |
7be570e7 JM |
205 | return; |
206 | } | |
207 | } | |
c906108c SS |
208 | } |
209 | else | |
210 | for (regno = 0; regno < NUM_REGS; regno++) | |
211 | store_inferior_registers (regno); | |
212 | } | |
213 | ||
c906108c | 214 | |
adf40b2e | 215 | /* Fetch a register's value from the process's U area. */ |
c906108c | 216 | static void |
fba45db2 | 217 | fetch_register (int regno) |
c906108c | 218 | { |
123a958e | 219 | char buf[MAX_REGISTER_SIZE]; |
adf40b2e JM |
220 | unsigned int addr, len, offset; |
221 | int i; | |
c906108c | 222 | |
adf40b2e | 223 | offset = 0; |
3acba339 | 224 | len = register_size (current_gdbarch, regno); |
adf40b2e JM |
225 | |
226 | /* Requests for register zero actually want the save_state's | |
227 | ss_flags member. As RM says: "Oh, what a hack!" */ | |
228 | if (regno == 0) | |
229 | { | |
230 | save_state_t ss; | |
231 | addr = HPPAH_OFFSETOF (save_state_t, ss_flags); | |
232 | len = sizeof (ss.ss_flags); | |
233 | ||
234 | /* Note that ss_flags is always an int, no matter what | |
3acba339 AC |
235 | register_size (0) says. Assuming all HP-UX PA machines are |
236 | big-endian, put it at the least significant end of the value, | |
237 | and zap the rest of the buffer. */ | |
238 | offset = register_size (current_gdbarch, 0) - len; | |
adf40b2e JM |
239 | memset (buf, 0, sizeof (buf)); |
240 | } | |
c906108c | 241 | |
adf40b2e | 242 | /* Floating-point registers come from the ss_fpblock area. */ |
34f75cc1 | 243 | else if (regno >= HPPA_FP0_REGNUM) |
adf40b2e | 244 | addr = (HPPAH_OFFSETOF (save_state_t, ss_fpblock) |
34f75cc1 | 245 | + (DEPRECATED_REGISTER_BYTE (regno) - DEPRECATED_REGISTER_BYTE (HPPA_FP0_REGNUM))); |
adf40b2e JM |
246 | |
247 | /* Wide registers come from the ss_wide area. | |
248 | I think it's more PC to test (ss_flags & SS_WIDEREGS) to select | |
249 | between ss_wide and ss_narrow than to use the raw register size. | |
250 | But checking ss_flags would require an extra ptrace call for | |
251 | every register reference. Bleah. */ | |
252 | else if (len == 8) | |
253 | addr = (HPPAH_OFFSETOF (save_state_t, ss_wide) | |
62700349 | 254 | + DEPRECATED_REGISTER_BYTE (regno)); |
adf40b2e JM |
255 | |
256 | /* Narrow registers come from the ss_narrow area. Note that | |
257 | ss_narrow starts with gr1, not gr0. */ | |
258 | else if (len == 4) | |
259 | addr = (HPPAH_OFFSETOF (save_state_t, ss_narrow) | |
62700349 | 260 | + (DEPRECATED_REGISTER_BYTE (regno) - DEPRECATED_REGISTER_BYTE (1))); |
c906108c | 261 | |
adf40b2e | 262 | else |
8e65ff28 AC |
263 | internal_error (__FILE__, __LINE__, |
264 | "hppa-nat.c (fetch_register): unexpected register size"); | |
adf40b2e JM |
265 | |
266 | for (i = 0; i < len; i += sizeof (int)) | |
c906108c SS |
267 | { |
268 | errno = 0; | |
adf40b2e JM |
269 | /* Copy an int from the U area to buf. Fill the least |
270 | significant end if len != raw_size. */ | |
271 | * (int *) &buf[offset + i] = | |
39f77062 | 272 | call_ptrace (PT_RUREGS, PIDGET (inferior_ptid), |
adf40b2e | 273 | (PTRACE_ARG3_TYPE) addr + i, 0); |
c906108c SS |
274 | if (errno != 0) |
275 | { | |
adf40b2e JM |
276 | /* Warning, not error, in case we are attached; sometimes |
277 | the kernel doesn't let us at the registers. */ | |
c906108c SS |
278 | char *err = safe_strerror (errno); |
279 | char *msg = alloca (strlen (err) + 128); | |
adf40b2e JM |
280 | sprintf (msg, "reading `%s' register: %s", |
281 | REGISTER_NAME (regno), err); | |
c906108c | 282 | warning (msg); |
adf40b2e | 283 | return; |
c906108c SS |
284 | } |
285 | } | |
adf40b2e JM |
286 | |
287 | /* If we're reading an address from the instruction address queue, | |
288 | mask out the bottom two bits --- they contain the privilege | |
289 | level. */ | |
34f75cc1 | 290 | if (regno == HPPA_PCOQ_HEAD_REGNUM || regno == HPPA_PCOQ_TAIL_REGNUM) |
adf40b2e JM |
291 | buf[len - 1] &= ~0x3; |
292 | ||
23a6d369 | 293 | regcache_raw_supply (current_regcache, regno, buf); |
c906108c SS |
294 | } |
295 | ||
adf40b2e | 296 | |
c906108c SS |
297 | /* Copy LEN bytes to or from inferior's memory starting at MEMADDR |
298 | to debugger memory starting at MYADDR. Copy to inferior if | |
299 | WRITE is nonzero. | |
c5aa993b | 300 | |
1df84f13 AC |
301 | Returns the length copied, which is either the LEN argument or |
302 | zero. This xfer function does not do partial moves, since | |
303 | deprecated_child_ops doesn't allow memory operations to cross below | |
304 | us in the target stack anyway. TARGET is ignored. */ | |
c906108c SS |
305 | |
306 | int | |
8fef05cc | 307 | child_xfer_memory (CORE_ADDR memaddr, char *myaddr, int len, int write, |
240be855 | 308 | struct mem_attrib *mem, |
8fef05cc | 309 | struct target_ops *target) |
c906108c | 310 | { |
52f0bd74 | 311 | int i; |
c906108c | 312 | /* Round starting address down to longword boundary. */ |
52f0bd74 | 313 | CORE_ADDR addr = memaddr & - (CORE_ADDR)(sizeof (int)); |
c906108c | 314 | /* Round ending address up; get number of longwords that makes. */ |
52f0bd74 | 315 | int count |
c5aa993b | 316 | = (((memaddr + len) - addr) + sizeof (int) - 1) / sizeof (int); |
c906108c | 317 | |
b83266a0 SS |
318 | /* Allocate buffer of that many longwords. |
319 | Note -- do not use alloca to allocate this buffer since there is no | |
320 | guarantee of when the buffer will actually be deallocated. | |
321 | ||
322 | This routine can be called over and over with the same call chain; | |
323 | this (in effect) would pile up all those alloca requests until a call | |
324 | to alloca was made from a point higher than this routine in the | |
325 | call chain. */ | |
52f0bd74 | 326 | int *buffer = (int *) xmalloc (count * sizeof (int)); |
c906108c SS |
327 | |
328 | if (write) | |
329 | { | |
330 | /* Fill start and end extra bytes of buffer with existing memory data. */ | |
c5aa993b | 331 | if (addr != memaddr || len < (int) sizeof (int)) |
b83266a0 SS |
332 | { |
333 | /* Need part of initial word -- fetch it. */ | |
c5aa993b | 334 | buffer[0] = call_ptrace (addr < text_end ? PT_RIUSER : PT_RDUSER, |
39f77062 KB |
335 | PIDGET (inferior_ptid), |
336 | (PTRACE_ARG3_TYPE) addr, 0); | |
b83266a0 | 337 | } |
c906108c SS |
338 | |
339 | if (count > 1) /* FIXME, avoid if even boundary */ | |
340 | { | |
341 | buffer[count - 1] | |
b83266a0 | 342 | = call_ptrace (addr < text_end ? PT_RIUSER : PT_RDUSER, |
39f77062 | 343 | PIDGET (inferior_ptid), |
b83266a0 SS |
344 | (PTRACE_ARG3_TYPE) (addr |
345 | + (count - 1) * sizeof (int)), | |
346 | 0); | |
c906108c SS |
347 | } |
348 | ||
349 | /* Copy data to be written over corresponding part of buffer */ | |
c906108c SS |
350 | memcpy ((char *) buffer + (memaddr & (sizeof (int) - 1)), myaddr, len); |
351 | ||
352 | /* Write the entire buffer. */ | |
c906108c SS |
353 | for (i = 0; i < count; i++, addr += sizeof (int)) |
354 | { | |
b83266a0 SS |
355 | int pt_status; |
356 | int pt_request; | |
357 | /* The HP-UX kernel crashes if you use PT_WDUSER to write into the | |
358 | text segment. FIXME -- does it work to write into the data | |
359 | segment using WIUSER, or do these idiots really expect us to | |
360 | figure out which segment the address is in, so we can use a | |
361 | separate system call for it??! */ | |
c906108c | 362 | errno = 0; |
b83266a0 | 363 | pt_request = (addr < text_end) ? PT_WIUSER : PT_WDUSER; |
c906108c | 364 | pt_status = call_ptrace (pt_request, |
39f77062 | 365 | PIDGET (inferior_ptid), |
b83266a0 SS |
366 | (PTRACE_ARG3_TYPE) addr, |
367 | buffer[i]); | |
368 | ||
369 | /* Did we fail? Might we've guessed wrong about which | |
370 | segment this address resides in? Try the other request, | |
371 | and see if that works... */ | |
372 | if ((pt_status == -1) && errno) | |
373 | { | |
374 | errno = 0; | |
375 | pt_request = (pt_request == PT_WIUSER) ? PT_WDUSER : PT_WIUSER; | |
376 | pt_status = call_ptrace (pt_request, | |
39f77062 | 377 | PIDGET (inferior_ptid), |
b83266a0 SS |
378 | (PTRACE_ARG3_TYPE) addr, |
379 | buffer[i]); | |
380 | ||
381 | /* No, we still fail. Okay, time to punt. */ | |
382 | if ((pt_status == -1) && errno) | |
383 | { | |
b8c9b27d | 384 | xfree (buffer); |
b83266a0 SS |
385 | return 0; |
386 | } | |
387 | } | |
c906108c SS |
388 | } |
389 | } | |
390 | else | |
391 | { | |
392 | /* Read all the longwords */ | |
393 | for (i = 0; i < count; i++, addr += sizeof (int)) | |
394 | { | |
395 | errno = 0; | |
c5aa993b | 396 | buffer[i] = call_ptrace (addr < text_end ? PT_RIUSER : PT_RDUSER, |
39f77062 KB |
397 | PIDGET (inferior_ptid), |
398 | (PTRACE_ARG3_TYPE) addr, 0); | |
b83266a0 SS |
399 | if (errno) |
400 | { | |
b8c9b27d | 401 | xfree (buffer); |
b83266a0 SS |
402 | return 0; |
403 | } | |
c906108c SS |
404 | QUIT; |
405 | } | |
406 | ||
407 | /* Copy appropriate bytes out of the buffer. */ | |
408 | memcpy (myaddr, (char *) buffer + (memaddr & (sizeof (int) - 1)), len); | |
409 | } | |
b8c9b27d | 410 | xfree (buffer); |
c906108c SS |
411 | return len; |
412 | } | |
413 | ||
7d2830a3 | 414 | char *saved_child_execd_pathname = NULL; |
6604731b | 415 | int saved_vfork_pid; |
7d2830a3 DJ |
416 | enum { |
417 | STATE_NONE, | |
418 | STATE_GOT_CHILD, | |
419 | STATE_GOT_EXEC, | |
420 | STATE_GOT_PARENT, | |
421 | STATE_FAKE_EXEC | |
422 | } saved_vfork_state = STATE_NONE; | |
c906108c | 423 | |
6604731b DJ |
424 | int |
425 | child_follow_fork (int follow_child) | |
c906108c | 426 | { |
6604731b DJ |
427 | ptid_t last_ptid; |
428 | struct target_waitstatus last_status; | |
429 | int has_vforked; | |
430 | int parent_pid, child_pid; | |
431 | ||
432 | get_last_target_status (&last_ptid, &last_status); | |
433 | has_vforked = (last_status.kind == TARGET_WAITKIND_VFORKED); | |
434 | parent_pid = ptid_get_pid (last_ptid); | |
435 | child_pid = last_status.value.related_pid; | |
436 | ||
437 | /* At this point, if we are vforking, breakpoints were already | |
438 | detached from the child in child_wait; and the child has already | |
439 | called execve(). If we are forking, both the parent and child | |
440 | have breakpoints inserted. */ | |
441 | ||
442 | if (! follow_child) | |
c906108c | 443 | { |
6604731b DJ |
444 | if (! has_vforked) |
445 | { | |
446 | detach_breakpoints (child_pid); | |
447 | #ifdef SOLIB_REMOVE_INFERIOR_HOOK | |
448 | SOLIB_REMOVE_INFERIOR_HOOK (child_pid); | |
449 | #endif | |
450 | } | |
451 | ||
452 | /* Detach from the child. */ | |
4c9ba7e0 DJ |
453 | printf_unfiltered ("Detaching after fork from %s\n", |
454 | target_pid_to_str (pid_to_ptid (child_pid))); | |
455 | hppa_require_detach (child_pid, 0); | |
6604731b DJ |
456 | |
457 | /* The parent and child of a vfork share the same address space. | |
458 | Also, on some targets the order in which vfork and exec events | |
459 | are received for parent in child requires some delicate handling | |
460 | of the events. | |
461 | ||
462 | For instance, on ptrace-based HPUX we receive the child's vfork | |
463 | event first, at which time the parent has been suspended by the | |
464 | OS and is essentially untouchable until the child's exit or second | |
465 | exec event arrives. At that time, the parent's vfork event is | |
466 | delivered to us, and that's when we see and decide how to follow | |
467 | the vfork. But to get to that point, we must continue the child | |
468 | until it execs or exits. To do that smoothly, all breakpoints | |
469 | must be removed from the child, in case there are any set between | |
470 | the vfork() and exec() calls. But removing them from the child | |
471 | also removes them from the parent, due to the shared-address-space | |
472 | nature of a vfork'd parent and child. On HPUX, therefore, we must | |
473 | take care to restore the bp's to the parent before we continue it. | |
474 | Else, it's likely that we may not stop in the expected place. (The | |
475 | worst scenario is when the user tries to step over a vfork() call; | |
476 | the step-resume bp must be restored for the step to properly stop | |
477 | in the parent after the call completes!) | |
478 | ||
479 | Sequence of events, as reported to gdb from HPUX: | |
480 | ||
481 | Parent Child Action for gdb to take | |
482 | ------------------------------------------------------- | |
483 | 1 VFORK Continue child | |
484 | 2 EXEC | |
485 | 3 EXEC or EXIT | |
486 | 4 VFORK | |
487 | ||
488 | Now that the child has safely exec'd or exited, we must restore | |
489 | the parent's breakpoints before we continue it. Else, we may | |
490 | cause it run past expected stopping points. */ | |
491 | ||
492 | if (has_vforked) | |
493 | reattach_breakpoints (parent_pid); | |
c906108c | 494 | } |
6604731b DJ |
495 | else |
496 | { | |
6604731b DJ |
497 | /* Needed to keep the breakpoint lists in sync. */ |
498 | if (! has_vforked) | |
499 | detach_breakpoints (child_pid); | |
7d2830a3 | 500 | |
6604731b DJ |
501 | /* Before detaching from the parent, remove all breakpoints from it. */ |
502 | remove_breakpoints (); | |
503 | ||
504 | /* Also reset the solib inferior hook from the parent. */ | |
505 | #ifdef SOLIB_REMOVE_INFERIOR_HOOK | |
506 | SOLIB_REMOVE_INFERIOR_HOOK (PIDGET (inferior_ptid)); | |
507 | #endif | |
7d2830a3 | 508 | |
6604731b DJ |
509 | /* Detach from the parent. */ |
510 | target_detach (NULL, 1); | |
511 | ||
512 | /* Attach to the child. */ | |
4c9ba7e0 DJ |
513 | printf_unfiltered ("Attaching after fork to %s\n", |
514 | target_pid_to_str (pid_to_ptid (child_pid))); | |
515 | hppa_require_attach (child_pid); | |
6604731b | 516 | inferior_ptid = pid_to_ptid (child_pid); |
6604731b DJ |
517 | |
518 | /* If we vforked, then we've also execed by now. The exec will be | |
519 | reported momentarily. follow_exec () will handle breakpoints, so | |
520 | we don't have to.. */ | |
521 | if (!has_vforked) | |
522 | follow_inferior_reset_breakpoints (); | |
523 | } | |
524 | ||
525 | if (has_vforked) | |
c906108c | 526 | { |
6604731b DJ |
527 | /* If we followed the parent, don't try to follow the child's exec. */ |
528 | if (saved_vfork_state != STATE_GOT_PARENT | |
529 | && saved_vfork_state != STATE_FAKE_EXEC) | |
530 | fprintf_unfiltered (gdb_stdout, | |
531 | "hppa: post follow vfork: confused state\n"); | |
532 | ||
533 | if (! follow_child || saved_vfork_state == STATE_GOT_PARENT) | |
534 | saved_vfork_state = STATE_NONE; | |
535 | else | |
536 | return 1; | |
c906108c | 537 | } |
6604731b | 538 | return 0; |
c906108c SS |
539 | } |
540 | ||
b83266a0 SS |
541 | /* Format a process id, given PID. Be sure to terminate |
542 | this with a null--it's going to be printed via a "%s". */ | |
c906108c | 543 | char * |
39f77062 | 544 | child_pid_to_str (ptid_t ptid) |
c906108c | 545 | { |
c5aa993b JM |
546 | /* Static because address returned */ |
547 | static char buf[30]; | |
39f77062 | 548 | pid_t pid = PIDGET (ptid); |
c906108c | 549 | |
ce414844 AC |
550 | /* Extra NUL for paranoia's sake */ |
551 | sprintf (buf, "process %d%c", pid, '\0'); | |
c5aa993b JM |
552 | |
553 | return buf; | |
c906108c SS |
554 | } |
555 | ||
b83266a0 SS |
556 | /* Format a thread id, given TID. Be sure to terminate |
557 | this with a null--it's going to be printed via a "%s". | |
558 | ||
559 | Note: This is a core-gdb tid, not the actual system tid. | |
c5aa993b | 560 | See infttrace.c for details. */ |
c906108c | 561 | char * |
39f77062 | 562 | hppa_tid_to_str (ptid_t ptid) |
c906108c | 563 | { |
c5aa993b JM |
564 | /* Static because address returned */ |
565 | static char buf[30]; | |
39f77062 KB |
566 | /* This seems strange, but when I did the ptid conversion, it looked |
567 | as though a pid was always being passed. - Kevin Buettner */ | |
568 | pid_t tid = PIDGET (ptid); | |
c5aa993b JM |
569 | |
570 | /* Extra NULLs for paranoia's sake */ | |
ce414844 | 571 | sprintf (buf, "system thread %d%c", tid, '\0'); |
c906108c | 572 | |
c5aa993b | 573 | return buf; |
c906108c SS |
574 | } |
575 | ||
47932f85 DJ |
576 | /*## */ |
577 | /* Enable HACK for ttrace work. In | |
578 | * infttrace.c/require_notification_of_events, | |
579 | * this is set to 0 so that the loop in child_wait | |
580 | * won't loop. | |
581 | */ | |
582 | int not_same_real_pid = 1; | |
583 | /*## */ | |
584 | ||
47932f85 DJ |
585 | /* Wait for child to do something. Return pid of child, or -1 in case |
586 | of error; store status through argument pointer OURSTATUS. */ | |
587 | ||
588 | ptid_t | |
589 | child_wait (ptid_t ptid, struct target_waitstatus *ourstatus) | |
590 | { | |
591 | int save_errno; | |
592 | int status; | |
593 | char *execd_pathname = NULL; | |
594 | int exit_status; | |
595 | int related_pid; | |
596 | int syscall_id; | |
597 | enum target_waitkind kind; | |
598 | int pid; | |
599 | ||
7d2830a3 DJ |
600 | if (saved_vfork_state == STATE_FAKE_EXEC) |
601 | { | |
602 | saved_vfork_state = STATE_NONE; | |
603 | ourstatus->kind = TARGET_WAITKIND_EXECD; | |
604 | ourstatus->value.execd_pathname = saved_child_execd_pathname; | |
605 | return inferior_ptid; | |
606 | } | |
607 | ||
47932f85 DJ |
608 | do |
609 | { | |
610 | set_sigint_trap (); /* Causes SIGINT to be passed on to the | |
611 | attached process. */ | |
612 | set_sigio_trap (); | |
613 | ||
614 | pid = ptrace_wait (inferior_ptid, &status); | |
615 | ||
616 | save_errno = errno; | |
617 | ||
618 | clear_sigio_trap (); | |
619 | ||
620 | clear_sigint_trap (); | |
621 | ||
622 | if (pid == -1) | |
623 | { | |
624 | if (save_errno == EINTR) | |
625 | continue; | |
626 | ||
627 | fprintf_unfiltered (gdb_stderr, "Child process unexpectedly missing: %s.\n", | |
628 | safe_strerror (save_errno)); | |
629 | ||
630 | /* Claim it exited with unknown signal. */ | |
631 | ourstatus->kind = TARGET_WAITKIND_SIGNALLED; | |
632 | ourstatus->value.sig = TARGET_SIGNAL_UNKNOWN; | |
633 | return pid_to_ptid (-1); | |
634 | } | |
635 | ||
636 | /* Did it exit? | |
637 | */ | |
638 | if (target_has_exited (pid, status, &exit_status)) | |
639 | { | |
640 | /* ??rehrauer: For now, ignore this. */ | |
641 | continue; | |
642 | } | |
643 | ||
644 | if (!target_thread_alive (pid_to_ptid (pid))) | |
645 | { | |
646 | ourstatus->kind = TARGET_WAITKIND_SPURIOUS; | |
647 | return pid_to_ptid (pid); | |
648 | } | |
649 | ||
8e7d2c16 | 650 | if (hpux_has_forked (pid, &related_pid)) |
47932f85 | 651 | { |
8e7d2c16 DJ |
652 | /* Ignore the parent's fork event. */ |
653 | if (pid == PIDGET (inferior_ptid)) | |
654 | { | |
655 | ourstatus->kind = TARGET_WAITKIND_IGNORE; | |
656 | return inferior_ptid; | |
657 | } | |
658 | ||
659 | /* If this is the child's fork event, report that the | |
660 | process has forked. */ | |
661 | if (related_pid == PIDGET (inferior_ptid)) | |
662 | { | |
663 | ourstatus->kind = TARGET_WAITKIND_FORKED; | |
664 | ourstatus->value.related_pid = pid; | |
665 | return inferior_ptid; | |
666 | } | |
47932f85 DJ |
667 | } |
668 | ||
7d2830a3 | 669 | if (hpux_has_vforked (pid, &related_pid)) |
47932f85 | 670 | { |
7d2830a3 DJ |
671 | if (pid == PIDGET (inferior_ptid)) |
672 | { | |
673 | if (saved_vfork_state == STATE_GOT_CHILD) | |
674 | saved_vfork_state = STATE_GOT_PARENT; | |
675 | else if (saved_vfork_state == STATE_GOT_EXEC) | |
676 | saved_vfork_state = STATE_FAKE_EXEC; | |
677 | else | |
678 | fprintf_unfiltered (gdb_stdout, | |
679 | "hppah: parent vfork: confused\n"); | |
680 | } | |
681 | else if (related_pid == PIDGET (inferior_ptid)) | |
682 | { | |
683 | if (saved_vfork_state == STATE_NONE) | |
684 | saved_vfork_state = STATE_GOT_CHILD; | |
685 | else | |
686 | fprintf_unfiltered (gdb_stdout, | |
687 | "hppah: child vfork: confused\n"); | |
688 | } | |
689 | else | |
690 | fprintf_unfiltered (gdb_stdout, | |
691 | "hppah: unknown vfork: confused\n"); | |
692 | ||
693 | if (saved_vfork_state == STATE_GOT_CHILD) | |
694 | { | |
695 | child_post_startup_inferior (pid_to_ptid (pid)); | |
6604731b DJ |
696 | detach_breakpoints (pid); |
697 | #ifdef SOLIB_REMOVE_INFERIOR_HOOK | |
698 | SOLIB_REMOVE_INFERIOR_HOOK (pid); | |
699 | #endif | |
700 | child_resume (pid_to_ptid (pid), 0, TARGET_SIGNAL_0); | |
701 | ourstatus->kind = TARGET_WAITKIND_IGNORE; | |
702 | return pid_to_ptid (related_pid); | |
7d2830a3 | 703 | } |
6604731b | 704 | else if (saved_vfork_state == STATE_FAKE_EXEC) |
7d2830a3 DJ |
705 | { |
706 | ourstatus->kind = TARGET_WAITKIND_VFORKED; | |
707 | ourstatus->value.related_pid = related_pid; | |
708 | return pid_to_ptid (pid); | |
709 | } | |
6604731b DJ |
710 | else |
711 | { | |
712 | /* We saw the parent's vfork, but we haven't seen the exec yet. | |
713 | Wait for it, for simplicity's sake. It should be pending. */ | |
714 | saved_vfork_pid = related_pid; | |
715 | ourstatus->kind = TARGET_WAITKIND_IGNORE; | |
716 | return pid_to_ptid (pid); | |
717 | } | |
47932f85 DJ |
718 | } |
719 | ||
720 | if (hpux_has_execd (pid, &execd_pathname)) | |
721 | { | |
7d2830a3 DJ |
722 | /* On HP-UX, events associated with a vforking inferior come in |
723 | threes: a vfork event for the child (always first), followed | |
724 | a vfork event for the parent and an exec event for the child. | |
6604731b DJ |
725 | The latter two can come in either order. Make sure we get |
726 | both. */ | |
727 | if (saved_vfork_state != STATE_NONE) | |
7d2830a3 | 728 | { |
6604731b DJ |
729 | if (saved_vfork_state == STATE_GOT_CHILD) |
730 | { | |
731 | saved_vfork_state = STATE_GOT_EXEC; | |
732 | /* On HP/UX with ptrace, the child must be resumed before | |
733 | the parent vfork event is delivered. A single-step | |
734 | suffices. */ | |
735 | if (RESUME_EXECD_VFORKING_CHILD_TO_GET_PARENT_VFORK ()) | |
736 | target_resume (pid_to_ptid (pid), 1, TARGET_SIGNAL_0); | |
737 | ourstatus->kind = TARGET_WAITKIND_IGNORE; | |
738 | } | |
739 | else if (saved_vfork_state == STATE_GOT_PARENT) | |
740 | { | |
741 | saved_vfork_state = STATE_FAKE_EXEC; | |
742 | ourstatus->kind = TARGET_WAITKIND_VFORKED; | |
743 | ourstatus->value.related_pid = saved_vfork_pid; | |
744 | } | |
745 | else | |
746 | fprintf_unfiltered (gdb_stdout, | |
747 | "hppa: exec: unexpected state\n"); | |
7d2830a3 | 748 | |
6604731b | 749 | saved_child_execd_pathname = execd_pathname; |
7d2830a3 | 750 | |
7d2830a3 DJ |
751 | return inferior_ptid; |
752 | } | |
753 | ||
47932f85 DJ |
754 | /* Are we ignoring initial exec events? (This is likely because |
755 | we're in the process of starting up the inferior, and another | |
756 | (older) mechanism handles those.) If so, we'll report this | |
757 | as a regular stop, not an exec. | |
758 | */ | |
759 | if (inferior_ignoring_startup_exec_events) | |
760 | { | |
761 | inferior_ignoring_startup_exec_events--; | |
762 | } | |
763 | else | |
764 | { | |
765 | ourstatus->kind = TARGET_WAITKIND_EXECD; | |
766 | ourstatus->value.execd_pathname = execd_pathname; | |
767 | return pid_to_ptid (pid); | |
768 | } | |
769 | } | |
770 | ||
771 | /* All we must do with these is communicate their occurrence | |
772 | to wait_for_inferior... | |
773 | */ | |
774 | if (hpux_has_syscall_event (pid, &kind, &syscall_id)) | |
775 | { | |
776 | ourstatus->kind = kind; | |
777 | ourstatus->value.syscall_id = syscall_id; | |
778 | return pid_to_ptid (pid); | |
779 | } | |
780 | ||
781 | /*## } while (pid != PIDGET (inferior_ptid)); ## *//* Some other child died or stopped */ | |
782 | /* hack for thread testing */ | |
783 | } | |
784 | while ((pid != PIDGET (inferior_ptid)) && not_same_real_pid); | |
785 | /*## */ | |
786 | ||
787 | store_waitstatus (ourstatus, status); | |
788 | return pid_to_ptid (pid); | |
789 | } | |
790 | ||
c906108c SS |
791 | #if !defined (GDB_NATIVE_HPUX_11) |
792 | ||
793 | /* The following code is a substitute for the infttrace.c versions used | |
794 | with ttrace() in HPUX 11. */ | |
795 | ||
796 | /* This value is an arbitrary integer. */ | |
797 | #define PT_VERSION 123456 | |
798 | ||
799 | /* This semaphore is used to coordinate the child and parent processes | |
800 | after a fork(), and before an exec() by the child. See | |
801 | parent_attach_all for details. */ | |
802 | ||
c5aa993b JM |
803 | typedef struct |
804 | { | |
805 | int parent_channel[2]; /* Parent "talks" to [1], child "listens" to [0] */ | |
806 | int child_channel[2]; /* Child "talks" to [1], parent "listens" to [0] */ | |
807 | } | |
808 | startup_semaphore_t; | |
c906108c SS |
809 | |
810 | #define SEM_TALK (1) | |
811 | #define SEM_LISTEN (0) | |
812 | ||
c5aa993b | 813 | static startup_semaphore_t startup_semaphore; |
c906108c | 814 | |
c906108c SS |
815 | #ifdef PT_SETTRC |
816 | /* This function causes the caller's process to be traced by its | |
817 | parent. This is intended to be called after GDB forks itself, | |
818 | and before the child execs the target. | |
819 | ||
820 | Note that HP-UX ptrace is rather funky in how this is done. | |
821 | If the parent wants to get the initial exec event of a child, | |
822 | it must set the ptrace event mask of the child to include execs. | |
823 | (The child cannot do this itself.) This must be done after the | |
824 | child is forked, but before it execs. | |
825 | ||
826 | To coordinate the parent and child, we implement a semaphore using | |
827 | pipes. After SETTRC'ing itself, the child tells the parent that | |
828 | it is now traceable by the parent, and waits for the parent's | |
829 | acknowledgement. The parent can then set the child's event mask, | |
830 | and notify the child that it can now exec. | |
831 | ||
832 | (The acknowledgement by parent happens as a result of a call to | |
833 | child_acknowledge_created_inferior.) */ | |
834 | ||
835 | int | |
fba45db2 | 836 | parent_attach_all (int pid, PTRACE_ARG3_TYPE addr, int data) |
c906108c SS |
837 | { |
838 | int pt_status = 0; | |
839 | ||
840 | /* We need a memory home for a constant. */ | |
841 | int tc_magic_child = PT_VERSION; | |
842 | int tc_magic_parent = 0; | |
843 | ||
844 | /* The remainder of this function is only useful for HPUX 10.0 and | |
845 | later, as it depends upon the ability to request notification | |
846 | of specific kinds of events by the kernel. */ | |
847 | #if defined(PT_SET_EVENT_MASK) | |
848 | ||
849 | /* Notify the parent that we're potentially ready to exec(). */ | |
850 | write (startup_semaphore.child_channel[SEM_TALK], | |
b83266a0 SS |
851 | &tc_magic_child, |
852 | sizeof (tc_magic_child)); | |
c906108c SS |
853 | |
854 | /* Wait for acknowledgement from the parent. */ | |
855 | read (startup_semaphore.parent_channel[SEM_LISTEN], | |
b83266a0 SS |
856 | &tc_magic_parent, |
857 | sizeof (tc_magic_parent)); | |
c906108c | 858 | if (tc_magic_child != tc_magic_parent) |
c5aa993b | 859 | warning ("mismatched semaphore magic"); |
c906108c SS |
860 | |
861 | /* Discard our copy of the semaphore. */ | |
862 | (void) close (startup_semaphore.parent_channel[SEM_LISTEN]); | |
863 | (void) close (startup_semaphore.parent_channel[SEM_TALK]); | |
864 | (void) close (startup_semaphore.child_channel[SEM_LISTEN]); | |
865 | (void) close (startup_semaphore.child_channel[SEM_TALK]); | |
866 | #endif | |
c5aa993b | 867 | |
c906108c SS |
868 | return 0; |
869 | } | |
870 | #endif | |
871 | ||
872 | int | |
fba45db2 | 873 | hppa_require_attach (int pid) |
c906108c SS |
874 | { |
875 | int pt_status; | |
b83266a0 SS |
876 | CORE_ADDR pc; |
877 | CORE_ADDR pc_addr; | |
c906108c SS |
878 | unsigned int regs_offset; |
879 | ||
880 | /* Are we already attached? There appears to be no explicit way to | |
881 | answer this via ptrace, so we try something which should be | |
882 | innocuous if we are attached. If that fails, then we assume | |
883 | we're not attached, and so attempt to make it so. */ | |
884 | ||
885 | errno = 0; | |
886 | regs_offset = U_REGS_OFFSET; | |
887 | pc_addr = register_addr (PC_REGNUM, regs_offset); | |
888 | pc = call_ptrace (PT_READ_U, pid, (PTRACE_ARG3_TYPE) pc_addr, 0); | |
889 | ||
890 | if (errno) | |
891 | { | |
892 | errno = 0; | |
893 | pt_status = call_ptrace (PT_ATTACH, pid, (PTRACE_ARG3_TYPE) 0, 0); | |
894 | ||
895 | if (errno) | |
b83266a0 | 896 | return -1; |
c906108c SS |
897 | |
898 | /* Now we really are attached. */ | |
899 | errno = 0; | |
900 | } | |
901 | attach_flag = 1; | |
902 | return pid; | |
903 | } | |
904 | ||
905 | int | |
fba45db2 | 906 | hppa_require_detach (int pid, int signal) |
c906108c SS |
907 | { |
908 | errno = 0; | |
909 | call_ptrace (PT_DETACH, pid, (PTRACE_ARG3_TYPE) 1, signal); | |
c5aa993b | 910 | errno = 0; /* Ignore any errors. */ |
c906108c SS |
911 | return pid; |
912 | } | |
913 | ||
914 | /* Since ptrace doesn't support memory page-protection events, which | |
915 | are used to implement "hardware" watchpoints on HP-UX, these are | |
916 | dummy versions, which perform no useful work. */ | |
917 | ||
918 | void | |
fba45db2 | 919 | hppa_enable_page_protection_events (int pid) |
c906108c SS |
920 | { |
921 | } | |
922 | ||
923 | void | |
fba45db2 | 924 | hppa_disable_page_protection_events (int pid) |
c906108c SS |
925 | { |
926 | } | |
927 | ||
928 | int | |
fba45db2 | 929 | hppa_insert_hw_watchpoint (int pid, CORE_ADDR start, LONGEST len, int type) |
c906108c SS |
930 | { |
931 | error ("Hardware watchpoints not implemented on this platform."); | |
932 | } | |
933 | ||
934 | int | |
65e82032 | 935 | hppa_remove_hw_watchpoint (int pid, CORE_ADDR start, LONGEST len, int type) |
c906108c SS |
936 | { |
937 | error ("Hardware watchpoints not implemented on this platform."); | |
938 | } | |
939 | ||
940 | int | |
65e82032 | 941 | hppa_can_use_hw_watchpoint (int type, int cnt, int ot) |
c906108c SS |
942 | { |
943 | return 0; | |
944 | } | |
945 | ||
946 | int | |
fba45db2 | 947 | hppa_range_profitable_for_hw_watchpoint (int pid, CORE_ADDR start, LONGEST len) |
c906108c SS |
948 | { |
949 | error ("Hardware watchpoints not implemented on this platform."); | |
950 | } | |
951 | ||
952 | char * | |
39f77062 | 953 | hppa_pid_or_tid_to_str (ptid_t id) |
c906108c SS |
954 | { |
955 | /* In the ptrace world, there are only processes. */ | |
ed9a39eb | 956 | return child_pid_to_str (id); |
c906108c SS |
957 | } |
958 | ||
c906108c | 959 | void |
fba45db2 | 960 | hppa_ensure_vforking_parent_remains_stopped (int pid) |
c906108c SS |
961 | { |
962 | /* This assumes that the vforked parent is presently stopped, and | |
963 | that the vforked child has just delivered its first exec event. | |
964 | Calling kill() this way will cause the SIGTRAP to be delivered as | |
965 | soon as the parent is resumed, which happens as soon as the | |
966 | vforked child is resumed. See wait_for_inferior for the use of | |
967 | this function. */ | |
968 | kill (pid, SIGTRAP); | |
969 | } | |
970 | ||
971 | int | |
fba45db2 | 972 | hppa_resume_execd_vforking_child_to_get_parent_vfork (void) |
c906108c | 973 | { |
c5aa993b | 974 | return 1; /* Yes, the child must be resumed. */ |
c906108c SS |
975 | } |
976 | ||
977 | void | |
fba45db2 | 978 | require_notification_of_events (int pid) |
c906108c SS |
979 | { |
980 | #if defined(PT_SET_EVENT_MASK) | |
981 | int pt_status; | |
982 | ptrace_event_t ptrace_events; | |
c2d11a7d JM |
983 | int nsigs; |
984 | int signum; | |
c906108c SS |
985 | |
986 | /* Instruct the kernel as to the set of events we wish to be | |
987 | informed of. (This support does not exist before HPUX 10.0. | |
988 | We'll assume if PT_SET_EVENT_MASK has not been defined by | |
b83266a0 | 989 | <sys/ptrace.h>, then we're being built on pre-10.0.) */ |
c906108c SS |
990 | memset (&ptrace_events, 0, sizeof (ptrace_events)); |
991 | ||
992 | /* Note: By default, all signals are visible to us. If we wish | |
993 | the kernel to keep certain signals hidden from us, we do it | |
994 | by calling sigdelset (ptrace_events.pe_signals, signal) for | |
b83266a0 | 995 | each such signal here, before doing PT_SET_EVENT_MASK. */ |
c2d11a7d JM |
996 | /* RM: The above comment is no longer true. We start with ignoring |
997 | all signals, and then add the ones we are interested in. We could | |
998 | do it the other way: start by looking at all signals and then | |
999 | deleting the ones that we aren't interested in, except that | |
1000 | multiple gdb signals may be mapped to the same host signal | |
1001 | (eg. TARGET_SIGNAL_IO and TARGET_SIGNAL_POLL both get mapped to | |
1002 | signal 22 on HPUX 10.20) We want to be notified if we are | |
1003 | interested in either signal. */ | |
1004 | sigfillset (&ptrace_events.pe_signals); | |
1005 | ||
1006 | /* RM: Let's not bother with signals we don't care about */ | |
1007 | nsigs = (int) TARGET_SIGNAL_LAST; | |
1008 | for (signum = nsigs; signum > 0; signum--) | |
1009 | { | |
1010 | if ((signal_stop_state (signum)) || | |
1011 | (signal_print_state (signum)) || | |
1012 | (!signal_pass_state (signum))) | |
1013 | { | |
1014 | if (target_signal_to_host_p (signum)) | |
1015 | sigdelset (&ptrace_events.pe_signals, | |
1016 | target_signal_to_host (signum)); | |
1017 | } | |
1018 | } | |
c906108c SS |
1019 | |
1020 | ptrace_events.pe_set_event = 0; | |
1021 | ||
1022 | ptrace_events.pe_set_event |= PTRACE_SIGNAL; | |
1023 | ptrace_events.pe_set_event |= PTRACE_EXEC; | |
1024 | ptrace_events.pe_set_event |= PTRACE_FORK; | |
1025 | ptrace_events.pe_set_event |= PTRACE_VFORK; | |
1026 | /* ??rehrauer: Add this one when we're prepared to catch it... | |
c5aa993b JM |
1027 | ptrace_events.pe_set_event |= PTRACE_EXIT; |
1028 | */ | |
c906108c SS |
1029 | |
1030 | errno = 0; | |
1031 | pt_status = call_ptrace (PT_SET_EVENT_MASK, | |
c5aa993b JM |
1032 | pid, |
1033 | (PTRACE_ARG3_TYPE) & ptrace_events, | |
1034 | sizeof (ptrace_events)); | |
c906108c SS |
1035 | if (errno) |
1036 | perror_with_name ("ptrace"); | |
1037 | if (pt_status < 0) | |
1038 | return; | |
1039 | #endif | |
1040 | } | |
1041 | ||
1042 | void | |
fba45db2 | 1043 | require_notification_of_exec_events (int pid) |
c906108c SS |
1044 | { |
1045 | #if defined(PT_SET_EVENT_MASK) | |
1046 | int pt_status; | |
1047 | ptrace_event_t ptrace_events; | |
1048 | ||
1049 | /* Instruct the kernel as to the set of events we wish to be | |
1050 | informed of. (This support does not exist before HPUX 10.0. | |
1051 | We'll assume if PT_SET_EVENT_MASK has not been defined by | |
b83266a0 | 1052 | <sys/ptrace.h>, then we're being built on pre-10.0.) */ |
c906108c SS |
1053 | memset (&ptrace_events, 0, sizeof (ptrace_events)); |
1054 | ||
1055 | /* Note: By default, all signals are visible to us. If we wish | |
1056 | the kernel to keep certain signals hidden from us, we do it | |
1057 | by calling sigdelset (ptrace_events.pe_signals, signal) for | |
b83266a0 | 1058 | each such signal here, before doing PT_SET_EVENT_MASK. */ |
c906108c SS |
1059 | sigemptyset (&ptrace_events.pe_signals); |
1060 | ||
1061 | ptrace_events.pe_set_event = 0; | |
1062 | ||
1063 | ptrace_events.pe_set_event |= PTRACE_EXEC; | |
1064 | /* ??rehrauer: Add this one when we're prepared to catch it... | |
c5aa993b JM |
1065 | ptrace_events.pe_set_event |= PTRACE_EXIT; |
1066 | */ | |
c906108c SS |
1067 | |
1068 | errno = 0; | |
1069 | pt_status = call_ptrace (PT_SET_EVENT_MASK, | |
c5aa993b JM |
1070 | pid, |
1071 | (PTRACE_ARG3_TYPE) & ptrace_events, | |
1072 | sizeof (ptrace_events)); | |
c906108c SS |
1073 | if (errno) |
1074 | perror_with_name ("ptrace"); | |
1075 | if (pt_status < 0) | |
1076 | return; | |
1077 | #endif | |
1078 | } | |
1079 | ||
1080 | /* This function is called by the parent process, with pid being the | |
1081 | ID of the child process, after the debugger has forked. */ | |
1082 | ||
1083 | void | |
fba45db2 | 1084 | child_acknowledge_created_inferior (int pid) |
c906108c SS |
1085 | { |
1086 | /* We need a memory home for a constant. */ | |
1087 | int tc_magic_parent = PT_VERSION; | |
1088 | int tc_magic_child = 0; | |
1089 | ||
b83266a0 SS |
1090 | /* The remainder of this function is only useful for HPUX 10.0 and |
1091 | later, as it depends upon the ability to request notification | |
1092 | of specific kinds of events by the kernel. */ | |
1093 | #if defined(PT_SET_EVENT_MASK) | |
c906108c SS |
1094 | /* Wait for the child to tell us that it has forked. */ |
1095 | read (startup_semaphore.child_channel[SEM_LISTEN], | |
b83266a0 | 1096 | &tc_magic_child, |
c5aa993b | 1097 | sizeof (tc_magic_child)); |
c906108c SS |
1098 | |
1099 | /* Notify the child that it can exec. | |
1100 | ||
1101 | In the infttrace.c variant of this function, we set the child's | |
1102 | event mask after the fork but before the exec. In the ptrace | |
1103 | world, it seems we can't set the event mask until after the exec. */ | |
c906108c | 1104 | write (startup_semaphore.parent_channel[SEM_TALK], |
b83266a0 SS |
1105 | &tc_magic_parent, |
1106 | sizeof (tc_magic_parent)); | |
c906108c SS |
1107 | |
1108 | /* We'd better pause a bit before trying to set the event mask, | |
1109 | though, to ensure that the exec has happened. We don't want to | |
1110 | wait() on the child, because that'll screw up the upper layers | |
1111 | of gdb's execution control that expect to see the exec event. | |
1112 | ||
1113 | After an exec, the child is no longer executing gdb code. Hence, | |
1114 | we can't have yet another synchronization via the pipes. We'll | |
1115 | just sleep for a second, and hope that's enough delay... */ | |
c906108c SS |
1116 | sleep (1); |
1117 | ||
1118 | /* Instruct the kernel as to the set of events we wish to be | |
1119 | informed of. */ | |
c906108c SS |
1120 | require_notification_of_exec_events (pid); |
1121 | ||
1122 | /* Discard our copy of the semaphore. */ | |
1123 | (void) close (startup_semaphore.parent_channel[SEM_LISTEN]); | |
1124 | (void) close (startup_semaphore.parent_channel[SEM_TALK]); | |
1125 | (void) close (startup_semaphore.child_channel[SEM_LISTEN]); | |
1126 | (void) close (startup_semaphore.child_channel[SEM_TALK]); | |
b83266a0 | 1127 | #endif |
c906108c SS |
1128 | } |
1129 | ||
1130 | void | |
39f77062 | 1131 | child_post_startup_inferior (ptid_t ptid) |
c906108c | 1132 | { |
39f77062 | 1133 | require_notification_of_events (PIDGET (ptid)); |
c906108c SS |
1134 | } |
1135 | ||
1136 | void | |
fba45db2 | 1137 | child_post_attach (int pid) |
c906108c SS |
1138 | { |
1139 | require_notification_of_events (pid); | |
1140 | } | |
1141 | ||
1142 | int | |
fba45db2 | 1143 | child_insert_fork_catchpoint (int pid) |
c906108c SS |
1144 | { |
1145 | /* This request is only available on HPUX 10.0 and later. */ | |
1146 | #if !defined(PT_SET_EVENT_MASK) | |
1147 | error ("Unable to catch forks prior to HPUX 10.0"); | |
1148 | #else | |
1149 | /* Enable reporting of fork events from the kernel. */ | |
1150 | /* ??rehrauer: For the moment, we're always enabling these events, | |
b83266a0 | 1151 | and just ignoring them if there's no catchpoint to catch them. */ |
c906108c SS |
1152 | return 0; |
1153 | #endif | |
1154 | } | |
1155 | ||
1156 | int | |
fba45db2 | 1157 | child_remove_fork_catchpoint (int pid) |
c906108c SS |
1158 | { |
1159 | /* This request is only available on HPUX 10.0 and later. */ | |
1160 | #if !defined(PT_SET_EVENT_MASK) | |
1161 | error ("Unable to catch forks prior to HPUX 10.0"); | |
1162 | #else | |
1163 | /* Disable reporting of fork events from the kernel. */ | |
1164 | /* ??rehrauer: For the moment, we're always enabling these events, | |
1165 | and just ignoring them if there's no catchpoint to catch them. */ | |
1166 | return 0; | |
1167 | #endif | |
1168 | } | |
1169 | ||
1170 | int | |
fba45db2 | 1171 | child_insert_vfork_catchpoint (int pid) |
c906108c SS |
1172 | { |
1173 | /* This request is only available on HPUX 10.0 and later. */ | |
1174 | #if !defined(PT_SET_EVENT_MASK) | |
1175 | error ("Unable to catch vforks prior to HPUX 10.0"); | |
1176 | #else | |
1177 | /* Enable reporting of vfork events from the kernel. */ | |
1178 | /* ??rehrauer: For the moment, we're always enabling these events, | |
1179 | and just ignoring them if there's no catchpoint to catch them. */ | |
1180 | return 0; | |
1181 | #endif | |
1182 | } | |
1183 | ||
1184 | int | |
fba45db2 | 1185 | child_remove_vfork_catchpoint (int pid) |
c906108c SS |
1186 | { |
1187 | /* This request is only available on HPUX 10.0 and later. */ | |
1188 | #if !defined(PT_SET_EVENT_MASK) | |
1189 | error ("Unable to catch vforks prior to HPUX 10.0"); | |
1190 | #else | |
1191 | /* Disable reporting of vfork events from the kernel. */ | |
1192 | /* ??rehrauer: For the moment, we're always enabling these events, | |
1193 | and just ignoring them if there's no catchpoint to catch them. */ | |
1194 | return 0; | |
1195 | #endif | |
1196 | } | |
1197 | ||
1198 | int | |
47932f85 | 1199 | hpux_has_forked (int pid, int *childpid) |
c906108c SS |
1200 | { |
1201 | /* This request is only available on HPUX 10.0 and later. */ | |
1202 | #if !defined(PT_GET_PROCESS_STATE) | |
1203 | *childpid = 0; | |
1204 | return 0; | |
1205 | #else | |
1206 | int pt_status; | |
c5aa993b | 1207 | ptrace_state_t ptrace_state; |
c906108c SS |
1208 | |
1209 | errno = 0; | |
1210 | pt_status = call_ptrace (PT_GET_PROCESS_STATE, | |
b83266a0 | 1211 | pid, |
c5aa993b | 1212 | (PTRACE_ARG3_TYPE) & ptrace_state, |
b83266a0 | 1213 | sizeof (ptrace_state)); |
c906108c SS |
1214 | if (errno) |
1215 | perror_with_name ("ptrace"); | |
1216 | if (pt_status < 0) | |
1217 | return 0; | |
1218 | ||
1219 | if (ptrace_state.pe_report_event & PTRACE_FORK) | |
1220 | { | |
1221 | *childpid = ptrace_state.pe_other_pid; | |
1222 | return 1; | |
1223 | } | |
1224 | ||
1225 | return 0; | |
1226 | #endif | |
1227 | } | |
1228 | ||
1229 | int | |
47932f85 | 1230 | hpux_has_vforked (int pid, int *childpid) |
c906108c SS |
1231 | { |
1232 | /* This request is only available on HPUX 10.0 and later. */ | |
1233 | #if !defined(PT_GET_PROCESS_STATE) | |
1234 | *childpid = 0; | |
1235 | return 0; | |
1236 | ||
1237 | #else | |
1238 | int pt_status; | |
c5aa993b | 1239 | ptrace_state_t ptrace_state; |
c906108c SS |
1240 | |
1241 | errno = 0; | |
1242 | pt_status = call_ptrace (PT_GET_PROCESS_STATE, | |
b83266a0 | 1243 | pid, |
c5aa993b | 1244 | (PTRACE_ARG3_TYPE) & ptrace_state, |
b83266a0 | 1245 | sizeof (ptrace_state)); |
c906108c SS |
1246 | if (errno) |
1247 | perror_with_name ("ptrace"); | |
1248 | if (pt_status < 0) | |
1249 | return 0; | |
1250 | ||
1251 | if (ptrace_state.pe_report_event & PTRACE_VFORK) | |
1252 | { | |
1253 | *childpid = ptrace_state.pe_other_pid; | |
1254 | return 1; | |
1255 | } | |
1256 | ||
1257 | return 0; | |
1258 | #endif | |
1259 | } | |
1260 | ||
c906108c | 1261 | int |
fba45db2 | 1262 | child_insert_exec_catchpoint (int pid) |
c906108c | 1263 | { |
b83266a0 | 1264 | /* This request is only available on HPUX 10.0 and later. */ |
c906108c SS |
1265 | #if !defined(PT_SET_EVENT_MASK) |
1266 | error ("Unable to catch execs prior to HPUX 10.0"); | |
1267 | ||
1268 | #else | |
b83266a0 | 1269 | /* Enable reporting of exec events from the kernel. */ |
c906108c | 1270 | /* ??rehrauer: For the moment, we're always enabling these events, |
b83266a0 | 1271 | and just ignoring them if there's no catchpoint to catch them. */ |
c906108c SS |
1272 | return 0; |
1273 | #endif | |
1274 | } | |
1275 | ||
1276 | int | |
fba45db2 | 1277 | child_remove_exec_catchpoint (int pid) |
c906108c | 1278 | { |
b83266a0 | 1279 | /* This request is only available on HPUX 10.0 and later. */ |
c906108c SS |
1280 | #if !defined(PT_SET_EVENT_MASK) |
1281 | error ("Unable to catch execs prior to HPUX 10.0"); | |
1282 | ||
1283 | #else | |
1284 | /* Disable reporting of exec events from the kernel. */ | |
1285 | /* ??rehrauer: For the moment, we're always enabling these events, | |
b83266a0 | 1286 | and just ignoring them if there's no catchpoint to catch them. */ |
c906108c SS |
1287 | return 0; |
1288 | #endif | |
1289 | } | |
1290 | ||
1291 | int | |
47932f85 | 1292 | hpux_has_execd (int pid, char **execd_pathname) |
c906108c | 1293 | { |
b83266a0 | 1294 | /* This request is only available on HPUX 10.0 and later. */ |
c906108c SS |
1295 | #if !defined(PT_GET_PROCESS_STATE) |
1296 | *execd_pathname = NULL; | |
1297 | return 0; | |
1298 | ||
1299 | #else | |
1300 | int pt_status; | |
c5aa993b | 1301 | ptrace_state_t ptrace_state; |
c906108c SS |
1302 | |
1303 | errno = 0; | |
1304 | pt_status = call_ptrace (PT_GET_PROCESS_STATE, | |
b83266a0 | 1305 | pid, |
c5aa993b | 1306 | (PTRACE_ARG3_TYPE) & ptrace_state, |
b83266a0 | 1307 | sizeof (ptrace_state)); |
c906108c SS |
1308 | if (errno) |
1309 | perror_with_name ("ptrace"); | |
1310 | if (pt_status < 0) | |
1311 | return 0; | |
1312 | ||
1313 | if (ptrace_state.pe_report_event & PTRACE_EXEC) | |
1314 | { | |
c5aa993b | 1315 | char *exec_file = target_pid_to_exec_file (pid); |
c906108c SS |
1316 | *execd_pathname = savestring (exec_file, strlen (exec_file)); |
1317 | return 1; | |
1318 | } | |
1319 | ||
1320 | return 0; | |
1321 | #endif | |
1322 | } | |
1323 | ||
1324 | int | |
fba45db2 | 1325 | child_reported_exec_events_per_exec_call (void) |
c906108c | 1326 | { |
c5aa993b | 1327 | return 2; /* ptrace reports the event twice per call. */ |
c906108c SS |
1328 | } |
1329 | ||
1330 | int | |
47932f85 | 1331 | hpux_has_syscall_event (int pid, enum target_waitkind *kind, int *syscall_id) |
c906108c SS |
1332 | { |
1333 | /* This request is only available on HPUX 10.30 and later, via | |
1334 | the ttrace interface. */ | |
1335 | ||
1336 | *kind = TARGET_WAITKIND_SPURIOUS; | |
1337 | *syscall_id = -1; | |
1338 | return 0; | |
1339 | } | |
1340 | ||
1341 | char * | |
fba45db2 | 1342 | child_pid_to_exec_file (int pid) |
c906108c | 1343 | { |
b83266a0 | 1344 | static char exec_file_buffer[1024]; |
c906108c | 1345 | int pt_status; |
b83266a0 SS |
1346 | CORE_ADDR top_of_stack; |
1347 | char four_chars[4]; | |
c906108c SS |
1348 | int name_index; |
1349 | int i; | |
39f77062 | 1350 | ptid_t saved_inferior_ptid; |
52287340 | 1351 | int done; |
c5aa993b | 1352 | |
c906108c SS |
1353 | #ifdef PT_GET_PROCESS_PATHNAME |
1354 | /* As of 10.x HP-UX, there's an explicit request to get the pathname. */ | |
1355 | pt_status = call_ptrace (PT_GET_PROCESS_PATHNAME, | |
b83266a0 SS |
1356 | pid, |
1357 | (PTRACE_ARG3_TYPE) exec_file_buffer, | |
1358 | sizeof (exec_file_buffer) - 1); | |
c906108c SS |
1359 | if (pt_status == 0) |
1360 | return exec_file_buffer; | |
1361 | #endif | |
1362 | ||
1363 | /* It appears that this request is broken prior to 10.30. | |
1364 | If it fails, try a really, truly amazingly gross hack | |
1365 | that DDE uses, of pawing through the process' data | |
1366 | segment to find the pathname. */ | |
1367 | ||
1368 | top_of_stack = 0x7b03a000; | |
1369 | name_index = 0; | |
1370 | done = 0; | |
1371 | ||
39f77062 KB |
1372 | /* On the chance that pid != inferior_ptid, set inferior_ptid |
1373 | to pid, so that (grrrr!) implicit uses of inferior_ptid get | |
c906108c SS |
1374 | the right id. */ |
1375 | ||
39f77062 KB |
1376 | saved_inferior_ptid = inferior_ptid; |
1377 | inferior_ptid = pid_to_ptid (pid); | |
c906108c SS |
1378 | |
1379 | /* Try to grab a null-terminated string. */ | |
c5aa993b | 1380 | while (!done) |
c906108c SS |
1381 | { |
1382 | if (target_read_memory (top_of_stack, four_chars, 4) != 0) | |
1383 | { | |
39f77062 | 1384 | inferior_ptid = saved_inferior_ptid; |
c906108c SS |
1385 | return NULL; |
1386 | } | |
1387 | for (i = 0; i < 4; i++) | |
1388 | { | |
1389 | exec_file_buffer[name_index++] = four_chars[i]; | |
1390 | done = (four_chars[i] == '\0'); | |
1391 | if (done) | |
1392 | break; | |
1393 | } | |
1394 | top_of_stack += 4; | |
1395 | } | |
1396 | ||
1397 | if (exec_file_buffer[0] == '\0') | |
1398 | { | |
39f77062 | 1399 | inferior_ptid = saved_inferior_ptid; |
c906108c SS |
1400 | return NULL; |
1401 | } | |
1402 | ||
39f77062 | 1403 | inferior_ptid = saved_inferior_ptid; |
c906108c SS |
1404 | return exec_file_buffer; |
1405 | } | |
1406 | ||
1407 | void | |
fba45db2 | 1408 | pre_fork_inferior (void) |
c906108c SS |
1409 | { |
1410 | int status; | |
1411 | ||
1412 | status = pipe (startup_semaphore.parent_channel); | |
1413 | if (status < 0) | |
1414 | { | |
1415 | warning ("error getting parent pipe for startup semaphore"); | |
1416 | return; | |
1417 | } | |
1418 | ||
1419 | status = pipe (startup_semaphore.child_channel); | |
1420 | if (status < 0) | |
1421 | { | |
1422 | warning ("error getting child pipe for startup semaphore"); | |
1423 | return; | |
1424 | } | |
1425 | } | |
c906108c | 1426 | \f |
c5aa993b | 1427 | |
c906108c SS |
1428 | /* Check to see if the given thread is alive. |
1429 | ||
1430 | This is a no-op, as ptrace doesn't support threads, so we just | |
1431 | return "TRUE". */ | |
1432 | ||
1433 | int | |
39f77062 | 1434 | child_thread_alive (ptid_t ptid) |
c906108c | 1435 | { |
c5aa993b | 1436 | return 1; |
c906108c SS |
1437 | } |
1438 | ||
1439 | #endif /* ! GDB_NATIVE_HPUX_11 */ |