Commit | Line | Data |
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c906108c | 1 | /* Native support code for HPUX PA-RISC. |
b6ba6518 KB |
2 | Copyright 1986, 1987, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, |
3 | 1998, 1999, 2000, 2001 | |
c906108c SS |
4 | Free Software Foundation, Inc. |
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" |
c906108c SS |
35 | #include <signal.h> |
36 | ||
47932f85 DJ |
37 | extern int hpux_has_forked (int pid, int *childpid); |
38 | extern int hpux_has_vforked (int pid, int *childpid); | |
39 | extern int hpux_has_execd (int pid, char **execd_pathname); | |
40 | extern int hpux_has_syscall_event (int pid, enum target_waitkind *kind, | |
41 | int *syscall_id); | |
42 | ||
b9fbf434 AC |
43 | static CORE_ADDR text_end; |
44 | ||
45 | void | |
46 | deprecated_hpux_text_end (struct target_ops *exec_ops) | |
47 | { | |
48 | struct section_table *p; | |
49 | ||
50 | /* Set text_end to the highest address of the end of any readonly | |
51 | code section. */ | |
52 | /* FIXME: The comment above does not match the code. The code | |
53 | checks for sections with are either code *or* readonly. */ | |
54 | text_end = (CORE_ADDR) 0; | |
55 | for (p = exec_ops->to_sections; p < exec_ops->to_sections_end; p++) | |
56 | if (bfd_get_section_flags (p->bfd, p->the_bfd_section) | |
57 | & (SEC_CODE | SEC_READONLY)) | |
58 | { | |
59 | if (text_end < p->endaddr) | |
60 | text_end = p->endaddr; | |
61 | } | |
62 | } | |
63 | ||
64 | ||
a14ed312 | 65 | static void fetch_register (int); |
c906108c SS |
66 | |
67 | void | |
fba45db2 | 68 | fetch_inferior_registers (int regno) |
c906108c SS |
69 | { |
70 | if (regno == -1) | |
71 | for (regno = 0; regno < NUM_REGS; regno++) | |
72 | fetch_register (regno); | |
73 | else | |
74 | fetch_register (regno); | |
75 | } | |
76 | ||
7be570e7 JM |
77 | /* Our own version of the offsetof macro, since we can't assume ANSI C. */ |
78 | #define HPPAH_OFFSETOF(type, member) ((int) (&((type *) 0)->member)) | |
79 | ||
c906108c SS |
80 | /* Store our register values back into the inferior. |
81 | If REGNO is -1, do this for all registers. | |
82 | Otherwise, REGNO specifies which register (so we can save time). */ | |
83 | ||
84 | void | |
fba45db2 | 85 | store_inferior_registers (int regno) |
c906108c | 86 | { |
52f0bd74 | 87 | unsigned int regaddr; |
c906108c | 88 | char buf[80]; |
52f0bd74 | 89 | int i; |
c906108c SS |
90 | unsigned int offset = U_REGS_OFFSET; |
91 | int scratch; | |
92 | ||
93 | if (regno >= 0) | |
94 | { | |
7be570e7 JM |
95 | unsigned int addr, len, offset; |
96 | ||
c906108c SS |
97 | if (CANNOT_STORE_REGISTER (regno)) |
98 | return; | |
7be570e7 JM |
99 | |
100 | offset = 0; | |
101 | len = REGISTER_RAW_SIZE (regno); | |
102 | ||
103 | /* Requests for register zero actually want the save_state's | |
104 | ss_flags member. As RM says: "Oh, what a hack!" */ | |
105 | if (regno == 0) | |
b83266a0 | 106 | { |
7be570e7 JM |
107 | save_state_t ss; |
108 | addr = HPPAH_OFFSETOF (save_state_t, ss_flags); | |
109 | len = sizeof (ss.ss_flags); | |
110 | ||
111 | /* Note that ss_flags is always an int, no matter what | |
112 | REGISTER_RAW_SIZE(0) says. Assuming all HP-UX PA machines | |
113 | are big-endian, put it at the least significant end of the | |
114 | value, and zap the rest of the buffer. */ | |
115 | offset = REGISTER_RAW_SIZE (0) - len; | |
116 | } | |
117 | ||
118 | /* Floating-point registers come from the ss_fpblock area. */ | |
119 | else if (regno >= FP0_REGNUM) | |
120 | addr = (HPPAH_OFFSETOF (save_state_t, ss_fpblock) | |
62700349 | 121 | + (DEPRECATED_REGISTER_BYTE (regno) - DEPRECATED_REGISTER_BYTE (FP0_REGNUM))); |
7be570e7 JM |
122 | |
123 | /* Wide registers come from the ss_wide area. | |
124 | I think it's more PC to test (ss_flags & SS_WIDEREGS) to select | |
125 | between ss_wide and ss_narrow than to use the raw register size. | |
126 | But checking ss_flags would require an extra ptrace call for | |
127 | every register reference. Bleah. */ | |
128 | else if (len == 8) | |
129 | addr = (HPPAH_OFFSETOF (save_state_t, ss_wide) | |
62700349 | 130 | + DEPRECATED_REGISTER_BYTE (regno)); |
7be570e7 JM |
131 | |
132 | /* Narrow registers come from the ss_narrow area. Note that | |
133 | ss_narrow starts with gr1, not gr0. */ | |
134 | else if (len == 4) | |
135 | addr = (HPPAH_OFFSETOF (save_state_t, ss_narrow) | |
62700349 | 136 | + (DEPRECATED_REGISTER_BYTE (regno) - DEPRECATED_REGISTER_BYTE (1))); |
7be570e7 | 137 | else |
8e65ff28 AC |
138 | internal_error (__FILE__, __LINE__, |
139 | "hppah-nat.c (write_register): unexpected register size"); | |
7be570e7 JM |
140 | |
141 | #ifdef GDB_TARGET_IS_HPPA_20W | |
142 | /* Unbelieveable. The PC head and tail must be written in 64bit hunks | |
143 | or we will get an error. Worse yet, the oddball ptrace/ttrace | |
144 | layering will not allow us to perform a 64bit register store. | |
145 | ||
146 | What a crock. */ | |
147 | if (regno == PCOQ_HEAD_REGNUM || regno == PCOQ_TAIL_REGNUM && len == 8) | |
148 | { | |
149 | CORE_ADDR temp; | |
150 | ||
62700349 | 151 | temp = *(CORE_ADDR *)&deprecated_registers[DEPRECATED_REGISTER_BYTE (regno)]; |
7be570e7 JM |
152 | |
153 | /* Set the priv level (stored in the low two bits of the PC. */ | |
154 | temp |= 0x3; | |
155 | ||
39f77062 KB |
156 | ttrace_write_reg_64 (PIDGET (inferior_ptid), (CORE_ADDR)addr, |
157 | (CORE_ADDR)&temp); | |
7be570e7 JM |
158 | |
159 | /* If we fail to write the PC, give a true error instead of | |
160 | just a warning. */ | |
b83266a0 SS |
161 | if (errno != 0) |
162 | { | |
7be570e7 JM |
163 | char *err = safe_strerror (errno); |
164 | char *msg = alloca (strlen (err) + 128); | |
165 | sprintf (msg, "writing `%s' register: %s", | |
166 | REGISTER_NAME (regno), err); | |
167 | perror_with_name (msg); | |
b83266a0 | 168 | } |
7be570e7 | 169 | return; |
b83266a0 | 170 | } |
53a5351d JM |
171 | |
172 | /* Another crock. HPUX complains if you write a nonzero value to | |
173 | the high part of IPSW. What will it take for HP to catch a | |
174 | clue about building sensible interfaces? */ | |
175 | if (regno == IPSW_REGNUM && len == 8) | |
62700349 | 176 | *(int *)&deprecated_registers[DEPRECATED_REGISTER_BYTE (regno)] = 0; |
7be570e7 JM |
177 | #endif |
178 | ||
179 | for (i = 0; i < len; i += sizeof (int)) | |
180 | { | |
181 | errno = 0; | |
39f77062 KB |
182 | call_ptrace (PT_WUREGS, PIDGET (inferior_ptid), |
183 | (PTRACE_ARG3_TYPE) addr + i, | |
62700349 | 184 | *(int *) &deprecated_registers[DEPRECATED_REGISTER_BYTE (regno) + i]); |
7be570e7 JM |
185 | if (errno != 0) |
186 | { | |
187 | /* Warning, not error, in case we are attached; sometimes | |
188 | the kernel doesn't let us at the registers. */ | |
189 | char *err = safe_strerror (errno); | |
190 | char *msg = alloca (strlen (err) + 128); | |
53a5351d | 191 | sprintf (msg, "writing `%s' register: %s", |
7be570e7 JM |
192 | REGISTER_NAME (regno), err); |
193 | /* If we fail to write the PC, give a true error instead of | |
194 | just a warning. */ | |
195 | if (regno == PCOQ_HEAD_REGNUM || regno == PCOQ_TAIL_REGNUM) | |
196 | perror_with_name (msg); | |
197 | else | |
c906108c | 198 | warning (msg); |
7be570e7 JM |
199 | return; |
200 | } | |
201 | } | |
c906108c SS |
202 | } |
203 | else | |
204 | for (regno = 0; regno < NUM_REGS; regno++) | |
205 | store_inferior_registers (regno); | |
206 | } | |
207 | ||
c906108c | 208 | |
adf40b2e | 209 | /* Fetch a register's value from the process's U area. */ |
c906108c | 210 | static void |
fba45db2 | 211 | fetch_register (int regno) |
c906108c | 212 | { |
123a958e | 213 | char buf[MAX_REGISTER_SIZE]; |
adf40b2e JM |
214 | unsigned int addr, len, offset; |
215 | int i; | |
c906108c | 216 | |
adf40b2e JM |
217 | offset = 0; |
218 | len = REGISTER_RAW_SIZE (regno); | |
219 | ||
220 | /* Requests for register zero actually want the save_state's | |
221 | ss_flags member. As RM says: "Oh, what a hack!" */ | |
222 | if (regno == 0) | |
223 | { | |
224 | save_state_t ss; | |
225 | addr = HPPAH_OFFSETOF (save_state_t, ss_flags); | |
226 | len = sizeof (ss.ss_flags); | |
227 | ||
228 | /* Note that ss_flags is always an int, no matter what | |
229 | REGISTER_RAW_SIZE(0) says. Assuming all HP-UX PA machines | |
230 | are big-endian, put it at the least significant end of the | |
231 | value, and zap the rest of the buffer. */ | |
232 | offset = REGISTER_RAW_SIZE (0) - len; | |
233 | memset (buf, 0, sizeof (buf)); | |
234 | } | |
c906108c | 235 | |
adf40b2e JM |
236 | /* Floating-point registers come from the ss_fpblock area. */ |
237 | else if (regno >= FP0_REGNUM) | |
238 | addr = (HPPAH_OFFSETOF (save_state_t, ss_fpblock) | |
62700349 | 239 | + (DEPRECATED_REGISTER_BYTE (regno) - DEPRECATED_REGISTER_BYTE (FP0_REGNUM))); |
adf40b2e JM |
240 | |
241 | /* Wide registers come from the ss_wide area. | |
242 | I think it's more PC to test (ss_flags & SS_WIDEREGS) to select | |
243 | between ss_wide and ss_narrow than to use the raw register size. | |
244 | But checking ss_flags would require an extra ptrace call for | |
245 | every register reference. Bleah. */ | |
246 | else if (len == 8) | |
247 | addr = (HPPAH_OFFSETOF (save_state_t, ss_wide) | |
62700349 | 248 | + DEPRECATED_REGISTER_BYTE (regno)); |
adf40b2e JM |
249 | |
250 | /* Narrow registers come from the ss_narrow area. Note that | |
251 | ss_narrow starts with gr1, not gr0. */ | |
252 | else if (len == 4) | |
253 | addr = (HPPAH_OFFSETOF (save_state_t, ss_narrow) | |
62700349 | 254 | + (DEPRECATED_REGISTER_BYTE (regno) - DEPRECATED_REGISTER_BYTE (1))); |
c906108c | 255 | |
adf40b2e | 256 | else |
8e65ff28 AC |
257 | internal_error (__FILE__, __LINE__, |
258 | "hppa-nat.c (fetch_register): unexpected register size"); | |
adf40b2e JM |
259 | |
260 | for (i = 0; i < len; i += sizeof (int)) | |
c906108c SS |
261 | { |
262 | errno = 0; | |
adf40b2e JM |
263 | /* Copy an int from the U area to buf. Fill the least |
264 | significant end if len != raw_size. */ | |
265 | * (int *) &buf[offset + i] = | |
39f77062 | 266 | call_ptrace (PT_RUREGS, PIDGET (inferior_ptid), |
adf40b2e | 267 | (PTRACE_ARG3_TYPE) addr + i, 0); |
c906108c SS |
268 | if (errno != 0) |
269 | { | |
adf40b2e JM |
270 | /* Warning, not error, in case we are attached; sometimes |
271 | the kernel doesn't let us at the registers. */ | |
c906108c SS |
272 | char *err = safe_strerror (errno); |
273 | char *msg = alloca (strlen (err) + 128); | |
adf40b2e JM |
274 | sprintf (msg, "reading `%s' register: %s", |
275 | REGISTER_NAME (regno), err); | |
c906108c | 276 | warning (msg); |
adf40b2e | 277 | return; |
c906108c SS |
278 | } |
279 | } | |
adf40b2e JM |
280 | |
281 | /* If we're reading an address from the instruction address queue, | |
282 | mask out the bottom two bits --- they contain the privilege | |
283 | level. */ | |
c906108c | 284 | if (regno == PCOQ_HEAD_REGNUM || regno == PCOQ_TAIL_REGNUM) |
adf40b2e JM |
285 | buf[len - 1] &= ~0x3; |
286 | ||
c906108c | 287 | supply_register (regno, buf); |
c906108c SS |
288 | } |
289 | ||
adf40b2e | 290 | |
c906108c SS |
291 | /* Copy LEN bytes to or from inferior's memory starting at MEMADDR |
292 | to debugger memory starting at MYADDR. Copy to inferior if | |
293 | WRITE is nonzero. | |
c5aa993b | 294 | |
c906108c SS |
295 | Returns the length copied, which is either the LEN argument or zero. |
296 | This xfer function does not do partial moves, since child_ops | |
297 | doesn't allow memory operations to cross below us in the target stack | |
8fef05cc | 298 | anyway. TARGET is ignored. */ |
c906108c SS |
299 | |
300 | int | |
8fef05cc | 301 | child_xfer_memory (CORE_ADDR memaddr, char *myaddr, int len, int write, |
240be855 | 302 | struct mem_attrib *mem, |
8fef05cc | 303 | struct target_ops *target) |
c906108c | 304 | { |
52f0bd74 | 305 | int i; |
c906108c | 306 | /* Round starting address down to longword boundary. */ |
52f0bd74 | 307 | CORE_ADDR addr = memaddr & - (CORE_ADDR)(sizeof (int)); |
c906108c | 308 | /* Round ending address up; get number of longwords that makes. */ |
52f0bd74 | 309 | int count |
c5aa993b | 310 | = (((memaddr + len) - addr) + sizeof (int) - 1) / sizeof (int); |
c906108c | 311 | |
b83266a0 SS |
312 | /* Allocate buffer of that many longwords. |
313 | Note -- do not use alloca to allocate this buffer since there is no | |
314 | guarantee of when the buffer will actually be deallocated. | |
315 | ||
316 | This routine can be called over and over with the same call chain; | |
317 | this (in effect) would pile up all those alloca requests until a call | |
318 | to alloca was made from a point higher than this routine in the | |
319 | call chain. */ | |
52f0bd74 | 320 | int *buffer = (int *) xmalloc (count * sizeof (int)); |
c906108c SS |
321 | |
322 | if (write) | |
323 | { | |
324 | /* Fill start and end extra bytes of buffer with existing memory data. */ | |
c5aa993b | 325 | if (addr != memaddr || len < (int) sizeof (int)) |
b83266a0 SS |
326 | { |
327 | /* Need part of initial word -- fetch it. */ | |
c5aa993b | 328 | buffer[0] = call_ptrace (addr < text_end ? PT_RIUSER : PT_RDUSER, |
39f77062 KB |
329 | PIDGET (inferior_ptid), |
330 | (PTRACE_ARG3_TYPE) addr, 0); | |
b83266a0 | 331 | } |
c906108c SS |
332 | |
333 | if (count > 1) /* FIXME, avoid if even boundary */ | |
334 | { | |
335 | buffer[count - 1] | |
b83266a0 | 336 | = call_ptrace (addr < text_end ? PT_RIUSER : PT_RDUSER, |
39f77062 | 337 | PIDGET (inferior_ptid), |
b83266a0 SS |
338 | (PTRACE_ARG3_TYPE) (addr |
339 | + (count - 1) * sizeof (int)), | |
340 | 0); | |
c906108c SS |
341 | } |
342 | ||
343 | /* Copy data to be written over corresponding part of buffer */ | |
c906108c SS |
344 | memcpy ((char *) buffer + (memaddr & (sizeof (int) - 1)), myaddr, len); |
345 | ||
346 | /* Write the entire buffer. */ | |
c906108c SS |
347 | for (i = 0; i < count; i++, addr += sizeof (int)) |
348 | { | |
b83266a0 SS |
349 | int pt_status; |
350 | int pt_request; | |
351 | /* The HP-UX kernel crashes if you use PT_WDUSER to write into the | |
352 | text segment. FIXME -- does it work to write into the data | |
353 | segment using WIUSER, or do these idiots really expect us to | |
354 | figure out which segment the address is in, so we can use a | |
355 | separate system call for it??! */ | |
c906108c | 356 | errno = 0; |
b83266a0 | 357 | pt_request = (addr < text_end) ? PT_WIUSER : PT_WDUSER; |
c906108c | 358 | pt_status = call_ptrace (pt_request, |
39f77062 | 359 | PIDGET (inferior_ptid), |
b83266a0 SS |
360 | (PTRACE_ARG3_TYPE) addr, |
361 | buffer[i]); | |
362 | ||
363 | /* Did we fail? Might we've guessed wrong about which | |
364 | segment this address resides in? Try the other request, | |
365 | and see if that works... */ | |
366 | if ((pt_status == -1) && errno) | |
367 | { | |
368 | errno = 0; | |
369 | pt_request = (pt_request == PT_WIUSER) ? PT_WDUSER : PT_WIUSER; | |
370 | pt_status = call_ptrace (pt_request, | |
39f77062 | 371 | PIDGET (inferior_ptid), |
b83266a0 SS |
372 | (PTRACE_ARG3_TYPE) addr, |
373 | buffer[i]); | |
374 | ||
375 | /* No, we still fail. Okay, time to punt. */ | |
376 | if ((pt_status == -1) && errno) | |
377 | { | |
b8c9b27d | 378 | xfree (buffer); |
b83266a0 SS |
379 | return 0; |
380 | } | |
381 | } | |
c906108c SS |
382 | } |
383 | } | |
384 | else | |
385 | { | |
386 | /* Read all the longwords */ | |
387 | for (i = 0; i < count; i++, addr += sizeof (int)) | |
388 | { | |
389 | errno = 0; | |
c5aa993b | 390 | buffer[i] = call_ptrace (addr < text_end ? PT_RIUSER : PT_RDUSER, |
39f77062 KB |
391 | PIDGET (inferior_ptid), |
392 | (PTRACE_ARG3_TYPE) addr, 0); | |
b83266a0 SS |
393 | if (errno) |
394 | { | |
b8c9b27d | 395 | xfree (buffer); |
b83266a0 SS |
396 | return 0; |
397 | } | |
c906108c SS |
398 | QUIT; |
399 | } | |
400 | ||
401 | /* Copy appropriate bytes out of the buffer. */ | |
402 | memcpy (myaddr, (char *) buffer + (memaddr & (sizeof (int) - 1)), len); | |
403 | } | |
b8c9b27d | 404 | xfree (buffer); |
c906108c SS |
405 | return len; |
406 | } | |
407 | ||
7d2830a3 | 408 | char *saved_child_execd_pathname = NULL; |
6604731b | 409 | int saved_vfork_pid; |
7d2830a3 DJ |
410 | enum { |
411 | STATE_NONE, | |
412 | STATE_GOT_CHILD, | |
413 | STATE_GOT_EXEC, | |
414 | STATE_GOT_PARENT, | |
415 | STATE_FAKE_EXEC | |
416 | } saved_vfork_state = STATE_NONE; | |
c906108c | 417 | |
6604731b DJ |
418 | int |
419 | child_follow_fork (int follow_child) | |
c906108c | 420 | { |
6604731b DJ |
421 | ptid_t last_ptid; |
422 | struct target_waitstatus last_status; | |
423 | int has_vforked; | |
424 | int parent_pid, child_pid; | |
425 | ||
426 | get_last_target_status (&last_ptid, &last_status); | |
427 | has_vforked = (last_status.kind == TARGET_WAITKIND_VFORKED); | |
428 | parent_pid = ptid_get_pid (last_ptid); | |
429 | child_pid = last_status.value.related_pid; | |
430 | ||
431 | /* At this point, if we are vforking, breakpoints were already | |
432 | detached from the child in child_wait; and the child has already | |
433 | called execve(). If we are forking, both the parent and child | |
434 | have breakpoints inserted. */ | |
435 | ||
436 | if (! follow_child) | |
c906108c | 437 | { |
6604731b DJ |
438 | if (! has_vforked) |
439 | { | |
440 | detach_breakpoints (child_pid); | |
441 | #ifdef SOLIB_REMOVE_INFERIOR_HOOK | |
442 | SOLIB_REMOVE_INFERIOR_HOOK (child_pid); | |
443 | #endif | |
444 | } | |
445 | ||
446 | /* Detach from the child. */ | |
4c9ba7e0 DJ |
447 | printf_unfiltered ("Detaching after fork from %s\n", |
448 | target_pid_to_str (pid_to_ptid (child_pid))); | |
449 | hppa_require_detach (child_pid, 0); | |
6604731b DJ |
450 | |
451 | /* The parent and child of a vfork share the same address space. | |
452 | Also, on some targets the order in which vfork and exec events | |
453 | are received for parent in child requires some delicate handling | |
454 | of the events. | |
455 | ||
456 | For instance, on ptrace-based HPUX we receive the child's vfork | |
457 | event first, at which time the parent has been suspended by the | |
458 | OS and is essentially untouchable until the child's exit or second | |
459 | exec event arrives. At that time, the parent's vfork event is | |
460 | delivered to us, and that's when we see and decide how to follow | |
461 | the vfork. But to get to that point, we must continue the child | |
462 | until it execs or exits. To do that smoothly, all breakpoints | |
463 | must be removed from the child, in case there are any set between | |
464 | the vfork() and exec() calls. But removing them from the child | |
465 | also removes them from the parent, due to the shared-address-space | |
466 | nature of a vfork'd parent and child. On HPUX, therefore, we must | |
467 | take care to restore the bp's to the parent before we continue it. | |
468 | Else, it's likely that we may not stop in the expected place. (The | |
469 | worst scenario is when the user tries to step over a vfork() call; | |
470 | the step-resume bp must be restored for the step to properly stop | |
471 | in the parent after the call completes!) | |
472 | ||
473 | Sequence of events, as reported to gdb from HPUX: | |
474 | ||
475 | Parent Child Action for gdb to take | |
476 | ------------------------------------------------------- | |
477 | 1 VFORK Continue child | |
478 | 2 EXEC | |
479 | 3 EXEC or EXIT | |
480 | 4 VFORK | |
481 | ||
482 | Now that the child has safely exec'd or exited, we must restore | |
483 | the parent's breakpoints before we continue it. Else, we may | |
484 | cause it run past expected stopping points. */ | |
485 | ||
486 | if (has_vforked) | |
487 | reattach_breakpoints (parent_pid); | |
c906108c | 488 | } |
6604731b DJ |
489 | else |
490 | { | |
6604731b DJ |
491 | /* Needed to keep the breakpoint lists in sync. */ |
492 | if (! has_vforked) | |
493 | detach_breakpoints (child_pid); | |
7d2830a3 | 494 | |
6604731b DJ |
495 | /* Before detaching from the parent, remove all breakpoints from it. */ |
496 | remove_breakpoints (); | |
497 | ||
498 | /* Also reset the solib inferior hook from the parent. */ | |
499 | #ifdef SOLIB_REMOVE_INFERIOR_HOOK | |
500 | SOLIB_REMOVE_INFERIOR_HOOK (PIDGET (inferior_ptid)); | |
501 | #endif | |
7d2830a3 | 502 | |
6604731b DJ |
503 | /* Detach from the parent. */ |
504 | target_detach (NULL, 1); | |
505 | ||
506 | /* Attach to the child. */ | |
4c9ba7e0 DJ |
507 | printf_unfiltered ("Attaching after fork to %s\n", |
508 | target_pid_to_str (pid_to_ptid (child_pid))); | |
509 | hppa_require_attach (child_pid); | |
6604731b | 510 | inferior_ptid = pid_to_ptid (child_pid); |
6604731b DJ |
511 | |
512 | /* If we vforked, then we've also execed by now. The exec will be | |
513 | reported momentarily. follow_exec () will handle breakpoints, so | |
514 | we don't have to.. */ | |
515 | if (!has_vforked) | |
516 | follow_inferior_reset_breakpoints (); | |
517 | } | |
518 | ||
519 | if (has_vforked) | |
c906108c | 520 | { |
6604731b DJ |
521 | /* If we followed the parent, don't try to follow the child's exec. */ |
522 | if (saved_vfork_state != STATE_GOT_PARENT | |
523 | && saved_vfork_state != STATE_FAKE_EXEC) | |
524 | fprintf_unfiltered (gdb_stdout, | |
525 | "hppa: post follow vfork: confused state\n"); | |
526 | ||
527 | if (! follow_child || saved_vfork_state == STATE_GOT_PARENT) | |
528 | saved_vfork_state = STATE_NONE; | |
529 | else | |
530 | return 1; | |
c906108c | 531 | } |
6604731b | 532 | return 0; |
c906108c SS |
533 | } |
534 | ||
b83266a0 SS |
535 | /* Format a process id, given PID. Be sure to terminate |
536 | this with a null--it's going to be printed via a "%s". */ | |
c906108c | 537 | char * |
39f77062 | 538 | child_pid_to_str (ptid_t ptid) |
c906108c | 539 | { |
c5aa993b JM |
540 | /* Static because address returned */ |
541 | static char buf[30]; | |
39f77062 | 542 | pid_t pid = PIDGET (ptid); |
c906108c | 543 | |
ce414844 AC |
544 | /* Extra NUL for paranoia's sake */ |
545 | sprintf (buf, "process %d%c", pid, '\0'); | |
c5aa993b JM |
546 | |
547 | return buf; | |
c906108c SS |
548 | } |
549 | ||
b83266a0 SS |
550 | /* Format a thread id, given TID. Be sure to terminate |
551 | this with a null--it's going to be printed via a "%s". | |
552 | ||
553 | Note: This is a core-gdb tid, not the actual system tid. | |
c5aa993b | 554 | See infttrace.c for details. */ |
c906108c | 555 | char * |
39f77062 | 556 | hppa_tid_to_str (ptid_t ptid) |
c906108c | 557 | { |
c5aa993b JM |
558 | /* Static because address returned */ |
559 | static char buf[30]; | |
39f77062 KB |
560 | /* This seems strange, but when I did the ptid conversion, it looked |
561 | as though a pid was always being passed. - Kevin Buettner */ | |
562 | pid_t tid = PIDGET (ptid); | |
c5aa993b JM |
563 | |
564 | /* Extra NULLs for paranoia's sake */ | |
ce414844 | 565 | sprintf (buf, "system thread %d%c", tid, '\0'); |
c906108c | 566 | |
c5aa993b | 567 | return buf; |
c906108c SS |
568 | } |
569 | ||
47932f85 DJ |
570 | /*## */ |
571 | /* Enable HACK for ttrace work. In | |
572 | * infttrace.c/require_notification_of_events, | |
573 | * this is set to 0 so that the loop in child_wait | |
574 | * won't loop. | |
575 | */ | |
576 | int not_same_real_pid = 1; | |
577 | /*## */ | |
578 | ||
47932f85 DJ |
579 | /* Wait for child to do something. Return pid of child, or -1 in case |
580 | of error; store status through argument pointer OURSTATUS. */ | |
581 | ||
582 | ptid_t | |
583 | child_wait (ptid_t ptid, struct target_waitstatus *ourstatus) | |
584 | { | |
585 | int save_errno; | |
586 | int status; | |
587 | char *execd_pathname = NULL; | |
588 | int exit_status; | |
589 | int related_pid; | |
590 | int syscall_id; | |
591 | enum target_waitkind kind; | |
592 | int pid; | |
593 | ||
7d2830a3 DJ |
594 | if (saved_vfork_state == STATE_FAKE_EXEC) |
595 | { | |
596 | saved_vfork_state = STATE_NONE; | |
597 | ourstatus->kind = TARGET_WAITKIND_EXECD; | |
598 | ourstatus->value.execd_pathname = saved_child_execd_pathname; | |
599 | return inferior_ptid; | |
600 | } | |
601 | ||
47932f85 DJ |
602 | do |
603 | { | |
604 | set_sigint_trap (); /* Causes SIGINT to be passed on to the | |
605 | attached process. */ | |
606 | set_sigio_trap (); | |
607 | ||
608 | pid = ptrace_wait (inferior_ptid, &status); | |
609 | ||
610 | save_errno = errno; | |
611 | ||
612 | clear_sigio_trap (); | |
613 | ||
614 | clear_sigint_trap (); | |
615 | ||
616 | if (pid == -1) | |
617 | { | |
618 | if (save_errno == EINTR) | |
619 | continue; | |
620 | ||
621 | fprintf_unfiltered (gdb_stderr, "Child process unexpectedly missing: %s.\n", | |
622 | safe_strerror (save_errno)); | |
623 | ||
624 | /* Claim it exited with unknown signal. */ | |
625 | ourstatus->kind = TARGET_WAITKIND_SIGNALLED; | |
626 | ourstatus->value.sig = TARGET_SIGNAL_UNKNOWN; | |
627 | return pid_to_ptid (-1); | |
628 | } | |
629 | ||
630 | /* Did it exit? | |
631 | */ | |
632 | if (target_has_exited (pid, status, &exit_status)) | |
633 | { | |
634 | /* ??rehrauer: For now, ignore this. */ | |
635 | continue; | |
636 | } | |
637 | ||
638 | if (!target_thread_alive (pid_to_ptid (pid))) | |
639 | { | |
640 | ourstatus->kind = TARGET_WAITKIND_SPURIOUS; | |
641 | return pid_to_ptid (pid); | |
642 | } | |
643 | ||
8e7d2c16 | 644 | if (hpux_has_forked (pid, &related_pid)) |
47932f85 | 645 | { |
8e7d2c16 DJ |
646 | /* Ignore the parent's fork event. */ |
647 | if (pid == PIDGET (inferior_ptid)) | |
648 | { | |
649 | ourstatus->kind = TARGET_WAITKIND_IGNORE; | |
650 | return inferior_ptid; | |
651 | } | |
652 | ||
653 | /* If this is the child's fork event, report that the | |
654 | process has forked. */ | |
655 | if (related_pid == PIDGET (inferior_ptid)) | |
656 | { | |
657 | ourstatus->kind = TARGET_WAITKIND_FORKED; | |
658 | ourstatus->value.related_pid = pid; | |
659 | return inferior_ptid; | |
660 | } | |
47932f85 DJ |
661 | } |
662 | ||
7d2830a3 | 663 | if (hpux_has_vforked (pid, &related_pid)) |
47932f85 | 664 | { |
7d2830a3 DJ |
665 | if (pid == PIDGET (inferior_ptid)) |
666 | { | |
667 | if (saved_vfork_state == STATE_GOT_CHILD) | |
668 | saved_vfork_state = STATE_GOT_PARENT; | |
669 | else if (saved_vfork_state == STATE_GOT_EXEC) | |
670 | saved_vfork_state = STATE_FAKE_EXEC; | |
671 | else | |
672 | fprintf_unfiltered (gdb_stdout, | |
673 | "hppah: parent vfork: confused\n"); | |
674 | } | |
675 | else if (related_pid == PIDGET (inferior_ptid)) | |
676 | { | |
677 | if (saved_vfork_state == STATE_NONE) | |
678 | saved_vfork_state = STATE_GOT_CHILD; | |
679 | else | |
680 | fprintf_unfiltered (gdb_stdout, | |
681 | "hppah: child vfork: confused\n"); | |
682 | } | |
683 | else | |
684 | fprintf_unfiltered (gdb_stdout, | |
685 | "hppah: unknown vfork: confused\n"); | |
686 | ||
687 | if (saved_vfork_state == STATE_GOT_CHILD) | |
688 | { | |
689 | child_post_startup_inferior (pid_to_ptid (pid)); | |
6604731b DJ |
690 | detach_breakpoints (pid); |
691 | #ifdef SOLIB_REMOVE_INFERIOR_HOOK | |
692 | SOLIB_REMOVE_INFERIOR_HOOK (pid); | |
693 | #endif | |
694 | child_resume (pid_to_ptid (pid), 0, TARGET_SIGNAL_0); | |
695 | ourstatus->kind = TARGET_WAITKIND_IGNORE; | |
696 | return pid_to_ptid (related_pid); | |
7d2830a3 | 697 | } |
6604731b | 698 | else if (saved_vfork_state == STATE_FAKE_EXEC) |
7d2830a3 DJ |
699 | { |
700 | ourstatus->kind = TARGET_WAITKIND_VFORKED; | |
701 | ourstatus->value.related_pid = related_pid; | |
702 | return pid_to_ptid (pid); | |
703 | } | |
6604731b DJ |
704 | else |
705 | { | |
706 | /* We saw the parent's vfork, but we haven't seen the exec yet. | |
707 | Wait for it, for simplicity's sake. It should be pending. */ | |
708 | saved_vfork_pid = related_pid; | |
709 | ourstatus->kind = TARGET_WAITKIND_IGNORE; | |
710 | return pid_to_ptid (pid); | |
711 | } | |
47932f85 DJ |
712 | } |
713 | ||
714 | if (hpux_has_execd (pid, &execd_pathname)) | |
715 | { | |
7d2830a3 DJ |
716 | /* On HP-UX, events associated with a vforking inferior come in |
717 | threes: a vfork event for the child (always first), followed | |
718 | a vfork event for the parent and an exec event for the child. | |
6604731b DJ |
719 | The latter two can come in either order. Make sure we get |
720 | both. */ | |
721 | if (saved_vfork_state != STATE_NONE) | |
7d2830a3 | 722 | { |
6604731b DJ |
723 | if (saved_vfork_state == STATE_GOT_CHILD) |
724 | { | |
725 | saved_vfork_state = STATE_GOT_EXEC; | |
726 | /* On HP/UX with ptrace, the child must be resumed before | |
727 | the parent vfork event is delivered. A single-step | |
728 | suffices. */ | |
729 | if (RESUME_EXECD_VFORKING_CHILD_TO_GET_PARENT_VFORK ()) | |
730 | target_resume (pid_to_ptid (pid), 1, TARGET_SIGNAL_0); | |
731 | ourstatus->kind = TARGET_WAITKIND_IGNORE; | |
732 | } | |
733 | else if (saved_vfork_state == STATE_GOT_PARENT) | |
734 | { | |
735 | saved_vfork_state = STATE_FAKE_EXEC; | |
736 | ourstatus->kind = TARGET_WAITKIND_VFORKED; | |
737 | ourstatus->value.related_pid = saved_vfork_pid; | |
738 | } | |
739 | else | |
740 | fprintf_unfiltered (gdb_stdout, | |
741 | "hppa: exec: unexpected state\n"); | |
7d2830a3 | 742 | |
6604731b | 743 | saved_child_execd_pathname = execd_pathname; |
7d2830a3 | 744 | |
7d2830a3 DJ |
745 | return inferior_ptid; |
746 | } | |
747 | ||
47932f85 DJ |
748 | /* Are we ignoring initial exec events? (This is likely because |
749 | we're in the process of starting up the inferior, and another | |
750 | (older) mechanism handles those.) If so, we'll report this | |
751 | as a regular stop, not an exec. | |
752 | */ | |
753 | if (inferior_ignoring_startup_exec_events) | |
754 | { | |
755 | inferior_ignoring_startup_exec_events--; | |
756 | } | |
757 | else | |
758 | { | |
759 | ourstatus->kind = TARGET_WAITKIND_EXECD; | |
760 | ourstatus->value.execd_pathname = execd_pathname; | |
761 | return pid_to_ptid (pid); | |
762 | } | |
763 | } | |
764 | ||
765 | /* All we must do with these is communicate their occurrence | |
766 | to wait_for_inferior... | |
767 | */ | |
768 | if (hpux_has_syscall_event (pid, &kind, &syscall_id)) | |
769 | { | |
770 | ourstatus->kind = kind; | |
771 | ourstatus->value.syscall_id = syscall_id; | |
772 | return pid_to_ptid (pid); | |
773 | } | |
774 | ||
775 | /*## } while (pid != PIDGET (inferior_ptid)); ## *//* Some other child died or stopped */ | |
776 | /* hack for thread testing */ | |
777 | } | |
778 | while ((pid != PIDGET (inferior_ptid)) && not_same_real_pid); | |
779 | /*## */ | |
780 | ||
781 | store_waitstatus (ourstatus, status); | |
782 | return pid_to_ptid (pid); | |
783 | } | |
784 | ||
c906108c SS |
785 | #if !defined (GDB_NATIVE_HPUX_11) |
786 | ||
787 | /* The following code is a substitute for the infttrace.c versions used | |
788 | with ttrace() in HPUX 11. */ | |
789 | ||
790 | /* This value is an arbitrary integer. */ | |
791 | #define PT_VERSION 123456 | |
792 | ||
793 | /* This semaphore is used to coordinate the child and parent processes | |
794 | after a fork(), and before an exec() by the child. See | |
795 | parent_attach_all for details. */ | |
796 | ||
c5aa993b JM |
797 | typedef struct |
798 | { | |
799 | int parent_channel[2]; /* Parent "talks" to [1], child "listens" to [0] */ | |
800 | int child_channel[2]; /* Child "talks" to [1], parent "listens" to [0] */ | |
801 | } | |
802 | startup_semaphore_t; | |
c906108c SS |
803 | |
804 | #define SEM_TALK (1) | |
805 | #define SEM_LISTEN (0) | |
806 | ||
c5aa993b | 807 | static startup_semaphore_t startup_semaphore; |
c906108c | 808 | |
c906108c SS |
809 | #ifdef PT_SETTRC |
810 | /* This function causes the caller's process to be traced by its | |
811 | parent. This is intended to be called after GDB forks itself, | |
812 | and before the child execs the target. | |
813 | ||
814 | Note that HP-UX ptrace is rather funky in how this is done. | |
815 | If the parent wants to get the initial exec event of a child, | |
816 | it must set the ptrace event mask of the child to include execs. | |
817 | (The child cannot do this itself.) This must be done after the | |
818 | child is forked, but before it execs. | |
819 | ||
820 | To coordinate the parent and child, we implement a semaphore using | |
821 | pipes. After SETTRC'ing itself, the child tells the parent that | |
822 | it is now traceable by the parent, and waits for the parent's | |
823 | acknowledgement. The parent can then set the child's event mask, | |
824 | and notify the child that it can now exec. | |
825 | ||
826 | (The acknowledgement by parent happens as a result of a call to | |
827 | child_acknowledge_created_inferior.) */ | |
828 | ||
829 | int | |
fba45db2 | 830 | parent_attach_all (int pid, PTRACE_ARG3_TYPE addr, int data) |
c906108c SS |
831 | { |
832 | int pt_status = 0; | |
833 | ||
834 | /* We need a memory home for a constant. */ | |
835 | int tc_magic_child = PT_VERSION; | |
836 | int tc_magic_parent = 0; | |
837 | ||
838 | /* The remainder of this function is only useful for HPUX 10.0 and | |
839 | later, as it depends upon the ability to request notification | |
840 | of specific kinds of events by the kernel. */ | |
841 | #if defined(PT_SET_EVENT_MASK) | |
842 | ||
843 | /* Notify the parent that we're potentially ready to exec(). */ | |
844 | write (startup_semaphore.child_channel[SEM_TALK], | |
b83266a0 SS |
845 | &tc_magic_child, |
846 | sizeof (tc_magic_child)); | |
c906108c SS |
847 | |
848 | /* Wait for acknowledgement from the parent. */ | |
849 | read (startup_semaphore.parent_channel[SEM_LISTEN], | |
b83266a0 SS |
850 | &tc_magic_parent, |
851 | sizeof (tc_magic_parent)); | |
c906108c | 852 | if (tc_magic_child != tc_magic_parent) |
c5aa993b | 853 | warning ("mismatched semaphore magic"); |
c906108c SS |
854 | |
855 | /* Discard our copy of the semaphore. */ | |
856 | (void) close (startup_semaphore.parent_channel[SEM_LISTEN]); | |
857 | (void) close (startup_semaphore.parent_channel[SEM_TALK]); | |
858 | (void) close (startup_semaphore.child_channel[SEM_LISTEN]); | |
859 | (void) close (startup_semaphore.child_channel[SEM_TALK]); | |
860 | #endif | |
c5aa993b | 861 | |
c906108c SS |
862 | return 0; |
863 | } | |
864 | #endif | |
865 | ||
866 | int | |
fba45db2 | 867 | hppa_require_attach (int pid) |
c906108c SS |
868 | { |
869 | int pt_status; | |
b83266a0 SS |
870 | CORE_ADDR pc; |
871 | CORE_ADDR pc_addr; | |
c906108c SS |
872 | unsigned int regs_offset; |
873 | ||
874 | /* Are we already attached? There appears to be no explicit way to | |
875 | answer this via ptrace, so we try something which should be | |
876 | innocuous if we are attached. If that fails, then we assume | |
877 | we're not attached, and so attempt to make it so. */ | |
878 | ||
879 | errno = 0; | |
880 | regs_offset = U_REGS_OFFSET; | |
881 | pc_addr = register_addr (PC_REGNUM, regs_offset); | |
882 | pc = call_ptrace (PT_READ_U, pid, (PTRACE_ARG3_TYPE) pc_addr, 0); | |
883 | ||
884 | if (errno) | |
885 | { | |
886 | errno = 0; | |
887 | pt_status = call_ptrace (PT_ATTACH, pid, (PTRACE_ARG3_TYPE) 0, 0); | |
888 | ||
889 | if (errno) | |
b83266a0 | 890 | return -1; |
c906108c SS |
891 | |
892 | /* Now we really are attached. */ | |
893 | errno = 0; | |
894 | } | |
895 | attach_flag = 1; | |
896 | return pid; | |
897 | } | |
898 | ||
899 | int | |
fba45db2 | 900 | hppa_require_detach (int pid, int signal) |
c906108c SS |
901 | { |
902 | errno = 0; | |
903 | call_ptrace (PT_DETACH, pid, (PTRACE_ARG3_TYPE) 1, signal); | |
c5aa993b | 904 | errno = 0; /* Ignore any errors. */ |
c906108c SS |
905 | return pid; |
906 | } | |
907 | ||
908 | /* Since ptrace doesn't support memory page-protection events, which | |
909 | are used to implement "hardware" watchpoints on HP-UX, these are | |
910 | dummy versions, which perform no useful work. */ | |
911 | ||
912 | void | |
fba45db2 | 913 | hppa_enable_page_protection_events (int pid) |
c906108c SS |
914 | { |
915 | } | |
916 | ||
917 | void | |
fba45db2 | 918 | hppa_disable_page_protection_events (int pid) |
c906108c SS |
919 | { |
920 | } | |
921 | ||
922 | int | |
fba45db2 | 923 | hppa_insert_hw_watchpoint (int pid, CORE_ADDR start, LONGEST len, int type) |
c906108c SS |
924 | { |
925 | error ("Hardware watchpoints not implemented on this platform."); | |
926 | } | |
927 | ||
928 | int | |
65e82032 | 929 | hppa_remove_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_can_use_hw_watchpoint (int type, int cnt, int ot) |
c906108c SS |
936 | { |
937 | return 0; | |
938 | } | |
939 | ||
940 | int | |
fba45db2 | 941 | hppa_range_profitable_for_hw_watchpoint (int pid, CORE_ADDR start, LONGEST len) |
c906108c SS |
942 | { |
943 | error ("Hardware watchpoints not implemented on this platform."); | |
944 | } | |
945 | ||
946 | char * | |
39f77062 | 947 | hppa_pid_or_tid_to_str (ptid_t id) |
c906108c SS |
948 | { |
949 | /* In the ptrace world, there are only processes. */ | |
ed9a39eb | 950 | return child_pid_to_str (id); |
c906108c SS |
951 | } |
952 | ||
c906108c | 953 | void |
fba45db2 | 954 | hppa_ensure_vforking_parent_remains_stopped (int pid) |
c906108c SS |
955 | { |
956 | /* This assumes that the vforked parent is presently stopped, and | |
957 | that the vforked child has just delivered its first exec event. | |
958 | Calling kill() this way will cause the SIGTRAP to be delivered as | |
959 | soon as the parent is resumed, which happens as soon as the | |
960 | vforked child is resumed. See wait_for_inferior for the use of | |
961 | this function. */ | |
962 | kill (pid, SIGTRAP); | |
963 | } | |
964 | ||
965 | int | |
fba45db2 | 966 | hppa_resume_execd_vforking_child_to_get_parent_vfork (void) |
c906108c | 967 | { |
c5aa993b | 968 | return 1; /* Yes, the child must be resumed. */ |
c906108c SS |
969 | } |
970 | ||
971 | void | |
fba45db2 | 972 | require_notification_of_events (int pid) |
c906108c SS |
973 | { |
974 | #if defined(PT_SET_EVENT_MASK) | |
975 | int pt_status; | |
976 | ptrace_event_t ptrace_events; | |
c2d11a7d JM |
977 | int nsigs; |
978 | int signum; | |
c906108c SS |
979 | |
980 | /* Instruct the kernel as to the set of events we wish to be | |
981 | informed of. (This support does not exist before HPUX 10.0. | |
982 | We'll assume if PT_SET_EVENT_MASK has not been defined by | |
b83266a0 | 983 | <sys/ptrace.h>, then we're being built on pre-10.0.) */ |
c906108c SS |
984 | memset (&ptrace_events, 0, sizeof (ptrace_events)); |
985 | ||
986 | /* Note: By default, all signals are visible to us. If we wish | |
987 | the kernel to keep certain signals hidden from us, we do it | |
988 | by calling sigdelset (ptrace_events.pe_signals, signal) for | |
b83266a0 | 989 | each such signal here, before doing PT_SET_EVENT_MASK. */ |
c2d11a7d JM |
990 | /* RM: The above comment is no longer true. We start with ignoring |
991 | all signals, and then add the ones we are interested in. We could | |
992 | do it the other way: start by looking at all signals and then | |
993 | deleting the ones that we aren't interested in, except that | |
994 | multiple gdb signals may be mapped to the same host signal | |
995 | (eg. TARGET_SIGNAL_IO and TARGET_SIGNAL_POLL both get mapped to | |
996 | signal 22 on HPUX 10.20) We want to be notified if we are | |
997 | interested in either signal. */ | |
998 | sigfillset (&ptrace_events.pe_signals); | |
999 | ||
1000 | /* RM: Let's not bother with signals we don't care about */ | |
1001 | nsigs = (int) TARGET_SIGNAL_LAST; | |
1002 | for (signum = nsigs; signum > 0; signum--) | |
1003 | { | |
1004 | if ((signal_stop_state (signum)) || | |
1005 | (signal_print_state (signum)) || | |
1006 | (!signal_pass_state (signum))) | |
1007 | { | |
1008 | if (target_signal_to_host_p (signum)) | |
1009 | sigdelset (&ptrace_events.pe_signals, | |
1010 | target_signal_to_host (signum)); | |
1011 | } | |
1012 | } | |
c906108c SS |
1013 | |
1014 | ptrace_events.pe_set_event = 0; | |
1015 | ||
1016 | ptrace_events.pe_set_event |= PTRACE_SIGNAL; | |
1017 | ptrace_events.pe_set_event |= PTRACE_EXEC; | |
1018 | ptrace_events.pe_set_event |= PTRACE_FORK; | |
1019 | ptrace_events.pe_set_event |= PTRACE_VFORK; | |
1020 | /* ??rehrauer: Add this one when we're prepared to catch it... | |
c5aa993b JM |
1021 | ptrace_events.pe_set_event |= PTRACE_EXIT; |
1022 | */ | |
c906108c SS |
1023 | |
1024 | errno = 0; | |
1025 | pt_status = call_ptrace (PT_SET_EVENT_MASK, | |
c5aa993b JM |
1026 | pid, |
1027 | (PTRACE_ARG3_TYPE) & ptrace_events, | |
1028 | sizeof (ptrace_events)); | |
c906108c SS |
1029 | if (errno) |
1030 | perror_with_name ("ptrace"); | |
1031 | if (pt_status < 0) | |
1032 | return; | |
1033 | #endif | |
1034 | } | |
1035 | ||
1036 | void | |
fba45db2 | 1037 | require_notification_of_exec_events (int pid) |
c906108c SS |
1038 | { |
1039 | #if defined(PT_SET_EVENT_MASK) | |
1040 | int pt_status; | |
1041 | ptrace_event_t ptrace_events; | |
1042 | ||
1043 | /* Instruct the kernel as to the set of events we wish to be | |
1044 | informed of. (This support does not exist before HPUX 10.0. | |
1045 | We'll assume if PT_SET_EVENT_MASK has not been defined by | |
b83266a0 | 1046 | <sys/ptrace.h>, then we're being built on pre-10.0.) */ |
c906108c SS |
1047 | memset (&ptrace_events, 0, sizeof (ptrace_events)); |
1048 | ||
1049 | /* Note: By default, all signals are visible to us. If we wish | |
1050 | the kernel to keep certain signals hidden from us, we do it | |
1051 | by calling sigdelset (ptrace_events.pe_signals, signal) for | |
b83266a0 | 1052 | each such signal here, before doing PT_SET_EVENT_MASK. */ |
c906108c SS |
1053 | sigemptyset (&ptrace_events.pe_signals); |
1054 | ||
1055 | ptrace_events.pe_set_event = 0; | |
1056 | ||
1057 | ptrace_events.pe_set_event |= PTRACE_EXEC; | |
1058 | /* ??rehrauer: Add this one when we're prepared to catch it... | |
c5aa993b JM |
1059 | ptrace_events.pe_set_event |= PTRACE_EXIT; |
1060 | */ | |
c906108c SS |
1061 | |
1062 | errno = 0; | |
1063 | pt_status = call_ptrace (PT_SET_EVENT_MASK, | |
c5aa993b JM |
1064 | pid, |
1065 | (PTRACE_ARG3_TYPE) & ptrace_events, | |
1066 | sizeof (ptrace_events)); | |
c906108c SS |
1067 | if (errno) |
1068 | perror_with_name ("ptrace"); | |
1069 | if (pt_status < 0) | |
1070 | return; | |
1071 | #endif | |
1072 | } | |
1073 | ||
1074 | /* This function is called by the parent process, with pid being the | |
1075 | ID of the child process, after the debugger has forked. */ | |
1076 | ||
1077 | void | |
fba45db2 | 1078 | child_acknowledge_created_inferior (int pid) |
c906108c SS |
1079 | { |
1080 | /* We need a memory home for a constant. */ | |
1081 | int tc_magic_parent = PT_VERSION; | |
1082 | int tc_magic_child = 0; | |
1083 | ||
b83266a0 SS |
1084 | /* The remainder of this function is only useful for HPUX 10.0 and |
1085 | later, as it depends upon the ability to request notification | |
1086 | of specific kinds of events by the kernel. */ | |
1087 | #if defined(PT_SET_EVENT_MASK) | |
c906108c SS |
1088 | /* Wait for the child to tell us that it has forked. */ |
1089 | read (startup_semaphore.child_channel[SEM_LISTEN], | |
b83266a0 | 1090 | &tc_magic_child, |
c5aa993b | 1091 | sizeof (tc_magic_child)); |
c906108c SS |
1092 | |
1093 | /* Notify the child that it can exec. | |
1094 | ||
1095 | In the infttrace.c variant of this function, we set the child's | |
1096 | event mask after the fork but before the exec. In the ptrace | |
1097 | world, it seems we can't set the event mask until after the exec. */ | |
c906108c | 1098 | write (startup_semaphore.parent_channel[SEM_TALK], |
b83266a0 SS |
1099 | &tc_magic_parent, |
1100 | sizeof (tc_magic_parent)); | |
c906108c SS |
1101 | |
1102 | /* We'd better pause a bit before trying to set the event mask, | |
1103 | though, to ensure that the exec has happened. We don't want to | |
1104 | wait() on the child, because that'll screw up the upper layers | |
1105 | of gdb's execution control that expect to see the exec event. | |
1106 | ||
1107 | After an exec, the child is no longer executing gdb code. Hence, | |
1108 | we can't have yet another synchronization via the pipes. We'll | |
1109 | just sleep for a second, and hope that's enough delay... */ | |
c906108c SS |
1110 | sleep (1); |
1111 | ||
1112 | /* Instruct the kernel as to the set of events we wish to be | |
1113 | informed of. */ | |
c906108c SS |
1114 | require_notification_of_exec_events (pid); |
1115 | ||
1116 | /* Discard our copy of the semaphore. */ | |
1117 | (void) close (startup_semaphore.parent_channel[SEM_LISTEN]); | |
1118 | (void) close (startup_semaphore.parent_channel[SEM_TALK]); | |
1119 | (void) close (startup_semaphore.child_channel[SEM_LISTEN]); | |
1120 | (void) close (startup_semaphore.child_channel[SEM_TALK]); | |
b83266a0 | 1121 | #endif |
c906108c SS |
1122 | } |
1123 | ||
1124 | void | |
39f77062 | 1125 | child_post_startup_inferior (ptid_t ptid) |
c906108c | 1126 | { |
39f77062 | 1127 | require_notification_of_events (PIDGET (ptid)); |
c906108c SS |
1128 | } |
1129 | ||
1130 | void | |
fba45db2 | 1131 | child_post_attach (int pid) |
c906108c SS |
1132 | { |
1133 | require_notification_of_events (pid); | |
1134 | } | |
1135 | ||
1136 | int | |
fba45db2 | 1137 | child_insert_fork_catchpoint (int pid) |
c906108c SS |
1138 | { |
1139 | /* This request is only available on HPUX 10.0 and later. */ | |
1140 | #if !defined(PT_SET_EVENT_MASK) | |
1141 | error ("Unable to catch forks prior to HPUX 10.0"); | |
1142 | #else | |
1143 | /* Enable reporting of fork events from the kernel. */ | |
1144 | /* ??rehrauer: For the moment, we're always enabling these events, | |
b83266a0 | 1145 | and just ignoring them if there's no catchpoint to catch them. */ |
c906108c SS |
1146 | return 0; |
1147 | #endif | |
1148 | } | |
1149 | ||
1150 | int | |
fba45db2 | 1151 | child_remove_fork_catchpoint (int pid) |
c906108c SS |
1152 | { |
1153 | /* This request is only available on HPUX 10.0 and later. */ | |
1154 | #if !defined(PT_SET_EVENT_MASK) | |
1155 | error ("Unable to catch forks prior to HPUX 10.0"); | |
1156 | #else | |
1157 | /* Disable reporting of fork events from the kernel. */ | |
1158 | /* ??rehrauer: For the moment, we're always enabling these events, | |
1159 | and just ignoring them if there's no catchpoint to catch them. */ | |
1160 | return 0; | |
1161 | #endif | |
1162 | } | |
1163 | ||
1164 | int | |
fba45db2 | 1165 | child_insert_vfork_catchpoint (int pid) |
c906108c SS |
1166 | { |
1167 | /* This request is only available on HPUX 10.0 and later. */ | |
1168 | #if !defined(PT_SET_EVENT_MASK) | |
1169 | error ("Unable to catch vforks prior to HPUX 10.0"); | |
1170 | #else | |
1171 | /* Enable reporting of vfork events from the kernel. */ | |
1172 | /* ??rehrauer: For the moment, we're always enabling these events, | |
1173 | and just ignoring them if there's no catchpoint to catch them. */ | |
1174 | return 0; | |
1175 | #endif | |
1176 | } | |
1177 | ||
1178 | int | |
fba45db2 | 1179 | child_remove_vfork_catchpoint (int pid) |
c906108c SS |
1180 | { |
1181 | /* This request is only available on HPUX 10.0 and later. */ | |
1182 | #if !defined(PT_SET_EVENT_MASK) | |
1183 | error ("Unable to catch vforks prior to HPUX 10.0"); | |
1184 | #else | |
1185 | /* Disable reporting of vfork events from the kernel. */ | |
1186 | /* ??rehrauer: For the moment, we're always enabling these events, | |
1187 | and just ignoring them if there's no catchpoint to catch them. */ | |
1188 | return 0; | |
1189 | #endif | |
1190 | } | |
1191 | ||
1192 | int | |
47932f85 | 1193 | hpux_has_forked (int pid, int *childpid) |
c906108c SS |
1194 | { |
1195 | /* This request is only available on HPUX 10.0 and later. */ | |
1196 | #if !defined(PT_GET_PROCESS_STATE) | |
1197 | *childpid = 0; | |
1198 | return 0; | |
1199 | #else | |
1200 | int pt_status; | |
c5aa993b | 1201 | ptrace_state_t ptrace_state; |
c906108c SS |
1202 | |
1203 | errno = 0; | |
1204 | pt_status = call_ptrace (PT_GET_PROCESS_STATE, | |
b83266a0 | 1205 | pid, |
c5aa993b | 1206 | (PTRACE_ARG3_TYPE) & ptrace_state, |
b83266a0 | 1207 | sizeof (ptrace_state)); |
c906108c SS |
1208 | if (errno) |
1209 | perror_with_name ("ptrace"); | |
1210 | if (pt_status < 0) | |
1211 | return 0; | |
1212 | ||
1213 | if (ptrace_state.pe_report_event & PTRACE_FORK) | |
1214 | { | |
1215 | *childpid = ptrace_state.pe_other_pid; | |
1216 | return 1; | |
1217 | } | |
1218 | ||
1219 | return 0; | |
1220 | #endif | |
1221 | } | |
1222 | ||
1223 | int | |
47932f85 | 1224 | hpux_has_vforked (int pid, int *childpid) |
c906108c SS |
1225 | { |
1226 | /* This request is only available on HPUX 10.0 and later. */ | |
1227 | #if !defined(PT_GET_PROCESS_STATE) | |
1228 | *childpid = 0; | |
1229 | return 0; | |
1230 | ||
1231 | #else | |
1232 | int pt_status; | |
c5aa993b | 1233 | ptrace_state_t ptrace_state; |
c906108c SS |
1234 | |
1235 | errno = 0; | |
1236 | pt_status = call_ptrace (PT_GET_PROCESS_STATE, | |
b83266a0 | 1237 | pid, |
c5aa993b | 1238 | (PTRACE_ARG3_TYPE) & ptrace_state, |
b83266a0 | 1239 | sizeof (ptrace_state)); |
c906108c SS |
1240 | if (errno) |
1241 | perror_with_name ("ptrace"); | |
1242 | if (pt_status < 0) | |
1243 | return 0; | |
1244 | ||
1245 | if (ptrace_state.pe_report_event & PTRACE_VFORK) | |
1246 | { | |
1247 | *childpid = ptrace_state.pe_other_pid; | |
1248 | return 1; | |
1249 | } | |
1250 | ||
1251 | return 0; | |
1252 | #endif | |
1253 | } | |
1254 | ||
c906108c | 1255 | int |
fba45db2 | 1256 | child_insert_exec_catchpoint (int pid) |
c906108c | 1257 | { |
b83266a0 | 1258 | /* This request is only available on HPUX 10.0 and later. */ |
c906108c SS |
1259 | #if !defined(PT_SET_EVENT_MASK) |
1260 | error ("Unable to catch execs prior to HPUX 10.0"); | |
1261 | ||
1262 | #else | |
b83266a0 | 1263 | /* Enable reporting of exec events from the kernel. */ |
c906108c | 1264 | /* ??rehrauer: For the moment, we're always enabling these events, |
b83266a0 | 1265 | and just ignoring them if there's no catchpoint to catch them. */ |
c906108c SS |
1266 | return 0; |
1267 | #endif | |
1268 | } | |
1269 | ||
1270 | int | |
fba45db2 | 1271 | child_remove_exec_catchpoint (int pid) |
c906108c | 1272 | { |
b83266a0 | 1273 | /* This request is only available on HPUX 10.0 and later. */ |
c906108c SS |
1274 | #if !defined(PT_SET_EVENT_MASK) |
1275 | error ("Unable to catch execs prior to HPUX 10.0"); | |
1276 | ||
1277 | #else | |
1278 | /* Disable reporting of exec events from the kernel. */ | |
1279 | /* ??rehrauer: For the moment, we're always enabling these events, | |
b83266a0 | 1280 | and just ignoring them if there's no catchpoint to catch them. */ |
c906108c SS |
1281 | return 0; |
1282 | #endif | |
1283 | } | |
1284 | ||
1285 | int | |
47932f85 | 1286 | hpux_has_execd (int pid, char **execd_pathname) |
c906108c | 1287 | { |
b83266a0 | 1288 | /* This request is only available on HPUX 10.0 and later. */ |
c906108c SS |
1289 | #if !defined(PT_GET_PROCESS_STATE) |
1290 | *execd_pathname = NULL; | |
1291 | return 0; | |
1292 | ||
1293 | #else | |
1294 | int pt_status; | |
c5aa993b | 1295 | ptrace_state_t ptrace_state; |
c906108c SS |
1296 | |
1297 | errno = 0; | |
1298 | pt_status = call_ptrace (PT_GET_PROCESS_STATE, | |
b83266a0 | 1299 | pid, |
c5aa993b | 1300 | (PTRACE_ARG3_TYPE) & ptrace_state, |
b83266a0 | 1301 | sizeof (ptrace_state)); |
c906108c SS |
1302 | if (errno) |
1303 | perror_with_name ("ptrace"); | |
1304 | if (pt_status < 0) | |
1305 | return 0; | |
1306 | ||
1307 | if (ptrace_state.pe_report_event & PTRACE_EXEC) | |
1308 | { | |
c5aa993b | 1309 | char *exec_file = target_pid_to_exec_file (pid); |
c906108c SS |
1310 | *execd_pathname = savestring (exec_file, strlen (exec_file)); |
1311 | return 1; | |
1312 | } | |
1313 | ||
1314 | return 0; | |
1315 | #endif | |
1316 | } | |
1317 | ||
1318 | int | |
fba45db2 | 1319 | child_reported_exec_events_per_exec_call (void) |
c906108c | 1320 | { |
c5aa993b | 1321 | return 2; /* ptrace reports the event twice per call. */ |
c906108c SS |
1322 | } |
1323 | ||
1324 | int | |
47932f85 | 1325 | hpux_has_syscall_event (int pid, enum target_waitkind *kind, int *syscall_id) |
c906108c SS |
1326 | { |
1327 | /* This request is only available on HPUX 10.30 and later, via | |
1328 | the ttrace interface. */ | |
1329 | ||
1330 | *kind = TARGET_WAITKIND_SPURIOUS; | |
1331 | *syscall_id = -1; | |
1332 | return 0; | |
1333 | } | |
1334 | ||
1335 | char * | |
fba45db2 | 1336 | child_pid_to_exec_file (int pid) |
c906108c | 1337 | { |
b83266a0 | 1338 | static char exec_file_buffer[1024]; |
c906108c | 1339 | int pt_status; |
b83266a0 SS |
1340 | CORE_ADDR top_of_stack; |
1341 | char four_chars[4]; | |
c906108c SS |
1342 | int name_index; |
1343 | int i; | |
39f77062 | 1344 | ptid_t saved_inferior_ptid; |
52287340 | 1345 | int done; |
c5aa993b | 1346 | |
c906108c SS |
1347 | #ifdef PT_GET_PROCESS_PATHNAME |
1348 | /* As of 10.x HP-UX, there's an explicit request to get the pathname. */ | |
1349 | pt_status = call_ptrace (PT_GET_PROCESS_PATHNAME, | |
b83266a0 SS |
1350 | pid, |
1351 | (PTRACE_ARG3_TYPE) exec_file_buffer, | |
1352 | sizeof (exec_file_buffer) - 1); | |
c906108c SS |
1353 | if (pt_status == 0) |
1354 | return exec_file_buffer; | |
1355 | #endif | |
1356 | ||
1357 | /* It appears that this request is broken prior to 10.30. | |
1358 | If it fails, try a really, truly amazingly gross hack | |
1359 | that DDE uses, of pawing through the process' data | |
1360 | segment to find the pathname. */ | |
1361 | ||
1362 | top_of_stack = 0x7b03a000; | |
1363 | name_index = 0; | |
1364 | done = 0; | |
1365 | ||
39f77062 KB |
1366 | /* On the chance that pid != inferior_ptid, set inferior_ptid |
1367 | to pid, so that (grrrr!) implicit uses of inferior_ptid get | |
c906108c SS |
1368 | the right id. */ |
1369 | ||
39f77062 KB |
1370 | saved_inferior_ptid = inferior_ptid; |
1371 | inferior_ptid = pid_to_ptid (pid); | |
c906108c SS |
1372 | |
1373 | /* Try to grab a null-terminated string. */ | |
c5aa993b | 1374 | while (!done) |
c906108c SS |
1375 | { |
1376 | if (target_read_memory (top_of_stack, four_chars, 4) != 0) | |
1377 | { | |
39f77062 | 1378 | inferior_ptid = saved_inferior_ptid; |
c906108c SS |
1379 | return NULL; |
1380 | } | |
1381 | for (i = 0; i < 4; i++) | |
1382 | { | |
1383 | exec_file_buffer[name_index++] = four_chars[i]; | |
1384 | done = (four_chars[i] == '\0'); | |
1385 | if (done) | |
1386 | break; | |
1387 | } | |
1388 | top_of_stack += 4; | |
1389 | } | |
1390 | ||
1391 | if (exec_file_buffer[0] == '\0') | |
1392 | { | |
39f77062 | 1393 | inferior_ptid = saved_inferior_ptid; |
c906108c SS |
1394 | return NULL; |
1395 | } | |
1396 | ||
39f77062 | 1397 | inferior_ptid = saved_inferior_ptid; |
c906108c SS |
1398 | return exec_file_buffer; |
1399 | } | |
1400 | ||
1401 | void | |
fba45db2 | 1402 | pre_fork_inferior (void) |
c906108c SS |
1403 | { |
1404 | int status; | |
1405 | ||
1406 | status = pipe (startup_semaphore.parent_channel); | |
1407 | if (status < 0) | |
1408 | { | |
1409 | warning ("error getting parent pipe for startup semaphore"); | |
1410 | return; | |
1411 | } | |
1412 | ||
1413 | status = pipe (startup_semaphore.child_channel); | |
1414 | if (status < 0) | |
1415 | { | |
1416 | warning ("error getting child pipe for startup semaphore"); | |
1417 | return; | |
1418 | } | |
1419 | } | |
c906108c | 1420 | \f |
c5aa993b | 1421 | |
c906108c SS |
1422 | /* Check to see if the given thread is alive. |
1423 | ||
1424 | This is a no-op, as ptrace doesn't support threads, so we just | |
1425 | return "TRUE". */ | |
1426 | ||
1427 | int | |
39f77062 | 1428 | child_thread_alive (ptid_t ptid) |
c906108c | 1429 | { |
c5aa993b | 1430 | return 1; |
c906108c SS |
1431 | } |
1432 | ||
1433 | #endif /* ! GDB_NATIVE_HPUX_11 */ |