Commit | Line | Data |
---|---|---|
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" |
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; | |
12c266ea | 98 | len = DEPRECATED_REGISTER_RAW_SIZE (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 | |
12c266ea AC |
109 | DEPRECATED_REGISTER_RAW_SIZE(0) says. Assuming all HP-UX |
110 | PA machines are big-endian, put it at the least | |
111 | significant end of the value, and zap the rest of the | |
112 | buffer. */ | |
113 | offset = DEPRECATED_REGISTER_RAW_SIZE (0) - len; | |
7be570e7 JM |
114 | } |
115 | ||
116 | /* Floating-point registers come from the ss_fpblock area. */ | |
34f75cc1 | 117 | else if (regno >= HPPA_FP0_REGNUM) |
7be570e7 | 118 | addr = (HPPAH_OFFSETOF (save_state_t, ss_fpblock) |
34f75cc1 | 119 | + (DEPRECATED_REGISTER_BYTE (regno) - DEPRECATED_REGISTER_BYTE (HPPA_FP0_REGNUM))); |
7be570e7 JM |
120 | |
121 | /* Wide registers come from the ss_wide area. | |
122 | I think it's more PC to test (ss_flags & SS_WIDEREGS) to select | |
123 | between ss_wide and ss_narrow than to use the raw register size. | |
124 | But checking ss_flags would require an extra ptrace call for | |
125 | every register reference. Bleah. */ | |
126 | else if (len == 8) | |
127 | addr = (HPPAH_OFFSETOF (save_state_t, ss_wide) | |
62700349 | 128 | + DEPRECATED_REGISTER_BYTE (regno)); |
7be570e7 JM |
129 | |
130 | /* Narrow registers come from the ss_narrow area. Note that | |
131 | ss_narrow starts with gr1, not gr0. */ | |
132 | else if (len == 4) | |
133 | addr = (HPPAH_OFFSETOF (save_state_t, ss_narrow) | |
62700349 | 134 | + (DEPRECATED_REGISTER_BYTE (regno) - DEPRECATED_REGISTER_BYTE (1))); |
7be570e7 | 135 | else |
8e65ff28 AC |
136 | internal_error (__FILE__, __LINE__, |
137 | "hppah-nat.c (write_register): unexpected register size"); | |
7be570e7 JM |
138 | |
139 | #ifdef GDB_TARGET_IS_HPPA_20W | |
140 | /* Unbelieveable. The PC head and tail must be written in 64bit hunks | |
141 | or we will get an error. Worse yet, the oddball ptrace/ttrace | |
142 | layering will not allow us to perform a 64bit register store. | |
143 | ||
144 | What a crock. */ | |
34f75cc1 | 145 | if (regno == HPPA_PCOQ_HEAD_REGNUM || regno == HPPA_PCOQ_TAIL_REGNUM && len == 8) |
7be570e7 JM |
146 | { |
147 | CORE_ADDR temp; | |
148 | ||
62700349 | 149 | temp = *(CORE_ADDR *)&deprecated_registers[DEPRECATED_REGISTER_BYTE (regno)]; |
7be570e7 JM |
150 | |
151 | /* Set the priv level (stored in the low two bits of the PC. */ | |
152 | temp |= 0x3; | |
153 | ||
39f77062 KB |
154 | ttrace_write_reg_64 (PIDGET (inferior_ptid), (CORE_ADDR)addr, |
155 | (CORE_ADDR)&temp); | |
7be570e7 JM |
156 | |
157 | /* If we fail to write the PC, give a true error instead of | |
158 | just a warning. */ | |
b83266a0 SS |
159 | if (errno != 0) |
160 | { | |
7be570e7 JM |
161 | char *err = safe_strerror (errno); |
162 | char *msg = alloca (strlen (err) + 128); | |
163 | sprintf (msg, "writing `%s' register: %s", | |
164 | REGISTER_NAME (regno), err); | |
165 | perror_with_name (msg); | |
b83266a0 | 166 | } |
7be570e7 | 167 | return; |
b83266a0 | 168 | } |
53a5351d JM |
169 | |
170 | /* Another crock. HPUX complains if you write a nonzero value to | |
171 | the high part of IPSW. What will it take for HP to catch a | |
172 | clue about building sensible interfaces? */ | |
34f75cc1 | 173 | if (regno == HPPA_IPSW_REGNUM && len == 8) |
62700349 | 174 | *(int *)&deprecated_registers[DEPRECATED_REGISTER_BYTE (regno)] = 0; |
7be570e7 JM |
175 | #endif |
176 | ||
177 | for (i = 0; i < len; i += sizeof (int)) | |
178 | { | |
179 | errno = 0; | |
39f77062 KB |
180 | call_ptrace (PT_WUREGS, PIDGET (inferior_ptid), |
181 | (PTRACE_ARG3_TYPE) addr + i, | |
62700349 | 182 | *(int *) &deprecated_registers[DEPRECATED_REGISTER_BYTE (regno) + i]); |
7be570e7 JM |
183 | if (errno != 0) |
184 | { | |
185 | /* Warning, not error, in case we are attached; sometimes | |
186 | the kernel doesn't let us at the registers. */ | |
187 | char *err = safe_strerror (errno); | |
188 | char *msg = alloca (strlen (err) + 128); | |
53a5351d | 189 | sprintf (msg, "writing `%s' register: %s", |
7be570e7 JM |
190 | REGISTER_NAME (regno), err); |
191 | /* If we fail to write the PC, give a true error instead of | |
192 | just a warning. */ | |
34f75cc1 | 193 | if (regno == HPPA_PCOQ_HEAD_REGNUM || regno == HPPA_PCOQ_TAIL_REGNUM) |
7be570e7 JM |
194 | perror_with_name (msg); |
195 | else | |
c906108c | 196 | warning (msg); |
7be570e7 JM |
197 | return; |
198 | } | |
199 | } | |
c906108c SS |
200 | } |
201 | else | |
202 | for (regno = 0; regno < NUM_REGS; regno++) | |
203 | store_inferior_registers (regno); | |
204 | } | |
205 | ||
c906108c | 206 | |
adf40b2e | 207 | /* Fetch a register's value from the process's U area. */ |
c906108c | 208 | static void |
fba45db2 | 209 | fetch_register (int regno) |
c906108c | 210 | { |
123a958e | 211 | char buf[MAX_REGISTER_SIZE]; |
adf40b2e JM |
212 | unsigned int addr, len, offset; |
213 | int i; | |
c906108c | 214 | |
adf40b2e | 215 | offset = 0; |
12c266ea | 216 | len = DEPRECATED_REGISTER_RAW_SIZE (regno); |
adf40b2e JM |
217 | |
218 | /* Requests for register zero actually want the save_state's | |
219 | ss_flags member. As RM says: "Oh, what a hack!" */ | |
220 | if (regno == 0) | |
221 | { | |
222 | save_state_t ss; | |
223 | addr = HPPAH_OFFSETOF (save_state_t, ss_flags); | |
224 | len = sizeof (ss.ss_flags); | |
225 | ||
226 | /* Note that ss_flags is always an int, no matter what | |
12c266ea AC |
227 | DEPRECATED_REGISTER_RAW_SIZE(0) says. Assuming all HP-UX PA |
228 | machines are big-endian, put it at the least significant end | |
229 | of the value, and zap the rest of the buffer. */ | |
230 | offset = DEPRECATED_REGISTER_RAW_SIZE (0) - len; | |
adf40b2e JM |
231 | memset (buf, 0, sizeof (buf)); |
232 | } | |
c906108c | 233 | |
adf40b2e | 234 | /* Floating-point registers come from the ss_fpblock area. */ |
34f75cc1 | 235 | else if (regno >= HPPA_FP0_REGNUM) |
adf40b2e | 236 | addr = (HPPAH_OFFSETOF (save_state_t, ss_fpblock) |
34f75cc1 | 237 | + (DEPRECATED_REGISTER_BYTE (regno) - DEPRECATED_REGISTER_BYTE (HPPA_FP0_REGNUM))); |
adf40b2e JM |
238 | |
239 | /* Wide registers come from the ss_wide area. | |
240 | I think it's more PC to test (ss_flags & SS_WIDEREGS) to select | |
241 | between ss_wide and ss_narrow than to use the raw register size. | |
242 | But checking ss_flags would require an extra ptrace call for | |
243 | every register reference. Bleah. */ | |
244 | else if (len == 8) | |
245 | addr = (HPPAH_OFFSETOF (save_state_t, ss_wide) | |
62700349 | 246 | + DEPRECATED_REGISTER_BYTE (regno)); |
adf40b2e JM |
247 | |
248 | /* Narrow registers come from the ss_narrow area. Note that | |
249 | ss_narrow starts with gr1, not gr0. */ | |
250 | else if (len == 4) | |
251 | addr = (HPPAH_OFFSETOF (save_state_t, ss_narrow) | |
62700349 | 252 | + (DEPRECATED_REGISTER_BYTE (regno) - DEPRECATED_REGISTER_BYTE (1))); |
c906108c | 253 | |
adf40b2e | 254 | else |
8e65ff28 AC |
255 | internal_error (__FILE__, __LINE__, |
256 | "hppa-nat.c (fetch_register): unexpected register size"); | |
adf40b2e JM |
257 | |
258 | for (i = 0; i < len; i += sizeof (int)) | |
c906108c SS |
259 | { |
260 | errno = 0; | |
adf40b2e JM |
261 | /* Copy an int from the U area to buf. Fill the least |
262 | significant end if len != raw_size. */ | |
263 | * (int *) &buf[offset + i] = | |
39f77062 | 264 | call_ptrace (PT_RUREGS, PIDGET (inferior_ptid), |
adf40b2e | 265 | (PTRACE_ARG3_TYPE) addr + i, 0); |
c906108c SS |
266 | if (errno != 0) |
267 | { | |
adf40b2e JM |
268 | /* Warning, not error, in case we are attached; sometimes |
269 | the kernel doesn't let us at the registers. */ | |
c906108c SS |
270 | char *err = safe_strerror (errno); |
271 | char *msg = alloca (strlen (err) + 128); | |
adf40b2e JM |
272 | sprintf (msg, "reading `%s' register: %s", |
273 | REGISTER_NAME (regno), err); | |
c906108c | 274 | warning (msg); |
adf40b2e | 275 | return; |
c906108c SS |
276 | } |
277 | } | |
adf40b2e JM |
278 | |
279 | /* If we're reading an address from the instruction address queue, | |
280 | mask out the bottom two bits --- they contain the privilege | |
281 | level. */ | |
34f75cc1 | 282 | if (regno == HPPA_PCOQ_HEAD_REGNUM || regno == HPPA_PCOQ_TAIL_REGNUM) |
adf40b2e JM |
283 | buf[len - 1] &= ~0x3; |
284 | ||
c906108c | 285 | supply_register (regno, buf); |
c906108c SS |
286 | } |
287 | ||
adf40b2e | 288 | |
c906108c SS |
289 | /* Copy LEN bytes to or from inferior's memory starting at MEMADDR |
290 | to debugger memory starting at MYADDR. Copy to inferior if | |
291 | WRITE is nonzero. | |
c5aa993b | 292 | |
c906108c SS |
293 | Returns the length copied, which is either the LEN argument or zero. |
294 | This xfer function does not do partial moves, since child_ops | |
295 | doesn't allow memory operations to cross below us in the target stack | |
8fef05cc | 296 | anyway. TARGET is ignored. */ |
c906108c SS |
297 | |
298 | int | |
8fef05cc | 299 | child_xfer_memory (CORE_ADDR memaddr, char *myaddr, int len, int write, |
240be855 | 300 | struct mem_attrib *mem, |
8fef05cc | 301 | struct target_ops *target) |
c906108c | 302 | { |
52f0bd74 | 303 | int i; |
c906108c | 304 | /* Round starting address down to longword boundary. */ |
52f0bd74 | 305 | CORE_ADDR addr = memaddr & - (CORE_ADDR)(sizeof (int)); |
c906108c | 306 | /* Round ending address up; get number of longwords that makes. */ |
52f0bd74 | 307 | int count |
c5aa993b | 308 | = (((memaddr + len) - addr) + sizeof (int) - 1) / sizeof (int); |
c906108c | 309 | |
b83266a0 SS |
310 | /* Allocate buffer of that many longwords. |
311 | Note -- do not use alloca to allocate this buffer since there is no | |
312 | guarantee of when the buffer will actually be deallocated. | |
313 | ||
314 | This routine can be called over and over with the same call chain; | |
315 | this (in effect) would pile up all those alloca requests until a call | |
316 | to alloca was made from a point higher than this routine in the | |
317 | call chain. */ | |
52f0bd74 | 318 | int *buffer = (int *) xmalloc (count * sizeof (int)); |
c906108c SS |
319 | |
320 | if (write) | |
321 | { | |
322 | /* Fill start and end extra bytes of buffer with existing memory data. */ | |
c5aa993b | 323 | if (addr != memaddr || len < (int) sizeof (int)) |
b83266a0 SS |
324 | { |
325 | /* Need part of initial word -- fetch it. */ | |
c5aa993b | 326 | buffer[0] = call_ptrace (addr < text_end ? PT_RIUSER : PT_RDUSER, |
39f77062 KB |
327 | PIDGET (inferior_ptid), |
328 | (PTRACE_ARG3_TYPE) addr, 0); | |
b83266a0 | 329 | } |
c906108c SS |
330 | |
331 | if (count > 1) /* FIXME, avoid if even boundary */ | |
332 | { | |
333 | buffer[count - 1] | |
b83266a0 | 334 | = call_ptrace (addr < text_end ? PT_RIUSER : PT_RDUSER, |
39f77062 | 335 | PIDGET (inferior_ptid), |
b83266a0 SS |
336 | (PTRACE_ARG3_TYPE) (addr |
337 | + (count - 1) * sizeof (int)), | |
338 | 0); | |
c906108c SS |
339 | } |
340 | ||
341 | /* Copy data to be written over corresponding part of buffer */ | |
c906108c SS |
342 | memcpy ((char *) buffer + (memaddr & (sizeof (int) - 1)), myaddr, len); |
343 | ||
344 | /* Write the entire buffer. */ | |
c906108c SS |
345 | for (i = 0; i < count; i++, addr += sizeof (int)) |
346 | { | |
b83266a0 SS |
347 | int pt_status; |
348 | int pt_request; | |
349 | /* The HP-UX kernel crashes if you use PT_WDUSER to write into the | |
350 | text segment. FIXME -- does it work to write into the data | |
351 | segment using WIUSER, or do these idiots really expect us to | |
352 | figure out which segment the address is in, so we can use a | |
353 | separate system call for it??! */ | |
c906108c | 354 | errno = 0; |
b83266a0 | 355 | pt_request = (addr < text_end) ? PT_WIUSER : PT_WDUSER; |
c906108c | 356 | pt_status = call_ptrace (pt_request, |
39f77062 | 357 | PIDGET (inferior_ptid), |
b83266a0 SS |
358 | (PTRACE_ARG3_TYPE) addr, |
359 | buffer[i]); | |
360 | ||
361 | /* Did we fail? Might we've guessed wrong about which | |
362 | segment this address resides in? Try the other request, | |
363 | and see if that works... */ | |
364 | if ((pt_status == -1) && errno) | |
365 | { | |
366 | errno = 0; | |
367 | pt_request = (pt_request == PT_WIUSER) ? PT_WDUSER : PT_WIUSER; | |
368 | pt_status = call_ptrace (pt_request, | |
39f77062 | 369 | PIDGET (inferior_ptid), |
b83266a0 SS |
370 | (PTRACE_ARG3_TYPE) addr, |
371 | buffer[i]); | |
372 | ||
373 | /* No, we still fail. Okay, time to punt. */ | |
374 | if ((pt_status == -1) && errno) | |
375 | { | |
b8c9b27d | 376 | xfree (buffer); |
b83266a0 SS |
377 | return 0; |
378 | } | |
379 | } | |
c906108c SS |
380 | } |
381 | } | |
382 | else | |
383 | { | |
384 | /* Read all the longwords */ | |
385 | for (i = 0; i < count; i++, addr += sizeof (int)) | |
386 | { | |
387 | errno = 0; | |
c5aa993b | 388 | buffer[i] = call_ptrace (addr < text_end ? PT_RIUSER : PT_RDUSER, |
39f77062 KB |
389 | PIDGET (inferior_ptid), |
390 | (PTRACE_ARG3_TYPE) addr, 0); | |
b83266a0 SS |
391 | if (errno) |
392 | { | |
b8c9b27d | 393 | xfree (buffer); |
b83266a0 SS |
394 | return 0; |
395 | } | |
c906108c SS |
396 | QUIT; |
397 | } | |
398 | ||
399 | /* Copy appropriate bytes out of the buffer. */ | |
400 | memcpy (myaddr, (char *) buffer + (memaddr & (sizeof (int) - 1)), len); | |
401 | } | |
b8c9b27d | 402 | xfree (buffer); |
c906108c SS |
403 | return len; |
404 | } | |
405 | ||
7d2830a3 | 406 | char *saved_child_execd_pathname = NULL; |
6604731b | 407 | int saved_vfork_pid; |
7d2830a3 DJ |
408 | enum { |
409 | STATE_NONE, | |
410 | STATE_GOT_CHILD, | |
411 | STATE_GOT_EXEC, | |
412 | STATE_GOT_PARENT, | |
413 | STATE_FAKE_EXEC | |
414 | } saved_vfork_state = STATE_NONE; | |
c906108c | 415 | |
6604731b DJ |
416 | int |
417 | child_follow_fork (int follow_child) | |
c906108c | 418 | { |
6604731b DJ |
419 | ptid_t last_ptid; |
420 | struct target_waitstatus last_status; | |
421 | int has_vforked; | |
422 | int parent_pid, child_pid; | |
423 | ||
424 | get_last_target_status (&last_ptid, &last_status); | |
425 | has_vforked = (last_status.kind == TARGET_WAITKIND_VFORKED); | |
426 | parent_pid = ptid_get_pid (last_ptid); | |
427 | child_pid = last_status.value.related_pid; | |
428 | ||
429 | /* At this point, if we are vforking, breakpoints were already | |
430 | detached from the child in child_wait; and the child has already | |
431 | called execve(). If we are forking, both the parent and child | |
432 | have breakpoints inserted. */ | |
433 | ||
434 | if (! follow_child) | |
c906108c | 435 | { |
6604731b DJ |
436 | if (! has_vforked) |
437 | { | |
438 | detach_breakpoints (child_pid); | |
439 | #ifdef SOLIB_REMOVE_INFERIOR_HOOK | |
440 | SOLIB_REMOVE_INFERIOR_HOOK (child_pid); | |
441 | #endif | |
442 | } | |
443 | ||
444 | /* Detach from the child. */ | |
4c9ba7e0 DJ |
445 | printf_unfiltered ("Detaching after fork from %s\n", |
446 | target_pid_to_str (pid_to_ptid (child_pid))); | |
447 | hppa_require_detach (child_pid, 0); | |
6604731b DJ |
448 | |
449 | /* The parent and child of a vfork share the same address space. | |
450 | Also, on some targets the order in which vfork and exec events | |
451 | are received for parent in child requires some delicate handling | |
452 | of the events. | |
453 | ||
454 | For instance, on ptrace-based HPUX we receive the child's vfork | |
455 | event first, at which time the parent has been suspended by the | |
456 | OS and is essentially untouchable until the child's exit or second | |
457 | exec event arrives. At that time, the parent's vfork event is | |
458 | delivered to us, and that's when we see and decide how to follow | |
459 | the vfork. But to get to that point, we must continue the child | |
460 | until it execs or exits. To do that smoothly, all breakpoints | |
461 | must be removed from the child, in case there are any set between | |
462 | the vfork() and exec() calls. But removing them from the child | |
463 | also removes them from the parent, due to the shared-address-space | |
464 | nature of a vfork'd parent and child. On HPUX, therefore, we must | |
465 | take care to restore the bp's to the parent before we continue it. | |
466 | Else, it's likely that we may not stop in the expected place. (The | |
467 | worst scenario is when the user tries to step over a vfork() call; | |
468 | the step-resume bp must be restored for the step to properly stop | |
469 | in the parent after the call completes!) | |
470 | ||
471 | Sequence of events, as reported to gdb from HPUX: | |
472 | ||
473 | Parent Child Action for gdb to take | |
474 | ------------------------------------------------------- | |
475 | 1 VFORK Continue child | |
476 | 2 EXEC | |
477 | 3 EXEC or EXIT | |
478 | 4 VFORK | |
479 | ||
480 | Now that the child has safely exec'd or exited, we must restore | |
481 | the parent's breakpoints before we continue it. Else, we may | |
482 | cause it run past expected stopping points. */ | |
483 | ||
484 | if (has_vforked) | |
485 | reattach_breakpoints (parent_pid); | |
c906108c | 486 | } |
6604731b DJ |
487 | else |
488 | { | |
6604731b DJ |
489 | /* Needed to keep the breakpoint lists in sync. */ |
490 | if (! has_vforked) | |
491 | detach_breakpoints (child_pid); | |
7d2830a3 | 492 | |
6604731b DJ |
493 | /* Before detaching from the parent, remove all breakpoints from it. */ |
494 | remove_breakpoints (); | |
495 | ||
496 | /* Also reset the solib inferior hook from the parent. */ | |
497 | #ifdef SOLIB_REMOVE_INFERIOR_HOOK | |
498 | SOLIB_REMOVE_INFERIOR_HOOK (PIDGET (inferior_ptid)); | |
499 | #endif | |
7d2830a3 | 500 | |
6604731b DJ |
501 | /* Detach from the parent. */ |
502 | target_detach (NULL, 1); | |
503 | ||
504 | /* Attach to the child. */ | |
4c9ba7e0 DJ |
505 | printf_unfiltered ("Attaching after fork to %s\n", |
506 | target_pid_to_str (pid_to_ptid (child_pid))); | |
507 | hppa_require_attach (child_pid); | |
6604731b | 508 | inferior_ptid = pid_to_ptid (child_pid); |
6604731b DJ |
509 | |
510 | /* If we vforked, then we've also execed by now. The exec will be | |
511 | reported momentarily. follow_exec () will handle breakpoints, so | |
512 | we don't have to.. */ | |
513 | if (!has_vforked) | |
514 | follow_inferior_reset_breakpoints (); | |
515 | } | |
516 | ||
517 | if (has_vforked) | |
c906108c | 518 | { |
6604731b DJ |
519 | /* If we followed the parent, don't try to follow the child's exec. */ |
520 | if (saved_vfork_state != STATE_GOT_PARENT | |
521 | && saved_vfork_state != STATE_FAKE_EXEC) | |
522 | fprintf_unfiltered (gdb_stdout, | |
523 | "hppa: post follow vfork: confused state\n"); | |
524 | ||
525 | if (! follow_child || saved_vfork_state == STATE_GOT_PARENT) | |
526 | saved_vfork_state = STATE_NONE; | |
527 | else | |
528 | return 1; | |
c906108c | 529 | } |
6604731b | 530 | return 0; |
c906108c SS |
531 | } |
532 | ||
b83266a0 SS |
533 | /* Format a process id, given PID. Be sure to terminate |
534 | this with a null--it's going to be printed via a "%s". */ | |
c906108c | 535 | char * |
39f77062 | 536 | child_pid_to_str (ptid_t ptid) |
c906108c | 537 | { |
c5aa993b JM |
538 | /* Static because address returned */ |
539 | static char buf[30]; | |
39f77062 | 540 | pid_t pid = PIDGET (ptid); |
c906108c | 541 | |
ce414844 AC |
542 | /* Extra NUL for paranoia's sake */ |
543 | sprintf (buf, "process %d%c", pid, '\0'); | |
c5aa993b JM |
544 | |
545 | return buf; | |
c906108c SS |
546 | } |
547 | ||
b83266a0 SS |
548 | /* Format a thread id, given TID. Be sure to terminate |
549 | this with a null--it's going to be printed via a "%s". | |
550 | ||
551 | Note: This is a core-gdb tid, not the actual system tid. | |
c5aa993b | 552 | See infttrace.c for details. */ |
c906108c | 553 | char * |
39f77062 | 554 | hppa_tid_to_str (ptid_t ptid) |
c906108c | 555 | { |
c5aa993b JM |
556 | /* Static because address returned */ |
557 | static char buf[30]; | |
39f77062 KB |
558 | /* This seems strange, but when I did the ptid conversion, it looked |
559 | as though a pid was always being passed. - Kevin Buettner */ | |
560 | pid_t tid = PIDGET (ptid); | |
c5aa993b JM |
561 | |
562 | /* Extra NULLs for paranoia's sake */ | |
ce414844 | 563 | sprintf (buf, "system thread %d%c", tid, '\0'); |
c906108c | 564 | |
c5aa993b | 565 | return buf; |
c906108c SS |
566 | } |
567 | ||
47932f85 DJ |
568 | /*## */ |
569 | /* Enable HACK for ttrace work. In | |
570 | * infttrace.c/require_notification_of_events, | |
571 | * this is set to 0 so that the loop in child_wait | |
572 | * won't loop. | |
573 | */ | |
574 | int not_same_real_pid = 1; | |
575 | /*## */ | |
576 | ||
47932f85 DJ |
577 | /* Wait for child to do something. Return pid of child, or -1 in case |
578 | of error; store status through argument pointer OURSTATUS. */ | |
579 | ||
580 | ptid_t | |
581 | child_wait (ptid_t ptid, struct target_waitstatus *ourstatus) | |
582 | { | |
583 | int save_errno; | |
584 | int status; | |
585 | char *execd_pathname = NULL; | |
586 | int exit_status; | |
587 | int related_pid; | |
588 | int syscall_id; | |
589 | enum target_waitkind kind; | |
590 | int pid; | |
591 | ||
7d2830a3 DJ |
592 | if (saved_vfork_state == STATE_FAKE_EXEC) |
593 | { | |
594 | saved_vfork_state = STATE_NONE; | |
595 | ourstatus->kind = TARGET_WAITKIND_EXECD; | |
596 | ourstatus->value.execd_pathname = saved_child_execd_pathname; | |
597 | return inferior_ptid; | |
598 | } | |
599 | ||
47932f85 DJ |
600 | do |
601 | { | |
602 | set_sigint_trap (); /* Causes SIGINT to be passed on to the | |
603 | attached process. */ | |
604 | set_sigio_trap (); | |
605 | ||
606 | pid = ptrace_wait (inferior_ptid, &status); | |
607 | ||
608 | save_errno = errno; | |
609 | ||
610 | clear_sigio_trap (); | |
611 | ||
612 | clear_sigint_trap (); | |
613 | ||
614 | if (pid == -1) | |
615 | { | |
616 | if (save_errno == EINTR) | |
617 | continue; | |
618 | ||
619 | fprintf_unfiltered (gdb_stderr, "Child process unexpectedly missing: %s.\n", | |
620 | safe_strerror (save_errno)); | |
621 | ||
622 | /* Claim it exited with unknown signal. */ | |
623 | ourstatus->kind = TARGET_WAITKIND_SIGNALLED; | |
624 | ourstatus->value.sig = TARGET_SIGNAL_UNKNOWN; | |
625 | return pid_to_ptid (-1); | |
626 | } | |
627 | ||
628 | /* Did it exit? | |
629 | */ | |
630 | if (target_has_exited (pid, status, &exit_status)) | |
631 | { | |
632 | /* ??rehrauer: For now, ignore this. */ | |
633 | continue; | |
634 | } | |
635 | ||
636 | if (!target_thread_alive (pid_to_ptid (pid))) | |
637 | { | |
638 | ourstatus->kind = TARGET_WAITKIND_SPURIOUS; | |
639 | return pid_to_ptid (pid); | |
640 | } | |
641 | ||
8e7d2c16 | 642 | if (hpux_has_forked (pid, &related_pid)) |
47932f85 | 643 | { |
8e7d2c16 DJ |
644 | /* Ignore the parent's fork event. */ |
645 | if (pid == PIDGET (inferior_ptid)) | |
646 | { | |
647 | ourstatus->kind = TARGET_WAITKIND_IGNORE; | |
648 | return inferior_ptid; | |
649 | } | |
650 | ||
651 | /* If this is the child's fork event, report that the | |
652 | process has forked. */ | |
653 | if (related_pid == PIDGET (inferior_ptid)) | |
654 | { | |
655 | ourstatus->kind = TARGET_WAITKIND_FORKED; | |
656 | ourstatus->value.related_pid = pid; | |
657 | return inferior_ptid; | |
658 | } | |
47932f85 DJ |
659 | } |
660 | ||
7d2830a3 | 661 | if (hpux_has_vforked (pid, &related_pid)) |
47932f85 | 662 | { |
7d2830a3 DJ |
663 | if (pid == PIDGET (inferior_ptid)) |
664 | { | |
665 | if (saved_vfork_state == STATE_GOT_CHILD) | |
666 | saved_vfork_state = STATE_GOT_PARENT; | |
667 | else if (saved_vfork_state == STATE_GOT_EXEC) | |
668 | saved_vfork_state = STATE_FAKE_EXEC; | |
669 | else | |
670 | fprintf_unfiltered (gdb_stdout, | |
671 | "hppah: parent vfork: confused\n"); | |
672 | } | |
673 | else if (related_pid == PIDGET (inferior_ptid)) | |
674 | { | |
675 | if (saved_vfork_state == STATE_NONE) | |
676 | saved_vfork_state = STATE_GOT_CHILD; | |
677 | else | |
678 | fprintf_unfiltered (gdb_stdout, | |
679 | "hppah: child vfork: confused\n"); | |
680 | } | |
681 | else | |
682 | fprintf_unfiltered (gdb_stdout, | |
683 | "hppah: unknown vfork: confused\n"); | |
684 | ||
685 | if (saved_vfork_state == STATE_GOT_CHILD) | |
686 | { | |
687 | child_post_startup_inferior (pid_to_ptid (pid)); | |
6604731b DJ |
688 | detach_breakpoints (pid); |
689 | #ifdef SOLIB_REMOVE_INFERIOR_HOOK | |
690 | SOLIB_REMOVE_INFERIOR_HOOK (pid); | |
691 | #endif | |
692 | child_resume (pid_to_ptid (pid), 0, TARGET_SIGNAL_0); | |
693 | ourstatus->kind = TARGET_WAITKIND_IGNORE; | |
694 | return pid_to_ptid (related_pid); | |
7d2830a3 | 695 | } |
6604731b | 696 | else if (saved_vfork_state == STATE_FAKE_EXEC) |
7d2830a3 DJ |
697 | { |
698 | ourstatus->kind = TARGET_WAITKIND_VFORKED; | |
699 | ourstatus->value.related_pid = related_pid; | |
700 | return pid_to_ptid (pid); | |
701 | } | |
6604731b DJ |
702 | else |
703 | { | |
704 | /* We saw the parent's vfork, but we haven't seen the exec yet. | |
705 | Wait for it, for simplicity's sake. It should be pending. */ | |
706 | saved_vfork_pid = related_pid; | |
707 | ourstatus->kind = TARGET_WAITKIND_IGNORE; | |
708 | return pid_to_ptid (pid); | |
709 | } | |
47932f85 DJ |
710 | } |
711 | ||
712 | if (hpux_has_execd (pid, &execd_pathname)) | |
713 | { | |
7d2830a3 DJ |
714 | /* On HP-UX, events associated with a vforking inferior come in |
715 | threes: a vfork event for the child (always first), followed | |
716 | a vfork event for the parent and an exec event for the child. | |
6604731b DJ |
717 | The latter two can come in either order. Make sure we get |
718 | both. */ | |
719 | if (saved_vfork_state != STATE_NONE) | |
7d2830a3 | 720 | { |
6604731b DJ |
721 | if (saved_vfork_state == STATE_GOT_CHILD) |
722 | { | |
723 | saved_vfork_state = STATE_GOT_EXEC; | |
724 | /* On HP/UX with ptrace, the child must be resumed before | |
725 | the parent vfork event is delivered. A single-step | |
726 | suffices. */ | |
727 | if (RESUME_EXECD_VFORKING_CHILD_TO_GET_PARENT_VFORK ()) | |
728 | target_resume (pid_to_ptid (pid), 1, TARGET_SIGNAL_0); | |
729 | ourstatus->kind = TARGET_WAITKIND_IGNORE; | |
730 | } | |
731 | else if (saved_vfork_state == STATE_GOT_PARENT) | |
732 | { | |
733 | saved_vfork_state = STATE_FAKE_EXEC; | |
734 | ourstatus->kind = TARGET_WAITKIND_VFORKED; | |
735 | ourstatus->value.related_pid = saved_vfork_pid; | |
736 | } | |
737 | else | |
738 | fprintf_unfiltered (gdb_stdout, | |
739 | "hppa: exec: unexpected state\n"); | |
7d2830a3 | 740 | |
6604731b | 741 | saved_child_execd_pathname = execd_pathname; |
7d2830a3 | 742 | |
7d2830a3 DJ |
743 | return inferior_ptid; |
744 | } | |
745 | ||
47932f85 DJ |
746 | /* Are we ignoring initial exec events? (This is likely because |
747 | we're in the process of starting up the inferior, and another | |
748 | (older) mechanism handles those.) If so, we'll report this | |
749 | as a regular stop, not an exec. | |
750 | */ | |
751 | if (inferior_ignoring_startup_exec_events) | |
752 | { | |
753 | inferior_ignoring_startup_exec_events--; | |
754 | } | |
755 | else | |
756 | { | |
757 | ourstatus->kind = TARGET_WAITKIND_EXECD; | |
758 | ourstatus->value.execd_pathname = execd_pathname; | |
759 | return pid_to_ptid (pid); | |
760 | } | |
761 | } | |
762 | ||
763 | /* All we must do with these is communicate their occurrence | |
764 | to wait_for_inferior... | |
765 | */ | |
766 | if (hpux_has_syscall_event (pid, &kind, &syscall_id)) | |
767 | { | |
768 | ourstatus->kind = kind; | |
769 | ourstatus->value.syscall_id = syscall_id; | |
770 | return pid_to_ptid (pid); | |
771 | } | |
772 | ||
773 | /*## } while (pid != PIDGET (inferior_ptid)); ## *//* Some other child died or stopped */ | |
774 | /* hack for thread testing */ | |
775 | } | |
776 | while ((pid != PIDGET (inferior_ptid)) && not_same_real_pid); | |
777 | /*## */ | |
778 | ||
779 | store_waitstatus (ourstatus, status); | |
780 | return pid_to_ptid (pid); | |
781 | } | |
782 | ||
c906108c SS |
783 | #if !defined (GDB_NATIVE_HPUX_11) |
784 | ||
785 | /* The following code is a substitute for the infttrace.c versions used | |
786 | with ttrace() in HPUX 11. */ | |
787 | ||
788 | /* This value is an arbitrary integer. */ | |
789 | #define PT_VERSION 123456 | |
790 | ||
791 | /* This semaphore is used to coordinate the child and parent processes | |
792 | after a fork(), and before an exec() by the child. See | |
793 | parent_attach_all for details. */ | |
794 | ||
c5aa993b JM |
795 | typedef struct |
796 | { | |
797 | int parent_channel[2]; /* Parent "talks" to [1], child "listens" to [0] */ | |
798 | int child_channel[2]; /* Child "talks" to [1], parent "listens" to [0] */ | |
799 | } | |
800 | startup_semaphore_t; | |
c906108c SS |
801 | |
802 | #define SEM_TALK (1) | |
803 | #define SEM_LISTEN (0) | |
804 | ||
c5aa993b | 805 | static startup_semaphore_t startup_semaphore; |
c906108c | 806 | |
c906108c SS |
807 | #ifdef PT_SETTRC |
808 | /* This function causes the caller's process to be traced by its | |
809 | parent. This is intended to be called after GDB forks itself, | |
810 | and before the child execs the target. | |
811 | ||
812 | Note that HP-UX ptrace is rather funky in how this is done. | |
813 | If the parent wants to get the initial exec event of a child, | |
814 | it must set the ptrace event mask of the child to include execs. | |
815 | (The child cannot do this itself.) This must be done after the | |
816 | child is forked, but before it execs. | |
817 | ||
818 | To coordinate the parent and child, we implement a semaphore using | |
819 | pipes. After SETTRC'ing itself, the child tells the parent that | |
820 | it is now traceable by the parent, and waits for the parent's | |
821 | acknowledgement. The parent can then set the child's event mask, | |
822 | and notify the child that it can now exec. | |
823 | ||
824 | (The acknowledgement by parent happens as a result of a call to | |
825 | child_acknowledge_created_inferior.) */ | |
826 | ||
827 | int | |
fba45db2 | 828 | parent_attach_all (int pid, PTRACE_ARG3_TYPE addr, int data) |
c906108c SS |
829 | { |
830 | int pt_status = 0; | |
831 | ||
832 | /* We need a memory home for a constant. */ | |
833 | int tc_magic_child = PT_VERSION; | |
834 | int tc_magic_parent = 0; | |
835 | ||
836 | /* The remainder of this function is only useful for HPUX 10.0 and | |
837 | later, as it depends upon the ability to request notification | |
838 | of specific kinds of events by the kernel. */ | |
839 | #if defined(PT_SET_EVENT_MASK) | |
840 | ||
841 | /* Notify the parent that we're potentially ready to exec(). */ | |
842 | write (startup_semaphore.child_channel[SEM_TALK], | |
b83266a0 SS |
843 | &tc_magic_child, |
844 | sizeof (tc_magic_child)); | |
c906108c SS |
845 | |
846 | /* Wait for acknowledgement from the parent. */ | |
847 | read (startup_semaphore.parent_channel[SEM_LISTEN], | |
b83266a0 SS |
848 | &tc_magic_parent, |
849 | sizeof (tc_magic_parent)); | |
c906108c | 850 | if (tc_magic_child != tc_magic_parent) |
c5aa993b | 851 | warning ("mismatched semaphore magic"); |
c906108c SS |
852 | |
853 | /* Discard our copy of the semaphore. */ | |
854 | (void) close (startup_semaphore.parent_channel[SEM_LISTEN]); | |
855 | (void) close (startup_semaphore.parent_channel[SEM_TALK]); | |
856 | (void) close (startup_semaphore.child_channel[SEM_LISTEN]); | |
857 | (void) close (startup_semaphore.child_channel[SEM_TALK]); | |
858 | #endif | |
c5aa993b | 859 | |
c906108c SS |
860 | return 0; |
861 | } | |
862 | #endif | |
863 | ||
864 | int | |
fba45db2 | 865 | hppa_require_attach (int pid) |
c906108c SS |
866 | { |
867 | int pt_status; | |
b83266a0 SS |
868 | CORE_ADDR pc; |
869 | CORE_ADDR pc_addr; | |
c906108c SS |
870 | unsigned int regs_offset; |
871 | ||
872 | /* Are we already attached? There appears to be no explicit way to | |
873 | answer this via ptrace, so we try something which should be | |
874 | innocuous if we are attached. If that fails, then we assume | |
875 | we're not attached, and so attempt to make it so. */ | |
876 | ||
877 | errno = 0; | |
878 | regs_offset = U_REGS_OFFSET; | |
879 | pc_addr = register_addr (PC_REGNUM, regs_offset); | |
880 | pc = call_ptrace (PT_READ_U, pid, (PTRACE_ARG3_TYPE) pc_addr, 0); | |
881 | ||
882 | if (errno) | |
883 | { | |
884 | errno = 0; | |
885 | pt_status = call_ptrace (PT_ATTACH, pid, (PTRACE_ARG3_TYPE) 0, 0); | |
886 | ||
887 | if (errno) | |
b83266a0 | 888 | return -1; |
c906108c SS |
889 | |
890 | /* Now we really are attached. */ | |
891 | errno = 0; | |
892 | } | |
893 | attach_flag = 1; | |
894 | return pid; | |
895 | } | |
896 | ||
897 | int | |
fba45db2 | 898 | hppa_require_detach (int pid, int signal) |
c906108c SS |
899 | { |
900 | errno = 0; | |
901 | call_ptrace (PT_DETACH, pid, (PTRACE_ARG3_TYPE) 1, signal); | |
c5aa993b | 902 | errno = 0; /* Ignore any errors. */ |
c906108c SS |
903 | return pid; |
904 | } | |
905 | ||
906 | /* Since ptrace doesn't support memory page-protection events, which | |
907 | are used to implement "hardware" watchpoints on HP-UX, these are | |
908 | dummy versions, which perform no useful work. */ | |
909 | ||
910 | void | |
fba45db2 | 911 | hppa_enable_page_protection_events (int pid) |
c906108c SS |
912 | { |
913 | } | |
914 | ||
915 | void | |
fba45db2 | 916 | hppa_disable_page_protection_events (int pid) |
c906108c SS |
917 | { |
918 | } | |
919 | ||
920 | int | |
fba45db2 | 921 | hppa_insert_hw_watchpoint (int pid, CORE_ADDR start, LONGEST len, int type) |
c906108c SS |
922 | { |
923 | error ("Hardware watchpoints not implemented on this platform."); | |
924 | } | |
925 | ||
926 | int | |
65e82032 | 927 | hppa_remove_hw_watchpoint (int pid, CORE_ADDR start, LONGEST len, int type) |
c906108c SS |
928 | { |
929 | error ("Hardware watchpoints not implemented on this platform."); | |
930 | } | |
931 | ||
932 | int | |
65e82032 | 933 | hppa_can_use_hw_watchpoint (int type, int cnt, int ot) |
c906108c SS |
934 | { |
935 | return 0; | |
936 | } | |
937 | ||
938 | int | |
fba45db2 | 939 | hppa_range_profitable_for_hw_watchpoint (int pid, CORE_ADDR start, LONGEST len) |
c906108c SS |
940 | { |
941 | error ("Hardware watchpoints not implemented on this platform."); | |
942 | } | |
943 | ||
944 | char * | |
39f77062 | 945 | hppa_pid_or_tid_to_str (ptid_t id) |
c906108c SS |
946 | { |
947 | /* In the ptrace world, there are only processes. */ | |
ed9a39eb | 948 | return child_pid_to_str (id); |
c906108c SS |
949 | } |
950 | ||
c906108c | 951 | void |
fba45db2 | 952 | hppa_ensure_vforking_parent_remains_stopped (int pid) |
c906108c SS |
953 | { |
954 | /* This assumes that the vforked parent is presently stopped, and | |
955 | that the vforked child has just delivered its first exec event. | |
956 | Calling kill() this way will cause the SIGTRAP to be delivered as | |
957 | soon as the parent is resumed, which happens as soon as the | |
958 | vforked child is resumed. See wait_for_inferior for the use of | |
959 | this function. */ | |
960 | kill (pid, SIGTRAP); | |
961 | } | |
962 | ||
963 | int | |
fba45db2 | 964 | hppa_resume_execd_vforking_child_to_get_parent_vfork (void) |
c906108c | 965 | { |
c5aa993b | 966 | return 1; /* Yes, the child must be resumed. */ |
c906108c SS |
967 | } |
968 | ||
969 | void | |
fba45db2 | 970 | require_notification_of_events (int pid) |
c906108c SS |
971 | { |
972 | #if defined(PT_SET_EVENT_MASK) | |
973 | int pt_status; | |
974 | ptrace_event_t ptrace_events; | |
c2d11a7d JM |
975 | int nsigs; |
976 | int signum; | |
c906108c SS |
977 | |
978 | /* Instruct the kernel as to the set of events we wish to be | |
979 | informed of. (This support does not exist before HPUX 10.0. | |
980 | We'll assume if PT_SET_EVENT_MASK has not been defined by | |
b83266a0 | 981 | <sys/ptrace.h>, then we're being built on pre-10.0.) */ |
c906108c SS |
982 | memset (&ptrace_events, 0, sizeof (ptrace_events)); |
983 | ||
984 | /* Note: By default, all signals are visible to us. If we wish | |
985 | the kernel to keep certain signals hidden from us, we do it | |
986 | by calling sigdelset (ptrace_events.pe_signals, signal) for | |
b83266a0 | 987 | each such signal here, before doing PT_SET_EVENT_MASK. */ |
c2d11a7d JM |
988 | /* RM: The above comment is no longer true. We start with ignoring |
989 | all signals, and then add the ones we are interested in. We could | |
990 | do it the other way: start by looking at all signals and then | |
991 | deleting the ones that we aren't interested in, except that | |
992 | multiple gdb signals may be mapped to the same host signal | |
993 | (eg. TARGET_SIGNAL_IO and TARGET_SIGNAL_POLL both get mapped to | |
994 | signal 22 on HPUX 10.20) We want to be notified if we are | |
995 | interested in either signal. */ | |
996 | sigfillset (&ptrace_events.pe_signals); | |
997 | ||
998 | /* RM: Let's not bother with signals we don't care about */ | |
999 | nsigs = (int) TARGET_SIGNAL_LAST; | |
1000 | for (signum = nsigs; signum > 0; signum--) | |
1001 | { | |
1002 | if ((signal_stop_state (signum)) || | |
1003 | (signal_print_state (signum)) || | |
1004 | (!signal_pass_state (signum))) | |
1005 | { | |
1006 | if (target_signal_to_host_p (signum)) | |
1007 | sigdelset (&ptrace_events.pe_signals, | |
1008 | target_signal_to_host (signum)); | |
1009 | } | |
1010 | } | |
c906108c SS |
1011 | |
1012 | ptrace_events.pe_set_event = 0; | |
1013 | ||
1014 | ptrace_events.pe_set_event |= PTRACE_SIGNAL; | |
1015 | ptrace_events.pe_set_event |= PTRACE_EXEC; | |
1016 | ptrace_events.pe_set_event |= PTRACE_FORK; | |
1017 | ptrace_events.pe_set_event |= PTRACE_VFORK; | |
1018 | /* ??rehrauer: Add this one when we're prepared to catch it... | |
c5aa993b JM |
1019 | ptrace_events.pe_set_event |= PTRACE_EXIT; |
1020 | */ | |
c906108c SS |
1021 | |
1022 | errno = 0; | |
1023 | pt_status = call_ptrace (PT_SET_EVENT_MASK, | |
c5aa993b JM |
1024 | pid, |
1025 | (PTRACE_ARG3_TYPE) & ptrace_events, | |
1026 | sizeof (ptrace_events)); | |
c906108c SS |
1027 | if (errno) |
1028 | perror_with_name ("ptrace"); | |
1029 | if (pt_status < 0) | |
1030 | return; | |
1031 | #endif | |
1032 | } | |
1033 | ||
1034 | void | |
fba45db2 | 1035 | require_notification_of_exec_events (int pid) |
c906108c SS |
1036 | { |
1037 | #if defined(PT_SET_EVENT_MASK) | |
1038 | int pt_status; | |
1039 | ptrace_event_t ptrace_events; | |
1040 | ||
1041 | /* Instruct the kernel as to the set of events we wish to be | |
1042 | informed of. (This support does not exist before HPUX 10.0. | |
1043 | We'll assume if PT_SET_EVENT_MASK has not been defined by | |
b83266a0 | 1044 | <sys/ptrace.h>, then we're being built on pre-10.0.) */ |
c906108c SS |
1045 | memset (&ptrace_events, 0, sizeof (ptrace_events)); |
1046 | ||
1047 | /* Note: By default, all signals are visible to us. If we wish | |
1048 | the kernel to keep certain signals hidden from us, we do it | |
1049 | by calling sigdelset (ptrace_events.pe_signals, signal) for | |
b83266a0 | 1050 | each such signal here, before doing PT_SET_EVENT_MASK. */ |
c906108c SS |
1051 | sigemptyset (&ptrace_events.pe_signals); |
1052 | ||
1053 | ptrace_events.pe_set_event = 0; | |
1054 | ||
1055 | ptrace_events.pe_set_event |= PTRACE_EXEC; | |
1056 | /* ??rehrauer: Add this one when we're prepared to catch it... | |
c5aa993b JM |
1057 | ptrace_events.pe_set_event |= PTRACE_EXIT; |
1058 | */ | |
c906108c SS |
1059 | |
1060 | errno = 0; | |
1061 | pt_status = call_ptrace (PT_SET_EVENT_MASK, | |
c5aa993b JM |
1062 | pid, |
1063 | (PTRACE_ARG3_TYPE) & ptrace_events, | |
1064 | sizeof (ptrace_events)); | |
c906108c SS |
1065 | if (errno) |
1066 | perror_with_name ("ptrace"); | |
1067 | if (pt_status < 0) | |
1068 | return; | |
1069 | #endif | |
1070 | } | |
1071 | ||
1072 | /* This function is called by the parent process, with pid being the | |
1073 | ID of the child process, after the debugger has forked. */ | |
1074 | ||
1075 | void | |
fba45db2 | 1076 | child_acknowledge_created_inferior (int pid) |
c906108c SS |
1077 | { |
1078 | /* We need a memory home for a constant. */ | |
1079 | int tc_magic_parent = PT_VERSION; | |
1080 | int tc_magic_child = 0; | |
1081 | ||
b83266a0 SS |
1082 | /* The remainder of this function is only useful for HPUX 10.0 and |
1083 | later, as it depends upon the ability to request notification | |
1084 | of specific kinds of events by the kernel. */ | |
1085 | #if defined(PT_SET_EVENT_MASK) | |
c906108c SS |
1086 | /* Wait for the child to tell us that it has forked. */ |
1087 | read (startup_semaphore.child_channel[SEM_LISTEN], | |
b83266a0 | 1088 | &tc_magic_child, |
c5aa993b | 1089 | sizeof (tc_magic_child)); |
c906108c SS |
1090 | |
1091 | /* Notify the child that it can exec. | |
1092 | ||
1093 | In the infttrace.c variant of this function, we set the child's | |
1094 | event mask after the fork but before the exec. In the ptrace | |
1095 | world, it seems we can't set the event mask until after the exec. */ | |
c906108c | 1096 | write (startup_semaphore.parent_channel[SEM_TALK], |
b83266a0 SS |
1097 | &tc_magic_parent, |
1098 | sizeof (tc_magic_parent)); | |
c906108c SS |
1099 | |
1100 | /* We'd better pause a bit before trying to set the event mask, | |
1101 | though, to ensure that the exec has happened. We don't want to | |
1102 | wait() on the child, because that'll screw up the upper layers | |
1103 | of gdb's execution control that expect to see the exec event. | |
1104 | ||
1105 | After an exec, the child is no longer executing gdb code. Hence, | |
1106 | we can't have yet another synchronization via the pipes. We'll | |
1107 | just sleep for a second, and hope that's enough delay... */ | |
c906108c SS |
1108 | sleep (1); |
1109 | ||
1110 | /* Instruct the kernel as to the set of events we wish to be | |
1111 | informed of. */ | |
c906108c SS |
1112 | require_notification_of_exec_events (pid); |
1113 | ||
1114 | /* Discard our copy of the semaphore. */ | |
1115 | (void) close (startup_semaphore.parent_channel[SEM_LISTEN]); | |
1116 | (void) close (startup_semaphore.parent_channel[SEM_TALK]); | |
1117 | (void) close (startup_semaphore.child_channel[SEM_LISTEN]); | |
1118 | (void) close (startup_semaphore.child_channel[SEM_TALK]); | |
b83266a0 | 1119 | #endif |
c906108c SS |
1120 | } |
1121 | ||
1122 | void | |
39f77062 | 1123 | child_post_startup_inferior (ptid_t ptid) |
c906108c | 1124 | { |
39f77062 | 1125 | require_notification_of_events (PIDGET (ptid)); |
c906108c SS |
1126 | } |
1127 | ||
1128 | void | |
fba45db2 | 1129 | child_post_attach (int pid) |
c906108c SS |
1130 | { |
1131 | require_notification_of_events (pid); | |
1132 | } | |
1133 | ||
1134 | int | |
fba45db2 | 1135 | child_insert_fork_catchpoint (int pid) |
c906108c SS |
1136 | { |
1137 | /* This request is only available on HPUX 10.0 and later. */ | |
1138 | #if !defined(PT_SET_EVENT_MASK) | |
1139 | error ("Unable to catch forks prior to HPUX 10.0"); | |
1140 | #else | |
1141 | /* Enable reporting of fork events from the kernel. */ | |
1142 | /* ??rehrauer: For the moment, we're always enabling these events, | |
b83266a0 | 1143 | and just ignoring them if there's no catchpoint to catch them. */ |
c906108c SS |
1144 | return 0; |
1145 | #endif | |
1146 | } | |
1147 | ||
1148 | int | |
fba45db2 | 1149 | child_remove_fork_catchpoint (int pid) |
c906108c SS |
1150 | { |
1151 | /* This request is only available on HPUX 10.0 and later. */ | |
1152 | #if !defined(PT_SET_EVENT_MASK) | |
1153 | error ("Unable to catch forks prior to HPUX 10.0"); | |
1154 | #else | |
1155 | /* Disable reporting of fork events from the kernel. */ | |
1156 | /* ??rehrauer: For the moment, we're always enabling these events, | |
1157 | and just ignoring them if there's no catchpoint to catch them. */ | |
1158 | return 0; | |
1159 | #endif | |
1160 | } | |
1161 | ||
1162 | int | |
fba45db2 | 1163 | child_insert_vfork_catchpoint (int pid) |
c906108c SS |
1164 | { |
1165 | /* This request is only available on HPUX 10.0 and later. */ | |
1166 | #if !defined(PT_SET_EVENT_MASK) | |
1167 | error ("Unable to catch vforks prior to HPUX 10.0"); | |
1168 | #else | |
1169 | /* Enable reporting of vfork events from the kernel. */ | |
1170 | /* ??rehrauer: For the moment, we're always enabling these events, | |
1171 | and just ignoring them if there's no catchpoint to catch them. */ | |
1172 | return 0; | |
1173 | #endif | |
1174 | } | |
1175 | ||
1176 | int | |
fba45db2 | 1177 | child_remove_vfork_catchpoint (int pid) |
c906108c SS |
1178 | { |
1179 | /* This request is only available on HPUX 10.0 and later. */ | |
1180 | #if !defined(PT_SET_EVENT_MASK) | |
1181 | error ("Unable to catch vforks prior to HPUX 10.0"); | |
1182 | #else | |
1183 | /* Disable reporting of vfork events from the kernel. */ | |
1184 | /* ??rehrauer: For the moment, we're always enabling these events, | |
1185 | and just ignoring them if there's no catchpoint to catch them. */ | |
1186 | return 0; | |
1187 | #endif | |
1188 | } | |
1189 | ||
1190 | int | |
47932f85 | 1191 | hpux_has_forked (int pid, int *childpid) |
c906108c SS |
1192 | { |
1193 | /* This request is only available on HPUX 10.0 and later. */ | |
1194 | #if !defined(PT_GET_PROCESS_STATE) | |
1195 | *childpid = 0; | |
1196 | return 0; | |
1197 | #else | |
1198 | int pt_status; | |
c5aa993b | 1199 | ptrace_state_t ptrace_state; |
c906108c SS |
1200 | |
1201 | errno = 0; | |
1202 | pt_status = call_ptrace (PT_GET_PROCESS_STATE, | |
b83266a0 | 1203 | pid, |
c5aa993b | 1204 | (PTRACE_ARG3_TYPE) & ptrace_state, |
b83266a0 | 1205 | sizeof (ptrace_state)); |
c906108c SS |
1206 | if (errno) |
1207 | perror_with_name ("ptrace"); | |
1208 | if (pt_status < 0) | |
1209 | return 0; | |
1210 | ||
1211 | if (ptrace_state.pe_report_event & PTRACE_FORK) | |
1212 | { | |
1213 | *childpid = ptrace_state.pe_other_pid; | |
1214 | return 1; | |
1215 | } | |
1216 | ||
1217 | return 0; | |
1218 | #endif | |
1219 | } | |
1220 | ||
1221 | int | |
47932f85 | 1222 | hpux_has_vforked (int pid, int *childpid) |
c906108c SS |
1223 | { |
1224 | /* This request is only available on HPUX 10.0 and later. */ | |
1225 | #if !defined(PT_GET_PROCESS_STATE) | |
1226 | *childpid = 0; | |
1227 | return 0; | |
1228 | ||
1229 | #else | |
1230 | int pt_status; | |
c5aa993b | 1231 | ptrace_state_t ptrace_state; |
c906108c SS |
1232 | |
1233 | errno = 0; | |
1234 | pt_status = call_ptrace (PT_GET_PROCESS_STATE, | |
b83266a0 | 1235 | pid, |
c5aa993b | 1236 | (PTRACE_ARG3_TYPE) & ptrace_state, |
b83266a0 | 1237 | sizeof (ptrace_state)); |
c906108c SS |
1238 | if (errno) |
1239 | perror_with_name ("ptrace"); | |
1240 | if (pt_status < 0) | |
1241 | return 0; | |
1242 | ||
1243 | if (ptrace_state.pe_report_event & PTRACE_VFORK) | |
1244 | { | |
1245 | *childpid = ptrace_state.pe_other_pid; | |
1246 | return 1; | |
1247 | } | |
1248 | ||
1249 | return 0; | |
1250 | #endif | |
1251 | } | |
1252 | ||
c906108c | 1253 | int |
fba45db2 | 1254 | child_insert_exec_catchpoint (int pid) |
c906108c | 1255 | { |
b83266a0 | 1256 | /* This request is only available on HPUX 10.0 and later. */ |
c906108c SS |
1257 | #if !defined(PT_SET_EVENT_MASK) |
1258 | error ("Unable to catch execs prior to HPUX 10.0"); | |
1259 | ||
1260 | #else | |
b83266a0 | 1261 | /* Enable reporting of exec events from the kernel. */ |
c906108c | 1262 | /* ??rehrauer: For the moment, we're always enabling these events, |
b83266a0 | 1263 | and just ignoring them if there's no catchpoint to catch them. */ |
c906108c SS |
1264 | return 0; |
1265 | #endif | |
1266 | } | |
1267 | ||
1268 | int | |
fba45db2 | 1269 | child_remove_exec_catchpoint (int pid) |
c906108c | 1270 | { |
b83266a0 | 1271 | /* This request is only available on HPUX 10.0 and later. */ |
c906108c SS |
1272 | #if !defined(PT_SET_EVENT_MASK) |
1273 | error ("Unable to catch execs prior to HPUX 10.0"); | |
1274 | ||
1275 | #else | |
1276 | /* Disable reporting of exec events from the kernel. */ | |
1277 | /* ??rehrauer: For the moment, we're always enabling these events, | |
b83266a0 | 1278 | and just ignoring them if there's no catchpoint to catch them. */ |
c906108c SS |
1279 | return 0; |
1280 | #endif | |
1281 | } | |
1282 | ||
1283 | int | |
47932f85 | 1284 | hpux_has_execd (int pid, char **execd_pathname) |
c906108c | 1285 | { |
b83266a0 | 1286 | /* This request is only available on HPUX 10.0 and later. */ |
c906108c SS |
1287 | #if !defined(PT_GET_PROCESS_STATE) |
1288 | *execd_pathname = NULL; | |
1289 | return 0; | |
1290 | ||
1291 | #else | |
1292 | int pt_status; | |
c5aa993b | 1293 | ptrace_state_t ptrace_state; |
c906108c SS |
1294 | |
1295 | errno = 0; | |
1296 | pt_status = call_ptrace (PT_GET_PROCESS_STATE, | |
b83266a0 | 1297 | pid, |
c5aa993b | 1298 | (PTRACE_ARG3_TYPE) & ptrace_state, |
b83266a0 | 1299 | sizeof (ptrace_state)); |
c906108c SS |
1300 | if (errno) |
1301 | perror_with_name ("ptrace"); | |
1302 | if (pt_status < 0) | |
1303 | return 0; | |
1304 | ||
1305 | if (ptrace_state.pe_report_event & PTRACE_EXEC) | |
1306 | { | |
c5aa993b | 1307 | char *exec_file = target_pid_to_exec_file (pid); |
c906108c SS |
1308 | *execd_pathname = savestring (exec_file, strlen (exec_file)); |
1309 | return 1; | |
1310 | } | |
1311 | ||
1312 | return 0; | |
1313 | #endif | |
1314 | } | |
1315 | ||
1316 | int | |
fba45db2 | 1317 | child_reported_exec_events_per_exec_call (void) |
c906108c | 1318 | { |
c5aa993b | 1319 | return 2; /* ptrace reports the event twice per call. */ |
c906108c SS |
1320 | } |
1321 | ||
1322 | int | |
47932f85 | 1323 | hpux_has_syscall_event (int pid, enum target_waitkind *kind, int *syscall_id) |
c906108c SS |
1324 | { |
1325 | /* This request is only available on HPUX 10.30 and later, via | |
1326 | the ttrace interface. */ | |
1327 | ||
1328 | *kind = TARGET_WAITKIND_SPURIOUS; | |
1329 | *syscall_id = -1; | |
1330 | return 0; | |
1331 | } | |
1332 | ||
1333 | char * | |
fba45db2 | 1334 | child_pid_to_exec_file (int pid) |
c906108c | 1335 | { |
b83266a0 | 1336 | static char exec_file_buffer[1024]; |
c906108c | 1337 | int pt_status; |
b83266a0 SS |
1338 | CORE_ADDR top_of_stack; |
1339 | char four_chars[4]; | |
c906108c SS |
1340 | int name_index; |
1341 | int i; | |
39f77062 | 1342 | ptid_t saved_inferior_ptid; |
52287340 | 1343 | int done; |
c5aa993b | 1344 | |
c906108c SS |
1345 | #ifdef PT_GET_PROCESS_PATHNAME |
1346 | /* As of 10.x HP-UX, there's an explicit request to get the pathname. */ | |
1347 | pt_status = call_ptrace (PT_GET_PROCESS_PATHNAME, | |
b83266a0 SS |
1348 | pid, |
1349 | (PTRACE_ARG3_TYPE) exec_file_buffer, | |
1350 | sizeof (exec_file_buffer) - 1); | |
c906108c SS |
1351 | if (pt_status == 0) |
1352 | return exec_file_buffer; | |
1353 | #endif | |
1354 | ||
1355 | /* It appears that this request is broken prior to 10.30. | |
1356 | If it fails, try a really, truly amazingly gross hack | |
1357 | that DDE uses, of pawing through the process' data | |
1358 | segment to find the pathname. */ | |
1359 | ||
1360 | top_of_stack = 0x7b03a000; | |
1361 | name_index = 0; | |
1362 | done = 0; | |
1363 | ||
39f77062 KB |
1364 | /* On the chance that pid != inferior_ptid, set inferior_ptid |
1365 | to pid, so that (grrrr!) implicit uses of inferior_ptid get | |
c906108c SS |
1366 | the right id. */ |
1367 | ||
39f77062 KB |
1368 | saved_inferior_ptid = inferior_ptid; |
1369 | inferior_ptid = pid_to_ptid (pid); | |
c906108c SS |
1370 | |
1371 | /* Try to grab a null-terminated string. */ | |
c5aa993b | 1372 | while (!done) |
c906108c SS |
1373 | { |
1374 | if (target_read_memory (top_of_stack, four_chars, 4) != 0) | |
1375 | { | |
39f77062 | 1376 | inferior_ptid = saved_inferior_ptid; |
c906108c SS |
1377 | return NULL; |
1378 | } | |
1379 | for (i = 0; i < 4; i++) | |
1380 | { | |
1381 | exec_file_buffer[name_index++] = four_chars[i]; | |
1382 | done = (four_chars[i] == '\0'); | |
1383 | if (done) | |
1384 | break; | |
1385 | } | |
1386 | top_of_stack += 4; | |
1387 | } | |
1388 | ||
1389 | if (exec_file_buffer[0] == '\0') | |
1390 | { | |
39f77062 | 1391 | inferior_ptid = saved_inferior_ptid; |
c906108c SS |
1392 | return NULL; |
1393 | } | |
1394 | ||
39f77062 | 1395 | inferior_ptid = saved_inferior_ptid; |
c906108c SS |
1396 | return exec_file_buffer; |
1397 | } | |
1398 | ||
1399 | void | |
fba45db2 | 1400 | pre_fork_inferior (void) |
c906108c SS |
1401 | { |
1402 | int status; | |
1403 | ||
1404 | status = pipe (startup_semaphore.parent_channel); | |
1405 | if (status < 0) | |
1406 | { | |
1407 | warning ("error getting parent pipe for startup semaphore"); | |
1408 | return; | |
1409 | } | |
1410 | ||
1411 | status = pipe (startup_semaphore.child_channel); | |
1412 | if (status < 0) | |
1413 | { | |
1414 | warning ("error getting child pipe for startup semaphore"); | |
1415 | return; | |
1416 | } | |
1417 | } | |
c906108c | 1418 | \f |
c5aa993b | 1419 | |
c906108c SS |
1420 | /* Check to see if the given thread is alive. |
1421 | ||
1422 | This is a no-op, as ptrace doesn't support threads, so we just | |
1423 | return "TRUE". */ | |
1424 | ||
1425 | int | |
39f77062 | 1426 | child_thread_alive (ptid_t ptid) |
c906108c | 1427 | { |
c5aa993b | 1428 | return 1; |
c906108c SS |
1429 | } |
1430 | ||
1431 | #endif /* ! GDB_NATIVE_HPUX_11 */ |