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; | |
12c266ea | 101 | len = DEPRECATED_REGISTER_RAW_SIZE (regno); |
7be570e7 JM |
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 | |
12c266ea AC |
112 | DEPRECATED_REGISTER_RAW_SIZE(0) says. Assuming all HP-UX |
113 | PA machines are big-endian, put it at the least | |
114 | significant end of the value, and zap the rest of the | |
115 | buffer. */ | |
116 | offset = DEPRECATED_REGISTER_RAW_SIZE (0) - len; | |
7be570e7 JM |
117 | } |
118 | ||
119 | /* Floating-point registers come from the ss_fpblock area. */ | |
120 | else if (regno >= FP0_REGNUM) | |
121 | addr = (HPPAH_OFFSETOF (save_state_t, ss_fpblock) | |
62700349 | 122 | + (DEPRECATED_REGISTER_BYTE (regno) - DEPRECATED_REGISTER_BYTE (FP0_REGNUM))); |
7be570e7 JM |
123 | |
124 | /* Wide registers come from the ss_wide area. | |
125 | I think it's more PC to test (ss_flags & SS_WIDEREGS) to select | |
126 | between ss_wide and ss_narrow than to use the raw register size. | |
127 | But checking ss_flags would require an extra ptrace call for | |
128 | every register reference. Bleah. */ | |
129 | else if (len == 8) | |
130 | addr = (HPPAH_OFFSETOF (save_state_t, ss_wide) | |
62700349 | 131 | + DEPRECATED_REGISTER_BYTE (regno)); |
7be570e7 JM |
132 | |
133 | /* Narrow registers come from the ss_narrow area. Note that | |
134 | ss_narrow starts with gr1, not gr0. */ | |
135 | else if (len == 4) | |
136 | addr = (HPPAH_OFFSETOF (save_state_t, ss_narrow) | |
62700349 | 137 | + (DEPRECATED_REGISTER_BYTE (regno) - DEPRECATED_REGISTER_BYTE (1))); |
7be570e7 | 138 | else |
8e65ff28 AC |
139 | internal_error (__FILE__, __LINE__, |
140 | "hppah-nat.c (write_register): unexpected register size"); | |
7be570e7 JM |
141 | |
142 | #ifdef GDB_TARGET_IS_HPPA_20W | |
143 | /* Unbelieveable. The PC head and tail must be written in 64bit hunks | |
144 | or we will get an error. Worse yet, the oddball ptrace/ttrace | |
145 | layering will not allow us to perform a 64bit register store. | |
146 | ||
147 | What a crock. */ | |
148 | if (regno == PCOQ_HEAD_REGNUM || regno == PCOQ_TAIL_REGNUM && len == 8) | |
149 | { | |
150 | CORE_ADDR temp; | |
151 | ||
62700349 | 152 | temp = *(CORE_ADDR *)&deprecated_registers[DEPRECATED_REGISTER_BYTE (regno)]; |
7be570e7 JM |
153 | |
154 | /* Set the priv level (stored in the low two bits of the PC. */ | |
155 | temp |= 0x3; | |
156 | ||
39f77062 KB |
157 | ttrace_write_reg_64 (PIDGET (inferior_ptid), (CORE_ADDR)addr, |
158 | (CORE_ADDR)&temp); | |
7be570e7 JM |
159 | |
160 | /* If we fail to write the PC, give a true error instead of | |
161 | just a warning. */ | |
b83266a0 SS |
162 | if (errno != 0) |
163 | { | |
7be570e7 JM |
164 | char *err = safe_strerror (errno); |
165 | char *msg = alloca (strlen (err) + 128); | |
166 | sprintf (msg, "writing `%s' register: %s", | |
167 | REGISTER_NAME (regno), err); | |
168 | perror_with_name (msg); | |
b83266a0 | 169 | } |
7be570e7 | 170 | return; |
b83266a0 | 171 | } |
53a5351d JM |
172 | |
173 | /* Another crock. HPUX complains if you write a nonzero value to | |
174 | the high part of IPSW. What will it take for HP to catch a | |
175 | clue about building sensible interfaces? */ | |
176 | if (regno == IPSW_REGNUM && len == 8) | |
62700349 | 177 | *(int *)&deprecated_registers[DEPRECATED_REGISTER_BYTE (regno)] = 0; |
7be570e7 JM |
178 | #endif |
179 | ||
180 | for (i = 0; i < len; i += sizeof (int)) | |
181 | { | |
182 | errno = 0; | |
39f77062 KB |
183 | call_ptrace (PT_WUREGS, PIDGET (inferior_ptid), |
184 | (PTRACE_ARG3_TYPE) addr + i, | |
62700349 | 185 | *(int *) &deprecated_registers[DEPRECATED_REGISTER_BYTE (regno) + i]); |
7be570e7 JM |
186 | if (errno != 0) |
187 | { | |
188 | /* Warning, not error, in case we are attached; sometimes | |
189 | the kernel doesn't let us at the registers. */ | |
190 | char *err = safe_strerror (errno); | |
191 | char *msg = alloca (strlen (err) + 128); | |
53a5351d | 192 | sprintf (msg, "writing `%s' register: %s", |
7be570e7 JM |
193 | REGISTER_NAME (regno), err); |
194 | /* If we fail to write the PC, give a true error instead of | |
195 | just a warning. */ | |
196 | if (regno == PCOQ_HEAD_REGNUM || regno == PCOQ_TAIL_REGNUM) | |
197 | perror_with_name (msg); | |
198 | else | |
c906108c | 199 | warning (msg); |
7be570e7 JM |
200 | return; |
201 | } | |
202 | } | |
c906108c SS |
203 | } |
204 | else | |
205 | for (regno = 0; regno < NUM_REGS; regno++) | |
206 | store_inferior_registers (regno); | |
207 | } | |
208 | ||
c906108c | 209 | |
adf40b2e | 210 | /* Fetch a register's value from the process's U area. */ |
c906108c | 211 | static void |
fba45db2 | 212 | fetch_register (int regno) |
c906108c | 213 | { |
123a958e | 214 | char buf[MAX_REGISTER_SIZE]; |
adf40b2e JM |
215 | unsigned int addr, len, offset; |
216 | int i; | |
c906108c | 217 | |
adf40b2e | 218 | offset = 0; |
12c266ea | 219 | len = DEPRECATED_REGISTER_RAW_SIZE (regno); |
adf40b2e JM |
220 | |
221 | /* Requests for register zero actually want the save_state's | |
222 | ss_flags member. As RM says: "Oh, what a hack!" */ | |
223 | if (regno == 0) | |
224 | { | |
225 | save_state_t ss; | |
226 | addr = HPPAH_OFFSETOF (save_state_t, ss_flags); | |
227 | len = sizeof (ss.ss_flags); | |
228 | ||
229 | /* Note that ss_flags is always an int, no matter what | |
12c266ea AC |
230 | DEPRECATED_REGISTER_RAW_SIZE(0) says. Assuming all HP-UX PA |
231 | machines are big-endian, put it at the least significant end | |
232 | of the value, and zap the rest of the buffer. */ | |
233 | offset = DEPRECATED_REGISTER_RAW_SIZE (0) - len; | |
adf40b2e JM |
234 | memset (buf, 0, sizeof (buf)); |
235 | } | |
c906108c | 236 | |
adf40b2e JM |
237 | /* Floating-point registers come from the ss_fpblock area. */ |
238 | else if (regno >= FP0_REGNUM) | |
239 | addr = (HPPAH_OFFSETOF (save_state_t, ss_fpblock) | |
62700349 | 240 | + (DEPRECATED_REGISTER_BYTE (regno) - DEPRECATED_REGISTER_BYTE (FP0_REGNUM))); |
adf40b2e JM |
241 | |
242 | /* Wide registers come from the ss_wide area. | |
243 | I think it's more PC to test (ss_flags & SS_WIDEREGS) to select | |
244 | between ss_wide and ss_narrow than to use the raw register size. | |
245 | But checking ss_flags would require an extra ptrace call for | |
246 | every register reference. Bleah. */ | |
247 | else if (len == 8) | |
248 | addr = (HPPAH_OFFSETOF (save_state_t, ss_wide) | |
62700349 | 249 | + DEPRECATED_REGISTER_BYTE (regno)); |
adf40b2e JM |
250 | |
251 | /* Narrow registers come from the ss_narrow area. Note that | |
252 | ss_narrow starts with gr1, not gr0. */ | |
253 | else if (len == 4) | |
254 | addr = (HPPAH_OFFSETOF (save_state_t, ss_narrow) | |
62700349 | 255 | + (DEPRECATED_REGISTER_BYTE (regno) - DEPRECATED_REGISTER_BYTE (1))); |
c906108c | 256 | |
adf40b2e | 257 | else |
8e65ff28 AC |
258 | internal_error (__FILE__, __LINE__, |
259 | "hppa-nat.c (fetch_register): unexpected register size"); | |
adf40b2e JM |
260 | |
261 | for (i = 0; i < len; i += sizeof (int)) | |
c906108c SS |
262 | { |
263 | errno = 0; | |
adf40b2e JM |
264 | /* Copy an int from the U area to buf. Fill the least |
265 | significant end if len != raw_size. */ | |
266 | * (int *) &buf[offset + i] = | |
39f77062 | 267 | call_ptrace (PT_RUREGS, PIDGET (inferior_ptid), |
adf40b2e | 268 | (PTRACE_ARG3_TYPE) addr + i, 0); |
c906108c SS |
269 | if (errno != 0) |
270 | { | |
adf40b2e JM |
271 | /* Warning, not error, in case we are attached; sometimes |
272 | the kernel doesn't let us at the registers. */ | |
c906108c SS |
273 | char *err = safe_strerror (errno); |
274 | char *msg = alloca (strlen (err) + 128); | |
adf40b2e JM |
275 | sprintf (msg, "reading `%s' register: %s", |
276 | REGISTER_NAME (regno), err); | |
c906108c | 277 | warning (msg); |
adf40b2e | 278 | return; |
c906108c SS |
279 | } |
280 | } | |
adf40b2e JM |
281 | |
282 | /* If we're reading an address from the instruction address queue, | |
283 | mask out the bottom two bits --- they contain the privilege | |
284 | level. */ | |
c906108c | 285 | if (regno == PCOQ_HEAD_REGNUM || regno == PCOQ_TAIL_REGNUM) |
adf40b2e JM |
286 | buf[len - 1] &= ~0x3; |
287 | ||
c906108c | 288 | supply_register (regno, buf); |
c906108c SS |
289 | } |
290 | ||
adf40b2e | 291 | |
c906108c SS |
292 | /* Copy LEN bytes to or from inferior's memory starting at MEMADDR |
293 | to debugger memory starting at MYADDR. Copy to inferior if | |
294 | WRITE is nonzero. | |
c5aa993b | 295 | |
c906108c SS |
296 | Returns the length copied, which is either the LEN argument or zero. |
297 | This xfer function does not do partial moves, since child_ops | |
298 | doesn't allow memory operations to cross below us in the target stack | |
8fef05cc | 299 | anyway. TARGET is ignored. */ |
c906108c SS |
300 | |
301 | int | |
8fef05cc | 302 | child_xfer_memory (CORE_ADDR memaddr, char *myaddr, int len, int write, |
240be855 | 303 | struct mem_attrib *mem, |
8fef05cc | 304 | struct target_ops *target) |
c906108c | 305 | { |
52f0bd74 | 306 | int i; |
c906108c | 307 | /* Round starting address down to longword boundary. */ |
52f0bd74 | 308 | CORE_ADDR addr = memaddr & - (CORE_ADDR)(sizeof (int)); |
c906108c | 309 | /* Round ending address up; get number of longwords that makes. */ |
52f0bd74 | 310 | int count |
c5aa993b | 311 | = (((memaddr + len) - addr) + sizeof (int) - 1) / sizeof (int); |
c906108c | 312 | |
b83266a0 SS |
313 | /* Allocate buffer of that many longwords. |
314 | Note -- do not use alloca to allocate this buffer since there is no | |
315 | guarantee of when the buffer will actually be deallocated. | |
316 | ||
317 | This routine can be called over and over with the same call chain; | |
318 | this (in effect) would pile up all those alloca requests until a call | |
319 | to alloca was made from a point higher than this routine in the | |
320 | call chain. */ | |
52f0bd74 | 321 | int *buffer = (int *) xmalloc (count * sizeof (int)); |
c906108c SS |
322 | |
323 | if (write) | |
324 | { | |
325 | /* Fill start and end extra bytes of buffer with existing memory data. */ | |
c5aa993b | 326 | if (addr != memaddr || len < (int) sizeof (int)) |
b83266a0 SS |
327 | { |
328 | /* Need part of initial word -- fetch it. */ | |
c5aa993b | 329 | buffer[0] = call_ptrace (addr < text_end ? PT_RIUSER : PT_RDUSER, |
39f77062 KB |
330 | PIDGET (inferior_ptid), |
331 | (PTRACE_ARG3_TYPE) addr, 0); | |
b83266a0 | 332 | } |
c906108c SS |
333 | |
334 | if (count > 1) /* FIXME, avoid if even boundary */ | |
335 | { | |
336 | buffer[count - 1] | |
b83266a0 | 337 | = call_ptrace (addr < text_end ? PT_RIUSER : PT_RDUSER, |
39f77062 | 338 | PIDGET (inferior_ptid), |
b83266a0 SS |
339 | (PTRACE_ARG3_TYPE) (addr |
340 | + (count - 1) * sizeof (int)), | |
341 | 0); | |
c906108c SS |
342 | } |
343 | ||
344 | /* Copy data to be written over corresponding part of buffer */ | |
c906108c SS |
345 | memcpy ((char *) buffer + (memaddr & (sizeof (int) - 1)), myaddr, len); |
346 | ||
347 | /* Write the entire buffer. */ | |
c906108c SS |
348 | for (i = 0; i < count; i++, addr += sizeof (int)) |
349 | { | |
b83266a0 SS |
350 | int pt_status; |
351 | int pt_request; | |
352 | /* The HP-UX kernel crashes if you use PT_WDUSER to write into the | |
353 | text segment. FIXME -- does it work to write into the data | |
354 | segment using WIUSER, or do these idiots really expect us to | |
355 | figure out which segment the address is in, so we can use a | |
356 | separate system call for it??! */ | |
c906108c | 357 | errno = 0; |
b83266a0 | 358 | pt_request = (addr < text_end) ? PT_WIUSER : PT_WDUSER; |
c906108c | 359 | pt_status = call_ptrace (pt_request, |
39f77062 | 360 | PIDGET (inferior_ptid), |
b83266a0 SS |
361 | (PTRACE_ARG3_TYPE) addr, |
362 | buffer[i]); | |
363 | ||
364 | /* Did we fail? Might we've guessed wrong about which | |
365 | segment this address resides in? Try the other request, | |
366 | and see if that works... */ | |
367 | if ((pt_status == -1) && errno) | |
368 | { | |
369 | errno = 0; | |
370 | pt_request = (pt_request == PT_WIUSER) ? PT_WDUSER : PT_WIUSER; | |
371 | pt_status = call_ptrace (pt_request, | |
39f77062 | 372 | PIDGET (inferior_ptid), |
b83266a0 SS |
373 | (PTRACE_ARG3_TYPE) addr, |
374 | buffer[i]); | |
375 | ||
376 | /* No, we still fail. Okay, time to punt. */ | |
377 | if ((pt_status == -1) && errno) | |
378 | { | |
b8c9b27d | 379 | xfree (buffer); |
b83266a0 SS |
380 | return 0; |
381 | } | |
382 | } | |
c906108c SS |
383 | } |
384 | } | |
385 | else | |
386 | { | |
387 | /* Read all the longwords */ | |
388 | for (i = 0; i < count; i++, addr += sizeof (int)) | |
389 | { | |
390 | errno = 0; | |
c5aa993b | 391 | buffer[i] = call_ptrace (addr < text_end ? PT_RIUSER : PT_RDUSER, |
39f77062 KB |
392 | PIDGET (inferior_ptid), |
393 | (PTRACE_ARG3_TYPE) addr, 0); | |
b83266a0 SS |
394 | if (errno) |
395 | { | |
b8c9b27d | 396 | xfree (buffer); |
b83266a0 SS |
397 | return 0; |
398 | } | |
c906108c SS |
399 | QUIT; |
400 | } | |
401 | ||
402 | /* Copy appropriate bytes out of the buffer. */ | |
403 | memcpy (myaddr, (char *) buffer + (memaddr & (sizeof (int) - 1)), len); | |
404 | } | |
b8c9b27d | 405 | xfree (buffer); |
c906108c SS |
406 | return len; |
407 | } | |
408 | ||
7d2830a3 | 409 | char *saved_child_execd_pathname = NULL; |
6604731b | 410 | int saved_vfork_pid; |
7d2830a3 DJ |
411 | enum { |
412 | STATE_NONE, | |
413 | STATE_GOT_CHILD, | |
414 | STATE_GOT_EXEC, | |
415 | STATE_GOT_PARENT, | |
416 | STATE_FAKE_EXEC | |
417 | } saved_vfork_state = STATE_NONE; | |
c906108c | 418 | |
6604731b DJ |
419 | int |
420 | child_follow_fork (int follow_child) | |
c906108c | 421 | { |
6604731b DJ |
422 | ptid_t last_ptid; |
423 | struct target_waitstatus last_status; | |
424 | int has_vforked; | |
425 | int parent_pid, child_pid; | |
426 | ||
427 | get_last_target_status (&last_ptid, &last_status); | |
428 | has_vforked = (last_status.kind == TARGET_WAITKIND_VFORKED); | |
429 | parent_pid = ptid_get_pid (last_ptid); | |
430 | child_pid = last_status.value.related_pid; | |
431 | ||
432 | /* At this point, if we are vforking, breakpoints were already | |
433 | detached from the child in child_wait; and the child has already | |
434 | called execve(). If we are forking, both the parent and child | |
435 | have breakpoints inserted. */ | |
436 | ||
437 | if (! follow_child) | |
c906108c | 438 | { |
6604731b DJ |
439 | if (! has_vforked) |
440 | { | |
441 | detach_breakpoints (child_pid); | |
442 | #ifdef SOLIB_REMOVE_INFERIOR_HOOK | |
443 | SOLIB_REMOVE_INFERIOR_HOOK (child_pid); | |
444 | #endif | |
445 | } | |
446 | ||
447 | /* Detach from the child. */ | |
4c9ba7e0 DJ |
448 | printf_unfiltered ("Detaching after fork from %s\n", |
449 | target_pid_to_str (pid_to_ptid (child_pid))); | |
450 | hppa_require_detach (child_pid, 0); | |
6604731b DJ |
451 | |
452 | /* The parent and child of a vfork share the same address space. | |
453 | Also, on some targets the order in which vfork and exec events | |
454 | are received for parent in child requires some delicate handling | |
455 | of the events. | |
456 | ||
457 | For instance, on ptrace-based HPUX we receive the child's vfork | |
458 | event first, at which time the parent has been suspended by the | |
459 | OS and is essentially untouchable until the child's exit or second | |
460 | exec event arrives. At that time, the parent's vfork event is | |
461 | delivered to us, and that's when we see and decide how to follow | |
462 | the vfork. But to get to that point, we must continue the child | |
463 | until it execs or exits. To do that smoothly, all breakpoints | |
464 | must be removed from the child, in case there are any set between | |
465 | the vfork() and exec() calls. But removing them from the child | |
466 | also removes them from the parent, due to the shared-address-space | |
467 | nature of a vfork'd parent and child. On HPUX, therefore, we must | |
468 | take care to restore the bp's to the parent before we continue it. | |
469 | Else, it's likely that we may not stop in the expected place. (The | |
470 | worst scenario is when the user tries to step over a vfork() call; | |
471 | the step-resume bp must be restored for the step to properly stop | |
472 | in the parent after the call completes!) | |
473 | ||
474 | Sequence of events, as reported to gdb from HPUX: | |
475 | ||
476 | Parent Child Action for gdb to take | |
477 | ------------------------------------------------------- | |
478 | 1 VFORK Continue child | |
479 | 2 EXEC | |
480 | 3 EXEC or EXIT | |
481 | 4 VFORK | |
482 | ||
483 | Now that the child has safely exec'd or exited, we must restore | |
484 | the parent's breakpoints before we continue it. Else, we may | |
485 | cause it run past expected stopping points. */ | |
486 | ||
487 | if (has_vforked) | |
488 | reattach_breakpoints (parent_pid); | |
c906108c | 489 | } |
6604731b DJ |
490 | else |
491 | { | |
6604731b DJ |
492 | /* Needed to keep the breakpoint lists in sync. */ |
493 | if (! has_vforked) | |
494 | detach_breakpoints (child_pid); | |
7d2830a3 | 495 | |
6604731b DJ |
496 | /* Before detaching from the parent, remove all breakpoints from it. */ |
497 | remove_breakpoints (); | |
498 | ||
499 | /* Also reset the solib inferior hook from the parent. */ | |
500 | #ifdef SOLIB_REMOVE_INFERIOR_HOOK | |
501 | SOLIB_REMOVE_INFERIOR_HOOK (PIDGET (inferior_ptid)); | |
502 | #endif | |
7d2830a3 | 503 | |
6604731b DJ |
504 | /* Detach from the parent. */ |
505 | target_detach (NULL, 1); | |
506 | ||
507 | /* Attach to the child. */ | |
4c9ba7e0 DJ |
508 | printf_unfiltered ("Attaching after fork to %s\n", |
509 | target_pid_to_str (pid_to_ptid (child_pid))); | |
510 | hppa_require_attach (child_pid); | |
6604731b | 511 | inferior_ptid = pid_to_ptid (child_pid); |
6604731b DJ |
512 | |
513 | /* If we vforked, then we've also execed by now. The exec will be | |
514 | reported momentarily. follow_exec () will handle breakpoints, so | |
515 | we don't have to.. */ | |
516 | if (!has_vforked) | |
517 | follow_inferior_reset_breakpoints (); | |
518 | } | |
519 | ||
520 | if (has_vforked) | |
c906108c | 521 | { |
6604731b DJ |
522 | /* If we followed the parent, don't try to follow the child's exec. */ |
523 | if (saved_vfork_state != STATE_GOT_PARENT | |
524 | && saved_vfork_state != STATE_FAKE_EXEC) | |
525 | fprintf_unfiltered (gdb_stdout, | |
526 | "hppa: post follow vfork: confused state\n"); | |
527 | ||
528 | if (! follow_child || saved_vfork_state == STATE_GOT_PARENT) | |
529 | saved_vfork_state = STATE_NONE; | |
530 | else | |
531 | return 1; | |
c906108c | 532 | } |
6604731b | 533 | return 0; |
c906108c SS |
534 | } |
535 | ||
b83266a0 SS |
536 | /* Format a process id, given PID. Be sure to terminate |
537 | this with a null--it's going to be printed via a "%s". */ | |
c906108c | 538 | char * |
39f77062 | 539 | child_pid_to_str (ptid_t ptid) |
c906108c | 540 | { |
c5aa993b JM |
541 | /* Static because address returned */ |
542 | static char buf[30]; | |
39f77062 | 543 | pid_t pid = PIDGET (ptid); |
c906108c | 544 | |
ce414844 AC |
545 | /* Extra NUL for paranoia's sake */ |
546 | sprintf (buf, "process %d%c", pid, '\0'); | |
c5aa993b JM |
547 | |
548 | return buf; | |
c906108c SS |
549 | } |
550 | ||
b83266a0 SS |
551 | /* Format a thread id, given TID. Be sure to terminate |
552 | this with a null--it's going to be printed via a "%s". | |
553 | ||
554 | Note: This is a core-gdb tid, not the actual system tid. | |
c5aa993b | 555 | See infttrace.c for details. */ |
c906108c | 556 | char * |
39f77062 | 557 | hppa_tid_to_str (ptid_t ptid) |
c906108c | 558 | { |
c5aa993b JM |
559 | /* Static because address returned */ |
560 | static char buf[30]; | |
39f77062 KB |
561 | /* This seems strange, but when I did the ptid conversion, it looked |
562 | as though a pid was always being passed. - Kevin Buettner */ | |
563 | pid_t tid = PIDGET (ptid); | |
c5aa993b JM |
564 | |
565 | /* Extra NULLs for paranoia's sake */ | |
ce414844 | 566 | sprintf (buf, "system thread %d%c", tid, '\0'); |
c906108c | 567 | |
c5aa993b | 568 | return buf; |
c906108c SS |
569 | } |
570 | ||
47932f85 DJ |
571 | /*## */ |
572 | /* Enable HACK for ttrace work. In | |
573 | * infttrace.c/require_notification_of_events, | |
574 | * this is set to 0 so that the loop in child_wait | |
575 | * won't loop. | |
576 | */ | |
577 | int not_same_real_pid = 1; | |
578 | /*## */ | |
579 | ||
47932f85 DJ |
580 | /* Wait for child to do something. Return pid of child, or -1 in case |
581 | of error; store status through argument pointer OURSTATUS. */ | |
582 | ||
583 | ptid_t | |
584 | child_wait (ptid_t ptid, struct target_waitstatus *ourstatus) | |
585 | { | |
586 | int save_errno; | |
587 | int status; | |
588 | char *execd_pathname = NULL; | |
589 | int exit_status; | |
590 | int related_pid; | |
591 | int syscall_id; | |
592 | enum target_waitkind kind; | |
593 | int pid; | |
594 | ||
7d2830a3 DJ |
595 | if (saved_vfork_state == STATE_FAKE_EXEC) |
596 | { | |
597 | saved_vfork_state = STATE_NONE; | |
598 | ourstatus->kind = TARGET_WAITKIND_EXECD; | |
599 | ourstatus->value.execd_pathname = saved_child_execd_pathname; | |
600 | return inferior_ptid; | |
601 | } | |
602 | ||
47932f85 DJ |
603 | do |
604 | { | |
605 | set_sigint_trap (); /* Causes SIGINT to be passed on to the | |
606 | attached process. */ | |
607 | set_sigio_trap (); | |
608 | ||
609 | pid = ptrace_wait (inferior_ptid, &status); | |
610 | ||
611 | save_errno = errno; | |
612 | ||
613 | clear_sigio_trap (); | |
614 | ||
615 | clear_sigint_trap (); | |
616 | ||
617 | if (pid == -1) | |
618 | { | |
619 | if (save_errno == EINTR) | |
620 | continue; | |
621 | ||
622 | fprintf_unfiltered (gdb_stderr, "Child process unexpectedly missing: %s.\n", | |
623 | safe_strerror (save_errno)); | |
624 | ||
625 | /* Claim it exited with unknown signal. */ | |
626 | ourstatus->kind = TARGET_WAITKIND_SIGNALLED; | |
627 | ourstatus->value.sig = TARGET_SIGNAL_UNKNOWN; | |
628 | return pid_to_ptid (-1); | |
629 | } | |
630 | ||
631 | /* Did it exit? | |
632 | */ | |
633 | if (target_has_exited (pid, status, &exit_status)) | |
634 | { | |
635 | /* ??rehrauer: For now, ignore this. */ | |
636 | continue; | |
637 | } | |
638 | ||
639 | if (!target_thread_alive (pid_to_ptid (pid))) | |
640 | { | |
641 | ourstatus->kind = TARGET_WAITKIND_SPURIOUS; | |
642 | return pid_to_ptid (pid); | |
643 | } | |
644 | ||
8e7d2c16 | 645 | if (hpux_has_forked (pid, &related_pid)) |
47932f85 | 646 | { |
8e7d2c16 DJ |
647 | /* Ignore the parent's fork event. */ |
648 | if (pid == PIDGET (inferior_ptid)) | |
649 | { | |
650 | ourstatus->kind = TARGET_WAITKIND_IGNORE; | |
651 | return inferior_ptid; | |
652 | } | |
653 | ||
654 | /* If this is the child's fork event, report that the | |
655 | process has forked. */ | |
656 | if (related_pid == PIDGET (inferior_ptid)) | |
657 | { | |
658 | ourstatus->kind = TARGET_WAITKIND_FORKED; | |
659 | ourstatus->value.related_pid = pid; | |
660 | return inferior_ptid; | |
661 | } | |
47932f85 DJ |
662 | } |
663 | ||
7d2830a3 | 664 | if (hpux_has_vforked (pid, &related_pid)) |
47932f85 | 665 | { |
7d2830a3 DJ |
666 | if (pid == PIDGET (inferior_ptid)) |
667 | { | |
668 | if (saved_vfork_state == STATE_GOT_CHILD) | |
669 | saved_vfork_state = STATE_GOT_PARENT; | |
670 | else if (saved_vfork_state == STATE_GOT_EXEC) | |
671 | saved_vfork_state = STATE_FAKE_EXEC; | |
672 | else | |
673 | fprintf_unfiltered (gdb_stdout, | |
674 | "hppah: parent vfork: confused\n"); | |
675 | } | |
676 | else if (related_pid == PIDGET (inferior_ptid)) | |
677 | { | |
678 | if (saved_vfork_state == STATE_NONE) | |
679 | saved_vfork_state = STATE_GOT_CHILD; | |
680 | else | |
681 | fprintf_unfiltered (gdb_stdout, | |
682 | "hppah: child vfork: confused\n"); | |
683 | } | |
684 | else | |
685 | fprintf_unfiltered (gdb_stdout, | |
686 | "hppah: unknown vfork: confused\n"); | |
687 | ||
688 | if (saved_vfork_state == STATE_GOT_CHILD) | |
689 | { | |
690 | child_post_startup_inferior (pid_to_ptid (pid)); | |
6604731b DJ |
691 | detach_breakpoints (pid); |
692 | #ifdef SOLIB_REMOVE_INFERIOR_HOOK | |
693 | SOLIB_REMOVE_INFERIOR_HOOK (pid); | |
694 | #endif | |
695 | child_resume (pid_to_ptid (pid), 0, TARGET_SIGNAL_0); | |
696 | ourstatus->kind = TARGET_WAITKIND_IGNORE; | |
697 | return pid_to_ptid (related_pid); | |
7d2830a3 | 698 | } |
6604731b | 699 | else if (saved_vfork_state == STATE_FAKE_EXEC) |
7d2830a3 DJ |
700 | { |
701 | ourstatus->kind = TARGET_WAITKIND_VFORKED; | |
702 | ourstatus->value.related_pid = related_pid; | |
703 | return pid_to_ptid (pid); | |
704 | } | |
6604731b DJ |
705 | else |
706 | { | |
707 | /* We saw the parent's vfork, but we haven't seen the exec yet. | |
708 | Wait for it, for simplicity's sake. It should be pending. */ | |
709 | saved_vfork_pid = related_pid; | |
710 | ourstatus->kind = TARGET_WAITKIND_IGNORE; | |
711 | return pid_to_ptid (pid); | |
712 | } | |
47932f85 DJ |
713 | } |
714 | ||
715 | if (hpux_has_execd (pid, &execd_pathname)) | |
716 | { | |
7d2830a3 DJ |
717 | /* On HP-UX, events associated with a vforking inferior come in |
718 | threes: a vfork event for the child (always first), followed | |
719 | a vfork event for the parent and an exec event for the child. | |
6604731b DJ |
720 | The latter two can come in either order. Make sure we get |
721 | both. */ | |
722 | if (saved_vfork_state != STATE_NONE) | |
7d2830a3 | 723 | { |
6604731b DJ |
724 | if (saved_vfork_state == STATE_GOT_CHILD) |
725 | { | |
726 | saved_vfork_state = STATE_GOT_EXEC; | |
727 | /* On HP/UX with ptrace, the child must be resumed before | |
728 | the parent vfork event is delivered. A single-step | |
729 | suffices. */ | |
730 | if (RESUME_EXECD_VFORKING_CHILD_TO_GET_PARENT_VFORK ()) | |
731 | target_resume (pid_to_ptid (pid), 1, TARGET_SIGNAL_0); | |
732 | ourstatus->kind = TARGET_WAITKIND_IGNORE; | |
733 | } | |
734 | else if (saved_vfork_state == STATE_GOT_PARENT) | |
735 | { | |
736 | saved_vfork_state = STATE_FAKE_EXEC; | |
737 | ourstatus->kind = TARGET_WAITKIND_VFORKED; | |
738 | ourstatus->value.related_pid = saved_vfork_pid; | |
739 | } | |
740 | else | |
741 | fprintf_unfiltered (gdb_stdout, | |
742 | "hppa: exec: unexpected state\n"); | |
7d2830a3 | 743 | |
6604731b | 744 | saved_child_execd_pathname = execd_pathname; |
7d2830a3 | 745 | |
7d2830a3 DJ |
746 | return inferior_ptid; |
747 | } | |
748 | ||
47932f85 DJ |
749 | /* Are we ignoring initial exec events? (This is likely because |
750 | we're in the process of starting up the inferior, and another | |
751 | (older) mechanism handles those.) If so, we'll report this | |
752 | as a regular stop, not an exec. | |
753 | */ | |
754 | if (inferior_ignoring_startup_exec_events) | |
755 | { | |
756 | inferior_ignoring_startup_exec_events--; | |
757 | } | |
758 | else | |
759 | { | |
760 | ourstatus->kind = TARGET_WAITKIND_EXECD; | |
761 | ourstatus->value.execd_pathname = execd_pathname; | |
762 | return pid_to_ptid (pid); | |
763 | } | |
764 | } | |
765 | ||
766 | /* All we must do with these is communicate their occurrence | |
767 | to wait_for_inferior... | |
768 | */ | |
769 | if (hpux_has_syscall_event (pid, &kind, &syscall_id)) | |
770 | { | |
771 | ourstatus->kind = kind; | |
772 | ourstatus->value.syscall_id = syscall_id; | |
773 | return pid_to_ptid (pid); | |
774 | } | |
775 | ||
776 | /*## } while (pid != PIDGET (inferior_ptid)); ## *//* Some other child died or stopped */ | |
777 | /* hack for thread testing */ | |
778 | } | |
779 | while ((pid != PIDGET (inferior_ptid)) && not_same_real_pid); | |
780 | /*## */ | |
781 | ||
782 | store_waitstatus (ourstatus, status); | |
783 | return pid_to_ptid (pid); | |
784 | } | |
785 | ||
c906108c SS |
786 | #if !defined (GDB_NATIVE_HPUX_11) |
787 | ||
788 | /* The following code is a substitute for the infttrace.c versions used | |
789 | with ttrace() in HPUX 11. */ | |
790 | ||
791 | /* This value is an arbitrary integer. */ | |
792 | #define PT_VERSION 123456 | |
793 | ||
794 | /* This semaphore is used to coordinate the child and parent processes | |
795 | after a fork(), and before an exec() by the child. See | |
796 | parent_attach_all for details. */ | |
797 | ||
c5aa993b JM |
798 | typedef struct |
799 | { | |
800 | int parent_channel[2]; /* Parent "talks" to [1], child "listens" to [0] */ | |
801 | int child_channel[2]; /* Child "talks" to [1], parent "listens" to [0] */ | |
802 | } | |
803 | startup_semaphore_t; | |
c906108c SS |
804 | |
805 | #define SEM_TALK (1) | |
806 | #define SEM_LISTEN (0) | |
807 | ||
c5aa993b | 808 | static startup_semaphore_t startup_semaphore; |
c906108c | 809 | |
c906108c SS |
810 | #ifdef PT_SETTRC |
811 | /* This function causes the caller's process to be traced by its | |
812 | parent. This is intended to be called after GDB forks itself, | |
813 | and before the child execs the target. | |
814 | ||
815 | Note that HP-UX ptrace is rather funky in how this is done. | |
816 | If the parent wants to get the initial exec event of a child, | |
817 | it must set the ptrace event mask of the child to include execs. | |
818 | (The child cannot do this itself.) This must be done after the | |
819 | child is forked, but before it execs. | |
820 | ||
821 | To coordinate the parent and child, we implement a semaphore using | |
822 | pipes. After SETTRC'ing itself, the child tells the parent that | |
823 | it is now traceable by the parent, and waits for the parent's | |
824 | acknowledgement. The parent can then set the child's event mask, | |
825 | and notify the child that it can now exec. | |
826 | ||
827 | (The acknowledgement by parent happens as a result of a call to | |
828 | child_acknowledge_created_inferior.) */ | |
829 | ||
830 | int | |
fba45db2 | 831 | parent_attach_all (int pid, PTRACE_ARG3_TYPE addr, int data) |
c906108c SS |
832 | { |
833 | int pt_status = 0; | |
834 | ||
835 | /* We need a memory home for a constant. */ | |
836 | int tc_magic_child = PT_VERSION; | |
837 | int tc_magic_parent = 0; | |
838 | ||
839 | /* The remainder of this function is only useful for HPUX 10.0 and | |
840 | later, as it depends upon the ability to request notification | |
841 | of specific kinds of events by the kernel. */ | |
842 | #if defined(PT_SET_EVENT_MASK) | |
843 | ||
844 | /* Notify the parent that we're potentially ready to exec(). */ | |
845 | write (startup_semaphore.child_channel[SEM_TALK], | |
b83266a0 SS |
846 | &tc_magic_child, |
847 | sizeof (tc_magic_child)); | |
c906108c SS |
848 | |
849 | /* Wait for acknowledgement from the parent. */ | |
850 | read (startup_semaphore.parent_channel[SEM_LISTEN], | |
b83266a0 SS |
851 | &tc_magic_parent, |
852 | sizeof (tc_magic_parent)); | |
c906108c | 853 | if (tc_magic_child != tc_magic_parent) |
c5aa993b | 854 | warning ("mismatched semaphore magic"); |
c906108c SS |
855 | |
856 | /* Discard our copy of the semaphore. */ | |
857 | (void) close (startup_semaphore.parent_channel[SEM_LISTEN]); | |
858 | (void) close (startup_semaphore.parent_channel[SEM_TALK]); | |
859 | (void) close (startup_semaphore.child_channel[SEM_LISTEN]); | |
860 | (void) close (startup_semaphore.child_channel[SEM_TALK]); | |
861 | #endif | |
c5aa993b | 862 | |
c906108c SS |
863 | return 0; |
864 | } | |
865 | #endif | |
866 | ||
867 | int | |
fba45db2 | 868 | hppa_require_attach (int pid) |
c906108c SS |
869 | { |
870 | int pt_status; | |
b83266a0 SS |
871 | CORE_ADDR pc; |
872 | CORE_ADDR pc_addr; | |
c906108c SS |
873 | unsigned int regs_offset; |
874 | ||
875 | /* Are we already attached? There appears to be no explicit way to | |
876 | answer this via ptrace, so we try something which should be | |
877 | innocuous if we are attached. If that fails, then we assume | |
878 | we're not attached, and so attempt to make it so. */ | |
879 | ||
880 | errno = 0; | |
881 | regs_offset = U_REGS_OFFSET; | |
882 | pc_addr = register_addr (PC_REGNUM, regs_offset); | |
883 | pc = call_ptrace (PT_READ_U, pid, (PTRACE_ARG3_TYPE) pc_addr, 0); | |
884 | ||
885 | if (errno) | |
886 | { | |
887 | errno = 0; | |
888 | pt_status = call_ptrace (PT_ATTACH, pid, (PTRACE_ARG3_TYPE) 0, 0); | |
889 | ||
890 | if (errno) | |
b83266a0 | 891 | return -1; |
c906108c SS |
892 | |
893 | /* Now we really are attached. */ | |
894 | errno = 0; | |
895 | } | |
896 | attach_flag = 1; | |
897 | return pid; | |
898 | } | |
899 | ||
900 | int | |
fba45db2 | 901 | hppa_require_detach (int pid, int signal) |
c906108c SS |
902 | { |
903 | errno = 0; | |
904 | call_ptrace (PT_DETACH, pid, (PTRACE_ARG3_TYPE) 1, signal); | |
c5aa993b | 905 | errno = 0; /* Ignore any errors. */ |
c906108c SS |
906 | return pid; |
907 | } | |
908 | ||
909 | /* Since ptrace doesn't support memory page-protection events, which | |
910 | are used to implement "hardware" watchpoints on HP-UX, these are | |
911 | dummy versions, which perform no useful work. */ | |
912 | ||
913 | void | |
fba45db2 | 914 | hppa_enable_page_protection_events (int pid) |
c906108c SS |
915 | { |
916 | } | |
917 | ||
918 | void | |
fba45db2 | 919 | hppa_disable_page_protection_events (int pid) |
c906108c SS |
920 | { |
921 | } | |
922 | ||
923 | int | |
fba45db2 | 924 | hppa_insert_hw_watchpoint (int pid, CORE_ADDR start, LONGEST len, int type) |
c906108c SS |
925 | { |
926 | error ("Hardware watchpoints not implemented on this platform."); | |
927 | } | |
928 | ||
929 | int | |
65e82032 | 930 | hppa_remove_hw_watchpoint (int pid, CORE_ADDR start, LONGEST len, int type) |
c906108c SS |
931 | { |
932 | error ("Hardware watchpoints not implemented on this platform."); | |
933 | } | |
934 | ||
935 | int | |
65e82032 | 936 | hppa_can_use_hw_watchpoint (int type, int cnt, int ot) |
c906108c SS |
937 | { |
938 | return 0; | |
939 | } | |
940 | ||
941 | int | |
fba45db2 | 942 | hppa_range_profitable_for_hw_watchpoint (int pid, CORE_ADDR start, LONGEST len) |
c906108c SS |
943 | { |
944 | error ("Hardware watchpoints not implemented on this platform."); | |
945 | } | |
946 | ||
947 | char * | |
39f77062 | 948 | hppa_pid_or_tid_to_str (ptid_t id) |
c906108c SS |
949 | { |
950 | /* In the ptrace world, there are only processes. */ | |
ed9a39eb | 951 | return child_pid_to_str (id); |
c906108c SS |
952 | } |
953 | ||
c906108c | 954 | void |
fba45db2 | 955 | hppa_ensure_vforking_parent_remains_stopped (int pid) |
c906108c SS |
956 | { |
957 | /* This assumes that the vforked parent is presently stopped, and | |
958 | that the vforked child has just delivered its first exec event. | |
959 | Calling kill() this way will cause the SIGTRAP to be delivered as | |
960 | soon as the parent is resumed, which happens as soon as the | |
961 | vforked child is resumed. See wait_for_inferior for the use of | |
962 | this function. */ | |
963 | kill (pid, SIGTRAP); | |
964 | } | |
965 | ||
966 | int | |
fba45db2 | 967 | hppa_resume_execd_vforking_child_to_get_parent_vfork (void) |
c906108c | 968 | { |
c5aa993b | 969 | return 1; /* Yes, the child must be resumed. */ |
c906108c SS |
970 | } |
971 | ||
972 | void | |
fba45db2 | 973 | require_notification_of_events (int pid) |
c906108c SS |
974 | { |
975 | #if defined(PT_SET_EVENT_MASK) | |
976 | int pt_status; | |
977 | ptrace_event_t ptrace_events; | |
c2d11a7d JM |
978 | int nsigs; |
979 | int signum; | |
c906108c SS |
980 | |
981 | /* Instruct the kernel as to the set of events we wish to be | |
982 | informed of. (This support does not exist before HPUX 10.0. | |
983 | We'll assume if PT_SET_EVENT_MASK has not been defined by | |
b83266a0 | 984 | <sys/ptrace.h>, then we're being built on pre-10.0.) */ |
c906108c SS |
985 | memset (&ptrace_events, 0, sizeof (ptrace_events)); |
986 | ||
987 | /* Note: By default, all signals are visible to us. If we wish | |
988 | the kernel to keep certain signals hidden from us, we do it | |
989 | by calling sigdelset (ptrace_events.pe_signals, signal) for | |
b83266a0 | 990 | each such signal here, before doing PT_SET_EVENT_MASK. */ |
c2d11a7d JM |
991 | /* RM: The above comment is no longer true. We start with ignoring |
992 | all signals, and then add the ones we are interested in. We could | |
993 | do it the other way: start by looking at all signals and then | |
994 | deleting the ones that we aren't interested in, except that | |
995 | multiple gdb signals may be mapped to the same host signal | |
996 | (eg. TARGET_SIGNAL_IO and TARGET_SIGNAL_POLL both get mapped to | |
997 | signal 22 on HPUX 10.20) We want to be notified if we are | |
998 | interested in either signal. */ | |
999 | sigfillset (&ptrace_events.pe_signals); | |
1000 | ||
1001 | /* RM: Let's not bother with signals we don't care about */ | |
1002 | nsigs = (int) TARGET_SIGNAL_LAST; | |
1003 | for (signum = nsigs; signum > 0; signum--) | |
1004 | { | |
1005 | if ((signal_stop_state (signum)) || | |
1006 | (signal_print_state (signum)) || | |
1007 | (!signal_pass_state (signum))) | |
1008 | { | |
1009 | if (target_signal_to_host_p (signum)) | |
1010 | sigdelset (&ptrace_events.pe_signals, | |
1011 | target_signal_to_host (signum)); | |
1012 | } | |
1013 | } | |
c906108c SS |
1014 | |
1015 | ptrace_events.pe_set_event = 0; | |
1016 | ||
1017 | ptrace_events.pe_set_event |= PTRACE_SIGNAL; | |
1018 | ptrace_events.pe_set_event |= PTRACE_EXEC; | |
1019 | ptrace_events.pe_set_event |= PTRACE_FORK; | |
1020 | ptrace_events.pe_set_event |= PTRACE_VFORK; | |
1021 | /* ??rehrauer: Add this one when we're prepared to catch it... | |
c5aa993b JM |
1022 | ptrace_events.pe_set_event |= PTRACE_EXIT; |
1023 | */ | |
c906108c SS |
1024 | |
1025 | errno = 0; | |
1026 | pt_status = call_ptrace (PT_SET_EVENT_MASK, | |
c5aa993b JM |
1027 | pid, |
1028 | (PTRACE_ARG3_TYPE) & ptrace_events, | |
1029 | sizeof (ptrace_events)); | |
c906108c SS |
1030 | if (errno) |
1031 | perror_with_name ("ptrace"); | |
1032 | if (pt_status < 0) | |
1033 | return; | |
1034 | #endif | |
1035 | } | |
1036 | ||
1037 | void | |
fba45db2 | 1038 | require_notification_of_exec_events (int pid) |
c906108c SS |
1039 | { |
1040 | #if defined(PT_SET_EVENT_MASK) | |
1041 | int pt_status; | |
1042 | ptrace_event_t ptrace_events; | |
1043 | ||
1044 | /* Instruct the kernel as to the set of events we wish to be | |
1045 | informed of. (This support does not exist before HPUX 10.0. | |
1046 | We'll assume if PT_SET_EVENT_MASK has not been defined by | |
b83266a0 | 1047 | <sys/ptrace.h>, then we're being built on pre-10.0.) */ |
c906108c SS |
1048 | memset (&ptrace_events, 0, sizeof (ptrace_events)); |
1049 | ||
1050 | /* Note: By default, all signals are visible to us. If we wish | |
1051 | the kernel to keep certain signals hidden from us, we do it | |
1052 | by calling sigdelset (ptrace_events.pe_signals, signal) for | |
b83266a0 | 1053 | each such signal here, before doing PT_SET_EVENT_MASK. */ |
c906108c SS |
1054 | sigemptyset (&ptrace_events.pe_signals); |
1055 | ||
1056 | ptrace_events.pe_set_event = 0; | |
1057 | ||
1058 | ptrace_events.pe_set_event |= PTRACE_EXEC; | |
1059 | /* ??rehrauer: Add this one when we're prepared to catch it... | |
c5aa993b JM |
1060 | ptrace_events.pe_set_event |= PTRACE_EXIT; |
1061 | */ | |
c906108c SS |
1062 | |
1063 | errno = 0; | |
1064 | pt_status = call_ptrace (PT_SET_EVENT_MASK, | |
c5aa993b JM |
1065 | pid, |
1066 | (PTRACE_ARG3_TYPE) & ptrace_events, | |
1067 | sizeof (ptrace_events)); | |
c906108c SS |
1068 | if (errno) |
1069 | perror_with_name ("ptrace"); | |
1070 | if (pt_status < 0) | |
1071 | return; | |
1072 | #endif | |
1073 | } | |
1074 | ||
1075 | /* This function is called by the parent process, with pid being the | |
1076 | ID of the child process, after the debugger has forked. */ | |
1077 | ||
1078 | void | |
fba45db2 | 1079 | child_acknowledge_created_inferior (int pid) |
c906108c SS |
1080 | { |
1081 | /* We need a memory home for a constant. */ | |
1082 | int tc_magic_parent = PT_VERSION; | |
1083 | int tc_magic_child = 0; | |
1084 | ||
b83266a0 SS |
1085 | /* The remainder of this function is only useful for HPUX 10.0 and |
1086 | later, as it depends upon the ability to request notification | |
1087 | of specific kinds of events by the kernel. */ | |
1088 | #if defined(PT_SET_EVENT_MASK) | |
c906108c SS |
1089 | /* Wait for the child to tell us that it has forked. */ |
1090 | read (startup_semaphore.child_channel[SEM_LISTEN], | |
b83266a0 | 1091 | &tc_magic_child, |
c5aa993b | 1092 | sizeof (tc_magic_child)); |
c906108c SS |
1093 | |
1094 | /* Notify the child that it can exec. | |
1095 | ||
1096 | In the infttrace.c variant of this function, we set the child's | |
1097 | event mask after the fork but before the exec. In the ptrace | |
1098 | world, it seems we can't set the event mask until after the exec. */ | |
c906108c | 1099 | write (startup_semaphore.parent_channel[SEM_TALK], |
b83266a0 SS |
1100 | &tc_magic_parent, |
1101 | sizeof (tc_magic_parent)); | |
c906108c SS |
1102 | |
1103 | /* We'd better pause a bit before trying to set the event mask, | |
1104 | though, to ensure that the exec has happened. We don't want to | |
1105 | wait() on the child, because that'll screw up the upper layers | |
1106 | of gdb's execution control that expect to see the exec event. | |
1107 | ||
1108 | After an exec, the child is no longer executing gdb code. Hence, | |
1109 | we can't have yet another synchronization via the pipes. We'll | |
1110 | just sleep for a second, and hope that's enough delay... */ | |
c906108c SS |
1111 | sleep (1); |
1112 | ||
1113 | /* Instruct the kernel as to the set of events we wish to be | |
1114 | informed of. */ | |
c906108c SS |
1115 | require_notification_of_exec_events (pid); |
1116 | ||
1117 | /* Discard our copy of the semaphore. */ | |
1118 | (void) close (startup_semaphore.parent_channel[SEM_LISTEN]); | |
1119 | (void) close (startup_semaphore.parent_channel[SEM_TALK]); | |
1120 | (void) close (startup_semaphore.child_channel[SEM_LISTEN]); | |
1121 | (void) close (startup_semaphore.child_channel[SEM_TALK]); | |
b83266a0 | 1122 | #endif |
c906108c SS |
1123 | } |
1124 | ||
1125 | void | |
39f77062 | 1126 | child_post_startup_inferior (ptid_t ptid) |
c906108c | 1127 | { |
39f77062 | 1128 | require_notification_of_events (PIDGET (ptid)); |
c906108c SS |
1129 | } |
1130 | ||
1131 | void | |
fba45db2 | 1132 | child_post_attach (int pid) |
c906108c SS |
1133 | { |
1134 | require_notification_of_events (pid); | |
1135 | } | |
1136 | ||
1137 | int | |
fba45db2 | 1138 | child_insert_fork_catchpoint (int pid) |
c906108c SS |
1139 | { |
1140 | /* This request is only available on HPUX 10.0 and later. */ | |
1141 | #if !defined(PT_SET_EVENT_MASK) | |
1142 | error ("Unable to catch forks prior to HPUX 10.0"); | |
1143 | #else | |
1144 | /* Enable reporting of fork events from the kernel. */ | |
1145 | /* ??rehrauer: For the moment, we're always enabling these events, | |
b83266a0 | 1146 | and just ignoring them if there's no catchpoint to catch them. */ |
c906108c SS |
1147 | return 0; |
1148 | #endif | |
1149 | } | |
1150 | ||
1151 | int | |
fba45db2 | 1152 | child_remove_fork_catchpoint (int pid) |
c906108c SS |
1153 | { |
1154 | /* This request is only available on HPUX 10.0 and later. */ | |
1155 | #if !defined(PT_SET_EVENT_MASK) | |
1156 | error ("Unable to catch forks prior to HPUX 10.0"); | |
1157 | #else | |
1158 | /* Disable reporting of fork events from the kernel. */ | |
1159 | /* ??rehrauer: For the moment, we're always enabling these events, | |
1160 | and just ignoring them if there's no catchpoint to catch them. */ | |
1161 | return 0; | |
1162 | #endif | |
1163 | } | |
1164 | ||
1165 | int | |
fba45db2 | 1166 | child_insert_vfork_catchpoint (int pid) |
c906108c SS |
1167 | { |
1168 | /* This request is only available on HPUX 10.0 and later. */ | |
1169 | #if !defined(PT_SET_EVENT_MASK) | |
1170 | error ("Unable to catch vforks prior to HPUX 10.0"); | |
1171 | #else | |
1172 | /* Enable reporting of vfork events from the kernel. */ | |
1173 | /* ??rehrauer: For the moment, we're always enabling these events, | |
1174 | and just ignoring them if there's no catchpoint to catch them. */ | |
1175 | return 0; | |
1176 | #endif | |
1177 | } | |
1178 | ||
1179 | int | |
fba45db2 | 1180 | child_remove_vfork_catchpoint (int pid) |
c906108c SS |
1181 | { |
1182 | /* This request is only available on HPUX 10.0 and later. */ | |
1183 | #if !defined(PT_SET_EVENT_MASK) | |
1184 | error ("Unable to catch vforks prior to HPUX 10.0"); | |
1185 | #else | |
1186 | /* Disable reporting of vfork events from the kernel. */ | |
1187 | /* ??rehrauer: For the moment, we're always enabling these events, | |
1188 | and just ignoring them if there's no catchpoint to catch them. */ | |
1189 | return 0; | |
1190 | #endif | |
1191 | } | |
1192 | ||
1193 | int | |
47932f85 | 1194 | hpux_has_forked (int pid, int *childpid) |
c906108c SS |
1195 | { |
1196 | /* This request is only available on HPUX 10.0 and later. */ | |
1197 | #if !defined(PT_GET_PROCESS_STATE) | |
1198 | *childpid = 0; | |
1199 | return 0; | |
1200 | #else | |
1201 | int pt_status; | |
c5aa993b | 1202 | ptrace_state_t ptrace_state; |
c906108c SS |
1203 | |
1204 | errno = 0; | |
1205 | pt_status = call_ptrace (PT_GET_PROCESS_STATE, | |
b83266a0 | 1206 | pid, |
c5aa993b | 1207 | (PTRACE_ARG3_TYPE) & ptrace_state, |
b83266a0 | 1208 | sizeof (ptrace_state)); |
c906108c SS |
1209 | if (errno) |
1210 | perror_with_name ("ptrace"); | |
1211 | if (pt_status < 0) | |
1212 | return 0; | |
1213 | ||
1214 | if (ptrace_state.pe_report_event & PTRACE_FORK) | |
1215 | { | |
1216 | *childpid = ptrace_state.pe_other_pid; | |
1217 | return 1; | |
1218 | } | |
1219 | ||
1220 | return 0; | |
1221 | #endif | |
1222 | } | |
1223 | ||
1224 | int | |
47932f85 | 1225 | hpux_has_vforked (int pid, int *childpid) |
c906108c SS |
1226 | { |
1227 | /* This request is only available on HPUX 10.0 and later. */ | |
1228 | #if !defined(PT_GET_PROCESS_STATE) | |
1229 | *childpid = 0; | |
1230 | return 0; | |
1231 | ||
1232 | #else | |
1233 | int pt_status; | |
c5aa993b | 1234 | ptrace_state_t ptrace_state; |
c906108c SS |
1235 | |
1236 | errno = 0; | |
1237 | pt_status = call_ptrace (PT_GET_PROCESS_STATE, | |
b83266a0 | 1238 | pid, |
c5aa993b | 1239 | (PTRACE_ARG3_TYPE) & ptrace_state, |
b83266a0 | 1240 | sizeof (ptrace_state)); |
c906108c SS |
1241 | if (errno) |
1242 | perror_with_name ("ptrace"); | |
1243 | if (pt_status < 0) | |
1244 | return 0; | |
1245 | ||
1246 | if (ptrace_state.pe_report_event & PTRACE_VFORK) | |
1247 | { | |
1248 | *childpid = ptrace_state.pe_other_pid; | |
1249 | return 1; | |
1250 | } | |
1251 | ||
1252 | return 0; | |
1253 | #endif | |
1254 | } | |
1255 | ||
c906108c | 1256 | int |
fba45db2 | 1257 | child_insert_exec_catchpoint (int pid) |
c906108c | 1258 | { |
b83266a0 | 1259 | /* This request is only available on HPUX 10.0 and later. */ |
c906108c SS |
1260 | #if !defined(PT_SET_EVENT_MASK) |
1261 | error ("Unable to catch execs prior to HPUX 10.0"); | |
1262 | ||
1263 | #else | |
b83266a0 | 1264 | /* Enable reporting of exec events from the kernel. */ |
c906108c | 1265 | /* ??rehrauer: For the moment, we're always enabling these events, |
b83266a0 | 1266 | and just ignoring them if there's no catchpoint to catch them. */ |
c906108c SS |
1267 | return 0; |
1268 | #endif | |
1269 | } | |
1270 | ||
1271 | int | |
fba45db2 | 1272 | child_remove_exec_catchpoint (int pid) |
c906108c | 1273 | { |
b83266a0 | 1274 | /* This request is only available on HPUX 10.0 and later. */ |
c906108c SS |
1275 | #if !defined(PT_SET_EVENT_MASK) |
1276 | error ("Unable to catch execs prior to HPUX 10.0"); | |
1277 | ||
1278 | #else | |
1279 | /* Disable reporting of exec events from the kernel. */ | |
1280 | /* ??rehrauer: For the moment, we're always enabling these events, | |
b83266a0 | 1281 | and just ignoring them if there's no catchpoint to catch them. */ |
c906108c SS |
1282 | return 0; |
1283 | #endif | |
1284 | } | |
1285 | ||
1286 | int | |
47932f85 | 1287 | hpux_has_execd (int pid, char **execd_pathname) |
c906108c | 1288 | { |
b83266a0 | 1289 | /* This request is only available on HPUX 10.0 and later. */ |
c906108c SS |
1290 | #if !defined(PT_GET_PROCESS_STATE) |
1291 | *execd_pathname = NULL; | |
1292 | return 0; | |
1293 | ||
1294 | #else | |
1295 | int pt_status; | |
c5aa993b | 1296 | ptrace_state_t ptrace_state; |
c906108c SS |
1297 | |
1298 | errno = 0; | |
1299 | pt_status = call_ptrace (PT_GET_PROCESS_STATE, | |
b83266a0 | 1300 | pid, |
c5aa993b | 1301 | (PTRACE_ARG3_TYPE) & ptrace_state, |
b83266a0 | 1302 | sizeof (ptrace_state)); |
c906108c SS |
1303 | if (errno) |
1304 | perror_with_name ("ptrace"); | |
1305 | if (pt_status < 0) | |
1306 | return 0; | |
1307 | ||
1308 | if (ptrace_state.pe_report_event & PTRACE_EXEC) | |
1309 | { | |
c5aa993b | 1310 | char *exec_file = target_pid_to_exec_file (pid); |
c906108c SS |
1311 | *execd_pathname = savestring (exec_file, strlen (exec_file)); |
1312 | return 1; | |
1313 | } | |
1314 | ||
1315 | return 0; | |
1316 | #endif | |
1317 | } | |
1318 | ||
1319 | int | |
fba45db2 | 1320 | child_reported_exec_events_per_exec_call (void) |
c906108c | 1321 | { |
c5aa993b | 1322 | return 2; /* ptrace reports the event twice per call. */ |
c906108c SS |
1323 | } |
1324 | ||
1325 | int | |
47932f85 | 1326 | hpux_has_syscall_event (int pid, enum target_waitkind *kind, int *syscall_id) |
c906108c SS |
1327 | { |
1328 | /* This request is only available on HPUX 10.30 and later, via | |
1329 | the ttrace interface. */ | |
1330 | ||
1331 | *kind = TARGET_WAITKIND_SPURIOUS; | |
1332 | *syscall_id = -1; | |
1333 | return 0; | |
1334 | } | |
1335 | ||
1336 | char * | |
fba45db2 | 1337 | child_pid_to_exec_file (int pid) |
c906108c | 1338 | { |
b83266a0 | 1339 | static char exec_file_buffer[1024]; |
c906108c | 1340 | int pt_status; |
b83266a0 SS |
1341 | CORE_ADDR top_of_stack; |
1342 | char four_chars[4]; | |
c906108c SS |
1343 | int name_index; |
1344 | int i; | |
39f77062 | 1345 | ptid_t saved_inferior_ptid; |
52287340 | 1346 | int done; |
c5aa993b | 1347 | |
c906108c SS |
1348 | #ifdef PT_GET_PROCESS_PATHNAME |
1349 | /* As of 10.x HP-UX, there's an explicit request to get the pathname. */ | |
1350 | pt_status = call_ptrace (PT_GET_PROCESS_PATHNAME, | |
b83266a0 SS |
1351 | pid, |
1352 | (PTRACE_ARG3_TYPE) exec_file_buffer, | |
1353 | sizeof (exec_file_buffer) - 1); | |
c906108c SS |
1354 | if (pt_status == 0) |
1355 | return exec_file_buffer; | |
1356 | #endif | |
1357 | ||
1358 | /* It appears that this request is broken prior to 10.30. | |
1359 | If it fails, try a really, truly amazingly gross hack | |
1360 | that DDE uses, of pawing through the process' data | |
1361 | segment to find the pathname. */ | |
1362 | ||
1363 | top_of_stack = 0x7b03a000; | |
1364 | name_index = 0; | |
1365 | done = 0; | |
1366 | ||
39f77062 KB |
1367 | /* On the chance that pid != inferior_ptid, set inferior_ptid |
1368 | to pid, so that (grrrr!) implicit uses of inferior_ptid get | |
c906108c SS |
1369 | the right id. */ |
1370 | ||
39f77062 KB |
1371 | saved_inferior_ptid = inferior_ptid; |
1372 | inferior_ptid = pid_to_ptid (pid); | |
c906108c SS |
1373 | |
1374 | /* Try to grab a null-terminated string. */ | |
c5aa993b | 1375 | while (!done) |
c906108c SS |
1376 | { |
1377 | if (target_read_memory (top_of_stack, four_chars, 4) != 0) | |
1378 | { | |
39f77062 | 1379 | inferior_ptid = saved_inferior_ptid; |
c906108c SS |
1380 | return NULL; |
1381 | } | |
1382 | for (i = 0; i < 4; i++) | |
1383 | { | |
1384 | exec_file_buffer[name_index++] = four_chars[i]; | |
1385 | done = (four_chars[i] == '\0'); | |
1386 | if (done) | |
1387 | break; | |
1388 | } | |
1389 | top_of_stack += 4; | |
1390 | } | |
1391 | ||
1392 | if (exec_file_buffer[0] == '\0') | |
1393 | { | |
39f77062 | 1394 | inferior_ptid = saved_inferior_ptid; |
c906108c SS |
1395 | return NULL; |
1396 | } | |
1397 | ||
39f77062 | 1398 | inferior_ptid = saved_inferior_ptid; |
c906108c SS |
1399 | return exec_file_buffer; |
1400 | } | |
1401 | ||
1402 | void | |
fba45db2 | 1403 | pre_fork_inferior (void) |
c906108c SS |
1404 | { |
1405 | int status; | |
1406 | ||
1407 | status = pipe (startup_semaphore.parent_channel); | |
1408 | if (status < 0) | |
1409 | { | |
1410 | warning ("error getting parent pipe for startup semaphore"); | |
1411 | return; | |
1412 | } | |
1413 | ||
1414 | status = pipe (startup_semaphore.child_channel); | |
1415 | if (status < 0) | |
1416 | { | |
1417 | warning ("error getting child pipe for startup semaphore"); | |
1418 | return; | |
1419 | } | |
1420 | } | |
c906108c | 1421 | \f |
c5aa993b | 1422 | |
c906108c SS |
1423 | /* Check to see if the given thread is alive. |
1424 | ||
1425 | This is a no-op, as ptrace doesn't support threads, so we just | |
1426 | return "TRUE". */ | |
1427 | ||
1428 | int | |
39f77062 | 1429 | child_thread_alive (ptid_t ptid) |
c906108c | 1430 | { |
c5aa993b | 1431 | return 1; |
c906108c SS |
1432 | } |
1433 | ||
1434 | #endif /* ! GDB_NATIVE_HPUX_11 */ |