Commit | Line | Data |
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c906108c | 1 | /* Low level Unix child interface to ptrace, for GDB when running under Unix. |
0a65a603 | 2 | Copyright 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, |
2689df5a | 3 | 1998, 1999, 2000, 2001, 2002, 2004 |
c906108c SS |
4 | Free Software Foundation, Inc. |
5 | ||
c5aa993b | 6 | This file is part of GDB. |
c906108c | 7 | |
c5aa993b JM |
8 | This program is free software; you can redistribute it and/or modify |
9 | it under the terms of the GNU General Public License as published by | |
10 | the Free Software Foundation; either version 2 of the License, or | |
11 | (at your option) any later version. | |
c906108c | 12 | |
c5aa993b JM |
13 | This program is distributed in the hope that it will be useful, |
14 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | GNU General Public License for more details. | |
c906108c | 17 | |
c5aa993b JM |
18 | You should have received a copy of the GNU General Public License |
19 | along with this program; if not, write to the Free Software | |
20 | Foundation, Inc., 59 Temple Place - Suite 330, | |
21 | Boston, MA 02111-1307, USA. */ | |
c906108c SS |
22 | |
23 | #include "defs.h" | |
8cbba7c8 | 24 | #include "command.h" |
c906108c | 25 | #include "frame.h" |
8cbba7c8 | 26 | #include "gdbcore.h" |
c906108c | 27 | #include "inferior.h" |
4e052eda | 28 | #include "regcache.h" |
8cbba7c8 | 29 | #include "target.h" |
ed9a39eb | 30 | |
8cbba7c8 | 31 | #include "gdb_assert.h" |
03f2053f | 32 | #include "gdb_wait.h" |
8cbba7c8 | 33 | #include "gdb_string.h" |
c906108c | 34 | |
c906108c | 35 | #include <sys/param.h> |
4b14d3e4 | 36 | #include "gdb_dirent.h" |
c906108c SS |
37 | #include <signal.h> |
38 | #include <sys/ioctl.h> | |
39 | ||
11003ae3 | 40 | #include "gdb_ptrace.h" |
c906108c | 41 | |
c0ccb908 | 42 | #ifdef HAVE_SYS_FILE_H |
c906108c SS |
43 | #include <sys/file.h> |
44 | #endif | |
652fc137 | 45 | |
c906108c SS |
46 | #if !defined (FETCH_INFERIOR_REGISTERS) |
47 | #include <sys/user.h> /* Probably need to poke the user structure */ | |
c906108c SS |
48 | #endif /* !FETCH_INFERIOR_REGISTERS */ |
49 | ||
50 | #if !defined (CHILD_XFER_MEMORY) | |
a14ed312 | 51 | static void udot_info (char *, int); |
c906108c SS |
52 | #endif |
53 | ||
a14ed312 | 54 | void _initialize_infptrace (void); |
c906108c | 55 | \f |
c5aa993b | 56 | |
c906108c SS |
57 | /* This function simply calls ptrace with the given arguments. |
58 | It exists so that all calls to ptrace are isolated in this | |
59 | machine-dependent file. */ | |
60 | int | |
f8707cac | 61 | call_ptrace (int request, int pid, PTRACE_ARG3_TYPE addr, int data) |
c906108c SS |
62 | { |
63 | int pt_status = 0; | |
64 | ||
65 | #if 0 | |
66 | int saved_errno; | |
67 | ||
68 | printf ("call_ptrace(request=%d, pid=%d, addr=0x%x, data=0x%x)", | |
69 | request, pid, addr, data); | |
70 | #endif | |
71 | #if defined(PT_SETTRC) | |
72 | /* If the parent can be told to attach to us, try to do it. */ | |
c5aa993b JM |
73 | if (request == PT_SETTRC) |
74 | { | |
75 | errno = 0; | |
daa98270 | 76 | #ifndef PTRACE_TYPE_ARG5 |
ed9a39eb JM |
77 | pt_status = ptrace (PT_SETTRC, pid, addr, data); |
78 | #else | |
c5aa993b JM |
79 | /* Deal with HPUX 8.0 braindamage. We never use the |
80 | calls which require the fifth argument. */ | |
ed9a39eb | 81 | pt_status = ptrace (PT_SETTRC, pid, addr, data, 0); |
c906108c | 82 | #endif |
c5aa993b JM |
83 | if (errno) |
84 | perror_with_name ("ptrace"); | |
c906108c | 85 | #if 0 |
c5aa993b | 86 | printf (" = %d\n", pt_status); |
c906108c | 87 | #endif |
c5aa993b JM |
88 | if (pt_status < 0) |
89 | return pt_status; | |
90 | else | |
91 | return parent_attach_all (pid, addr, data); | |
92 | } | |
c906108c SS |
93 | #endif |
94 | ||
95 | #if defined(PT_CONTIN1) | |
96 | /* On HPUX, PT_CONTIN1 is a form of continue that preserves pending | |
97 | signals. If it's available, use it. */ | |
98 | if (request == PT_CONTINUE) | |
99 | request = PT_CONTIN1; | |
100 | #endif | |
101 | ||
102 | #if defined(PT_SINGLE1) | |
103 | /* On HPUX, PT_SINGLE1 is a form of step that preserves pending | |
104 | signals. If it's available, use it. */ | |
105 | if (request == PT_STEP) | |
106 | request = PT_SINGLE1; | |
107 | #endif | |
108 | ||
109 | #if 0 | |
110 | saved_errno = errno; | |
111 | errno = 0; | |
112 | #endif | |
daa98270 | 113 | #ifndef PTRACE_TYPE_ARG5 |
ed9a39eb JM |
114 | pt_status = ptrace (request, pid, addr, data); |
115 | #else | |
c5aa993b JM |
116 | /* Deal with HPUX 8.0 braindamage. We never use the |
117 | calls which require the fifth argument. */ | |
ed9a39eb | 118 | pt_status = ptrace (request, pid, addr, data, 0); |
c906108c | 119 | #endif |
ed9a39eb | 120 | |
c906108c SS |
121 | #if 0 |
122 | if (errno) | |
123 | printf (" [errno = %d]", errno); | |
124 | ||
125 | errno = saved_errno; | |
126 | printf (" = 0x%x\n", pt_status); | |
127 | #endif | |
128 | return pt_status; | |
129 | } | |
130 | ||
131 | ||
daa98270 | 132 | #if defined (DEBUG_PTRACE) || defined (PTRACE_TYPE_ARG5) |
c906108c SS |
133 | /* For the rest of the file, use an extra level of indirection */ |
134 | /* This lets us breakpoint usefully on call_ptrace. */ | |
135 | #define ptrace call_ptrace | |
136 | #endif | |
137 | ||
138 | /* Wait for a process to finish, possibly running a target-specific | |
139 | hook before returning. */ | |
140 | ||
141 | int | |
39f77062 | 142 | ptrace_wait (ptid_t ptid, int *status) |
c906108c SS |
143 | { |
144 | int wstate; | |
145 | ||
146 | wstate = wait (status); | |
39f77062 | 147 | target_post_wait (pid_to_ptid (wstate), *status); |
c906108c SS |
148 | return wstate; |
149 | } | |
150 | ||
adbef1f0 AC |
151 | #ifndef DEPRECATED_KILL_INFERIOR |
152 | /* NOTE: cagney/2004-09-12: Instead of definining this macro, code | |
153 | should call inf_ptrace_target to get a basic ptrace target and then | |
154 | locally update any necessary methods. See ppcnbsd-nat.c. */ | |
155 | ||
c906108c | 156 | void |
fba45db2 | 157 | kill_inferior (void) |
c906108c SS |
158 | { |
159 | int status; | |
39f77062 | 160 | int pid = PIDGET (inferior_ptid); |
c906108c | 161 | |
39f77062 | 162 | if (pid == 0) |
c906108c SS |
163 | return; |
164 | ||
165 | /* This once used to call "kill" to kill the inferior just in case | |
166 | the inferior was still running. As others have noted in the past | |
167 | (kingdon) there shouldn't be any way to get here if the inferior | |
168 | is still running -- else there's a major problem elsewere in gdb | |
169 | and it needs to be fixed. | |
170 | ||
171 | The kill call causes problems under hpux10, so it's been removed; | |
172 | if this causes problems we'll deal with them as they arise. */ | |
655c5466 | 173 | ptrace (PT_KILL, pid, (PTRACE_TYPE_ARG3) 0, 0); |
39f77062 | 174 | ptrace_wait (null_ptid, &status); |
c906108c SS |
175 | target_mourn_inferior (); |
176 | } | |
adbef1f0 | 177 | #endif /* DEPRECATED_KILL_INFERIOR */ |
c906108c | 178 | |
adbef1f0 AC |
179 | #ifndef DEPRECATED_CHILD_RESUME |
180 | /* NOTE: cagney/2004-09-12: Instead of definining this macro, code | |
181 | should call inf_ptrace_target to get a basic ptrace target and then | |
182 | locally update any necessary methods. See ppcnbsd-nat.c. */ | |
c906108c SS |
183 | |
184 | /* Resume execution of the inferior process. | |
185 | If STEP is nonzero, single-step it. | |
186 | If SIGNAL is nonzero, give it that signal. */ | |
187 | ||
188 | void | |
39f77062 | 189 | child_resume (ptid_t ptid, int step, enum target_signal signal) |
c906108c | 190 | { |
8cbba7c8 | 191 | int request = PT_CONTINUE; |
39f77062 KB |
192 | int pid = PIDGET (ptid); |
193 | ||
c906108c SS |
194 | if (pid == -1) |
195 | /* Resume all threads. */ | |
196 | /* I think this only gets used in the non-threaded case, where "resume | |
39f77062 KB |
197 | all threads" and "resume inferior_ptid" are the same. */ |
198 | pid = PIDGET (inferior_ptid); | |
c906108c | 199 | |
c906108c SS |
200 | if (step) |
201 | { | |
8cbba7c8 MK |
202 | /* If this system does not support PT_STEP, a higher level |
203 | function will have called single_step() to transmute the step | |
204 | request into a continue request (by setting breakpoints on | |
205 | all possible successor instructions), so we don't have to | |
206 | worry about that here. */ | |
207 | ||
208 | gdb_assert (!SOFTWARE_SINGLE_STEP_P ()); | |
209 | request = PT_STEP; | |
c906108c | 210 | } |
c906108c | 211 | |
8cbba7c8 MK |
212 | /* An address of (PTRACE_TYPE_ARG3)1 tells ptrace to continue from |
213 | where it was. If GDB wanted it to start some other way, we have | |
214 | already written a new PC value to the child. */ | |
215 | ||
216 | errno = 0; | |
217 | ptrace (request, pid, (PTRACE_TYPE_ARG3)1, target_signal_to_host (signal)); | |
218 | if (errno != 0) | |
219 | perror_with_name ("ptrace"); | |
c906108c | 220 | } |
adbef1f0 | 221 | #endif /* DEPRECATED_CHILD_RESUME */ |
c906108c | 222 | \f |
8cbba7c8 | 223 | |
c906108c | 224 | /* Start debugging the process whose number is PID. */ |
8cbba7c8 | 225 | |
c906108c | 226 | int |
fba45db2 | 227 | attach (int pid) |
c906108c | 228 | { |
d966f0cb | 229 | #ifdef PT_ATTACH |
11003ae3 | 230 | errno = 0; |
655c5466 | 231 | ptrace (PT_ATTACH, pid, (PTRACE_TYPE_ARG3) 0, 0); |
8cbba7c8 | 232 | if (errno != 0) |
c906108c SS |
233 | perror_with_name ("ptrace"); |
234 | attach_flag = 1; | |
235 | return pid; | |
d966f0cb AC |
236 | #else |
237 | error ("This system does not support attaching to a process"); | |
238 | #endif | |
c906108c SS |
239 | } |
240 | ||
8cbba7c8 MK |
241 | /* Stop debugging the process whose number is PID and continue it with |
242 | signal number SIGNAL. SIGNAL = 0 means just continue it. */ | |
c906108c SS |
243 | |
244 | void | |
fba45db2 | 245 | detach (int signal) |
c906108c | 246 | { |
d966f0cb | 247 | #ifdef PT_DETACH |
8cbba7c8 MK |
248 | int pid = PIDGET (inferior_ptid); |
249 | ||
11003ae3 | 250 | errno = 0; |
8cbba7c8 MK |
251 | ptrace (PT_DETACH, pid, (PTRACE_TYPE_ARG3) 1, signal); |
252 | if (errno != 0) | |
253 | perror_with_name ("ptrace"); | |
c906108c | 254 | attach_flag = 0; |
d966f0cb AC |
255 | #else |
256 | error ("This system does not support detaching from a process"); | |
257 | #endif | |
c906108c | 258 | } |
c906108c | 259 | \f |
c906108c | 260 | |
652fc137 | 261 | #ifndef FETCH_INFERIOR_REGISTERS |
c906108c | 262 | |
652fc137 MK |
263 | /* U_REGS_OFFSET is the offset of the registers within the u area. */ |
264 | #ifndef U_REGS_OFFSET | |
265 | ||
266 | #ifndef offsetof | |
c906108c SS |
267 | #define offsetof(TYPE, MEMBER) ((unsigned long) &((TYPE *)0)->MEMBER) |
268 | #endif | |
269 | ||
c906108c | 270 | #define U_REGS_OFFSET \ |
39f77062 | 271 | ptrace (PT_READ_U, PIDGET (inferior_ptid), \ |
655c5466 | 272 | (PTRACE_TYPE_ARG3) (offsetof (struct user, u_ar0)), 0) \ |
c906108c SS |
273 | - KERNEL_U_ADDR |
274 | #endif | |
275 | ||
652fc137 | 276 | /* Fetch register REGNUM from the inferior. */ |
c906108c SS |
277 | |
278 | static void | |
652fc137 | 279 | fetch_register (int regnum) |
c906108c | 280 | { |
652fc137 MK |
281 | CORE_ADDR addr; |
282 | size_t size; | |
283 | PTRACE_TYPE_RET *buf; | |
284 | int tid, i; | |
285 | ||
286 | if (CANNOT_FETCH_REGISTER (regnum)) | |
c906108c | 287 | { |
652fc137 | 288 | regcache_raw_supply (current_regcache, regnum, NULL); |
c906108c SS |
289 | return; |
290 | } | |
291 | ||
652fc137 MK |
292 | /* GNU/Linux LWP ID's are process ID's. */ |
293 | tid = TIDGET (inferior_ptid); | |
294 | if (tid == 0) | |
295 | tid = PIDGET (inferior_ptid); /* Not a threaded program. */ | |
296 | ||
297 | /* This isn't really an address. But ptrace thinks of it as one. */ | |
298 | addr = register_addr (regnum, U_REGS_OFFSET); | |
299 | size = register_size (current_gdbarch, regnum); | |
ed9a39eb | 300 | |
652fc137 MK |
301 | gdb_assert ((size % sizeof (PTRACE_TYPE_RET)) == 0); |
302 | buf = alloca (size); | |
c906108c | 303 | |
652fc137 MK |
304 | /* Read the register contents from the inferior a chuck at the time. */ |
305 | for (i = 0; i < size / sizeof (PTRACE_TYPE_RET); i++) | |
c906108c SS |
306 | { |
307 | errno = 0; | |
652fc137 | 308 | buf[i] = ptrace (PT_READ_U, tid, (PTRACE_TYPE_ARG3) addr, 0); |
c906108c | 309 | if (errno != 0) |
652fc137 MK |
310 | error ("Couldn't read register %s (#%d): %s.", REGISTER_NAME (regnum), |
311 | regnum, safe_strerror (errno)); | |
312 | ||
313 | addr += sizeof (PTRACE_TYPE_RET); | |
c906108c | 314 | } |
652fc137 | 315 | regcache_raw_supply (current_regcache, regnum, buf); |
c906108c SS |
316 | } |
317 | ||
652fc137 MK |
318 | /* Fetch register REGNUM from the inferior. If REGNUM is -1, do this |
319 | for all registers. */ | |
c906108c SS |
320 | |
321 | void | |
652fc137 | 322 | fetch_inferior_registers (int regnum) |
c906108c | 323 | { |
652fc137 MK |
324 | if (regnum == -1) |
325 | for (regnum = 0; regnum < NUM_REGS; regnum++) | |
326 | fetch_register (regnum); | |
c906108c | 327 | else |
652fc137 | 328 | fetch_register (regnum); |
c906108c SS |
329 | } |
330 | ||
652fc137 | 331 | /* Store register REGNUM into the inferior. */ |
c906108c SS |
332 | |
333 | static void | |
652fc137 | 334 | store_register (int regnum) |
c906108c | 335 | { |
652fc137 MK |
336 | CORE_ADDR addr; |
337 | size_t size; | |
338 | PTRACE_TYPE_RET *buf; | |
339 | int tid, i; | |
c906108c | 340 | |
652fc137 MK |
341 | if (CANNOT_STORE_REGISTER (regnum)) |
342 | return; | |
ed9a39eb | 343 | |
652fc137 MK |
344 | /* GNU/Linux LWP ID's are process ID's. */ |
345 | tid = TIDGET (inferior_ptid); | |
346 | if (tid == 0) | |
347 | tid = PIDGET (inferior_ptid); /* Not a threaded program. */ | |
c906108c | 348 | |
652fc137 MK |
349 | /* This isn't really an address. But ptrace thinks of it as one. */ |
350 | addr = register_addr (regnum, U_REGS_OFFSET); | |
351 | size = register_size (current_gdbarch, regnum); | |
8b6f1f3a | 352 | |
652fc137 MK |
353 | gdb_assert ((size % sizeof (PTRACE_TYPE_RET)) == 0); |
354 | buf = alloca (size); | |
8b6f1f3a | 355 | |
652fc137 MK |
356 | /* Write the register contents into the inferior a chunk at the time. */ |
357 | regcache_raw_collect (current_regcache, regnum, buf); | |
358 | for (i = 0; i < size / sizeof (PTRACE_TYPE_RET); i++) | |
c906108c SS |
359 | { |
360 | errno = 0; | |
652fc137 | 361 | ptrace (PT_WRITE_U, tid, (PTRACE_TYPE_ARG3) addr, buf[i]); |
c906108c | 362 | if (errno != 0) |
652fc137 MK |
363 | error ("Couldn't write register %s (#%d): %s.", REGISTER_NAME (regnum), |
364 | regnum, safe_strerror (errno)); | |
365 | ||
366 | addr += sizeof (PTRACE_TYPE_RET); | |
c906108c SS |
367 | } |
368 | } | |
369 | ||
652fc137 MK |
370 | /* Store register REGNUM back into the inferior. If REGNUM is -1, do |
371 | this for all registers (including the floating point registers). */ | |
c906108c SS |
372 | |
373 | void | |
652fc137 | 374 | store_inferior_registers (int regnum) |
c906108c | 375 | { |
652fc137 MK |
376 | if (regnum == -1) |
377 | for (regnum = 0; regnum < NUM_REGS; regnum++) | |
378 | store_register (regnum); | |
c906108c | 379 | else |
652fc137 | 380 | store_register (regnum); |
c906108c | 381 | } |
652fc137 MK |
382 | |
383 | #endif /* not FETCH_INFERIOR_REGISTERS. */ | |
c906108c SS |
384 | \f |
385 | ||
94cd915f MS |
386 | /* Set an upper limit on alloca. */ |
387 | #ifndef GDB_MAX_ALLOCA | |
388 | #define GDB_MAX_ALLOCA 0x1000 | |
389 | #endif | |
390 | ||
c906108c SS |
391 | #if !defined (CHILD_XFER_MEMORY) |
392 | /* NOTE! I tried using PTRACE_READDATA, etc., to read and write memory | |
3c2fb7bd MK |
393 | in the NEW_SUN_PTRACE case. It ought to be straightforward. But |
394 | it appears that writing did not write the data that I specified. I | |
395 | cannot understand where it got the data that it actually did write. */ | |
c906108c | 396 | |
3c2fb7bd MK |
397 | /* Copy LEN bytes to or from inferior's memory starting at MEMADDR to |
398 | debugger memory starting at MYADDR. Copy to inferior if WRITE is | |
399 | nonzero. TARGET is ignored. | |
c5aa993b | 400 | |
3c2fb7bd MK |
401 | Returns the length copied, which is either the LEN argument or |
402 | zero. This xfer function does not do partial moves, since | |
403 | child_ops doesn't allow memory operations to cross below us in the | |
404 | target stack anyway. */ | |
c906108c SS |
405 | |
406 | int | |
73186089 | 407 | child_xfer_memory (CORE_ADDR memaddr, char *myaddr, int len, int write, |
0a65a603 | 408 | struct mem_attrib *attrib, struct target_ops *target) |
c906108c | 409 | { |
3c2fb7bd | 410 | int i; |
c906108c | 411 | /* Round starting address down to longword boundary. */ |
88800403 | 412 | CORE_ADDR addr = memaddr & -(CORE_ADDR) sizeof (PTRACE_TYPE_RET); |
c906108c | 413 | /* Round ending address up; get number of longwords that makes. */ |
88800403 MK |
414 | int count = ((((memaddr + len) - addr) + sizeof (PTRACE_TYPE_RET) - 1) |
415 | / sizeof (PTRACE_TYPE_RET)); | |
416 | int alloc = count * sizeof (PTRACE_TYPE_RET); | |
417 | PTRACE_TYPE_RET *buffer; | |
94cd915f MS |
418 | struct cleanup *old_chain = NULL; |
419 | ||
371a6e84 MK |
420 | #ifdef PT_IO |
421 | /* OpenBSD 3.1, NetBSD 1.6 and FreeBSD 5.0 have a new PT_IO request | |
422 | that promises to be much more efficient in reading and writing | |
423 | data in the traced process's address space. */ | |
424 | ||
425 | { | |
426 | struct ptrace_io_desc piod; | |
427 | ||
428 | /* NOTE: We assume that there are no distinct address spaces for | |
429 | instruction and data. */ | |
430 | piod.piod_op = write ? PIOD_WRITE_D : PIOD_READ_D; | |
431 | piod.piod_offs = (void *) memaddr; | |
432 | piod.piod_addr = myaddr; | |
433 | piod.piod_len = len; | |
434 | ||
435 | if (ptrace (PT_IO, PIDGET (inferior_ptid), (caddr_t) &piod, 0) == -1) | |
436 | { | |
437 | /* If the PT_IO request is somehow not supported, fallback on | |
438 | using PT_WRITE_D/PT_READ_D. Otherwise we will return zero | |
439 | to indicate failure. */ | |
440 | if (errno != EINVAL) | |
441 | return 0; | |
442 | } | |
443 | else | |
444 | { | |
445 | /* Return the actual number of bytes read or written. */ | |
446 | return piod.piod_len; | |
447 | } | |
448 | } | |
449 | #endif | |
450 | ||
c906108c | 451 | /* Allocate buffer of that many longwords. */ |
94cd915f MS |
452 | if (len < GDB_MAX_ALLOCA) |
453 | { | |
88800403 | 454 | buffer = (PTRACE_TYPE_RET *) alloca (alloc); |
94cd915f MS |
455 | } |
456 | else | |
457 | { | |
88800403 | 458 | buffer = (PTRACE_TYPE_RET *) xmalloc (alloc); |
94cd915f MS |
459 | old_chain = make_cleanup (xfree, buffer); |
460 | } | |
c906108c SS |
461 | |
462 | if (write) | |
463 | { | |
3c2fb7bd MK |
464 | /* Fill start and end extra bytes of buffer with existing memory |
465 | data. */ | |
88800403 | 466 | if (addr != memaddr || len < (int) sizeof (PTRACE_TYPE_RET)) |
c5aa993b JM |
467 | { |
468 | /* Need part of initial word -- fetch it. */ | |
39f77062 | 469 | buffer[0] = ptrace (PT_READ_I, PIDGET (inferior_ptid), |
655c5466 | 470 | (PTRACE_TYPE_ARG3) addr, 0); |
c5aa993b | 471 | } |
c906108c | 472 | |
3c2fb7bd | 473 | if (count > 1) /* FIXME, avoid if even boundary. */ |
c906108c | 474 | { |
3c2fb7bd MK |
475 | buffer[count - 1] = |
476 | ptrace (PT_READ_I, PIDGET (inferior_ptid), | |
655c5466 | 477 | ((PTRACE_TYPE_ARG3) |
88800403 | 478 | (addr + (count - 1) * sizeof (PTRACE_TYPE_RET))), 0); |
c906108c SS |
479 | } |
480 | ||
3c2fb7bd | 481 | /* Copy data to be written over corresponding part of buffer. */ |
88800403 | 482 | memcpy ((char *) buffer + (memaddr & (sizeof (PTRACE_TYPE_RET) - 1)), |
3c2fb7bd | 483 | myaddr, len); |
c906108c SS |
484 | |
485 | /* Write the entire buffer. */ | |
88800403 | 486 | for (i = 0; i < count; i++, addr += sizeof (PTRACE_TYPE_RET)) |
c906108c SS |
487 | { |
488 | errno = 0; | |
39f77062 | 489 | ptrace (PT_WRITE_D, PIDGET (inferior_ptid), |
655c5466 | 490 | (PTRACE_TYPE_ARG3) addr, buffer[i]); |
c906108c | 491 | if (errno) |
c5aa993b | 492 | { |
c906108c | 493 | /* Using the appropriate one (I or D) is necessary for |
c5aa993b | 494 | Gould NP1, at least. */ |
c906108c | 495 | errno = 0; |
39f77062 | 496 | ptrace (PT_WRITE_I, PIDGET (inferior_ptid), |
655c5466 | 497 | (PTRACE_TYPE_ARG3) addr, buffer[i]); |
c906108c SS |
498 | } |
499 | if (errno) | |
500 | return 0; | |
501 | } | |
c906108c SS |
502 | } |
503 | else | |
504 | { | |
3c2fb7bd | 505 | /* Read all the longwords. */ |
88800403 | 506 | for (i = 0; i < count; i++, addr += sizeof (PTRACE_TYPE_RET)) |
c906108c SS |
507 | { |
508 | errno = 0; | |
39f77062 | 509 | buffer[i] = ptrace (PT_READ_I, PIDGET (inferior_ptid), |
655c5466 | 510 | (PTRACE_TYPE_ARG3) addr, 0); |
c906108c SS |
511 | if (errno) |
512 | return 0; | |
513 | QUIT; | |
514 | } | |
515 | ||
516 | /* Copy appropriate bytes out of the buffer. */ | |
517 | memcpy (myaddr, | |
88800403 | 518 | (char *) buffer + (memaddr & (sizeof (PTRACE_TYPE_RET) - 1)), |
c906108c SS |
519 | len); |
520 | } | |
3c2fb7bd | 521 | |
94cd915f MS |
522 | if (old_chain != NULL) |
523 | do_cleanups (old_chain); | |
c906108c SS |
524 | return len; |
525 | } | |
c906108c | 526 | \f |
c5aa993b | 527 | |
c906108c | 528 | static void |
fba45db2 | 529 | udot_info (char *dummy1, int dummy2) |
c906108c SS |
530 | { |
531 | #if defined (KERNEL_U_SIZE) | |
7343d46a | 532 | long udot_off; /* Offset into user struct */ |
c5aa993b JM |
533 | int udot_val; /* Value from user struct at udot_off */ |
534 | char mess[128]; /* For messages */ | |
c906108c SS |
535 | #endif |
536 | ||
c5aa993b JM |
537 | if (!target_has_execution) |
538 | { | |
539 | error ("The program is not being run."); | |
540 | } | |
c906108c SS |
541 | |
542 | #if !defined (KERNEL_U_SIZE) | |
543 | ||
544 | /* Adding support for this command is easy. Typically you just add a | |
545 | routine, called "kernel_u_size" that returns the size of the user | |
546 | struct, to the appropriate *-nat.c file and then add to the native | |
547 | config file "#define KERNEL_U_SIZE kernel_u_size()" */ | |
548 | error ("Don't know how large ``struct user'' is in this version of gdb."); | |
549 | ||
550 | #else | |
551 | ||
552 | for (udot_off = 0; udot_off < KERNEL_U_SIZE; udot_off += sizeof (udot_val)) | |
553 | { | |
554 | if ((udot_off % 24) == 0) | |
555 | { | |
556 | if (udot_off > 0) | |
557 | { | |
558 | printf_filtered ("\n"); | |
559 | } | |
7343d46a | 560 | printf_filtered ("%s:", paddr (udot_off)); |
c906108c | 561 | } |
655c5466 | 562 | udot_val = ptrace (PT_READ_U, PIDGET (inferior_ptid), (PTRACE_TYPE_ARG3) udot_off, 0); |
c906108c SS |
563 | if (errno != 0) |
564 | { | |
7343d46a AC |
565 | sprintf (mess, "\nreading user struct at offset 0x%s", |
566 | paddr_nz (udot_off)); | |
c906108c SS |
567 | perror_with_name (mess); |
568 | } | |
569 | /* Avoid using nonportable (?) "*" in print specs */ | |
570 | printf_filtered (sizeof (int) == 4 ? " 0x%08x" : " 0x%16x", udot_val); | |
571 | } | |
572 | printf_filtered ("\n"); | |
573 | ||
574 | #endif | |
575 | } | |
576 | #endif /* !defined (CHILD_XFER_MEMORY). */ | |
c906108c | 577 | \f |
c5aa993b | 578 | |
c906108c | 579 | void |
fba45db2 | 580 | _initialize_infptrace (void) |
c906108c SS |
581 | { |
582 | #if !defined (CHILD_XFER_MEMORY) | |
583 | add_info ("udot", udot_info, | |
584 | "Print contents of kernel ``struct user'' for current child."); | |
585 | #endif | |
586 | } |