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c906108c SS |
1 | /* Low level Unix child interface to ptrace, for GDB when running under Unix. |
2 | Copyright 1988, 89, 90, 91, 92, 93, 94, 95, 96, 1998 | |
3 | Free Software Foundation, Inc. | |
4 | ||
c5aa993b | 5 | This file is part of GDB. |
c906108c | 6 | |
c5aa993b JM |
7 | This program is free software; you can redistribute it and/or modify |
8 | it under the terms of the GNU General Public License as published by | |
9 | the Free Software Foundation; either version 2 of the License, or | |
10 | (at your option) any later version. | |
c906108c | 11 | |
c5aa993b JM |
12 | This program is distributed in the hope that it will be useful, |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | GNU General Public License for more details. | |
c906108c | 16 | |
c5aa993b JM |
17 | You should have received a copy of the GNU General Public License |
18 | along with this program; if not, write to the Free Software | |
19 | Foundation, Inc., 59 Temple Place - Suite 330, | |
20 | Boston, MA 02111-1307, USA. */ | |
c906108c SS |
21 | |
22 | #include "defs.h" | |
23 | #include "frame.h" | |
24 | #include "inferior.h" | |
25 | #include "target.h" | |
26 | #include "gdb_string.h" | |
27 | #include "wait.h" | |
28 | #include "command.h" | |
29 | ||
30 | #ifdef USG | |
31 | #include <sys/types.h> | |
32 | #endif | |
33 | ||
34 | #include <sys/param.h> | |
35 | #include <sys/dir.h> | |
36 | #include <signal.h> | |
37 | #include <sys/ioctl.h> | |
38 | ||
39 | #ifdef HAVE_PTRACE_H | |
c5aa993b | 40 | #include <ptrace.h> |
c906108c | 41 | #else |
c5aa993b JM |
42 | #ifdef HAVE_SYS_PTRACE_H |
43 | #include <sys/ptrace.h> | |
44 | #endif | |
c906108c SS |
45 | #endif |
46 | ||
47 | #if !defined (PT_READ_I) | |
48 | #define PT_READ_I 1 /* Read word from text space */ | |
49 | #endif | |
50 | #if !defined (PT_READ_D) | |
51 | #define PT_READ_D 2 /* Read word from data space */ | |
52 | #endif | |
53 | #if !defined (PT_READ_U) | |
54 | #define PT_READ_U 3 /* Read word from kernel user struct */ | |
55 | #endif | |
56 | #if !defined (PT_WRITE_I) | |
57 | #define PT_WRITE_I 4 /* Write word to text space */ | |
58 | #endif | |
59 | #if !defined (PT_WRITE_D) | |
60 | #define PT_WRITE_D 5 /* Write word to data space */ | |
61 | #endif | |
62 | #if !defined (PT_WRITE_U) | |
63 | #define PT_WRITE_U 6 /* Write word to kernel user struct */ | |
64 | #endif | |
65 | #if !defined (PT_CONTINUE) | |
66 | #define PT_CONTINUE 7 /* Continue after signal */ | |
67 | #endif | |
68 | #if !defined (PT_STEP) | |
69 | #define PT_STEP 9 /* Set flag for single stepping */ | |
70 | #endif | |
71 | #if !defined (PT_KILL) | |
72 | #define PT_KILL 8 /* Send child a SIGKILL signal */ | |
73 | #endif | |
74 | ||
75 | #ifndef PT_ATTACH | |
76 | #define PT_ATTACH PTRACE_ATTACH | |
77 | #endif | |
78 | #ifndef PT_DETACH | |
79 | #define PT_DETACH PTRACE_DETACH | |
80 | #endif | |
81 | ||
82 | #include "gdbcore.h" | |
83 | #ifndef NO_SYS_FILE | |
84 | #include <sys/file.h> | |
85 | #endif | |
86 | #if 0 | |
87 | /* Don't think this is used anymore. On the sequent (not sure whether it's | |
88 | dynix or ptx or both), it is included unconditionally by sys/user.h and | |
89 | not protected against multiple inclusion. */ | |
90 | #include "gdb_stat.h" | |
91 | #endif | |
92 | ||
93 | #if !defined (FETCH_INFERIOR_REGISTERS) | |
94 | #include <sys/user.h> /* Probably need to poke the user structure */ | |
95 | #if defined (KERNEL_U_ADDR_BSD) | |
96 | #include <a.out.h> /* For struct nlist */ | |
97 | #endif /* KERNEL_U_ADDR_BSD. */ | |
98 | #endif /* !FETCH_INFERIOR_REGISTERS */ | |
99 | ||
100 | #if !defined (CHILD_XFER_MEMORY) | |
101 | static void udot_info PARAMS ((char *, int)); | |
102 | #endif | |
103 | ||
104 | #if !defined (FETCH_INFERIOR_REGISTERS) | |
105 | static void fetch_register PARAMS ((int)); | |
106 | static void store_register PARAMS ((int)); | |
107 | #endif | |
108 | ||
109 | void _initialize_kernel_u_addr PARAMS ((void)); | |
110 | void _initialize_infptrace PARAMS ((void)); | |
c906108c | 111 | \f |
c5aa993b | 112 | |
c906108c SS |
113 | /* This function simply calls ptrace with the given arguments. |
114 | It exists so that all calls to ptrace are isolated in this | |
115 | machine-dependent file. */ | |
116 | int | |
117 | call_ptrace (request, pid, addr, data) | |
118 | int request, pid; | |
119 | PTRACE_ARG3_TYPE addr; | |
120 | int data; | |
121 | { | |
122 | int pt_status = 0; | |
123 | ||
124 | #if 0 | |
125 | int saved_errno; | |
126 | ||
127 | printf ("call_ptrace(request=%d, pid=%d, addr=0x%x, data=0x%x)", | |
128 | request, pid, addr, data); | |
129 | #endif | |
130 | #if defined(PT_SETTRC) | |
131 | /* If the parent can be told to attach to us, try to do it. */ | |
c5aa993b JM |
132 | if (request == PT_SETTRC) |
133 | { | |
134 | errno = 0; | |
135 | pt_status = ptrace (PT_SETTRC, pid, addr, data | |
c906108c | 136 | #if defined (FIVE_ARG_PTRACE) |
c5aa993b JM |
137 | /* Deal with HPUX 8.0 braindamage. We never use the |
138 | calls which require the fifth argument. */ | |
139 | ,0 | |
c906108c | 140 | #endif |
c5aa993b | 141 | ); |
c906108c | 142 | |
c5aa993b JM |
143 | if (errno) |
144 | perror_with_name ("ptrace"); | |
c906108c | 145 | #if 0 |
c5aa993b | 146 | printf (" = %d\n", pt_status); |
c906108c | 147 | #endif |
c5aa993b JM |
148 | if (pt_status < 0) |
149 | return pt_status; | |
150 | else | |
151 | return parent_attach_all (pid, addr, data); | |
152 | } | |
c906108c SS |
153 | #endif |
154 | ||
155 | #if defined(PT_CONTIN1) | |
156 | /* On HPUX, PT_CONTIN1 is a form of continue that preserves pending | |
157 | signals. If it's available, use it. */ | |
158 | if (request == PT_CONTINUE) | |
159 | request = PT_CONTIN1; | |
160 | #endif | |
161 | ||
162 | #if defined(PT_SINGLE1) | |
163 | /* On HPUX, PT_SINGLE1 is a form of step that preserves pending | |
164 | signals. If it's available, use it. */ | |
165 | if (request == PT_STEP) | |
166 | request = PT_SINGLE1; | |
167 | #endif | |
168 | ||
169 | #if 0 | |
170 | saved_errno = errno; | |
171 | errno = 0; | |
172 | #endif | |
173 | pt_status = ptrace (request, pid, addr, data | |
174 | #if defined (FIVE_ARG_PTRACE) | |
c5aa993b JM |
175 | /* Deal with HPUX 8.0 braindamage. We never use the |
176 | calls which require the fifth argument. */ | |
177 | ,0 | |
c906108c | 178 | #endif |
c5aa993b | 179 | ); |
c906108c SS |
180 | #if 0 |
181 | if (errno) | |
182 | printf (" [errno = %d]", errno); | |
183 | ||
184 | errno = saved_errno; | |
185 | printf (" = 0x%x\n", pt_status); | |
186 | #endif | |
187 | return pt_status; | |
188 | } | |
189 | ||
190 | ||
191 | #if defined (DEBUG_PTRACE) || defined (FIVE_ARG_PTRACE) | |
192 | /* For the rest of the file, use an extra level of indirection */ | |
193 | /* This lets us breakpoint usefully on call_ptrace. */ | |
194 | #define ptrace call_ptrace | |
195 | #endif | |
196 | ||
197 | /* Wait for a process to finish, possibly running a target-specific | |
198 | hook before returning. */ | |
199 | ||
200 | int | |
201 | ptrace_wait (pid, status) | |
c5aa993b JM |
202 | int pid; |
203 | int *status; | |
c906108c SS |
204 | { |
205 | int wstate; | |
206 | ||
207 | wstate = wait (status); | |
208 | target_post_wait (wstate, *status); | |
209 | return wstate; | |
210 | } | |
211 | ||
212 | void | |
213 | kill_inferior () | |
214 | { | |
215 | int status; | |
216 | ||
217 | if (inferior_pid == 0) | |
218 | return; | |
219 | ||
220 | /* This once used to call "kill" to kill the inferior just in case | |
221 | the inferior was still running. As others have noted in the past | |
222 | (kingdon) there shouldn't be any way to get here if the inferior | |
223 | is still running -- else there's a major problem elsewere in gdb | |
224 | and it needs to be fixed. | |
225 | ||
226 | The kill call causes problems under hpux10, so it's been removed; | |
227 | if this causes problems we'll deal with them as they arise. */ | |
228 | ptrace (PT_KILL, inferior_pid, (PTRACE_ARG3_TYPE) 0, 0); | |
229 | ptrace_wait (0, &status); | |
230 | target_mourn_inferior (); | |
231 | } | |
232 | ||
233 | #ifndef CHILD_RESUME | |
234 | ||
235 | /* Resume execution of the inferior process. | |
236 | If STEP is nonzero, single-step it. | |
237 | If SIGNAL is nonzero, give it that signal. */ | |
238 | ||
239 | void | |
240 | child_resume (pid, step, signal) | |
241 | int pid; | |
242 | int step; | |
243 | enum target_signal signal; | |
244 | { | |
245 | errno = 0; | |
246 | ||
247 | if (pid == -1) | |
248 | /* Resume all threads. */ | |
249 | /* I think this only gets used in the non-threaded case, where "resume | |
250 | all threads" and "resume inferior_pid" are the same. */ | |
251 | pid = inferior_pid; | |
252 | ||
253 | /* An address of (PTRACE_ARG3_TYPE)1 tells ptrace to continue from where | |
254 | it was. (If GDB wanted it to start some other way, we have already | |
255 | written a new PC value to the child.) | |
256 | ||
257 | If this system does not support PT_STEP, a higher level function will | |
258 | have called single_step() to transmute the step request into a | |
259 | continue request (by setting breakpoints on all possible successor | |
260 | instructions), so we don't have to worry about that here. */ | |
261 | ||
262 | if (step) | |
263 | { | |
264 | if (SOFTWARE_SINGLE_STEP_P) | |
c5aa993b | 265 | abort (); /* Make sure this doesn't happen. */ |
c906108c | 266 | else |
c5aa993b | 267 | ptrace (PT_STEP, pid, (PTRACE_ARG3_TYPE) 1, |
c906108c SS |
268 | target_signal_to_host (signal)); |
269 | } | |
270 | else | |
271 | ptrace (PT_CONTINUE, pid, (PTRACE_ARG3_TYPE) 1, | |
272 | target_signal_to_host (signal)); | |
273 | ||
274 | if (errno) | |
275 | perror_with_name ("ptrace"); | |
276 | } | |
277 | #endif /* CHILD_RESUME */ | |
c906108c | 278 | \f |
c5aa993b | 279 | |
c906108c SS |
280 | #ifdef ATTACH_DETACH |
281 | /* Start debugging the process whose number is PID. */ | |
282 | int | |
283 | attach (pid) | |
284 | int pid; | |
285 | { | |
286 | errno = 0; | |
287 | ptrace (PT_ATTACH, pid, (PTRACE_ARG3_TYPE) 0, 0); | |
288 | if (errno) | |
289 | perror_with_name ("ptrace"); | |
290 | attach_flag = 1; | |
291 | return pid; | |
292 | } | |
293 | ||
294 | /* Stop debugging the process whose number is PID | |
295 | and continue it with signal number SIGNAL. | |
296 | SIGNAL = 0 means just continue it. */ | |
297 | ||
298 | void | |
299 | detach (signal) | |
300 | int signal; | |
301 | { | |
302 | errno = 0; | |
303 | ptrace (PT_DETACH, inferior_pid, (PTRACE_ARG3_TYPE) 1, signal); | |
304 | if (errno) | |
305 | perror_with_name ("ptrace"); | |
306 | attach_flag = 0; | |
307 | } | |
308 | #endif /* ATTACH_DETACH */ | |
309 | \f | |
310 | /* Default the type of the ptrace transfer to int. */ | |
311 | #ifndef PTRACE_XFER_TYPE | |
312 | #define PTRACE_XFER_TYPE int | |
313 | #endif | |
314 | ||
315 | /* KERNEL_U_ADDR is the amount to subtract from u.u_ar0 | |
316 | to get the offset in the core file of the register values. */ | |
317 | #if defined (KERNEL_U_ADDR_BSD) && !defined (FETCH_INFERIOR_REGISTERS) | |
318 | /* Get kernel_u_addr using BSD-style nlist(). */ | |
319 | CORE_ADDR kernel_u_addr; | |
320 | #endif /* KERNEL_U_ADDR_BSD. */ | |
321 | ||
322 | void | |
323 | _initialize_kernel_u_addr () | |
324 | { | |
325 | #if defined (KERNEL_U_ADDR_BSD) && !defined (FETCH_INFERIOR_REGISTERS) | |
326 | struct nlist names[2]; | |
327 | ||
328 | names[0].n_un.n_name = "_u"; | |
329 | names[1].n_un.n_name = NULL; | |
330 | if (nlist ("/vmunix", names) == 0) | |
331 | kernel_u_addr = names[0].n_value; | |
332 | else | |
333 | fatal ("Unable to get kernel u area address."); | |
334 | #endif /* KERNEL_U_ADDR_BSD. */ | |
335 | } | |
336 | ||
337 | #if !defined (FETCH_INFERIOR_REGISTERS) | |
338 | ||
339 | #if !defined (offsetof) | |
340 | #define offsetof(TYPE, MEMBER) ((unsigned long) &((TYPE *)0)->MEMBER) | |
341 | #endif | |
342 | ||
343 | /* U_REGS_OFFSET is the offset of the registers within the u area. */ | |
344 | #if !defined (U_REGS_OFFSET) | |
345 | #define U_REGS_OFFSET \ | |
346 | ptrace (PT_READ_U, inferior_pid, \ | |
347 | (PTRACE_ARG3_TYPE) (offsetof (struct user, u_ar0)), 0) \ | |
348 | - KERNEL_U_ADDR | |
349 | #endif | |
350 | ||
351 | /* Registers we shouldn't try to fetch. */ | |
352 | #if !defined (CANNOT_FETCH_REGISTER) | |
353 | #define CANNOT_FETCH_REGISTER(regno) 0 | |
354 | #endif | |
355 | ||
356 | /* Fetch one register. */ | |
357 | ||
358 | static void | |
359 | fetch_register (regno) | |
360 | int regno; | |
361 | { | |
362 | /* This isn't really an address. But ptrace thinks of it as one. */ | |
363 | CORE_ADDR regaddr; | |
c5aa993b | 364 | char mess[128]; /* For messages */ |
c906108c | 365 | register int i; |
c5aa993b | 366 | unsigned int offset; /* Offset of registers within the u area. */ |
c906108c SS |
367 | char buf[MAX_REGISTER_RAW_SIZE]; |
368 | ||
369 | if (CANNOT_FETCH_REGISTER (regno)) | |
370 | { | |
371 | memset (buf, '\0', REGISTER_RAW_SIZE (regno)); /* Supply zeroes */ | |
372 | supply_register (regno, buf); | |
373 | return; | |
374 | } | |
375 | ||
376 | offset = U_REGS_OFFSET; | |
377 | ||
378 | regaddr = register_addr (regno, offset); | |
379 | for (i = 0; i < REGISTER_RAW_SIZE (regno); i += sizeof (PTRACE_XFER_TYPE)) | |
380 | { | |
381 | errno = 0; | |
c5aa993b JM |
382 | *(PTRACE_XFER_TYPE *) & buf[i] = ptrace (PT_READ_U, inferior_pid, |
383 | (PTRACE_ARG3_TYPE) regaddr, 0); | |
c906108c SS |
384 | regaddr += sizeof (PTRACE_XFER_TYPE); |
385 | if (errno != 0) | |
386 | { | |
387 | sprintf (mess, "reading register %s (#%d)", REGISTER_NAME (regno), regno); | |
388 | perror_with_name (mess); | |
389 | } | |
390 | } | |
391 | supply_register (regno, buf); | |
392 | } | |
393 | ||
394 | ||
395 | /* Fetch register values from the inferior. | |
396 | If REGNO is negative, do this for all registers. | |
397 | Otherwise, REGNO specifies which register (so we can save time). */ | |
398 | ||
399 | void | |
400 | fetch_inferior_registers (regno) | |
401 | int regno; | |
402 | { | |
403 | if (regno >= 0) | |
404 | { | |
405 | fetch_register (regno); | |
406 | } | |
407 | else | |
408 | { | |
409 | for (regno = 0; regno < ARCH_NUM_REGS; regno++) | |
410 | { | |
411 | fetch_register (regno); | |
412 | } | |
413 | } | |
414 | } | |
415 | ||
416 | /* Registers we shouldn't try to store. */ | |
417 | #if !defined (CANNOT_STORE_REGISTER) | |
418 | #define CANNOT_STORE_REGISTER(regno) 0 | |
419 | #endif | |
420 | ||
421 | /* Store one register. */ | |
422 | ||
423 | static void | |
424 | store_register (regno) | |
425 | int regno; | |
426 | { | |
427 | /* This isn't really an address. But ptrace thinks of it as one. */ | |
428 | CORE_ADDR regaddr; | |
c5aa993b | 429 | char mess[128]; /* For messages */ |
c906108c | 430 | register int i; |
c5aa993b | 431 | unsigned int offset; /* Offset of registers within the u area. */ |
c906108c SS |
432 | |
433 | if (CANNOT_STORE_REGISTER (regno)) | |
434 | { | |
435 | return; | |
436 | } | |
437 | ||
438 | offset = U_REGS_OFFSET; | |
439 | ||
440 | regaddr = register_addr (regno, offset); | |
c5aa993b | 441 | for (i = 0; i < REGISTER_RAW_SIZE (regno); i += sizeof (PTRACE_XFER_TYPE)) |
c906108c SS |
442 | { |
443 | errno = 0; | |
444 | ptrace (PT_WRITE_U, inferior_pid, (PTRACE_ARG3_TYPE) regaddr, | |
c5aa993b | 445 | *(PTRACE_XFER_TYPE *) & registers[REGISTER_BYTE (regno) + i]); |
c906108c SS |
446 | regaddr += sizeof (PTRACE_XFER_TYPE); |
447 | if (errno != 0) | |
448 | { | |
449 | sprintf (mess, "writing register %s (#%d)", REGISTER_NAME (regno), regno); | |
450 | perror_with_name (mess); | |
451 | } | |
452 | } | |
453 | } | |
454 | ||
455 | /* Store our register values back into the inferior. | |
456 | If REGNO is negative, do this for all registers. | |
457 | Otherwise, REGNO specifies which register (so we can save time). */ | |
458 | ||
459 | void | |
460 | store_inferior_registers (regno) | |
461 | int regno; | |
462 | { | |
463 | if (regno >= 0) | |
464 | { | |
465 | store_register (regno); | |
466 | } | |
467 | else | |
468 | { | |
469 | for (regno = 0; regno < ARCH_NUM_REGS; regno++) | |
470 | { | |
471 | store_register (regno); | |
472 | } | |
473 | } | |
474 | } | |
475 | #endif /* !defined (FETCH_INFERIOR_REGISTERS). */ | |
476 | \f | |
477 | ||
478 | #if !defined (CHILD_XFER_MEMORY) | |
479 | /* NOTE! I tried using PTRACE_READDATA, etc., to read and write memory | |
480 | in the NEW_SUN_PTRACE case. | |
481 | It ought to be straightforward. But it appears that writing did | |
482 | not write the data that I specified. I cannot understand where | |
483 | it got the data that it actually did write. */ | |
484 | ||
485 | /* Copy LEN bytes to or from inferior's memory starting at MEMADDR | |
486 | to debugger memory starting at MYADDR. Copy to inferior if | |
487 | WRITE is nonzero. | |
c5aa993b | 488 | |
c906108c SS |
489 | Returns the length copied, which is either the LEN argument or zero. |
490 | This xfer function does not do partial moves, since child_ops | |
491 | doesn't allow memory operations to cross below us in the target stack | |
492 | anyway. */ | |
493 | ||
494 | int | |
495 | child_xfer_memory (memaddr, myaddr, len, write, target) | |
496 | CORE_ADDR memaddr; | |
497 | char *myaddr; | |
498 | int len; | |
499 | int write; | |
c5aa993b | 500 | struct target_ops *target; /* ignored */ |
c906108c SS |
501 | { |
502 | register int i; | |
503 | /* Round starting address down to longword boundary. */ | |
c5aa993b | 504 | register CORE_ADDR addr = memaddr & -sizeof (PTRACE_XFER_TYPE); |
c906108c SS |
505 | /* Round ending address up; get number of longwords that makes. */ |
506 | register int count | |
c5aa993b JM |
507 | = (((memaddr + len) - addr) + sizeof (PTRACE_XFER_TYPE) - 1) |
508 | / sizeof (PTRACE_XFER_TYPE); | |
c906108c SS |
509 | /* Allocate buffer of that many longwords. */ |
510 | register PTRACE_XFER_TYPE *buffer | |
c5aa993b | 511 | = (PTRACE_XFER_TYPE *) alloca (count * sizeof (PTRACE_XFER_TYPE)); |
c906108c SS |
512 | |
513 | if (write) | |
514 | { | |
515 | /* Fill start and end extra bytes of buffer with existing memory data. */ | |
516 | ||
c5aa993b JM |
517 | if (addr != memaddr || len < (int) sizeof (PTRACE_XFER_TYPE)) |
518 | { | |
519 | /* Need part of initial word -- fetch it. */ | |
520 | buffer[0] = ptrace (PT_READ_I, inferior_pid, (PTRACE_ARG3_TYPE) addr, | |
521 | 0); | |
522 | } | |
c906108c SS |
523 | |
524 | if (count > 1) /* FIXME, avoid if even boundary */ | |
525 | { | |
526 | buffer[count - 1] | |
527 | = ptrace (PT_READ_I, inferior_pid, | |
528 | ((PTRACE_ARG3_TYPE) | |
529 | (addr + (count - 1) * sizeof (PTRACE_XFER_TYPE))), | |
530 | 0); | |
531 | } | |
532 | ||
533 | /* Copy data to be written over corresponding part of buffer */ | |
534 | ||
535 | memcpy ((char *) buffer + (memaddr & (sizeof (PTRACE_XFER_TYPE) - 1)), | |
536 | myaddr, | |
537 | len); | |
538 | ||
539 | /* Write the entire buffer. */ | |
540 | ||
541 | for (i = 0; i < count; i++, addr += sizeof (PTRACE_XFER_TYPE)) | |
542 | { | |
543 | errno = 0; | |
544 | ptrace (PT_WRITE_D, inferior_pid, (PTRACE_ARG3_TYPE) addr, | |
545 | buffer[i]); | |
546 | if (errno) | |
c5aa993b | 547 | { |
c906108c | 548 | /* Using the appropriate one (I or D) is necessary for |
c5aa993b | 549 | Gould NP1, at least. */ |
c906108c SS |
550 | errno = 0; |
551 | ptrace (PT_WRITE_I, inferior_pid, (PTRACE_ARG3_TYPE) addr, | |
552 | buffer[i]); | |
553 | } | |
554 | if (errno) | |
555 | return 0; | |
556 | } | |
557 | #ifdef CLEAR_INSN_CACHE | |
c5aa993b | 558 | CLEAR_INSN_CACHE (); |
c906108c SS |
559 | #endif |
560 | } | |
561 | else | |
562 | { | |
563 | /* Read all the longwords */ | |
564 | for (i = 0; i < count; i++, addr += sizeof (PTRACE_XFER_TYPE)) | |
565 | { | |
566 | errno = 0; | |
567 | buffer[i] = ptrace (PT_READ_I, inferior_pid, | |
568 | (PTRACE_ARG3_TYPE) addr, 0); | |
569 | if (errno) | |
570 | return 0; | |
571 | QUIT; | |
572 | } | |
573 | ||
574 | /* Copy appropriate bytes out of the buffer. */ | |
575 | memcpy (myaddr, | |
576 | (char *) buffer + (memaddr & (sizeof (PTRACE_XFER_TYPE) - 1)), | |
577 | len); | |
578 | } | |
579 | return len; | |
580 | } | |
c906108c | 581 | \f |
c5aa993b | 582 | |
c906108c SS |
583 | static void |
584 | udot_info (dummy1, dummy2) | |
585 | char *dummy1; | |
586 | int dummy2; | |
587 | { | |
588 | #if defined (KERNEL_U_SIZE) | |
c5aa993b JM |
589 | int udot_off; /* Offset into user struct */ |
590 | int udot_val; /* Value from user struct at udot_off */ | |
591 | char mess[128]; /* For messages */ | |
c906108c SS |
592 | #endif |
593 | ||
c5aa993b JM |
594 | if (!target_has_execution) |
595 | { | |
596 | error ("The program is not being run."); | |
597 | } | |
c906108c SS |
598 | |
599 | #if !defined (KERNEL_U_SIZE) | |
600 | ||
601 | /* Adding support for this command is easy. Typically you just add a | |
602 | routine, called "kernel_u_size" that returns the size of the user | |
603 | struct, to the appropriate *-nat.c file and then add to the native | |
604 | config file "#define KERNEL_U_SIZE kernel_u_size()" */ | |
605 | error ("Don't know how large ``struct user'' is in this version of gdb."); | |
606 | ||
607 | #else | |
608 | ||
609 | for (udot_off = 0; udot_off < KERNEL_U_SIZE; udot_off += sizeof (udot_val)) | |
610 | { | |
611 | if ((udot_off % 24) == 0) | |
612 | { | |
613 | if (udot_off > 0) | |
614 | { | |
615 | printf_filtered ("\n"); | |
616 | } | |
617 | printf_filtered ("%04x:", udot_off); | |
618 | } | |
619 | udot_val = ptrace (PT_READ_U, inferior_pid, (PTRACE_ARG3_TYPE) udot_off, 0); | |
620 | if (errno != 0) | |
621 | { | |
622 | sprintf (mess, "\nreading user struct at offset 0x%x", udot_off); | |
623 | perror_with_name (mess); | |
624 | } | |
625 | /* Avoid using nonportable (?) "*" in print specs */ | |
626 | printf_filtered (sizeof (int) == 4 ? " 0x%08x" : " 0x%16x", udot_val); | |
627 | } | |
628 | printf_filtered ("\n"); | |
629 | ||
630 | #endif | |
631 | } | |
632 | #endif /* !defined (CHILD_XFER_MEMORY). */ | |
c906108c | 633 | \f |
c5aa993b | 634 | |
c906108c SS |
635 | void |
636 | _initialize_infptrace () | |
637 | { | |
638 | #if !defined (CHILD_XFER_MEMORY) | |
639 | add_info ("udot", udot_info, | |
640 | "Print contents of kernel ``struct user'' for current child."); | |
641 | #endif | |
642 | } |