Commit | Line | Data |
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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" | |
ed9a39eb | 27 | |
03f2053f | 28 | #include "gdb_wait.h" |
ed9a39eb | 29 | |
c906108c SS |
30 | #include "command.h" |
31 | ||
32 | #ifdef USG | |
33 | #include <sys/types.h> | |
34 | #endif | |
35 | ||
36 | #include <sys/param.h> | |
4b14d3e4 | 37 | #include "gdb_dirent.h" |
c906108c SS |
38 | #include <signal.h> |
39 | #include <sys/ioctl.h> | |
40 | ||
41 | #ifdef HAVE_PTRACE_H | |
c5aa993b | 42 | #include <ptrace.h> |
c906108c | 43 | #else |
c5aa993b JM |
44 | #ifdef HAVE_SYS_PTRACE_H |
45 | #include <sys/ptrace.h> | |
46 | #endif | |
c906108c SS |
47 | #endif |
48 | ||
49 | #if !defined (PT_READ_I) | |
50 | #define PT_READ_I 1 /* Read word from text space */ | |
51 | #endif | |
52 | #if !defined (PT_READ_D) | |
53 | #define PT_READ_D 2 /* Read word from data space */ | |
54 | #endif | |
55 | #if !defined (PT_READ_U) | |
56 | #define PT_READ_U 3 /* Read word from kernel user struct */ | |
57 | #endif | |
58 | #if !defined (PT_WRITE_I) | |
59 | #define PT_WRITE_I 4 /* Write word to text space */ | |
60 | #endif | |
61 | #if !defined (PT_WRITE_D) | |
62 | #define PT_WRITE_D 5 /* Write word to data space */ | |
63 | #endif | |
64 | #if !defined (PT_WRITE_U) | |
65 | #define PT_WRITE_U 6 /* Write word to kernel user struct */ | |
66 | #endif | |
67 | #if !defined (PT_CONTINUE) | |
68 | #define PT_CONTINUE 7 /* Continue after signal */ | |
69 | #endif | |
70 | #if !defined (PT_STEP) | |
71 | #define PT_STEP 9 /* Set flag for single stepping */ | |
72 | #endif | |
73 | #if !defined (PT_KILL) | |
74 | #define PT_KILL 8 /* Send child a SIGKILL signal */ | |
75 | #endif | |
76 | ||
77 | #ifndef PT_ATTACH | |
78 | #define PT_ATTACH PTRACE_ATTACH | |
79 | #endif | |
80 | #ifndef PT_DETACH | |
81 | #define PT_DETACH PTRACE_DETACH | |
82 | #endif | |
83 | ||
84 | #include "gdbcore.h" | |
85 | #ifndef NO_SYS_FILE | |
86 | #include <sys/file.h> | |
87 | #endif | |
88 | #if 0 | |
89 | /* Don't think this is used anymore. On the sequent (not sure whether it's | |
90 | dynix or ptx or both), it is included unconditionally by sys/user.h and | |
91 | not protected against multiple inclusion. */ | |
92 | #include "gdb_stat.h" | |
93 | #endif | |
94 | ||
95 | #if !defined (FETCH_INFERIOR_REGISTERS) | |
96 | #include <sys/user.h> /* Probably need to poke the user structure */ | |
97 | #if defined (KERNEL_U_ADDR_BSD) | |
98 | #include <a.out.h> /* For struct nlist */ | |
99 | #endif /* KERNEL_U_ADDR_BSD. */ | |
100 | #endif /* !FETCH_INFERIOR_REGISTERS */ | |
101 | ||
102 | #if !defined (CHILD_XFER_MEMORY) | |
a14ed312 | 103 | static void udot_info (char *, int); |
c906108c SS |
104 | #endif |
105 | ||
106 | #if !defined (FETCH_INFERIOR_REGISTERS) | |
a14ed312 KB |
107 | static void fetch_register (int); |
108 | static void store_register (int); | |
c906108c SS |
109 | #endif |
110 | ||
ed9a39eb JM |
111 | /* |
112 | * Some systems (Linux) may have threads implemented as pseudo-processes, | |
113 | * in which case we may be tracing more than one process at a time. | |
114 | * In that case, inferior_pid will contain the main process ID and the | |
115 | * individual thread (process) id mashed together. These macros are | |
116 | * used to separate them out. The definitions may be overridden in tm.h | |
117 | * | |
118 | * NOTE: default definitions here are for systems with no threads. | |
119 | * Useful definitions MUST be provided in tm.h | |
120 | */ | |
121 | ||
122 | #if !defined (PIDGET) /* Default definition for PIDGET/TIDGET. */ | |
123 | #define PIDGET(PID) PID | |
124 | #define TIDGET(PID) 0 | |
125 | #endif | |
126 | ||
a14ed312 KB |
127 | void _initialize_kernel_u_addr (void); |
128 | void _initialize_infptrace (void); | |
c906108c | 129 | \f |
c5aa993b | 130 | |
c906108c SS |
131 | /* This function simply calls ptrace with the given arguments. |
132 | It exists so that all calls to ptrace are isolated in this | |
133 | machine-dependent file. */ | |
134 | int | |
fba45db2 | 135 | call_ptrace (int request, int pid, PTRACE_ARG3_TYPE addr, int data) |
c906108c SS |
136 | { |
137 | int pt_status = 0; | |
138 | ||
139 | #if 0 | |
140 | int saved_errno; | |
141 | ||
142 | printf ("call_ptrace(request=%d, pid=%d, addr=0x%x, data=0x%x)", | |
143 | request, pid, addr, data); | |
144 | #endif | |
145 | #if defined(PT_SETTRC) | |
146 | /* If the parent can be told to attach to us, try to do it. */ | |
c5aa993b JM |
147 | if (request == PT_SETTRC) |
148 | { | |
149 | errno = 0; | |
ed9a39eb JM |
150 | #if !defined (FIVE_ARG_PTRACE) |
151 | pt_status = ptrace (PT_SETTRC, pid, addr, data); | |
152 | #else | |
c5aa993b JM |
153 | /* Deal with HPUX 8.0 braindamage. We never use the |
154 | calls which require the fifth argument. */ | |
ed9a39eb | 155 | pt_status = ptrace (PT_SETTRC, pid, addr, data, 0); |
c906108c | 156 | #endif |
c5aa993b JM |
157 | if (errno) |
158 | perror_with_name ("ptrace"); | |
c906108c | 159 | #if 0 |
c5aa993b | 160 | printf (" = %d\n", pt_status); |
c906108c | 161 | #endif |
c5aa993b JM |
162 | if (pt_status < 0) |
163 | return pt_status; | |
164 | else | |
165 | return parent_attach_all (pid, addr, data); | |
166 | } | |
c906108c SS |
167 | #endif |
168 | ||
169 | #if defined(PT_CONTIN1) | |
170 | /* On HPUX, PT_CONTIN1 is a form of continue that preserves pending | |
171 | signals. If it's available, use it. */ | |
172 | if (request == PT_CONTINUE) | |
173 | request = PT_CONTIN1; | |
174 | #endif | |
175 | ||
176 | #if defined(PT_SINGLE1) | |
177 | /* On HPUX, PT_SINGLE1 is a form of step that preserves pending | |
178 | signals. If it's available, use it. */ | |
179 | if (request == PT_STEP) | |
180 | request = PT_SINGLE1; | |
181 | #endif | |
182 | ||
183 | #if 0 | |
184 | saved_errno = errno; | |
185 | errno = 0; | |
186 | #endif | |
ed9a39eb JM |
187 | #if !defined (FIVE_ARG_PTRACE) |
188 | pt_status = ptrace (request, pid, addr, data); | |
189 | #else | |
c5aa993b JM |
190 | /* Deal with HPUX 8.0 braindamage. We never use the |
191 | calls which require the fifth argument. */ | |
ed9a39eb | 192 | pt_status = ptrace (request, pid, addr, data, 0); |
c906108c | 193 | #endif |
ed9a39eb | 194 | |
c906108c SS |
195 | #if 0 |
196 | if (errno) | |
197 | printf (" [errno = %d]", errno); | |
198 | ||
199 | errno = saved_errno; | |
200 | printf (" = 0x%x\n", pt_status); | |
201 | #endif | |
202 | return pt_status; | |
203 | } | |
204 | ||
205 | ||
206 | #if defined (DEBUG_PTRACE) || defined (FIVE_ARG_PTRACE) | |
207 | /* For the rest of the file, use an extra level of indirection */ | |
208 | /* This lets us breakpoint usefully on call_ptrace. */ | |
209 | #define ptrace call_ptrace | |
210 | #endif | |
211 | ||
212 | /* Wait for a process to finish, possibly running a target-specific | |
213 | hook before returning. */ | |
214 | ||
215 | int | |
fba45db2 | 216 | ptrace_wait (int pid, int *status) |
c906108c SS |
217 | { |
218 | int wstate; | |
219 | ||
220 | wstate = wait (status); | |
221 | target_post_wait (wstate, *status); | |
222 | return wstate; | |
223 | } | |
224 | ||
225 | void | |
fba45db2 | 226 | kill_inferior (void) |
c906108c SS |
227 | { |
228 | int status; | |
229 | ||
230 | if (inferior_pid == 0) | |
231 | return; | |
232 | ||
233 | /* This once used to call "kill" to kill the inferior just in case | |
234 | the inferior was still running. As others have noted in the past | |
235 | (kingdon) there shouldn't be any way to get here if the inferior | |
236 | is still running -- else there's a major problem elsewere in gdb | |
237 | and it needs to be fixed. | |
238 | ||
239 | The kill call causes problems under hpux10, so it's been removed; | |
240 | if this causes problems we'll deal with them as they arise. */ | |
241 | ptrace (PT_KILL, inferior_pid, (PTRACE_ARG3_TYPE) 0, 0); | |
242 | ptrace_wait (0, &status); | |
243 | target_mourn_inferior (); | |
244 | } | |
245 | ||
246 | #ifndef CHILD_RESUME | |
247 | ||
248 | /* Resume execution of the inferior process. | |
249 | If STEP is nonzero, single-step it. | |
250 | If SIGNAL is nonzero, give it that signal. */ | |
251 | ||
252 | void | |
fba45db2 | 253 | child_resume (int pid, int step, enum target_signal signal) |
c906108c SS |
254 | { |
255 | errno = 0; | |
256 | ||
257 | if (pid == -1) | |
258 | /* Resume all threads. */ | |
259 | /* I think this only gets used in the non-threaded case, where "resume | |
260 | all threads" and "resume inferior_pid" are the same. */ | |
261 | pid = inferior_pid; | |
262 | ||
263 | /* An address of (PTRACE_ARG3_TYPE)1 tells ptrace to continue from where | |
264 | it was. (If GDB wanted it to start some other way, we have already | |
265 | written a new PC value to the child.) | |
266 | ||
267 | If this system does not support PT_STEP, a higher level function will | |
268 | have called single_step() to transmute the step request into a | |
269 | continue request (by setting breakpoints on all possible successor | |
270 | instructions), so we don't have to worry about that here. */ | |
271 | ||
272 | if (step) | |
273 | { | |
274 | if (SOFTWARE_SINGLE_STEP_P) | |
c5aa993b | 275 | abort (); /* Make sure this doesn't happen. */ |
c906108c | 276 | else |
c5aa993b | 277 | ptrace (PT_STEP, pid, (PTRACE_ARG3_TYPE) 1, |
c906108c SS |
278 | target_signal_to_host (signal)); |
279 | } | |
280 | else | |
281 | ptrace (PT_CONTINUE, pid, (PTRACE_ARG3_TYPE) 1, | |
282 | target_signal_to_host (signal)); | |
283 | ||
284 | if (errno) | |
ed9a39eb JM |
285 | { |
286 | perror_with_name ("ptrace"); | |
287 | } | |
c906108c SS |
288 | } |
289 | #endif /* CHILD_RESUME */ | |
c906108c | 290 | \f |
c5aa993b | 291 | |
c906108c SS |
292 | #ifdef ATTACH_DETACH |
293 | /* Start debugging the process whose number is PID. */ | |
294 | int | |
fba45db2 | 295 | attach (int pid) |
c906108c SS |
296 | { |
297 | errno = 0; | |
298 | ptrace (PT_ATTACH, pid, (PTRACE_ARG3_TYPE) 0, 0); | |
299 | if (errno) | |
300 | perror_with_name ("ptrace"); | |
301 | attach_flag = 1; | |
302 | return pid; | |
303 | } | |
304 | ||
305 | /* Stop debugging the process whose number is PID | |
306 | and continue it with signal number SIGNAL. | |
307 | SIGNAL = 0 means just continue it. */ | |
308 | ||
309 | void | |
fba45db2 | 310 | detach (int signal) |
c906108c SS |
311 | { |
312 | errno = 0; | |
313 | ptrace (PT_DETACH, inferior_pid, (PTRACE_ARG3_TYPE) 1, signal); | |
314 | if (errno) | |
315 | perror_with_name ("ptrace"); | |
316 | attach_flag = 0; | |
317 | } | |
318 | #endif /* ATTACH_DETACH */ | |
319 | \f | |
320 | /* Default the type of the ptrace transfer to int. */ | |
321 | #ifndef PTRACE_XFER_TYPE | |
322 | #define PTRACE_XFER_TYPE int | |
323 | #endif | |
324 | ||
325 | /* KERNEL_U_ADDR is the amount to subtract from u.u_ar0 | |
326 | to get the offset in the core file of the register values. */ | |
327 | #if defined (KERNEL_U_ADDR_BSD) && !defined (FETCH_INFERIOR_REGISTERS) | |
328 | /* Get kernel_u_addr using BSD-style nlist(). */ | |
329 | CORE_ADDR kernel_u_addr; | |
330 | #endif /* KERNEL_U_ADDR_BSD. */ | |
331 | ||
332 | void | |
fba45db2 | 333 | _initialize_kernel_u_addr (void) |
c906108c SS |
334 | { |
335 | #if defined (KERNEL_U_ADDR_BSD) && !defined (FETCH_INFERIOR_REGISTERS) | |
336 | struct nlist names[2]; | |
337 | ||
338 | names[0].n_un.n_name = "_u"; | |
339 | names[1].n_un.n_name = NULL; | |
340 | if (nlist ("/vmunix", names) == 0) | |
341 | kernel_u_addr = names[0].n_value; | |
342 | else | |
96baa820 | 343 | internal_error ("Unable to get kernel u area address."); |
c906108c SS |
344 | #endif /* KERNEL_U_ADDR_BSD. */ |
345 | } | |
346 | ||
347 | #if !defined (FETCH_INFERIOR_REGISTERS) | |
348 | ||
349 | #if !defined (offsetof) | |
350 | #define offsetof(TYPE, MEMBER) ((unsigned long) &((TYPE *)0)->MEMBER) | |
351 | #endif | |
352 | ||
353 | /* U_REGS_OFFSET is the offset of the registers within the u area. */ | |
354 | #if !defined (U_REGS_OFFSET) | |
355 | #define U_REGS_OFFSET \ | |
356 | ptrace (PT_READ_U, inferior_pid, \ | |
357 | (PTRACE_ARG3_TYPE) (offsetof (struct user, u_ar0)), 0) \ | |
358 | - KERNEL_U_ADDR | |
359 | #endif | |
360 | ||
361 | /* Registers we shouldn't try to fetch. */ | |
362 | #if !defined (CANNOT_FETCH_REGISTER) | |
363 | #define CANNOT_FETCH_REGISTER(regno) 0 | |
364 | #endif | |
365 | ||
366 | /* Fetch one register. */ | |
367 | ||
368 | static void | |
fba45db2 | 369 | fetch_register (int regno) |
c906108c SS |
370 | { |
371 | /* This isn't really an address. But ptrace thinks of it as one. */ | |
372 | CORE_ADDR regaddr; | |
c5aa993b | 373 | char mess[128]; /* For messages */ |
c906108c | 374 | register int i; |
c5aa993b | 375 | unsigned int offset; /* Offset of registers within the u area. */ |
c906108c | 376 | char buf[MAX_REGISTER_RAW_SIZE]; |
ed9a39eb | 377 | int tid; |
c906108c SS |
378 | |
379 | if (CANNOT_FETCH_REGISTER (regno)) | |
380 | { | |
381 | memset (buf, '\0', REGISTER_RAW_SIZE (regno)); /* Supply zeroes */ | |
382 | supply_register (regno, buf); | |
383 | return; | |
384 | } | |
385 | ||
ed9a39eb JM |
386 | /* Overload thread id onto process id */ |
387 | if ((tid = TIDGET (inferior_pid)) == 0) | |
388 | tid = inferior_pid; /* no thread id, just use process id */ | |
389 | ||
c906108c SS |
390 | offset = U_REGS_OFFSET; |
391 | ||
392 | regaddr = register_addr (regno, offset); | |
393 | for (i = 0; i < REGISTER_RAW_SIZE (regno); i += sizeof (PTRACE_XFER_TYPE)) | |
394 | { | |
395 | errno = 0; | |
ed9a39eb JM |
396 | *(PTRACE_XFER_TYPE *) & buf[i] = ptrace (PT_READ_U, tid, |
397 | (PTRACE_ARG3_TYPE) regaddr, 0); | |
c906108c SS |
398 | regaddr += sizeof (PTRACE_XFER_TYPE); |
399 | if (errno != 0) | |
400 | { | |
ed9a39eb JM |
401 | sprintf (mess, "reading register %s (#%d)", |
402 | REGISTER_NAME (regno), regno); | |
c906108c SS |
403 | perror_with_name (mess); |
404 | } | |
405 | } | |
406 | supply_register (regno, buf); | |
407 | } | |
408 | ||
409 | ||
410 | /* Fetch register values from the inferior. | |
411 | If REGNO is negative, do this for all registers. | |
412 | Otherwise, REGNO specifies which register (so we can save time). */ | |
413 | ||
414 | void | |
fba45db2 | 415 | fetch_inferior_registers (int regno) |
c906108c SS |
416 | { |
417 | if (regno >= 0) | |
418 | { | |
419 | fetch_register (regno); | |
420 | } | |
421 | else | |
422 | { | |
423 | for (regno = 0; regno < ARCH_NUM_REGS; regno++) | |
424 | { | |
425 | fetch_register (regno); | |
426 | } | |
427 | } | |
428 | } | |
429 | ||
430 | /* Registers we shouldn't try to store. */ | |
431 | #if !defined (CANNOT_STORE_REGISTER) | |
432 | #define CANNOT_STORE_REGISTER(regno) 0 | |
433 | #endif | |
434 | ||
435 | /* Store one register. */ | |
436 | ||
437 | static void | |
fba45db2 | 438 | store_register (int regno) |
c906108c SS |
439 | { |
440 | /* This isn't really an address. But ptrace thinks of it as one. */ | |
441 | CORE_ADDR regaddr; | |
c5aa993b | 442 | char mess[128]; /* For messages */ |
c906108c | 443 | register int i; |
c5aa993b | 444 | unsigned int offset; /* Offset of registers within the u area. */ |
ed9a39eb | 445 | int tid; |
c906108c SS |
446 | |
447 | if (CANNOT_STORE_REGISTER (regno)) | |
448 | { | |
449 | return; | |
450 | } | |
451 | ||
ed9a39eb JM |
452 | /* Overload thread id onto process id */ |
453 | if ((tid = TIDGET (inferior_pid)) == 0) | |
454 | tid = inferior_pid; /* no thread id, just use process id */ | |
455 | ||
c906108c SS |
456 | offset = U_REGS_OFFSET; |
457 | ||
458 | regaddr = register_addr (regno, offset); | |
c5aa993b | 459 | for (i = 0; i < REGISTER_RAW_SIZE (regno); i += sizeof (PTRACE_XFER_TYPE)) |
c906108c SS |
460 | { |
461 | errno = 0; | |
ed9a39eb | 462 | ptrace (PT_WRITE_U, tid, (PTRACE_ARG3_TYPE) regaddr, |
c5aa993b | 463 | *(PTRACE_XFER_TYPE *) & registers[REGISTER_BYTE (regno) + i]); |
c906108c SS |
464 | regaddr += sizeof (PTRACE_XFER_TYPE); |
465 | if (errno != 0) | |
466 | { | |
ed9a39eb JM |
467 | sprintf (mess, "writing register %s (#%d)", |
468 | REGISTER_NAME (regno), regno); | |
c906108c SS |
469 | perror_with_name (mess); |
470 | } | |
471 | } | |
472 | } | |
473 | ||
474 | /* Store our register values back into the inferior. | |
475 | If REGNO is negative, do this for all registers. | |
476 | Otherwise, REGNO specifies which register (so we can save time). */ | |
477 | ||
478 | void | |
fba45db2 | 479 | store_inferior_registers (int regno) |
c906108c SS |
480 | { |
481 | if (regno >= 0) | |
482 | { | |
483 | store_register (regno); | |
484 | } | |
485 | else | |
486 | { | |
487 | for (regno = 0; regno < ARCH_NUM_REGS; regno++) | |
488 | { | |
489 | store_register (regno); | |
490 | } | |
491 | } | |
492 | } | |
493 | #endif /* !defined (FETCH_INFERIOR_REGISTERS). */ | |
494 | \f | |
495 | ||
496 | #if !defined (CHILD_XFER_MEMORY) | |
497 | /* NOTE! I tried using PTRACE_READDATA, etc., to read and write memory | |
498 | in the NEW_SUN_PTRACE case. | |
499 | It ought to be straightforward. But it appears that writing did | |
500 | not write the data that I specified. I cannot understand where | |
501 | it got the data that it actually did write. */ | |
502 | ||
503 | /* Copy LEN bytes to or from inferior's memory starting at MEMADDR | |
504 | to debugger memory starting at MYADDR. Copy to inferior if | |
73186089 | 505 | WRITE is nonzero. TARGET is ignored. |
c5aa993b | 506 | |
c906108c SS |
507 | Returns the length copied, which is either the LEN argument or zero. |
508 | This xfer function does not do partial moves, since child_ops | |
509 | doesn't allow memory operations to cross below us in the target stack | |
510 | anyway. */ | |
511 | ||
512 | int | |
73186089 KB |
513 | child_xfer_memory (CORE_ADDR memaddr, char *myaddr, int len, int write, |
514 | struct target_ops *target) | |
c906108c SS |
515 | { |
516 | register int i; | |
517 | /* Round starting address down to longword boundary. */ | |
c5aa993b | 518 | register CORE_ADDR addr = memaddr & -sizeof (PTRACE_XFER_TYPE); |
c906108c SS |
519 | /* Round ending address up; get number of longwords that makes. */ |
520 | register int count | |
c5aa993b JM |
521 | = (((memaddr + len) - addr) + sizeof (PTRACE_XFER_TYPE) - 1) |
522 | / sizeof (PTRACE_XFER_TYPE); | |
c906108c SS |
523 | /* Allocate buffer of that many longwords. */ |
524 | register PTRACE_XFER_TYPE *buffer | |
c5aa993b | 525 | = (PTRACE_XFER_TYPE *) alloca (count * sizeof (PTRACE_XFER_TYPE)); |
c906108c SS |
526 | |
527 | if (write) | |
528 | { | |
529 | /* Fill start and end extra bytes of buffer with existing memory data. */ | |
530 | ||
c5aa993b JM |
531 | if (addr != memaddr || len < (int) sizeof (PTRACE_XFER_TYPE)) |
532 | { | |
533 | /* Need part of initial word -- fetch it. */ | |
ed9a39eb JM |
534 | buffer[0] = ptrace (PT_READ_I, PIDGET (inferior_pid), |
535 | (PTRACE_ARG3_TYPE) addr, 0); | |
c5aa993b | 536 | } |
c906108c SS |
537 | |
538 | if (count > 1) /* FIXME, avoid if even boundary */ | |
539 | { | |
ed9a39eb JM |
540 | buffer[count - 1] |
541 | = ptrace (PT_READ_I, PIDGET (inferior_pid), | |
c906108c SS |
542 | ((PTRACE_ARG3_TYPE) |
543 | (addr + (count - 1) * sizeof (PTRACE_XFER_TYPE))), | |
544 | 0); | |
545 | } | |
546 | ||
547 | /* Copy data to be written over corresponding part of buffer */ | |
548 | ||
549 | memcpy ((char *) buffer + (memaddr & (sizeof (PTRACE_XFER_TYPE) - 1)), | |
550 | myaddr, | |
551 | len); | |
552 | ||
553 | /* Write the entire buffer. */ | |
554 | ||
555 | for (i = 0; i < count; i++, addr += sizeof (PTRACE_XFER_TYPE)) | |
556 | { | |
557 | errno = 0; | |
ed9a39eb JM |
558 | ptrace (PT_WRITE_D, PIDGET (inferior_pid), |
559 | (PTRACE_ARG3_TYPE) addr, buffer[i]); | |
c906108c | 560 | if (errno) |
c5aa993b | 561 | { |
c906108c | 562 | /* Using the appropriate one (I or D) is necessary for |
c5aa993b | 563 | Gould NP1, at least. */ |
c906108c | 564 | errno = 0; |
ed9a39eb JM |
565 | ptrace (PT_WRITE_I, PIDGET (inferior_pid), |
566 | (PTRACE_ARG3_TYPE) addr, buffer[i]); | |
c906108c SS |
567 | } |
568 | if (errno) | |
569 | return 0; | |
570 | } | |
571 | #ifdef CLEAR_INSN_CACHE | |
c5aa993b | 572 | CLEAR_INSN_CACHE (); |
c906108c SS |
573 | #endif |
574 | } | |
575 | else | |
576 | { | |
577 | /* Read all the longwords */ | |
578 | for (i = 0; i < count; i++, addr += sizeof (PTRACE_XFER_TYPE)) | |
579 | { | |
580 | errno = 0; | |
ed9a39eb | 581 | buffer[i] = ptrace (PT_READ_I, PIDGET (inferior_pid), |
c906108c SS |
582 | (PTRACE_ARG3_TYPE) addr, 0); |
583 | if (errno) | |
584 | return 0; | |
585 | QUIT; | |
586 | } | |
587 | ||
588 | /* Copy appropriate bytes out of the buffer. */ | |
589 | memcpy (myaddr, | |
590 | (char *) buffer + (memaddr & (sizeof (PTRACE_XFER_TYPE) - 1)), | |
591 | len); | |
592 | } | |
593 | return len; | |
594 | } | |
c906108c | 595 | \f |
c5aa993b | 596 | |
c906108c | 597 | static void |
fba45db2 | 598 | udot_info (char *dummy1, int dummy2) |
c906108c SS |
599 | { |
600 | #if defined (KERNEL_U_SIZE) | |
c5aa993b JM |
601 | int udot_off; /* Offset into user struct */ |
602 | int udot_val; /* Value from user struct at udot_off */ | |
603 | char mess[128]; /* For messages */ | |
c906108c SS |
604 | #endif |
605 | ||
c5aa993b JM |
606 | if (!target_has_execution) |
607 | { | |
608 | error ("The program is not being run."); | |
609 | } | |
c906108c SS |
610 | |
611 | #if !defined (KERNEL_U_SIZE) | |
612 | ||
613 | /* Adding support for this command is easy. Typically you just add a | |
614 | routine, called "kernel_u_size" that returns the size of the user | |
615 | struct, to the appropriate *-nat.c file and then add to the native | |
616 | config file "#define KERNEL_U_SIZE kernel_u_size()" */ | |
617 | error ("Don't know how large ``struct user'' is in this version of gdb."); | |
618 | ||
619 | #else | |
620 | ||
621 | for (udot_off = 0; udot_off < KERNEL_U_SIZE; udot_off += sizeof (udot_val)) | |
622 | { | |
623 | if ((udot_off % 24) == 0) | |
624 | { | |
625 | if (udot_off > 0) | |
626 | { | |
627 | printf_filtered ("\n"); | |
628 | } | |
629 | printf_filtered ("%04x:", udot_off); | |
630 | } | |
631 | udot_val = ptrace (PT_READ_U, inferior_pid, (PTRACE_ARG3_TYPE) udot_off, 0); | |
632 | if (errno != 0) | |
633 | { | |
634 | sprintf (mess, "\nreading user struct at offset 0x%x", udot_off); | |
635 | perror_with_name (mess); | |
636 | } | |
637 | /* Avoid using nonportable (?) "*" in print specs */ | |
638 | printf_filtered (sizeof (int) == 4 ? " 0x%08x" : " 0x%16x", udot_val); | |
639 | } | |
640 | printf_filtered ("\n"); | |
641 | ||
642 | #endif | |
643 | } | |
644 | #endif /* !defined (CHILD_XFER_MEMORY). */ | |
c906108c | 645 | \f |
c5aa993b | 646 | |
c906108c | 647 | void |
fba45db2 | 648 | _initialize_infptrace (void) |
c906108c SS |
649 | { |
650 | #if !defined (CHILD_XFER_MEMORY) | |
651 | add_info ("udot", udot_info, | |
652 | "Print contents of kernel ``struct user'' for current child."); | |
653 | #endif | |
654 | } |