?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
[DCCP]: Fix uninitialized var warnings in dccp_parse_options().
[linux-2.6/zen-sources.git] / arch / frv / kernel / ptrace.c
blobf953484e7d596eced5666356750f6ef72f2239f6
1 /* ptrace.c: FRV specific parts of process tracing
2 *
3 * Copyright (C) 2003-5 Red Hat, Inc. All Rights Reserved.
4 * Written by David Howells (dhowells@redhat.com)
5 * - Derived from arch/m68k/kernel/ptrace.c
6 *
7 * This program is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU General Public License
9 * as published by the Free Software Foundation; either version
10 * 2 of the License, or (at your option) any later version.
11 */
12
13 #include <linux/kernel.h>
14 #include <linux/sched.h>
15 #include <linux/mm.h>
16 #include <linux/smp.h>
17 #include <linux/smp_lock.h>
18 #include <linux/errno.h>
19 #include <linux/ptrace.h>
20 #include <linux/user.h>
21 #include <linux/config.h>
22 #include <linux/security.h>
23 #include <linux/signal.h>
24
25 #include <asm/uaccess.h>
26 #include <asm/page.h>
27 #include <asm/pgtable.h>
28 #include <asm/system.h>
29 #include <asm/processor.h>
30 #include <asm/unistd.h>
31
32 /*
33 * does not yet catch signals sent when the child dies.
34 * in exit.c or in signal.c.
35 */
36
37 /*
38 * Get contents of register REGNO in task TASK.
39 */
40 static inline long get_reg(struct task_struct *task, int regno)
41 {
42 struct user_context *user = task->thread.user;
43
44 if (regno < 0 || regno >= PT__END)
45 return 0;
46
47 return ((unsigned long *) user)[regno];
48 }
49
50 /*
51 * Write contents of register REGNO in task TASK.
52 */
53 static inline int put_reg(struct task_struct *task, int regno,
54 unsigned long data)
55 {
56 struct user_context *user = task->thread.user;
57
58 if (regno < 0 || regno >= PT__END)
59 return -EIO;
60
61 switch (regno) {
62 case PT_GR(0):
63 return 0;
64 case PT_PSR:
65 case PT__STATUS:
66 return -EIO;
67 default:
68 ((unsigned long *) user)[regno] = data;
69 return 0;
70 }
71 }
72
73 /*
74 * check that an address falls within the bounds of the target process's memory mappings
75 */
76 static inline int is_user_addr_valid(struct task_struct *child,
77 unsigned long start, unsigned long len)
78 {
79 #ifdef CONFIG_MMU
80 if (start >= PAGE_OFFSET || len > PAGE_OFFSET - start)
81 return -EIO;
82 return 0;
83 #else
84 struct vm_list_struct *vml;
85
86 for (vml = child->mm->context.vmlist; vml; vml = vml->next)
87 if (start >= vml->vma->vm_start && start + len <= vml->vma->vm_end)
88 return 0;
89
90 return -EIO;
91 #endif
92 }
93
94 /*
95 * Called by kernel/ptrace.c when detaching..
96 *
97 * Control h/w single stepping
98 */
99 void ptrace_disable(struct task_struct *child)
100 {
101 child->thread.frame0->__status &= ~REG__STATUS_STEP;
102 }
103
104 void ptrace_enable(struct task_struct *child)
105 {
106 child->thread.frame0->__status |= REG__STATUS_STEP;
107 }
108
109 long arch_ptrace(struct task_struct *child, long request, long addr, long data)
110 {
111 unsigned long tmp;
112 int ret;
113
114 switch (request) {
115 /* when I and D space are separate, these will need to be fixed. */
116 case PTRACE_PEEKTEXT: /* read word at location addr. */
117 case PTRACE_PEEKDATA: {
118 int copied;
119
120 ret = -EIO;
121 if (is_user_addr_valid(child, addr, sizeof(tmp)) < 0)
122 break;
123
124 copied = access_process_vm(child, addr, &tmp, sizeof(tmp), 0);
125 if (copied != sizeof(tmp))
126 break;
127
128 ret = put_user(tmp,(unsigned long *) data);
129 break;
130 }
131
132 /* read the word at location addr in the USER area. */
133 case PTRACE_PEEKUSR: {
134 tmp = 0;
135 ret = -EIO;
136 if ((addr & 3) || addr < 0)
137 break;
138
139 ret = 0;
140 switch (addr >> 2) {
141 case 0 ... PT__END - 1:
142 tmp = get_reg(child, addr >> 2);
143 break;
144
145 case PT__END + 0:
146 tmp = child->mm->end_code - child->mm->start_code;
147 break;
148
149 case PT__END + 1:
150 tmp = child->mm->end_data - child->mm->start_data;
151 break;
152
153 case PT__END + 2:
154 tmp = child->mm->start_stack - child->mm->start_brk;
155 break;
156
157 case PT__END + 3:
158 tmp = child->mm->start_code;
159 break;
160
161 case PT__END + 4:
162 tmp = child->mm->start_stack;
163 break;
164
165 default:
166 ret = -EIO;
167 break;
168 }
169
170 if (ret == 0)
171 ret = put_user(tmp, (unsigned long *) data);
172 break;
173 }
174
175 /* when I and D space are separate, this will have to be fixed. */
176 case PTRACE_POKETEXT: /* write the word at location addr. */
177 case PTRACE_POKEDATA:
178 ret = -EIO;
179 if (is_user_addr_valid(child, addr, sizeof(tmp)) < 0)
180 break;
181 if (access_process_vm(child, addr, &data, sizeof(data), 1) != sizeof(data))
182 break;
183 ret = 0;
184 break;
185
186 case PTRACE_POKEUSR: /* write the word at location addr in the USER area */
187 ret = -EIO;
188 if ((addr & 3) || addr < 0)
189 break;
190
191 ret = 0;
192 switch (addr >> 2) {
193 case 0 ... PT__END-1:
194 ret = put_reg(child, addr >> 2, data);
195 break;
196
197 default:
198 ret = -EIO;
199 break;
200 }
201 break;
202
203 case PTRACE_SYSCALL: /* continue and stop at next (return from) syscall */
204 case PTRACE_CONT: /* restart after signal. */
205 ret = -EIO;
206 if (!valid_signal(data))
207 break;
208 if (request == PTRACE_SYSCALL)
209 set_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
210 else
211 clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
212 child->exit_code = data;
213 ptrace_disable(child);
214 wake_up_process(child);
215 ret = 0;
216 break;
217
218 /* make the child exit. Best I can do is send it a sigkill.
219 * perhaps it should be put in the status that it wants to
220 * exit.
221 */
222 case PTRACE_KILL:
223 ret = 0;
224 if (child->exit_state == EXIT_ZOMBIE) /* already dead */
225 break;
226 child->exit_code = SIGKILL;
227 clear_tsk_thread_flag(child, TIF_SINGLESTEP);
228 ptrace_disable(child);
229 wake_up_process(child);
230 break;
231
232 case PTRACE_SINGLESTEP: /* set the trap flag. */
233 ret = -EIO;
234 if (!valid_signal(data))
235 break;
236 clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
237 ptrace_enable(child);
238 child->exit_code = data;
239 wake_up_process(child);
240 ret = 0;
241 break;
242
243 case PTRACE_DETACH: /* detach a process that was attached. */
244 ret = ptrace_detach(child, data);
245 break;
246
247 case PTRACE_GETREGS: { /* Get all integer regs from the child. */
248 int i;
249 for (i = 0; i < PT__GPEND; i++) {
250 tmp = get_reg(child, i);
251 if (put_user(tmp, (unsigned long *) data)) {
252 ret = -EFAULT;
253 break;
254 }
255 data += sizeof(long);
256 }
257 ret = 0;
258 break;
259 }
260
261 case PTRACE_SETREGS: { /* Set all integer regs in the child. */
262 int i;
263 for (i = 0; i < PT__GPEND; i++) {
264 if (get_user(tmp, (unsigned long *) data)) {
265 ret = -EFAULT;
266 break;
267 }
268 put_reg(child, i, tmp);
269 data += sizeof(long);
270 }
271 ret = 0;
272 break;
273 }
274
275 case PTRACE_GETFPREGS: { /* Get the child FP/Media state. */
276 ret = 0;
277 if (copy_to_user((void *) data,
278 &child->thread.user->f,
279 sizeof(child->thread.user->f)))
280 ret = -EFAULT;
281 break;
282 }
283
284 case PTRACE_SETFPREGS: { /* Set the child FP/Media state. */
285 ret = 0;
286 if (copy_from_user(&child->thread.user->f,
287 (void *) data,
288 sizeof(child->thread.user->f)))
289 ret = -EFAULT;
290 break;
291 }
292
293 case PTRACE_GETFDPIC:
294 tmp = 0;
295 switch (addr) {
296 case PTRACE_GETFDPIC_EXEC:
297 tmp = child->mm->context.exec_fdpic_loadmap;
298 break;
299 case PTRACE_GETFDPIC_INTERP:
300 tmp = child->mm->context.interp_fdpic_loadmap;
301 break;
302 default:
303 break;
304 }
305
306 ret = 0;
307 if (put_user(tmp, (unsigned long *) data)) {
308 ret = -EFAULT;
309 break;
310 }
311 break;
312
313 default:
314 ret = -EIO;
315 break;
316 }
317 return ret;
318 }
319
320 int __nongprelbss kstrace;
321
322 static const struct {
323 const char *name;
324 unsigned argmask;
325 } __syscall_name_table[NR_syscalls] = {
326 [0] = { "restart_syscall" },
327 [1] = { "exit", 0x000001 },
328 [2] = { "fork", 0xffffff },
329 [3] = { "read", 0x000141 },
330 [4] = { "write", 0x000141 },
331 [5] = { "open", 0x000235 },
332 [6] = { "close", 0x000001 },
333 [7] = { "waitpid", 0x000141 },
334 [8] = { "creat", 0x000025 },
335 [9] = { "link", 0x000055 },
336 [10] = { "unlink", 0x000005 },
337 [11] = { "execve", 0x000445 },
338 [12] = { "chdir", 0x000005 },
339 [13] = { "time", 0x000004 },
340 [14] = { "mknod", 0x000325 },
341 [15] = { "chmod", 0x000025 },
342 [16] = { "lchown", 0x000025 },
343 [17] = { "break" },
344 [18] = { "oldstat", 0x000045 },
345 [19] = { "lseek", 0x000131 },
346 [20] = { "getpid", 0xffffff },
347 [21] = { "mount", 0x043555 },
348 [22] = { "umount", 0x000005 },
349 [23] = { "setuid", 0x000001 },
350 [24] = { "getuid", 0xffffff },
351 [25] = { "stime", 0x000004 },
352 [26] = { "ptrace", 0x004413 },
353 [27] = { "alarm", 0x000001 },
354 [28] = { "oldfstat", 0x000041 },
355 [29] = { "pause", 0xffffff },
356 [30] = { "utime", 0x000045 },
357 [31] = { "stty" },
358 [32] = { "gtty" },
359 [33] = { "access", 0x000025 },
360 [34] = { "nice", 0x000001 },
361 [35] = { "ftime" },
362 [36] = { "sync", 0xffffff },
363 [37] = { "kill", 0x000011 },
364 [38] = { "rename", 0x000055 },
365 [39] = { "mkdir", 0x000025 },
366 [40] = { "rmdir", 0x000005 },
367 [41] = { "dup", 0x000001 },
368 [42] = { "pipe", 0x000004 },
369 [43] = { "times", 0x000004 },
370 [44] = { "prof" },
371 [45] = { "brk", 0x000004 },
372 [46] = { "setgid", 0x000001 },
373 [47] = { "getgid", 0xffffff },
374 [48] = { "signal", 0x000041 },
375 [49] = { "geteuid", 0xffffff },
376 [50] = { "getegid", 0xffffff },
377 [51] = { "acct", 0x000005 },
378 [52] = { "umount2", 0x000035 },
379 [53] = { "lock" },
380 [54] = { "ioctl", 0x000331 },
381 [55] = { "fcntl", 0x000331 },
382 [56] = { "mpx" },
383 [57] = { "setpgid", 0x000011 },
384 [58] = { "ulimit" },
385 [60] = { "umask", 0x000002 },
386 [61] = { "chroot", 0x000005 },
387 [62] = { "ustat", 0x000043 },
388 [63] = { "dup2", 0x000011 },
389 [64] = { "getppid", 0xffffff },
390 [65] = { "getpgrp", 0xffffff },
391 [66] = { "setsid", 0xffffff },
392 [67] = { "sigaction" },
393 [68] = { "sgetmask" },
394 [69] = { "ssetmask" },
395 [70] = { "setreuid" },
396 [71] = { "setregid" },
397 [72] = { "sigsuspend" },
398 [73] = { "sigpending" },
399 [74] = { "sethostname" },
400 [75] = { "setrlimit" },
401 [76] = { "getrlimit" },
402 [77] = { "getrusage" },
403 [78] = { "gettimeofday" },
404 [79] = { "settimeofday" },
405 [80] = { "getgroups" },
406 [81] = { "setgroups" },
407 [82] = { "select" },
408 [83] = { "symlink" },
409 [84] = { "oldlstat" },
410 [85] = { "readlink" },
411 [86] = { "uselib" },
412 [87] = { "swapon" },
413 [88] = { "reboot" },
414 [89] = { "readdir" },
415 [91] = { "munmap", 0x000034 },
416 [92] = { "truncate" },
417 [93] = { "ftruncate" },
418 [94] = { "fchmod" },
419 [95] = { "fchown" },
420 [96] = { "getpriority" },
421 [97] = { "setpriority" },
422 [99] = { "statfs" },
423 [100] = { "fstatfs" },
424 [102] = { "socketcall" },
425 [103] = { "syslog" },
426 [104] = { "setitimer" },
427 [105] = { "getitimer" },
428 [106] = { "stat" },
429 [107] = { "lstat" },
430 [108] = { "fstat" },
431 [111] = { "vhangup" },
432 [114] = { "wait4" },
433 [115] = { "swapoff" },
434 [116] = { "sysinfo" },
435 [117] = { "ipc" },
436 [118] = { "fsync" },
437 [119] = { "sigreturn" },
438 [120] = { "clone" },
439 [121] = { "setdomainname" },
440 [122] = { "uname" },
441 [123] = { "modify_ldt" },
442 [123] = { "cacheflush" },
443 [124] = { "adjtimex" },
444 [125] = { "mprotect" },
445 [126] = { "sigprocmask" },
446 [127] = { "create_module" },
447 [128] = { "init_module" },
448 [129] = { "delete_module" },
449 [130] = { "get_kernel_syms" },
450 [131] = { "quotactl" },
451 [132] = { "getpgid" },
452 [133] = { "fchdir" },
453 [134] = { "bdflush" },
454 [135] = { "sysfs" },
455 [136] = { "personality" },
456 [137] = { "afs_syscall" },
457 [138] = { "setfsuid" },
458 [139] = { "setfsgid" },
459 [140] = { "_llseek", 0x014331 },
460 [141] = { "getdents" },
461 [142] = { "_newselect", 0x000141 },
462 [143] = { "flock" },
463 [144] = { "msync" },
464 [145] = { "readv" },
465 [146] = { "writev" },
466 [147] = { "getsid", 0x000001 },
467 [148] = { "fdatasync", 0x000001 },
468 [149] = { "_sysctl", 0x000004 },
469 [150] = { "mlock" },
470 [151] = { "munlock" },
471 [152] = { "mlockall" },
472 [153] = { "munlockall" },
473 [154] = { "sched_setparam" },
474 [155] = { "sched_getparam" },
475 [156] = { "sched_setscheduler" },
476 [157] = { "sched_getscheduler" },
477 [158] = { "sched_yield" },
478 [159] = { "sched_get_priority_max" },
479 [160] = { "sched_get_priority_min" },
480 [161] = { "sched_rr_get_interval" },
481 [162] = { "nanosleep", 0x000044 },
482 [163] = { "mremap" },
483 [164] = { "setresuid" },
484 [165] = { "getresuid" },
485 [166] = { "vm86" },
486 [167] = { "query_module" },
487 [168] = { "poll" },
488 [169] = { "nfsservctl" },
489 [170] = { "setresgid" },
490 [171] = { "getresgid" },
491 [172] = { "prctl", 0x333331 },
492 [173] = { "rt_sigreturn", 0xffffff },
493 [174] = { "rt_sigaction", 0x001441 },
494 [175] = { "rt_sigprocmask", 0x001441 },
495 [176] = { "rt_sigpending", 0x000014 },
496 [177] = { "rt_sigtimedwait", 0x001444 },
497 [178] = { "rt_sigqueueinfo", 0x000411 },
498 [179] = { "rt_sigsuspend", 0x000014 },
499 [180] = { "pread", 0x003341 },
500 [181] = { "pwrite", 0x003341 },
501 [182] = { "chown", 0x000115 },
502 [183] = { "getcwd" },
503 [184] = { "capget" },
504 [185] = { "capset" },
505 [186] = { "sigaltstack" },
506 [187] = { "sendfile" },
507 [188] = { "getpmsg" },
508 [189] = { "putpmsg" },
509 [190] = { "vfork", 0xffffff },
510 [191] = { "ugetrlimit" },
511 [192] = { "mmap2", 0x313314 },
512 [193] = { "truncate64" },
513 [194] = { "ftruncate64" },
514 [195] = { "stat64", 0x000045 },
515 [196] = { "lstat64", 0x000045 },
516 [197] = { "fstat64", 0x000041 },
517 [198] = { "lchown32" },
518 [199] = { "getuid32", 0xffffff },
519 [200] = { "getgid32", 0xffffff },
520 [201] = { "geteuid32", 0xffffff },
521 [202] = { "getegid32", 0xffffff },
522 [203] = { "setreuid32" },
523 [204] = { "setregid32" },
524 [205] = { "getgroups32" },
525 [206] = { "setgroups32" },
526 [207] = { "fchown32" },
527 [208] = { "setresuid32" },
528 [209] = { "getresuid32" },
529 [210] = { "setresgid32" },
530 [211] = { "getresgid32" },
531 [212] = { "chown32" },
532 [213] = { "setuid32" },
533 [214] = { "setgid32" },
534 [215] = { "setfsuid32" },
535 [216] = { "setfsgid32" },
536 [217] = { "pivot_root" },
537 [218] = { "mincore" },
538 [219] = { "madvise" },
539 [220] = { "getdents64" },
540 [221] = { "fcntl64" },
541 [223] = { "security" },
542 [224] = { "gettid" },
543 [225] = { "readahead" },
544 [226] = { "setxattr" },
545 [227] = { "lsetxattr" },
546 [228] = { "fsetxattr" },
547 [229] = { "getxattr" },
548 [230] = { "lgetxattr" },
549 [231] = { "fgetxattr" },
550 [232] = { "listxattr" },
551 [233] = { "llistxattr" },
552 [234] = { "flistxattr" },
553 [235] = { "removexattr" },
554 [236] = { "lremovexattr" },
555 [237] = { "fremovexattr" },
556 [238] = { "tkill" },
557 [239] = { "sendfile64" },
558 [240] = { "futex" },
559 [241] = { "sched_setaffinity" },
560 [242] = { "sched_getaffinity" },
561 [243] = { "set_thread_area" },
562 [244] = { "get_thread_area" },
563 [245] = { "io_setup" },
564 [246] = { "io_destroy" },
565 [247] = { "io_getevents" },
566 [248] = { "io_submit" },
567 [249] = { "io_cancel" },
568 [250] = { "fadvise64" },
569 [252] = { "exit_group", 0x000001 },
570 [253] = { "lookup_dcookie" },
571 [254] = { "epoll_create" },
572 [255] = { "epoll_ctl" },
573 [256] = { "epoll_wait" },
574 [257] = { "remap_file_pages" },
575 [258] = { "set_tid_address" },
576 [259] = { "timer_create" },
577 [260] = { "timer_settime" },
578 [261] = { "timer_gettime" },
579 [262] = { "timer_getoverrun" },
580 [263] = { "timer_delete" },
581 [264] = { "clock_settime" },
582 [265] = { "clock_gettime" },
583 [266] = { "clock_getres" },
584 [267] = { "clock_nanosleep" },
585 [268] = { "statfs64" },
586 [269] = { "fstatfs64" },
587 [270] = { "tgkill" },
588 [271] = { "utimes" },
589 [272] = { "fadvise64_64" },
590 [273] = { "vserver" },
591 [274] = { "mbind" },
592 [275] = { "get_mempolicy" },
593 [276] = { "set_mempolicy" },
594 [277] = { "mq_open" },
595 [278] = { "mq_unlink" },
596 [279] = { "mq_timedsend" },
597 [280] = { "mq_timedreceive" },
598 [281] = { "mq_notify" },
599 [282] = { "mq_getsetattr" },
600 [283] = { "sys_kexec_load" },
601 };
602
603 asmlinkage void do_syscall_trace(int leaving)
604 {
605 #if 0
606 unsigned long *argp;
607 const char *name;
608 unsigned argmask;
609 char buffer[16];
610
611 if (!kstrace)
612 return;
613
614 if (!current->mm)
615 return;
616
617 if (__frame->gr7 == __NR_close)
618 return;
619
620 #if 0
621 if (__frame->gr7 != __NR_mmap2 &&
622 __frame->gr7 != __NR_vfork &&
623 __frame->gr7 != __NR_execve &&
624 __frame->gr7 != __NR_exit)
625 return;
626 #endif
627
628 argmask = 0;
629 name = NULL;
630 if (__frame->gr7 < NR_syscalls) {
631 name = __syscall_name_table[__frame->gr7].name;
632 argmask = __syscall_name_table[__frame->gr7].argmask;
633 }
634 if (!name) {
635 sprintf(buffer, "sys_%lx", __frame->gr7);
636 name = buffer;
637 }
638
639 if (!leaving) {
640 if (!argmask) {
641 printk(KERN_CRIT "[%d] %s(%lx,%lx,%lx,%lx,%lx,%lx)\n",
642 current->pid,
643 name,
644 __frame->gr8,
645 __frame->gr9,
646 __frame->gr10,
647 __frame->gr11,
648 __frame->gr12,
649 __frame->gr13);
650 }
651 else if (argmask == 0xffffff) {
652 printk(KERN_CRIT "[%d] %s()\n",
653 current->pid,
654 name);
655 }
656 else {
657 printk(KERN_CRIT "[%d] %s(",
658 current->pid,
659 name);
660
661 argp = &__frame->gr8;
662
663 do {
664 switch (argmask & 0xf) {
665 case 1:
666 printk("%ld", (long) *argp);
667 break;
668 case 2:
669 printk("%lo", *argp);
670 break;
671 case 3:
672 printk("%lx", *argp);
673 break;
674 case 4:
675 printk("%p", (void *) *argp);
676 break;
677 case 5:
678 printk("\"%s\"", (char *) *argp);
679 break;
680 }
681
682 argp++;
683 argmask >>= 4;
684 if (argmask)
685 printk(",");
686
687 } while (argmask);
688
689 printk(")\n");
690 }
691 }
692 else {
693 if ((int)__frame->gr8 > -4096 && (int)__frame->gr8 < 4096)
694 printk(KERN_CRIT "[%d] %s() = %ld\n", current->pid, name, __frame->gr8);
695 else
696 printk(KERN_CRIT "[%d] %s() = %lx\n", current->pid, name, __frame->gr8);
697 }
698 return;
699 #endif
700
701 if (!test_thread_flag(TIF_SYSCALL_TRACE))
702 return;
703
704 if (!(current->ptrace & PT_PTRACED))
705 return;
706
707 /* we need to indicate entry or exit to strace */
708 if (leaving)
709 __frame->__status |= REG__STATUS_SYSC_EXIT;
710 else
711 __frame->__status |= REG__STATUS_SYSC_ENTRY;
712
713 ptrace_notify(SIGTRAP);
714
715 /*
716 * this isn't the same as continuing with a signal, but it will do
717 * for normal use. strace only continues with a signal if the
718 * stopping signal is not SIGTRAP. -brl
719 */
720 if (current->exit_code) {
721 send_sig(current->exit_code, current, 1);
722 current->exit_code = 0;
723 }
724 }
Stable & featurefull patchset based on Linus's git branch