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Linux 2.6.28-rc5
[cris-mirror.git] / arch / frv / kernel / ptrace.c
blob709e9bdc6126de06417624a0edd8297dca38dc22
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/errno.h>
18 #include <linux/ptrace.h>
19 #include <linux/user.h>
20 #include <linux/security.h>
21 #include <linux/signal.h>
22
23 #include <asm/uaccess.h>
24 #include <asm/page.h>
25 #include <asm/pgtable.h>
26 #include <asm/system.h>
27 #include <asm/processor.h>
28 #include <asm/unistd.h>
29
30 /*
31 * does not yet catch signals sent when the child dies.
32 * in exit.c or in signal.c.
33 */
34
35 /*
36 * Get contents of register REGNO in task TASK.
37 */
38 static inline long get_reg(struct task_struct *task, int regno)
39 {
40 struct user_context *user = task->thread.user;
41
42 if (regno < 0 || regno >= PT__END)
43 return 0;
44
45 return ((unsigned long *) user)[regno];
46 }
47
48 /*
49 * Write contents of register REGNO in task TASK.
50 */
51 static inline int put_reg(struct task_struct *task, int regno,
52 unsigned long data)
53 {
54 struct user_context *user = task->thread.user;
55
56 if (regno < 0 || regno >= PT__END)
57 return -EIO;
58
59 switch (regno) {
60 case PT_GR(0):
61 return 0;
62 case PT_PSR:
63 case PT__STATUS:
64 return -EIO;
65 default:
66 ((unsigned long *) user)[regno] = data;
67 return 0;
68 }
69 }
70
71 /*
72 * check that an address falls within the bounds of the target process's memory mappings
73 */
74 static inline int is_user_addr_valid(struct task_struct *child,
75 unsigned long start, unsigned long len)
76 {
77 #ifdef CONFIG_MMU
78 if (start >= PAGE_OFFSET || len > PAGE_OFFSET - start)
79 return -EIO;
80 return 0;
81 #else
82 struct vm_list_struct *vml;
83
84 for (vml = child->mm->context.vmlist; vml; vml = vml->next)
85 if (start >= vml->vma->vm_start && start + len <= vml->vma->vm_end)
86 return 0;
87
88 return -EIO;
89 #endif
90 }
91
92 /*
93 * Called by kernel/ptrace.c when detaching..
94 *
95 * Control h/w single stepping
96 */
97 void ptrace_disable(struct task_struct *child)
98 {
99 child->thread.frame0->__status &= ~REG__STATUS_STEP;
100 }
101
102 void ptrace_enable(struct task_struct *child)
103 {
104 child->thread.frame0->__status |= REG__STATUS_STEP;
105 }
106
107 long arch_ptrace(struct task_struct *child, long request, long addr, long data)
108 {
109 unsigned long tmp;
110 int ret;
111
112 switch (request) {
113 /* when I and D space are separate, these will need to be fixed. */
114 case PTRACE_PEEKTEXT: /* read word at location addr. */
115 case PTRACE_PEEKDATA:
116 ret = -EIO;
117 if (is_user_addr_valid(child, addr, sizeof(tmp)) < 0)
118 break;
119 ret = generic_ptrace_peekdata(child, addr, data);
120 break;
121
122 /* read the word at location addr in the USER area. */
123 case PTRACE_PEEKUSR: {
124 tmp = 0;
125 ret = -EIO;
126 if ((addr & 3) || addr < 0)
127 break;
128
129 ret = 0;
130 switch (addr >> 2) {
131 case 0 ... PT__END - 1:
132 tmp = get_reg(child, addr >> 2);
133 break;
134
135 case PT__END + 0:
136 tmp = child->mm->end_code - child->mm->start_code;
137 break;
138
139 case PT__END + 1:
140 tmp = child->mm->end_data - child->mm->start_data;
141 break;
142
143 case PT__END + 2:
144 tmp = child->mm->start_stack - child->mm->start_brk;
145 break;
146
147 case PT__END + 3:
148 tmp = child->mm->start_code;
149 break;
150
151 case PT__END + 4:
152 tmp = child->mm->start_stack;
153 break;
154
155 default:
156 ret = -EIO;
157 break;
158 }
159
160 if (ret == 0)
161 ret = put_user(tmp, (unsigned long *) data);
162 break;
163 }
164
165 /* when I and D space are separate, this will have to be fixed. */
166 case PTRACE_POKETEXT: /* write the word at location addr. */
167 case PTRACE_POKEDATA:
168 ret = -EIO;
169 if (is_user_addr_valid(child, addr, sizeof(tmp)) < 0)
170 break;
171 ret = generic_ptrace_pokedata(child, addr, data);
172 break;
173
174 case PTRACE_POKEUSR: /* write the word at location addr in the USER area */
175 ret = -EIO;
176 if ((addr & 3) || addr < 0)
177 break;
178
179 ret = 0;
180 switch (addr >> 2) {
181 case 0 ... PT__END-1:
182 ret = put_reg(child, addr >> 2, data);
183 break;
184
185 default:
186 ret = -EIO;
187 break;
188 }
189 break;
190
191 case PTRACE_SYSCALL: /* continue and stop at next (return from) syscall */
192 case PTRACE_CONT: /* restart after signal. */
193 ret = -EIO;
194 if (!valid_signal(data))
195 break;
196 if (request == PTRACE_SYSCALL)
197 set_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
198 else
199 clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
200 child->exit_code = data;
201 ptrace_disable(child);
202 wake_up_process(child);
203 ret = 0;
204 break;
205
206 /* make the child exit. Best I can do is send it a sigkill.
207 * perhaps it should be put in the status that it wants to
208 * exit.
209 */
210 case PTRACE_KILL:
211 ret = 0;
212 if (child->exit_state == EXIT_ZOMBIE) /* already dead */
213 break;
214 child->exit_code = SIGKILL;
215 clear_tsk_thread_flag(child, TIF_SINGLESTEP);
216 ptrace_disable(child);
217 wake_up_process(child);
218 break;
219
220 case PTRACE_SINGLESTEP: /* set the trap flag. */
221 ret = -EIO;
222 if (!valid_signal(data))
223 break;
224 clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
225 ptrace_enable(child);
226 child->exit_code = data;
227 wake_up_process(child);
228 ret = 0;
229 break;
230
231 case PTRACE_DETACH: /* detach a process that was attached. */
232 ret = ptrace_detach(child, data);
233 break;
234
235 case PTRACE_GETREGS: { /* Get all integer regs from the child. */
236 int i;
237 for (i = 0; i < PT__GPEND; i++) {
238 tmp = get_reg(child, i);
239 if (put_user(tmp, (unsigned long *) data)) {
240 ret = -EFAULT;
241 break;
242 }
243 data += sizeof(long);
244 }
245 ret = 0;
246 break;
247 }
248
249 case PTRACE_SETREGS: { /* Set all integer regs in the child. */
250 int i;
251 for (i = 0; i < PT__GPEND; i++) {
252 if (get_user(tmp, (unsigned long *) data)) {
253 ret = -EFAULT;
254 break;
255 }
256 put_reg(child, i, tmp);
257 data += sizeof(long);
258 }
259 ret = 0;
260 break;
261 }
262
263 case PTRACE_GETFPREGS: { /* Get the child FP/Media state. */
264 ret = 0;
265 if (copy_to_user((void *) data,
266 &child->thread.user->f,
267 sizeof(child->thread.user->f)))
268 ret = -EFAULT;
269 break;
270 }
271
272 case PTRACE_SETFPREGS: { /* Set the child FP/Media state. */
273 ret = 0;
274 if (copy_from_user(&child->thread.user->f,
275 (void *) data,
276 sizeof(child->thread.user->f)))
277 ret = -EFAULT;
278 break;
279 }
280
281 case PTRACE_GETFDPIC:
282 tmp = 0;
283 switch (addr) {
284 case PTRACE_GETFDPIC_EXEC:
285 tmp = child->mm->context.exec_fdpic_loadmap;
286 break;
287 case PTRACE_GETFDPIC_INTERP:
288 tmp = child->mm->context.interp_fdpic_loadmap;
289 break;
290 default:
291 break;
292 }
293
294 ret = 0;
295 if (put_user(tmp, (unsigned long *) data)) {
296 ret = -EFAULT;
297 break;
298 }
299 break;
300
301 default:
302 ret = -EIO;
303 break;
304 }
305 return ret;
306 }
307
308 int __nongprelbss kstrace;
309
310 static const struct {
311 const char *name;
312 unsigned argmask;
313 } __syscall_name_table[NR_syscalls] = {
314 [0] = { "restart_syscall" },
315 [1] = { "exit", 0x000001 },
316 [2] = { "fork", 0xffffff },
317 [3] = { "read", 0x000141 },
318 [4] = { "write", 0x000141 },
319 [5] = { "open", 0x000235 },
320 [6] = { "close", 0x000001 },
321 [7] = { "waitpid", 0x000141 },
322 [8] = { "creat", 0x000025 },
323 [9] = { "link", 0x000055 },
324 [10] = { "unlink", 0x000005 },
325 [11] = { "execve", 0x000445 },
326 [12] = { "chdir", 0x000005 },
327 [13] = { "time", 0x000004 },
328 [14] = { "mknod", 0x000325 },
329 [15] = { "chmod", 0x000025 },
330 [16] = { "lchown", 0x000025 },
331 [17] = { "break" },
332 [18] = { "oldstat", 0x000045 },
333 [19] = { "lseek", 0x000131 },
334 [20] = { "getpid", 0xffffff },
335 [21] = { "mount", 0x043555 },
336 [22] = { "umount", 0x000005 },
337 [23] = { "setuid", 0x000001 },
338 [24] = { "getuid", 0xffffff },
339 [25] = { "stime", 0x000004 },
340 [26] = { "ptrace", 0x004413 },
341 [27] = { "alarm", 0x000001 },
342 [28] = { "oldfstat", 0x000041 },
343 [29] = { "pause", 0xffffff },
344 [30] = { "utime", 0x000045 },
345 [31] = { "stty" },
346 [32] = { "gtty" },
347 [33] = { "access", 0x000025 },
348 [34] = { "nice", 0x000001 },
349 [35] = { "ftime" },
350 [36] = { "sync", 0xffffff },
351 [37] = { "kill", 0x000011 },
352 [38] = { "rename", 0x000055 },
353 [39] = { "mkdir", 0x000025 },
354 [40] = { "rmdir", 0x000005 },
355 [41] = { "dup", 0x000001 },
356 [42] = { "pipe", 0x000004 },
357 [43] = { "times", 0x000004 },
358 [44] = { "prof" },
359 [45] = { "brk", 0x000004 },
360 [46] = { "setgid", 0x000001 },
361 [47] = { "getgid", 0xffffff },
362 [48] = { "signal", 0x000041 },
363 [49] = { "geteuid", 0xffffff },
364 [50] = { "getegid", 0xffffff },
365 [51] = { "acct", 0x000005 },
366 [52] = { "umount2", 0x000035 },
367 [53] = { "lock" },
368 [54] = { "ioctl", 0x000331 },
369 [55] = { "fcntl", 0x000331 },
370 [56] = { "mpx" },
371 [57] = { "setpgid", 0x000011 },
372 [58] = { "ulimit" },
373 [60] = { "umask", 0x000002 },
374 [61] = { "chroot", 0x000005 },
375 [62] = { "ustat", 0x000043 },
376 [63] = { "dup2", 0x000011 },
377 [64] = { "getppid", 0xffffff },
378 [65] = { "getpgrp", 0xffffff },
379 [66] = { "setsid", 0xffffff },
380 [67] = { "sigaction" },
381 [68] = { "sgetmask" },
382 [69] = { "ssetmask" },
383 [70] = { "setreuid" },
384 [71] = { "setregid" },
385 [72] = { "sigsuspend" },
386 [73] = { "sigpending" },
387 [74] = { "sethostname" },
388 [75] = { "setrlimit" },
389 [76] = { "getrlimit" },
390 [77] = { "getrusage" },
391 [78] = { "gettimeofday" },
392 [79] = { "settimeofday" },
393 [80] = { "getgroups" },
394 [81] = { "setgroups" },
395 [82] = { "select" },
396 [83] = { "symlink" },
397 [84] = { "oldlstat" },
398 [85] = { "readlink" },
399 [86] = { "uselib" },
400 [87] = { "swapon" },
401 [88] = { "reboot" },
402 [89] = { "readdir" },
403 [91] = { "munmap", 0x000034 },
404 [92] = { "truncate" },
405 [93] = { "ftruncate" },
406 [94] = { "fchmod" },
407 [95] = { "fchown" },
408 [96] = { "getpriority" },
409 [97] = { "setpriority" },
410 [99] = { "statfs" },
411 [100] = { "fstatfs" },
412 [102] = { "socketcall" },
413 [103] = { "syslog" },
414 [104] = { "setitimer" },
415 [105] = { "getitimer" },
416 [106] = { "stat" },
417 [107] = { "lstat" },
418 [108] = { "fstat" },
419 [111] = { "vhangup" },
420 [114] = { "wait4" },
421 [115] = { "swapoff" },
422 [116] = { "sysinfo" },
423 [117] = { "ipc" },
424 [118] = { "fsync" },
425 [119] = { "sigreturn" },
426 [120] = { "clone" },
427 [121] = { "setdomainname" },
428 [122] = { "uname" },
429 [123] = { "modify_ldt" },
430 [123] = { "cacheflush" },
431 [124] = { "adjtimex" },
432 [125] = { "mprotect" },
433 [126] = { "sigprocmask" },
434 [127] = { "create_module" },
435 [128] = { "init_module" },
436 [129] = { "delete_module" },
437 [130] = { "get_kernel_syms" },
438 [131] = { "quotactl" },
439 [132] = { "getpgid" },
440 [133] = { "fchdir" },
441 [134] = { "bdflush" },
442 [135] = { "sysfs" },
443 [136] = { "personality" },
444 [137] = { "afs_syscall" },
445 [138] = { "setfsuid" },
446 [139] = { "setfsgid" },
447 [140] = { "_llseek", 0x014331 },
448 [141] = { "getdents" },
449 [142] = { "_newselect", 0x000141 },
450 [143] = { "flock" },
451 [144] = { "msync" },
452 [145] = { "readv" },
453 [146] = { "writev" },
454 [147] = { "getsid", 0x000001 },
455 [148] = { "fdatasync", 0x000001 },
456 [149] = { "_sysctl", 0x000004 },
457 [150] = { "mlock" },
458 [151] = { "munlock" },
459 [152] = { "mlockall" },
460 [153] = { "munlockall" },
461 [154] = { "sched_setparam" },
462 [155] = { "sched_getparam" },
463 [156] = { "sched_setscheduler" },
464 [157] = { "sched_getscheduler" },
465 [158] = { "sched_yield" },
466 [159] = { "sched_get_priority_max" },
467 [160] = { "sched_get_priority_min" },
468 [161] = { "sched_rr_get_interval" },
469 [162] = { "nanosleep", 0x000044 },
470 [163] = { "mremap" },
471 [164] = { "setresuid" },
472 [165] = { "getresuid" },
473 [166] = { "vm86" },
474 [167] = { "query_module" },
475 [168] = { "poll" },
476 [169] = { "nfsservctl" },
477 [170] = { "setresgid" },
478 [171] = { "getresgid" },
479 [172] = { "prctl", 0x333331 },
480 [173] = { "rt_sigreturn", 0xffffff },
481 [174] = { "rt_sigaction", 0x001441 },
482 [175] = { "rt_sigprocmask", 0x001441 },
483 [176] = { "rt_sigpending", 0x000014 },
484 [177] = { "rt_sigtimedwait", 0x001444 },
485 [178] = { "rt_sigqueueinfo", 0x000411 },
486 [179] = { "rt_sigsuspend", 0x000014 },
487 [180] = { "pread", 0x003341 },
488 [181] = { "pwrite", 0x003341 },
489 [182] = { "chown", 0x000115 },
490 [183] = { "getcwd" },
491 [184] = { "capget" },
492 [185] = { "capset" },
493 [186] = { "sigaltstack" },
494 [187] = { "sendfile" },
495 [188] = { "getpmsg" },
496 [189] = { "putpmsg" },
497 [190] = { "vfork", 0xffffff },
498 [191] = { "ugetrlimit" },
499 [192] = { "mmap2", 0x313314 },
500 [193] = { "truncate64" },
501 [194] = { "ftruncate64" },
502 [195] = { "stat64", 0x000045 },
503 [196] = { "lstat64", 0x000045 },
504 [197] = { "fstat64", 0x000041 },
505 [198] = { "lchown32" },
506 [199] = { "getuid32", 0xffffff },
507 [200] = { "getgid32", 0xffffff },
508 [201] = { "geteuid32", 0xffffff },
509 [202] = { "getegid32", 0xffffff },
510 [203] = { "setreuid32" },
511 [204] = { "setregid32" },
512 [205] = { "getgroups32" },
513 [206] = { "setgroups32" },
514 [207] = { "fchown32" },
515 [208] = { "setresuid32" },
516 [209] = { "getresuid32" },
517 [210] = { "setresgid32" },
518 [211] = { "getresgid32" },
519 [212] = { "chown32" },
520 [213] = { "setuid32" },
521 [214] = { "setgid32" },
522 [215] = { "setfsuid32" },
523 [216] = { "setfsgid32" },
524 [217] = { "pivot_root" },
525 [218] = { "mincore" },
526 [219] = { "madvise" },
527 [220] = { "getdents64" },
528 [221] = { "fcntl64" },
529 [223] = { "security" },
530 [224] = { "gettid" },
531 [225] = { "readahead" },
532 [226] = { "setxattr" },
533 [227] = { "lsetxattr" },
534 [228] = { "fsetxattr" },
535 [229] = { "getxattr" },
536 [230] = { "lgetxattr" },
537 [231] = { "fgetxattr" },
538 [232] = { "listxattr" },
539 [233] = { "llistxattr" },
540 [234] = { "flistxattr" },
541 [235] = { "removexattr" },
542 [236] = { "lremovexattr" },
543 [237] = { "fremovexattr" },
544 [238] = { "tkill" },
545 [239] = { "sendfile64" },
546 [240] = { "futex" },
547 [241] = { "sched_setaffinity" },
548 [242] = { "sched_getaffinity" },
549 [243] = { "set_thread_area" },
550 [244] = { "get_thread_area" },
551 [245] = { "io_setup" },
552 [246] = { "io_destroy" },
553 [247] = { "io_getevents" },
554 [248] = { "io_submit" },
555 [249] = { "io_cancel" },
556 [250] = { "fadvise64" },
557 [252] = { "exit_group", 0x000001 },
558 [253] = { "lookup_dcookie" },
559 [254] = { "epoll_create" },
560 [255] = { "epoll_ctl" },
561 [256] = { "epoll_wait" },
562 [257] = { "remap_file_pages" },
563 [258] = { "set_tid_address" },
564 [259] = { "timer_create" },
565 [260] = { "timer_settime" },
566 [261] = { "timer_gettime" },
567 [262] = { "timer_getoverrun" },
568 [263] = { "timer_delete" },
569 [264] = { "clock_settime" },
570 [265] = { "clock_gettime" },
571 [266] = { "clock_getres" },
572 [267] = { "clock_nanosleep" },
573 [268] = { "statfs64" },
574 [269] = { "fstatfs64" },
575 [270] = { "tgkill" },
576 [271] = { "utimes" },
577 [272] = { "fadvise64_64" },
578 [273] = { "vserver" },
579 [274] = { "mbind" },
580 [275] = { "get_mempolicy" },
581 [276] = { "set_mempolicy" },
582 [277] = { "mq_open" },
583 [278] = { "mq_unlink" },
584 [279] = { "mq_timedsend" },
585 [280] = { "mq_timedreceive" },
586 [281] = { "mq_notify" },
587 [282] = { "mq_getsetattr" },
588 [283] = { "sys_kexec_load" },
589 };
590
591 asmlinkage void do_syscall_trace(int leaving)
592 {
593 #if 0
594 unsigned long *argp;
595 const char *name;
596 unsigned argmask;
597 char buffer[16];
598
599 if (!kstrace)
600 return;
601
602 if (!current->mm)
603 return;
604
605 if (__frame->gr7 == __NR_close)
606 return;
607
608 #if 0
609 if (__frame->gr7 != __NR_mmap2 &&
610 __frame->gr7 != __NR_vfork &&
611 __frame->gr7 != __NR_execve &&
612 __frame->gr7 != __NR_exit)
613 return;
614 #endif
615
616 argmask = 0;
617 name = NULL;
618 if (__frame->gr7 < NR_syscalls) {
619 name = __syscall_name_table[__frame->gr7].name;
620 argmask = __syscall_name_table[__frame->gr7].argmask;
621 }
622 if (!name) {
623 sprintf(buffer, "sys_%lx", __frame->gr7);
624 name = buffer;
625 }
626
627 if (!leaving) {
628 if (!argmask) {
629 printk(KERN_CRIT "[%d] %s(%lx,%lx,%lx,%lx,%lx,%lx)\n",
630 current->pid,
631 name,
632 __frame->gr8,
633 __frame->gr9,
634 __frame->gr10,
635 __frame->gr11,
636 __frame->gr12,
637 __frame->gr13);
638 }
639 else if (argmask == 0xffffff) {
640 printk(KERN_CRIT "[%d] %s()\n",
641 current->pid,
642 name);
643 }
644 else {
645 printk(KERN_CRIT "[%d] %s(",
646 current->pid,
647 name);
648
649 argp = &__frame->gr8;
650
651 do {
652 switch (argmask & 0xf) {
653 case 1:
654 printk("%ld", (long) *argp);
655 break;
656 case 2:
657 printk("%lo", *argp);
658 break;
659 case 3:
660 printk("%lx", *argp);
661 break;
662 case 4:
663 printk("%p", (void *) *argp);
664 break;
665 case 5:
666 printk("\"%s\"", (char *) *argp);
667 break;
668 }
669
670 argp++;
671 argmask >>= 4;
672 if (argmask)
673 printk(",");
674
675 } while (argmask);
676
677 printk(")\n");
678 }
679 }
680 else {
681 if ((int)__frame->gr8 > -4096 && (int)__frame->gr8 < 4096)
682 printk(KERN_CRIT "[%d] %s() = %ld\n", current->pid, name, __frame->gr8);
683 else
684 printk(KERN_CRIT "[%d] %s() = %lx\n", current->pid, name, __frame->gr8);
685 }
686 return;
687 #endif
688
689 if (!test_thread_flag(TIF_SYSCALL_TRACE))
690 return;
691
692 if (!(current->ptrace & PT_PTRACED))
693 return;
694
695 /* we need to indicate entry or exit to strace */
696 if (leaving)
697 __frame->__status |= REG__STATUS_SYSC_EXIT;
698 else
699 __frame->__status |= REG__STATUS_SYSC_ENTRY;
700
701 ptrace_notify(SIGTRAP);
702
703 /*
704 * this isn't the same as continuing with a signal, but it will do
705 * for normal use. strace only continues with a signal if the
706 * stopping signal is not SIGTRAP. -brl
707 */
708 if (current->exit_code) {
709 send_sig(current->exit_code, current, 1);
710 current->exit_code = 0;
711 }
712 }
CRIS linux kernel tree