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[PATCH] convert that currently tests _NSIG directly to use valid_signal()
[linux-2.6-block.git] / arch / sparc / kernel / ptrace.c
CommitLineData
1da177e4
LT		 1/* ptrace.c: Sparc process tracing support.
2 *
3 * Copyright (C) 1996 David S. Miller (davem@caipfs.rutgers.edu)
4 *
5 * Based upon code written by Ross Biro, Linus Torvalds, Bob Manson,
6 * and David Mosberger.
7 *
8 * Added Linux support -miguel (weird, eh?, the orignal code was meant
9 * to emulate SunOS).
10 */
11
12#include <linux/kernel.h>
13#include <linux/sched.h>
14#include <linux/mm.h>
15#include <linux/errno.h>
16#include <linux/ptrace.h>
17#include <linux/user.h>
18#include <linux/smp.h>
19#include <linux/smp_lock.h>
20#include <linux/security.h>
7ed20e1a 21#include <linux/signal.h>
1da177e4
LT		 22
23#include <asm/pgtable.h>
24#include <asm/system.h>
25#include <asm/uaccess.h>
26
27#define MAGIC_CONSTANT 0x80000000
28
29
30/* Returning from ptrace is a bit tricky because the syscall return
31 * low level code assumes any value returned which is negative and
32 * is a valid errno will mean setting the condition codes to indicate
33 * an error return. This doesn't work, so we have this hook.
34 */
35static inline void pt_error_return(struct pt_regs *regs, unsigned long error)
36{
37 regs->u_regs[UREG_I0] = error;
38 regs->psr |= PSR_C;
39 regs->pc = regs->npc;
40 regs->npc += 4;
41}
42
43static inline void pt_succ_return(struct pt_regs *regs, unsigned long value)
44{
45 regs->u_regs[UREG_I0] = value;
46 regs->psr &= ~PSR_C;
47 regs->pc = regs->npc;
48 regs->npc += 4;
49}
50
51static void
52pt_succ_return_linux(struct pt_regs *regs, unsigned long value, long __user *addr)
53{
54 if (put_user(value, addr)) {
55 pt_error_return(regs, EFAULT);
56 return;
57 }
58 regs->u_regs[UREG_I0] = 0;
59 regs->psr &= ~PSR_C;
60 regs->pc = regs->npc;
61 regs->npc += 4;
62}
63
64static void
65pt_os_succ_return (struct pt_regs *regs, unsigned long val, long __user *addr)
66{
67 if (current->personality == PER_SUNOS)
68 pt_succ_return (regs, val);
69 else
70 pt_succ_return_linux (regs, val, addr);
71}
72
73/* Fuck me gently with a chainsaw... */
74static inline void read_sunos_user(struct pt_regs *regs, unsigned long offset,
75 struct task_struct *tsk, long __user *addr)
76{
77 struct pt_regs *cregs = tsk->thread.kregs;
78 struct thread_info *t = tsk->thread_info;
79 int v;
80
81 if(offset >= 1024)
82 offset -= 1024; /* whee... */
83 if(offset & ((sizeof(unsigned long) - 1))) {
84 pt_error_return(regs, EIO);
85 return;
86 }
87 if(offset >= 16 && offset < 784) {
88 offset -= 16; offset >>= 2;
89 pt_os_succ_return(regs, *(((unsigned long *)(&t->reg_window[0]))+offset), addr);
90 return;
91 }
92 if(offset >= 784 && offset < 832) {
93 offset -= 784; offset >>= 2;
94 pt_os_succ_return(regs, *(((unsigned long *)(&t->rwbuf_stkptrs[0]))+offset), addr);
95 return;
96 }
97 switch(offset) {
98 case 0:
99 v = t->ksp;
100 break;
101 case 4:
102 v = t->kpc;
103 break;
104 case 8:
105 v = t->kpsr;
106 break;
107 case 12:
108 v = t->uwinmask;
109 break;
110 case 832:
111 v = t->w_saved;
112 break;
113 case 896:
114 v = cregs->u_regs[UREG_I0];
115 break;
116 case 900:
117 v = cregs->u_regs[UREG_I1];
118 break;
119 case 904:
120 v = cregs->u_regs[UREG_I2];
121 break;
122 case 908:
123 v = cregs->u_regs[UREG_I3];
124 break;
125 case 912:
126 v = cregs->u_regs[UREG_I4];
127 break;
128 case 916:
129 v = cregs->u_regs[UREG_I5];
130 break;
131 case 920:
132 v = cregs->u_regs[UREG_I6];
133 break;
134 case 924:
135 if(tsk->thread.flags & MAGIC_CONSTANT)
136 v = cregs->u_regs[UREG_G1];
137 else
138 v = 0;
139 break;
140 case 940:
141 v = cregs->u_regs[UREG_I0];
142 break;
143 case 944:
144 v = cregs->u_regs[UREG_I1];
145 break;
146
147 case 948:
148 /* Isn't binary compatibility _fun_??? */
149 if(cregs->psr & PSR_C)
150 v = cregs->u_regs[UREG_I0] << 24;
151 else
152 v = 0;
153 break;
154
155 /* Rest of them are completely unsupported. */
156 default:
157 printk("%s [%d]: Wants to read user offset %ld\n",
158 current->comm, current->pid, offset);
159 pt_error_return(regs, EIO);
160 return;
161 }
162 if (current->personality == PER_SUNOS)
163 pt_succ_return (regs, v);
164 else
165 pt_succ_return_linux (regs, v, addr);
166 return;
167}
168
169static inline void write_sunos_user(struct pt_regs *regs, unsigned long offset,
170 struct task_struct *tsk)
171{
172 struct pt_regs *cregs = tsk->thread.kregs;
173 struct thread_info *t = tsk->thread_info;
174 unsigned long value = regs->u_regs[UREG_I3];
175
176 if(offset >= 1024)
177 offset -= 1024; /* whee... */
178 if(offset & ((sizeof(unsigned long) - 1)))
179 goto failure;
180 if(offset >= 16 && offset < 784) {
181 offset -= 16; offset >>= 2;
182 *(((unsigned long *)(&t->reg_window[0]))+offset) = value;
183 goto success;
184 }
185 if(offset >= 784 && offset < 832) {
186 offset -= 784; offset >>= 2;
187 *(((unsigned long *)(&t->rwbuf_stkptrs[0]))+offset) = value;
188 goto success;
189 }
190 switch(offset) {
191 case 896:
192 cregs->u_regs[UREG_I0] = value;
193 break;
194 case 900:
195 cregs->u_regs[UREG_I1] = value;
196 break;
197 case 904:
198 cregs->u_regs[UREG_I2] = value;
199 break;
200 case 908:
201 cregs->u_regs[UREG_I3] = value;
202 break;
203 case 912:
204 cregs->u_regs[UREG_I4] = value;
205 break;
206 case 916:
207 cregs->u_regs[UREG_I5] = value;
208 break;
209 case 920:
210 cregs->u_regs[UREG_I6] = value;
211 break;
212 case 924:
213 cregs->u_regs[UREG_I7] = value;
214 break;
215 case 940:
216 cregs->u_regs[UREG_I0] = value;
217 break;
218 case 944:
219 cregs->u_regs[UREG_I1] = value;
220 break;
221
222 /* Rest of them are completely unsupported or "no-touch". */
223 default:
224 printk("%s [%d]: Wants to write user offset %ld\n",
225 current->comm, current->pid, offset);
226 goto failure;
227 }
228success:
229 pt_succ_return(regs, 0);
230 return;
231failure:
232 pt_error_return(regs, EIO);
233 return;
234}
235
236/* #define ALLOW_INIT_TRACING */
237/* #define DEBUG_PTRACE */
238
239#ifdef DEBUG_PTRACE
240char *pt_rq [] = {
241 /* 0 */ "TRACEME", "PEEKTEXT", "PEEKDATA", "PEEKUSR",
242 /* 4 */ "POKETEXT", "POKEDATA", "POKEUSR", "CONT",
243 /* 8 */ "KILL", "SINGLESTEP", "SUNATTACH", "SUNDETACH",
244 /* 12 */ "GETREGS", "SETREGS", "GETFPREGS", "SETFPREGS",
245 /* 16 */ "READDATA", "WRITEDATA", "READTEXT", "WRITETEXT",
246 /* 20 */ "GETFPAREGS", "SETFPAREGS", "unknown", "unknown",
247 /* 24 */ "SYSCALL", ""
248};
249#endif
250
251/*
252 * Called by kernel/ptrace.c when detaching..
253 *
254 * Make sure single step bits etc are not set.
255 */
256void ptrace_disable(struct task_struct *child)
257{
258 /* nothing to do */
259}
260
261asmlinkage void do_ptrace(struct pt_regs *regs)
262{
263 unsigned long request = regs->u_regs[UREG_I0];
264 unsigned long pid = regs->u_regs[UREG_I1];
265 unsigned long addr = regs->u_regs[UREG_I2];
266 unsigned long data = regs->u_regs[UREG_I3];
267 unsigned long addr2 = regs->u_regs[UREG_I4];
268 struct task_struct *child;
269 int ret;
270
271 lock_kernel();
272#ifdef DEBUG_PTRACE
273 {
274 char *s;
275
276 if ((request >= 0) && (request <= 24))
277 s = pt_rq [request];
278 else
279 s = "unknown";
280
281 if (request == PTRACE_POKEDATA && data == 0x91d02001){
282 printk ("do_ptrace: breakpoint pid=%d, addr=%08lx addr2=%08lx\n",
283 pid, addr, addr2);
284 } else
285 printk("do_ptrace: rq=%s(%d) pid=%d addr=%08lx data=%08lx addr2=%08lx\n",
286 s, (int) request, (int) pid, addr, data, addr2);
287 }
288#endif
289 if (request == PTRACE_TRACEME) {
290 int my_ret;
291
292 /* are we already being traced? */
293 if (current->ptrace & PT_PTRACED) {
294 pt_error_return(regs, EPERM);
295 goto out;
296 }
297 my_ret = security_ptrace(current->parent, current);
298 if (my_ret) {
299 pt_error_return(regs, -my_ret);
300 goto out;
301 }
302
303 /* set the ptrace bit in the process flags. */
304 current->ptrace |= PT_PTRACED;
305 pt_succ_return(regs, 0);
306 goto out;
307 }
308#ifndef ALLOW_INIT_TRACING
309 if (pid == 1) {
310 /* Can't dork with init. */
311 pt_error_return(regs, EPERM);
312 goto out;
313 }
314#endif
315 read_lock(&tasklist_lock);
316 child = find_task_by_pid(pid);
317 if (child)
318 get_task_struct(child);
319 read_unlock(&tasklist_lock);
320
321 if (!child) {
322 pt_error_return(regs, ESRCH);
323 goto out;
324 }
325
326 if ((current->personality == PER_SUNOS && request == PTRACE_SUNATTACH)
327 || (current->personality != PER_SUNOS && request == PTRACE_ATTACH)) {
328 if (ptrace_attach(child)) {
329 pt_error_return(regs, EPERM);
330 goto out_tsk;
331 }
332 pt_succ_return(regs, 0);
333 goto out_tsk;
334 }
335
336 ret = ptrace_check_attach(child, request == PTRACE_KILL);
337 if (ret < 0) {
338 pt_error_return(regs, -ret);
339 goto out_tsk;
340 }
341
342 switch(request) {
343 case PTRACE_PEEKTEXT: /* read word at location addr. */
344 case PTRACE_PEEKDATA: {
345 unsigned long tmp;
346
347 if (access_process_vm(child, addr,
348 &tmp, sizeof(tmp), 0) == sizeof(tmp))
349 pt_os_succ_return(regs, tmp, (long __user *)data);
350 else
351 pt_error_return(regs, EIO);
352 goto out_tsk;
353 }
354
355 case PTRACE_PEEKUSR:
356 read_sunos_user(regs, addr, child, (long __user *) data);
357 goto out_tsk;
358
359 case PTRACE_POKEUSR:
360 write_sunos_user(regs, addr, child);
361 goto out_tsk;
362
363 case PTRACE_POKETEXT: /* write the word at location addr. */
364 case PTRACE_POKEDATA: {
365 if (access_process_vm(child, addr,
366 &data, sizeof(data), 1) == sizeof(data))
367 pt_succ_return(regs, 0);
368 else
369 pt_error_return(regs, EIO);
370 goto out_tsk;
371 }
372
373 case PTRACE_GETREGS: {
374 struct pt_regs __user *pregs = (struct pt_regs __user *) addr;
375 struct pt_regs *cregs = child->thread.kregs;
376 int rval;
377
378 if (!access_ok(VERIFY_WRITE, pregs, sizeof(struct pt_regs))) {
379 rval = -EFAULT;
380 pt_error_return(regs, -rval);
381 goto out_tsk;
382 }
383 __put_user(cregs->psr, (&pregs->psr));
384 __put_user(cregs->pc, (&pregs->pc));
385 __put_user(cregs->npc, (&pregs->npc));
386 __put_user(cregs->y, (&pregs->y));
387 for(rval = 1; rval < 16; rval++)
388 __put_user(cregs->u_regs[rval], (&pregs->u_regs[rval - 1]));
389 pt_succ_return(regs, 0);
390#ifdef DEBUG_PTRACE
391 printk ("PC=%x nPC=%x o7=%x\n", cregs->pc, cregs->npc, cregs->u_regs [15]);
392#endif
393 goto out_tsk;
394 }
395
396 case PTRACE_SETREGS: {
397 struct pt_regs __user *pregs = (struct pt_regs __user *) addr;
398 struct pt_regs *cregs = child->thread.kregs;
399 unsigned long psr, pc, npc, y;
400 int i;
401
402 /* Must be careful, tracing process can only set certain
403 * bits in the psr.
404 */
405 if (!access_ok(VERIFY_READ, pregs, sizeof(struct pt_regs))) {
406 pt_error_return(regs, EFAULT);
407 goto out_tsk;
408 }
409 __get_user(psr, (&pregs->psr));
410 __get_user(pc, (&pregs->pc));
411 __get_user(npc, (&pregs->npc));
412 __get_user(y, (&pregs->y));
413 psr &= PSR_ICC;
414 cregs->psr &= ~PSR_ICC;
415 cregs->psr |= psr;
416 if (!((pc | npc) & 3)) {
417 cregs->pc = pc;
418 cregs->npc =npc;
419 }
420 cregs->y = y;
421 for(i = 1; i < 16; i++)
422 __get_user(cregs->u_regs[i], (&pregs->u_regs[i-1]));
423 pt_succ_return(regs, 0);
424 goto out_tsk;
425 }
426
427 case PTRACE_GETFPREGS: {
428 struct fps {
429 unsigned long regs[32];
430 unsigned long fsr;
431 unsigned long flags;
432 unsigned long extra;
433 unsigned long fpqd;
434 struct fq {
435 unsigned long *insnaddr;
436 unsigned long insn;
437 } fpq[16];
438 };
439 struct fps __user *fps = (struct fps __user *) addr;
440 int i;
441
442 if (!access_ok(VERIFY_WRITE, fps, sizeof(struct fps))) {
443 i = -EFAULT;
444 pt_error_return(regs, -i);
445 goto out_tsk;
446 }
447 for(i = 0; i < 32; i++)
448 __put_user(child->thread.float_regs[i], (&fps->regs[i]));
449 __put_user(child->thread.fsr, (&fps->fsr));
450 __put_user(child->thread.fpqdepth, (&fps->fpqd));
451 __put_user(0, (&fps->flags));
452 __put_user(0, (&fps->extra));
453 for(i = 0; i < 16; i++) {
454 __put_user(child->thread.fpqueue[i].insn_addr,
455 (&fps->fpq[i].insnaddr));
456 __put_user(child->thread.fpqueue[i].insn, (&fps->fpq[i].insn));
457 }
458 pt_succ_return(regs, 0);
459 goto out_tsk;
460 }
461
462 case PTRACE_SETFPREGS: {
463 struct fps {
464 unsigned long regs[32];
465 unsigned long fsr;
466 unsigned long flags;
467 unsigned long extra;
468 unsigned long fpqd;
469 struct fq {
470 unsigned long *insnaddr;
471 unsigned long insn;
472 } fpq[16];
473 };
474 struct fps __user *fps = (struct fps __user *) addr;
475 int i;
476
477 if (!access_ok(VERIFY_READ, fps, sizeof(struct fps))) {
478 i = -EFAULT;
479 pt_error_return(regs, -i);
480 goto out_tsk;
481 }
482 copy_from_user(&child->thread.float_regs[0], &fps->regs[0], (32 * sizeof(unsigned long)));
483 __get_user(child->thread.fsr, (&fps->fsr));
484 __get_user(child->thread.fpqdepth, (&fps->fpqd));
485 for(i = 0; i < 16; i++) {
486 __get_user(child->thread.fpqueue[i].insn_addr,
487 (&fps->fpq[i].insnaddr));
488 __get_user(child->thread.fpqueue[i].insn, (&fps->fpq[i].insn));
489 }
490 pt_succ_return(regs, 0);
491 goto out_tsk;
492 }
493
494 case PTRACE_READTEXT:
495 case PTRACE_READDATA: {
496 int res = ptrace_readdata(child, addr,
497 (void __user *) addr2, data);
498
499 if (res == data) {
500 pt_succ_return(regs, 0);
501 goto out_tsk;
502 }
503 /* Partial read is an IO failure */
504 if (res >= 0)
505 res = -EIO;
506 pt_error_return(regs, -res);
507 goto out_tsk;
508 }
509
510 case PTRACE_WRITETEXT:
511 case PTRACE_WRITEDATA: {
512 int res = ptrace_writedata(child, (void __user *) addr2,
513 addr, data);
514
515 if (res == data) {
516 pt_succ_return(regs, 0);
517 goto out_tsk;
518 }
519 /* Partial write is an IO failure */
520 if (res >= 0)
521 res = -EIO;
522 pt_error_return(regs, -res);
523 goto out_tsk;
524 }
525
526 case PTRACE_SYSCALL: /* continue and stop at (return from) syscall */
527 addr = 1;
528
529 case PTRACE_CONT: { /* restart after signal. */
7ed20e1a 530 if (!valid_signal(data)) {
1da177e4
LT		 531 pt_error_return(regs, EIO);
532 goto out_tsk;
533 }
1da177e4
LT		 534
535 if (request == PTRACE_SYSCALL)
536 set_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
537 else
538 clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
539
540 child->exit_code = data;
541#ifdef DEBUG_PTRACE
542 printk("CONT: %s [%d]: set exit_code = %x %lx %lx\n",
543 child->comm, child->pid, child->exit_code,
544 child->thread.kregs->pc,
545 child->thread.kregs->npc);
546#endif
547 wake_up_process(child);
548 pt_succ_return(regs, 0);
549 goto out_tsk;
550 }
551
552/*
553 * make the child exit. Best I can do is send it a sigkill.
554 * perhaps it should be put in the status that it wants to
555 * exit.
556 */
557 case PTRACE_KILL: {
558 if (child->exit_state == EXIT_ZOMBIE) { /* already dead */
559 pt_succ_return(regs, 0);
560 goto out_tsk;
561 }
562 wake_up_process(child);
563 child->exit_code = SIGKILL;
564 pt_succ_return(regs, 0);
565 goto out_tsk;
566 }
567
568 case PTRACE_SUNDETACH: { /* detach a process that was attached. */
569 int err = ptrace_detach(child, data);
570 if (err) {
571 pt_error_return(regs, EIO);
572 goto out_tsk;
573 }
574 pt_succ_return(regs, 0);
575 goto out_tsk;
576 }
577
578 /* PTRACE_DUMPCORE unsupported... */
579
580 default: {
581 int err = ptrace_request(child, request, addr, data);
582 if (err)
583 pt_error_return(regs, -err);
584 else
585 pt_succ_return(regs, 0);
586 goto out_tsk;
587 }
588 }
589out_tsk:
590 if (child)
591 put_task_struct(child);
592out:
593 unlock_kernel();
594}
595
596asmlinkage void syscall_trace(void)
597{
598#ifdef DEBUG_PTRACE
599 printk("%s [%d]: syscall_trace\n", current->comm, current->pid);
600#endif
601 if (!test_thread_flag(TIF_SYSCALL_TRACE))
602 return;
603 if (!(current->ptrace & PT_PTRACED))
604 return;
605 current->thread.flags ^= MAGIC_CONSTANT;
606 ptrace_notify(SIGTRAP | ((current->ptrace & PT_TRACESYSGOOD)
607 ? 0x80 : 0));
608 /*
609 * this isn't the same as continuing with a signal, but it will do
610 * for normal use. strace only continues with a signal if the
611 * stopping signal is not SIGTRAP. -brl
612 */
613#ifdef DEBUG_PTRACE
614 printk("%s [%d]: syscall_trace exit= %x\n", current->comm,
615 current->pid, current->exit_code);
616#endif
617 if (current->exit_code) {
618 send_sig (current->exit_code, current, 1);
619 current->exit_code = 0;
620 }
621}
Linux 6.x block layer and io_uring tree(s)