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review.evervolv.com / android_kernel_lge_hammerhead / 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 / . / arch / sparc64 / kernel / ptrace.c
blob: 1722dc51b0d8f5c1732eabaae7637d7b1adc2d76 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame^]1/* ptrace.c: Sparc process tracing support.
2 *
3 * Copyright (C) 1996 David S. Miller (davem@caipfs.rutgers.edu)
4 * Copyright (C) 1997 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
5 *
6 * Based upon code written by Ross Biro, Linus Torvalds, Bob Manson,
7 * and David Mosberger.
8 *
9 * Added Linux support -miguel (weird, eh?, the original code was meant
10 * to emulate SunOS).
11 */
12
13#include <linux/kernel.h>
14#include <linux/sched.h>
15#include <linux/mm.h>
16#include <linux/errno.h>
17#include <linux/ptrace.h>
18#include <linux/user.h>
19#include <linux/smp.h>
20#include <linux/smp_lock.h>
21#include <linux/security.h>
22
23#include <asm/asi.h>
24#include <asm/pgtable.h>
25#include <asm/system.h>
26#include <asm/uaccess.h>
27#include <asm/psrcompat.h>
28#include <asm/visasm.h>
29#include <asm/spitfire.h>
30
31/* Returning from ptrace is a bit tricky because the syscall return
32 * low level code assumes any value returned which is negative and
33 * is a valid errno will mean setting the condition codes to indicate
34 * an error return. This doesn't work, so we have this hook.
35 */
36static inline void pt_error_return(struct pt_regs *regs, unsigned long error)
37{
38 regs->u_regs[UREG_I0] = error;
39 regs->tstate |= (TSTATE_ICARRY | TSTATE_XCARRY);
40 regs->tpc = regs->tnpc;
41 regs->tnpc += 4;
42}
43
44static inline void pt_succ_return(struct pt_regs *regs, unsigned long value)
45{
46 regs->u_regs[UREG_I0] = value;
47 regs->tstate &= ~(TSTATE_ICARRY | TSTATE_XCARRY);
48 regs->tpc = regs->tnpc;
49 regs->tnpc += 4;
50}
51
52static inline void
53pt_succ_return_linux(struct pt_regs *regs, unsigned long value, void __user *addr)
54{
55 if (test_thread_flag(TIF_32BIT)) {
56 if (put_user(value, (unsigned int __user *) addr)) {
57 pt_error_return(regs, EFAULT);
58 return;
59 }
60 } else {
61 if (put_user(value, (long __user *) addr)) {
62 pt_error_return(regs, EFAULT);
63 return;
64 }
65 }
66 regs->u_regs[UREG_I0] = 0;
67 regs->tstate &= ~(TSTATE_ICARRY | TSTATE_XCARRY);
68 regs->tpc = regs->tnpc;
69 regs->tnpc += 4;
70}
71
72static void
73pt_os_succ_return (struct pt_regs *regs, unsigned long val, void __user *addr)
74{
75 if (current->personality == PER_SUNOS)
76 pt_succ_return (regs, val);
77 else
78 pt_succ_return_linux (regs, val, addr);
79}
80
81/* #define ALLOW_INIT_TRACING */
82/* #define DEBUG_PTRACE */
83
84#ifdef DEBUG_PTRACE
85char *pt_rq [] = {
86 /* 0 */ "TRACEME", "PEEKTEXT", "PEEKDATA", "PEEKUSR",
87 /* 4 */ "POKETEXT", "POKEDATA", "POKEUSR", "CONT",
88 /* 8 */ "KILL", "SINGLESTEP", "SUNATTACH", "SUNDETACH",
89 /* 12 */ "GETREGS", "SETREGS", "GETFPREGS", "SETFPREGS",
90 /* 16 */ "READDATA", "WRITEDATA", "READTEXT", "WRITETEXT",
91 /* 20 */ "GETFPAREGS", "SETFPAREGS", "unknown", "unknown",
92 /* 24 */ "SYSCALL", ""
93};
94#endif
95
96/*
97 * Called by kernel/ptrace.c when detaching..
98 *
99 * Make sure single step bits etc are not set.
100 */
101void ptrace_disable(struct task_struct *child)
102{
103 /* nothing to do */
104}
105
106asmlinkage void do_ptrace(struct pt_regs *regs)
107{
108 int request = regs->u_regs[UREG_I0];
109 pid_t pid = regs->u_regs[UREG_I1];
110 unsigned long addr = regs->u_regs[UREG_I2];
111 unsigned long data = regs->u_regs[UREG_I3];
112 unsigned long addr2 = regs->u_regs[UREG_I4];
113 struct task_struct *child;
114 int ret;
115
116 if (test_thread_flag(TIF_32BIT)) {
117 addr &= 0xffffffffUL;
118 data &= 0xffffffffUL;
119 addr2 &= 0xffffffffUL;
120 }
121 lock_kernel();
122#ifdef DEBUG_PTRACE
123 {
124 char *s;
125
126 if ((request >= 0) && (request <= 24))
127 s = pt_rq [request];
128 else
129 s = "unknown";
130
131 if (request == PTRACE_POKEDATA && data == 0x91d02001){
132 printk ("do_ptrace: breakpoint pid=%d, addr=%016lx addr2=%016lx\n",
133 pid, addr, addr2);
134 } else
135 printk("do_ptrace: rq=%s(%d) pid=%d addr=%016lx data=%016lx addr2=%016lx\n",
136 s, request, pid, addr, data, addr2);
137 }
138#endif
139 if (request == PTRACE_TRACEME) {
140 int ret;
141
142 /* are we already being traced? */
143 if (current->ptrace & PT_PTRACED) {
144 pt_error_return(regs, EPERM);
145 goto out;
146 }
147 ret = security_ptrace(current->parent, current);
148 if (ret) {
149 pt_error_return(regs, -ret);
150 goto out;
151 }
152
153 /* set the ptrace bit in the process flags. */
154 current->ptrace |= PT_PTRACED;
155 pt_succ_return(regs, 0);
156 goto out;
157 }
158#ifndef ALLOW_INIT_TRACING
159 if (pid == 1) {
160 /* Can't dork with init. */
161 pt_error_return(regs, EPERM);
162 goto out;
163 }
164#endif
165 read_lock(&tasklist_lock);
166 child = find_task_by_pid(pid);
167 if (child)
168 get_task_struct(child);
169 read_unlock(&tasklist_lock);
170
171 if (!child) {
172 pt_error_return(regs, ESRCH);
173 goto out;
174 }
175
176 if ((current->personality == PER_SUNOS && request == PTRACE_SUNATTACH)
177 || (current->personality != PER_SUNOS && request == PTRACE_ATTACH)) {
178 if (ptrace_attach(child)) {
179 pt_error_return(regs, EPERM);
180 goto out_tsk;
181 }
182 pt_succ_return(regs, 0);
183 goto out_tsk;
184 }
185
186 ret = ptrace_check_attach(child, request == PTRACE_KILL);
187 if (ret < 0) {
188 pt_error_return(regs, -ret);
189 goto out_tsk;
190 }
191
192 if (!(test_thread_flag(TIF_32BIT)) &&
193 ((request == PTRACE_READDATA64) ||
194 (request == PTRACE_WRITEDATA64) ||
195 (request == PTRACE_READTEXT64) ||
196 (request == PTRACE_WRITETEXT64) ||
197 (request == PTRACE_PEEKTEXT64) ||
198 (request == PTRACE_POKETEXT64) ||
199 (request == PTRACE_PEEKDATA64) ||
200 (request == PTRACE_POKEDATA64))) {
201 addr = regs->u_regs[UREG_G2];
202 addr2 = regs->u_regs[UREG_G3];
203 request -= 30; /* wheee... */
204 }
205
206 switch(request) {
207 case PTRACE_PEEKTEXT: /* read word at location addr. */
208 case PTRACE_PEEKDATA: {
209 unsigned long tmp64;
210 unsigned int tmp32;
211 int res, copied;
212
213 res = -EIO;
214 if (test_thread_flag(TIF_32BIT)) {
215 copied = access_process_vm(child, addr,
216 &tmp32, sizeof(tmp32), 0);
217 tmp64 = (unsigned long) tmp32;
218 if (copied == sizeof(tmp32))
219 res = 0;
220 } else {
221 copied = access_process_vm(child, addr,
222 &tmp64, sizeof(tmp64), 0);
223 if (copied == sizeof(tmp64))
224 res = 0;
225 }
226 if (res < 0)
227 pt_error_return(regs, -res);
228 else
229 pt_os_succ_return(regs, tmp64, (void __user *) data);
230 goto flush_and_out;
231 }
232
233 case PTRACE_POKETEXT: /* write the word at location addr. */
234 case PTRACE_POKEDATA: {
235 unsigned long tmp64;
236 unsigned int tmp32;
237 int copied, res = -EIO;
238
239 if (test_thread_flag(TIF_32BIT)) {
240 tmp32 = data;
241 copied = access_process_vm(child, addr,
242 &tmp32, sizeof(tmp32), 1);
243 if (copied == sizeof(tmp32))
244 res = 0;
245 } else {
246 tmp64 = data;
247 copied = access_process_vm(child, addr,
248 &tmp64, sizeof(tmp64), 1);
249 if (copied == sizeof(tmp64))
250 res = 0;
251 }
252 if (res < 0)
253 pt_error_return(regs, -res);
254 else
255 pt_succ_return(regs, res);
256 goto flush_and_out;
257 }
258
259 case PTRACE_GETREGS: {
260 struct pt_regs32 __user *pregs =
261 (struct pt_regs32 __user *) addr;
262 struct pt_regs *cregs = child->thread_info->kregs;
263 int rval;
264
265 if (__put_user(tstate_to_psr(cregs->tstate), (&pregs->psr)) ||
266 __put_user(cregs->tpc, (&pregs->pc)) ||
267 __put_user(cregs->tnpc, (&pregs->npc)) ||
268 __put_user(cregs->y, (&pregs->y))) {
269 pt_error_return(regs, EFAULT);
270 goto out_tsk;
271 }
272 for (rval = 1; rval < 16; rval++)
273 if (__put_user(cregs->u_regs[rval], (&pregs->u_regs[rval - 1]))) {
274 pt_error_return(regs, EFAULT);
275 goto out_tsk;
276 }
277 pt_succ_return(regs, 0);
278#ifdef DEBUG_PTRACE
279 printk ("PC=%lx nPC=%lx o7=%lx\n", cregs->tpc, cregs->tnpc, cregs->u_regs [15]);
280#endif
281 goto out_tsk;
282 }
283
284 case PTRACE_GETREGS64: {
285 struct pt_regs __user *pregs = (struct pt_regs __user *) addr;
286 struct pt_regs *cregs = child->thread_info->kregs;
287 unsigned long tpc = cregs->tpc;
288 int rval;
289
290 if ((child->thread_info->flags & _TIF_32BIT) != 0)
291 tpc &= 0xffffffff;
292 if (__put_user(cregs->tstate, (&pregs->tstate)) ||
293 __put_user(tpc, (&pregs->tpc)) ||
294 __put_user(cregs->tnpc, (&pregs->tnpc)) ||
295 __put_user(cregs->y, (&pregs->y))) {
296 pt_error_return(regs, EFAULT);
297 goto out_tsk;
298 }
299 for (rval = 1; rval < 16; rval++)
300 if (__put_user(cregs->u_regs[rval], (&pregs->u_regs[rval - 1]))) {
301 pt_error_return(regs, EFAULT);
302 goto out_tsk;
303 }
304 pt_succ_return(regs, 0);
305#ifdef DEBUG_PTRACE
306 printk ("PC=%lx nPC=%lx o7=%lx\n", cregs->tpc, cregs->tnpc, cregs->u_regs [15]);
307#endif
308 goto out_tsk;
309 }
310
311 case PTRACE_SETREGS: {
312 struct pt_regs32 __user *pregs =
313 (struct pt_regs32 __user *) addr;
314 struct pt_regs *cregs = child->thread_info->kregs;
315 unsigned int psr, pc, npc, y;
316 int i;
317
318 /* Must be careful, tracing process can only set certain
319 * bits in the psr.
320 */
321 if (__get_user(psr, (&pregs->psr)) ||
322 __get_user(pc, (&pregs->pc)) ||
323 __get_user(npc, (&pregs->npc)) ||
324 __get_user(y, (&pregs->y))) {
325 pt_error_return(regs, EFAULT);
326 goto out_tsk;
327 }
328 cregs->tstate &= ~(TSTATE_ICC);
329 cregs->tstate |= psr_to_tstate_icc(psr);
330 if (!((pc | npc) & 3)) {
331 cregs->tpc = pc;
332 cregs->tnpc = npc;
333 }
334 cregs->y = y;
335 for (i = 1; i < 16; i++) {
336 if (__get_user(cregs->u_regs[i], (&pregs->u_regs[i-1]))) {
337 pt_error_return(regs, EFAULT);
338 goto out_tsk;
339 }
340 }
341 pt_succ_return(regs, 0);
342 goto out_tsk;
343 }
344
345 case PTRACE_SETREGS64: {
346 struct pt_regs __user *pregs = (struct pt_regs __user *) addr;
347 struct pt_regs *cregs = child->thread_info->kregs;
348 unsigned long tstate, tpc, tnpc, y;
349 int i;
350
351 /* Must be careful, tracing process can only set certain
352 * bits in the psr.
353 */
354 if (__get_user(tstate, (&pregs->tstate)) ||
355 __get_user(tpc, (&pregs->tpc)) ||
356 __get_user(tnpc, (&pregs->tnpc)) ||
357 __get_user(y, (&pregs->y))) {
358 pt_error_return(regs, EFAULT);
359 goto out_tsk;
360 }
361 if ((child->thread_info->flags & _TIF_32BIT) != 0) {
362 tpc &= 0xffffffff;
363 tnpc &= 0xffffffff;
364 }
365 tstate &= (TSTATE_ICC | TSTATE_XCC);
366 cregs->tstate &= ~(TSTATE_ICC | TSTATE_XCC);
367 cregs->tstate |= tstate;
368 if (!((tpc | tnpc) & 3)) {
369 cregs->tpc = tpc;
370 cregs->tnpc = tnpc;
371 }
372 cregs->y = y;
373 for (i = 1; i < 16; i++) {
374 if (__get_user(cregs->u_regs[i], (&pregs->u_regs[i-1]))) {
375 pt_error_return(regs, EFAULT);
376 goto out_tsk;
377 }
378 }
379 pt_succ_return(regs, 0);
380 goto out_tsk;
381 }
382
383 case PTRACE_GETFPREGS: {
384 struct fps {
385 unsigned int regs[32];
386 unsigned int fsr;
387 unsigned int flags;
388 unsigned int extra;
389 unsigned int fpqd;
390 struct fq {
391 unsigned int insnaddr;
392 unsigned int insn;
393 } fpq[16];
394 };
395 struct fps __user *fps = (struct fps __user *) addr;
396 unsigned long *fpregs = child->thread_info->fpregs;
397
398 if (copy_to_user(&fps->regs[0], fpregs,
399 (32 * sizeof(unsigned int))) ||
400 __put_user(child->thread_info->xfsr[0], (&fps->fsr)) ||
401 __put_user(0, (&fps->fpqd)) ||
402 __put_user(0, (&fps->flags)) ||
403 __put_user(0, (&fps->extra)) ||
404 clear_user(&fps->fpq[0], 32 * sizeof(unsigned int))) {
405 pt_error_return(regs, EFAULT);
406 goto out_tsk;
407 }
408 pt_succ_return(regs, 0);
409 goto out_tsk;
410 }
411
412 case PTRACE_GETFPREGS64: {
413 struct fps {
414 unsigned int regs[64];
415 unsigned long fsr;
416 };
417 struct fps __user *fps = (struct fps __user *) addr;
418 unsigned long *fpregs = child->thread_info->fpregs;
419
420 if (copy_to_user(&fps->regs[0], fpregs,
421 (64 * sizeof(unsigned int))) ||
422 __put_user(child->thread_info->xfsr[0], (&fps->fsr))) {
423 pt_error_return(regs, EFAULT);
424 goto out_tsk;
425 }
426 pt_succ_return(regs, 0);
427 goto out_tsk;
428 }
429
430 case PTRACE_SETFPREGS: {
431 struct fps {
432 unsigned int regs[32];
433 unsigned int fsr;
434 unsigned int flags;
435 unsigned int extra;
436 unsigned int fpqd;
437 struct fq {
438 unsigned int insnaddr;
439 unsigned int insn;
440 } fpq[16];
441 };
442 struct fps __user *fps = (struct fps __user *) addr;
443 unsigned long *fpregs = child->thread_info->fpregs;
444 unsigned fsr;
445
446 if (copy_from_user(fpregs, &fps->regs[0],
447 (32 * sizeof(unsigned int))) ||
448 __get_user(fsr, (&fps->fsr))) {
449 pt_error_return(regs, EFAULT);
450 goto out_tsk;
451 }
452 child->thread_info->xfsr[0] &= 0xffffffff00000000UL;
453 child->thread_info->xfsr[0] |= fsr;
454 if (!(child->thread_info->fpsaved[0] & FPRS_FEF))
455 child->thread_info->gsr[0] = 0;
456 child->thread_info->fpsaved[0] |= (FPRS_FEF | FPRS_DL);
457 pt_succ_return(regs, 0);
458 goto out_tsk;
459 }
460
461 case PTRACE_SETFPREGS64: {
462 struct fps {
463 unsigned int regs[64];
464 unsigned long fsr;
465 };
466 struct fps __user *fps = (struct fps __user *) addr;
467 unsigned long *fpregs = child->thread_info->fpregs;
468
469 if (copy_from_user(fpregs, &fps->regs[0],
470 (64 * sizeof(unsigned int))) ||
471 __get_user(child->thread_info->xfsr[0], (&fps->fsr))) {
472 pt_error_return(regs, EFAULT);
473 goto out_tsk;
474 }
475 if (!(child->thread_info->fpsaved[0] & FPRS_FEF))
476 child->thread_info->gsr[0] = 0;
477 child->thread_info->fpsaved[0] |= (FPRS_FEF | FPRS_DL | FPRS_DU);
478 pt_succ_return(regs, 0);
479 goto out_tsk;
480 }
481
482 case PTRACE_READTEXT:
483 case PTRACE_READDATA: {
484 int res = ptrace_readdata(child, addr,
485 (char __user *)addr2, data);
486 if (res == data) {
487 pt_succ_return(regs, 0);
488 goto flush_and_out;
489 }
490 if (res >= 0)
491 res = -EIO;
492 pt_error_return(regs, -res);
493 goto flush_and_out;
494 }
495
496 case PTRACE_WRITETEXT:
497 case PTRACE_WRITEDATA: {
498 int res = ptrace_writedata(child, (char __user *) addr2,
499 addr, data);
500 if (res == data) {
501 pt_succ_return(regs, 0);
502 goto flush_and_out;
503 }
504 if (res >= 0)
505 res = -EIO;
506 pt_error_return(regs, -res);
507 goto flush_and_out;
508 }
509 case PTRACE_SYSCALL: /* continue and stop at (return from) syscall */
510 addr = 1;
511
512 case PTRACE_CONT: { /* restart after signal. */
513 if (data > _NSIG) {
514 pt_error_return(regs, EIO);
515 goto out_tsk;
516 }
517 if (addr != 1) {
518 unsigned long pc_mask = ~0UL;
519
520 if ((child->thread_info->flags & _TIF_32BIT) != 0)
521 pc_mask = 0xffffffff;
522
523 if (addr & 3) {
524 pt_error_return(regs, EINVAL);
525 goto out_tsk;
526 }
527#ifdef DEBUG_PTRACE
528 printk ("Original: %016lx %016lx\n",
529 child->thread_info->kregs->tpc,
530 child->thread_info->kregs->tnpc);
531 printk ("Continuing with %016lx %016lx\n", addr, addr+4);
532#endif
533 child->thread_info->kregs->tpc = (addr & pc_mask);
534 child->thread_info->kregs->tnpc = ((addr + 4) & pc_mask);
535 }
536
537 if (request == PTRACE_SYSCALL) {
538 set_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
539 } else {
540 clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
541 }
542
543 child->exit_code = data;
544#ifdef DEBUG_PTRACE
545 printk("CONT: %s [%d]: set exit_code = %x %lx %lx\n", child->comm,
546 child->pid, child->exit_code,
547 child->thread_info->kregs->tpc,
548 child->thread_info->kregs->tnpc);
549
550#endif
551 wake_up_process(child);
552 pt_succ_return(regs, 0);
553 goto out_tsk;
554 }
555
556/*
557 * make the child exit. Best I can do is send it a sigkill.
558 * perhaps it should be put in the status that it wants to
559 * exit.
560 */
561 case PTRACE_KILL: {
562 if (child->exit_state == EXIT_ZOMBIE) { /* already dead */
563 pt_succ_return(regs, 0);
564 goto out_tsk;
565 }
566 child->exit_code = SIGKILL;
567 wake_up_process(child);
568 pt_succ_return(regs, 0);
569 goto out_tsk;
570 }
571
572 case PTRACE_SUNDETACH: { /* detach a process that was attached. */
573 int error = ptrace_detach(child, data);
574 if (error) {
575 pt_error_return(regs, EIO);
576 goto out_tsk;
577 }
578 pt_succ_return(regs, 0);
579 goto out_tsk;
580 }
581
582 /* PTRACE_DUMPCORE unsupported... */
583
584 default: {
585 int err = ptrace_request(child, request, addr, data);
586 if (err)
587 pt_error_return(regs, -err);
588 else
589 pt_succ_return(regs, 0);
590 goto out_tsk;
591 }
592 }
593flush_and_out:
594 {
595 unsigned long va;
596
597 if (tlb_type == cheetah || tlb_type == cheetah_plus) {
598 for (va = 0; va < (1 << 16); va += (1 << 5))
599 spitfire_put_dcache_tag(va, 0x0);
600 /* No need to mess with I-cache on Cheetah. */
601 } else {
602 for (va = 0; va < L1DCACHE_SIZE; va += 32)
603 spitfire_put_dcache_tag(va, 0x0);
604 if (request == PTRACE_PEEKTEXT ||
605 request == PTRACE_POKETEXT ||
606 request == PTRACE_READTEXT ||
607 request == PTRACE_WRITETEXT) {
608 for (va = 0; va < (PAGE_SIZE << 1); va += 32)
609 spitfire_put_icache_tag(va, 0x0);
610 __asm__ __volatile__("flush %g6");
611 }
612 }
613 }
614out_tsk:
615 if (child)
616 put_task_struct(child);
617out:
618 unlock_kernel();
619}
620
621asmlinkage void syscall_trace(void)
622{
623#ifdef DEBUG_PTRACE
624 printk("%s [%d]: syscall_trace\n", current->comm, current->pid);
625#endif
626 if (!test_thread_flag(TIF_SYSCALL_TRACE))
627 return;
628 if (!(current->ptrace & PT_PTRACED))
629 return;
630 ptrace_notify(SIGTRAP | ((current->ptrace & PT_TRACESYSGOOD)
631 ? 0x80 : 0));
632
633 /*
634 * this isn't the same as continuing with a signal, but it will do
635 * for normal use. strace only continues with a signal if the
636 * stopping signal is not SIGTRAP. -brl
637 */
638#ifdef DEBUG_PTRACE
639 printk("%s [%d]: syscall_trace exit= %x\n", current->comm,
640 current->pid, current->exit_code);
641#endif
642 if (current->exit_code) {
643 send_sig (current->exit_code, current, 1);
644 current->exit_code = 0;
645 }
646}