1 /* ptrace.c: Sparc process tracing support.
3 * Copyright (C) 1996 David S. Miller (davem@caipfs.rutgers.edu)
4 * Copyright (C) 1997 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
6 * Based upon code written by Ross Biro, Linus Torvalds, Bob Manson,
9 * Added Linux support -miguel (weird, eh?, the original code was meant
13 #include <linux/kernel.h>
14 #include <linux/sched.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>
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>
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.
36 static inline void pt_error_return(struct pt_regs *regs, unsigned long error)
38 regs->u_regs[UREG_I0] = error;
39 regs->tstate |= (TSTATE_ICARRY | TSTATE_XCARRY);
40 regs->tpc = regs->tnpc;
44 static inline void pt_succ_return(struct pt_regs *regs, unsigned long value)
46 regs->u_regs[UREG_I0] = value;
47 regs->tstate &= ~(TSTATE_ICARRY | TSTATE_XCARRY);
48 regs->tpc = regs->tnpc;
53 pt_succ_return_linux(struct pt_regs *regs, unsigned long value, long *addr)
55 if (test_thread_flag(TIF_32BIT)) {
56 if (put_user(value, (unsigned int __user *) addr)) {
57 pt_error_return(regs, EFAULT);
61 if (put_user(value, (long __user *) addr)) {
62 pt_error_return(regs, EFAULT);
66 regs->u_regs[UREG_I0] = 0;
67 regs->tstate &= ~(TSTATE_ICARRY | TSTATE_XCARRY);
68 regs->tpc = regs->tnpc;
73 pt_os_succ_return (struct pt_regs *regs, unsigned long val, long *addr)
75 if (current->personality == PER_SUNOS)
76 pt_succ_return (regs, val);
78 pt_succ_return_linux (regs, val, addr);
81 /* #define ALLOW_INIT_TRACING */
82 /* #define DEBUG_PTRACE */
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", ""
97 * Called by kernel/ptrace.c when detaching..
99 * Make sure single step bits etc are not set.
101 void ptrace_disable(struct task_struct *child)
106 asmlinkage void do_ptrace(struct pt_regs *regs)
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;
116 if (test_thread_flag(TIF_32BIT)) {
117 addr &= 0xffffffffUL;
118 data &= 0xffffffffUL;
119 addr2 &= 0xffffffffUL;
126 if ((request >= 0) && (request <= 24))
131 if (request == PTRACE_POKEDATA && data == 0x91d02001){
132 printk ("do_ptrace: breakpoint pid=%d, addr=%016lx addr2=%016lx\n",
135 printk("do_ptrace: rq=%s(%d) pid=%d addr=%016lx data=%016lx addr2=%016lx\n",
136 s, request, pid, addr, data, addr2);
139 if (request == PTRACE_TRACEME) {
142 /* are we already being traced? */
143 if (current->ptrace & PT_PTRACED) {
144 pt_error_return(regs, EPERM);
147 ret = security_ptrace(current->parent, current);
149 pt_error_return(regs, -ret);
153 /* set the ptrace bit in the process flags. */
154 current->ptrace |= PT_PTRACED;
155 pt_succ_return(regs, 0);
158 #ifndef ALLOW_INIT_TRACING
160 /* Can't dork with init. */
161 pt_error_return(regs, EPERM);
165 read_lock(&tasklist_lock);
166 child = find_task_by_pid(pid);
168 get_task_struct(child);
169 read_unlock(&tasklist_lock);
172 pt_error_return(regs, ESRCH);
175 if (!vx_check(vx_task_xid(child), VX_WATCH|VX_IDENT)) {
176 pt_error_return(regs, ESRCH);
180 if ((current->personality == PER_SUNOS && request == PTRACE_SUNATTACH)
181 || (current->personality != PER_SUNOS && request == PTRACE_ATTACH)) {
182 if (ptrace_attach(child)) {
183 pt_error_return(regs, EPERM);
186 pt_succ_return(regs, 0);
190 ret = ptrace_check_attach(child, request == PTRACE_KILL);
192 pt_error_return(regs, -ret);
196 if (!(test_thread_flag(TIF_32BIT)) &&
197 ((request == PTRACE_READDATA64) ||
198 (request == PTRACE_WRITEDATA64) ||
199 (request == PTRACE_READTEXT64) ||
200 (request == PTRACE_WRITETEXT64) ||
201 (request == PTRACE_PEEKTEXT64) ||
202 (request == PTRACE_POKETEXT64) ||
203 (request == PTRACE_PEEKDATA64) ||
204 (request == PTRACE_POKEDATA64))) {
205 addr = regs->u_regs[UREG_G2];
206 addr2 = regs->u_regs[UREG_G3];
207 request -= 30; /* wheee... */
211 case PTRACE_PEEKTEXT: /* read word at location addr. */
212 case PTRACE_PEEKDATA: {
218 if (test_thread_flag(TIF_32BIT)) {
219 copied = access_process_vm(child, addr,
220 &tmp32, sizeof(tmp32), 0);
221 tmp64 = (unsigned long) tmp32;
222 if (copied == sizeof(tmp32))
225 copied = access_process_vm(child, addr,
226 &tmp64, sizeof(tmp64), 0);
227 if (copied == sizeof(tmp64))
231 pt_error_return(regs, -res);
233 pt_os_succ_return(regs, tmp64, (long *) data);
237 case PTRACE_POKETEXT: /* write the word at location addr. */
238 case PTRACE_POKEDATA: {
241 int copied, res = -EIO;
243 if (test_thread_flag(TIF_32BIT)) {
245 copied = access_process_vm(child, addr,
246 &tmp32, sizeof(tmp32), 1);
247 if (copied == sizeof(tmp32))
251 copied = access_process_vm(child, addr,
252 &tmp64, sizeof(tmp64), 1);
253 if (copied == sizeof(tmp64))
257 pt_error_return(regs, -res);
259 pt_succ_return(regs, res);
263 case PTRACE_GETREGS: {
264 struct pt_regs32 __user *pregs =
265 (struct pt_regs32 __user *) addr;
266 struct pt_regs *cregs = child->thread_info->kregs;
269 if (__put_user(tstate_to_psr(cregs->tstate), (&pregs->psr)) ||
270 __put_user(cregs->tpc, (&pregs->pc)) ||
271 __put_user(cregs->tnpc, (&pregs->npc)) ||
272 __put_user(cregs->y, (&pregs->y))) {
273 pt_error_return(regs, EFAULT);
276 for (rval = 1; rval < 16; rval++)
277 if (__put_user(cregs->u_regs[rval], (&pregs->u_regs[rval - 1]))) {
278 pt_error_return(regs, EFAULT);
281 pt_succ_return(regs, 0);
283 printk ("PC=%lx nPC=%lx o7=%lx\n", cregs->tpc, cregs->tnpc, cregs->u_regs [15]);
288 case PTRACE_GETREGS64: {
289 struct pt_regs __user *pregs = (struct pt_regs __user *) addr;
290 struct pt_regs *cregs = child->thread_info->kregs;
291 unsigned long tpc = cregs->tpc;
294 if ((child->thread_info->flags & _TIF_32BIT) != 0)
296 if (__put_user(cregs->tstate, (&pregs->tstate)) ||
297 __put_user(tpc, (&pregs->tpc)) ||
298 __put_user(cregs->tnpc, (&pregs->tnpc)) ||
299 __put_user(cregs->y, (&pregs->y))) {
300 pt_error_return(regs, EFAULT);
303 for (rval = 1; rval < 16; rval++)
304 if (__put_user(cregs->u_regs[rval], (&pregs->u_regs[rval - 1]))) {
305 pt_error_return(regs, EFAULT);
308 pt_succ_return(regs, 0);
310 printk ("PC=%lx nPC=%lx o7=%lx\n", cregs->tpc, cregs->tnpc, cregs->u_regs [15]);
315 case PTRACE_SETREGS: {
316 struct pt_regs32 __user *pregs =
317 (struct pt_regs32 __user *) addr;
318 struct pt_regs *cregs = child->thread_info->kregs;
319 unsigned int psr, pc, npc, y;
322 /* Must be careful, tracing process can only set certain
325 if (__get_user(psr, (&pregs->psr)) ||
326 __get_user(pc, (&pregs->pc)) ||
327 __get_user(npc, (&pregs->npc)) ||
328 __get_user(y, (&pregs->y))) {
329 pt_error_return(regs, EFAULT);
332 cregs->tstate &= ~(TSTATE_ICC);
333 cregs->tstate |= psr_to_tstate_icc(psr);
334 if (!((pc | npc) & 3)) {
339 for (i = 1; i < 16; i++) {
340 if (__get_user(cregs->u_regs[i], (&pregs->u_regs[i-1]))) {
341 pt_error_return(regs, EFAULT);
345 pt_succ_return(regs, 0);
349 case PTRACE_SETREGS64: {
350 struct pt_regs __user *pregs = (struct pt_regs __user *) addr;
351 struct pt_regs *cregs = child->thread_info->kregs;
352 unsigned long tstate, tpc, tnpc, y;
355 /* Must be careful, tracing process can only set certain
358 if (__get_user(tstate, (&pregs->tstate)) ||
359 __get_user(tpc, (&pregs->tpc)) ||
360 __get_user(tnpc, (&pregs->tnpc)) ||
361 __get_user(y, (&pregs->y))) {
362 pt_error_return(regs, EFAULT);
365 if ((child->thread_info->flags & _TIF_32BIT) != 0) {
369 tstate &= (TSTATE_ICC | TSTATE_XCC);
370 cregs->tstate &= ~(TSTATE_ICC | TSTATE_XCC);
371 cregs->tstate |= tstate;
372 if (!((tpc | tnpc) & 3)) {
377 for (i = 1; i < 16; i++) {
378 if (__get_user(cregs->u_regs[i], (&pregs->u_regs[i-1]))) {
379 pt_error_return(regs, EFAULT);
383 pt_succ_return(regs, 0);
387 case PTRACE_GETFPREGS: {
389 unsigned int regs[32];
395 unsigned int insnaddr;
399 struct fps __user *fps = (struct fps __user *) addr;
400 unsigned long *fpregs = child->thread_info->fpregs;
402 if (copy_to_user(&fps->regs[0], fpregs,
403 (32 * sizeof(unsigned int))) ||
404 __put_user(child->thread_info->xfsr[0], (&fps->fsr)) ||
405 __put_user(0, (&fps->fpqd)) ||
406 __put_user(0, (&fps->flags)) ||
407 __put_user(0, (&fps->extra)) ||
408 clear_user(&fps->fpq[0], 32 * sizeof(unsigned int))) {
409 pt_error_return(regs, EFAULT);
412 pt_succ_return(regs, 0);
416 case PTRACE_GETFPREGS64: {
418 unsigned int regs[64];
421 struct fps __user *fps = (struct fps __user *) addr;
422 unsigned long *fpregs = child->thread_info->fpregs;
424 if (copy_to_user(&fps->regs[0], fpregs,
425 (64 * sizeof(unsigned int))) ||
426 __put_user(child->thread_info->xfsr[0], (&fps->fsr))) {
427 pt_error_return(regs, EFAULT);
430 pt_succ_return(regs, 0);
434 case PTRACE_SETFPREGS: {
436 unsigned int regs[32];
442 unsigned int insnaddr;
446 struct fps __user *fps = (struct fps __user *) addr;
447 unsigned long *fpregs = child->thread_info->fpregs;
450 if (copy_from_user(fpregs, &fps->regs[0],
451 (32 * sizeof(unsigned int))) ||
452 __get_user(fsr, (&fps->fsr))) {
453 pt_error_return(regs, EFAULT);
456 child->thread_info->xfsr[0] &= 0xffffffff00000000UL;
457 child->thread_info->xfsr[0] |= fsr;
458 if (!(child->thread_info->fpsaved[0] & FPRS_FEF))
459 child->thread_info->gsr[0] = 0;
460 child->thread_info->fpsaved[0] |= (FPRS_FEF | FPRS_DL);
461 pt_succ_return(regs, 0);
465 case PTRACE_SETFPREGS64: {
467 unsigned int regs[64];
470 struct fps __user *fps = (struct fps __user *) addr;
471 unsigned long *fpregs = child->thread_info->fpregs;
473 if (copy_from_user(fpregs, &fps->regs[0],
474 (64 * sizeof(unsigned int))) ||
475 __get_user(child->thread_info->xfsr[0], (&fps->fsr))) {
476 pt_error_return(regs, EFAULT);
479 if (!(child->thread_info->fpsaved[0] & FPRS_FEF))
480 child->thread_info->gsr[0] = 0;
481 child->thread_info->fpsaved[0] |= (FPRS_FEF | FPRS_DL | FPRS_DU);
482 pt_succ_return(regs, 0);
486 case PTRACE_READTEXT:
487 case PTRACE_READDATA: {
488 int res = ptrace_readdata(child, addr,
489 (char __user *)addr2, data);
491 pt_succ_return(regs, 0);
496 pt_error_return(regs, -res);
500 case PTRACE_WRITETEXT:
501 case PTRACE_WRITEDATA: {
502 int res = ptrace_writedata(child, (char __user *) addr2,
505 pt_succ_return(regs, 0);
510 pt_error_return(regs, -res);
513 case PTRACE_SYSCALL: /* continue and stop at (return from) syscall */
516 case PTRACE_CONT: { /* restart after signal. */
518 pt_error_return(regs, EIO);
522 unsigned long pc_mask = ~0UL;
524 if ((child->thread_info->flags & _TIF_32BIT) != 0)
525 pc_mask = 0xffffffff;
528 pt_error_return(regs, EINVAL);
532 printk ("Original: %016lx %016lx\n",
533 child->thread_info->kregs->tpc,
534 child->thread_info->kregs->tnpc);
535 printk ("Continuing with %016lx %016lx\n", addr, addr+4);
537 child->thread_info->kregs->tpc = (addr & pc_mask);
538 child->thread_info->kregs->tnpc = ((addr + 4) & pc_mask);
541 if (request == PTRACE_SYSCALL) {
542 set_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
544 clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
547 child->exit_code = data;
549 printk("CONT: %s [%d]: set exit_code = %x %lx %lx\n", child->comm,
550 child->pid, child->exit_code,
551 child->thread_info->kregs->tpc,
552 child->thread_info->kregs->tnpc);
555 wake_up_process(child);
556 pt_succ_return(regs, 0);
561 * make the child exit. Best I can do is send it a sigkill.
562 * perhaps it should be put in the status that it wants to
566 if (child->exit_state == EXIT_ZOMBIE) { /* already dead */
567 pt_succ_return(regs, 0);
570 child->exit_code = SIGKILL;
571 wake_up_process(child);
572 pt_succ_return(regs, 0);
576 case PTRACE_SUNDETACH: { /* detach a process that was attached. */
577 int error = ptrace_detach(child, data);
579 pt_error_return(regs, EIO);
582 pt_succ_return(regs, 0);
586 /* PTRACE_DUMPCORE unsupported... */
589 int err = ptrace_request(child, request, addr, data);
591 pt_error_return(regs, -err);
593 pt_succ_return(regs, 0);
601 if (tlb_type == cheetah || tlb_type == cheetah_plus) {
602 for (va = 0; va < (1 << 16); va += (1 << 5))
603 spitfire_put_dcache_tag(va, 0x0);
604 /* No need to mess with I-cache on Cheetah. */
606 for (va = 0; va < L1DCACHE_SIZE; va += 32)
607 spitfire_put_dcache_tag(va, 0x0);
608 if (request == PTRACE_PEEKTEXT ||
609 request == PTRACE_POKETEXT ||
610 request == PTRACE_READTEXT ||
611 request == PTRACE_WRITETEXT) {
612 for (va = 0; va < (PAGE_SIZE << 1); va += 32)
613 spitfire_put_icache_tag(va, 0x0);
614 __asm__ __volatile__("flush %g6");
620 put_task_struct(child);
625 asmlinkage void syscall_trace(void)
628 printk("%s [%d]: syscall_trace\n", current->comm, current->pid);
630 if (!test_thread_flag(TIF_SYSCALL_TRACE))
632 if (!(current->ptrace & PT_PTRACED))
634 ptrace_notify(SIGTRAP | ((current->ptrace & PT_TRACESYSGOOD)
638 * this isn't the same as continuing with a signal, but it will do
639 * for normal use. strace only continues with a signal if the
640 * stopping signal is not SIGTRAP. -brl
643 printk("%s [%d]: syscall_trace exit= %x\n", current->comm,
644 current->pid, current->exit_code);
646 if (current->exit_code) {
647 send_sig (current->exit_code, current, 1);
648 current->exit_code = 0;