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, void __user *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, void __user *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);
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);
182 pt_succ_return(regs, 0);
186 ret = ptrace_check_attach(child, request == PTRACE_KILL);
188 pt_error_return(regs, -ret);
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... */
207 case PTRACE_PEEKTEXT: /* read word at location addr. */
208 case PTRACE_PEEKDATA: {
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))
221 copied = access_process_vm(child, addr,
222 &tmp64, sizeof(tmp64), 0);
223 if (copied == sizeof(tmp64))
227 pt_error_return(regs, -res);
229 pt_os_succ_return(regs, tmp64, (void __user *) data);
233 case PTRACE_POKETEXT: /* write the word at location addr. */
234 case PTRACE_POKEDATA: {
237 int copied, res = -EIO;
239 if (test_thread_flag(TIF_32BIT)) {
241 copied = access_process_vm(child, addr,
242 &tmp32, sizeof(tmp32), 1);
243 if (copied == sizeof(tmp32))
247 copied = access_process_vm(child, addr,
248 &tmp64, sizeof(tmp64), 1);
249 if (copied == sizeof(tmp64))
253 pt_error_return(regs, -res);
255 pt_succ_return(regs, res);
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;
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);
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);
277 pt_succ_return(regs, 0);
279 printk ("PC=%lx nPC=%lx o7=%lx\n", cregs->tpc, cregs->tnpc, cregs->u_regs [15]);
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;
290 if ((child->thread_info->flags & _TIF_32BIT) != 0)
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);
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);
304 pt_succ_return(regs, 0);
306 printk ("PC=%lx nPC=%lx o7=%lx\n", cregs->tpc, cregs->tnpc, cregs->u_regs [15]);
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;
318 /* Must be careful, tracing process can only set certain
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);
328 cregs->tstate &= ~(TSTATE_ICC);
329 cregs->tstate |= psr_to_tstate_icc(psr);
330 if (!((pc | npc) & 3)) {
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);
341 pt_succ_return(regs, 0);
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;
351 /* Must be careful, tracing process can only set certain
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);
361 if ((child->thread_info->flags & _TIF_32BIT) != 0) {
365 tstate &= (TSTATE_ICC | TSTATE_XCC);
366 cregs->tstate &= ~(TSTATE_ICC | TSTATE_XCC);
367 cregs->tstate |= tstate;
368 if (!((tpc | tnpc) & 3)) {
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);
379 pt_succ_return(regs, 0);
383 case PTRACE_GETFPREGS: {
385 unsigned int regs[32];
391 unsigned int insnaddr;
395 struct fps __user *fps = (struct fps __user *) addr;
396 unsigned long *fpregs = child->thread_info->fpregs;
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);
408 pt_succ_return(regs, 0);
412 case PTRACE_GETFPREGS64: {
414 unsigned int regs[64];
417 struct fps __user *fps = (struct fps __user *) addr;
418 unsigned long *fpregs = child->thread_info->fpregs;
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);
426 pt_succ_return(regs, 0);
430 case PTRACE_SETFPREGS: {
432 unsigned int regs[32];
438 unsigned int insnaddr;
442 struct fps __user *fps = (struct fps __user *) addr;
443 unsigned long *fpregs = child->thread_info->fpregs;
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);
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);
461 case PTRACE_SETFPREGS64: {
463 unsigned int regs[64];
466 struct fps __user *fps = (struct fps __user *) addr;
467 unsigned long *fpregs = child->thread_info->fpregs;
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);
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);
482 case PTRACE_READTEXT:
483 case PTRACE_READDATA: {
484 int res = ptrace_readdata(child, addr,
485 (char __user *)addr2, data);
487 pt_succ_return(regs, 0);
492 pt_error_return(regs, -res);
496 case PTRACE_WRITETEXT:
497 case PTRACE_WRITEDATA: {
498 int res = ptrace_writedata(child, (char __user *) addr2,
501 pt_succ_return(regs, 0);
506 pt_error_return(regs, -res);
509 case PTRACE_SYSCALL: /* continue and stop at (return from) syscall */
512 case PTRACE_CONT: { /* restart after signal. */
514 pt_error_return(regs, EIO);
518 unsigned long pc_mask = ~0UL;
520 if ((child->thread_info->flags & _TIF_32BIT) != 0)
521 pc_mask = 0xffffffff;
524 pt_error_return(regs, EINVAL);
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);
533 child->thread_info->kregs->tpc = (addr & pc_mask);
534 child->thread_info->kregs->tnpc = ((addr + 4) & pc_mask);
537 if (request == PTRACE_SYSCALL) {
538 set_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
540 clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
543 child->exit_code = data;
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);
551 wake_up_process(child);
552 pt_succ_return(regs, 0);
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
562 if (child->exit_state == EXIT_ZOMBIE) { /* already dead */
563 pt_succ_return(regs, 0);
566 child->exit_code = SIGKILL;
567 wake_up_process(child);
568 pt_succ_return(regs, 0);
572 case PTRACE_SUNDETACH: { /* detach a process that was attached. */
573 int error = ptrace_detach(child, data);
575 pt_error_return(regs, EIO);
578 pt_succ_return(regs, 0);
582 /* PTRACE_DUMPCORE unsupported... */
585 int err = ptrace_request(child, request, addr, data);
587 pt_error_return(regs, -err);
589 pt_succ_return(regs, 0);
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. */
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");
616 put_task_struct(child);
621 asmlinkage void syscall_trace(void)
624 printk("%s [%d]: syscall_trace\n", current->comm, current->pid);
626 if (!test_thread_flag(TIF_SYSCALL_TRACE))
628 if (!(current->ptrace & PT_PTRACED))
630 ptrace_notify(SIGTRAP | ((current->ptrace & PT_TRACESYSGOOD)
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
639 printk("%s [%d]: syscall_trace exit= %x\n", current->comm,
640 current->pid, current->exit_code);
642 if (current->exit_code) {
643 send_sig (current->exit_code, current, 1);
644 current->exit_code = 0;