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>
22 #include <linux/signal.h>
25 #include <asm/pgtable.h>
26 #include <asm/system.h>
27 #include <asm/uaccess.h>
28 #include <asm/psrcompat.h>
29 #include <asm/visasm.h>
30 #include <asm/spitfire.h>
32 /* Returning from ptrace is a bit tricky because the syscall return
33 * low level code assumes any value returned which is negative and
34 * is a valid errno will mean setting the condition codes to indicate
35 * an error return. This doesn't work, so we have this hook.
37 static inline void pt_error_return(struct pt_regs *regs, unsigned long error)
39 regs->u_regs[UREG_I0] = error;
40 regs->tstate |= (TSTATE_ICARRY | TSTATE_XCARRY);
41 regs->tpc = regs->tnpc;
45 static inline void pt_succ_return(struct pt_regs *regs, unsigned long value)
47 regs->u_regs[UREG_I0] = value;
48 regs->tstate &= ~(TSTATE_ICARRY | TSTATE_XCARRY);
49 regs->tpc = regs->tnpc;
54 pt_succ_return_linux(struct pt_regs *regs, unsigned long value, void __user *addr)
56 if (test_thread_flag(TIF_32BIT)) {
57 if (put_user(value, (unsigned int __user *) addr)) {
58 pt_error_return(regs, EFAULT);
62 if (put_user(value, (long __user *) addr)) {
63 pt_error_return(regs, EFAULT);
67 regs->u_regs[UREG_I0] = 0;
68 regs->tstate &= ~(TSTATE_ICARRY | TSTATE_XCARRY);
69 regs->tpc = regs->tnpc;
74 pt_os_succ_return (struct pt_regs *regs, unsigned long val, void __user *addr)
76 if (current->personality == PER_SUNOS)
77 pt_succ_return (regs, val);
79 pt_succ_return_linux (regs, val, addr);
82 /* #define ALLOW_INIT_TRACING */
83 /* #define DEBUG_PTRACE */
87 /* 0 */ "TRACEME", "PEEKTEXT", "PEEKDATA", "PEEKUSR",
88 /* 4 */ "POKETEXT", "POKEDATA", "POKEUSR", "CONT",
89 /* 8 */ "KILL", "SINGLESTEP", "SUNATTACH", "SUNDETACH",
90 /* 12 */ "GETREGS", "SETREGS", "GETFPREGS", "SETFPREGS",
91 /* 16 */ "READDATA", "WRITEDATA", "READTEXT", "WRITETEXT",
92 /* 20 */ "GETFPAREGS", "SETFPAREGS", "unknown", "unknown",
93 /* 24 */ "SYSCALL", ""
98 * Called by kernel/ptrace.c when detaching..
100 * Make sure single step bits etc are not set.
102 void ptrace_disable(struct task_struct *child)
107 /* To get the necessary page struct, access_process_vm() first calls
108 * get_user_pages(). This has done a flush_dcache_page() on the
109 * accessed page. Then our caller (copy_{to,from}_user_page()) did
110 * to memcpy to read/write the data from that page.
112 * Now, the only thing we have to do is:
113 * 1) flush the D-cache if it's possible than an illegal alias
115 * 2) flush the I-cache if this is pre-cheetah and we did a write
117 void flush_ptrace_access(struct vm_area_struct *vma, struct page *page,
118 unsigned long uaddr, void *kaddr,
119 unsigned long len, int write)
121 BUG_ON(len > PAGE_SIZE);
123 #ifdef DCACHE_ALIASING_POSSIBLE
124 /* If bit 13 of the kernel address we used to access the
125 * user page is the same as the virtual address that page
126 * is mapped to in the user's address space, we can skip the
129 if ((uaddr ^ kaddr) & (1UL << 13)) {
130 unsigned long start = __pa(kaddr);
131 unsigned long end = start + len;
133 if (tlb_type == spitfire) {
134 for (; start < end; start += 32)
135 spitfire_put_dcache_tag(va & 0x3fe0, 0x0);
137 for (; start < end; start += 32)
138 __asm__ __volatile__(
139 "stxa %%g0, [%0] %1\n\t"
143 "i" (ASI_DCACHE_INVALIDATE));
147 if (write && tlb_type == spitfire) {
148 unsigned long start = (unsigned long) kaddr;
149 unsigned long end = start + len;
151 for (; start < end; start += 32)
156 asmlinkage void do_ptrace(struct pt_regs *regs)
158 int request = regs->u_regs[UREG_I0];
159 pid_t pid = regs->u_regs[UREG_I1];
160 unsigned long addr = regs->u_regs[UREG_I2];
161 unsigned long data = regs->u_regs[UREG_I3];
162 unsigned long addr2 = regs->u_regs[UREG_I4];
163 struct task_struct *child;
166 if (test_thread_flag(TIF_32BIT)) {
167 addr &= 0xffffffffUL;
168 data &= 0xffffffffUL;
169 addr2 &= 0xffffffffUL;
176 if ((request >= 0) && (request <= 24))
181 if (request == PTRACE_POKEDATA && data == 0x91d02001){
182 printk ("do_ptrace: breakpoint pid=%d, addr=%016lx addr2=%016lx\n",
185 printk("do_ptrace: rq=%s(%d) pid=%d addr=%016lx data=%016lx addr2=%016lx\n",
186 s, request, pid, addr, data, addr2);
189 if (request == PTRACE_TRACEME) {
192 /* are we already being traced? */
193 if (current->ptrace & PT_PTRACED) {
194 pt_error_return(regs, EPERM);
197 ret = security_ptrace(current->parent, current);
199 pt_error_return(regs, -ret);
203 /* set the ptrace bit in the process flags. */
204 current->ptrace |= PT_PTRACED;
205 pt_succ_return(regs, 0);
208 #ifndef ALLOW_INIT_TRACING
210 /* Can't dork with init. */
211 pt_error_return(regs, EPERM);
215 read_lock(&tasklist_lock);
216 child = find_task_by_pid(pid);
218 get_task_struct(child);
219 read_unlock(&tasklist_lock);
222 pt_error_return(regs, ESRCH);
225 if (!vx_check(vx_task_xid(child), VX_WATCH|VX_IDENT)) {
226 pt_error_return(regs, ESRCH);
230 if ((current->personality == PER_SUNOS && request == PTRACE_SUNATTACH)
231 || (current->personality != PER_SUNOS && request == PTRACE_ATTACH)) {
232 if (ptrace_attach(child)) {
233 pt_error_return(regs, EPERM);
236 pt_succ_return(regs, 0);
240 ret = ptrace_check_attach(child, request == PTRACE_KILL);
242 pt_error_return(regs, -ret);
246 if (!(test_thread_flag(TIF_32BIT)) &&
247 ((request == PTRACE_READDATA64) ||
248 (request == PTRACE_WRITEDATA64) ||
249 (request == PTRACE_READTEXT64) ||
250 (request == PTRACE_WRITETEXT64) ||
251 (request == PTRACE_PEEKTEXT64) ||
252 (request == PTRACE_POKETEXT64) ||
253 (request == PTRACE_PEEKDATA64) ||
254 (request == PTRACE_POKEDATA64))) {
255 addr = regs->u_regs[UREG_G2];
256 addr2 = regs->u_regs[UREG_G3];
257 request -= 30; /* wheee... */
261 case PTRACE_PEEKTEXT: /* read word at location addr. */
262 case PTRACE_PEEKDATA: {
268 if (test_thread_flag(TIF_32BIT)) {
269 copied = access_process_vm(child, addr,
270 &tmp32, sizeof(tmp32), 0);
271 tmp64 = (unsigned long) tmp32;
272 if (copied == sizeof(tmp32))
275 copied = access_process_vm(child, addr,
276 &tmp64, sizeof(tmp64), 0);
277 if (copied == sizeof(tmp64))
281 pt_error_return(regs, -res);
283 pt_os_succ_return(regs, tmp64, (void __user *) data);
287 case PTRACE_POKETEXT: /* write the word at location addr. */
288 case PTRACE_POKEDATA: {
291 int copied, res = -EIO;
293 if (test_thread_flag(TIF_32BIT)) {
295 copied = access_process_vm(child, addr,
296 &tmp32, sizeof(tmp32), 1);
297 if (copied == sizeof(tmp32))
301 copied = access_process_vm(child, addr,
302 &tmp64, sizeof(tmp64), 1);
303 if (copied == sizeof(tmp64))
307 pt_error_return(regs, -res);
309 pt_succ_return(regs, res);
313 case PTRACE_GETREGS: {
314 struct pt_regs32 __user *pregs =
315 (struct pt_regs32 __user *) addr;
316 struct pt_regs *cregs = child->thread_info->kregs;
319 if (__put_user(tstate_to_psr(cregs->tstate), (&pregs->psr)) ||
320 __put_user(cregs->tpc, (&pregs->pc)) ||
321 __put_user(cregs->tnpc, (&pregs->npc)) ||
322 __put_user(cregs->y, (&pregs->y))) {
323 pt_error_return(regs, EFAULT);
326 for (rval = 1; rval < 16; rval++)
327 if (__put_user(cregs->u_regs[rval], (&pregs->u_regs[rval - 1]))) {
328 pt_error_return(regs, EFAULT);
331 pt_succ_return(regs, 0);
333 printk ("PC=%lx nPC=%lx o7=%lx\n", cregs->tpc, cregs->tnpc, cregs->u_regs [15]);
338 case PTRACE_GETREGS64: {
339 struct pt_regs __user *pregs = (struct pt_regs __user *) addr;
340 struct pt_regs *cregs = child->thread_info->kregs;
341 unsigned long tpc = cregs->tpc;
344 if ((child->thread_info->flags & _TIF_32BIT) != 0)
346 if (__put_user(cregs->tstate, (&pregs->tstate)) ||
347 __put_user(tpc, (&pregs->tpc)) ||
348 __put_user(cregs->tnpc, (&pregs->tnpc)) ||
349 __put_user(cregs->y, (&pregs->y))) {
350 pt_error_return(regs, EFAULT);
353 for (rval = 1; rval < 16; rval++)
354 if (__put_user(cregs->u_regs[rval], (&pregs->u_regs[rval - 1]))) {
355 pt_error_return(regs, EFAULT);
358 pt_succ_return(regs, 0);
360 printk ("PC=%lx nPC=%lx o7=%lx\n", cregs->tpc, cregs->tnpc, cregs->u_regs [15]);
365 case PTRACE_SETREGS: {
366 struct pt_regs32 __user *pregs =
367 (struct pt_regs32 __user *) addr;
368 struct pt_regs *cregs = child->thread_info->kregs;
369 unsigned int psr, pc, npc, y;
372 /* Must be careful, tracing process can only set certain
375 if (__get_user(psr, (&pregs->psr)) ||
376 __get_user(pc, (&pregs->pc)) ||
377 __get_user(npc, (&pregs->npc)) ||
378 __get_user(y, (&pregs->y))) {
379 pt_error_return(regs, EFAULT);
382 cregs->tstate &= ~(TSTATE_ICC);
383 cregs->tstate |= psr_to_tstate_icc(psr);
384 if (!((pc | npc) & 3)) {
389 for (i = 1; i < 16; i++) {
390 if (__get_user(cregs->u_regs[i], (&pregs->u_regs[i-1]))) {
391 pt_error_return(regs, EFAULT);
395 pt_succ_return(regs, 0);
399 case PTRACE_SETREGS64: {
400 struct pt_regs __user *pregs = (struct pt_regs __user *) addr;
401 struct pt_regs *cregs = child->thread_info->kregs;
402 unsigned long tstate, tpc, tnpc, y;
405 /* Must be careful, tracing process can only set certain
408 if (__get_user(tstate, (&pregs->tstate)) ||
409 __get_user(tpc, (&pregs->tpc)) ||
410 __get_user(tnpc, (&pregs->tnpc)) ||
411 __get_user(y, (&pregs->y))) {
412 pt_error_return(regs, EFAULT);
415 if ((child->thread_info->flags & _TIF_32BIT) != 0) {
419 tstate &= (TSTATE_ICC | TSTATE_XCC);
420 cregs->tstate &= ~(TSTATE_ICC | TSTATE_XCC);
421 cregs->tstate |= tstate;
422 if (!((tpc | tnpc) & 3)) {
427 for (i = 1; i < 16; i++) {
428 if (__get_user(cregs->u_regs[i], (&pregs->u_regs[i-1]))) {
429 pt_error_return(regs, EFAULT);
433 pt_succ_return(regs, 0);
437 case PTRACE_GETFPREGS: {
439 unsigned int regs[32];
445 unsigned int insnaddr;
449 struct fps __user *fps = (struct fps __user *) addr;
450 unsigned long *fpregs = child->thread_info->fpregs;
452 if (copy_to_user(&fps->regs[0], fpregs,
453 (32 * sizeof(unsigned int))) ||
454 __put_user(child->thread_info->xfsr[0], (&fps->fsr)) ||
455 __put_user(0, (&fps->fpqd)) ||
456 __put_user(0, (&fps->flags)) ||
457 __put_user(0, (&fps->extra)) ||
458 clear_user(&fps->fpq[0], 32 * sizeof(unsigned int))) {
459 pt_error_return(regs, EFAULT);
462 pt_succ_return(regs, 0);
466 case PTRACE_GETFPREGS64: {
468 unsigned int regs[64];
471 struct fps __user *fps = (struct fps __user *) addr;
472 unsigned long *fpregs = child->thread_info->fpregs;
474 if (copy_to_user(&fps->regs[0], fpregs,
475 (64 * sizeof(unsigned int))) ||
476 __put_user(child->thread_info->xfsr[0], (&fps->fsr))) {
477 pt_error_return(regs, EFAULT);
480 pt_succ_return(regs, 0);
484 case PTRACE_SETFPREGS: {
486 unsigned int regs[32];
492 unsigned int insnaddr;
496 struct fps __user *fps = (struct fps __user *) addr;
497 unsigned long *fpregs = child->thread_info->fpregs;
500 if (copy_from_user(fpregs, &fps->regs[0],
501 (32 * sizeof(unsigned int))) ||
502 __get_user(fsr, (&fps->fsr))) {
503 pt_error_return(regs, EFAULT);
506 child->thread_info->xfsr[0] &= 0xffffffff00000000UL;
507 child->thread_info->xfsr[0] |= fsr;
508 if (!(child->thread_info->fpsaved[0] & FPRS_FEF))
509 child->thread_info->gsr[0] = 0;
510 child->thread_info->fpsaved[0] |= (FPRS_FEF | FPRS_DL);
511 pt_succ_return(regs, 0);
515 case PTRACE_SETFPREGS64: {
517 unsigned int regs[64];
520 struct fps __user *fps = (struct fps __user *) addr;
521 unsigned long *fpregs = child->thread_info->fpregs;
523 if (copy_from_user(fpregs, &fps->regs[0],
524 (64 * sizeof(unsigned int))) ||
525 __get_user(child->thread_info->xfsr[0], (&fps->fsr))) {
526 pt_error_return(regs, EFAULT);
529 if (!(child->thread_info->fpsaved[0] & FPRS_FEF))
530 child->thread_info->gsr[0] = 0;
531 child->thread_info->fpsaved[0] |= (FPRS_FEF | FPRS_DL | FPRS_DU);
532 pt_succ_return(regs, 0);
536 case PTRACE_READTEXT:
537 case PTRACE_READDATA: {
538 int res = ptrace_readdata(child, addr,
539 (char __user *)addr2, data);
541 pt_succ_return(regs, 0);
546 pt_error_return(regs, -res);
550 case PTRACE_WRITETEXT:
551 case PTRACE_WRITEDATA: {
552 int res = ptrace_writedata(child, (char __user *) addr2,
555 pt_succ_return(regs, 0);
560 pt_error_return(regs, -res);
563 case PTRACE_SYSCALL: /* continue and stop at (return from) syscall */
566 case PTRACE_CONT: { /* restart after signal. */
567 if (!valid_signal(data)) {
568 pt_error_return(regs, EIO);
572 if (request == PTRACE_SYSCALL) {
573 set_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
575 clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
578 child->exit_code = data;
580 printk("CONT: %s [%d]: set exit_code = %x %lx %lx\n", child->comm,
581 child->pid, child->exit_code,
582 child->thread_info->kregs->tpc,
583 child->thread_info->kregs->tnpc);
586 wake_up_process(child);
587 pt_succ_return(regs, 0);
592 * make the child exit. Best I can do is send it a sigkill.
593 * perhaps it should be put in the status that it wants to
597 if (child->exit_state == EXIT_ZOMBIE) { /* already dead */
598 pt_succ_return(regs, 0);
601 child->exit_code = SIGKILL;
602 wake_up_process(child);
603 pt_succ_return(regs, 0);
607 case PTRACE_SUNDETACH: { /* detach a process that was attached. */
608 int error = ptrace_detach(child, data);
610 pt_error_return(regs, EIO);
613 pt_succ_return(regs, 0);
617 /* PTRACE_DUMPCORE unsupported... */
620 int err = ptrace_request(child, request, addr, data);
622 pt_error_return(regs, -err);
624 pt_succ_return(regs, 0);
630 put_task_struct(child);
635 asmlinkage void syscall_trace(void)
638 printk("%s [%d]: syscall_trace\n", current->comm, current->pid);
640 if (!test_thread_flag(TIF_SYSCALL_TRACE))
642 if (!(current->ptrace & PT_PTRACED))
644 ptrace_notify(SIGTRAP | ((current->ptrace & PT_TRACESYSGOOD)
648 * this isn't the same as continuing with a signal, but it will do
649 * for normal use. strace only continues with a signal if the
650 * stopping signal is not SIGTRAP. -brl
653 printk("%s [%d]: syscall_trace exit= %x\n", current->comm,
654 current->pid, current->exit_code);
656 if (current->exit_code) {
657 send_sig (current->exit_code, current, 1);
658 current->exit_code = 0;