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);
226 if ((current->personality == PER_SUNOS && request == PTRACE_SUNATTACH)
227 || (current->personality != PER_SUNOS && request == PTRACE_ATTACH)) {
228 if (ptrace_attach(child)) {
229 pt_error_return(regs, EPERM);
232 pt_succ_return(regs, 0);
236 ret = ptrace_check_attach(child, request == PTRACE_KILL);
238 pt_error_return(regs, -ret);
242 if (!(test_thread_flag(TIF_32BIT)) &&
243 ((request == PTRACE_READDATA64) ||
244 (request == PTRACE_WRITEDATA64) ||
245 (request == PTRACE_READTEXT64) ||
246 (request == PTRACE_WRITETEXT64) ||
247 (request == PTRACE_PEEKTEXT64) ||
248 (request == PTRACE_POKETEXT64) ||
249 (request == PTRACE_PEEKDATA64) ||
250 (request == PTRACE_POKEDATA64))) {
251 addr = regs->u_regs[UREG_G2];
252 addr2 = regs->u_regs[UREG_G3];
253 request -= 30; /* wheee... */
257 case PTRACE_PEEKTEXT: /* read word at location addr. */
258 case PTRACE_PEEKDATA: {
264 if (test_thread_flag(TIF_32BIT)) {
265 copied = access_process_vm(child, addr,
266 &tmp32, sizeof(tmp32), 0);
267 tmp64 = (unsigned long) tmp32;
268 if (copied == sizeof(tmp32))
271 copied = access_process_vm(child, addr,
272 &tmp64, sizeof(tmp64), 0);
273 if (copied == sizeof(tmp64))
277 pt_error_return(regs, -res);
279 pt_os_succ_return(regs, tmp64, (void __user *) data);
283 case PTRACE_POKETEXT: /* write the word at location addr. */
284 case PTRACE_POKEDATA: {
287 int copied, res = -EIO;
289 if (test_thread_flag(TIF_32BIT)) {
291 copied = access_process_vm(child, addr,
292 &tmp32, sizeof(tmp32), 1);
293 if (copied == sizeof(tmp32))
297 copied = access_process_vm(child, addr,
298 &tmp64, sizeof(tmp64), 1);
299 if (copied == sizeof(tmp64))
303 pt_error_return(regs, -res);
305 pt_succ_return(regs, res);
309 case PTRACE_GETREGS: {
310 struct pt_regs32 __user *pregs =
311 (struct pt_regs32 __user *) addr;
312 struct pt_regs *cregs = child->thread_info->kregs;
315 if (__put_user(tstate_to_psr(cregs->tstate), (&pregs->psr)) ||
316 __put_user(cregs->tpc, (&pregs->pc)) ||
317 __put_user(cregs->tnpc, (&pregs->npc)) ||
318 __put_user(cregs->y, (&pregs->y))) {
319 pt_error_return(regs, EFAULT);
322 for (rval = 1; rval < 16; rval++)
323 if (__put_user(cregs->u_regs[rval], (&pregs->u_regs[rval - 1]))) {
324 pt_error_return(regs, EFAULT);
327 pt_succ_return(regs, 0);
329 printk ("PC=%lx nPC=%lx o7=%lx\n", cregs->tpc, cregs->tnpc, cregs->u_regs [15]);
334 case PTRACE_GETREGS64: {
335 struct pt_regs __user *pregs = (struct pt_regs __user *) addr;
336 struct pt_regs *cregs = child->thread_info->kregs;
337 unsigned long tpc = cregs->tpc;
340 if ((child->thread_info->flags & _TIF_32BIT) != 0)
342 if (__put_user(cregs->tstate, (&pregs->tstate)) ||
343 __put_user(tpc, (&pregs->tpc)) ||
344 __put_user(cregs->tnpc, (&pregs->tnpc)) ||
345 __put_user(cregs->y, (&pregs->y))) {
346 pt_error_return(regs, EFAULT);
349 for (rval = 1; rval < 16; rval++)
350 if (__put_user(cregs->u_regs[rval], (&pregs->u_regs[rval - 1]))) {
351 pt_error_return(regs, EFAULT);
354 pt_succ_return(regs, 0);
356 printk ("PC=%lx nPC=%lx o7=%lx\n", cregs->tpc, cregs->tnpc, cregs->u_regs [15]);
361 case PTRACE_SETREGS: {
362 struct pt_regs32 __user *pregs =
363 (struct pt_regs32 __user *) addr;
364 struct pt_regs *cregs = child->thread_info->kregs;
365 unsigned int psr, pc, npc, y;
368 /* Must be careful, tracing process can only set certain
371 if (__get_user(psr, (&pregs->psr)) ||
372 __get_user(pc, (&pregs->pc)) ||
373 __get_user(npc, (&pregs->npc)) ||
374 __get_user(y, (&pregs->y))) {
375 pt_error_return(regs, EFAULT);
378 cregs->tstate &= ~(TSTATE_ICC);
379 cregs->tstate |= psr_to_tstate_icc(psr);
380 if (!((pc | npc) & 3)) {
385 for (i = 1; i < 16; i++) {
386 if (__get_user(cregs->u_regs[i], (&pregs->u_regs[i-1]))) {
387 pt_error_return(regs, EFAULT);
391 pt_succ_return(regs, 0);
395 case PTRACE_SETREGS64: {
396 struct pt_regs __user *pregs = (struct pt_regs __user *) addr;
397 struct pt_regs *cregs = child->thread_info->kregs;
398 unsigned long tstate, tpc, tnpc, y;
401 /* Must be careful, tracing process can only set certain
404 if (__get_user(tstate, (&pregs->tstate)) ||
405 __get_user(tpc, (&pregs->tpc)) ||
406 __get_user(tnpc, (&pregs->tnpc)) ||
407 __get_user(y, (&pregs->y))) {
408 pt_error_return(regs, EFAULT);
411 if ((child->thread_info->flags & _TIF_32BIT) != 0) {
415 tstate &= (TSTATE_ICC | TSTATE_XCC);
416 cregs->tstate &= ~(TSTATE_ICC | TSTATE_XCC);
417 cregs->tstate |= tstate;
418 if (!((tpc | tnpc) & 3)) {
423 for (i = 1; i < 16; i++) {
424 if (__get_user(cregs->u_regs[i], (&pregs->u_regs[i-1]))) {
425 pt_error_return(regs, EFAULT);
429 pt_succ_return(regs, 0);
433 case PTRACE_GETFPREGS: {
435 unsigned int regs[32];
441 unsigned int insnaddr;
445 struct fps __user *fps = (struct fps __user *) addr;
446 unsigned long *fpregs = child->thread_info->fpregs;
448 if (copy_to_user(&fps->regs[0], fpregs,
449 (32 * sizeof(unsigned int))) ||
450 __put_user(child->thread_info->xfsr[0], (&fps->fsr)) ||
451 __put_user(0, (&fps->fpqd)) ||
452 __put_user(0, (&fps->flags)) ||
453 __put_user(0, (&fps->extra)) ||
454 clear_user(&fps->fpq[0], 32 * sizeof(unsigned int))) {
455 pt_error_return(regs, EFAULT);
458 pt_succ_return(regs, 0);
462 case PTRACE_GETFPREGS64: {
464 unsigned int regs[64];
467 struct fps __user *fps = (struct fps __user *) addr;
468 unsigned long *fpregs = child->thread_info->fpregs;
470 if (copy_to_user(&fps->regs[0], fpregs,
471 (64 * sizeof(unsigned int))) ||
472 __put_user(child->thread_info->xfsr[0], (&fps->fsr))) {
473 pt_error_return(regs, EFAULT);
476 pt_succ_return(regs, 0);
480 case PTRACE_SETFPREGS: {
482 unsigned int regs[32];
488 unsigned int insnaddr;
492 struct fps __user *fps = (struct fps __user *) addr;
493 unsigned long *fpregs = child->thread_info->fpregs;
496 if (copy_from_user(fpregs, &fps->regs[0],
497 (32 * sizeof(unsigned int))) ||
498 __get_user(fsr, (&fps->fsr))) {
499 pt_error_return(regs, EFAULT);
502 child->thread_info->xfsr[0] &= 0xffffffff00000000UL;
503 child->thread_info->xfsr[0] |= fsr;
504 if (!(child->thread_info->fpsaved[0] & FPRS_FEF))
505 child->thread_info->gsr[0] = 0;
506 child->thread_info->fpsaved[0] |= (FPRS_FEF | FPRS_DL);
507 pt_succ_return(regs, 0);
511 case PTRACE_SETFPREGS64: {
513 unsigned int regs[64];
516 struct fps __user *fps = (struct fps __user *) addr;
517 unsigned long *fpregs = child->thread_info->fpregs;
519 if (copy_from_user(fpregs, &fps->regs[0],
520 (64 * sizeof(unsigned int))) ||
521 __get_user(child->thread_info->xfsr[0], (&fps->fsr))) {
522 pt_error_return(regs, EFAULT);
525 if (!(child->thread_info->fpsaved[0] & FPRS_FEF))
526 child->thread_info->gsr[0] = 0;
527 child->thread_info->fpsaved[0] |= (FPRS_FEF | FPRS_DL | FPRS_DU);
528 pt_succ_return(regs, 0);
532 case PTRACE_READTEXT:
533 case PTRACE_READDATA: {
534 int res = ptrace_readdata(child, addr,
535 (char __user *)addr2, data);
537 pt_succ_return(regs, 0);
542 pt_error_return(regs, -res);
546 case PTRACE_WRITETEXT:
547 case PTRACE_WRITEDATA: {
548 int res = ptrace_writedata(child, (char __user *) addr2,
551 pt_succ_return(regs, 0);
556 pt_error_return(regs, -res);
559 case PTRACE_SYSCALL: /* continue and stop at (return from) syscall */
562 case PTRACE_CONT: { /* restart after signal. */
563 if (!valid_signal(data)) {
564 pt_error_return(regs, EIO);
568 if (request == PTRACE_SYSCALL) {
569 set_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
571 clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
574 child->exit_code = data;
576 printk("CONT: %s [%d]: set exit_code = %x %lx %lx\n", child->comm,
577 child->pid, child->exit_code,
578 child->thread_info->kregs->tpc,
579 child->thread_info->kregs->tnpc);
582 wake_up_process(child);
583 pt_succ_return(regs, 0);
588 * make the child exit. Best I can do is send it a sigkill.
589 * perhaps it should be put in the status that it wants to
593 if (child->exit_state == EXIT_ZOMBIE) { /* already dead */
594 pt_succ_return(regs, 0);
597 child->exit_code = SIGKILL;
598 wake_up_process(child);
599 pt_succ_return(regs, 0);
603 case PTRACE_SUNDETACH: { /* detach a process that was attached. */
604 int error = ptrace_detach(child, data);
606 pt_error_return(regs, EIO);
609 pt_succ_return(regs, 0);
613 /* PTRACE_DUMPCORE unsupported... */
616 int err = ptrace_request(child, request, addr, data);
618 pt_error_return(regs, -err);
620 pt_succ_return(regs, 0);
626 put_task_struct(child);
631 asmlinkage void syscall_trace(void)
634 printk("%s [%d]: syscall_trace\n", current->comm, current->pid);
636 if (!test_thread_flag(TIF_SYSCALL_TRACE))
638 if (!(current->ptrace & PT_PTRACED))
640 ptrace_notify(SIGTRAP | ((current->ptrace & PT_TRACESYSGOOD)
644 * this isn't the same as continuing with a signal, but it will do
645 * for normal use. strace only continues with a signal if the
646 * stopping signal is not SIGTRAP. -brl
649 printk("%s [%d]: syscall_trace exit= %x\n", current->comm,
650 current->pid, current->exit_code);
652 if (current->exit_code) {
653 send_sig (current->exit_code, current, 1);
654 current->exit_code = 0;