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/seccomp.h>
23 #include <linux/audit.h>
24 #include <linux/signal.h>
27 #include <asm/pgtable.h>
28 #include <asm/system.h>
29 #include <asm/uaccess.h>
30 #include <asm/psrcompat.h>
31 #include <asm/visasm.h>
32 #include <asm/spitfire.h>
34 #include <asm/cpudata.h>
36 /* Returning from ptrace is a bit tricky because the syscall return
37 * low level code assumes any value returned which is negative and
38 * is a valid errno will mean setting the condition codes to indicate
39 * an error return. This doesn't work, so we have this hook.
41 static inline void pt_error_return(struct pt_regs *regs, unsigned long error)
43 regs->u_regs[UREG_I0] = error;
44 regs->tstate |= (TSTATE_ICARRY | TSTATE_XCARRY);
45 regs->tpc = regs->tnpc;
49 static inline void pt_succ_return(struct pt_regs *regs, unsigned long value)
51 regs->u_regs[UREG_I0] = value;
52 regs->tstate &= ~(TSTATE_ICARRY | TSTATE_XCARRY);
53 regs->tpc = regs->tnpc;
58 pt_succ_return_linux(struct pt_regs *regs, unsigned long value, void __user *addr)
60 if (test_thread_flag(TIF_32BIT)) {
61 if (put_user(value, (unsigned int __user *) addr)) {
62 pt_error_return(regs, EFAULT);
66 if (put_user(value, (long __user *) addr)) {
67 pt_error_return(regs, EFAULT);
71 regs->u_regs[UREG_I0] = 0;
72 regs->tstate &= ~(TSTATE_ICARRY | TSTATE_XCARRY);
73 regs->tpc = regs->tnpc;
78 pt_os_succ_return (struct pt_regs *regs, unsigned long val, void __user *addr)
80 if (current->personality == PER_SUNOS)
81 pt_succ_return (regs, val);
83 pt_succ_return_linux (regs, val, addr);
86 /* #define ALLOW_INIT_TRACING */
87 /* #define DEBUG_PTRACE */
91 /* 0 */ "TRACEME", "PEEKTEXT", "PEEKDATA", "PEEKUSR",
92 /* 4 */ "POKETEXT", "POKEDATA", "POKEUSR", "CONT",
93 /* 8 */ "KILL", "SINGLESTEP", "SUNATTACH", "SUNDETACH",
94 /* 12 */ "GETREGS", "SETREGS", "GETFPREGS", "SETFPREGS",
95 /* 16 */ "READDATA", "WRITEDATA", "READTEXT", "WRITETEXT",
96 /* 20 */ "GETFPAREGS", "SETFPAREGS", "unknown", "unknown",
97 /* 24 */ "SYSCALL", ""
102 * Called by kernel/ptrace.c when detaching..
104 * Make sure single step bits etc are not set.
106 void ptrace_disable(struct task_struct *child)
111 /* To get the necessary page struct, access_process_vm() first calls
112 * get_user_pages(). This has done a flush_dcache_page() on the
113 * accessed page. Then our caller (copy_{to,from}_user_page()) did
114 * to memcpy to read/write the data from that page.
116 * Now, the only thing we have to do is:
117 * 1) flush the D-cache if it's possible than an illegal alias
119 * 2) flush the I-cache if this is pre-cheetah and we did a write
121 void flush_ptrace_access(struct vm_area_struct *vma, struct page *page,
122 unsigned long uaddr, void *kaddr,
123 unsigned long len, int write)
125 BUG_ON(len > PAGE_SIZE);
127 if (tlb_type == hypervisor)
130 #ifdef DCACHE_ALIASING_POSSIBLE
131 /* If bit 13 of the kernel address we used to access the
132 * user page is the same as the virtual address that page
133 * is mapped to in the user's address space, we can skip the
136 if ((uaddr ^ (unsigned long) kaddr) & (1UL << 13)) {
137 unsigned long start = __pa(kaddr);
138 unsigned long end = start + len;
139 unsigned long dcache_line_size;
141 dcache_line_size = local_cpu_data().dcache_line_size;
143 if (tlb_type == spitfire) {
144 for (; start < end; start += dcache_line_size)
145 spitfire_put_dcache_tag(start & 0x3fe0, 0x0);
147 start &= ~(dcache_line_size - 1);
148 for (; start < end; start += dcache_line_size)
149 __asm__ __volatile__(
150 "stxa %%g0, [%0] %1\n\t"
154 "i" (ASI_DCACHE_INVALIDATE));
158 if (write && tlb_type == spitfire) {
159 unsigned long start = (unsigned long) kaddr;
160 unsigned long end = start + len;
161 unsigned long icache_line_size;
163 icache_line_size = local_cpu_data().icache_line_size;
165 for (; start < end; start += icache_line_size)
170 asmlinkage void do_ptrace(struct pt_regs *regs)
172 int request = regs->u_regs[UREG_I0];
173 pid_t pid = regs->u_regs[UREG_I1];
174 unsigned long addr = regs->u_regs[UREG_I2];
175 unsigned long data = regs->u_regs[UREG_I3];
176 unsigned long addr2 = regs->u_regs[UREG_I4];
177 struct task_struct *child;
180 if (test_thread_flag(TIF_32BIT)) {
181 addr &= 0xffffffffUL;
182 data &= 0xffffffffUL;
183 addr2 &= 0xffffffffUL;
190 if ((request >= 0) && (request <= 24))
195 if (request == PTRACE_POKEDATA && data == 0x91d02001){
196 printk ("do_ptrace: breakpoint pid=%d, addr=%016lx addr2=%016lx\n",
199 printk("do_ptrace: rq=%s(%d) pid=%d addr=%016lx data=%016lx addr2=%016lx\n",
200 s, request, pid, addr, data, addr2);
203 if (request == PTRACE_TRACEME) {
204 ret = ptrace_traceme();
205 pt_succ_return(regs, 0);
209 child = ptrace_get_task_struct(pid);
211 ret = PTR_ERR(child);
212 pt_error_return(regs, -ret);
215 if (!vx_check(vx_task_xid(child), VX_WATCH|VX_IDENT)) {
216 pt_error_return(regs, ESRCH);
220 if ((current->personality == PER_SUNOS && request == PTRACE_SUNATTACH)
221 || (current->personality != PER_SUNOS && request == PTRACE_ATTACH)) {
222 if (ptrace_attach(child)) {
223 pt_error_return(regs, EPERM);
226 pt_succ_return(regs, 0);
230 ret = ptrace_check_attach(child, request == PTRACE_KILL);
232 pt_error_return(regs, -ret);
236 if (!(test_thread_flag(TIF_32BIT)) &&
237 ((request == PTRACE_READDATA64) ||
238 (request == PTRACE_WRITEDATA64) ||
239 (request == PTRACE_READTEXT64) ||
240 (request == PTRACE_WRITETEXT64) ||
241 (request == PTRACE_PEEKTEXT64) ||
242 (request == PTRACE_POKETEXT64) ||
243 (request == PTRACE_PEEKDATA64) ||
244 (request == PTRACE_POKEDATA64))) {
245 addr = regs->u_regs[UREG_G2];
246 addr2 = regs->u_regs[UREG_G3];
247 request -= 30; /* wheee... */
253 pt_error_return(regs, EIO);
255 pt_succ_return(regs, 0);
258 case PTRACE_PEEKTEXT: /* read word at location addr. */
259 case PTRACE_PEEKDATA: {
265 if (test_thread_flag(TIF_32BIT)) {
266 copied = access_process_vm(child, addr,
267 &tmp32, sizeof(tmp32), 0);
268 tmp64 = (unsigned long) tmp32;
269 if (copied == sizeof(tmp32))
272 copied = access_process_vm(child, addr,
273 &tmp64, sizeof(tmp64), 0);
274 if (copied == sizeof(tmp64))
278 pt_error_return(regs, -res);
280 pt_os_succ_return(regs, tmp64, (void __user *) data);
284 case PTRACE_POKETEXT: /* write the word at location addr. */
285 case PTRACE_POKEDATA: {
288 int copied, res = -EIO;
290 if (test_thread_flag(TIF_32BIT)) {
292 copied = access_process_vm(child, addr,
293 &tmp32, sizeof(tmp32), 1);
294 if (copied == sizeof(tmp32))
298 copied = access_process_vm(child, addr,
299 &tmp64, sizeof(tmp64), 1);
300 if (copied == sizeof(tmp64))
304 pt_error_return(regs, -res);
306 pt_succ_return(regs, res);
310 case PTRACE_GETREGS: {
311 struct pt_regs32 __user *pregs =
312 (struct pt_regs32 __user *) addr;
313 struct pt_regs *cregs = task_pt_regs(child);
316 if (__put_user(tstate_to_psr(cregs->tstate), (&pregs->psr)) ||
317 __put_user(cregs->tpc, (&pregs->pc)) ||
318 __put_user(cregs->tnpc, (&pregs->npc)) ||
319 __put_user(cregs->y, (&pregs->y))) {
320 pt_error_return(regs, EFAULT);
323 for (rval = 1; rval < 16; rval++)
324 if (__put_user(cregs->u_regs[rval], (&pregs->u_regs[rval - 1]))) {
325 pt_error_return(regs, EFAULT);
328 pt_succ_return(regs, 0);
330 printk ("PC=%lx nPC=%lx o7=%lx\n", cregs->tpc, cregs->tnpc, cregs->u_regs [15]);
335 case PTRACE_GETREGS64: {
336 struct pt_regs __user *pregs = (struct pt_regs __user *) addr;
337 struct pt_regs *cregs = task_pt_regs(child);
338 unsigned long tpc = cregs->tpc;
341 if ((task_thread_info(child)->flags & _TIF_32BIT) != 0)
343 if (__put_user(cregs->tstate, (&pregs->tstate)) ||
344 __put_user(tpc, (&pregs->tpc)) ||
345 __put_user(cregs->tnpc, (&pregs->tnpc)) ||
346 __put_user(cregs->y, (&pregs->y))) {
347 pt_error_return(regs, EFAULT);
350 for (rval = 1; rval < 16; rval++)
351 if (__put_user(cregs->u_regs[rval], (&pregs->u_regs[rval - 1]))) {
352 pt_error_return(regs, EFAULT);
355 pt_succ_return(regs, 0);
357 printk ("PC=%lx nPC=%lx o7=%lx\n", cregs->tpc, cregs->tnpc, cregs->u_regs [15]);
362 case PTRACE_SETREGS: {
363 struct pt_regs32 __user *pregs =
364 (struct pt_regs32 __user *) addr;
365 struct pt_regs *cregs = task_pt_regs(child);
366 unsigned int psr, pc, npc, y;
369 /* Must be careful, tracing process can only set certain
372 if (__get_user(psr, (&pregs->psr)) ||
373 __get_user(pc, (&pregs->pc)) ||
374 __get_user(npc, (&pregs->npc)) ||
375 __get_user(y, (&pregs->y))) {
376 pt_error_return(regs, EFAULT);
379 cregs->tstate &= ~(TSTATE_ICC);
380 cregs->tstate |= psr_to_tstate_icc(psr);
381 if (!((pc | npc) & 3)) {
386 for (i = 1; i < 16; i++) {
387 if (__get_user(cregs->u_regs[i], (&pregs->u_regs[i-1]))) {
388 pt_error_return(regs, EFAULT);
392 pt_succ_return(regs, 0);
396 case PTRACE_SETREGS64: {
397 struct pt_regs __user *pregs = (struct pt_regs __user *) addr;
398 struct pt_regs *cregs = task_pt_regs(child);
399 unsigned long tstate, tpc, tnpc, y;
402 /* Must be careful, tracing process can only set certain
405 if (__get_user(tstate, (&pregs->tstate)) ||
406 __get_user(tpc, (&pregs->tpc)) ||
407 __get_user(tnpc, (&pregs->tnpc)) ||
408 __get_user(y, (&pregs->y))) {
409 pt_error_return(regs, EFAULT);
412 if ((task_thread_info(child)->flags & _TIF_32BIT) != 0) {
416 tstate &= (TSTATE_ICC | TSTATE_XCC);
417 cregs->tstate &= ~(TSTATE_ICC | TSTATE_XCC);
418 cregs->tstate |= tstate;
419 if (!((tpc | tnpc) & 3)) {
424 for (i = 1; i < 16; i++) {
425 if (__get_user(cregs->u_regs[i], (&pregs->u_regs[i-1]))) {
426 pt_error_return(regs, EFAULT);
430 pt_succ_return(regs, 0);
434 case PTRACE_GETFPREGS: {
436 unsigned int regs[32];
442 unsigned int insnaddr;
446 struct fps __user *fps = (struct fps __user *) addr;
447 unsigned long *fpregs = task_thread_info(child)->fpregs;
449 if (copy_to_user(&fps->regs[0], fpregs,
450 (32 * sizeof(unsigned int))) ||
451 __put_user(task_thread_info(child)->xfsr[0], (&fps->fsr)) ||
452 __put_user(0, (&fps->fpqd)) ||
453 __put_user(0, (&fps->flags)) ||
454 __put_user(0, (&fps->extra)) ||
455 clear_user(&fps->fpq[0], 32 * sizeof(unsigned int))) {
456 pt_error_return(regs, EFAULT);
459 pt_succ_return(regs, 0);
463 case PTRACE_GETFPREGS64: {
465 unsigned int regs[64];
468 struct fps __user *fps = (struct fps __user *) addr;
469 unsigned long *fpregs = task_thread_info(child)->fpregs;
471 if (copy_to_user(&fps->regs[0], fpregs,
472 (64 * sizeof(unsigned int))) ||
473 __put_user(task_thread_info(child)->xfsr[0], (&fps->fsr))) {
474 pt_error_return(regs, EFAULT);
477 pt_succ_return(regs, 0);
481 case PTRACE_SETFPREGS: {
483 unsigned int regs[32];
489 unsigned int insnaddr;
493 struct fps __user *fps = (struct fps __user *) addr;
494 unsigned long *fpregs = task_thread_info(child)->fpregs;
497 if (copy_from_user(fpregs, &fps->regs[0],
498 (32 * sizeof(unsigned int))) ||
499 __get_user(fsr, (&fps->fsr))) {
500 pt_error_return(regs, EFAULT);
503 task_thread_info(child)->xfsr[0] &= 0xffffffff00000000UL;
504 task_thread_info(child)->xfsr[0] |= fsr;
505 if (!(task_thread_info(child)->fpsaved[0] & FPRS_FEF))
506 task_thread_info(child)->gsr[0] = 0;
507 task_thread_info(child)->fpsaved[0] |= (FPRS_FEF | FPRS_DL);
508 pt_succ_return(regs, 0);
512 case PTRACE_SETFPREGS64: {
514 unsigned int regs[64];
517 struct fps __user *fps = (struct fps __user *) addr;
518 unsigned long *fpregs = task_thread_info(child)->fpregs;
520 if (copy_from_user(fpregs, &fps->regs[0],
521 (64 * sizeof(unsigned int))) ||
522 __get_user(task_thread_info(child)->xfsr[0], (&fps->fsr))) {
523 pt_error_return(regs, EFAULT);
526 if (!(task_thread_info(child)->fpsaved[0] & FPRS_FEF))
527 task_thread_info(child)->gsr[0] = 0;
528 task_thread_info(child)->fpsaved[0] |= (FPRS_FEF | FPRS_DL | FPRS_DU);
529 pt_succ_return(regs, 0);
533 case PTRACE_READTEXT:
534 case PTRACE_READDATA: {
535 int res = ptrace_readdata(child, addr,
536 (char __user *)addr2, data);
538 pt_succ_return(regs, 0);
543 pt_error_return(regs, -res);
547 case PTRACE_WRITETEXT:
548 case PTRACE_WRITEDATA: {
549 int res = ptrace_writedata(child, (char __user *) addr2,
552 pt_succ_return(regs, 0);
557 pt_error_return(regs, -res);
560 case PTRACE_SYSCALL: /* continue and stop at (return from) syscall */
563 case PTRACE_CONT: { /* restart after signal. */
564 if (!valid_signal(data)) {
565 pt_error_return(regs, EIO);
569 if (request == PTRACE_SYSCALL) {
570 set_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
572 clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
575 child->exit_code = data;
577 printk("CONT: %s [%d]: set exit_code = %x %lx %lx\n", child->comm,
578 child->pid, child->exit_code,
579 task_pt_regs(child)->tpc,
580 task_pt_regs(child)->tnpc);
583 wake_up_process(child);
584 pt_succ_return(regs, 0);
589 * make the child exit. Best I can do is send it a sigkill.
590 * perhaps it should be put in the status that it wants to
594 if (child->exit_state == EXIT_ZOMBIE) { /* already dead */
595 pt_succ_return(regs, 0);
598 child->exit_code = SIGKILL;
599 wake_up_process(child);
600 pt_succ_return(regs, 0);
604 case PTRACE_SUNDETACH: { /* detach a process that was attached. */
605 int error = ptrace_detach(child, data);
607 pt_error_return(regs, EIO);
610 pt_succ_return(regs, 0);
614 /* PTRACE_DUMPCORE unsupported... */
616 case PTRACE_GETEVENTMSG: {
619 if (test_thread_flag(TIF_32BIT))
620 err = put_user(child->ptrace_message,
621 (unsigned int __user *) data);
623 err = put_user(child->ptrace_message,
624 (unsigned long __user *) data);
626 pt_error_return(regs, -err);
628 pt_succ_return(regs, 0);
633 int err = ptrace_request(child, request, addr, data);
635 pt_error_return(regs, -err);
637 pt_succ_return(regs, 0);
643 put_task_struct(child);
648 asmlinkage void syscall_trace(struct pt_regs *regs, int syscall_exit_p)
650 /* do the secure computing check first */
651 secure_computing(regs->u_regs[UREG_G1]);
653 if (unlikely(current->audit_context) && syscall_exit_p) {
654 unsigned long tstate = regs->tstate;
655 int result = AUDITSC_SUCCESS;
657 if (unlikely(tstate & (TSTATE_XCARRY | TSTATE_ICARRY)))
658 result = AUDITSC_FAILURE;
660 audit_syscall_exit(result, regs->u_regs[UREG_I0]);
663 if (!(current->ptrace & PT_PTRACED))
666 if (!test_thread_flag(TIF_SYSCALL_TRACE))
669 ptrace_notify(SIGTRAP | ((current->ptrace & PT_TRACESYSGOOD)
673 * this isn't the same as continuing with a signal, but it will do
674 * for normal use. strace only continues with a signal if the
675 * stopping signal is not SIGTRAP. -brl
677 if (current->exit_code) {
678 send_sig(current->exit_code, current, 1);
679 current->exit_code = 0;
683 if (unlikely(current->audit_context) && !syscall_exit_p)
684 audit_syscall_entry((test_thread_flag(TIF_32BIT) ?
687 regs->u_regs[UREG_G1],
688 regs->u_regs[UREG_I0],
689 regs->u_regs[UREG_I1],
690 regs->u_regs[UREG_I2],
691 regs->u_regs[UREG_I3]);