1 /* ptrace.c: Sparc process tracing support.
3 * Copyright (C) 1996 David S. Miller (davem@caipfs.rutgers.edu)
5 * Based upon code written by Ross Biro, Linus Torvalds, Bob Manson,
8 * Added Linux support -miguel (weird, eh?, the orignal code was meant
12 #include <linux/kernel.h>
13 #include <linux/sched.h>
15 #include <linux/errno.h>
16 #include <linux/ptrace.h>
17 #include <linux/user.h>
18 #include <linux/smp.h>
19 #include <linux/smp_lock.h>
20 #include <linux/security.h>
21 #include <linux/signal.h>
23 #include <asm/pgtable.h>
24 #include <asm/system.h>
25 #include <asm/uaccess.h>
27 #define MAGIC_CONSTANT 0x80000000
30 /* Returning from ptrace is a bit tricky because the syscall return
31 * low level code assumes any value returned which is negative and
32 * is a valid errno will mean setting the condition codes to indicate
33 * an error return. This doesn't work, so we have this hook.
35 static inline void pt_error_return(struct pt_regs *regs, unsigned long error)
37 regs->u_regs[UREG_I0] = error;
43 static inline void pt_succ_return(struct pt_regs *regs, unsigned long value)
45 regs->u_regs[UREG_I0] = value;
52 pt_succ_return_linux(struct pt_regs *regs, unsigned long value, long __user *addr)
54 if (put_user(value, addr)) {
55 pt_error_return(regs, EFAULT);
58 regs->u_regs[UREG_I0] = 0;
65 pt_os_succ_return (struct pt_regs *regs, unsigned long val, long __user *addr)
67 if (current->personality == PER_SUNOS)
68 pt_succ_return (regs, val);
70 pt_succ_return_linux (regs, val, addr);
73 /* Fuck me gently with a chainsaw... */
74 static inline void read_sunos_user(struct pt_regs *regs, unsigned long offset,
75 struct task_struct *tsk, long __user *addr)
77 struct pt_regs *cregs = tsk->thread.kregs;
78 struct thread_info *t = task_thread_info(tsk);
82 offset -= 1024; /* whee... */
83 if(offset & ((sizeof(unsigned long) - 1))) {
84 pt_error_return(regs, EIO);
87 if(offset >= 16 && offset < 784) {
88 offset -= 16; offset >>= 2;
89 pt_os_succ_return(regs, *(((unsigned long *)(&t->reg_window[0]))+offset), addr);
92 if(offset >= 784 && offset < 832) {
93 offset -= 784; offset >>= 2;
94 pt_os_succ_return(regs, *(((unsigned long *)(&t->rwbuf_stkptrs[0]))+offset), addr);
114 v = cregs->u_regs[UREG_I0];
117 v = cregs->u_regs[UREG_I1];
120 v = cregs->u_regs[UREG_I2];
123 v = cregs->u_regs[UREG_I3];
126 v = cregs->u_regs[UREG_I4];
129 v = cregs->u_regs[UREG_I5];
132 v = cregs->u_regs[UREG_I6];
135 if(tsk->thread.flags & MAGIC_CONSTANT)
136 v = cregs->u_regs[UREG_G1];
141 v = cregs->u_regs[UREG_I0];
144 v = cregs->u_regs[UREG_I1];
148 /* Isn't binary compatibility _fun_??? */
149 if(cregs->psr & PSR_C)
150 v = cregs->u_regs[UREG_I0] << 24;
155 /* Rest of them are completely unsupported. */
157 printk("%s [%d]: Wants to read user offset %ld\n",
158 current->comm, current->pid, offset);
159 pt_error_return(regs, EIO);
162 if (current->personality == PER_SUNOS)
163 pt_succ_return (regs, v);
165 pt_succ_return_linux (regs, v, addr);
169 static inline void write_sunos_user(struct pt_regs *regs, unsigned long offset,
170 struct task_struct *tsk)
172 struct pt_regs *cregs = tsk->thread.kregs;
173 struct thread_info *t = task_thread_info(tsk);
174 unsigned long value = regs->u_regs[UREG_I3];
177 offset -= 1024; /* whee... */
178 if(offset & ((sizeof(unsigned long) - 1)))
180 if(offset >= 16 && offset < 784) {
181 offset -= 16; offset >>= 2;
182 *(((unsigned long *)(&t->reg_window[0]))+offset) = value;
185 if(offset >= 784 && offset < 832) {
186 offset -= 784; offset >>= 2;
187 *(((unsigned long *)(&t->rwbuf_stkptrs[0]))+offset) = value;
192 cregs->u_regs[UREG_I0] = value;
195 cregs->u_regs[UREG_I1] = value;
198 cregs->u_regs[UREG_I2] = value;
201 cregs->u_regs[UREG_I3] = value;
204 cregs->u_regs[UREG_I4] = value;
207 cregs->u_regs[UREG_I5] = value;
210 cregs->u_regs[UREG_I6] = value;
213 cregs->u_regs[UREG_I7] = value;
216 cregs->u_regs[UREG_I0] = value;
219 cregs->u_regs[UREG_I1] = value;
222 /* Rest of them are completely unsupported or "no-touch". */
224 printk("%s [%d]: Wants to write user offset %ld\n",
225 current->comm, current->pid, offset);
229 pt_succ_return(regs, 0);
232 pt_error_return(regs, EIO);
236 /* #define ALLOW_INIT_TRACING */
237 /* #define DEBUG_PTRACE */
241 /* 0 */ "TRACEME", "PEEKTEXT", "PEEKDATA", "PEEKUSR",
242 /* 4 */ "POKETEXT", "POKEDATA", "POKEUSR", "CONT",
243 /* 8 */ "KILL", "SINGLESTEP", "SUNATTACH", "SUNDETACH",
244 /* 12 */ "GETREGS", "SETREGS", "GETFPREGS", "SETFPREGS",
245 /* 16 */ "READDATA", "WRITEDATA", "READTEXT", "WRITETEXT",
246 /* 20 */ "GETFPAREGS", "SETFPAREGS", "unknown", "unknown",
247 /* 24 */ "SYSCALL", ""
252 * Called by kernel/ptrace.c when detaching..
254 * Make sure single step bits etc are not set.
256 void ptrace_disable(struct task_struct *child)
261 asmlinkage void do_ptrace(struct pt_regs *regs)
263 unsigned long request = regs->u_regs[UREG_I0];
264 unsigned long pid = regs->u_regs[UREG_I1];
265 unsigned long addr = regs->u_regs[UREG_I2];
266 unsigned long data = regs->u_regs[UREG_I3];
267 unsigned long addr2 = regs->u_regs[UREG_I4];
268 struct task_struct *child;
276 if ((request >= 0) && (request <= 24))
281 if (request == PTRACE_POKEDATA && data == 0x91d02001){
282 printk ("do_ptrace: breakpoint pid=%d, addr=%08lx addr2=%08lx\n",
285 printk("do_ptrace: rq=%s(%d) pid=%d addr=%08lx data=%08lx addr2=%08lx\n",
286 s, (int) request, (int) pid, addr, data, addr2);
290 if (request == PTRACE_TRACEME) {
291 ret = ptrace_traceme();
292 pt_succ_return(regs, 0);
296 child = ptrace_get_task_struct(pid);
298 ret = PTR_ERR(child);
299 pt_error_return(regs, -ret);
303 if ((current->personality == PER_SUNOS && request == PTRACE_SUNATTACH)
304 || (current->personality != PER_SUNOS && request == PTRACE_ATTACH)) {
305 if (ptrace_attach(child)) {
306 pt_error_return(regs, EPERM);
309 pt_succ_return(regs, 0);
313 ret = ptrace_check_attach(child, request == PTRACE_KILL);
315 pt_error_return(regs, -ret);
320 case PTRACE_PEEKTEXT: /* read word at location addr. */
321 case PTRACE_PEEKDATA: {
324 if (access_process_vm(child, addr,
325 &tmp, sizeof(tmp), 0) == sizeof(tmp))
326 pt_os_succ_return(regs, tmp, (long __user *)data);
328 pt_error_return(regs, EIO);
333 read_sunos_user(regs, addr, child, (long __user *) data);
337 write_sunos_user(regs, addr, child);
340 case PTRACE_POKETEXT: /* write the word at location addr. */
341 case PTRACE_POKEDATA: {
342 if (access_process_vm(child, addr,
343 &data, sizeof(data), 1) == sizeof(data))
344 pt_succ_return(regs, 0);
346 pt_error_return(regs, EIO);
350 case PTRACE_GETREGS: {
351 struct pt_regs __user *pregs = (struct pt_regs __user *) addr;
352 struct pt_regs *cregs = child->thread.kregs;
355 if (!access_ok(VERIFY_WRITE, pregs, sizeof(struct pt_regs))) {
357 pt_error_return(regs, -rval);
360 __put_user(cregs->psr, (&pregs->psr));
361 __put_user(cregs->pc, (&pregs->pc));
362 __put_user(cregs->npc, (&pregs->npc));
363 __put_user(cregs->y, (&pregs->y));
364 for(rval = 1; rval < 16; rval++)
365 __put_user(cregs->u_regs[rval], (&pregs->u_regs[rval - 1]));
366 pt_succ_return(regs, 0);
368 printk ("PC=%x nPC=%x o7=%x\n", cregs->pc, cregs->npc, cregs->u_regs [15]);
373 case PTRACE_SETREGS: {
374 struct pt_regs __user *pregs = (struct pt_regs __user *) addr;
375 struct pt_regs *cregs = child->thread.kregs;
376 unsigned long psr, pc, npc, y;
379 /* Must be careful, tracing process can only set certain
382 if (!access_ok(VERIFY_READ, pregs, sizeof(struct pt_regs))) {
383 pt_error_return(regs, EFAULT);
386 __get_user(psr, (&pregs->psr));
387 __get_user(pc, (&pregs->pc));
388 __get_user(npc, (&pregs->npc));
389 __get_user(y, (&pregs->y));
391 cregs->psr &= ~PSR_ICC;
393 if (!((pc | npc) & 3)) {
398 for(i = 1; i < 16; i++)
399 __get_user(cregs->u_regs[i], (&pregs->u_regs[i-1]));
400 pt_succ_return(regs, 0);
404 case PTRACE_GETFPREGS: {
406 unsigned long regs[32];
412 unsigned long *insnaddr;
416 struct fps __user *fps = (struct fps __user *) addr;
419 if (!access_ok(VERIFY_WRITE, fps, sizeof(struct fps))) {
421 pt_error_return(regs, -i);
424 for(i = 0; i < 32; i++)
425 __put_user(child->thread.float_regs[i], (&fps->regs[i]));
426 __put_user(child->thread.fsr, (&fps->fsr));
427 __put_user(child->thread.fpqdepth, (&fps->fpqd));
428 __put_user(0, (&fps->flags));
429 __put_user(0, (&fps->extra));
430 for(i = 0; i < 16; i++) {
431 __put_user(child->thread.fpqueue[i].insn_addr,
432 (&fps->fpq[i].insnaddr));
433 __put_user(child->thread.fpqueue[i].insn, (&fps->fpq[i].insn));
435 pt_succ_return(regs, 0);
439 case PTRACE_SETFPREGS: {
441 unsigned long regs[32];
447 unsigned long *insnaddr;
451 struct fps __user *fps = (struct fps __user *) addr;
454 if (!access_ok(VERIFY_READ, fps, sizeof(struct fps))) {
456 pt_error_return(regs, -i);
459 copy_from_user(&child->thread.float_regs[0], &fps->regs[0], (32 * sizeof(unsigned long)));
460 __get_user(child->thread.fsr, (&fps->fsr));
461 __get_user(child->thread.fpqdepth, (&fps->fpqd));
462 for(i = 0; i < 16; i++) {
463 __get_user(child->thread.fpqueue[i].insn_addr,
464 (&fps->fpq[i].insnaddr));
465 __get_user(child->thread.fpqueue[i].insn, (&fps->fpq[i].insn));
467 pt_succ_return(regs, 0);
471 case PTRACE_READTEXT:
472 case PTRACE_READDATA: {
473 int res = ptrace_readdata(child, addr,
474 (void __user *) addr2, data);
477 pt_succ_return(regs, 0);
480 /* Partial read is an IO failure */
483 pt_error_return(regs, -res);
487 case PTRACE_WRITETEXT:
488 case PTRACE_WRITEDATA: {
489 int res = ptrace_writedata(child, (void __user *) addr2,
493 pt_succ_return(regs, 0);
496 /* Partial write is an IO failure */
499 pt_error_return(regs, -res);
503 case PTRACE_SYSCALL: /* continue and stop at (return from) syscall */
506 case PTRACE_CONT: { /* restart after signal. */
507 if (!valid_signal(data)) {
508 pt_error_return(regs, EIO);
512 if (request == PTRACE_SYSCALL)
513 set_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
515 clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
517 child->exit_code = data;
519 printk("CONT: %s [%d]: set exit_code = %x %lx %lx\n",
520 child->comm, child->pid, child->exit_code,
521 child->thread.kregs->pc,
522 child->thread.kregs->npc);
524 wake_up_process(child);
525 pt_succ_return(regs, 0);
530 * make the child exit. Best I can do is send it a sigkill.
531 * perhaps it should be put in the status that it wants to
535 if (child->exit_state == EXIT_ZOMBIE) { /* already dead */
536 pt_succ_return(regs, 0);
539 wake_up_process(child);
540 child->exit_code = SIGKILL;
541 pt_succ_return(regs, 0);
545 case PTRACE_SUNDETACH: { /* detach a process that was attached. */
546 int err = ptrace_detach(child, data);
548 pt_error_return(regs, EIO);
551 pt_succ_return(regs, 0);
555 /* PTRACE_DUMPCORE unsupported... */
558 int err = ptrace_request(child, request, addr, data);
560 pt_error_return(regs, -err);
562 pt_succ_return(regs, 0);
568 put_task_struct(child);
573 asmlinkage void syscall_trace(void)
576 printk("%s [%d]: syscall_trace\n", current->comm, current->pid);
578 if (!test_thread_flag(TIF_SYSCALL_TRACE))
580 if (!(current->ptrace & PT_PTRACED))
582 current->thread.flags ^= MAGIC_CONSTANT;
583 ptrace_notify(SIGTRAP | ((current->ptrace & PT_TRACESYSGOOD)
586 * this isn't the same as continuing with a signal, but it will do
587 * for normal use. strace only continues with a signal if the
588 * stopping signal is not SIGTRAP. -brl
591 printk("%s [%d]: syscall_trace exit= %x\n", current->comm,
592 current->pid, current->exit_code);
594 if (current->exit_code) {
595 send_sig (current->exit_code, current, 1);
596 current->exit_code = 0;