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>
22 #include <asm/pgtable.h>
23 #include <asm/system.h>
24 #include <asm/uaccess.h>
26 #define MAGIC_CONSTANT 0x80000000
29 /* Returning from ptrace is a bit tricky because the syscall return
30 * low level code assumes any value returned which is negative and
31 * is a valid errno will mean setting the condition codes to indicate
32 * an error return. This doesn't work, so we have this hook.
34 static inline void pt_error_return(struct pt_regs *regs, unsigned long error)
36 regs->u_regs[UREG_I0] = error;
42 static inline void pt_succ_return(struct pt_regs *regs, unsigned long value)
44 regs->u_regs[UREG_I0] = value;
51 pt_succ_return_linux(struct pt_regs *regs, unsigned long value, long *addr)
53 if(put_user(value, addr))
54 return pt_error_return(regs, EFAULT);
55 regs->u_regs[UREG_I0] = 0;
62 pt_os_succ_return (struct pt_regs *regs, unsigned long val, long *addr)
64 if (current->personality == PER_SUNOS)
65 pt_succ_return (regs, val);
67 pt_succ_return_linux (regs, val, addr);
70 /* Fuck me gently with a chainsaw... */
71 static inline void read_sunos_user(struct pt_regs *regs, unsigned long offset,
72 struct task_struct *tsk, long *addr)
74 struct pt_regs *cregs = tsk->thread.kregs;
75 struct thread_info *t = tsk->thread_info;
79 offset -= 1024; /* whee... */
80 if(offset & ((sizeof(unsigned long) - 1))) {
81 pt_error_return(regs, EIO);
84 if(offset >= 16 && offset < 784) {
85 offset -= 16; offset >>= 2;
86 pt_os_succ_return(regs, *(((unsigned long *)(&t->reg_window[0]))+offset), addr);
89 if(offset >= 784 && offset < 832) {
90 offset -= 784; offset >>= 2;
91 pt_os_succ_return(regs, *(((unsigned long *)(&t->rwbuf_stkptrs[0]))+offset), addr);
111 v = cregs->u_regs[UREG_I0];
114 v = cregs->u_regs[UREG_I1];
117 v = cregs->u_regs[UREG_I2];
120 v = cregs->u_regs[UREG_I3];
123 v = cregs->u_regs[UREG_I4];
126 v = cregs->u_regs[UREG_I5];
129 v = cregs->u_regs[UREG_I6];
132 if(tsk->thread.flags & MAGIC_CONSTANT)
133 v = cregs->u_regs[UREG_G1];
138 v = cregs->u_regs[UREG_I0];
141 v = cregs->u_regs[UREG_I1];
145 /* Isn't binary compatibility _fun_??? */
146 if(cregs->psr & PSR_C)
147 v = cregs->u_regs[UREG_I0] << 24;
152 /* Rest of them are completely unsupported. */
154 printk("%s [%d]: Wants to read user offset %ld\n",
155 current->comm, current->pid, offset);
156 pt_error_return(regs, EIO);
159 if (current->personality == PER_SUNOS)
160 pt_succ_return (regs, v);
162 pt_succ_return_linux (regs, v, addr);
166 static inline void write_sunos_user(struct pt_regs *regs, unsigned long offset,
167 struct task_struct *tsk)
169 struct pt_regs *cregs = tsk->thread.kregs;
170 struct thread_info *t = tsk->thread_info;
171 unsigned long value = regs->u_regs[UREG_I3];
174 offset -= 1024; /* whee... */
175 if(offset & ((sizeof(unsigned long) - 1)))
177 if(offset >= 16 && offset < 784) {
178 offset -= 16; offset >>= 2;
179 *(((unsigned long *)(&t->reg_window[0]))+offset) = value;
182 if(offset >= 784 && offset < 832) {
183 offset -= 784; offset >>= 2;
184 *(((unsigned long *)(&t->rwbuf_stkptrs[0]))+offset) = value;
189 cregs->u_regs[UREG_I0] = value;
192 cregs->u_regs[UREG_I1] = value;
195 cregs->u_regs[UREG_I2] = value;
198 cregs->u_regs[UREG_I3] = value;
201 cregs->u_regs[UREG_I4] = value;
204 cregs->u_regs[UREG_I5] = value;
207 cregs->u_regs[UREG_I6] = value;
210 cregs->u_regs[UREG_I7] = value;
213 cregs->u_regs[UREG_I0] = value;
216 cregs->u_regs[UREG_I1] = value;
219 /* Rest of them are completely unsupported or "no-touch". */
221 printk("%s [%d]: Wants to write user offset %ld\n",
222 current->comm, current->pid, offset);
226 pt_succ_return(regs, 0);
229 pt_error_return(regs, EIO);
233 /* #define ALLOW_INIT_TRACING */
234 /* #define DEBUG_PTRACE */
238 /* 0 */ "TRACEME", "PEEKTEXT", "PEEKDATA", "PEEKUSR",
239 /* 4 */ "POKETEXT", "POKEDATA", "POKEUSR", "CONT",
240 /* 8 */ "KILL", "SINGLESTEP", "SUNATTACH", "SUNDETACH",
241 /* 12 */ "GETREGS", "SETREGS", "GETFPREGS", "SETFPREGS",
242 /* 16 */ "READDATA", "WRITEDATA", "READTEXT", "WRITETEXT",
243 /* 20 */ "GETFPAREGS", "SETFPAREGS", "unknown", "unknown",
244 /* 24 */ "SYSCALL", ""
249 * Called by kernel/ptrace.c when detaching..
251 * Make sure single step bits etc are not set.
253 void ptrace_disable(struct task_struct *child)
258 asmlinkage void do_ptrace(struct pt_regs *regs)
260 unsigned long request = regs->u_regs[UREG_I0];
261 unsigned long pid = regs->u_regs[UREG_I1];
262 unsigned long addr = regs->u_regs[UREG_I2];
263 unsigned long data = regs->u_regs[UREG_I3];
264 unsigned long addr2 = regs->u_regs[UREG_I4];
265 struct task_struct *child;
273 if ((request >= 0) && (request <= 24))
278 if (request == PTRACE_POKEDATA && data == 0x91d02001){
279 printk ("do_ptrace: breakpoint pid=%d, addr=%08lx addr2=%08lx\n",
282 printk("do_ptrace: rq=%s(%d) pid=%d addr=%08lx data=%08lx addr2=%08lx\n",
283 s, (int) request, (int) pid, addr, data, addr2);
286 if(request == PTRACE_TRACEME) {
289 /* are we already being traced? */
290 if (current->ptrace & PT_PTRACED) {
291 pt_error_return(regs, EPERM);
294 ret = security_ptrace(current->parent, current);
296 pt_error_return(regs, -ret);
300 /* set the ptrace bit in the process flags. */
301 current->ptrace |= PT_PTRACED;
302 pt_succ_return(regs, 0);
305 #ifndef ALLOW_INIT_TRACING
307 /* Can't dork with init. */
308 pt_error_return(regs, EPERM);
312 read_lock(&tasklist_lock);
313 child = find_task_by_pid(pid);
315 get_task_struct(child);
316 read_unlock(&tasklist_lock);
319 pt_error_return(regs, ESRCH);
323 if ((current->personality == PER_SUNOS && request == PTRACE_SUNATTACH)
324 || (current->personality != PER_SUNOS && request == PTRACE_ATTACH)) {
325 if (ptrace_attach(child)) {
326 pt_error_return(regs, EPERM);
329 pt_succ_return(regs, 0);
333 ret = ptrace_check_attach(child, request == PTRACE_KILL);
335 pt_error_return(regs, -ret);
340 case PTRACE_PEEKTEXT: /* read word at location addr. */
341 case PTRACE_PEEKDATA: {
344 if (access_process_vm(child, addr,
345 &tmp, sizeof(tmp), 0) == sizeof(tmp))
346 pt_os_succ_return(regs, tmp, (long *)data);
348 pt_error_return(regs, EIO);
353 read_sunos_user(regs, addr, child, (long *) data);
357 write_sunos_user(regs, addr, child);
360 case PTRACE_POKETEXT: /* write the word at location addr. */
361 case PTRACE_POKEDATA: {
362 if (access_process_vm(child, addr,
363 &data, sizeof(data), 1) == sizeof(data))
364 pt_succ_return(regs, 0);
366 pt_error_return(regs, EIO);
370 case PTRACE_GETREGS: {
371 struct pt_regs *pregs = (struct pt_regs *) addr;
372 struct pt_regs *cregs = child->thread.kregs;
375 rval = verify_area(VERIFY_WRITE, pregs, sizeof(struct pt_regs));
377 pt_error_return(regs, -rval);
380 __put_user(cregs->psr, (&pregs->psr));
381 __put_user(cregs->pc, (&pregs->pc));
382 __put_user(cregs->npc, (&pregs->npc));
383 __put_user(cregs->y, (&pregs->y));
384 for(rval = 1; rval < 16; rval++)
385 __put_user(cregs->u_regs[rval], (&pregs->u_regs[rval - 1]));
386 pt_succ_return(regs, 0);
388 printk ("PC=%x nPC=%x o7=%x\n", cregs->pc, cregs->npc, cregs->u_regs [15]);
393 case PTRACE_SETREGS: {
394 struct pt_regs *pregs = (struct pt_regs *) addr;
395 struct pt_regs *cregs = child->thread.kregs;
396 unsigned long psr, pc, npc, y;
399 /* Must be careful, tracing process can only set certain
402 i = verify_area(VERIFY_READ, pregs, sizeof(struct pt_regs));
404 pt_error_return(regs, -i);
407 __get_user(psr, (&pregs->psr));
408 __get_user(pc, (&pregs->pc));
409 __get_user(npc, (&pregs->npc));
410 __get_user(y, (&pregs->y));
412 cregs->psr &= ~PSR_ICC;
414 if(!((pc | npc) & 3)) {
419 for(i = 1; i < 16; i++)
420 __get_user(cregs->u_regs[i], (&pregs->u_regs[i-1]));
421 pt_succ_return(regs, 0);
425 case PTRACE_GETFPREGS: {
427 unsigned long regs[32];
433 unsigned long *insnaddr;
436 } *fps = (struct fps *) addr;
439 i = verify_area(VERIFY_WRITE, fps, sizeof(struct fps));
441 pt_error_return(regs, -i);
444 for(i = 0; i < 32; i++)
445 __put_user(child->thread.float_regs[i], (&fps->regs[i]));
446 __put_user(child->thread.fsr, (&fps->fsr));
447 __put_user(child->thread.fpqdepth, (&fps->fpqd));
448 __put_user(0, (&fps->flags));
449 __put_user(0, (&fps->extra));
450 for(i = 0; i < 16; i++) {
451 __put_user(child->thread.fpqueue[i].insn_addr,
452 (&fps->fpq[i].insnaddr));
453 __put_user(child->thread.fpqueue[i].insn, (&fps->fpq[i].insn));
455 pt_succ_return(regs, 0);
459 case PTRACE_SETFPREGS: {
461 unsigned long regs[32];
467 unsigned long *insnaddr;
470 } *fps = (struct fps *) addr;
473 i = verify_area(VERIFY_READ, fps, sizeof(struct fps));
475 pt_error_return(regs, -i);
478 copy_from_user(&child->thread.float_regs[0], &fps->regs[0], (32 * sizeof(unsigned long)));
479 __get_user(child->thread.fsr, (&fps->fsr));
480 __get_user(child->thread.fpqdepth, (&fps->fpqd));
481 for(i = 0; i < 16; i++) {
482 __get_user(child->thread.fpqueue[i].insn_addr,
483 (&fps->fpq[i].insnaddr));
484 __get_user(child->thread.fpqueue[i].insn, (&fps->fpq[i].insn));
486 pt_succ_return(regs, 0);
490 case PTRACE_READTEXT:
491 case PTRACE_READDATA: {
492 int res = ptrace_readdata(child, addr, (void *) addr2, data);
495 pt_succ_return(regs, 0);
498 /* Partial read is an IO failure */
501 pt_error_return(regs, -res);
505 case PTRACE_WRITETEXT:
506 case PTRACE_WRITEDATA: {
507 int res = ptrace_writedata(child, (void *) addr2, addr, data);
510 pt_succ_return(regs, 0);
513 /* Partial write is an IO failure */
516 pt_error_return(regs, -res);
520 case PTRACE_SYSCALL: /* continue and stop at (return from) syscall */
523 case PTRACE_CONT: { /* restart after signal. */
525 pt_error_return(regs, EIO);
530 pt_error_return(regs, EINVAL);
534 printk ("Original: %08lx %08lx\n", child->thread.kregs->pc, child->thread.kregs->npc);
535 printk ("Continuing with %08lx %08lx\n", addr, addr+4);
537 child->thread.kregs->pc = addr;
538 child->thread.kregs->npc = addr + 4;
541 if (request == PTRACE_SYSCALL)
542 set_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
544 clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
546 child->exit_code = data;
548 printk("CONT: %s [%d]: set exit_code = %x %lx %lx\n",
549 child->comm, child->pid, child->exit_code,
550 child->thread.kregs->pc,
551 child->thread.kregs->npc);
553 wake_up_process(child);
554 pt_succ_return(regs, 0);
559 * make the child exit. Best I can do is send it a sigkill.
560 * perhaps it should be put in the status that it wants to
564 if (child->state == TASK_ZOMBIE) { /* already dead */
565 pt_succ_return(regs, 0);
568 wake_up_process(child);
569 child->exit_code = SIGKILL;
570 pt_succ_return(regs, 0);
574 case PTRACE_SUNDETACH: { /* detach a process that was attached. */
575 int err = ptrace_detach(child, data);
577 pt_error_return(regs, EIO);
580 pt_succ_return(regs, 0);
584 /* PTRACE_DUMPCORE unsupported... */
587 int err = ptrace_request(child, request, addr, data);
589 pt_error_return(regs, -err);
591 pt_succ_return(regs, 0);
597 put_task_struct(child);
602 asmlinkage void syscall_trace(void)
605 printk("%s [%d]: syscall_trace\n", current->comm, current->pid);
607 if (!test_thread_flag(TIF_SYSCALL_TRACE))
609 if (!(current->ptrace & PT_PTRACED))
611 current->exit_code = SIGTRAP | ((current->ptrace & PT_TRACESYSGOOD)
613 current->state = TASK_STOPPED;
614 current->thread.flags ^= MAGIC_CONSTANT;
615 notify_parent(current, SIGCHLD);
618 * this isn't the same as continuing with a signal, but it will do
619 * for normal use. strace only continues with a signal if the
620 * stopping signal is not SIGTRAP. -brl
623 printk("%s [%d]: syscall_trace exit= %x\n", current->comm,
624 current->pid, current->exit_code);
626 if (current->exit_code) {
627 send_sig (current->exit_code, current, 1);
628 current->exit_code = 0;