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>
22 #include <linux/vs_base.h>
24 #include <asm/pgtable.h>
25 #include <asm/system.h>
26 #include <asm/uaccess.h>
28 #define MAGIC_CONSTANT 0x80000000
31 /* Returning from ptrace is a bit tricky because the syscall return
32 * low level code assumes any value returned which is negative and
33 * is a valid errno will mean setting the condition codes to indicate
34 * an error return. This doesn't work, so we have this hook.
36 static inline void pt_error_return(struct pt_regs *regs, unsigned long error)
38 regs->u_regs[UREG_I0] = error;
44 static inline void pt_succ_return(struct pt_regs *regs, unsigned long value)
46 regs->u_regs[UREG_I0] = value;
53 pt_succ_return_linux(struct pt_regs *regs, unsigned long value, long __user *addr)
55 if (put_user(value, addr)) {
56 pt_error_return(regs, EFAULT);
59 regs->u_regs[UREG_I0] = 0;
66 pt_os_succ_return (struct pt_regs *regs, unsigned long val, long __user *addr)
68 if (current->personality == PER_SUNOS)
69 pt_succ_return (regs, val);
71 pt_succ_return_linux (regs, val, addr);
74 /* Fuck me gently with a chainsaw... */
75 static inline void read_sunos_user(struct pt_regs *regs, unsigned long offset,
76 struct task_struct *tsk, long __user *addr)
78 struct pt_regs *cregs = tsk->thread.kregs;
79 struct thread_info *t = task_thread_info(tsk);
83 offset -= 1024; /* whee... */
84 if(offset & ((sizeof(unsigned long) - 1))) {
85 pt_error_return(regs, EIO);
88 if(offset >= 16 && offset < 784) {
89 offset -= 16; offset >>= 2;
90 pt_os_succ_return(regs, *(((unsigned long *)(&t->reg_window[0]))+offset), addr);
93 if(offset >= 784 && offset < 832) {
94 offset -= 784; offset >>= 2;
95 pt_os_succ_return(regs, *(((unsigned long *)(&t->rwbuf_stkptrs[0]))+offset), addr);
115 v = cregs->u_regs[UREG_I0];
118 v = cregs->u_regs[UREG_I1];
121 v = cregs->u_regs[UREG_I2];
124 v = cregs->u_regs[UREG_I3];
127 v = cregs->u_regs[UREG_I4];
130 v = cregs->u_regs[UREG_I5];
133 v = cregs->u_regs[UREG_I6];
136 if(tsk->thread.flags & MAGIC_CONSTANT)
137 v = cregs->u_regs[UREG_G1];
142 v = cregs->u_regs[UREG_I0];
145 v = cregs->u_regs[UREG_I1];
149 /* Isn't binary compatibility _fun_??? */
150 if(cregs->psr & PSR_C)
151 v = cregs->u_regs[UREG_I0] << 24;
156 /* Rest of them are completely unsupported. */
158 printk("%s [%d]: Wants to read user offset %ld\n",
159 current->comm, current->pid, offset);
160 pt_error_return(regs, EIO);
163 if (current->personality == PER_SUNOS)
164 pt_succ_return (regs, v);
166 pt_succ_return_linux (regs, v, addr);
170 static inline void write_sunos_user(struct pt_regs *regs, unsigned long offset,
171 struct task_struct *tsk)
173 struct pt_regs *cregs = tsk->thread.kregs;
174 struct thread_info *t = task_thread_info(tsk);
175 unsigned long value = regs->u_regs[UREG_I3];
178 offset -= 1024; /* whee... */
179 if(offset & ((sizeof(unsigned long) - 1)))
181 if(offset >= 16 && offset < 784) {
182 offset -= 16; offset >>= 2;
183 *(((unsigned long *)(&t->reg_window[0]))+offset) = value;
186 if(offset >= 784 && offset < 832) {
187 offset -= 784; offset >>= 2;
188 *(((unsigned long *)(&t->rwbuf_stkptrs[0]))+offset) = value;
193 cregs->u_regs[UREG_I0] = value;
196 cregs->u_regs[UREG_I1] = value;
199 cregs->u_regs[UREG_I2] = value;
202 cregs->u_regs[UREG_I3] = value;
205 cregs->u_regs[UREG_I4] = value;
208 cregs->u_regs[UREG_I5] = value;
211 cregs->u_regs[UREG_I6] = value;
214 cregs->u_regs[UREG_I7] = value;
217 cregs->u_regs[UREG_I0] = value;
220 cregs->u_regs[UREG_I1] = value;
223 /* Rest of them are completely unsupported or "no-touch". */
225 printk("%s [%d]: Wants to write user offset %ld\n",
226 current->comm, current->pid, offset);
230 pt_succ_return(regs, 0);
233 pt_error_return(regs, EIO);
237 /* #define ALLOW_INIT_TRACING */
238 /* #define DEBUG_PTRACE */
242 /* 0 */ "TRACEME", "PEEKTEXT", "PEEKDATA", "PEEKUSR",
243 /* 4 */ "POKETEXT", "POKEDATA", "POKEUSR", "CONT",
244 /* 8 */ "KILL", "SINGLESTEP", "SUNATTACH", "SUNDETACH",
245 /* 12 */ "GETREGS", "SETREGS", "GETFPREGS", "SETFPREGS",
246 /* 16 */ "READDATA", "WRITEDATA", "READTEXT", "WRITETEXT",
247 /* 20 */ "GETFPAREGS", "SETFPAREGS", "unknown", "unknown",
248 /* 24 */ "SYSCALL", ""
253 * Called by kernel/ptrace.c when detaching..
255 * Make sure single step bits etc are not set.
257 void ptrace_disable(struct task_struct *child)
262 asmlinkage void do_ptrace(struct pt_regs *regs)
264 unsigned long request = regs->u_regs[UREG_I0];
265 unsigned long pid = regs->u_regs[UREG_I1];
266 unsigned long addr = regs->u_regs[UREG_I2];
267 unsigned long data = regs->u_regs[UREG_I3];
268 unsigned long addr2 = regs->u_regs[UREG_I4];
269 struct task_struct *child;
277 if ((request >= 0) && (request <= 24))
282 if (request == PTRACE_POKEDATA && data == 0x91d02001){
283 printk ("do_ptrace: breakpoint pid=%d, addr=%08lx addr2=%08lx\n",
286 printk("do_ptrace: rq=%s(%d) pid=%d addr=%08lx data=%08lx addr2=%08lx\n",
287 s, (int) request, (int) pid, addr, data, addr2);
291 if (request == PTRACE_TRACEME) {
292 ret = ptrace_traceme();
294 pt_error_return(regs, -ret);
296 pt_succ_return(regs, 0);
300 child = ptrace_get_task_struct(pid);
302 ret = PTR_ERR(child);
303 pt_error_return(regs, -ret);
306 if (!vx_check(vx_task_xid(child), VS_WATCH_P|VS_IDENT)) {
307 pt_error_return(regs, ESRCH);
311 if ((current->personality == PER_SUNOS && request == PTRACE_SUNATTACH)
312 || (current->personality != PER_SUNOS && request == PTRACE_ATTACH)) {
313 if (ptrace_attach(child)) {
314 pt_error_return(regs, EPERM);
317 pt_succ_return(regs, 0);
321 ret = ptrace_check_attach(child, request == PTRACE_KILL);
323 pt_error_return(regs, -ret);
328 case PTRACE_PEEKTEXT: /* read word at location addr. */
329 case PTRACE_PEEKDATA: {
332 if (access_process_vm(child, addr,
333 &tmp, sizeof(tmp), 0) == sizeof(tmp))
334 pt_os_succ_return(regs, tmp, (long __user *)data);
336 pt_error_return(regs, EIO);
341 read_sunos_user(regs, addr, child, (long __user *) data);
345 write_sunos_user(regs, addr, child);
348 case PTRACE_POKETEXT: /* write the word at location addr. */
349 case PTRACE_POKEDATA: {
350 if (access_process_vm(child, addr,
351 &data, sizeof(data), 1) == sizeof(data))
352 pt_succ_return(regs, 0);
354 pt_error_return(regs, EIO);
358 case PTRACE_GETREGS: {
359 struct pt_regs __user *pregs = (struct pt_regs __user *) addr;
360 struct pt_regs *cregs = child->thread.kregs;
363 if (!access_ok(VERIFY_WRITE, pregs, sizeof(struct pt_regs))) {
365 pt_error_return(regs, -rval);
368 __put_user(cregs->psr, (&pregs->psr));
369 __put_user(cregs->pc, (&pregs->pc));
370 __put_user(cregs->npc, (&pregs->npc));
371 __put_user(cregs->y, (&pregs->y));
372 for(rval = 1; rval < 16; rval++)
373 __put_user(cregs->u_regs[rval], (&pregs->u_regs[rval - 1]));
374 pt_succ_return(regs, 0);
376 printk ("PC=%x nPC=%x o7=%x\n", cregs->pc, cregs->npc, cregs->u_regs [15]);
381 case PTRACE_SETREGS: {
382 struct pt_regs __user *pregs = (struct pt_regs __user *) addr;
383 struct pt_regs *cregs = child->thread.kregs;
384 unsigned long psr, pc, npc, y;
387 /* Must be careful, tracing process can only set certain
390 if (!access_ok(VERIFY_READ, pregs, sizeof(struct pt_regs))) {
391 pt_error_return(regs, EFAULT);
394 __get_user(psr, (&pregs->psr));
395 __get_user(pc, (&pregs->pc));
396 __get_user(npc, (&pregs->npc));
397 __get_user(y, (&pregs->y));
399 cregs->psr &= ~PSR_ICC;
401 if (!((pc | npc) & 3)) {
406 for(i = 1; i < 16; i++)
407 __get_user(cregs->u_regs[i], (&pregs->u_regs[i-1]));
408 pt_succ_return(regs, 0);
412 case PTRACE_GETFPREGS: {
414 unsigned long regs[32];
420 unsigned long *insnaddr;
424 struct fps __user *fps = (struct fps __user *) addr;
427 if (!access_ok(VERIFY_WRITE, fps, sizeof(struct fps))) {
429 pt_error_return(regs, -i);
432 for(i = 0; i < 32; i++)
433 __put_user(child->thread.float_regs[i], (&fps->regs[i]));
434 __put_user(child->thread.fsr, (&fps->fsr));
435 __put_user(child->thread.fpqdepth, (&fps->fpqd));
436 __put_user(0, (&fps->flags));
437 __put_user(0, (&fps->extra));
438 for(i = 0; i < 16; i++) {
439 __put_user(child->thread.fpqueue[i].insn_addr,
440 (&fps->fpq[i].insnaddr));
441 __put_user(child->thread.fpqueue[i].insn, (&fps->fpq[i].insn));
443 pt_succ_return(regs, 0);
447 case PTRACE_SETFPREGS: {
449 unsigned long regs[32];
455 unsigned long *insnaddr;
459 struct fps __user *fps = (struct fps __user *) addr;
462 if (!access_ok(VERIFY_READ, fps, sizeof(struct fps))) {
464 pt_error_return(regs, -i);
467 copy_from_user(&child->thread.float_regs[0], &fps->regs[0], (32 * sizeof(unsigned long)));
468 __get_user(child->thread.fsr, (&fps->fsr));
469 __get_user(child->thread.fpqdepth, (&fps->fpqd));
470 for(i = 0; i < 16; i++) {
471 __get_user(child->thread.fpqueue[i].insn_addr,
472 (&fps->fpq[i].insnaddr));
473 __get_user(child->thread.fpqueue[i].insn, (&fps->fpq[i].insn));
475 pt_succ_return(regs, 0);
479 case PTRACE_READTEXT:
480 case PTRACE_READDATA: {
481 int res = ptrace_readdata(child, addr,
482 (void __user *) addr2, data);
485 pt_succ_return(regs, 0);
488 /* Partial read is an IO failure */
491 pt_error_return(regs, -res);
495 case PTRACE_WRITETEXT:
496 case PTRACE_WRITEDATA: {
497 int res = ptrace_writedata(child, (void __user *) addr2,
501 pt_succ_return(regs, 0);
504 /* Partial write is an IO failure */
507 pt_error_return(regs, -res);
511 case PTRACE_SYSCALL: /* continue and stop at (return from) syscall */
514 case PTRACE_CONT: { /* restart after signal. */
515 if (!valid_signal(data)) {
516 pt_error_return(regs, EIO);
520 if (request == PTRACE_SYSCALL)
521 set_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
523 clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
525 child->exit_code = data;
527 printk("CONT: %s [%d]: set exit_code = %x %lx %lx\n",
528 child->comm, child->pid, child->exit_code,
529 child->thread.kregs->pc,
530 child->thread.kregs->npc);
532 wake_up_process(child);
533 pt_succ_return(regs, 0);
538 * make the child exit. Best I can do is send it a sigkill.
539 * perhaps it should be put in the status that it wants to
543 if (child->exit_state == EXIT_ZOMBIE) { /* already dead */
544 pt_succ_return(regs, 0);
547 wake_up_process(child);
548 child->exit_code = SIGKILL;
549 pt_succ_return(regs, 0);
553 case PTRACE_SUNDETACH: { /* detach a process that was attached. */
554 int err = ptrace_detach(child, data);
556 pt_error_return(regs, EIO);
559 pt_succ_return(regs, 0);
563 /* PTRACE_DUMPCORE unsupported... */
566 int err = ptrace_request(child, request, addr, data);
568 pt_error_return(regs, -err);
570 pt_succ_return(regs, 0);
576 put_task_struct(child);
581 asmlinkage void syscall_trace(void)
584 printk("%s [%d]: syscall_trace\n", current->comm, current->pid);
586 if (!test_thread_flag(TIF_SYSCALL_TRACE))
588 if (!(current->ptrace & PT_PTRACED))
590 current->thread.flags ^= MAGIC_CONSTANT;
591 ptrace_notify(SIGTRAP | ((current->ptrace & PT_TRACESYSGOOD)
594 * this isn't the same as continuing with a signal, but it will do
595 * for normal use. strace only continues with a signal if the
596 * stopping signal is not SIGTRAP. -brl
599 printk("%s [%d]: syscall_trace exit= %x\n", current->comm,
600 current->pid, current->exit_code);
602 if (current->exit_code) {
603 send_sig (current->exit_code, current, 1);
604 current->exit_code = 0;