Merge master.kernel.org:/pub/scm/linux/kernel/git/davem/sparc-2.6
[linux-2.6] / arch / sparc64 / kernel / ptrace.c
1 /* ptrace.c: Sparc process tracing support.
2  *
3  * Copyright (C) 1996 David S. Miller (davem@caipfs.rutgers.edu)
4  * Copyright (C) 1997 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
5  *
6  * Based upon code written by Ross Biro, Linus Torvalds, Bob Manson,
7  * and David Mosberger.
8  *
9  * Added Linux support -miguel (weird, eh?, the original code was meant
10  * to emulate SunOS).
11  */
12
13 #include <linux/kernel.h>
14 #include <linux/sched.h>
15 #include <linux/mm.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>
25
26 #include <asm/asi.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>
33 #include <asm/page.h>
34 #include <asm/cpudata.h>
35
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.
40  */
41 static inline void pt_error_return(struct pt_regs *regs, unsigned long error)
42 {
43         regs->u_regs[UREG_I0] = error;
44         regs->tstate |= (TSTATE_ICARRY | TSTATE_XCARRY);
45         regs->tpc = regs->tnpc;
46         regs->tnpc += 4;
47 }
48
49 static inline void pt_succ_return(struct pt_regs *regs, unsigned long value)
50 {
51         regs->u_regs[UREG_I0] = value;
52         regs->tstate &= ~(TSTATE_ICARRY | TSTATE_XCARRY);
53         regs->tpc = regs->tnpc;
54         regs->tnpc += 4;
55 }
56
57 static inline void
58 pt_succ_return_linux(struct pt_regs *regs, unsigned long value, void __user *addr)
59 {
60         if (test_thread_flag(TIF_32BIT)) {
61                 if (put_user(value, (unsigned int __user *) addr)) {
62                         pt_error_return(regs, EFAULT);
63                         return;
64                 }
65         } else {
66                 if (put_user(value, (long __user *) addr)) {
67                         pt_error_return(regs, EFAULT);
68                         return;
69                 }
70         }
71         regs->u_regs[UREG_I0] = 0;
72         regs->tstate &= ~(TSTATE_ICARRY | TSTATE_XCARRY);
73         regs->tpc = regs->tnpc;
74         regs->tnpc += 4;
75 }
76
77 static void
78 pt_os_succ_return (struct pt_regs *regs, unsigned long val, void __user *addr)
79 {
80         if (current->personality == PER_SUNOS)
81                 pt_succ_return (regs, val);
82         else
83                 pt_succ_return_linux (regs, val, addr);
84 }
85
86 /* #define ALLOW_INIT_TRACING */
87 /* #define DEBUG_PTRACE */
88
89 #ifdef DEBUG_PTRACE
90 char *pt_rq [] = {
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", ""
98 };
99 #endif
100
101 /*
102  * Called by kernel/ptrace.c when detaching..
103  *
104  * Make sure single step bits etc are not set.
105  */
106 void ptrace_disable(struct task_struct *child)
107 {
108         /* nothing to do */
109 }
110
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.
115  *
116  * Now, the only thing we have to do is:
117  * 1) flush the D-cache if it's possible than an illegal alias
118  *    has been created
119  * 2) flush the I-cache if this is pre-cheetah and we did a write
120  */
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)
124 {
125         BUG_ON(len > PAGE_SIZE);
126
127         if (tlb_type == hypervisor)
128                 return;
129
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
134          * D-cache flush.
135          */
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;
140
141                 dcache_line_size = local_cpu_data().dcache_line_size;
142
143                 if (tlb_type == spitfire) {
144                         for (; start < end; start += dcache_line_size)
145                                 spitfire_put_dcache_tag(start & 0x3fe0, 0x0);
146                 } else {
147                         start &= ~(dcache_line_size - 1);
148                         for (; start < end; start += dcache_line_size)
149                                 __asm__ __volatile__(
150                                         "stxa %%g0, [%0] %1\n\t"
151                                         "membar #Sync"
152                                         : /* no outputs */
153                                         : "r" (start),
154                                         "i" (ASI_DCACHE_INVALIDATE));
155                 }
156         }
157 #endif
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;
162
163                 icache_line_size = local_cpu_data().icache_line_size;
164
165                 for (; start < end; start += icache_line_size)
166                         flushi(start);
167         }
168 }
169
170 asmlinkage void do_ptrace(struct pt_regs *regs)
171 {
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;
178         int ret;
179
180         if (test_thread_flag(TIF_32BIT)) {
181                 addr &= 0xffffffffUL;
182                 data &= 0xffffffffUL;
183                 addr2 &= 0xffffffffUL;
184         }
185         lock_kernel();
186 #ifdef DEBUG_PTRACE
187         {
188                 char *s;
189
190                 if ((request >= 0) && (request <= 24))
191                         s = pt_rq [request];
192                 else
193                         s = "unknown";
194
195                 if (request == PTRACE_POKEDATA && data == 0x91d02001){
196                         printk ("do_ptrace: breakpoint pid=%d, addr=%016lx addr2=%016lx\n",
197                                 pid, addr, addr2);
198                 } else 
199                         printk("do_ptrace: rq=%s(%d) pid=%d addr=%016lx data=%016lx addr2=%016lx\n",
200                                s, request, pid, addr, data, addr2);
201         }
202 #endif
203         if (request == PTRACE_TRACEME) {
204                 ret = ptrace_traceme();
205                 if (ret < 0)
206                         pt_error_return(regs, -ret);
207                 else
208                         pt_succ_return(regs, 0);
209                 goto out;
210         }
211
212         child = ptrace_get_task_struct(pid);
213         if (IS_ERR(child)) {
214                 ret = PTR_ERR(child);
215                 pt_error_return(regs, -ret);
216                 goto out;
217         }
218
219         if ((current->personality == PER_SUNOS && request == PTRACE_SUNATTACH)
220             || (current->personality != PER_SUNOS && request == PTRACE_ATTACH)) {
221                 if (ptrace_attach(child)) {
222                         pt_error_return(regs, EPERM);
223                         goto out_tsk;
224                 }
225                 pt_succ_return(regs, 0);
226                 goto out_tsk;
227         }
228
229         ret = ptrace_check_attach(child, request == PTRACE_KILL);
230         if (ret < 0) {
231                 pt_error_return(regs, -ret);
232                 goto out_tsk;
233         }
234
235         if (!(test_thread_flag(TIF_32BIT))      &&
236             ((request == PTRACE_READDATA64)             ||
237              (request == PTRACE_WRITEDATA64)            ||
238              (request == PTRACE_READTEXT64)             ||
239              (request == PTRACE_WRITETEXT64)            ||
240              (request == PTRACE_PEEKTEXT64)             ||
241              (request == PTRACE_POKETEXT64)             ||
242              (request == PTRACE_PEEKDATA64)             ||
243              (request == PTRACE_POKEDATA64))) {
244                 addr = regs->u_regs[UREG_G2];
245                 addr2 = regs->u_regs[UREG_G3];
246                 request -= 30; /* wheee... */
247         }
248
249         switch(request) {
250         case PTRACE_PEEKUSR:
251                 if (addr != 0)
252                         pt_error_return(regs, EIO);
253                 else
254                         pt_succ_return(regs, 0);
255                 goto out_tsk;
256
257         case PTRACE_PEEKTEXT: /* read word at location addr. */ 
258         case PTRACE_PEEKDATA: {
259                 unsigned long tmp64;
260                 unsigned int tmp32;
261                 int res, copied;
262
263                 res = -EIO;
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))
269                                 res = 0;
270                 } else {
271                         copied = access_process_vm(child, addr,
272                                                    &tmp64, sizeof(tmp64), 0);
273                         if (copied == sizeof(tmp64))
274                                 res = 0;
275                 }
276                 if (res < 0)
277                         pt_error_return(regs, -res);
278                 else
279                         pt_os_succ_return(regs, tmp64, (void __user *) data);
280                 goto out_tsk;
281         }
282
283         case PTRACE_POKETEXT: /* write the word at location addr. */
284         case PTRACE_POKEDATA: {
285                 unsigned long tmp64;
286                 unsigned int tmp32;
287                 int copied, res = -EIO;
288
289                 if (test_thread_flag(TIF_32BIT)) {
290                         tmp32 = data;
291                         copied = access_process_vm(child, addr,
292                                                    &tmp32, sizeof(tmp32), 1);
293                         if (copied == sizeof(tmp32))
294                                 res = 0;
295                 } else {
296                         tmp64 = data;
297                         copied = access_process_vm(child, addr,
298                                                    &tmp64, sizeof(tmp64), 1);
299                         if (copied == sizeof(tmp64))
300                                 res = 0;
301                 }
302                 if (res < 0)
303                         pt_error_return(regs, -res);
304                 else
305                         pt_succ_return(regs, res);
306                 goto out_tsk;
307         }
308
309         case PTRACE_GETREGS: {
310                 struct pt_regs32 __user *pregs =
311                         (struct pt_regs32 __user *) addr;
312                 struct pt_regs *cregs = task_pt_regs(child);
313                 int rval;
314
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);
320                         goto out_tsk;
321                 }
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);
325                                 goto out_tsk;
326                         }
327                 pt_succ_return(regs, 0);
328 #ifdef DEBUG_PTRACE
329                 printk ("PC=%lx nPC=%lx o7=%lx\n", cregs->tpc, cregs->tnpc, cregs->u_regs [15]);
330 #endif
331                 goto out_tsk;
332         }
333
334         case PTRACE_GETREGS64: {
335                 struct pt_regs __user *pregs = (struct pt_regs __user *) addr;
336                 struct pt_regs *cregs = task_pt_regs(child);
337                 unsigned long tpc = cregs->tpc;
338                 int rval;
339
340                 if ((task_thread_info(child)->flags & _TIF_32BIT) != 0)
341                         tpc &= 0xffffffff;
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);
347                         goto out_tsk;
348                 }
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);
352                                 goto out_tsk;
353                         }
354                 pt_succ_return(regs, 0);
355 #ifdef DEBUG_PTRACE
356                 printk ("PC=%lx nPC=%lx o7=%lx\n", cregs->tpc, cregs->tnpc, cregs->u_regs [15]);
357 #endif
358                 goto out_tsk;
359         }
360
361         case PTRACE_SETREGS: {
362                 struct pt_regs32 __user *pregs =
363                         (struct pt_regs32 __user *) addr;
364                 struct pt_regs *cregs = task_pt_regs(child);
365                 unsigned int psr, pc, npc, y;
366                 int i;
367
368                 /* Must be careful, tracing process can only set certain
369                  * bits in the psr.
370                  */
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);
376                         goto out_tsk;
377                 }
378                 cregs->tstate &= ~(TSTATE_ICC);
379                 cregs->tstate |= psr_to_tstate_icc(psr);
380                 if (!((pc | npc) & 3)) {
381                         cregs->tpc = pc;
382                         cregs->tnpc = npc;
383                 }
384                 cregs->y = y;
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);
388                                 goto out_tsk;
389                         }
390                 }
391                 pt_succ_return(regs, 0);
392                 goto out_tsk;
393         }
394
395         case PTRACE_SETREGS64: {
396                 struct pt_regs __user *pregs = (struct pt_regs __user *) addr;
397                 struct pt_regs *cregs = task_pt_regs(child);
398                 unsigned long tstate, tpc, tnpc, y;
399                 int i;
400
401                 /* Must be careful, tracing process can only set certain
402                  * bits in the psr.
403                  */
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);
409                         goto out_tsk;
410                 }
411                 if ((task_thread_info(child)->flags & _TIF_32BIT) != 0) {
412                         tpc &= 0xffffffff;
413                         tnpc &= 0xffffffff;
414                 }
415                 tstate &= (TSTATE_ICC | TSTATE_XCC);
416                 cregs->tstate &= ~(TSTATE_ICC | TSTATE_XCC);
417                 cregs->tstate |= tstate;
418                 if (!((tpc | tnpc) & 3)) {
419                         cregs->tpc = tpc;
420                         cregs->tnpc = tnpc;
421                 }
422                 cregs->y = y;
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);
426                                 goto out_tsk;
427                         }
428                 }
429                 pt_succ_return(regs, 0);
430                 goto out_tsk;
431         }
432
433         case PTRACE_GETFPREGS: {
434                 struct fps {
435                         unsigned int regs[32];
436                         unsigned int fsr;
437                         unsigned int flags;
438                         unsigned int extra;
439                         unsigned int fpqd;
440                         struct fq {
441                                 unsigned int insnaddr;
442                                 unsigned int insn;
443                         } fpq[16];
444                 };
445                 struct fps __user *fps = (struct fps __user *) addr;
446                 unsigned long *fpregs = task_thread_info(child)->fpregs;
447
448                 if (copy_to_user(&fps->regs[0], fpregs,
449                                  (32 * sizeof(unsigned int))) ||
450                     __put_user(task_thread_info(child)->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);
456                         goto out_tsk;
457                 }
458                 pt_succ_return(regs, 0);
459                 goto out_tsk;
460         }
461
462         case PTRACE_GETFPREGS64: {
463                 struct fps {
464                         unsigned int regs[64];
465                         unsigned long fsr;
466                 };
467                 struct fps __user *fps = (struct fps __user *) addr;
468                 unsigned long *fpregs = task_thread_info(child)->fpregs;
469
470                 if (copy_to_user(&fps->regs[0], fpregs,
471                                  (64 * sizeof(unsigned int))) ||
472                     __put_user(task_thread_info(child)->xfsr[0], (&fps->fsr))) {
473                         pt_error_return(regs, EFAULT);
474                         goto out_tsk;
475                 }
476                 pt_succ_return(regs, 0);
477                 goto out_tsk;
478         }
479
480         case PTRACE_SETFPREGS: {
481                 struct fps {
482                         unsigned int regs[32];
483                         unsigned int fsr;
484                         unsigned int flags;
485                         unsigned int extra;
486                         unsigned int fpqd;
487                         struct fq {
488                                 unsigned int insnaddr;
489                                 unsigned int insn;
490                         } fpq[16];
491                 };
492                 struct fps __user *fps = (struct fps __user *) addr;
493                 unsigned long *fpregs = task_thread_info(child)->fpregs;
494                 unsigned fsr;
495
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);
500                         goto out_tsk;
501                 }
502                 task_thread_info(child)->xfsr[0] &= 0xffffffff00000000UL;
503                 task_thread_info(child)->xfsr[0] |= fsr;
504                 if (!(task_thread_info(child)->fpsaved[0] & FPRS_FEF))
505                         task_thread_info(child)->gsr[0] = 0;
506                 task_thread_info(child)->fpsaved[0] |= (FPRS_FEF | FPRS_DL);
507                 pt_succ_return(regs, 0);
508                 goto out_tsk;
509         }
510
511         case PTRACE_SETFPREGS64: {
512                 struct fps {
513                         unsigned int regs[64];
514                         unsigned long fsr;
515                 };
516                 struct fps __user *fps = (struct fps __user *) addr;
517                 unsigned long *fpregs = task_thread_info(child)->fpregs;
518
519                 if (copy_from_user(fpregs, &fps->regs[0],
520                                    (64 * sizeof(unsigned int))) ||
521                     __get_user(task_thread_info(child)->xfsr[0], (&fps->fsr))) {
522                         pt_error_return(regs, EFAULT);
523                         goto out_tsk;
524                 }
525                 if (!(task_thread_info(child)->fpsaved[0] & FPRS_FEF))
526                         task_thread_info(child)->gsr[0] = 0;
527                 task_thread_info(child)->fpsaved[0] |= (FPRS_FEF | FPRS_DL | FPRS_DU);
528                 pt_succ_return(regs, 0);
529                 goto out_tsk;
530         }
531
532         case PTRACE_READTEXT:
533         case PTRACE_READDATA: {
534                 int res = ptrace_readdata(child, addr,
535                                           (char __user *)addr2, data);
536                 if (res == data) {
537                         pt_succ_return(regs, 0);
538                         goto out_tsk;
539                 }
540                 if (res >= 0)
541                         res = -EIO;
542                 pt_error_return(regs, -res);
543                 goto out_tsk;
544         }
545
546         case PTRACE_WRITETEXT:
547         case PTRACE_WRITEDATA: {
548                 int res = ptrace_writedata(child, (char __user *) addr2,
549                                            addr, data);
550                 if (res == data) {
551                         pt_succ_return(regs, 0);
552                         goto out_tsk;
553                 }
554                 if (res >= 0)
555                         res = -EIO;
556                 pt_error_return(regs, -res);
557                 goto out_tsk;
558         }
559         case PTRACE_SYSCALL: /* continue and stop at (return from) syscall */
560                 addr = 1;
561
562         case PTRACE_CONT: { /* restart after signal. */
563                 if (!valid_signal(data)) {
564                         pt_error_return(regs, EIO);
565                         goto out_tsk;
566                 }
567
568                 if (request == PTRACE_SYSCALL) {
569                         set_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
570                 } else {
571                         clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
572                 }
573
574                 child->exit_code = data;
575 #ifdef DEBUG_PTRACE
576                 printk("CONT: %s [%d]: set exit_code = %x %lx %lx\n", child->comm,
577                         child->pid, child->exit_code,
578                         task_pt_regs(child)->tpc,
579                         task_pt_regs(child)->tnpc);
580                        
581 #endif
582                 wake_up_process(child);
583                 pt_succ_return(regs, 0);
584                 goto out_tsk;
585         }
586
587 /*
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 
590  * exit.
591  */
592         case PTRACE_KILL: {
593                 if (child->exit_state == EXIT_ZOMBIE) { /* already dead */
594                         pt_succ_return(regs, 0);
595                         goto out_tsk;
596                 }
597                 child->exit_code = SIGKILL;
598                 wake_up_process(child);
599                 pt_succ_return(regs, 0);
600                 goto out_tsk;
601         }
602
603         case PTRACE_SUNDETACH: { /* detach a process that was attached. */
604                 int error = ptrace_detach(child, data);
605                 if (error) {
606                         pt_error_return(regs, EIO);
607                         goto out_tsk;
608                 }
609                 pt_succ_return(regs, 0);
610                 goto out_tsk;
611         }
612
613         /* PTRACE_DUMPCORE unsupported... */
614
615         case PTRACE_GETEVENTMSG: {
616                 int err;
617
618                 if (test_thread_flag(TIF_32BIT))
619                         err = put_user(child->ptrace_message,
620                                        (unsigned int __user *) data);
621                 else
622                         err = put_user(child->ptrace_message,
623                                        (unsigned long __user *) data);
624                 if (err)
625                         pt_error_return(regs, -err);
626                 else
627                         pt_succ_return(regs, 0);
628                 break;
629         }
630
631         default: {
632                 int err = ptrace_request(child, request, addr, data);
633                 if (err)
634                         pt_error_return(regs, -err);
635                 else
636                         pt_succ_return(regs, 0);
637                 goto out_tsk;
638         }
639         }
640 out_tsk:
641         if (child)
642                 put_task_struct(child);
643 out:
644         unlock_kernel();
645 }
646
647 asmlinkage void syscall_trace(struct pt_regs *regs, int syscall_exit_p)
648 {
649         /* do the secure computing check first */
650         secure_computing(regs->u_regs[UREG_G1]);
651
652         if (unlikely(current->audit_context) && syscall_exit_p) {
653                 unsigned long tstate = regs->tstate;
654                 int result = AUDITSC_SUCCESS;
655
656                 if (unlikely(tstate & (TSTATE_XCARRY | TSTATE_ICARRY)))
657                         result = AUDITSC_FAILURE;
658
659                 audit_syscall_exit(result, regs->u_regs[UREG_I0]);
660         }
661
662         if (!(current->ptrace & PT_PTRACED))
663                 goto out;
664
665         if (!test_thread_flag(TIF_SYSCALL_TRACE))
666                 goto out;
667
668         ptrace_notify(SIGTRAP | ((current->ptrace & PT_TRACESYSGOOD)
669                                  ? 0x80 : 0));
670
671         /*
672          * this isn't the same as continuing with a signal, but it will do
673          * for normal use.  strace only continues with a signal if the
674          * stopping signal is not SIGTRAP.  -brl
675          */
676         if (current->exit_code) {
677                 send_sig(current->exit_code, current, 1);
678                 current->exit_code = 0;
679         }
680
681 out:
682         if (unlikely(current->audit_context) && !syscall_exit_p)
683                 audit_syscall_entry((test_thread_flag(TIF_32BIT) ?
684                                      AUDIT_ARCH_SPARC :
685                                      AUDIT_ARCH_SPARC64),
686                                     regs->u_regs[UREG_G1],
687                                     regs->u_regs[UREG_I0],
688                                     regs->u_regs[UREG_I1],
689                                     regs->u_regs[UREG_I2],
690                                     regs->u_regs[UREG_I3]);
691 }