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
  35 /* Returning from ptrace is a bit tricky because the syscall return
  36  * low level code assumes any value returned which is negative and
  37  * is a valid errno will mean setting the condition codes to indicate
  38  * an error return.  This doesn't work, so we have this hook.
  39  */
  40 static inline void pt_error_return(struct pt_regs *regs, unsigned long error)
  41 {
  42         regs->u_regs[UREG_I0] = error;
  43         regs->tstate |= (TSTATE_ICARRY | TSTATE_XCARRY);
  44         regs->tpc = regs->tnpc;
  45         regs->tnpc += 4;
  46 }
  47
  48 static inline void pt_succ_return(struct pt_regs *regs, unsigned long value)
  49 {
  50         regs->u_regs[UREG_I0] = value;
  51         regs->tstate &= ~(TSTATE_ICARRY | TSTATE_XCARRY);
  52         regs->tpc = regs->tnpc;
  53         regs->tnpc += 4;
  54 }
  55
  56 static inline void
  57 pt_succ_return_linux(struct pt_regs *regs, unsigned long value, void __user *addr)
  58 {
  59         if (test_thread_flag(TIF_32BIT)) {
  60                 if (put_user(value, (unsigned int __user *) addr)) {
  61                         pt_error_return(regs, EFAULT);
  62                         return;
  63                 }
  64         } else {
  65                 if (put_user(value, (long __user *) addr)) {
  66                         pt_error_return(regs, EFAULT);
  67                         return;
  68                 }
  69         }
  70         regs->u_regs[UREG_I0] = 0;
  71         regs->tstate &= ~(TSTATE_ICARRY | TSTATE_XCARRY);
  72         regs->tpc = regs->tnpc;
  73         regs->tnpc += 4;
  74 }
  75
  76 static void
  77 pt_os_succ_return (struct pt_regs *regs, unsigned long val, void __user *addr)
  78 {
  79         if (current->personality == PER_SUNOS)
  80                 pt_succ_return (regs, val);
  81         else
  82                 pt_succ_return_linux (regs, val, addr);
  83 }
  84
  85 /* #define ALLOW_INIT_TRACING */
  86 /* #define DEBUG_PTRACE */
  87
  88 #ifdef DEBUG_PTRACE
  89 char *pt_rq [] = {
  90         /* 0  */ "TRACEME", "PEEKTEXT", "PEEKDATA", "PEEKUSR",
  91         /* 4  */ "POKETEXT", "POKEDATA", "POKEUSR", "CONT",
  92         /* 8  */ "KILL", "SINGLESTEP", "SUNATTACH", "SUNDETACH",
  93         /* 12 */ "GETREGS", "SETREGS", "GETFPREGS", "SETFPREGS",
  94         /* 16 */ "READDATA", "WRITEDATA", "READTEXT", "WRITETEXT",
  95         /* 20 */ "GETFPAREGS", "SETFPAREGS", "unknown", "unknown",
  96         /* 24 */ "SYSCALL", ""
  97 };
  98 #endif
  99
 100 /*
 101  * Called by kernel/ptrace.c when detaching..
 102  *
 103  * Make sure single step bits etc are not set.
 104  */
 105 void ptrace_disable(struct task_struct *child)
 106 {
 107         /* nothing to do */
 108 }
 109
 110 /* To get the necessary page struct, access_process_vm() first calls
 111  * get_user_pages().  This has done a flush_dcache_page() on the
 112  * accessed page.  Then our caller (copy_{to,from}_user_page()) did
 113  * to memcpy to read/write the data from that page.
 114  *
 115  * Now, the only thing we have to do is:
 116  * 1) flush the D-cache if it's possible than an illegal alias
 117  *    has been created
 118  * 2) flush the I-cache if this is pre-cheetah and we did a write
 119  */
 120 void flush_ptrace_access(struct vm_area_struct *vma, struct page *page,
 121                          unsigned long uaddr, void *kaddr,
 122                          unsigned long len, int write)
 123 {
 124         BUG_ON(len > PAGE_SIZE);
 125
 126 #ifdef DCACHE_ALIASING_POSSIBLE
 127         /* If bit 13 of the kernel address we used to access the
 128          * user page is the same as the virtual address that page
 129          * is mapped to in the user's address space, we can skip the
 130          * D-cache flush.
 131          */
 132         if ((uaddr ^ (unsigned long) kaddr) & (1UL << 13)) {
 133                 unsigned long start = __pa(kaddr);
 134                 unsigned long end = start + len;
 135
 136                 if (tlb_type == spitfire) {
 137                         for (; start < end; start += 32)
 138                                 spitfire_put_dcache_tag(start & 0x3fe0, 0x0);
 139                 } else {
 140                         for (; start < end; start += 32)
 141                                 __asm__ __volatile__(
 142                                         "stxa %%g0, [%0] %1\n\t"
 143                                         "membar #Sync"
 144                                         : /* no outputs */
 145                                         : "r" (start),
 146                                         "i" (ASI_DCACHE_INVALIDATE));
 147                 }
 148         }
 149 #endif
 150         if (write && tlb_type == spitfire) {
 151                 unsigned long start = (unsigned long) kaddr;
 152                 unsigned long end = start + len;
 153
 154                 for (; start < end; start += 32)
 155                         flushi(start);
 156         }
 157 }
 158
 159 asmlinkage void do_ptrace(struct pt_regs *regs)
 160 {
 161         int request = regs->u_regs[UREG_I0];
 162         pid_t pid = regs->u_regs[UREG_I1];
 163         unsigned long addr = regs->u_regs[UREG_I2];
 164         unsigned long data = regs->u_regs[UREG_I3];
 165         unsigned long addr2 = regs->u_regs[UREG_I4];
 166         struct task_struct *child;
 167         int ret;
 168
 169         if (test_thread_flag(TIF_32BIT)) {
 170                 addr &= 0xffffffffUL;
 171                 data &= 0xffffffffUL;
 172                 addr2 &= 0xffffffffUL;
 173         }
 174         lock_kernel();
 175 #ifdef DEBUG_PTRACE
 176         {
 177                 char *s;
 178
 179                 if ((request >= 0) && (request <= 24))
 180                         s = pt_rq [request];
 181                 else
 182                         s = "unknown";
 183
 184                 if (request == PTRACE_POKEDATA && data == 0x91d02001){
 185                         printk ("do_ptrace: breakpoint pid=%d, addr=%016lx addr2=%016lx\n",
 186                                 pid, addr, addr2);
 187                 } else
 188                         printk("do_ptrace: rq=%s(%d) pid=%d addr=%016lx data=%016lx addr2=%016lx\n",
 189                                s, request, pid, addr, data, addr2);
 190         }
 191 #endif
 192         if (request == PTRACE_TRACEME) {
 193                 int ret;
 194
 195                 /* are we already being traced? */
 196                 if (current->ptrace & PT_PTRACED) {
 197                         pt_error_return(regs, EPERM);
 198                         goto out;
 199                 }
 200                 ret = security_ptrace(current->parent, current);
 201                 if (ret) {
 202                         pt_error_return(regs, -ret);
 203                         goto out;
 204                 }
 205
 206                 /* set the ptrace bit in the process flags. */
 207                 current->ptrace |= PT_PTRACED;
 208                 pt_succ_return(regs, 0);
 209                 goto out;
 210         }
 211 #ifndef ALLOW_INIT_TRACING
 212         if (pid == 1) {
 213                 /* Can't dork with init. */
 214                 pt_error_return(regs, EPERM);
 215                 goto out;
 216         }
 217 #endif
 218         read_lock(&tasklist_lock);
 219         child = find_task_by_pid(pid);
 220         if (child)
 221                 get_task_struct(child);
 222         read_unlock(&tasklist_lock);
 223
 224         if (!child) {
 225                 pt_error_return(regs, ESRCH);
 226                 goto out;
 227         }
 228
 229         if ((current->personality == PER_SUNOS && request == PTRACE_SUNATTACH)
 230             || (current->personality != PER_SUNOS && request == PTRACE_ATTACH)) {
 231                 if (ptrace_attach(child)) {
 232                         pt_error_return(regs, EPERM);
 233                         goto out_tsk;
 234                 }
 235                 pt_succ_return(regs, 0);
 236                 goto out_tsk;
 237         }
 238
 239         ret = ptrace_check_attach(child, request == PTRACE_KILL);
 240         if (ret < 0) {
 241                 pt_error_return(regs, -ret);
 242                 goto out_tsk;
 243         }
 244
 245         if (!(test_thread_flag(TIF_32BIT))      &&
 246             ((request == PTRACE_READDATA64)             ||
 247              (request == PTRACE_WRITEDATA64)            ||
 248              (request == PTRACE_READTEXT64)             ||
 249              (request == PTRACE_WRITETEXT64)            ||
 250              (request == PTRACE_PEEKTEXT64)             ||
 251              (request == PTRACE_POKETEXT64)             ||
 252              (request == PTRACE_PEEKDATA64)             ||
 253              (request == PTRACE_POKEDATA64))) {
 254                 addr = regs->u_regs[UREG_G2];
 255                 addr2 = regs->u_regs[UREG_G3];
 256                 request -= 30; /* wheee... */
 257         }
 258
 259         switch(request) {
 260         case PTRACE_PEEKTEXT: /* read word at location addr. */
 261         case PTRACE_PEEKDATA: {
 262                 unsigned long tmp64;
 263                 unsigned int tmp32;
 264                 int res, copied;
 265
 266                 res = -EIO;
 267                 if (test_thread_flag(TIF_32BIT)) {
 268                         copied = access_process_vm(child, addr,
 269                                                    &tmp32, sizeof(tmp32), 0);
 270                         tmp64 = (unsigned long) tmp32;
 271                         if (copied == sizeof(tmp32))
 272                                 res = 0;
 273                 } else {
 274                         copied = access_process_vm(child, addr,
 275                                                    &tmp64, sizeof(tmp64), 0);
 276                         if (copied == sizeof(tmp64))
 277                                 res = 0;
 278                 }
 279                 if (res < 0)
 280                         pt_error_return(regs, -res);
 281                 else
 282                         pt_os_succ_return(regs, tmp64, (void __user *) data);
 283                 goto out_tsk;
 284         }
 285
 286         case PTRACE_POKETEXT: /* write the word at location addr. */
 287         case PTRACE_POKEDATA: {
 288                 unsigned long tmp64;
 289                 unsigned int tmp32;
 290                 int copied, res = -EIO;
 291
 292                 if (test_thread_flag(TIF_32BIT)) {
 293                         tmp32 = data;
 294                         copied = access_process_vm(child, addr,
 295                                                    &tmp32, sizeof(tmp32), 1);
 296                         if (copied == sizeof(tmp32))
 297                                 res = 0;
 298                 } else {
 299                         tmp64 = data;
 300                         copied = access_process_vm(child, addr,
 301                                                    &tmp64, sizeof(tmp64), 1);
 302                         if (copied == sizeof(tmp64))
 303                                 res = 0;
 304                 }
 305                 if (res < 0)
 306                         pt_error_return(regs, -res);
 307                 else
 308                         pt_succ_return(regs, res);
 309                 goto out_tsk;
 310         }
 311
 312         case PTRACE_GETREGS: {
 313                 struct pt_regs32 __user *pregs =
 314                         (struct pt_regs32 __user *) addr;
 315                 struct pt_regs *cregs = child->thread_info->kregs;
 316                 int rval;
 317
 318                 if (__put_user(tstate_to_psr(cregs->tstate), (&pregs->psr)) ||
 319                     __put_user(cregs->tpc, (&pregs->pc)) ||
 320                     __put_user(cregs->tnpc, (&pregs->npc)) ||
 321                     __put_user(cregs->y, (&pregs->y))) {
 322                         pt_error_return(regs, EFAULT);
 323                         goto out_tsk;
 324                 }
 325                 for (rval = 1; rval < 16; rval++)
 326                         if (__put_user(cregs->u_regs[rval], (&pregs->u_regs[rval - 1]))) {
 327                                 pt_error_return(regs, EFAULT);
 328                                 goto out_tsk;
 329                         }
 330                 pt_succ_return(regs, 0);
 331 #ifdef DEBUG_PTRACE
 332                 printk ("PC=%lx nPC=%lx o7=%lx\n", cregs->tpc, cregs->tnpc, cregs->u_regs [15]);
 333 #endif
 334                 goto out_tsk;
 335         }
 336
 337         case PTRACE_GETREGS64: {
 338                 struct pt_regs __user *pregs = (struct pt_regs __user *) addr;
 339                 struct pt_regs *cregs = child->thread_info->kregs;
 340                 unsigned long tpc = cregs->tpc;
 341                 int rval;
 342
 343                 if ((child->thread_info->flags & _TIF_32BIT) != 0)
 344                         tpc &= 0xffffffff;
 345                 if (__put_user(cregs->tstate, (&pregs->tstate)) ||
 346                     __put_user(tpc, (&pregs->tpc)) ||
 347                     __put_user(cregs->tnpc, (&pregs->tnpc)) ||
 348                     __put_user(cregs->y, (&pregs->y))) {
 349                         pt_error_return(regs, EFAULT);
 350                         goto out_tsk;
 351                 }
 352                 for (rval = 1; rval < 16; rval++)
 353                         if (__put_user(cregs->u_regs[rval], (&pregs->u_regs[rval - 1]))) {
 354                                 pt_error_return(regs, EFAULT);
 355                                 goto out_tsk;
 356                         }
 357                 pt_succ_return(regs, 0);
 358 #ifdef DEBUG_PTRACE
 359                 printk ("PC=%lx nPC=%lx o7=%lx\n", cregs->tpc, cregs->tnpc, cregs->u_regs [15]);
 360 #endif
 361                 goto out_tsk;
 362         }
 363
 364         case PTRACE_SETREGS: {
 365                 struct pt_regs32 __user *pregs =
 366                         (struct pt_regs32 __user *) addr;
 367                 struct pt_regs *cregs = child->thread_info->kregs;
 368                 unsigned int psr, pc, npc, y;
 369                 int i;
 370
 371                 /* Must be careful, tracing process can only set certain
 372                  * bits in the psr.
 373                  */
 374                 if (__get_user(psr, (&pregs->psr)) ||
 375                     __get_user(pc, (&pregs->pc)) ||
 376                     __get_user(npc, (&pregs->npc)) ||
 377                     __get_user(y, (&pregs->y))) {
 378                         pt_error_return(regs, EFAULT);
 379                         goto out_tsk;
 380                 }
 381                 cregs->tstate &= ~(TSTATE_ICC);
 382                 cregs->tstate |= psr_to_tstate_icc(psr);
 383                 if (!((pc | npc) & 3)) {
 384                         cregs->tpc = pc;
 385                         cregs->tnpc = npc;
 386                 }
 387                 cregs->y = y;
 388                 for (i = 1; i < 16; i++) {
 389                         if (__get_user(cregs->u_regs[i], (&pregs->u_regs[i-1]))) {
 390                                 pt_error_return(regs, EFAULT);
 391                                 goto out_tsk;
 392                         }
 393                 }
 394                 pt_succ_return(regs, 0);
 395                 goto out_tsk;
 396         }
 397
 398         case PTRACE_SETREGS64: {
 399                 struct pt_regs __user *pregs = (struct pt_regs __user *) addr;
 400                 struct pt_regs *cregs = child->thread_info->kregs;
 401                 unsigned long tstate, tpc, tnpc, y;
 402                 int i;
 403
 404                 /* Must be careful, tracing process can only set certain
 405                  * bits in the psr.
 406                  */
 407                 if (__get_user(tstate, (&pregs->tstate)) ||
 408                     __get_user(tpc, (&pregs->tpc)) ||
 409                     __get_user(tnpc, (&pregs->tnpc)) ||
 410                     __get_user(y, (&pregs->y))) {
 411                         pt_error_return(regs, EFAULT);
 412                         goto out_tsk;
 413                 }
 414                 if ((child->thread_info->flags & _TIF_32BIT) != 0) {
 415                         tpc &= 0xffffffff;
 416                         tnpc &= 0xffffffff;
 417                 }
 418                 tstate &= (TSTATE_ICC | TSTATE_XCC);
 419                 cregs->tstate &= ~(TSTATE_ICC | TSTATE_XCC);
 420                 cregs->tstate |= tstate;
 421                 if (!((tpc | tnpc) & 3)) {
 422                         cregs->tpc = tpc;
 423                         cregs->tnpc = tnpc;
 424                 }
 425                 cregs->y = y;
 426                 for (i = 1; i < 16; i++) {
 427                         if (__get_user(cregs->u_regs[i], (&pregs->u_regs[i-1]))) {
 428                                 pt_error_return(regs, EFAULT);
 429                                 goto out_tsk;
 430                         }
 431                 }
 432                 pt_succ_return(regs, 0);
 433                 goto out_tsk;
 434         }
 435
 436         case PTRACE_GETFPREGS: {
 437                 struct fps {
 438                         unsigned int regs[32];
 439                         unsigned int fsr;
 440                         unsigned int flags;
 441                         unsigned int extra;
 442                         unsigned int fpqd;
 443                         struct fq {
 444                                 unsigned int insnaddr;
 445                                 unsigned int insn;
 446                         } fpq[16];
 447                 };
 448                 struct fps __user *fps = (struct fps __user *) addr;
 449                 unsigned long *fpregs = child->thread_info->fpregs;
 450
 451                 if (copy_to_user(&fps->regs[0], fpregs,
 452                                  (32 * sizeof(unsigned int))) ||
 453                     __put_user(child->thread_info->xfsr[0], (&fps->fsr)) ||
 454                     __put_user(0, (&fps->fpqd)) ||
 455                     __put_user(0, (&fps->flags)) ||
 456                     __put_user(0, (&fps->extra)) ||
 457                     clear_user(&fps->fpq[0], 32 * sizeof(unsigned int))) {
 458                         pt_error_return(regs, EFAULT);
 459                         goto out_tsk;
 460                 }
 461                 pt_succ_return(regs, 0);
 462                 goto out_tsk;
 463         }
 464
 465         case PTRACE_GETFPREGS64: {
 466                 struct fps {
 467                         unsigned int regs[64];
 468                         unsigned long fsr;
 469                 };
 470                 struct fps __user *fps = (struct fps __user *) addr;
 471                 unsigned long *fpregs = child->thread_info->fpregs;
 472
 473                 if (copy_to_user(&fps->regs[0], fpregs,
 474                                  (64 * sizeof(unsigned int))) ||
 475                     __put_user(child->thread_info->xfsr[0], (&fps->fsr))) {
 476                         pt_error_return(regs, EFAULT);
 477                         goto out_tsk;
 478                 }
 479                 pt_succ_return(regs, 0);
 480                 goto out_tsk;
 481         }
 482
 483         case PTRACE_SETFPREGS: {
 484                 struct fps {
 485                         unsigned int regs[32];
 486                         unsigned int fsr;
 487                         unsigned int flags;
 488                         unsigned int extra;
 489                         unsigned int fpqd;
 490                         struct fq {
 491                                 unsigned int insnaddr;
 492                                 unsigned int insn;
 493                         } fpq[16];
 494                 };
 495                 struct fps __user *fps = (struct fps __user *) addr;
 496                 unsigned long *fpregs = child->thread_info->fpregs;
 497                 unsigned fsr;
 498
 499                 if (copy_from_user(fpregs, &fps->regs[0],
 500                                    (32 * sizeof(unsigned int))) ||
 501                     __get_user(fsr, (&fps->fsr))) {
 502                         pt_error_return(regs, EFAULT);
 503                         goto out_tsk;
 504                 }
 505                 child->thread_info->xfsr[0] &= 0xffffffff00000000UL;
 506                 child->thread_info->xfsr[0] |= fsr;
 507                 if (!(child->thread_info->fpsaved[0] & FPRS_FEF))
 508                         child->thread_info->gsr[0] = 0;
 509                 child->thread_info->fpsaved[0] |= (FPRS_FEF | FPRS_DL);
 510                 pt_succ_return(regs, 0);
 511                 goto out_tsk;
 512         }
 513
 514         case PTRACE_SETFPREGS64: {
 515                 struct fps {
 516                         unsigned int regs[64];
 517                         unsigned long fsr;
 518                 };
 519                 struct fps __user *fps = (struct fps __user *) addr;
 520                 unsigned long *fpregs = child->thread_info->fpregs;
 521
 522                 if (copy_from_user(fpregs, &fps->regs[0],
 523                                    (64 * sizeof(unsigned int))) ||
 524                     __get_user(child->thread_info->xfsr[0], (&fps->fsr))) {
 525                         pt_error_return(regs, EFAULT);
 526                         goto out_tsk;
 527                 }
 528                 if (!(child->thread_info->fpsaved[0] & FPRS_FEF))
 529                         child->thread_info->gsr[0] = 0;
 530                 child->thread_info->fpsaved[0] |= (FPRS_FEF | FPRS_DL | FPRS_DU);
 531                 pt_succ_return(regs, 0);
 532                 goto out_tsk;
 533         }
 534
 535         case PTRACE_READTEXT:
 536         case PTRACE_READDATA: {
 537                 int res = ptrace_readdata(child, addr,
 538                                           (char __user *)addr2, data);
 539                 if (res == data) {
 540                         pt_succ_return(regs, 0);
 541                         goto out_tsk;
 542                 }
 543                 if (res >= 0)
 544                         res = -EIO;
 545                 pt_error_return(regs, -res);
 546                 goto out_tsk;
 547         }
 548
 549         case PTRACE_WRITETEXT:
 550         case PTRACE_WRITEDATA: {
 551                 int res = ptrace_writedata(child, (char __user *) addr2,
 552                                            addr, data);
 553                 if (res == data) {
 554                         pt_succ_return(regs, 0);
 555                         goto out_tsk;
 556                 }
 557                 if (res >= 0)
 558                         res = -EIO;
 559                 pt_error_return(regs, -res);
 560                 goto out_tsk;
 561         }
 562         case PTRACE_SYSCALL: /* continue and stop at (return from) syscall */
 563                 addr = 1;
 564
 565         case PTRACE_CONT: { /* restart after signal. */
 566                 if (!valid_signal(data)) {
 567                         pt_error_return(regs, EIO);
 568                         goto out_tsk;
 569                 }
 570
 571                 if (request == PTRACE_SYSCALL) {
 572                         set_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
 573                 } else {
 574                         clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
 575                 }
 576
 577                 child->exit_code = data;
 578 #ifdef DEBUG_PTRACE
 579                 printk("CONT: %s [%d]: set exit_code = %x %lx %lx\n", child->comm,
 580                         child->pid, child->exit_code,
 581                         child->thread_info->kregs->tpc,
 582                         child->thread_info->kregs->tnpc);
 583
 584 #endif
 585                 wake_up_process(child);
 586                 pt_succ_return(regs, 0);
 587                 goto out_tsk;
 588         }
 589
 590 /*
 591  * make the child exit.  Best I can do is send it a sigkill.
 592  * perhaps it should be put in the status that it wants to
 593  * exit.
 594  */
 595         case PTRACE_KILL: {
 596                 if (child->exit_state == EXIT_ZOMBIE) { /* already dead */
 597                         pt_succ_return(regs, 0);
 598                         goto out_tsk;
 599                 }
 600                 child->exit_code = SIGKILL;
 601                 wake_up_process(child);
 602                 pt_succ_return(regs, 0);
 603                 goto out_tsk;
 604         }
 605
 606         case PTRACE_SUNDETACH: { /* detach a process that was attached. */
 607                 int error = ptrace_detach(child, data);
 608                 if (error) {
 609                         pt_error_return(regs, EIO);
 610                         goto out_tsk;
 611                 }
 612                 pt_succ_return(regs, 0);
 613                 goto out_tsk;
 614         }
 615
 616         /* PTRACE_DUMPCORE unsupported... */
 617
 618         default: {
 619                 int err = ptrace_request(child, request, addr, data);
 620                 if (err)
 621                         pt_error_return(regs, -err);
 622                 else
 623                         pt_succ_return(regs, 0);
 624                 goto out_tsk;
 625         }
 626         }
 627 out_tsk:
 628         if (child)
 629                 put_task_struct(child);
 630 out:
 631         unlock_kernel();
 632 }
 633
 634 asmlinkage void syscall_trace(struct pt_regs *regs, int syscall_exit_p)
 635 {
 636         /* do the secure computing check first */
 637         secure_computing(regs->u_regs[UREG_G1]);
 638
 639         if (unlikely(current->audit_context) && syscall_exit_p) {
 640                 unsigned long tstate = regs->tstate;
 641                 int result = AUDITSC_SUCCESS;
 642
 643                 if (unlikely(tstate & (TSTATE_XCARRY | TSTATE_ICARRY)))
 644                         result = AUDITSC_FAILURE;
 645
 646                 audit_syscall_exit(current, result, regs->u_regs[UREG_I0]);
 647         }
 648
 649         if (!(current->ptrace & PT_PTRACED))
 650                 goto out;
 651
 652         if (!test_thread_flag(TIF_SYSCALL_TRACE))
 653                 goto out;
 654
 655         ptrace_notify(SIGTRAP | ((current->ptrace & PT_TRACESYSGOOD)
 656                                  ? 0x80 : 0));
 657
 658         /*
 659          * this isn't the same as continuing with a signal, but it will do
 660          * for normal use.  strace only continues with a signal if the
 661          * stopping signal is not SIGTRAP.  -brl
 662          */
 663         if (current->exit_code) {
 664                 send_sig(current->exit_code, current, 1);
 665                 current->exit_code = 0;
 666         }
 667
 668 out:
 669         if (unlikely(current->audit_context) && !syscall_exit_p)
 670                 audit_syscall_entry(current,
 671                                     (test_thread_flag(TIF_32BIT) ?
 672                                      AUDIT_ARCH_SPARC :
 673                                      AUDIT_ARCH_SPARC64),
 674                                     regs->u_regs[UREG_G1],
 675                                     regs->u_regs[UREG_I0],
 676                                     regs->u_regs[UREG_I1],
 677                                     regs->u_regs[UREG_I2],
 678                                     regs->u_regs[UREG_I3]);
 679 }