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                 pt_succ_return(regs, 0);
 206                 goto out;
 207         }
 208
 209         child = ptrace_get_task_struct(pid);
 210         if (IS_ERR(child)) {
 211                 ret = PTR_ERR(child);
 212                 pt_error_return(regs, -ret);
 213                 goto out;
 214         }
 215
 216         if ((current->personality == PER_SUNOS && request == PTRACE_SUNATTACH)
 217             || (current->personality != PER_SUNOS && request == PTRACE_ATTACH)) {
 218                 if (ptrace_attach(child)) {
 219                         pt_error_return(regs, EPERM);
 220                         goto out_tsk;
 221                 }
 222                 pt_succ_return(regs, 0);
 223                 goto out_tsk;
 224         }
 225
 226         ret = ptrace_check_attach(child, request == PTRACE_KILL);
 227         if (ret < 0) {
 228                 pt_error_return(regs, -ret);
 229                 goto out_tsk;
 230         }
 231
 232         if (!(test_thread_flag(TIF_32BIT))      &&
 233             ((request == PTRACE_READDATA64)             ||
 234              (request == PTRACE_WRITEDATA64)            ||
 235              (request == PTRACE_READTEXT64)             ||
 236              (request == PTRACE_WRITETEXT64)            ||
 237              (request == PTRACE_PEEKTEXT64)             ||
 238              (request == PTRACE_POKETEXT64)             ||
 239              (request == PTRACE_PEEKDATA64)             ||
 240              (request == PTRACE_POKEDATA64))) {
 241                 addr = regs->u_regs[UREG_G2];
 242                 addr2 = regs->u_regs[UREG_G3];
 243                 request -= 30; /* wheee... */
 244         }
 245
 246         switch(request) {
 247         case PTRACE_PEEKTEXT: /* read word at location addr. */
 248         case PTRACE_PEEKDATA: {
 249                 unsigned long tmp64;
 250                 unsigned int tmp32;
 251                 int res, copied;
 252
 253                 res = -EIO;
 254                 if (test_thread_flag(TIF_32BIT)) {
 255                         copied = access_process_vm(child, addr,
 256                                                    &tmp32, sizeof(tmp32), 0);
 257                         tmp64 = (unsigned long) tmp32;
 258                         if (copied == sizeof(tmp32))
 259                                 res = 0;
 260                 } else {
 261                         copied = access_process_vm(child, addr,
 262                                                    &tmp64, sizeof(tmp64), 0);
 263                         if (copied == sizeof(tmp64))
 264                                 res = 0;
 265                 }
 266                 if (res < 0)
 267                         pt_error_return(regs, -res);
 268                 else
 269                         pt_os_succ_return(regs, tmp64, (void __user *) data);
 270                 goto out_tsk;
 271         }
 272
 273         case PTRACE_POKETEXT: /* write the word at location addr. */
 274         case PTRACE_POKEDATA: {
 275                 unsigned long tmp64;
 276                 unsigned int tmp32;
 277                 int copied, res = -EIO;
 278
 279                 if (test_thread_flag(TIF_32BIT)) {
 280                         tmp32 = data;
 281                         copied = access_process_vm(child, addr,
 282                                                    &tmp32, sizeof(tmp32), 1);
 283                         if (copied == sizeof(tmp32))
 284                                 res = 0;
 285                 } else {
 286                         tmp64 = data;
 287                         copied = access_process_vm(child, addr,
 288                                                    &tmp64, sizeof(tmp64), 1);
 289                         if (copied == sizeof(tmp64))
 290                                 res = 0;
 291                 }
 292                 if (res < 0)
 293                         pt_error_return(regs, -res);
 294                 else
 295                         pt_succ_return(regs, res);
 296                 goto out_tsk;
 297         }
 298
 299         case PTRACE_GETREGS: {
 300                 struct pt_regs32 __user *pregs =
 301                         (struct pt_regs32 __user *) addr;
 302                 struct pt_regs *cregs = task_pt_regs(child);
 303                 int rval;
 304
 305                 if (__put_user(tstate_to_psr(cregs->tstate), (&pregs->psr)) ||
 306                     __put_user(cregs->tpc, (&pregs->pc)) ||
 307                     __put_user(cregs->tnpc, (&pregs->npc)) ||
 308                     __put_user(cregs->y, (&pregs->y))) {
 309                         pt_error_return(regs, EFAULT);
 310                         goto out_tsk;
 311                 }
 312                 for (rval = 1; rval < 16; rval++)
 313                         if (__put_user(cregs->u_regs[rval], (&pregs->u_regs[rval - 1]))) {
 314                                 pt_error_return(regs, EFAULT);
 315                                 goto out_tsk;
 316                         }
 317                 pt_succ_return(regs, 0);
 318 #ifdef DEBUG_PTRACE
 319                 printk ("PC=%lx nPC=%lx o7=%lx\n", cregs->tpc, cregs->tnpc, cregs->u_regs [15]);
 320 #endif
 321                 goto out_tsk;
 322         }
 323
 324         case PTRACE_GETREGS64: {
 325                 struct pt_regs __user *pregs = (struct pt_regs __user *) addr;
 326                 struct pt_regs *cregs = task_pt_regs(child);
 327                 unsigned long tpc = cregs->tpc;
 328                 int rval;
 329
 330                 if ((task_thread_info(child)->flags & _TIF_32BIT) != 0)
 331                         tpc &= 0xffffffff;
 332                 if (__put_user(cregs->tstate, (&pregs->tstate)) ||
 333                     __put_user(tpc, (&pregs->tpc)) ||
 334                     __put_user(cregs->tnpc, (&pregs->tnpc)) ||
 335                     __put_user(cregs->y, (&pregs->y))) {
 336                         pt_error_return(regs, EFAULT);
 337                         goto out_tsk;
 338                 }
 339                 for (rval = 1; rval < 16; rval++)
 340                         if (__put_user(cregs->u_regs[rval], (&pregs->u_regs[rval - 1]))) {
 341                                 pt_error_return(regs, EFAULT);
 342                                 goto out_tsk;
 343                         }
 344                 pt_succ_return(regs, 0);
 345 #ifdef DEBUG_PTRACE
 346                 printk ("PC=%lx nPC=%lx o7=%lx\n", cregs->tpc, cregs->tnpc, cregs->u_regs [15]);
 347 #endif
 348                 goto out_tsk;
 349         }
 350
 351         case PTRACE_SETREGS: {
 352                 struct pt_regs32 __user *pregs =
 353                         (struct pt_regs32 __user *) addr;
 354                 struct pt_regs *cregs = task_pt_regs(child);
 355                 unsigned int psr, pc, npc, y;
 356                 int i;
 357
 358                 /* Must be careful, tracing process can only set certain
 359                  * bits in the psr.
 360                  */
 361                 if (__get_user(psr, (&pregs->psr)) ||
 362                     __get_user(pc, (&pregs->pc)) ||
 363                     __get_user(npc, (&pregs->npc)) ||
 364                     __get_user(y, (&pregs->y))) {
 365                         pt_error_return(regs, EFAULT);
 366                         goto out_tsk;
 367                 }
 368                 cregs->tstate &= ~(TSTATE_ICC);
 369                 cregs->tstate |= psr_to_tstate_icc(psr);
 370                 if (!((pc | npc) & 3)) {
 371                         cregs->tpc = pc;
 372                         cregs->tnpc = npc;
 373                 }
 374                 cregs->y = y;
 375                 for (i = 1; i < 16; i++) {
 376                         if (__get_user(cregs->u_regs[i], (&pregs->u_regs[i-1]))) {
 377                                 pt_error_return(regs, EFAULT);
 378                                 goto out_tsk;
 379                         }
 380                 }
 381                 pt_succ_return(regs, 0);
 382                 goto out_tsk;
 383         }
 384
 385         case PTRACE_SETREGS64: {
 386                 struct pt_regs __user *pregs = (struct pt_regs __user *) addr;
 387                 struct pt_regs *cregs = task_pt_regs(child);
 388                 unsigned long tstate, tpc, tnpc, y;
 389                 int i;
 390
 391                 /* Must be careful, tracing process can only set certain
 392                  * bits in the psr.
 393                  */
 394                 if (__get_user(tstate, (&pregs->tstate)) ||
 395                     __get_user(tpc, (&pregs->tpc)) ||
 396                     __get_user(tnpc, (&pregs->tnpc)) ||
 397                     __get_user(y, (&pregs->y))) {
 398                         pt_error_return(regs, EFAULT);
 399                         goto out_tsk;
 400                 }
 401                 if ((task_thread_info(child)->flags & _TIF_32BIT) != 0) {
 402                         tpc &= 0xffffffff;
 403                         tnpc &= 0xffffffff;
 404                 }
 405                 tstate &= (TSTATE_ICC | TSTATE_XCC);
 406                 cregs->tstate &= ~(TSTATE_ICC | TSTATE_XCC);
 407                 cregs->tstate |= tstate;
 408                 if (!((tpc | tnpc) & 3)) {
 409                         cregs->tpc = tpc;
 410                         cregs->tnpc = tnpc;
 411                 }
 412                 cregs->y = y;
 413                 for (i = 1; i < 16; i++) {
 414                         if (__get_user(cregs->u_regs[i], (&pregs->u_regs[i-1]))) {
 415                                 pt_error_return(regs, EFAULT);
 416                                 goto out_tsk;
 417                         }
 418                 }
 419                 pt_succ_return(regs, 0);
 420                 goto out_tsk;
 421         }
 422
 423         case PTRACE_GETFPREGS: {
 424                 struct fps {
 425                         unsigned int regs[32];
 426                         unsigned int fsr;
 427                         unsigned int flags;
 428                         unsigned int extra;
 429                         unsigned int fpqd;
 430                         struct fq {
 431                                 unsigned int insnaddr;
 432                                 unsigned int insn;
 433                         } fpq[16];
 434                 };
 435                 struct fps __user *fps = (struct fps __user *) addr;
 436                 unsigned long *fpregs = task_thread_info(child)->fpregs;
 437
 438                 if (copy_to_user(&fps->regs[0], fpregs,
 439                                  (32 * sizeof(unsigned int))) ||
 440                     __put_user(task_thread_info(child)->xfsr[0], (&fps->fsr)) ||
 441                     __put_user(0, (&fps->fpqd)) ||
 442                     __put_user(0, (&fps->flags)) ||
 443                     __put_user(0, (&fps->extra)) ||
 444                     clear_user(&fps->fpq[0], 32 * sizeof(unsigned int))) {
 445                         pt_error_return(regs, EFAULT);
 446                         goto out_tsk;
 447                 }
 448                 pt_succ_return(regs, 0);
 449                 goto out_tsk;
 450         }
 451
 452         case PTRACE_GETFPREGS64: {
 453                 struct fps {
 454                         unsigned int regs[64];
 455                         unsigned long fsr;
 456                 };
 457                 struct fps __user *fps = (struct fps __user *) addr;
 458                 unsigned long *fpregs = task_thread_info(child)->fpregs;
 459
 460                 if (copy_to_user(&fps->regs[0], fpregs,
 461                                  (64 * sizeof(unsigned int))) ||
 462                     __put_user(task_thread_info(child)->xfsr[0], (&fps->fsr))) {
 463                         pt_error_return(regs, EFAULT);
 464                         goto out_tsk;
 465                 }
 466                 pt_succ_return(regs, 0);
 467                 goto out_tsk;
 468         }
 469
 470         case PTRACE_SETFPREGS: {
 471                 struct fps {
 472                         unsigned int regs[32];
 473                         unsigned int fsr;
 474                         unsigned int flags;
 475                         unsigned int extra;
 476                         unsigned int fpqd;
 477                         struct fq {
 478                                 unsigned int insnaddr;
 479                                 unsigned int insn;
 480                         } fpq[16];
 481                 };
 482                 struct fps __user *fps = (struct fps __user *) addr;
 483                 unsigned long *fpregs = task_thread_info(child)->fpregs;
 484                 unsigned fsr;
 485
 486                 if (copy_from_user(fpregs, &fps->regs[0],
 487                                    (32 * sizeof(unsigned int))) ||
 488                     __get_user(fsr, (&fps->fsr))) {
 489                         pt_error_return(regs, EFAULT);
 490                         goto out_tsk;
 491                 }
 492                 task_thread_info(child)->xfsr[0] &= 0xffffffff00000000UL;
 493                 task_thread_info(child)->xfsr[0] |= fsr;
 494                 if (!(task_thread_info(child)->fpsaved[0] & FPRS_FEF))
 495                         task_thread_info(child)->gsr[0] = 0;
 496                 task_thread_info(child)->fpsaved[0] |= (FPRS_FEF | FPRS_DL);
 497                 pt_succ_return(regs, 0);
 498                 goto out_tsk;
 499         }
 500
 501         case PTRACE_SETFPREGS64: {
 502                 struct fps {
 503                         unsigned int regs[64];
 504                         unsigned long fsr;
 505                 };
 506                 struct fps __user *fps = (struct fps __user *) addr;
 507                 unsigned long *fpregs = task_thread_info(child)->fpregs;
 508
 509                 if (copy_from_user(fpregs, &fps->regs[0],
 510                                    (64 * sizeof(unsigned int))) ||
 511                     __get_user(task_thread_info(child)->xfsr[0], (&fps->fsr))) {
 512                         pt_error_return(regs, EFAULT);
 513                         goto out_tsk;
 514                 }
 515                 if (!(task_thread_info(child)->fpsaved[0] & FPRS_FEF))
 516                         task_thread_info(child)->gsr[0] = 0;
 517                 task_thread_info(child)->fpsaved[0] |= (FPRS_FEF | FPRS_DL | FPRS_DU);
 518                 pt_succ_return(regs, 0);
 519                 goto out_tsk;
 520         }
 521
 522         case PTRACE_READTEXT:
 523         case PTRACE_READDATA: {
 524                 int res = ptrace_readdata(child, addr,
 525                                           (char __user *)addr2, data);
 526                 if (res == data) {
 527                         pt_succ_return(regs, 0);
 528                         goto out_tsk;
 529                 }
 530                 if (res >= 0)
 531                         res = -EIO;
 532                 pt_error_return(regs, -res);
 533                 goto out_tsk;
 534         }
 535
 536         case PTRACE_WRITETEXT:
 537         case PTRACE_WRITEDATA: {
 538                 int res = ptrace_writedata(child, (char __user *) addr2,
 539                                            addr, data);
 540                 if (res == data) {
 541                         pt_succ_return(regs, 0);
 542                         goto out_tsk;
 543                 }
 544                 if (res >= 0)
 545                         res = -EIO;
 546                 pt_error_return(regs, -res);
 547                 goto out_tsk;
 548         }
 549         case PTRACE_SYSCALL: /* continue and stop at (return from) syscall */
 550                 addr = 1;
 551
 552         case PTRACE_CONT: { /* restart after signal. */
 553                 if (!valid_signal(data)) {
 554                         pt_error_return(regs, EIO);
 555                         goto out_tsk;
 556                 }
 557
 558                 if (request == PTRACE_SYSCALL) {
 559                         set_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
 560                 } else {
 561                         clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
 562                 }
 563
 564                 child->exit_code = data;
 565 #ifdef DEBUG_PTRACE
 566                 printk("CONT: %s [%d]: set exit_code = %x %lx %lx\n", child->comm,
 567                         child->pid, child->exit_code,
 568                         task_pt_regs(child)->tpc,
 569                         task_pt_regs(child)->tnpc);
 570
 571 #endif
 572                 wake_up_process(child);
 573                 pt_succ_return(regs, 0);
 574                 goto out_tsk;
 575         }
 576
 577 /*
 578  * make the child exit.  Best I can do is send it a sigkill.
 579  * perhaps it should be put in the status that it wants to
 580  * exit.
 581  */
 582         case PTRACE_KILL: {
 583                 if (child->exit_state == EXIT_ZOMBIE) { /* already dead */
 584                         pt_succ_return(regs, 0);
 585                         goto out_tsk;
 586                 }
 587                 child->exit_code = SIGKILL;
 588                 wake_up_process(child);
 589                 pt_succ_return(regs, 0);
 590                 goto out_tsk;
 591         }
 592
 593         case PTRACE_SUNDETACH: { /* detach a process that was attached. */
 594                 int error = ptrace_detach(child, data);
 595                 if (error) {
 596                         pt_error_return(regs, EIO);
 597                         goto out_tsk;
 598                 }
 599                 pt_succ_return(regs, 0);
 600                 goto out_tsk;
 601         }
 602
 603         /* PTRACE_DUMPCORE unsupported... */
 604
 605         default: {
 606                 int err = ptrace_request(child, request, addr, data);
 607                 if (err)
 608                         pt_error_return(regs, -err);
 609                 else
 610                         pt_succ_return(regs, 0);
 611                 goto out_tsk;
 612         }
 613         }
 614 out_tsk:
 615         if (child)
 616                 put_task_struct(child);
 617 out:
 618         unlock_kernel();
 619 }
 620
 621 asmlinkage void syscall_trace(struct pt_regs *regs, int syscall_exit_p)
 622 {
 623         /* do the secure computing check first */
 624         secure_computing(regs->u_regs[UREG_G1]);
 625
 626         if (unlikely(current->audit_context) && syscall_exit_p) {
 627                 unsigned long tstate = regs->tstate;
 628                 int result = AUDITSC_SUCCESS;
 629
 630                 if (unlikely(tstate & (TSTATE_XCARRY | TSTATE_ICARRY)))
 631                         result = AUDITSC_FAILURE;
 632
 633                 audit_syscall_exit(current, result, regs->u_regs[UREG_I0]);
 634         }
 635
 636         if (!(current->ptrace & PT_PTRACED))
 637                 goto out;
 638
 639         if (!test_thread_flag(TIF_SYSCALL_TRACE))
 640                 goto out;
 641
 642         ptrace_notify(SIGTRAP | ((current->ptrace & PT_TRACESYSGOOD)
 643                                  ? 0x80 : 0));
 644
 645         /*
 646          * this isn't the same as continuing with a signal, but it will do
 647          * for normal use.  strace only continues with a signal if the
 648          * stopping signal is not SIGTRAP.  -brl
 649          */
 650         if (current->exit_code) {
 651                 send_sig(current->exit_code, current, 1);
 652                 current->exit_code = 0;
 653         }
 654
 655 out:
 656         if (unlikely(current->audit_context) && !syscall_exit_p)
 657                 audit_syscall_entry(current,
 658                                     (test_thread_flag(TIF_32BIT) ?
 659                                      AUDIT_ARCH_SPARC :
 660                                      AUDIT_ARCH_SPARC64),
 661                                     regs->u_regs[UREG_G1],
 662                                     regs->u_regs[UREG_I0],
 663                                     regs->u_regs[UREG_I1],
 664                                     regs->u_regs[UREG_I2],
 665                                     regs->u_regs[UREG_I3]);
 666 }