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 }