sysdeps/unix/sysv/linux/mips/ptrace.c

   1 /* Copyright (C) 1995, 1996, 1997, 1998, 2000, 2002, 2003, 2004
   2         Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, write to the Free
  17    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  18    02111-1307 USA.  */
  19
  20 #include <errno.h>
  21 #include <sgidefs.h>
  22 #include <sys/types.h>
  23 #include <sys/ptrace.h>
  24 #include <sys/user.h>
  25 #include <stdarg.h>
  26
  27 #include <sysdep.h>
  28 #include <sys/syscall.h>
  29 #include <bp-checks.h>
  30 #include <sgidefs.h>
  31
  32 #if _MIPS_SIM == _ABIN32
  33 __extension__ typedef long long int reg_type;
  34 #else
  35 typedef long int reg_type;
  36 #endif
  37
  38 reg_type
  39 ptrace (enum __ptrace_request request, ...)
  40 {
  41   reg_type res, ret;
  42   va_list ap;
  43   pid_t pid;
  44   void *addr;
  45   reg_type data;
  46
  47   va_start (ap, request);
  48   pid = va_arg (ap, pid_t);
  49   addr = va_arg (ap, void *);
  50   data = va_arg (ap, reg_type);
  51   va_end (ap);
  52
  53   if (request > 0 && request < 4)
  54     data = &ret;
  55
  56 #if __BOUNDED_POINTERS__
  57   switch (request)
  58     {
  59     case PTRACE_PEEKTEXT:
  60     case PTRACE_PEEKDATA:
  61     case PTRACE_PEEKUSER:
  62     case PTRACE_POKETEXT:
  63     case PTRACE_POKEDATA:
  64     case PTRACE_POKEUSER:
  65       (void) CHECK_1 ((int *) addr);
  66       (void) CHECK_1 ((int *) data);
  67       break;
  68
  69     case PTRACE_GETREGS:
  70     case PTRACE_SETREGS:
  71       /* We don't know the size of data, so the best we can do is ensure
  72          that `data' is valid for at least one word.  */
  73       (void) CHECK_1 ((int *) data);
  74       break;
  75
  76     case PTRACE_GETFPREGS:
  77     case PTRACE_SETFPREGS:
  78       /* We don't know the size of data, so the best we can do is ensure
  79          that `data' is valid for at least one word.  */
  80       (void) CHECK_1 ((int *) data);
  81       break;
  82
  83     case PTRACE_GETFPXREGS:
  84     case PTRACE_SETFPXREGS:
  85       /* We don't know the size of data, so the best we can do is ensure
  86          that `data' is valid for at least one word.  */
  87       (void) CHECK_1 ((int *) data);
  88       break;
  89
  90     case PTRACE_TRACEME:
  91     case PTRACE_CONT:
  92     case PTRACE_KILL:
  93     case PTRACE_SINGLESTEP:
  94     case PTRACE_ATTACH:
  95     case PTRACE_DETACH:
  96     case PTRACE_SYSCALL:
  97       /* Neither `data' nor `addr' needs any checks.  */
  98       break;
  99     };
 100 #endif
 101
 102   res = INLINE_SYSCALL (ptrace, 4, request, pid,
 103                         __ptrvalue (addr), __ptrvalue (data));
 104   if (res >= 0 && request > 0 && request < 4)
 105     {
 106       __set_errno (0);
 107       return ret;
 108     }
 109
 110   return res;
 111 }