granicus.if.org Git - strace/blob - process.c

   1 /*
   2  * Copyright (c) 1991, 1992 Paul Kranenburg <pk@cs.few.eur.nl>
   3  * Copyright (c) 1993 Branko Lankester <branko@hacktic.nl>
   4  * Copyright (c) 1993, 1994, 1995, 1996 Rick Sladkey <jrs@world.std.com>
   5  * Copyright (c) 1996-1999 Wichert Akkerman <wichert@cistron.nl>
   6  * Copyright (c) 1999 IBM Deutschland Entwicklung GmbH, IBM Corporation
   7  *                     Linux for s390 port by D.J. Barrow
   8  *                    <barrow_dj@mail.yahoo.com,djbarrow@de.ibm.com>
   9  * Copyright (c) 2000 PocketPenguins Inc.  Linux for Hitachi SuperH
  10  *                    port by Greg Banks <gbanks@pocketpenguins.com>
  11  *
  12  * All rights reserved.
  13  *
  14  * Redistribution and use in source and binary forms, with or without
  15  * modification, are permitted provided that the following conditions
  16  * are met:
  17  * 1. Redistributions of source code must retain the above copyright
  18  *    notice, this list of conditions and the following disclaimer.
  19  * 2. Redistributions in binary form must reproduce the above copyright
  20  *    notice, this list of conditions and the following disclaimer in the
  21  *    documentation and/or other materials provided with the distribution.
  22  * 3. The name of the author may not be used to endorse or promote products
  23  *    derived from this software without specific prior written permission.
  24  *
  25  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  26  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  27  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  28  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  29  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  30  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  31  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  32  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  33  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  34  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  35  */
  36
  37 #include "defs.h"
  38
  39 #ifdef HAVE_ELF_H
  40 # include <elf.h>
  41 #endif
  42
  43 #include "xlat/nt_descriptor_types.h"
  44
  45 #include "regs.h"
  46 #include "ptrace.h"
  47 #include "xlat/ptrace_cmds.h"
  48 #include "xlat/ptrace_setoptions_flags.h"
  49
  50 #define uoff(member)    offsetof(struct user, member)
  51 #define XLAT_UOFF(member)       { uoff(member), "offsetof(struct user, " #member ")" }
  52
  53 static const struct xlat struct_user_offsets[] = {
  54 #include "userent.h"
  55         XLAT_END
  56 };
  57
  58 static void
  59 print_user_offset_addr(const unsigned long addr)
  60 {
  61         const struct xlat *x;
  62
  63         for (x = struct_user_offsets; x->str; ++x) {
  64                 if (x->val >= addr)
  65                         break;
  66         }
  67
  68         if (!x->str) {
  69                 printaddr(addr);
  70         } else if (x->val > addr) {
  71                 if (x == struct_user_offsets) {
  72                         printaddr(addr);
  73                 } else {
  74                         --x;
  75                         tprintf("%s + %lu",
  76                                 x->str, addr - (unsigned long) x->val);
  77                 }
  78         } else {
  79                 tprints(x->str);
  80         }
  81 }
  82
  83 SYS_FUNC(ptrace)
  84 {
  85         const unsigned long request = tcp->u_arg[0];
  86         const int pid = tcp->u_arg[1];
  87         const unsigned long addr = tcp->u_arg[2];
  88         const unsigned long data = tcp->u_arg[3];
  89
  90         if (entering(tcp)) {
  91                 /* request */
  92                 printxval64(ptrace_cmds, request, "PTRACE_???");
  93
  94                 if (request == PTRACE_TRACEME) {
  95                         /* pid, addr, and data are ignored. */
  96                         return RVAL_DECODED;
  97                 }
  98
  99                 /* pid */
 100                 tprintf(", %d", pid);
 101
 102                 /* addr */
 103                 switch (request) {
 104                 case PTRACE_ATTACH:
 105                 case PTRACE_INTERRUPT:
 106                 case PTRACE_KILL:
 107                 case PTRACE_LISTEN:
 108                         /* addr and data are ignored */
 109                         return RVAL_DECODED;
 110                 case PTRACE_PEEKUSER:
 111                 case PTRACE_POKEUSER:
 112                         tprints(", ");
 113                         print_user_offset_addr(addr);
 114                         break;
 115                 case PTRACE_GETREGSET:
 116                 case PTRACE_SETREGSET:
 117                         tprints(", ");
 118                         printxval(nt_descriptor_types, addr, "NT_???");
 119                         break;
 120 #if defined SPARC || defined SPARC64
 121                 case PTRACE_GETREGS:
 122                 case PTRACE_SETREGS:
 123                 case PTRACE_GETFPREGS:
 124                 case PTRACE_SETFPREGS:
 125                         tprints(", ");
 126                         printaddr(addr);
 127                         /* data is ignored */
 128                         return RVAL_DECODED;
 129 #endif
 130                 default:
 131                         tprints(", ");
 132                         printaddr(addr);
 133                 }
 134
 135                 tprints(", ");
 136
 137                 /* data */
 138                 switch (request) {
 139 #ifndef IA64
 140                 case PTRACE_PEEKDATA:
 141                 case PTRACE_PEEKTEXT:
 142                 case PTRACE_PEEKUSER:
 143                         break;
 144 #endif
 145                 case PTRACE_CONT:
 146                 case PTRACE_SINGLESTEP:
 147                 case PTRACE_SYSCALL:
 148                 case PTRACE_DETACH:
 149                         printsignal(data);
 150                         break;
 151                 case PTRACE_SETOPTIONS:
 152                         printflags(ptrace_setoptions_flags, data, "PTRACE_O_???");
 153                         break;
 154                 case PTRACE_SETSIGINFO:
 155                         printsiginfo_at(tcp, data);
 156                         break;
 157                 case PTRACE_SETREGSET:
 158                         tprint_iov(tcp, /*len:*/ 1, data, /*as string:*/ 0);
 159                         break;
 160                 case PTRACE_GETSIGINFO:
 161                 case PTRACE_GETREGSET:
 162                         /* Don't print anything, do it at syscall return. */
 163                         break;
 164                 default:
 165                         printaddr(data);
 166                         break;
 167                 }
 168         } else {
 169                 switch (request) {
 170                 case PTRACE_PEEKDATA:
 171                 case PTRACE_PEEKTEXT:
 172                 case PTRACE_PEEKUSER:
 173 #ifdef IA64
 174                         return RVAL_HEX;
 175 #else
 176                         printnum_ptr(tcp, data);
 177                         break;
 178 #endif
 179                 case PTRACE_GETSIGINFO:
 180                         printsiginfo_at(tcp, data);
 181                         break;
 182                 case PTRACE_GETREGSET:
 183                         tprint_iov(tcp, /*len:*/ 1, data, /*as string:*/ 0);
 184                         break;
 185                 }
 186         }
 187         return 0;
 188 }