ptrace-core.c revision 302408
1/* BFD backend for core files which use the ptrace_user structure 2 Copyright 1993, 1994, 1995, 1996, 1998, 1999, 2001, 2002, 2003, 2004, 3 2006, 2007 Free Software Foundation, Inc. 4 The structure of this file is based on trad-core.c written by John Gilmore 5 of Cygnus Support. 6 Modified to work with the ptrace_user structure by Kevin A. Buettner. 7 (Longterm it may be better to merge this file with trad-core.c) 8 9This file is part of BFD, the Binary File Descriptor library. 10 11This program is free software; you can redistribute it and/or modify 12it under the terms of the GNU General Public License as published by 13the Free Software Foundation; either version 2 of the License, or 14(at your option) any later version. 15 16This program is distributed in the hope that it will be useful, 17but WITHOUT ANY WARRANTY; without even the implied warranty of 18MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 19GNU General Public License for more details. 20 21You should have received a copy of the GNU General Public License 22along with this program; if not, write to the Free Software 23Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA. */ 24 25#ifdef PTRACE_CORE 26 27#include "sysdep.h" 28#include "bfd.h" 29#include "libbfd.h" 30 31#include <sys/param.h> 32#include <sys/dir.h> 33#include <signal.h> 34#include <sys/ptrace.h> 35 36struct trad_core_struct 37 { 38 asection *data_section; 39 asection *stack_section; 40 asection *reg_section; 41 struct ptrace_user u; 42 }; 43 44#define core_upage(bfd) (&((bfd)->tdata.trad_core_data->u)) 45#define core_datasec(bfd) ((bfd)->tdata.trad_core_data->data_section) 46#define core_stacksec(bfd) ((bfd)->tdata.trad_core_data->stack_section) 47#define core_regsec(bfd) ((bfd)->tdata.trad_core_data->reg_section) 48 49/* forward declarations */ 50 51const bfd_target *ptrace_unix_core_file_p PARAMS ((bfd *abfd)); 52char * ptrace_unix_core_file_failing_command PARAMS ((bfd *abfd)); 53int ptrace_unix_core_file_failing_signal PARAMS ((bfd *abfd)); 54#define ptrace_unix_core_file_matches_executable_p generic_core_file_matches_executable_p 55static void swap_abort PARAMS ((void)); 56 57const bfd_target * 58ptrace_unix_core_file_p (abfd) 59 bfd *abfd; 60 61{ 62 int val; 63 struct ptrace_user u; 64 struct trad_core_struct *rawptr; 65 bfd_size_type amt; 66 flagword flags; 67 68 val = bfd_bread ((void *)&u, (bfd_size_type) sizeof u, abfd); 69 if (val != sizeof u || u.pt_magic != _BCS_PTRACE_MAGIC 70 || u.pt_rev != _BCS_PTRACE_REV) 71 { 72 /* Too small to be a core file */ 73 bfd_set_error (bfd_error_wrong_format); 74 return 0; 75 } 76 77 /* OK, we believe you. You're a core file (sure, sure). */ 78 79 /* Allocate both the upage and the struct core_data at once, so 80 a single free() will free them both. */ 81 amt = sizeof (struct trad_core_struct); 82 rawptr = (struct trad_core_struct *) bfd_zalloc (abfd, amt); 83 84 if (rawptr == NULL) 85 return 0; 86 87 abfd->tdata.trad_core_data = rawptr; 88 89 rawptr->u = u; /*Copy the uarea into the tdata part of the bfd */ 90 91 /* Create the sections. */ 92 93 flags = SEC_ALLOC + SEC_LOAD + SEC_HAS_CONTENTS; 94 core_stacksec (abfd) = bfd_make_section_anyway_with_flags (abfd, ".stack", 95 flags); 96 if (core_stacksec (abfd) == NULL) 97 goto fail; 98 core_datasec (abfd) = bfd_make_section_anyway_with_flags (abfd, ".data", 99 flags); 100 if (core_datasec (abfd) == NULL) 101 goto fail; 102 core_regsec (abfd) = bfd_make_section_anyway_with_flags (abfd, ".reg", 103 SEC_HAS_CONTENTS); 104 if (core_regsec (abfd) == NULL) 105 goto fail; 106 107 /* FIXME: Need to worry about shared memory, library data, and library 108 text. I don't think that any of these things are supported on the 109 system on which I am developing this for though. */ 110 111 core_datasec (abfd)->size = u.pt_dsize; 112 core_stacksec (abfd)->size = u.pt_ssize; 113 core_regsec (abfd)->size = sizeof (u); 114 115 core_datasec (abfd)->vma = u.pt_o_data_start; 116 core_stacksec (abfd)->vma = USRSTACK - u.pt_ssize; 117 core_regsec (abfd)->vma = 0 - sizeof (u); /* see trad-core.c */ 118 119 core_datasec (abfd)->filepos = (int) u.pt_dataptr; 120 core_stacksec (abfd)->filepos = (int) (u.pt_dataptr + u.pt_dsize); 121 core_regsec (abfd)->filepos = 0; /* Register segment is ptrace_user */ 122 123 /* Align to word at least */ 124 core_stacksec (abfd)->alignment_power = 2; 125 core_datasec (abfd)->alignment_power = 2; 126 core_regsec (abfd)->alignment_power = 2; 127 128 return abfd->xvec; 129 130 fail: 131 bfd_release (abfd, abfd->tdata.any); 132 abfd->tdata.any = NULL; 133 bfd_section_list_clear (abfd); 134 return NULL; 135} 136 137char * 138ptrace_unix_core_file_failing_command (abfd) 139 bfd *abfd; 140{ 141 char *com = abfd->tdata.trad_core_data->u.pt_comm; 142 if (*com) 143 return com; 144 else 145 return 0; 146} 147 148int 149ptrace_unix_core_file_failing_signal (abfd) 150 bfd *abfd; 151{ 152 return abfd->tdata.trad_core_data->u.pt_sigframe.sig_num; 153} 154 155/* If somebody calls any byte-swapping routines, shoot them. */ 156static void 157swap_abort () 158{ 159 abort (); /* This way doesn't require any declaration for ANSI to fuck up */ 160} 161 162#define NO_GET ((bfd_vma (*) (const void *)) swap_abort) 163#define NO_PUT ((void (*) (bfd_vma, void *)) swap_abort) 164#define NO_GETS ((bfd_signed_vma (*) (const void *)) swap_abort) 165#define NO_GET64 ((bfd_uint64_t (*) (const void *)) swap_abort) 166#define NO_PUT64 ((void (*) (bfd_uint64_t, void *)) swap_abort) 167#define NO_GETS64 ((bfd_int64_t (*) (const void *)) swap_abort) 168 169const bfd_target ptrace_core_vec = 170 { 171 "trad-core", 172 bfd_target_unknown_flavour, 173 BFD_ENDIAN_UNKNOWN, /* target byte order */ 174 BFD_ENDIAN_UNKNOWN, /* target headers byte order */ 175 (HAS_RELOC | EXEC_P | /* object flags */ 176 HAS_LINENO | HAS_DEBUG | 177 HAS_SYMS | HAS_LOCALS | WP_TEXT | D_PAGED), 178 (SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_RELOC), /* section flags */ 179 0, /* symbol prefix */ 180 ' ', /* ar_pad_char */ 181 16, /* ar_max_namelen */ 182 NO_GET64, NO_GETS64, NO_PUT64, /* 64 bit data */ 183 NO_GET, NO_GETS, NO_PUT, /* 32 bit data */ 184 NO_GET, NO_GETS, NO_PUT, /* 16 bit data */ 185 NO_GET64, NO_GETS64, NO_PUT64, /* 64 bit hdrs */ 186 NO_GET, NO_GETS, NO_PUT, /* 32 bit hdrs */ 187 NO_GET, NO_GETS, NO_PUT, /* 16 bit hdrs */ 188 189 { /* bfd_check_format */ 190 _bfd_dummy_target, /* unknown format */ 191 _bfd_dummy_target, /* object file */ 192 _bfd_dummy_target, /* archive */ 193 ptrace_unix_core_file_p /* a core file */ 194 }, 195 { /* bfd_set_format */ 196 bfd_false, bfd_false, 197 bfd_false, bfd_false 198 }, 199 { /* bfd_write_contents */ 200 bfd_false, bfd_false, 201 bfd_false, bfd_false 202 }, 203 204 BFD_JUMP_TABLE_GENERIC (_bfd_generic), 205 BFD_JUMP_TABLE_COPY (_bfd_generic), 206 BFD_JUMP_TABLE_CORE (ptrace_unix), 207 BFD_JUMP_TABLE_ARCHIVE (_bfd_noarchive), 208 BFD_JUMP_TABLE_SYMBOLS (_bfd_nosymbols), 209 BFD_JUMP_TABLE_RELOCS (_bfd_norelocs), 210 BFD_JUMP_TABLE_WRITE (_bfd_generic), 211 BFD_JUMP_TABLE_LINK (_bfd_nolink), 212 BFD_JUMP_TABLE_DYNAMIC (_bfd_nodynamic), 213 214 NULL, 215 216 (PTR) 0 /* backend_data */ 217 }; 218 219#endif /* PTRACE_CORE */ 220