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 9 This file is part of BFD, the Binary File Descriptor library. 10 11 This program is free software; you can redistribute it and/or modify 12 it under the terms of the GNU General Public License as published by 13 the Free Software Foundation; either version 3 of the License, or 14 (at your option) any later version. 15 16 This program is distributed in the hope that it will be useful, 17 but WITHOUT ANY WARRANTY; without even the implied warranty of 18 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 19 GNU General Public License for more details. 20 21 You should have received a copy of the GNU General Public License 22 along with this program; if not, write to the Free Software 23 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, 24 MA 02110-1301, USA. */ 25 26 #ifdef PTRACE_CORE 27 28 #include "sysdep.h" 29 #include "bfd.h" 30 #include "libbfd.h" 31 32 #include <sys/param.h> 33 #include <sys/dir.h> 34 #include <signal.h> 35 #include <sys/ptrace.h> 36 37 struct trad_core_struct 38 { 39 asection *data_section; 40 asection *stack_section; 41 asection *reg_section; 42 struct ptrace_user u; 43 }; 44 45 #define core_upage(bfd) (&((bfd)->tdata.trad_core_data->u)) 46 #define core_datasec(bfd) ((bfd)->tdata.trad_core_data->data_section) 47 #define core_stacksec(bfd) ((bfd)->tdata.trad_core_data->stack_section) 48 #define core_regsec(bfd) ((bfd)->tdata.trad_core_data->reg_section) 49 50 /* forward declarations */ 51 52 const bfd_target *ptrace_unix_core_file_p PARAMS ((bfd *abfd)); 53 char * ptrace_unix_core_file_failing_command PARAMS ((bfd *abfd)); 54 int ptrace_unix_core_file_failing_signal PARAMS ((bfd *abfd)); 55 #define ptrace_unix_core_file_matches_executable_p generic_core_file_matches_executable_p 56 static void swap_abort PARAMS ((void)); 57 58 const bfd_target * 59 ptrace_unix_core_file_p (abfd) 60 bfd *abfd; 61 62 { 63 int val; 64 struct ptrace_user u; 65 struct trad_core_struct *rawptr; 66 bfd_size_type amt; 67 flagword flags; 68 69 val = bfd_bread ((void *)&u, (bfd_size_type) sizeof u, abfd); 70 if (val != sizeof u || u.pt_magic != _BCS_PTRACE_MAGIC 71 || u.pt_rev != _BCS_PTRACE_REV) 72 { 73 /* Too small to be a core file */ 74 bfd_set_error (bfd_error_wrong_format); 75 return 0; 76 } 77 78 /* OK, we believe you. You're a core file (sure, sure). */ 79 80 /* Allocate both the upage and the struct core_data at once, so 81 a single free() will free them both. */ 82 amt = sizeof (struct trad_core_struct); 83 rawptr = (struct trad_core_struct *) bfd_zalloc (abfd, amt); 84 85 if (rawptr == NULL) 86 return 0; 87 88 abfd->tdata.trad_core_data = rawptr; 89 90 rawptr->u = u; /*Copy the uarea into the tdata part of the bfd */ 91 92 /* Create the sections. */ 93 94 flags = SEC_ALLOC + SEC_LOAD + SEC_HAS_CONTENTS; 95 core_stacksec (abfd) = bfd_make_section_anyway_with_flags (abfd, ".stack", 96 flags); 97 if (core_stacksec (abfd) == NULL) 98 goto fail; 99 core_datasec (abfd) = bfd_make_section_anyway_with_flags (abfd, ".data", 100 flags); 101 if (core_datasec (abfd) == NULL) 102 goto fail; 103 core_regsec (abfd) = bfd_make_section_anyway_with_flags (abfd, ".reg", 104 SEC_HAS_CONTENTS); 105 if (core_regsec (abfd) == NULL) 106 goto fail; 107 108 /* FIXME: Need to worry about shared memory, library data, and library 109 text. I don't think that any of these things are supported on the 110 system on which I am developing this for though. */ 111 112 core_datasec (abfd)->size = u.pt_dsize; 113 core_stacksec (abfd)->size = u.pt_ssize; 114 core_regsec (abfd)->size = sizeof (u); 115 116 core_datasec (abfd)->vma = u.pt_o_data_start; 117 core_stacksec (abfd)->vma = USRSTACK - u.pt_ssize; 118 core_regsec (abfd)->vma = 0 - sizeof (u); /* see trad-core.c */ 119 120 core_datasec (abfd)->filepos = (int) u.pt_dataptr; 121 core_stacksec (abfd)->filepos = (int) (u.pt_dataptr + u.pt_dsize); 122 core_regsec (abfd)->filepos = 0; /* Register segment is ptrace_user */ 123 124 /* Align to word at least */ 125 core_stacksec (abfd)->alignment_power = 2; 126 core_datasec (abfd)->alignment_power = 2; 127 core_regsec (abfd)->alignment_power = 2; 128 129 return abfd->xvec; 130 131 fail: 132 bfd_release (abfd, abfd->tdata.any); 133 abfd->tdata.any = NULL; 134 bfd_section_list_clear (abfd); 135 return NULL; 136 } 137 138 char * 139 ptrace_unix_core_file_failing_command (abfd) 140 bfd *abfd; 141 { 142 char *com = abfd->tdata.trad_core_data->u.pt_comm; 143 if (*com) 144 return com; 145 else 146 return 0; 147 } 148 149 int 150 ptrace_unix_core_file_failing_signal (abfd) 151 bfd *abfd; 152 { 153 return abfd->tdata.trad_core_data->u.pt_sigframe.sig_num; 154 } 155 156 /* If somebody calls any byte-swapping routines, shoot them. */ 157 static void 158 swap_abort () 159 { 160 abort (); /* This way doesn't require any declaration for ANSI to fuck up */ 161 } 162 163 #define NO_GET ((bfd_vma (*) (const void *)) swap_abort) 164 #define NO_PUT ((void (*) (bfd_vma, void *)) swap_abort) 165 #define NO_GETS ((bfd_signed_vma (*) (const void *)) swap_abort) 166 #define NO_GET64 ((bfd_uint64_t (*) (const void *)) swap_abort) 167 #define NO_PUT64 ((void (*) (bfd_uint64_t, void *)) swap_abort) 168 #define NO_GETS64 ((bfd_int64_t (*) (const void *)) swap_abort) 169 170 const bfd_target ptrace_core_vec = 171 { 172 "trad-core", 173 bfd_target_unknown_flavour, 174 BFD_ENDIAN_UNKNOWN, /* target byte order */ 175 BFD_ENDIAN_UNKNOWN, /* target headers byte order */ 176 (HAS_RELOC | EXEC_P | /* object flags */ 177 HAS_LINENO | HAS_DEBUG | 178 HAS_SYMS | HAS_LOCALS | WP_TEXT | D_PAGED), 179 (SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_RELOC), /* section flags */ 180 0, /* symbol prefix */ 181 ' ', /* ar_pad_char */ 182 16, /* ar_max_namelen */ 183 NO_GET64, NO_GETS64, NO_PUT64, /* 64 bit data */ 184 NO_GET, NO_GETS, NO_PUT, /* 32 bit data */ 185 NO_GET, NO_GETS, NO_PUT, /* 16 bit data */ 186 NO_GET64, NO_GETS64, NO_PUT64, /* 64 bit hdrs */ 187 NO_GET, NO_GETS, NO_PUT, /* 32 bit hdrs */ 188 NO_GET, NO_GETS, NO_PUT, /* 16 bit hdrs */ 189 190 { /* bfd_check_format */ 191 _bfd_dummy_target, /* unknown format */ 192 _bfd_dummy_target, /* object file */ 193 _bfd_dummy_target, /* archive */ 194 ptrace_unix_core_file_p /* a core file */ 195 }, 196 { /* bfd_set_format */ 197 bfd_false, bfd_false, 198 bfd_false, bfd_false 199 }, 200 { /* bfd_write_contents */ 201 bfd_false, bfd_false, 202 bfd_false, bfd_false 203 }, 204 205 BFD_JUMP_TABLE_GENERIC (_bfd_generic), 206 BFD_JUMP_TABLE_COPY (_bfd_generic), 207 BFD_JUMP_TABLE_CORE (ptrace_unix), 208 BFD_JUMP_TABLE_ARCHIVE (_bfd_noarchive), 209 BFD_JUMP_TABLE_SYMBOLS (_bfd_nosymbols), 210 BFD_JUMP_TABLE_RELOCS (_bfd_norelocs), 211 BFD_JUMP_TABLE_WRITE (_bfd_generic), 212 BFD_JUMP_TABLE_LINK (_bfd_nolink), 213 BFD_JUMP_TABLE_DYNAMIC (_bfd_nodynamic), 214 215 NULL, 216 217 (PTR) 0 /* backend_data */ 218 }; 219 220 #endif /* PTRACE_CORE */ 221