ptrace-core.c revision 89857
1/* BFD backend for core files which use the ptrace_user structure 2 Copyright 1993, 1994, 1995, 1996, 1998, 1999, 2001, 2002 3 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ 24 25#ifdef PTRACE_CORE 26 27#include "bfd.h" 28#include "sysdep.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)); 54boolean ptrace_unix_core_file_matches_executable_p 55 PARAMS ((bfd *core_bfd, bfd *exec_bfd)); 56static void swap_abort PARAMS ((void)); 57 58/* ARGSUSED */ 59const bfd_target * 60ptrace_unix_core_file_p (abfd) 61 bfd *abfd; 62 63{ 64 int val; 65 struct ptrace_user u; 66 struct trad_core_struct *rawptr; 67 bfd_size_type amt; 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 core_stacksec (abfd) = bfd_make_section_anyway (abfd, ".stack"); 95 if (core_stacksec (abfd) == NULL) 96 goto fail; 97 core_datasec (abfd) = bfd_make_section_anyway (abfd, ".data"); 98 if (core_datasec (abfd) == NULL) 99 goto fail; 100 core_regsec (abfd) = bfd_make_section_anyway (abfd, ".reg"); 101 if (core_regsec (abfd) == NULL) 102 goto fail; 103 104 /* FIXME: Need to worry about shared memory, library data, and library 105 text. I don't think that any of these things are supported on the 106 system on which I am developing this for though. */ 107 108 core_stacksec (abfd)->flags = SEC_ALLOC + SEC_LOAD + SEC_HAS_CONTENTS; 109 core_datasec (abfd)->flags = SEC_ALLOC + SEC_LOAD + SEC_HAS_CONTENTS; 110 core_regsec (abfd)->flags = SEC_HAS_CONTENTS; 111 112 core_datasec (abfd)->_raw_size = u.pt_dsize; 113 core_stacksec (abfd)->_raw_size = u.pt_ssize; 114 core_regsec (abfd)->_raw_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 138char * 139ptrace_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/* ARGSUSED */ 150int 151ptrace_unix_core_file_failing_signal (abfd) 152 bfd *abfd; 153{ 154 return abfd->tdata.trad_core_data->u.pt_sigframe.sig_num; 155} 156 157/* ARGSUSED */ 158boolean 159ptrace_unix_core_file_matches_executable_p (core_bfd, exec_bfd) 160 bfd *core_bfd, *exec_bfd; 161{ 162 /* FIXME: Use pt_timdat field of the ptrace_user structure to match 163 the date of the executable */ 164 return true; 165} 166 167/* If somebody calls any byte-swapping routines, shoot them. */ 168static void 169swap_abort () 170{ 171 abort (); /* This way doesn't require any declaration for ANSI to fuck up */ 172} 173#define NO_GET ((bfd_vma (*) PARAMS (( const bfd_byte *))) swap_abort ) 174#define NO_PUT ((void (*) PARAMS ((bfd_vma, bfd_byte *))) swap_abort ) 175#define NO_SIGNED_GET \ 176 ((bfd_signed_vma (*) PARAMS ((const bfd_byte *))) swap_abort ) 177 178const bfd_target ptrace_core_vec = 179 { 180 "trad-core", 181 bfd_target_unknown_flavour, 182 BFD_ENDIAN_UNKNOWN, /* target byte order */ 183 BFD_ENDIAN_UNKNOWN, /* target headers byte order */ 184 (HAS_RELOC | EXEC_P | /* object flags */ 185 HAS_LINENO | HAS_DEBUG | 186 HAS_SYMS | HAS_LOCALS | WP_TEXT | D_PAGED), 187 (SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_RELOC), /* section flags */ 188 0, /* symbol prefix */ 189 ' ', /* ar_pad_char */ 190 16, /* ar_max_namelen */ 191 NO_GET, NO_SIGNED_GET, NO_PUT, /* 64 bit data */ 192 NO_GET, NO_SIGNED_GET, NO_PUT, /* 32 bit data */ 193 NO_GET, NO_SIGNED_GET, NO_PUT, /* 16 bit data */ 194 NO_GET, NO_SIGNED_GET, NO_PUT, /* 64 bit hdrs */ 195 NO_GET, NO_SIGNED_GET, NO_PUT, /* 32 bit hdrs */ 196 NO_GET, NO_SIGNED_GET, NO_PUT, /* 16 bit hdrs */ 197 198 { /* bfd_check_format */ 199 _bfd_dummy_target, /* unknown format */ 200 _bfd_dummy_target, /* object file */ 201 _bfd_dummy_target, /* archive */ 202 ptrace_unix_core_file_p /* a core file */ 203 }, 204 { /* bfd_set_format */ 205 bfd_false, bfd_false, 206 bfd_false, bfd_false 207 }, 208 { /* bfd_write_contents */ 209 bfd_false, bfd_false, 210 bfd_false, bfd_false 211 }, 212 213 BFD_JUMP_TABLE_GENERIC (_bfd_generic), 214 BFD_JUMP_TABLE_COPY (_bfd_generic), 215 BFD_JUMP_TABLE_CORE (ptrace_unix), 216 BFD_JUMP_TABLE_ARCHIVE (_bfd_noarchive), 217 BFD_JUMP_TABLE_SYMBOLS (_bfd_nosymbols), 218 BFD_JUMP_TABLE_RELOCS (_bfd_norelocs), 219 BFD_JUMP_TABLE_WRITE (_bfd_generic), 220 BFD_JUMP_TABLE_LINK (_bfd_nolink), 221 BFD_JUMP_TABLE_DYNAMIC (_bfd_nodynamic), 222 223 NULL, 224 225 (PTR) 0 /* backend_data */ 226}; 227 228#endif /* PTRACE_CORE */ 229