ptrace-core.c revision 78828
1/* BFD backend for core files which use the ptrace_user structure 2 Copyright 1993, 1994, 1995, 1996, 1998, 1999, 2001 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 68 val = bfd_read ((void *)&u, 1, 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 rawptr = (struct trad_core_struct *) 82 bfd_zalloc (abfd, sizeof (struct trad_core_struct)); 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. This is raunchy, but bfd_close wants to free 92 them separately. */ 93 94 core_stacksec (abfd) = (asection *) bfd_zalloc (abfd, sizeof (asection)); 95 if (core_stacksec (abfd) == NULL) 96 return NULL; 97 core_datasec (abfd) = (asection *) bfd_zalloc (abfd, sizeof (asection)); 98 if (core_datasec (abfd) == NULL) 99 return NULL; 100 core_regsec (abfd) = (asection *) bfd_zalloc (abfd, sizeof (asection)); 101 if (core_regsec (abfd) == NULL) 102 return NULL; 103 104 core_stacksec (abfd)->name = ".stack"; 105 core_datasec (abfd)->name = ".data"; 106 core_regsec (abfd)->name = ".reg"; 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_stacksec (abfd)->flags = SEC_ALLOC + SEC_LOAD + SEC_HAS_CONTENTS; 113 core_datasec (abfd)->flags = SEC_ALLOC + SEC_LOAD + SEC_HAS_CONTENTS; 114 core_regsec (abfd)->flags = SEC_HAS_CONTENTS; 115 116 core_datasec (abfd)->_raw_size = u.pt_dsize; 117 core_stacksec (abfd)->_raw_size = u.pt_ssize; 118 core_regsec (abfd)->_raw_size = sizeof (u); 119 120 core_datasec (abfd)->vma = u.pt_o_data_start; 121 core_stacksec (abfd)->vma = USRSTACK - u.pt_ssize; 122 core_regsec (abfd)->vma = 0 - sizeof (u); /* see trad-core.c */ 123 124 core_datasec (abfd)->filepos = (int) u.pt_dataptr; 125 core_stacksec (abfd)->filepos = (int) (u.pt_dataptr + u.pt_dsize); 126 core_regsec (abfd)->filepos = 0; /* Register segment is ptrace_user */ 127 128 /* Align to word at least */ 129 core_stacksec (abfd)->alignment_power = 2; 130 core_datasec (abfd)->alignment_power = 2; 131 core_regsec (abfd)->alignment_power = 2; 132 133 abfd->sections = core_stacksec (abfd); 134 core_stacksec (abfd)->next = core_datasec (abfd); 135 core_datasec (abfd)->next = core_regsec (abfd); 136 abfd->section_count = 3; 137 138 return abfd->xvec; 139} 140 141char * 142ptrace_unix_core_file_failing_command (abfd) 143 bfd *abfd; 144{ 145 char *com = abfd->tdata.trad_core_data->u.pt_comm; 146 if (*com) 147 return com; 148 else 149 return 0; 150} 151 152/* ARGSUSED */ 153int 154ptrace_unix_core_file_failing_signal (abfd) 155 bfd *abfd; 156{ 157 return abfd->tdata.trad_core_data->u.pt_sigframe.sig_num; 158} 159 160/* ARGSUSED */ 161boolean 162ptrace_unix_core_file_matches_executable_p (core_bfd, exec_bfd) 163 bfd *core_bfd, *exec_bfd; 164{ 165 /* FIXME: Use pt_timdat field of the ptrace_user structure to match 166 the date of the executable */ 167 return true; 168} 169 170/* If somebody calls any byte-swapping routines, shoot them. */ 171static void 172swap_abort () 173{ 174 abort (); /* This way doesn't require any declaration for ANSI to fuck up */ 175} 176#define NO_GET ((bfd_vma (*) PARAMS (( const bfd_byte *))) swap_abort ) 177#define NO_PUT ((void (*) PARAMS ((bfd_vma, bfd_byte *))) swap_abort ) 178#define NO_SIGNED_GET \ 179 ((bfd_signed_vma (*) PARAMS ((const bfd_byte *))) swap_abort ) 180 181const bfd_target ptrace_core_vec = 182 { 183 "trad-core", 184 bfd_target_unknown_flavour, 185 BFD_ENDIAN_UNKNOWN, /* target byte order */ 186 BFD_ENDIAN_UNKNOWN, /* target headers byte order */ 187 (HAS_RELOC | EXEC_P | /* object flags */ 188 HAS_LINENO | HAS_DEBUG | 189 HAS_SYMS | HAS_LOCALS | WP_TEXT | D_PAGED), 190 (SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_RELOC), /* section flags */ 191 0, /* symbol prefix */ 192 ' ', /* ar_pad_char */ 193 16, /* ar_max_namelen */ 194 NO_GET, NO_SIGNED_GET, NO_PUT, /* 64 bit data */ 195 NO_GET, NO_SIGNED_GET, NO_PUT, /* 32 bit data */ 196 NO_GET, NO_SIGNED_GET, NO_PUT, /* 16 bit data */ 197 NO_GET, NO_SIGNED_GET, NO_PUT, /* 64 bit hdrs */ 198 NO_GET, NO_SIGNED_GET, NO_PUT, /* 32 bit hdrs */ 199 NO_GET, NO_SIGNED_GET, NO_PUT, /* 16 bit hdrs */ 200 201 { /* bfd_check_format */ 202 _bfd_dummy_target, /* unknown format */ 203 _bfd_dummy_target, /* object file */ 204 _bfd_dummy_target, /* archive */ 205 ptrace_unix_core_file_p /* a core file */ 206 }, 207 { /* bfd_set_format */ 208 bfd_false, bfd_false, 209 bfd_false, bfd_false 210 }, 211 { /* bfd_write_contents */ 212 bfd_false, bfd_false, 213 bfd_false, bfd_false 214 }, 215 216 BFD_JUMP_TABLE_GENERIC (_bfd_generic), 217 BFD_JUMP_TABLE_COPY (_bfd_generic), 218 BFD_JUMP_TABLE_CORE (ptrace_unix), 219 BFD_JUMP_TABLE_ARCHIVE (_bfd_noarchive), 220 BFD_JUMP_TABLE_SYMBOLS (_bfd_nosymbols), 221 BFD_JUMP_TABLE_RELOCS (_bfd_norelocs), 222 BFD_JUMP_TABLE_WRITE (_bfd_generic), 223 BFD_JUMP_TABLE_LINK (_bfd_nolink), 224 BFD_JUMP_TABLE_DYNAMIC (_bfd_nodynamic), 225 226 NULL, 227 228 (PTR) 0 /* backend_data */ 229}; 230 231#endif /* PTRACE_CORE */ 232