ptrace-core.c revision 77298
1/* BFD backend for core files which use the ptrace_user structure 2 Copyright 1993, 94, 95, 96, 1998 Free Software Foundation, Inc. 3 The structure of this file is based on trad-core.c written by John Gilmore 4 of Cygnus Support. 5 Modified to work with the ptrace_user structure by Kevin A. Buettner. 6 (Longterm it may be better to merge this file with trad-core.c) 7 8This file is part of BFD, the Binary File Descriptor library. 9 10This program is free software; you can redistribute it and/or modify 11it under the terms of the GNU General Public License as published by 12the Free Software Foundation; either version 2 of the License, or 13(at your option) any later version. 14 15This program is distributed in the hope that it will be useful, 16but WITHOUT ANY WARRANTY; without even the implied warranty of 17MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 18GNU General Public License for more details. 19 20You should have received a copy of the GNU General Public License 21along with this program; if not, write to the Free Software 22Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ 23 24#ifdef PTRACE_CORE 25 26#include "bfd.h" 27#include "sysdep.h" 28#include "libbfd.h" 29 30#include <sys/param.h> 31#include <sys/dir.h> 32#include <signal.h> 33#include <sys/ptrace.h> 34 35struct trad_core_struct 36 { 37 asection *data_section; 38 asection *stack_section; 39 asection *reg_section; 40 struct ptrace_user u; 41 }; 42 43#define core_upage(bfd) (&((bfd)->tdata.trad_core_data->u)) 44#define core_datasec(bfd) ((bfd)->tdata.trad_core_data->data_section) 45#define core_stacksec(bfd) ((bfd)->tdata.trad_core_data->stack_section) 46#define core_regsec(bfd) ((bfd)->tdata.trad_core_data->reg_section) 47 48/* forward declarations */ 49 50const bfd_target *ptrace_unix_core_file_p PARAMS ((bfd *abfd)); 51char * ptrace_unix_core_file_failing_command PARAMS ((bfd *abfd)); 52int ptrace_unix_core_file_failing_signal PARAMS ((bfd *abfd)); 53boolean ptrace_unix_core_file_matches_executable_p 54 PARAMS ((bfd *core_bfd, bfd *exec_bfd)); 55static void swap_abort PARAMS ((void)); 56 57/* ARGSUSED */ 58const bfd_target * 59ptrace_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 67 val = bfd_read ((void *)&u, 1, sizeof u, abfd); 68 if (val != sizeof u || u.pt_magic != _BCS_PTRACE_MAGIC 69 || u.pt_rev != _BCS_PTRACE_REV) 70 { 71 /* Too small to be a core file */ 72 bfd_set_error (bfd_error_wrong_format); 73 return 0; 74 } 75 76 /* OK, we believe you. You're a core file (sure, sure). */ 77 78 /* Allocate both the upage and the struct core_data at once, so 79 a single free() will free them both. */ 80 rawptr = (struct trad_core_struct *) 81 bfd_zalloc (abfd, sizeof (struct trad_core_struct)); 82 83 if (rawptr == NULL) 84 return 0; 85 86 abfd->tdata.trad_core_data = rawptr; 87 88 rawptr->u = u; /*Copy the uarea into the tdata part of the bfd */ 89 90 /* Create the sections. This is raunchy, but bfd_close wants to free 91 them separately. */ 92 93 core_stacksec (abfd) = (asection *) bfd_zalloc (abfd, sizeof (asection)); 94 if (core_stacksec (abfd) == NULL) 95 return NULL; 96 core_datasec (abfd) = (asection *) bfd_zalloc (abfd, sizeof (asection)); 97 if (core_datasec (abfd) == NULL) 98 return NULL; 99 core_regsec (abfd) = (asection *) bfd_zalloc (abfd, sizeof (asection)); 100 if (core_regsec (abfd) == NULL) 101 return NULL; 102 103 core_stacksec (abfd)->name = ".stack"; 104 core_datasec (abfd)->name = ".data"; 105 core_regsec (abfd)->name = ".reg"; 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_stacksec (abfd)->flags = SEC_ALLOC + SEC_LOAD + SEC_HAS_CONTENTS; 112 core_datasec (abfd)->flags = SEC_ALLOC + SEC_LOAD + SEC_HAS_CONTENTS; 113 core_regsec (abfd)->flags = SEC_HAS_CONTENTS; 114 115 core_datasec (abfd)->_raw_size = u.pt_dsize; 116 core_stacksec (abfd)->_raw_size = u.pt_ssize; 117 core_regsec (abfd)->_raw_size = sizeof (u); 118 119 core_datasec (abfd)->vma = u.pt_o_data_start; 120 core_stacksec (abfd)->vma = USRSTACK - u.pt_ssize; 121 core_regsec (abfd)->vma = 0 - sizeof (u); /* see trad-core.c */ 122 123 core_datasec (abfd)->filepos = (int) u.pt_dataptr; 124 core_stacksec (abfd)->filepos = (int) (u.pt_dataptr + u.pt_dsize); 125 core_regsec (abfd)->filepos = 0; /* Register segment is ptrace_user */ 126 127 /* Align to word at least */ 128 core_stacksec (abfd)->alignment_power = 2; 129 core_datasec (abfd)->alignment_power = 2; 130 core_regsec (abfd)->alignment_power = 2; 131 132 abfd->sections = core_stacksec (abfd); 133 core_stacksec (abfd)->next = core_datasec (abfd); 134 core_datasec (abfd)->next = core_regsec (abfd); 135 abfd->section_count = 3; 136 137 return abfd->xvec; 138} 139 140char * 141ptrace_unix_core_file_failing_command (abfd) 142 bfd *abfd; 143{ 144 char *com = abfd->tdata.trad_core_data->u.pt_comm; 145 if (*com) 146 return com; 147 else 148 return 0; 149} 150 151/* ARGSUSED */ 152int 153ptrace_unix_core_file_failing_signal (abfd) 154 bfd *abfd; 155{ 156 return abfd->tdata.trad_core_data->u.pt_sigframe.sig_num; 157} 158 159/* ARGSUSED */ 160boolean 161ptrace_unix_core_file_matches_executable_p (core_bfd, exec_bfd) 162 bfd *core_bfd, *exec_bfd; 163{ 164 /* FIXME: Use pt_timdat field of the ptrace_user structure to match 165 the date of the executable */ 166 return true; 167} 168 169/* If somebody calls any byte-swapping routines, shoot them. */ 170static void 171swap_abort () 172{ 173 abort (); /* This way doesn't require any declaration for ANSI to fuck up */ 174} 175#define NO_GET ((bfd_vma (*) PARAMS (( const bfd_byte *))) swap_abort ) 176#define NO_PUT ((void (*) PARAMS ((bfd_vma, bfd_byte *))) swap_abort ) 177#define NO_SIGNED_GET \ 178 ((bfd_signed_vma (*) PARAMS ((const bfd_byte *))) swap_abort ) 179 180const bfd_target ptrace_core_vec = 181 { 182 "trad-core", 183 bfd_target_unknown_flavour, 184 BFD_ENDIAN_UNKNOWN, /* target byte order */ 185 BFD_ENDIAN_UNKNOWN, /* target headers byte order */ 186 (HAS_RELOC | EXEC_P | /* object flags */ 187 HAS_LINENO | HAS_DEBUG | 188 HAS_SYMS | HAS_LOCALS | WP_TEXT | D_PAGED), 189 (SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_RELOC), /* section flags */ 190 0, /* symbol prefix */ 191 ' ', /* ar_pad_char */ 192 16, /* ar_max_namelen */ 193 NO_GET, NO_SIGNED_GET, NO_PUT, /* 64 bit data */ 194 NO_GET, NO_SIGNED_GET, NO_PUT, /* 32 bit data */ 195 NO_GET, NO_SIGNED_GET, NO_PUT, /* 16 bit data */ 196 NO_GET, NO_SIGNED_GET, NO_PUT, /* 64 bit hdrs */ 197 NO_GET, NO_SIGNED_GET, NO_PUT, /* 32 bit hdrs */ 198 NO_GET, NO_SIGNED_GET, NO_PUT, /* 16 bit hdrs */ 199 200 { /* bfd_check_format */ 201 _bfd_dummy_target, /* unknown format */ 202 _bfd_dummy_target, /* object file */ 203 _bfd_dummy_target, /* archive */ 204 ptrace_unix_core_file_p /* a core file */ 205 }, 206 { /* bfd_set_format */ 207 bfd_false, bfd_false, 208 bfd_false, bfd_false 209 }, 210 { /* bfd_write_contents */ 211 bfd_false, bfd_false, 212 bfd_false, bfd_false 213 }, 214 215 BFD_JUMP_TABLE_GENERIC (_bfd_generic), 216 BFD_JUMP_TABLE_COPY (_bfd_generic), 217 BFD_JUMP_TABLE_CORE (ptrace_unix), 218 BFD_JUMP_TABLE_ARCHIVE (_bfd_noarchive), 219 BFD_JUMP_TABLE_SYMBOLS (_bfd_nosymbols), 220 BFD_JUMP_TABLE_RELOCS (_bfd_norelocs), 221 BFD_JUMP_TABLE_WRITE (_bfd_generic), 222 BFD_JUMP_TABLE_LINK (_bfd_nolink), 223 BFD_JUMP_TABLE_DYNAMIC (_bfd_nodynamic), 224 225 NULL, 226 227 (PTR) 0 /* backend_data */ 228}; 229 230#endif /* PTRACE_CORE */ 231