1/* BFD backend for core files which use the ptrace_user structure 2 Copyright (C) 1993-2017 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 8 This file is part of BFD, the Binary File Descriptor library. 9 10 This program is free software; you can redistribute it and/or modify 11 it under the terms of the GNU General Public License as published by 12 the Free Software Foundation; either version 3 of the License, or 13 (at your option) any later version. 14 15 This program is distributed in the hope that it will be useful, 16 but WITHOUT ANY WARRANTY; without even the implied warranty of 17 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 18 GNU General Public License for more details. 19 20 You should have received a copy of the GNU General Public License 21 along with this program; if not, write to the Free Software 22 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, 23 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 (bfd *abfd); 52char * ptrace_unix_core_file_failing_command (bfd *abfd); 53int ptrace_unix_core_file_failing_signal (bfd *abfd); 54#define ptrace_unix_core_file_matches_executable_p generic_core_file_matches_executable_p 55#define ptrace_unix_core_file_pid _bfd_nocore_core_file_pid 56static void swap_abort (void); 57 58const bfd_target * 59ptrace_unix_core_file_p (bfd *abfd) 60{ 61 int val; 62 struct ptrace_user u; 63 struct trad_core_struct *rawptr; 64 bfd_size_type amt; 65 flagword flags; 66 67 val = bfd_bread ((void *)&u, (bfd_size_type) 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 amt = sizeof (struct trad_core_struct); 81 rawptr = (struct trad_core_struct *) bfd_zalloc (abfd, amt); 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. */ 91 92 flags = SEC_ALLOC + SEC_LOAD + SEC_HAS_CONTENTS; 93 core_stacksec (abfd) = bfd_make_section_anyway_with_flags (abfd, ".stack", 94 flags); 95 if (core_stacksec (abfd) == NULL) 96 goto fail; 97 core_datasec (abfd) = bfd_make_section_anyway_with_flags (abfd, ".data", 98 flags); 99 if (core_datasec (abfd) == NULL) 100 goto fail; 101 core_regsec (abfd) = bfd_make_section_anyway_with_flags (abfd, ".reg", 102 SEC_HAS_CONTENTS); 103 if (core_regsec (abfd) == NULL) 104 goto fail; 105 106 /* FIXME: Need to worry about shared memory, library data, and library 107 text. I don't think that any of these things are supported on the 108 system on which I am developing this for though. */ 109 110 core_datasec (abfd)->size = u.pt_dsize; 111 core_stacksec (abfd)->size = u.pt_ssize; 112 core_regsec (abfd)->size = sizeof (u); 113 114 core_datasec (abfd)->vma = u.pt_o_data_start; 115 core_stacksec (abfd)->vma = USRSTACK - u.pt_ssize; 116 core_regsec (abfd)->vma = 0 - sizeof (u); /* see trad-core.c */ 117 118 core_datasec (abfd)->filepos = (int) u.pt_dataptr; 119 core_stacksec (abfd)->filepos = (int) (u.pt_dataptr + u.pt_dsize); 120 core_regsec (abfd)->filepos = 0; /* Register segment is ptrace_user */ 121 122 /* Align to word at least */ 123 core_stacksec (abfd)->alignment_power = 2; 124 core_datasec (abfd)->alignment_power = 2; 125 core_regsec (abfd)->alignment_power = 2; 126 127 return abfd->xvec; 128 129 fail: 130 bfd_release (abfd, abfd->tdata.any); 131 abfd->tdata.any = NULL; 132 bfd_section_list_clear (abfd); 133 return NULL; 134} 135 136char * 137ptrace_unix_core_file_failing_command (bfd *abfd) 138{ 139 char *com = abfd->tdata.trad_core_data->u.pt_comm; 140 141 if (*com) 142 return com; 143 else 144 return 0; 145} 146 147int 148ptrace_unix_core_file_failing_signal (bfd *abfd) 149{ 150 return abfd->tdata.trad_core_data->u.pt_sigframe.sig_num; 151} 152 153/* If somebody calls any byte-swapping routines, shoot them. */ 154static void 155swap_abort (void) 156{ 157 abort (); /* This way doesn't require any declaration for ANSI to fuck up */ 158} 159 160#define NO_GET ((bfd_vma (*) (const void *)) swap_abort) 161#define NO_PUT ((void (*) (bfd_vma, void *)) swap_abort) 162#define NO_GETS ((bfd_signed_vma (*) (const void *)) swap_abort) 163#define NO_GET64 ((bfd_uint64_t (*) (const void *)) swap_abort) 164#define NO_PUT64 ((void (*) (bfd_uint64_t, void *)) swap_abort) 165#define NO_GETS64 ((bfd_int64_t (*) (const void *)) swap_abort) 166 167const bfd_target core_ptrace_vec = 168 { 169 "trad-core", 170 bfd_target_unknown_flavour, 171 BFD_ENDIAN_UNKNOWN, /* target byte order */ 172 BFD_ENDIAN_UNKNOWN, /* target headers byte order */ 173 (HAS_RELOC | EXEC_P | /* object flags */ 174 HAS_LINENO | HAS_DEBUG | 175 HAS_SYMS | HAS_LOCALS | WP_TEXT | D_PAGED), 176 (SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_RELOC), /* section flags */ 177 0, /* symbol prefix */ 178 ' ', /* ar_pad_char */ 179 16, /* ar_max_namelen */ 180 NO_GET64, NO_GETS64, NO_PUT64, /* 64 bit data */ 181 NO_GET, NO_GETS, NO_PUT, /* 32 bit data */ 182 NO_GET, NO_GETS, NO_PUT, /* 16 bit data */ 183 NO_GET64, NO_GETS64, NO_PUT64, /* 64 bit hdrs */ 184 NO_GET, NO_GETS, NO_PUT, /* 32 bit hdrs */ 185 NO_GET, NO_GETS, NO_PUT, /* 16 bit hdrs */ 186 187 { /* bfd_check_format */ 188 _bfd_dummy_target, /* unknown format */ 189 _bfd_dummy_target, /* object file */ 190 _bfd_dummy_target, /* archive */ 191 ptrace_unix_core_file_p /* a core file */ 192 }, 193 { /* bfd_set_format */ 194 bfd_false, bfd_false, 195 bfd_false, bfd_false 196 }, 197 { /* bfd_write_contents */ 198 bfd_false, bfd_false, 199 bfd_false, bfd_false 200 }, 201 202 BFD_JUMP_TABLE_GENERIC (_bfd_generic), 203 BFD_JUMP_TABLE_COPY (_bfd_generic), 204 BFD_JUMP_TABLE_CORE (ptrace_unix), 205 BFD_JUMP_TABLE_ARCHIVE (_bfd_noarchive), 206 BFD_JUMP_TABLE_SYMBOLS (_bfd_nosymbols), 207 BFD_JUMP_TABLE_RELOCS (_bfd_norelocs), 208 BFD_JUMP_TABLE_WRITE (_bfd_generic), 209 BFD_JUMP_TABLE_LINK (_bfd_nolink), 210 BFD_JUMP_TABLE_DYNAMIC (_bfd_nodynamic), 211 212 NULL, 213 214 NULL /* backend_data */ 215 }; 216 217#endif /* PTRACE_CORE */ 218