| 1 | /* BFD backend for core files which use the ptrace_user structure |
| 2 | Copyright (C) 1993-2020 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 | |
| 36 | struct 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 | |
| 51 | const bfd_target *ptrace_unix_core_file_p (bfd *abfd); |
| 52 | char * ptrace_unix_core_file_failing_command (bfd *abfd); |
| 53 | int 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 |
| 56 | static void swap_abort (void); |
| 57 | |
| 58 | bfd_cleanup |
| 59 | ptrace_unix_core_file_p (bfd *abfd) |
| 60 | { |
| 61 | int val; |
| 62 | struct ptrace_user u; |
| 63 | struct trad_core_struct *rawptr; |
| 64 | size_t 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 _bfd_no_cleanup; |
| 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 | |
| 136 | char * |
| 137 | ptrace_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 | |
| 147 | int |
| 148 | ptrace_unix_core_file_failing_signal (bfd *abfd) |
| 149 | { |
| 150 | return abfd->tdata.trad_core_data->u.pt_sigframe.sig_num; |
| 151 | } |
| 152 | \f |
| 153 | /* If somebody calls any byte-swapping routines, shoot them. */ |
| 154 | static void |
| 155 | swap_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 | |
| 167 | const 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_bool_bfd_false_error, bfd_false, |
| 195 | _bfd_bool_bfd_false_error, bfd_false |
| 196 | }, |
| 197 | { /* bfd_write_contents */ |
| 198 | _bfd_bool_bfd_false_error, bfd_false, |
| 199 | _bfd_bool_bfd_false_error, 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 */ |