| 1 | /* BFD back-end for a.out files encapsulated with COFF headers. |
| 2 | Copyright 1990, 1991, 1994, 1995, 2000, 2001 |
| 3 | Free Software Foundation, Inc. |
| 4 | |
| 5 | This file is part of BFD, the Binary File Descriptor library. |
| 6 | |
| 7 | This program is free software; you can redistribute it and/or modify |
| 8 | it under the terms of the GNU General Public License as published by |
| 9 | the Free Software Foundation; either version 2 of the License, or |
| 10 | (at your option) any later version. |
| 11 | |
| 12 | This program is distributed in the hope that it will be useful, |
| 13 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 15 | GNU General Public License for more details. |
| 16 | |
| 17 | You should have received a copy of the GNU General Public License |
| 18 | along with this program; if not, write to the Free Software |
| 19 | Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ |
| 20 | |
| 21 | /* THIS MODULE IS NOT FINISHED. IT PROBABLY DOESN'T EVEN COMPILE. */ |
| 22 | |
| 23 | #if 0 |
| 24 | #define TARGET_PAGE_SIZE 4096 |
| 25 | #define SEGMENT_SIZE TARGET_PAGE_SIZE |
| 26 | #define TEXT_START_ADDR 0 |
| 27 | #define BYTES_IN_WORD 4 |
| 28 | #endif |
| 29 | |
| 30 | #include "bfd.h" |
| 31 | #include "sysdep.h" |
| 32 | #include "libbfd.h" |
| 33 | #include "aout/aout64.h" |
| 34 | #include "aout/stab_gnu.h" |
| 35 | #include "aout/ar.h" |
| 36 | #include "libaout.h" /* BFD a.out internal data structures */ |
| 37 | |
| 38 | const bfd_target *encap_real_callback (); |
| 39 | |
| 40 | const bfd_target * |
| 41 | encap_object_p (abfd) |
| 42 | bfd *abfd; |
| 43 | { |
| 44 | unsigned char magicbuf[4]; /* Raw bytes of magic number from file */ |
| 45 | unsigned long magic; /* Swapped magic number */ |
| 46 | short coff_magic; |
| 47 | struct external_exec exec_bytes; |
| 48 | struct internal_exec exec; |
| 49 | bfd_size_type amt = sizeof (magicbuf); |
| 50 | |
| 51 | if (bfd_bread ((PTR) magicbuf, amt, abfd) != amt) |
| 52 | { |
| 53 | if (bfd_get_error () != bfd_error_system_call) |
| 54 | bfd_set_error (bfd_error_wrong_format); |
| 55 | return 0; |
| 56 | } |
| 57 | |
| 58 | coff_magic = H_GET_16 (abfd, magicbuf); |
| 59 | if (coff_magic != COFF_MAGIC) |
| 60 | return 0; /* Not an encap coff file */ |
| 61 | |
| 62 | magic = H_GET_32 (abfd, magicbuf); |
| 63 | |
| 64 | if (N_BADMAG (*((struct internal_exec *) &magic))) |
| 65 | return 0; |
| 66 | |
| 67 | if (bfd_seek (abfd, (file_ptr) sizeof (struct coffheader), SEEK_SET) != 0) |
| 68 | return 0; |
| 69 | |
| 70 | amt = EXEC_BYTES_SIZE; |
| 71 | if (bfd_bread ((PTR) &exec_bytes, amt, abfd) != amt) |
| 72 | { |
| 73 | if (bfd_get_error () != bfd_error_system_call) |
| 74 | bfd_set_error (bfd_error_wrong_format); |
| 75 | return 0; |
| 76 | } |
| 77 | NAME(aout,swap_exec_header_in) (abfd, &exec_bytes, &exec); |
| 78 | |
| 79 | return aout_32_some_aout_object_p (abfd, &exec, encap_realcallback); |
| 80 | } |
| 81 | |
| 82 | /* Finish up the reading of an encapsulated-coff a.out file header. */ |
| 83 | const bfd_target * |
| 84 | encap_real_callback (abfd) |
| 85 | bfd *abfd; |
| 86 | { |
| 87 | struct internal_exec *execp = exec_hdr (abfd); |
| 88 | |
| 89 | MY(callback) (abfd, execp); |
| 90 | |
| 91 | /* If we have a coff header, it can give us better values for |
| 92 | text_start and exec_data_start. This is particularly useful |
| 93 | for remote debugging of embedded systems. */ |
| 94 | if (N_FLAGS(exec_aouthdr) & N_FLAGS_COFF_ENCAPSULATE) |
| 95 | { |
| 96 | struct coffheader ch; |
| 97 | int val; |
| 98 | val = lseek (execchan, -(sizeof (AOUTHDR) + sizeof (ch)), 1); |
| 99 | if (val == -1) |
| 100 | perror_with_name (filename); |
| 101 | val = myread (execchan, &ch, sizeof (ch)); |
| 102 | if (val < 0) |
| 103 | perror_with_name (filename); |
| 104 | text_start = ch.text_start; |
| 105 | exec_data_start = ch.data_start; |
| 106 | } |
| 107 | else |
| 108 | { |
| 109 | text_start = |
| 110 | IS_OBJECT_FILE (exec_aouthdr) ? 0 : N_TXTADDR (exec_aouthdr); |
| 111 | exec_data_start = (IS_OBJECT_FILE (exec_aouthdr) |
| 112 | ? exec_aouthdr.a_text |
| 113 | : N_DATADDR (exec_aouthdr)); |
| 114 | } |
| 115 | |
| 116 | /* Determine the architecture and machine type of the object file. */ |
| 117 | bfd_default_set_arch_mach(abfd, bfd_arch_m68k, 0); /* FIXME */ |
| 118 | |
| 119 | return abfd->xvec; |
| 120 | } |
| 121 | |
| 122 | /* Write an object file in Encapsulated COFF format. |
| 123 | Section contents have already been written. We write the |
| 124 | file header, symbols, and relocation. */ |
| 125 | |
| 126 | boolean |
| 127 | encap_write_object_contents (abfd) |
| 128 | bfd *abfd; |
| 129 | { |
| 130 | bfd_size_type data_pad = 0; |
| 131 | struct external_exec exec_bytes; |
| 132 | struct internal_exec *execp = exec_hdr (abfd); |
| 133 | |
| 134 | /* FIXME: Fragments from the old GNU LD program for dealing with |
| 135 | encap coff. */ |
| 136 | struct coffheader coffheader; |
| 137 | int need_coff_header; |
| 138 | |
| 139 | /* Determine whether to count the header as part of |
| 140 | the text size, and initialize the text size accordingly. |
| 141 | This depends on the kind of system and on the output format selected. */ |
| 142 | |
| 143 | N_SET_MAGIC (outheader, magic); |
| 144 | #ifdef INITIALIZE_HEADER |
| 145 | INITIALIZE_HEADER; |
| 146 | #endif |
| 147 | |
| 148 | text_size = sizeof (struct exec); |
| 149 | #ifdef COFF_ENCAPSULATE |
| 150 | if (relocatable_output == 0 && file_table[0].just_syms_flag == 0) |
| 151 | { |
| 152 | need_coff_header = 1; |
| 153 | /* set this flag now, since it will change the values of N_TXTOFF, etc */ |
| 154 | N_SET_FLAGS (outheader, aout_backend_info (abfd)->exec_hdr_flags); |
| 155 | text_size += sizeof (struct coffheader); |
| 156 | } |
| 157 | #endif |
| 158 | |
| 159 | #ifdef COFF_ENCAPSULATE |
| 160 | if (need_coff_header) |
| 161 | { |
| 162 | /* We are encapsulating BSD format within COFF format. */ |
| 163 | struct coffscn *tp, *dp, *bp; |
| 164 | |
| 165 | tp = &coffheader.scns[0]; |
| 166 | dp = &coffheader.scns[1]; |
| 167 | bp = &coffheader.scns[2]; |
| 168 | |
| 169 | strcpy (tp->s_name, ".text"); |
| 170 | tp->s_paddr = text_start; |
| 171 | tp->s_vaddr = text_start; |
| 172 | tp->s_size = text_size; |
| 173 | tp->s_scnptr = sizeof (struct coffheader) + sizeof (struct exec); |
| 174 | tp->s_relptr = 0; |
| 175 | tp->s_lnnoptr = 0; |
| 176 | tp->s_nreloc = 0; |
| 177 | tp->s_nlnno = 0; |
| 178 | tp->s_flags = 0x20; |
| 179 | strcpy (dp->s_name, ".data"); |
| 180 | dp->s_paddr = data_start; |
| 181 | dp->s_vaddr = data_start; |
| 182 | dp->s_size = data_size; |
| 183 | dp->s_scnptr = tp->s_scnptr + tp->s_size; |
| 184 | dp->s_relptr = 0; |
| 185 | dp->s_lnnoptr = 0; |
| 186 | dp->s_nreloc = 0; |
| 187 | dp->s_nlnno = 0; |
| 188 | dp->s_flags = 0x40; |
| 189 | strcpy (bp->s_name, ".bss"); |
| 190 | bp->s_paddr = dp->s_vaddr + dp->s_size; |
| 191 | bp->s_vaddr = bp->s_paddr; |
| 192 | bp->s_size = bss_size; |
| 193 | bp->s_scnptr = 0; |
| 194 | bp->s_relptr = 0; |
| 195 | bp->s_lnnoptr = 0; |
| 196 | bp->s_nreloc = 0; |
| 197 | bp->s_nlnno = 0; |
| 198 | bp->s_flags = 0x80; |
| 199 | |
| 200 | coffheader.f_magic = COFF_MAGIC; |
| 201 | coffheader.f_nscns = 3; |
| 202 | /* store an unlikely time so programs can |
| 203 | * tell that there is a bsd header |
| 204 | */ |
| 205 | coffheader.f_timdat = 1; |
| 206 | coffheader.f_symptr = 0; |
| 207 | coffheader.f_nsyms = 0; |
| 208 | coffheader.f_opthdr = 28; |
| 209 | coffheader.f_flags = 0x103; |
| 210 | /* aouthdr */ |
| 211 | coffheader.magic = ZMAGIC; |
| 212 | coffheader.vstamp = 0; |
| 213 | coffheader.tsize = tp->s_size; |
| 214 | coffheader.dsize = dp->s_size; |
| 215 | coffheader.bsize = bp->s_size; |
| 216 | coffheader.entry = outheader.a_entry; |
| 217 | coffheader.text_start = tp->s_vaddr; |
| 218 | coffheader.data_start = dp->s_vaddr; |
| 219 | } |
| 220 | #endif |
| 221 | |
| 222 | #ifdef COFF_ENCAPSULATE |
| 223 | if (need_coff_header) |
| 224 | mywrite (&coffheader, sizeof coffheader, 1, outdesc); |
| 225 | #endif |
| 226 | |
| 227 | #ifndef COFF_ENCAPSULATE |
| 228 | padfile (N_TXTOFF (outheader) - sizeof outheader, outdesc); |
| 229 | #endif |
| 230 | |
| 231 | text_size -= N_TXTOFF (outheader); |
| 232 | WRITE_HEADERS(abfd, execp); |
| 233 | return true; |
| 234 | } |
| 235 | |
| 236 | #define MY_write_object_content encap_write_object_contents |
| 237 | #define MY_object_p encap_object_p |
| 238 | #define MY_exec_hdr_flags N_FLAGS_COFF_ENCAPSULATE |
| 239 | |
| 240 | #include "aout-target.h" |