| 1 | /* unexapollo.c -- COFF File UNEXEC for GNU Emacs on Apollo SR10.x |
| 2 | Copyright (C) 1988, 1994, 2001, 2002, 2003, 2004, |
| 3 | 2005, 2006, 2007 Free Software Foundation, Inc. |
| 4 | |
| 5 | This file is part of GNU Emacs. |
| 6 | |
| 7 | GNU Emacs 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 3, or (at your option) |
| 10 | any later version. |
| 11 | |
| 12 | GNU Emacs 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 GNU Emacs; see the file COPYING. If not, write to |
| 19 | the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, |
| 20 | Boston, MA 02110-1301, USA. */ |
| 21 | |
| 22 | /* Written by Leonard N. Zubkoff. */ |
| 23 | |
| 24 | #ifdef HAVE_CONFIG_H |
| 25 | #include <config.h> |
| 26 | #endif |
| 27 | |
| 28 | #include <fcntl.h> |
| 29 | |
| 30 | |
| 31 | #include <a.out.h> |
| 32 | #include <sys/file.h> |
| 33 | #include <apollo/base.h> |
| 34 | #include <apollo/ios.h> |
| 35 | #include <apollo/type_uids.h> |
| 36 | #include <apollo/dst.h> |
| 37 | |
| 38 | |
| 39 | #define DST_RECORD_HDR_SIZE 2 |
| 40 | #define LONG_ALIGN(X) (((X)+3)&(~3)) |
| 41 | |
| 42 | |
| 43 | void |
| 44 | unexec (target_file_name, source_file_name) |
| 45 | char *target_file_name, *source_file_name; |
| 46 | { |
| 47 | struct filehdr file_header; |
| 48 | struct aouthdr domain_header; |
| 49 | struct scnhdr *section, *sections, *sections_limit; |
| 50 | struct scnhdr *first_data_section, *last_data_section; |
| 51 | struct scnhdr *rwdi_section, *blocks_section; |
| 52 | struct reloc reloc_entry; |
| 53 | unsigned long data_size, old_data_section_size, source_file_offset_past_rwdi; |
| 54 | unsigned char buffer[4096]; |
| 55 | long delta_before_rwdi, delta_after_rwdi, byte_count; |
| 56 | long first_changed_vaddr, old_rwdi_vaddr, i; |
| 57 | ios_$id_t target_file, source_file; |
| 58 | status_$t status; |
| 59 | /* Open the Source File. */ |
| 60 | if ((source_file = open (source_file_name, O_RDONLY)) < 0) |
| 61 | error ("cannot open source file for input"); |
| 62 | /* Read the File Header. */ |
| 63 | if (read (source_file, &file_header, sizeof (file_header)) != sizeof (file_header)) |
| 64 | error ("cannot read file header"); |
| 65 | \f |
| 66 | /* Read the Domain Header. */ |
| 67 | if (read (source_file, &domain_header, sizeof (domain_header)) |
| 68 | != sizeof (domain_header)) |
| 69 | error ("cannot read domain header"); |
| 70 | /* Read the Section Headers. */ |
| 71 | sections = |
| 72 | (struct scnhdr *) malloc (file_header.f_nscns*sizeof (struct scnhdr)); |
| 73 | if (sections == (struct scnhdr *) 0) |
| 74 | error ("cannot allocate section header storage"); |
| 75 | sections_limit = sections + file_header.f_nscns; |
| 76 | if (read (source_file, sections, file_header.f_nscns*sizeof (struct scnhdr)) |
| 77 | != file_header.f_nscns*sizeof (struct scnhdr)) |
| 78 | error ("cannot read section headers"); |
| 79 | /* Compute the new Size of the Data Section. */ |
| 80 | data_size = sbrk (0) - domain_header.data_start; |
| 81 | delta_before_rwdi = delta_after_rwdi = data_size - domain_header.dsize; |
| 82 | old_rwdi_vaddr = 0; |
| 83 | /* Find and Deallocate the .rwdi Section Information. */ |
| 84 | for (rwdi_section = sections; rwdi_section != sections_limit; rwdi_section++) |
| 85 | if (strcmp (rwdi_section->s_name, ".rwdi") == 0) |
| 86 | { |
| 87 | /* If there are relocation entries, we cannot "unrelocate" them. */ |
| 88 | if (rwdi_section->s_nreloc > 0) |
| 89 | error (".rwdi section needs relocation - cannot dump Emacs"); |
| 90 | delta_after_rwdi = delta_before_rwdi - rwdi_section->s_size; |
| 91 | old_rwdi_vaddr = rwdi_section->s_vaddr; |
| 92 | rwdi_section->s_paddr = 0; |
| 93 | rwdi_section->s_vaddr = 0; |
| 94 | rwdi_section->s_scnptr = 0; |
| 95 | rwdi_section->s_size = 0; |
| 96 | source_file_offset_past_rwdi = (rwdi_section+1)->s_scnptr; |
| 97 | break; |
| 98 | } |
| 99 | /* Skip over the Text Section Headers. */ |
| 100 | for (section = sections; (section->s_flags & STYP_TEXT) != 0; section++) ; |
| 101 | /* |
| 102 | Find the First and Last Data Sections and Fixup |
| 103 | Section Header Relocation Pointers. |
| 104 | */ |
| 105 | first_data_section = last_data_section = (struct scnhdr *) 0; |
| 106 | for (; section != sections_limit; section++) |
| 107 | { |
| 108 | if ((section->s_flags & STYP_DATA) != 0) |
| 109 | { |
| 110 | if (first_data_section == (struct scnhdr *) 0) |
| 111 | first_data_section = section; |
| 112 | last_data_section = section; |
| 113 | } |
| 114 | if (section->s_relptr != 0) |
| 115 | section->s_relptr += delta_after_rwdi; |
| 116 | } |
| 117 | /* Increment the Size of the Last Data Section. */ |
| 118 | old_data_section_size = last_data_section->s_size; |
| 119 | last_data_section->s_size += delta_before_rwdi; |
| 120 | \f |
| 121 | /* Update the File Header and Domain Header. */ |
| 122 | file_header.f_symptr += delta_after_rwdi; |
| 123 | domain_header.dsize = data_size; |
| 124 | domain_header.bsize = 0; |
| 125 | /* Skip over subsequent Bss Section Headers. */ |
| 126 | for (section = last_data_section+1; |
| 127 | (section->s_flags & STYP_BSS) != 0; section++) ; |
| 128 | /* Update the remaining Section Headers. */ |
| 129 | blocks_section = (struct scnhdr *) 0; |
| 130 | first_changed_vaddr = 0; |
| 131 | for (; section != sections_limit; section++) |
| 132 | { |
| 133 | long delta = (section < rwdi_section ? delta_before_rwdi : delta_after_rwdi); |
| 134 | if (section->s_paddr != 0) |
| 135 | section->s_paddr += delta; |
| 136 | if (section->s_vaddr != 0) |
| 137 | { |
| 138 | if (first_changed_vaddr == 0) |
| 139 | first_changed_vaddr = section->s_vaddr; |
| 140 | section->s_vaddr += delta; |
| 141 | } |
| 142 | if (section->s_scnptr != 0) |
| 143 | section->s_scnptr += delta; |
| 144 | if (strcmp (section->s_name, ".blocks") == 0) |
| 145 | blocks_section = section; |
| 146 | else if (strcmp (section->s_name, ".sri") == 0 && |
| 147 | domain_header.o_sri != 0) |
| 148 | domain_header.o_sri += delta; |
| 149 | else if (strcmp (section->s_name, ".inlib") == 0 && |
| 150 | domain_header.o_inlib != 0) |
| 151 | domain_header.o_inlib += delta; |
| 152 | } |
| 153 | /* Open the Target File. */ |
| 154 | ios_$create (target_file_name, strlen (target_file_name), coff_$uid, |
| 155 | ios_$recreate_mode, ios_$write_opt, &target_file, &status); |
| 156 | if (status.all != status_$ok) |
| 157 | error ("cannot open target file for output"); |
| 158 | /* Write the File Header. */ |
| 159 | if (write (target_file, &file_header, sizeof (file_header)) != sizeof (file_header)) |
| 160 | error ("cannot write file header"); |
| 161 | /* Write the Domain Header. */ |
| 162 | if (write (target_file, &domain_header, sizeof (domain_header)) |
| 163 | != sizeof (domain_header)) |
| 164 | error ("cannot write domain header"); |
| 165 | /* Write the Section Headers. */ |
| 166 | if (write (target_file, sections, file_header.f_nscns*sizeof (struct scnhdr)) |
| 167 | != file_header.f_nscns*sizeof (struct scnhdr)) |
| 168 | error ("cannot write section headers"); |
| 169 | /* Copy the Allocated Sections. */ |
| 170 | for (section = sections; section != first_data_section; section++) |
| 171 | if (section->s_scnptr != 0) |
| 172 | CopyData (target_file, source_file, LONG_ALIGN(section->s_size)); |
| 173 | /* Write the Expanded Data Segment. */ |
| 174 | if (write (target_file, first_data_section->s_vaddr, data_size) != data_size) |
| 175 | error ("cannot write new data section"); |
| 176 | \f |
| 177 | /* Skip over the Last Data Section and Copy until the .rwdi Section. */ |
| 178 | if (lseek (source_file, last_data_section->s_scnptr |
| 179 | +old_data_section_size, L_SET) == -1) |
| 180 | error ("cannot seek past data section"); |
| 181 | for (section = last_data_section+1; section != rwdi_section; section++) |
| 182 | if (section->s_scnptr != 0) |
| 183 | CopyData (target_file, source_file, LONG_ALIGN(section->s_size)); |
| 184 | /* Skip over the .rwdi Section and Copy Remainder of Source File. */ |
| 185 | if (lseek (source_file, source_file_offset_past_rwdi, L_SET) == -1) |
| 186 | error ("cannot seek past .rwdi section"); |
| 187 | while ((byte_count = read (source_file, buffer, sizeof (buffer))) > 0) |
| 188 | if (write (target_file, buffer, byte_count) != byte_count) |
| 189 | error ("cannot write data"); |
| 190 | /* Unrelocate .data references to Global Symbols. */ |
| 191 | for (section = first_data_section; section <= last_data_section; section++) |
| 192 | for (i = 0; i < section->s_nreloc; i++) |
| 193 | { |
| 194 | if (lseek (source_file, section->s_relptr |
| 195 | +i*sizeof (struct reloc)-delta_after_rwdi, L_SET) == -1) |
| 196 | error ("cannot seek to relocation info"); |
| 197 | if (read (source_file, &reloc_entry, sizeof (reloc_entry)) |
| 198 | != sizeof (reloc_entry)) |
| 199 | error ("cannot read reloc entry"); |
| 200 | if (lseek (source_file, reloc_entry.r_vaddr-section->s_vaddr |
| 201 | +section->s_scnptr, L_SET) == -1) |
| 202 | error ("cannot seek to data element"); |
| 203 | if (lseek (target_file, reloc_entry.r_vaddr-section->s_vaddr |
| 204 | +section->s_scnptr, L_SET) == -1) |
| 205 | error ("cannot seek to data element"); |
| 206 | if (read (source_file, buffer, 4) != 4) |
| 207 | error ("cannot read data element"); |
| 208 | if (write (target_file, buffer, 4) != 4) |
| 209 | error ("cannot write data element"); |
| 210 | } |
| 211 | \f |
| 212 | /* Correct virtual addresses in .blocks section. */ |
| 213 | if (blocks_section != (struct scnhdr *) 0) |
| 214 | { |
| 215 | dst_rec_t dst_record; |
| 216 | dst_rec_comp_unit_t *comp_unit; |
| 217 | unsigned short number_of_sections; |
| 218 | unsigned long section_base; |
| 219 | unsigned long section_offset = 0; |
| 220 | /* Find section tables and update section base addresses. */ |
| 221 | while (section_offset < blocks_section->s_size) |
| 222 | { |
| 223 | if (lseek (target_file, |
| 224 | blocks_section->s_scnptr+section_offset, L_SET) == -1) |
| 225 | error ("cannot seek to comp unit record"); |
| 226 | /* Handle pad records before the comp unit record. */ |
| 227 | if (read (target_file, &dst_record, DST_RECORD_HDR_SIZE) |
| 228 | != DST_RECORD_HDR_SIZE) |
| 229 | error ("cannot read dst record tag"); |
| 230 | if (dst_record.rec_type == dst_typ_pad) |
| 231 | section_offset += DST_RECORD_HDR_SIZE; |
| 232 | else if (dst_record.rec_type == dst_typ_comp_unit) |
| 233 | { |
| 234 | comp_unit = &dst_record.rec_data.comp_unit_; |
| 235 | if (read (target_file, comp_unit, sizeof (*comp_unit)) |
| 236 | != sizeof (*comp_unit)) |
| 237 | error ("cannot read comp unit record"); |
| 238 | if (lseek (target_file, blocks_section->s_scnptr |
| 239 | +section_offset |
| 240 | #if dst_version_major == 1 && dst_version_minor < 4 |
| 241 | +comp_unit->section_table |
| 242 | #else |
| 243 | +comp_unit->section_table.rel_offset |
| 244 | #endif |
| 245 | +DST_RECORD_HDR_SIZE, |
| 246 | L_SET) == -1) |
| 247 | error ("cannot seek to section table"); |
| 248 | if (read (target_file, &number_of_sections, sizeof (number_of_sections)) |
| 249 | != sizeof (number_of_sections)) |
| 250 | error ("cannot read section table size"); |
| 251 | for (i = 0; i < number_of_sections; i++) |
| 252 | { |
| 253 | if (read (target_file, §ion_base, sizeof (section_base)) |
| 254 | != sizeof (section_base)) |
| 255 | error ("cannot read section base value"); |
| 256 | if (section_base < first_changed_vaddr) |
| 257 | continue; |
| 258 | else if (section_base < old_rwdi_vaddr) |
| 259 | section_base += delta_before_rwdi; |
| 260 | else section_base += delta_after_rwdi; |
| 261 | if (lseek (target_file, -sizeof (section_base), L_INCR) == -1) |
| 262 | error ("cannot seek to section base value"); |
| 263 | if (write (target_file, §ion_base, sizeof (section_base)) |
| 264 | != sizeof (section_base)) |
| 265 | error ("cannot write section base"); |
| 266 | } |
| 267 | section_offset += comp_unit->data_size; |
| 268 | } |
| 269 | else error ("unexpected dst record type"); |
| 270 | } |
| 271 | } |
| 272 | \f |
| 273 | if (close (source_file) == -1) |
| 274 | error("cannot close source file"); |
| 275 | if (close (target_file) == -1) |
| 276 | error ("cannot close target file"); |
| 277 | } |
| 278 | |
| 279 | |
| 280 | static |
| 281 | CopyData (target_file, source_file, total_byte_count) |
| 282 | int target_file, source_file; |
| 283 | long total_byte_count; |
| 284 | { |
| 285 | unsigned char buffer[4096]; |
| 286 | long byte_count; |
| 287 | while (total_byte_count > 0) |
| 288 | { |
| 289 | if (total_byte_count > sizeof (buffer)) |
| 290 | byte_count = sizeof (buffer); |
| 291 | else byte_count = total_byte_count; |
| 292 | if (read (source_file, buffer, byte_count) != byte_count) |
| 293 | error ("cannot read data"); |
| 294 | if (write (target_file, buffer, byte_count) != byte_count) |
| 295 | error ("cannot write data"); |
| 296 | total_byte_count -= byte_count; |
| 297 | } |
| 298 | } |
| 299 | |
| 300 | /* arch-tag: 783ebbdf-7d26-4df8-9469-17a1747dce96 |
| 301 | (do not change this comment) */ |