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annotate lwlink/objdump.c @ 233:efda73d44e1b
Updated discussion of assembly dialects
| author | lost |
|---|---|
| date | Fri, 12 Jun 2009 04:54:12 +0000 |
| parents | bae1e3ecdce1 |
| children | f9f01a499525 |
| rev | line source |
|---|---|
| 129 | 1 /* |
| 2 objdump.c | |
| 3 Copyright © 2009 William Astle | |
| 4 | |
| 5 This file is part of LWLINK | |
| 6 | |
| 7 LWLINK is free software: you can redistribute it and/or modify it under the | |
| 8 terms of the GNU General Public License as published by the Free Software | |
| 9 Foundation, either version 3 of the License, or (at your option) any later | |
| 10 version. | |
| 11 | |
| 12 This program is distributed in the hope that it will be useful, but WITHOUT | |
| 13 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
| 15 more details. | |
| 16 | |
| 17 You should have received a copy of the GNU General Public License along with | |
| 18 this program. If not, see <http://www.gnu.org/licenses/>. | |
| 19 | |
| 20 | |
| 21 A standalone program to dump an object file in a text form to stdout | |
| 22 | |
| 23 */ | |
| 212 | 24 #include <config.h> |
| 129 | 25 #include <stdio.h> |
| 26 #include <stdlib.h> | |
| 27 | |
| 28 #include "util.h" | |
| 29 | |
| 30 #ifdef HAVE_CONFIG_H | |
| 31 #include "config.h" | |
| 32 #endif | |
| 33 | |
| 34 void read_lwobj16v0(unsigned char *filedata, long filesize); | |
| 212 | 35 char *program_name; |
| 129 | 36 |
| 37 /* | |
| 38 The logic of reading the entire file into memory is simple. All the symbol | |
| 39 names in the file are NUL terminated strings and can be used directly without | |
| 40 making additional copies. | |
| 41 */ | |
| 42 int main(int argc, char **argv) | |
| 43 { | |
| 44 int i; | |
| 45 long size; | |
| 46 FILE *f; | |
| 47 long bread; | |
| 48 unsigned char *filedata; | |
| 212 | 49 |
| 50 program_name = argv[0]; | |
| 129 | 51 if (argc != 2) |
| 52 { | |
| 53 fprintf(stderr, "Must specify exactly one input file.\n"); | |
| 54 exit(1); | |
| 55 } | |
| 56 | |
| 57 f = fopen(argv[1], "rb"); | |
| 58 if (!f) | |
| 59 { | |
| 60 fprintf(stderr, "Can't open file %s:", argv[1]); | |
| 61 perror(""); | |
| 62 exit(1); | |
| 63 } | |
| 64 fseek(f, 0, SEEK_END); | |
| 65 size = ftell(f); | |
| 66 rewind(f); | |
| 67 | |
| 68 filedata = lw_malloc(size); | |
| 69 | |
| 70 bread = fread(filedata, 1, size, f); | |
| 71 if (bread < size) | |
| 72 { | |
| 73 fprintf(stderr, "Short read on file %s (%ld/%ld):", argv[1], bread, size); | |
| 74 perror(""); | |
| 75 exit(1); | |
| 76 } | |
| 77 | |
| 78 fclose(f); | |
| 79 | |
| 80 if (!memcmp(filedata, "LWOBJ16", 8)) | |
| 81 { | |
| 82 // read v0 LWOBJ16 file | |
| 83 read_lwobj16v0(filedata, size); | |
| 84 } | |
| 85 else | |
| 86 { | |
| 87 fprintf(stderr, "%s: unknown file format\n", argv[1]); | |
| 88 exit(1); | |
| 89 } | |
| 90 exit(0); | |
| 91 } | |
| 92 | |
| 93 // this macro is used to bail out if we run off the end of the file data | |
| 94 // while parsing - it keeps the code below cleaner | |
| 95 #define NEXTBYTE() do { cc++; if (cc > filesize) { fprintf(stderr, "***invalid file format\n"); exit(1); } } while (0) | |
| 96 // this macro is used to refer to the current byte in the stream | |
| 97 #define CURBYTE() (filedata[cc < filesize ? cc : filesize - 1]) | |
| 98 // this one will leave the input pointer past the trailing NUL | |
| 99 #define CURSTR() read_lwobj16v0_str(&cc, &filedata, filesize) | |
| 100 unsigned char *read_lwobj16v0_str(long *cc1, unsigned char **filedata1, long filesize) | |
| 101 { | |
| 102 int cc = *cc1; | |
| 103 unsigned char *filedata = *filedata1; | |
| 104 unsigned char *fp; | |
| 105 fp = &CURBYTE(); | |
| 106 while (CURBYTE()) | |
| 107 NEXTBYTE(); | |
| 108 NEXTBYTE(); | |
| 109 *cc1 = cc; | |
| 110 *filedata1 = filedata; | |
| 111 return fp; | |
| 112 } | |
| 113 // the function below can be switched to dealing with data coming from a | |
| 114 // source other than an in-memory byte pool by adjusting the input data | |
| 115 // in "fn" and the above two macros | |
| 116 void read_lwobj16v0(unsigned char *filedata, long filesize) | |
| 117 { | |
| 118 unsigned char *fp; | |
| 119 long cc; | |
| 120 int val; | |
| 121 int bss; | |
| 122 | |
| 123 static char *opernames[] = { | |
| 124 "?", | |
| 125 "PLUS", | |
| 126 "MINUS", | |
| 127 "TIMES", | |
| 128 "DIVIDE", | |
| 129 "MOD", | |
| 130 "INTDIV", | |
| 131 "BWAND", | |
| 132 "BWOR", | |
| 133 "BWXOR", | |
| 134 "AND", | |
| 135 "OR", | |
| 136 "NEG", | |
| 137 "COM" | |
| 138 }; | |
| 139 static const int numopers = 13; | |
| 140 | |
| 141 // start reading *after* the magic number | |
| 142 cc = 8; | |
| 143 | |
| 144 while (1) | |
| 145 { | |
| 146 bss = 0; | |
| 147 | |
| 148 // bail out if no more sections | |
| 149 if (!(CURBYTE())) | |
| 150 break; | |
| 151 | |
| 152 fp = CURSTR(); | |
| 153 | |
| 154 printf("SECTION %s\n", fp); | |
| 155 | |
| 156 // read flags | |
| 157 while (CURBYTE()) | |
| 158 { | |
| 159 switch (CURBYTE()) | |
| 160 { | |
| 161 case 0x01: | |
| 162 printf(" FLAG: BSS\n"); | |
| 163 bss = 1; | |
| 164 break; | |
| 165 | |
| 166 default: | |
| 167 printf(" FLAG: %02X (unknown)\n", CURBYTE()); | |
| 168 break; | |
| 169 } | |
| 170 NEXTBYTE(); | |
| 171 } | |
| 172 // skip NUL terminating flags | |
| 173 NEXTBYTE(); | |
| 174 | |
| 175 printf(" Local symbols:\n"); | |
| 176 // now parse the local symbol table | |
| 177 while (CURBYTE()) | |
| 178 { | |
| 179 fp = CURSTR(); | |
| 180 | |
| 181 // fp is the symbol name | |
| 182 val = (CURBYTE()) << 8; | |
| 183 NEXTBYTE(); | |
| 184 val |= (CURBYTE()); | |
| 185 NEXTBYTE(); | |
| 186 // val is now the symbol value | |
| 187 | |
| 188 printf(" %s=%04X\n", fp, val); | |
| 189 | |
| 190 } | |
| 191 // skip terminating NUL | |
| 192 NEXTBYTE(); | |
| 193 | |
| 194 printf(" Exported symbols\n"); | |
| 195 | |
| 196 // now parse the exported symbol table | |
| 197 while (CURBYTE()) | |
| 198 { | |
| 199 fp = CURSTR(); | |
| 200 | |
| 201 // fp is the symbol name | |
| 202 val = (CURBYTE()) << 8; | |
| 203 NEXTBYTE(); | |
| 204 val |= (CURBYTE()); | |
| 205 NEXTBYTE(); | |
| 206 // val is now the symbol value | |
| 207 | |
| 208 printf(" %s=%04X\n", fp, val); | |
| 209 } | |
| 210 // skip terminating NUL | |
| 211 NEXTBYTE(); | |
| 212 | |
| 213 // now parse the incomplete references and make a list of | |
| 214 // external references that need resolution | |
| 215 printf(" Incomplete references\n"); | |
| 216 while (CURBYTE()) | |
| 217 { | |
| 218 printf(" ("); | |
| 219 // parse the expression | |
| 220 while (CURBYTE()) | |
| 221 { | |
| 222 int tt = CURBYTE(); | |
| 223 NEXTBYTE(); | |
| 224 switch (tt) | |
| 225 { | |
| 226 case 0x01: | |
| 227 // 16 bit integer | |
| 228 tt = CURBYTE() << 8; | |
| 229 NEXTBYTE(); | |
| 230 tt |= CURBYTE(); | |
| 231 NEXTBYTE(); | |
| 232 // normalize for negatives... | |
| 233 if (tt > 0x7fff) | |
| 234 tt -= 0x10000; | |
| 235 printf(" I16=%d", tt); | |
| 236 break; | |
| 237 | |
| 238 case 0x02: | |
| 239 // external symbol reference | |
| 240 printf(" ES=%s", CURSTR()); | |
| 241 break; | |
| 242 | |
| 243 case 0x03: | |
| 244 // internal symbol reference | |
| 245 printf(" IS=%s", CURSTR()); | |
| 246 break; | |
| 247 | |
| 248 case 0x04: | |
| 249 // operator | |
| 250 if (CURBYTE() > 0 && CURBYTE() <= numopers) | |
| 251 printf(" OP=%s", opernames[CURBYTE()]); | |
| 252 else | |
| 253 printf(" OP=?"); | |
| 254 NEXTBYTE(); | |
| 255 break; | |
| 256 | |
| 257 case 0x05: | |
| 258 // section base reference (NULL internal reference is | |
| 259 // the section base address | |
| 260 printf(" SB"); | |
| 261 break; | |
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262 |
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263 case 0xFF: |
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264 // section flags |
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265 printf(" FLAGS=%02X", CURBYTE()); |
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266 NEXTBYTE(); |
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267 break; |
| 129 | 268 |
| 269 default: | |
| 270 printf(" ERR"); | |
| 271 } | |
| 272 } | |
| 273 // skip the NUL | |
| 274 NEXTBYTE(); | |
| 275 | |
| 276 // fetch the offset | |
| 277 val = CURBYTE() << 8; | |
| 278 NEXTBYTE(); | |
| 279 val |= CURBYTE() & 0xff; | |
| 280 NEXTBYTE(); | |
| 281 printf(" ) @ %04X\n", val); | |
| 282 } | |
| 283 // skip the NUL terminating the relocations | |
| 284 NEXTBYTE(); | |
| 285 | |
| 286 // now set code location and size and verify that the file | |
| 287 // contains data going to the end of the code (if !SECTION_BSS) | |
| 288 val = CURBYTE() << 8; | |
| 289 NEXTBYTE(); | |
| 290 val |= CURBYTE(); | |
| 291 NEXTBYTE(); | |
| 292 | |
| 293 printf(" CODE %04X bytes", val); | |
| 294 | |
| 295 // skip the code if we're not in a BSS section | |
| 296 if (!bss) | |
| 297 { | |
| 298 int i; | |
| 299 for (i = 0; i < val; i++) | |
| 300 { | |
| 301 if (! (i % 16)) | |
| 302 { | |
| 303 printf("\n %04X ", i); | |
| 304 } | |
| 305 printf("%02X", CURBYTE()); | |
| 306 NEXTBYTE(); | |
| 307 } | |
| 308 } | |
| 309 printf("\n"); | |
| 310 } | |
| 311 } |