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annotate lwlink/objdump.c @ 407:b2e007c28b8f
Changed ENDS to be ENDSTRUCT instead of ENDSECTION since ENDSTRUCT is required but ENDSECTION is not; updated docs to reflect change
| author | lost@l-w.ca |
|---|---|
| date | Fri, 23 Jul 2010 19:53:43 -0600 |
| parents | a741d2e4869f |
| children |
| rev | line source |
|---|---|
| 339 | 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 */ | |
| 24 #include <config.h> | |
| 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); | |
| 35 char *program_name; | |
| 36 | |
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37 char *string_cleanup(char *sym) |
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38 { |
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39 static char symbuf[4096]; |
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40 int optr = 0; |
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41 while (*sym) |
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42 { |
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43 if (*sym < 33 || *sym > 126) |
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44 { |
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45 int c; |
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46 symbuf[optr++] = '\\'; |
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47 c = *sym >> 4; |
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48 c+= 48; |
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49 if (c > 57) |
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50 c += 7; |
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51 symbuf[optr++] = c; |
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52 c = *sym & 15; |
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53 c += 48; |
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54 if (c > 57) |
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55 c += 7; |
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56 symbuf[optr++] = c; |
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57 } |
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58 else if (*sym == '\\') |
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59 { |
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60 symbuf[optr++] = '\\'; |
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61 symbuf[optr++] = '\\'; |
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62 } |
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63 else |
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64 { |
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65 symbuf[optr++] = *sym; |
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66 } |
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67 sym++; |
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68 } |
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69 symbuf[optr] = '\0'; |
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70 return symbuf; |
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71 } |
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72 |
| 339 | 73 /* |
| 74 The logic of reading the entire file into memory is simple. All the symbol | |
| 75 names in the file are NUL terminated strings and can be used directly without | |
| 76 making additional copies. | |
| 77 */ | |
| 78 int main(int argc, char **argv) | |
| 79 { | |
| 80 int i; | |
| 81 long size; | |
| 82 FILE *f; | |
| 83 long bread; | |
| 84 unsigned char *filedata; | |
| 85 | |
| 86 program_name = argv[0]; | |
| 87 if (argc != 2) | |
| 88 { | |
| 89 fprintf(stderr, "Must specify exactly one input file.\n"); | |
| 90 exit(1); | |
| 91 } | |
| 92 | |
| 93 f = fopen(argv[1], "rb"); | |
| 94 if (!f) | |
| 95 { | |
| 96 fprintf(stderr, "Can't open file %s:", argv[1]); | |
| 97 perror(""); | |
| 98 exit(1); | |
| 99 } | |
| 100 fseek(f, 0, SEEK_END); | |
| 101 size = ftell(f); | |
| 102 rewind(f); | |
| 103 | |
| 104 filedata = lw_malloc(size); | |
| 105 | |
| 106 bread = fread(filedata, 1, size, f); | |
| 107 if (bread < size) | |
| 108 { | |
| 109 fprintf(stderr, "Short read on file %s (%ld/%ld):", argv[1], bread, size); | |
| 110 perror(""); | |
| 111 exit(1); | |
| 112 } | |
| 113 | |
| 114 fclose(f); | |
| 115 | |
| 116 if (!memcmp(filedata, "LWOBJ16", 8)) | |
| 117 { | |
| 118 // read v0 LWOBJ16 file | |
| 119 read_lwobj16v0(filedata, size); | |
| 120 } | |
| 121 else | |
| 122 { | |
| 123 fprintf(stderr, "%s: unknown file format\n", argv[1]); | |
| 124 exit(1); | |
| 125 } | |
| 126 exit(0); | |
| 127 } | |
| 128 | |
| 129 // this macro is used to bail out if we run off the end of the file data | |
| 130 // while parsing - it keeps the code below cleaner | |
| 131 #define NEXTBYTE() do { cc++; if (cc > filesize) { fprintf(stderr, "***invalid file format\n"); exit(1); } } while (0) | |
| 132 // this macro is used to refer to the current byte in the stream | |
| 133 #define CURBYTE() (filedata[cc < filesize ? cc : filesize - 1]) | |
| 134 // this one will leave the input pointer past the trailing NUL | |
| 135 #define CURSTR() read_lwobj16v0_str(&cc, &filedata, filesize) | |
| 136 unsigned char *read_lwobj16v0_str(long *cc1, unsigned char **filedata1, long filesize) | |
| 137 { | |
| 138 int cc = *cc1; | |
| 139 unsigned char *filedata = *filedata1; | |
| 140 unsigned char *fp; | |
| 141 fp = &CURBYTE(); | |
| 142 while (CURBYTE()) | |
| 143 NEXTBYTE(); | |
| 144 NEXTBYTE(); | |
| 145 *cc1 = cc; | |
| 146 *filedata1 = filedata; | |
| 147 return fp; | |
| 148 } | |
| 149 // the function below can be switched to dealing with data coming from a | |
| 150 // source other than an in-memory byte pool by adjusting the input data | |
| 151 // in "fn" and the above two macros | |
| 152 void read_lwobj16v0(unsigned char *filedata, long filesize) | |
| 153 { | |
| 154 unsigned char *fp; | |
| 155 long cc; | |
| 156 int val; | |
| 157 int bss; | |
| 158 | |
| 159 static char *opernames[] = { | |
| 160 "?", | |
| 161 "PLUS", | |
| 162 "MINUS", | |
| 163 "TIMES", | |
| 164 "DIVIDE", | |
| 165 "MOD", | |
| 166 "INTDIV", | |
| 167 "BWAND", | |
| 168 "BWOR", | |
| 169 "BWXOR", | |
| 170 "AND", | |
| 171 "OR", | |
| 172 "NEG", | |
| 173 "COM" | |
| 174 }; | |
| 175 static const int numopers = 13; | |
| 176 | |
| 177 // start reading *after* the magic number | |
| 178 cc = 8; | |
| 179 | |
| 180 while (1) | |
| 181 { | |
| 182 bss = 0; | |
| 183 | |
| 184 // bail out if no more sections | |
| 185 if (!(CURBYTE())) | |
| 186 break; | |
| 187 | |
| 188 fp = CURSTR(); | |
| 189 | |
| 190 printf("SECTION %s\n", fp); | |
| 191 | |
| 192 // read flags | |
| 193 while (CURBYTE()) | |
| 194 { | |
| 195 switch (CURBYTE()) | |
| 196 { | |
| 197 case 0x01: | |
| 198 printf(" FLAG: BSS\n"); | |
| 199 bss = 1; | |
| 200 break; | |
| 201 | |
| 202 default: | |
| 203 printf(" FLAG: %02X (unknown)\n", CURBYTE()); | |
| 204 break; | |
| 205 } | |
| 206 NEXTBYTE(); | |
| 207 } | |
| 208 // skip NUL terminating flags | |
| 209 NEXTBYTE(); | |
| 210 | |
| 211 printf(" Local symbols:\n"); | |
| 212 // now parse the local symbol table | |
| 213 while (CURBYTE()) | |
| 214 { | |
| 215 fp = CURSTR(); | |
| 216 | |
| 217 // fp is the symbol name | |
| 218 val = (CURBYTE()) << 8; | |
| 219 NEXTBYTE(); | |
| 220 val |= (CURBYTE()); | |
| 221 NEXTBYTE(); | |
| 222 // val is now the symbol value | |
| 223 | |
|
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224 printf(" %s=%04X\n", string_cleanup(fp), val); |
| 339 | 225 |
| 226 } | |
| 227 // skip terminating NUL | |
| 228 NEXTBYTE(); | |
| 229 | |
| 230 printf(" Exported symbols\n"); | |
| 231 | |
| 232 // now parse the exported symbol table | |
| 233 while (CURBYTE()) | |
| 234 { | |
| 235 fp = CURSTR(); | |
| 236 | |
| 237 // fp is the symbol name | |
| 238 val = (CURBYTE()) << 8; | |
| 239 NEXTBYTE(); | |
| 240 val |= (CURBYTE()); | |
| 241 NEXTBYTE(); | |
| 242 // val is now the symbol value | |
| 243 | |
|
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244 printf(" %s=%04X\n", string_cleanup(fp), val); |
| 339 | 245 } |
| 246 // skip terminating NUL | |
| 247 NEXTBYTE(); | |
| 248 | |
| 249 // now parse the incomplete references and make a list of | |
| 250 // external references that need resolution | |
| 251 printf(" Incomplete references\n"); | |
| 252 while (CURBYTE()) | |
| 253 { | |
| 254 printf(" ("); | |
| 255 // parse the expression | |
| 256 while (CURBYTE()) | |
| 257 { | |
| 258 int tt = CURBYTE(); | |
| 259 NEXTBYTE(); | |
| 260 switch (tt) | |
| 261 { | |
| 262 case 0x01: | |
| 263 // 16 bit integer | |
| 264 tt = CURBYTE() << 8; | |
| 265 NEXTBYTE(); | |
| 266 tt |= CURBYTE(); | |
| 267 NEXTBYTE(); | |
| 268 // normalize for negatives... | |
| 269 if (tt > 0x7fff) | |
| 270 tt -= 0x10000; | |
| 271 printf(" I16=%d", tt); | |
| 272 break; | |
| 273 | |
| 274 case 0x02: | |
| 275 // external symbol reference | |
|
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276 printf(" ES=%s", string_cleanup(CURSTR())); |
| 339 | 277 break; |
| 278 | |
| 279 case 0x03: | |
| 280 // internal symbol reference | |
|
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281 printf(" IS=%s", string_cleanup(CURSTR())); |
| 339 | 282 break; |
| 283 | |
| 284 case 0x04: | |
| 285 // operator | |
| 286 if (CURBYTE() > 0 && CURBYTE() <= numopers) | |
| 287 printf(" OP=%s", opernames[CURBYTE()]); | |
| 288 else | |
| 289 printf(" OP=?"); | |
| 290 NEXTBYTE(); | |
| 291 break; | |
| 292 | |
| 293 case 0x05: | |
| 294 // section base reference (NULL internal reference is | |
| 295 // the section base address | |
| 296 printf(" SB"); | |
| 297 break; | |
| 298 | |
| 299 case 0xFF: | |
| 300 // section flags | |
| 301 printf(" FLAGS=%02X", CURBYTE()); | |
| 302 NEXTBYTE(); | |
| 303 break; | |
| 304 | |
| 305 default: | |
| 306 printf(" ERR"); | |
| 307 } | |
| 308 } | |
| 309 // skip the NUL | |
| 310 NEXTBYTE(); | |
| 311 | |
| 312 // fetch the offset | |
| 313 val = CURBYTE() << 8; | |
| 314 NEXTBYTE(); | |
| 315 val |= CURBYTE() & 0xff; | |
| 316 NEXTBYTE(); | |
| 317 printf(" ) @ %04X\n", val); | |
| 318 } | |
| 319 // skip the NUL terminating the relocations | |
| 320 NEXTBYTE(); | |
| 321 | |
| 322 // now set code location and size and verify that the file | |
| 323 // contains data going to the end of the code (if !SECTION_BSS) | |
| 324 val = CURBYTE() << 8; | |
| 325 NEXTBYTE(); | |
| 326 val |= CURBYTE(); | |
| 327 NEXTBYTE(); | |
| 328 | |
| 329 printf(" CODE %04X bytes", val); | |
| 330 | |
| 331 // skip the code if we're not in a BSS section | |
| 332 if (!bss) | |
| 333 { | |
| 334 int i; | |
| 335 for (i = 0; i < val; i++) | |
| 336 { | |
| 337 if (! (i % 16)) | |
| 338 { | |
| 339 printf("\n %04X ", i); | |
| 340 } | |
| 341 printf("%02X", CURBYTE()); | |
| 342 NEXTBYTE(); | |
| 343 } | |
| 344 } | |
| 345 printf("\n"); | |
| 346 } | |
| 347 } |