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annotate lwlink/script.c @ 196:e7309c716059
Allow relative addressing to ignore a # before the operand (16 bit too!)
| author | lost |
|---|---|
| date | Sun, 22 Mar 2009 17:58:43 +0000 |
| parents | 857cb407229e |
| children | bae1e3ecdce1 |
| rev | line source |
|---|---|
| 117 | 1 /* |
| 2 script.c | |
| 118 | 3 Copyright © 2009 William Astle |
| 117 | 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 Read and parse linker scripts | |
| 22 */ | |
| 23 | |
| 24 #ifdef HAVE_CONFIG_H | |
| 25 #include "config.h" | |
| 26 #endif | |
| 27 | |
| 28 #include <errno.h> | |
| 29 #include <stdio.h> | |
| 30 #include <stdlib.h> | |
| 31 #include <string.h> | |
| 32 | |
| 33 #include "lwlink.h" | |
| 34 #include "util.h" | |
| 35 | |
| 36 // the built-in DECB target linker script | |
| 37 static char *decb_script = | |
| 124 | 38 "section init load 2000\n" |
| 117 | 39 "section code\n" |
| 40 "section *,!bss\n" | |
| 41 "section *,bss\n" | |
| 121 | 42 "entry 2000\n" |
| 117 | 43 ; |
| 44 | |
| 45 // the built-in RAW target linker script | |
| 46 static char *raw_script = | |
| 124 | 47 "section init load 0000\n" |
| 117 | 48 "section code\n" |
| 49 "section *,!bss\n" | |
| 50 "section *,bss\n" | |
| 51 ; | |
| 52 | |
| 187 | 53 static char *lwex0_script = |
| 54 "section init load 0100\n" | |
| 55 "section .text\n" | |
| 56 "section .data\n" | |
| 57 "section *,!bss\n" | |
| 58 "section *,bss\n" | |
| 59 "entry _start\n" | |
| 60 "stacksize 0100\n" // default 256 byte stack | |
| 61 ; | |
| 62 | |
| 117 | 63 // the "simple" script |
| 64 static char *simple_script = | |
| 65 "section *,!bss\n" | |
| 66 "section *,bss\n" | |
| 67 ; | |
| 68 | |
| 69 linkscript_t linkscript = { 0, NULL, -1 }; | |
| 70 | |
| 71 void setup_script() | |
| 72 { | |
|
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73 char *script, *oscript; |
| 117 | 74 long size; |
| 75 | |
| 76 // read the file if needed | |
| 77 if (scriptfile) | |
| 78 { | |
| 79 FILE *f; | |
| 80 long bread; | |
| 81 | |
| 82 f = fopen(scriptfile, "rb"); | |
| 83 if (!f) | |
| 84 { | |
| 85 fprintf(stderr, "Can't open file %s:", scriptfile); | |
| 86 perror(""); | |
| 87 exit(1); | |
| 88 } | |
| 89 fseek(f, 0, SEEK_END); | |
| 90 size = ftell(f); | |
| 91 rewind(f); | |
| 92 | |
| 93 script = lw_malloc(size + 2); | |
| 94 | |
| 95 bread = fread(script, 1, size, f); | |
| 96 if (bread < size) | |
| 97 { | |
| 98 fprintf(stderr, "Short read on file %s (%ld/%ld):", scriptfile, bread, size); | |
| 99 perror(""); | |
| 100 exit(1); | |
| 101 } | |
| 102 fclose(f); | |
| 103 | |
| 104 script[size] = '\n'; | |
| 105 script[size + 1] = '\0'; | |
| 106 } | |
| 107 else | |
| 108 { | |
| 109 // fetch defaults based on output mode | |
| 110 switch (outformat) | |
| 111 { | |
| 112 case OUTPUT_RAW: | |
| 113 script = raw_script; | |
| 114 break; | |
| 115 | |
| 116 case OUTPUT_DECB: | |
| 117 script = decb_script; | |
| 118 break; | |
| 119 | |
| 187 | 120 case OUTPUT_LWEX0: |
| 121 script = lwex0_script; | |
| 122 break; | |
| 123 | |
| 117 | 124 default: |
| 125 script = simple_script; | |
| 126 break; | |
| 127 } | |
| 128 | |
| 129 size = strlen(script); | |
| 180 | 130 if (nscriptls) |
| 131 { | |
| 132 char *rscript; | |
| 133 int i; | |
| 134 // prepend the "extra" script lines | |
| 135 for (i = 0; i < nscriptls; i++) | |
| 136 size += strlen(scriptls[i]) + 1; | |
| 137 | |
| 138 rscript = lw_malloc(size + 1); | |
| 139 oscript = rscript; | |
| 140 for (i = 0; i < nscriptls; i++) | |
| 141 { | |
| 142 oscript += sprintf(oscript, "%s\n", scriptls[i]); | |
| 143 } | |
| 144 strcpy(oscript, script); | |
| 145 script = rscript; | |
| 146 } | |
| 117 | 147 } |
| 148 | |
| 187 | 149 if (outformat == OUTPUT_LWEX0) |
| 150 linkscript.stacksize = 0x100; | |
| 151 | |
|
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152 oscript = script; |
| 117 | 153 // now parse the script file |
| 154 while (*script) | |
| 155 { | |
| 156 char *ptr, *ptr2, *line; | |
| 157 | |
| 158 for (ptr = script; *ptr && *ptr != '\n' && *ptr != '\r'; ptr++) | |
| 159 /* do nothing */ ; | |
| 160 | |
| 161 line = lw_malloc(ptr - script + 1); | |
| 162 memcpy(line, script, ptr - script); | |
| 163 line[ptr - script] = '\0'; | |
| 164 | |
| 165 // skip line terms | |
| 166 for (script = ptr + 1; *script == '\n' || *script == '\r'; script++) | |
| 167 /* do nothing */ ; | |
| 168 | |
| 169 // ignore leading whitespace | |
| 170 for (ptr = line; *ptr && isspace(*ptr); ptr++) | |
| 171 /* do nothing */ ; | |
| 172 | |
| 173 // ignore blank lines | |
| 174 if (!*ptr) | |
| 175 continue; | |
| 176 | |
| 177 for (ptr = line; *ptr && !isspace(*ptr); ptr++) | |
| 178 /* do nothing */ ; | |
| 179 | |
| 180 // now ptr points to the char past the first word | |
| 181 // NUL it out | |
| 182 if (*ptr) | |
| 183 *ptr++ = '\0'; | |
| 184 | |
| 185 // skip spaces after the first word | |
| 186 for ( ; *ptr && isspace(*ptr); ptr++) | |
| 187 /* do nothing */ ; | |
| 188 | |
| 189 if (!strcmp(line, "pad")) | |
| 190 { | |
| 191 // padding | |
| 192 // parse the hex number and stow it | |
| 193 linkscript.padsize = strtol(ptr, NULL, 16); | |
| 194 if (linkscript.padsize < 0) | |
| 195 linkscript.padsize = 0; | |
| 196 } | |
| 187 | 197 else if (!strcmp(line, "stacksize")) |
| 198 { | |
| 199 // stack size for targets that support it | |
| 200 // parse the hex number and stow it | |
| 201 linkscript.padsize = strtol(ptr, NULL, 16); | |
| 202 if (linkscript.stacksize < 0) | |
| 203 linkscript.stacksize = 0x100; | |
| 204 } | |
| 121 | 205 else if (!strcmp(line, "entry")) |
| 206 { | |
| 207 int eaddr; | |
| 208 | |
| 209 eaddr = strtol(ptr, &ptr2, 16); | |
| 210 if (*ptr2) | |
| 211 { | |
| 212 linkscript.execaddr = -1; | |
| 213 linkscript.execsym = lw_strdup(ptr); | |
| 214 } | |
| 215 else | |
| 216 { | |
| 217 linkscript.execaddr = eaddr; | |
| 218 linkscript.execsym = NULL; | |
| 219 } | |
| 220 } | |
| 117 | 221 else if (!strcmp(line, "section")) |
| 222 { | |
| 223 // section | |
| 224 // parse out the section name and flags | |
| 225 for (ptr2 = ptr; *ptr2 && !isspace(*ptr2); ptr2++) | |
| 226 /* do nothing */ ; | |
| 227 | |
| 228 if (*ptr2) | |
| 229 *ptr2++ = '\0'; | |
| 230 | |
| 231 while (*ptr2 && isspace(*ptr2)) | |
| 232 ptr2++; | |
| 233 | |
| 234 // ptr now points to the section name and flags and ptr2 | |
| 235 // to the first non-space character following | |
| 236 | |
| 237 // then look for "load <addr>" clause | |
| 238 if (*ptr2) | |
| 239 { | |
| 240 if (!strncmp(ptr2, "load", 4)) | |
| 241 { | |
| 242 ptr2 += 4; | |
| 243 while (*ptr2 && isspace(*ptr2)) | |
| 244 ptr2++; | |
| 245 | |
| 246 } | |
| 247 else | |
| 248 { | |
| 249 fprintf(stderr, "%s: bad script\n", scriptfile); | |
| 250 exit(1); | |
| 251 } | |
| 252 } | |
| 253 | |
| 254 // now ptr2 points to the load address if there is one | |
| 255 // or NUL if not | |
| 256 linkscript.lines = lw_realloc(linkscript.lines, sizeof(struct scriptline_s) * (linkscript.nlines + 1)); | |
| 257 | |
| 258 linkscript.lines[linkscript.nlines].noflags = 0; | |
| 259 linkscript.lines[linkscript.nlines].yesflags = 0; | |
| 260 if (*ptr2) | |
| 261 linkscript.lines[linkscript.nlines].loadat = strtol(ptr2, NULL, 16); | |
| 262 else | |
| 263 linkscript.lines[linkscript.nlines].loadat = -1; | |
| 264 for (ptr2 = ptr; *ptr2 && *ptr2 != ','; ptr2++) | |
| 265 /* do nothing */ ; | |
| 266 if (*ptr2) | |
| 267 { | |
| 268 *ptr2++ = '\0'; | |
| 269 if (!strcmp(ptr2, "!bss")) | |
| 270 { | |
| 271 linkscript.lines[linkscript.nlines].noflags = SECTION_BSS; | |
| 272 } | |
| 273 else if (!strcmp(ptr2, "bss")) | |
| 274 { | |
| 275 linkscript.lines[linkscript.nlines].yesflags = SECTION_BSS; | |
| 276 } | |
| 277 else | |
| 278 { | |
| 279 fprintf(stderr, "%s: bad script\n", scriptfile); | |
| 280 exit(1); | |
| 281 } | |
| 282 } | |
| 119 | 283 if (ptr[0] == '*' && ptr[1] == '\0') |
| 284 linkscript.lines[linkscript.nlines].sectname = NULL; | |
| 285 else | |
| 286 linkscript.lines[linkscript.nlines].sectname = lw_strdup(ptr); | |
| 117 | 287 linkscript.nlines++; |
| 288 } | |
| 289 else | |
| 290 { | |
| 291 fprintf(stderr, "%s: bad script\n", scriptfile); | |
| 292 exit(1); | |
| 293 } | |
| 294 lw_free(line); | |
| 295 } | |
| 296 | |
| 180 | 297 if (scriptfile || nscriptls) |
|
125
f9bfc2986023
Actually allow script file to be specified and fix segfault on parsing script file
lost
parents:
124
diff
changeset
|
298 lw_free(oscript); |
| 117 | 299 } |