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annotate lwlink/script.c @ 240:b43e3e23583c
Added not about likely incompatibilities with source code from other assemblers when using the OS9 module target
| author | lost |
|---|---|
| date | Sun, 16 Aug 2009 00:25:55 +0000 |
| parents | 402a035220ed |
| children | c602f6eca3ed |
| 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 | |
| 212 | 24 #include <config.h> |
| 117 | 25 |
| 26 #include <errno.h> | |
| 27 #include <stdio.h> | |
| 28 #include <stdlib.h> | |
| 29 #include <string.h> | |
| 30 | |
| 31 #include "lwlink.h" | |
| 32 #include "util.h" | |
| 33 | |
| 34 // the built-in DECB target linker script | |
| 35 static char *decb_script = | |
| 124 | 36 "section init load 2000\n" |
| 117 | 37 "section code\n" |
| 38 "section *,!bss\n" | |
| 39 "section *,bss\n" | |
| 121 | 40 "entry 2000\n" |
| 117 | 41 ; |
| 42 | |
| 43 // the built-in RAW target linker script | |
| 44 static char *raw_script = | |
| 124 | 45 "section init load 0000\n" |
| 117 | 46 "section code\n" |
| 47 "section *,!bss\n" | |
| 48 "section *,bss\n" | |
| 49 ; | |
| 50 | |
| 187 | 51 static char *lwex0_script = |
| 52 "section init load 0100\n" | |
| 53 "section .text\n" | |
| 54 "section .data\n" | |
| 55 "section *,!bss\n" | |
| 56 "section *,bss\n" | |
| 219 | 57 "entry __start\n" |
| 187 | 58 "stacksize 0100\n" // default 256 byte stack |
| 59 ; | |
| 60 | |
| 117 | 61 // the "simple" script |
| 62 static char *simple_script = | |
| 63 "section *,!bss\n" | |
| 64 "section *,bss\n" | |
| 65 ; | |
| 66 | |
| 67 linkscript_t linkscript = { 0, NULL, -1 }; | |
| 68 | |
| 69 void setup_script() | |
| 70 { | |
|
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71 char *script, *oscript; |
| 117 | 72 long size; |
| 73 | |
| 74 // read the file if needed | |
| 75 if (scriptfile) | |
| 76 { | |
| 77 FILE *f; | |
| 78 long bread; | |
| 79 | |
| 80 f = fopen(scriptfile, "rb"); | |
| 81 if (!f) | |
| 82 { | |
| 83 fprintf(stderr, "Can't open file %s:", scriptfile); | |
| 84 perror(""); | |
| 85 exit(1); | |
| 86 } | |
| 87 fseek(f, 0, SEEK_END); | |
| 88 size = ftell(f); | |
| 89 rewind(f); | |
| 90 | |
| 91 script = lw_malloc(size + 2); | |
| 92 | |
| 93 bread = fread(script, 1, size, f); | |
| 94 if (bread < size) | |
| 95 { | |
| 96 fprintf(stderr, "Short read on file %s (%ld/%ld):", scriptfile, bread, size); | |
| 97 perror(""); | |
| 98 exit(1); | |
| 99 } | |
| 100 fclose(f); | |
| 101 | |
| 102 script[size] = '\n'; | |
| 103 script[size + 1] = '\0'; | |
| 104 } | |
| 105 else | |
| 106 { | |
| 107 // fetch defaults based on output mode | |
| 108 switch (outformat) | |
| 109 { | |
| 110 case OUTPUT_RAW: | |
| 111 script = raw_script; | |
| 112 break; | |
| 113 | |
| 114 case OUTPUT_DECB: | |
| 115 script = decb_script; | |
| 116 break; | |
| 117 | |
| 187 | 118 case OUTPUT_LWEX0: |
| 119 script = lwex0_script; | |
| 120 break; | |
| 121 | |
| 117 | 122 default: |
| 123 script = simple_script; | |
| 124 break; | |
| 125 } | |
| 126 | |
| 127 size = strlen(script); | |
| 180 | 128 if (nscriptls) |
| 129 { | |
| 130 char *rscript; | |
| 131 int i; | |
| 132 // prepend the "extra" script lines | |
| 133 for (i = 0; i < nscriptls; i++) | |
| 134 size += strlen(scriptls[i]) + 1; | |
| 135 | |
| 136 rscript = lw_malloc(size + 1); | |
| 137 oscript = rscript; | |
| 138 for (i = 0; i < nscriptls; i++) | |
| 139 { | |
| 140 oscript += sprintf(oscript, "%s\n", scriptls[i]); | |
| 141 } | |
| 142 strcpy(oscript, script); | |
| 143 script = rscript; | |
| 144 } | |
| 117 | 145 } |
| 146 | |
| 187 | 147 if (outformat == OUTPUT_LWEX0) |
| 148 linkscript.stacksize = 0x100; | |
| 149 | |
|
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150 oscript = script; |
| 117 | 151 // now parse the script file |
| 152 while (*script) | |
| 153 { | |
| 154 char *ptr, *ptr2, *line; | |
| 155 | |
| 156 for (ptr = script; *ptr && *ptr != '\n' && *ptr != '\r'; ptr++) | |
| 157 /* do nothing */ ; | |
| 158 | |
| 159 line = lw_malloc(ptr - script + 1); | |
| 160 memcpy(line, script, ptr - script); | |
| 161 line[ptr - script] = '\0'; | |
| 162 | |
| 163 // skip line terms | |
| 164 for (script = ptr + 1; *script == '\n' || *script == '\r'; script++) | |
| 165 /* do nothing */ ; | |
| 166 | |
| 167 // ignore leading whitespace | |
| 168 for (ptr = line; *ptr && isspace(*ptr); ptr++) | |
| 169 /* do nothing */ ; | |
| 170 | |
| 171 // ignore blank lines | |
| 172 if (!*ptr) | |
| 173 continue; | |
| 174 | |
| 175 for (ptr = line; *ptr && !isspace(*ptr); ptr++) | |
| 176 /* do nothing */ ; | |
| 177 | |
| 178 // now ptr points to the char past the first word | |
| 179 // NUL it out | |
| 180 if (*ptr) | |
| 181 *ptr++ = '\0'; | |
| 182 | |
| 183 // skip spaces after the first word | |
| 184 for ( ; *ptr && isspace(*ptr); ptr++) | |
| 185 /* do nothing */ ; | |
| 186 | |
| 187 if (!strcmp(line, "pad")) | |
| 188 { | |
| 189 // padding | |
| 190 // parse the hex number and stow it | |
| 191 linkscript.padsize = strtol(ptr, NULL, 16); | |
| 192 if (linkscript.padsize < 0) | |
| 193 linkscript.padsize = 0; | |
| 194 } | |
| 187 | 195 else if (!strcmp(line, "stacksize")) |
| 196 { | |
| 197 // stack size for targets that support it | |
| 198 // parse the hex number and stow it | |
| 199 linkscript.padsize = strtol(ptr, NULL, 16); | |
| 200 if (linkscript.stacksize < 0) | |
| 201 linkscript.stacksize = 0x100; | |
| 202 } | |
| 121 | 203 else if (!strcmp(line, "entry")) |
| 204 { | |
| 205 int eaddr; | |
| 206 | |
| 207 eaddr = strtol(ptr, &ptr2, 16); | |
| 208 if (*ptr2) | |
| 209 { | |
| 210 linkscript.execaddr = -1; | |
| 211 linkscript.execsym = lw_strdup(ptr); | |
| 212 } | |
| 213 else | |
| 214 { | |
| 215 linkscript.execaddr = eaddr; | |
| 216 linkscript.execsym = NULL; | |
| 217 } | |
| 218 } | |
| 117 | 219 else if (!strcmp(line, "section")) |
| 220 { | |
| 221 // section | |
| 222 // parse out the section name and flags | |
| 223 for (ptr2 = ptr; *ptr2 && !isspace(*ptr2); ptr2++) | |
| 224 /* do nothing */ ; | |
| 225 | |
| 226 if (*ptr2) | |
| 227 *ptr2++ = '\0'; | |
| 228 | |
| 229 while (*ptr2 && isspace(*ptr2)) | |
| 230 ptr2++; | |
| 231 | |
| 232 // ptr now points to the section name and flags and ptr2 | |
| 233 // to the first non-space character following | |
| 234 | |
| 235 // then look for "load <addr>" clause | |
| 236 if (*ptr2) | |
| 237 { | |
| 238 if (!strncmp(ptr2, "load", 4)) | |
| 239 { | |
| 240 ptr2 += 4; | |
| 241 while (*ptr2 && isspace(*ptr2)) | |
| 242 ptr2++; | |
| 243 | |
| 244 } | |
| 245 else | |
| 246 { | |
| 247 fprintf(stderr, "%s: bad script\n", scriptfile); | |
| 248 exit(1); | |
| 249 } | |
| 250 } | |
| 251 | |
| 252 // now ptr2 points to the load address if there is one | |
| 253 // or NUL if not | |
| 254 linkscript.lines = lw_realloc(linkscript.lines, sizeof(struct scriptline_s) * (linkscript.nlines + 1)); | |
| 255 | |
| 256 linkscript.lines[linkscript.nlines].noflags = 0; | |
| 257 linkscript.lines[linkscript.nlines].yesflags = 0; | |
| 258 if (*ptr2) | |
| 259 linkscript.lines[linkscript.nlines].loadat = strtol(ptr2, NULL, 16); | |
| 260 else | |
| 261 linkscript.lines[linkscript.nlines].loadat = -1; | |
| 262 for (ptr2 = ptr; *ptr2 && *ptr2 != ','; ptr2++) | |
| 263 /* do nothing */ ; | |
| 264 if (*ptr2) | |
| 265 { | |
| 266 *ptr2++ = '\0'; | |
| 267 if (!strcmp(ptr2, "!bss")) | |
| 268 { | |
| 269 linkscript.lines[linkscript.nlines].noflags = SECTION_BSS; | |
| 270 } | |
| 271 else if (!strcmp(ptr2, "bss")) | |
| 272 { | |
| 273 linkscript.lines[linkscript.nlines].yesflags = SECTION_BSS; | |
| 274 } | |
| 275 else | |
| 276 { | |
| 277 fprintf(stderr, "%s: bad script\n", scriptfile); | |
| 278 exit(1); | |
| 279 } | |
| 280 } | |
| 119 | 281 if (ptr[0] == '*' && ptr[1] == '\0') |
| 282 linkscript.lines[linkscript.nlines].sectname = NULL; | |
| 283 else | |
| 284 linkscript.lines[linkscript.nlines].sectname = lw_strdup(ptr); | |
| 117 | 285 linkscript.nlines++; |
| 286 } | |
| 287 else | |
| 288 { | |
| 289 fprintf(stderr, "%s: bad script\n", scriptfile); | |
| 290 exit(1); | |
| 291 } | |
| 292 lw_free(line); | |
| 293 } | |
| 294 | |
| 180 | 295 if (scriptfile || nscriptls) |
|
125
f9bfc2986023
Actually allow script file to be specified and fix segfault on parsing script file
lost
parents:
124
diff
changeset
|
296 lw_free(oscript); |
| 117 | 297 } |