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Commit | Line | Data |
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1da177e4 LT |
1 | /* Generate assembler source containing symbol information |
2 | * | |
3 | * Copyright 2002 by Kai Germaschewski | |
4 | * | |
5 | * This software may be used and distributed according to the terms | |
6 | * of the GNU General Public License, incorporated herein by reference. | |
7 | * | |
8 | * Usage: nm -n vmlinux | scripts/kallsyms [--all-symbols] > symbols.S | |
9 | * | |
1da177e4 LT |
10 | * Table compression uses all the unused char codes on the symbols and |
11 | * maps these to the most used substrings (tokens). For instance, it might | |
12 | * map char code 0xF7 to represent "write_" and then in every symbol where | |
13 | * "write_" appears it can be replaced by 0xF7, saving 5 bytes. | |
14 | * The used codes themselves are also placed in the table so that the | |
15 | * decompresion can work without "special cases". | |
16 | * Applied to kernel symbols, this usually produces a compression ratio | |
17 | * of about 50%. | |
18 | * | |
19 | */ | |
20 | ||
21 | #include <stdio.h> | |
22 | #include <stdlib.h> | |
23 | #include <string.h> | |
24 | #include <ctype.h> | |
25 | ||
17b1f0de MF |
26 | #ifndef ARRAY_SIZE |
27 | #define ARRAY_SIZE(arr) (sizeof(arr) / sizeof(arr[0])) | |
28 | #endif | |
29 | ||
9281acea | 30 | #define KSYM_NAME_LEN 128 |
1da177e4 | 31 | |
1da177e4 LT |
32 | struct sym_entry { |
33 | unsigned long long addr; | |
b3dbb4ec | 34 | unsigned int len; |
f2df3f65 | 35 | unsigned int start_pos; |
1da177e4 LT |
36 | unsigned char *sym; |
37 | }; | |
38 | ||
17b1f0de MF |
39 | struct text_range { |
40 | const char *stext, *etext; | |
41 | unsigned long long start, end; | |
42 | }; | |
43 | ||
44 | static unsigned long long _text; | |
45 | static struct text_range text_ranges[] = { | |
46 | { "_stext", "_etext" }, | |
47 | { "_sinittext", "_einittext" }, | |
48 | { "_stext_l1", "_etext_l1" }, /* Blackfin on-chip L1 inst SRAM */ | |
49 | { "_stext_l2", "_etext_l2" }, /* Blackfin on-chip L2 SRAM */ | |
50 | }; | |
51 | #define text_range_text (&text_ranges[0]) | |
52 | #define text_range_inittext (&text_ranges[1]) | |
53 | ||
1da177e4 | 54 | static struct sym_entry *table; |
b3dbb4ec | 55 | static unsigned int table_size, table_cnt; |
1da177e4 | 56 | static int all_symbols = 0; |
41f11a4f | 57 | static char symbol_prefix_char = '\0'; |
1da177e4 | 58 | |
b3dbb4ec | 59 | int token_profit[0x10000]; |
1da177e4 LT |
60 | |
61 | /* the table that holds the result of the compression */ | |
b3dbb4ec | 62 | unsigned char best_table[256][2]; |
1da177e4 LT |
63 | unsigned char best_table_len[256]; |
64 | ||
65 | ||
b3dbb4ec | 66 | static void usage(void) |
1da177e4 | 67 | { |
41f11a4f | 68 | fprintf(stderr, "Usage: kallsyms [--all-symbols] [--symbol-prefix=<prefix char>] < in.map > out.S\n"); |
1da177e4 LT |
69 | exit(1); |
70 | } | |
71 | ||
72 | /* | |
73 | * This ignores the intensely annoying "mapping symbols" found | |
74 | * in ARM ELF files: $a, $t and $d. | |
75 | */ | |
b3dbb4ec | 76 | static inline int is_arm_mapping_symbol(const char *str) |
1da177e4 LT |
77 | { |
78 | return str[0] == '$' && strchr("atd", str[1]) | |
79 | && (str[2] == '\0' || str[2] == '.'); | |
80 | } | |
81 | ||
17b1f0de MF |
82 | static int read_symbol_tr(const char *sym, unsigned long long addr) |
83 | { | |
84 | size_t i; | |
85 | struct text_range *tr; | |
86 | ||
87 | for (i = 0; i < ARRAY_SIZE(text_ranges); ++i) { | |
88 | tr = &text_ranges[i]; | |
89 | ||
90 | if (strcmp(sym, tr->stext) == 0) { | |
91 | tr->start = addr; | |
92 | return 0; | |
93 | } else if (strcmp(sym, tr->etext) == 0) { | |
94 | tr->end = addr; | |
95 | return 0; | |
96 | } | |
97 | } | |
98 | ||
99 | return 1; | |
100 | } | |
101 | ||
b3dbb4ec | 102 | static int read_symbol(FILE *in, struct sym_entry *s) |
1da177e4 LT |
103 | { |
104 | char str[500]; | |
b3dbb4ec | 105 | char *sym, stype; |
1da177e4 LT |
106 | int rc; |
107 | ||
b3dbb4ec | 108 | rc = fscanf(in, "%llx %c %499s\n", &s->addr, &stype, str); |
1da177e4 LT |
109 | if (rc != 3) { |
110 | if (rc != EOF) { | |
71d41aed HC |
111 | /* skip line. sym is used as dummy to |
112 | * shut of "warn_unused_result" warning. | |
113 | */ | |
114 | sym = fgets(str, 500, in); | |
1da177e4 LT |
115 | } |
116 | return -1; | |
117 | } | |
118 | ||
41f11a4f YS |
119 | sym = str; |
120 | /* skip prefix char */ | |
121 | if (symbol_prefix_char && str[0] == symbol_prefix_char) | |
122 | sym++; | |
123 | ||
1da177e4 | 124 | /* Ignore most absolute/undefined (?) symbols. */ |
fd593d12 EB |
125 | if (strcmp(sym, "_text") == 0) |
126 | _text = s->addr; | |
17b1f0de MF |
127 | else if (read_symbol_tr(sym, s->addr) == 0) |
128 | /* nothing to do */; | |
b3dbb4ec | 129 | else if (toupper(stype) == 'A') |
1da177e4 LT |
130 | { |
131 | /* Keep these useful absolute symbols */ | |
41f11a4f YS |
132 | if (strcmp(sym, "__kernel_syscall_via_break") && |
133 | strcmp(sym, "__kernel_syscall_via_epc") && | |
134 | strcmp(sym, "__kernel_sigtramp") && | |
135 | strcmp(sym, "__gp")) | |
1da177e4 LT |
136 | return -1; |
137 | ||
138 | } | |
b3dbb4ec | 139 | else if (toupper(stype) == 'U' || |
41f11a4f | 140 | is_arm_mapping_symbol(sym)) |
1da177e4 | 141 | return -1; |
6f00df24 RB |
142 | /* exclude also MIPS ELF local symbols ($L123 instead of .L123) */ |
143 | else if (str[0] == '$') | |
144 | return -1; | |
aab34ac8 SR |
145 | /* exclude debugging symbols */ |
146 | else if (stype == 'N') | |
147 | return -1; | |
1da177e4 LT |
148 | |
149 | /* include the type field in the symbol name, so that it gets | |
150 | * compressed together */ | |
151 | s->len = strlen(str) + 1; | |
b3dbb4ec | 152 | s->sym = malloc(s->len + 1); |
f1a136e0 JJ |
153 | if (!s->sym) { |
154 | fprintf(stderr, "kallsyms failure: " | |
155 | "unable to allocate required amount of memory\n"); | |
156 | exit(EXIT_FAILURE); | |
157 | } | |
b3dbb4ec PM |
158 | strcpy((char *)s->sym + 1, str); |
159 | s->sym[0] = stype; | |
1da177e4 LT |
160 | |
161 | return 0; | |
162 | } | |
163 | ||
17b1f0de MF |
164 | static int symbol_valid_tr(struct sym_entry *s) |
165 | { | |
166 | size_t i; | |
167 | struct text_range *tr; | |
168 | ||
169 | for (i = 0; i < ARRAY_SIZE(text_ranges); ++i) { | |
170 | tr = &text_ranges[i]; | |
171 | ||
ac6ca5c8 MF |
172 | if (s->addr >= tr->start && s->addr <= tr->end) |
173 | return 1; | |
17b1f0de MF |
174 | } |
175 | ||
ac6ca5c8 | 176 | return 0; |
17b1f0de MF |
177 | } |
178 | ||
b3dbb4ec | 179 | static int symbol_valid(struct sym_entry *s) |
1da177e4 LT |
180 | { |
181 | /* Symbols which vary between passes. Passes 1 and 2 must have | |
2ea03891 SR |
182 | * identical symbol lists. The kallsyms_* symbols below are only added |
183 | * after pass 1, they would be included in pass 2 when --all-symbols is | |
184 | * specified so exclude them to get a stable symbol list. | |
1da177e4 LT |
185 | */ |
186 | static char *special_symbols[] = { | |
2ea03891 SR |
187 | "kallsyms_addresses", |
188 | "kallsyms_num_syms", | |
189 | "kallsyms_names", | |
190 | "kallsyms_markers", | |
191 | "kallsyms_token_table", | |
192 | "kallsyms_token_index", | |
193 | ||
1da177e4 LT |
194 | /* Exclude linker generated symbols which vary between passes */ |
195 | "_SDA_BASE_", /* ppc */ | |
196 | "_SDA2_BASE_", /* ppc */ | |
197 | NULL }; | |
198 | int i; | |
41f11a4f YS |
199 | int offset = 1; |
200 | ||
201 | /* skip prefix char */ | |
202 | if (symbol_prefix_char && *(s->sym + 1) == symbol_prefix_char) | |
203 | offset++; | |
1da177e4 LT |
204 | |
205 | /* if --all-symbols is not specified, then symbols outside the text | |
206 | * and inittext sections are discarded */ | |
207 | if (!all_symbols) { | |
17b1f0de | 208 | if (symbol_valid_tr(s) == 0) |
1da177e4 LT |
209 | return 0; |
210 | /* Corner case. Discard any symbols with the same value as | |
a3b81113 RG |
211 | * _etext _einittext; they can move between pass 1 and 2 when |
212 | * the kallsyms data are added. If these symbols move then | |
213 | * they may get dropped in pass 2, which breaks the kallsyms | |
214 | * rules. | |
1da177e4 | 215 | */ |
17b1f0de MF |
216 | if ((s->addr == text_range_text->end && |
217 | strcmp((char *)s->sym + offset, text_range_text->etext)) || | |
218 | (s->addr == text_range_inittext->end && | |
219 | strcmp((char *)s->sym + offset, text_range_inittext->etext))) | |
1da177e4 LT |
220 | return 0; |
221 | } | |
222 | ||
223 | /* Exclude symbols which vary between passes. */ | |
2ea03891 | 224 | if (strstr((char *)s->sym + offset, "_compiled.")) |
1da177e4 LT |
225 | return 0; |
226 | ||
227 | for (i = 0; special_symbols[i]; i++) | |
b3dbb4ec | 228 | if( strcmp((char *)s->sym + offset, special_symbols[i]) == 0 ) |
1da177e4 LT |
229 | return 0; |
230 | ||
231 | return 1; | |
232 | } | |
233 | ||
b3dbb4ec | 234 | static void read_map(FILE *in) |
1da177e4 LT |
235 | { |
236 | while (!feof(in)) { | |
b3dbb4ec PM |
237 | if (table_cnt >= table_size) { |
238 | table_size += 10000; | |
239 | table = realloc(table, sizeof(*table) * table_size); | |
1da177e4 LT |
240 | if (!table) { |
241 | fprintf(stderr, "out of memory\n"); | |
242 | exit (1); | |
243 | } | |
244 | } | |
f2df3f65 PM |
245 | if (read_symbol(in, &table[table_cnt]) == 0) { |
246 | table[table_cnt].start_pos = table_cnt; | |
b3dbb4ec | 247 | table_cnt++; |
f2df3f65 | 248 | } |
1da177e4 LT |
249 | } |
250 | } | |
251 | ||
252 | static void output_label(char *label) | |
253 | { | |
41f11a4f YS |
254 | if (symbol_prefix_char) |
255 | printf(".globl %c%s\n", symbol_prefix_char, label); | |
256 | else | |
257 | printf(".globl %s\n", label); | |
1da177e4 | 258 | printf("\tALGN\n"); |
41f11a4f YS |
259 | if (symbol_prefix_char) |
260 | printf("%c%s:\n", symbol_prefix_char, label); | |
261 | else | |
262 | printf("%s:\n", label); | |
1da177e4 LT |
263 | } |
264 | ||
265 | /* uncompress a compressed symbol. When this function is called, the best table | |
266 | * might still be compressed itself, so the function needs to be recursive */ | |
267 | static int expand_symbol(unsigned char *data, int len, char *result) | |
268 | { | |
269 | int c, rlen, total=0; | |
270 | ||
271 | while (len) { | |
272 | c = *data; | |
273 | /* if the table holds a single char that is the same as the one | |
274 | * we are looking for, then end the search */ | |
275 | if (best_table[c][0]==c && best_table_len[c]==1) { | |
276 | *result++ = c; | |
277 | total++; | |
278 | } else { | |
279 | /* if not, recurse and expand */ | |
280 | rlen = expand_symbol(best_table[c], best_table_len[c], result); | |
281 | total += rlen; | |
282 | result += rlen; | |
283 | } | |
284 | data++; | |
285 | len--; | |
286 | } | |
287 | *result=0; | |
288 | ||
289 | return total; | |
290 | } | |
291 | ||
b3dbb4ec | 292 | static void write_src(void) |
1da177e4 | 293 | { |
b3dbb4ec | 294 | unsigned int i, k, off; |
1da177e4 LT |
295 | unsigned int best_idx[256]; |
296 | unsigned int *markers; | |
9281acea | 297 | char buf[KSYM_NAME_LEN]; |
1da177e4 LT |
298 | |
299 | printf("#include <asm/types.h>\n"); | |
300 | printf("#if BITS_PER_LONG == 64\n"); | |
301 | printf("#define PTR .quad\n"); | |
302 | printf("#define ALGN .align 8\n"); | |
303 | printf("#else\n"); | |
304 | printf("#define PTR .long\n"); | |
305 | printf("#define ALGN .align 4\n"); | |
306 | printf("#endif\n"); | |
307 | ||
aad09470 | 308 | printf("\t.section .rodata, \"a\"\n"); |
1da177e4 | 309 | |
fd593d12 EB |
310 | /* Provide proper symbols relocatability by their '_text' |
311 | * relativeness. The symbol names cannot be used to construct | |
312 | * normal symbol references as the list of symbols contains | |
313 | * symbols that are declared static and are private to their | |
314 | * .o files. This prevents .tmp_kallsyms.o or any other | |
315 | * object from referencing them. | |
316 | */ | |
1da177e4 | 317 | output_label("kallsyms_addresses"); |
b3dbb4ec | 318 | for (i = 0; i < table_cnt; i++) { |
fd593d12 | 319 | if (toupper(table[i].sym[0]) != 'A') { |
2c22d8ba VG |
320 | if (_text <= table[i].addr) |
321 | printf("\tPTR\t_text + %#llx\n", | |
322 | table[i].addr - _text); | |
323 | else | |
324 | printf("\tPTR\t_text - %#llx\n", | |
325 | _text - table[i].addr); | |
fd593d12 EB |
326 | } else { |
327 | printf("\tPTR\t%#llx\n", table[i].addr); | |
328 | } | |
1da177e4 LT |
329 | } |
330 | printf("\n"); | |
331 | ||
332 | output_label("kallsyms_num_syms"); | |
b3dbb4ec | 333 | printf("\tPTR\t%d\n", table_cnt); |
1da177e4 LT |
334 | printf("\n"); |
335 | ||
336 | /* table of offset markers, that give the offset in the compressed stream | |
337 | * every 256 symbols */ | |
f1a136e0 JJ |
338 | markers = malloc(sizeof(unsigned int) * ((table_cnt + 255) / 256)); |
339 | if (!markers) { | |
340 | fprintf(stderr, "kallsyms failure: " | |
341 | "unable to allocate required memory\n"); | |
342 | exit(EXIT_FAILURE); | |
343 | } | |
1da177e4 LT |
344 | |
345 | output_label("kallsyms_names"); | |
1da177e4 | 346 | off = 0; |
b3dbb4ec PM |
347 | for (i = 0; i < table_cnt; i++) { |
348 | if ((i & 0xFF) == 0) | |
349 | markers[i >> 8] = off; | |
1da177e4 LT |
350 | |
351 | printf("\t.byte 0x%02x", table[i].len); | |
352 | for (k = 0; k < table[i].len; k++) | |
353 | printf(", 0x%02x", table[i].sym[k]); | |
354 | printf("\n"); | |
355 | ||
356 | off += table[i].len + 1; | |
1da177e4 LT |
357 | } |
358 | printf("\n"); | |
359 | ||
360 | output_label("kallsyms_markers"); | |
b3dbb4ec | 361 | for (i = 0; i < ((table_cnt + 255) >> 8); i++) |
1da177e4 LT |
362 | printf("\tPTR\t%d\n", markers[i]); |
363 | printf("\n"); | |
364 | ||
365 | free(markers); | |
366 | ||
367 | output_label("kallsyms_token_table"); | |
368 | off = 0; | |
369 | for (i = 0; i < 256; i++) { | |
370 | best_idx[i] = off; | |
b3dbb4ec | 371 | expand_symbol(best_table[i], best_table_len[i], buf); |
1da177e4 LT |
372 | printf("\t.asciz\t\"%s\"\n", buf); |
373 | off += strlen(buf) + 1; | |
374 | } | |
375 | printf("\n"); | |
376 | ||
377 | output_label("kallsyms_token_index"); | |
378 | for (i = 0; i < 256; i++) | |
379 | printf("\t.short\t%d\n", best_idx[i]); | |
380 | printf("\n"); | |
381 | } | |
382 | ||
383 | ||
384 | /* table lookup compression functions */ | |
385 | ||
1da177e4 LT |
386 | /* count all the possible tokens in a symbol */ |
387 | static void learn_symbol(unsigned char *symbol, int len) | |
388 | { | |
389 | int i; | |
390 | ||
391 | for (i = 0; i < len - 1; i++) | |
b3dbb4ec | 392 | token_profit[ symbol[i] + (symbol[i + 1] << 8) ]++; |
1da177e4 LT |
393 | } |
394 | ||
395 | /* decrease the count for all the possible tokens in a symbol */ | |
396 | static void forget_symbol(unsigned char *symbol, int len) | |
397 | { | |
398 | int i; | |
399 | ||
400 | for (i = 0; i < len - 1; i++) | |
b3dbb4ec | 401 | token_profit[ symbol[i] + (symbol[i + 1] << 8) ]--; |
1da177e4 LT |
402 | } |
403 | ||
b3dbb4ec | 404 | /* remove all the invalid symbols from the table and do the initial token count */ |
1da177e4 LT |
405 | static void build_initial_tok_table(void) |
406 | { | |
b3dbb4ec | 407 | unsigned int i, pos; |
1da177e4 | 408 | |
b3dbb4ec PM |
409 | pos = 0; |
410 | for (i = 0; i < table_cnt; i++) { | |
1da177e4 | 411 | if ( symbol_valid(&table[i]) ) { |
b3dbb4ec PM |
412 | if (pos != i) |
413 | table[pos] = table[i]; | |
414 | learn_symbol(table[pos].sym, table[pos].len); | |
415 | pos++; | |
1da177e4 | 416 | } |
1da177e4 | 417 | } |
b3dbb4ec | 418 | table_cnt = pos; |
1da177e4 LT |
419 | } |
420 | ||
7c5d249a PM |
421 | static void *find_token(unsigned char *str, int len, unsigned char *token) |
422 | { | |
423 | int i; | |
424 | ||
425 | for (i = 0; i < len - 1; i++) { | |
426 | if (str[i] == token[0] && str[i+1] == token[1]) | |
427 | return &str[i]; | |
428 | } | |
429 | return NULL; | |
430 | } | |
431 | ||
1da177e4 LT |
432 | /* replace a given token in all the valid symbols. Use the sampled symbols |
433 | * to update the counts */ | |
b3dbb4ec | 434 | static void compress_symbols(unsigned char *str, int idx) |
1da177e4 | 435 | { |
b3dbb4ec PM |
436 | unsigned int i, len, size; |
437 | unsigned char *p1, *p2; | |
1da177e4 | 438 | |
b3dbb4ec | 439 | for (i = 0; i < table_cnt; i++) { |
1da177e4 LT |
440 | |
441 | len = table[i].len; | |
b3dbb4ec PM |
442 | p1 = table[i].sym; |
443 | ||
444 | /* find the token on the symbol */ | |
7c5d249a | 445 | p2 = find_token(p1, len, str); |
b3dbb4ec PM |
446 | if (!p2) continue; |
447 | ||
448 | /* decrease the counts for this symbol's tokens */ | |
449 | forget_symbol(table[i].sym, len); | |
450 | ||
451 | size = len; | |
1da177e4 LT |
452 | |
453 | do { | |
b3dbb4ec PM |
454 | *p2 = idx; |
455 | p2++; | |
456 | size -= (p2 - p1); | |
457 | memmove(p2, p2 + 1, size); | |
458 | p1 = p2; | |
459 | len--; | |
460 | ||
461 | if (size < 2) break; | |
462 | ||
1da177e4 | 463 | /* find the token on the symbol */ |
7c5d249a | 464 | p2 = find_token(p1, size, str); |
1da177e4 | 465 | |
b3dbb4ec | 466 | } while (p2); |
1da177e4 | 467 | |
b3dbb4ec | 468 | table[i].len = len; |
1da177e4 | 469 | |
b3dbb4ec PM |
470 | /* increase the counts for this symbol's new tokens */ |
471 | learn_symbol(table[i].sym, len); | |
1da177e4 LT |
472 | } |
473 | } | |
474 | ||
475 | /* search the token with the maximum profit */ | |
b3dbb4ec | 476 | static int find_best_token(void) |
1da177e4 | 477 | { |
b3dbb4ec | 478 | int i, best, bestprofit; |
1da177e4 LT |
479 | |
480 | bestprofit=-10000; | |
b3dbb4ec | 481 | best = 0; |
1da177e4 | 482 | |
b3dbb4ec PM |
483 | for (i = 0; i < 0x10000; i++) { |
484 | if (token_profit[i] > bestprofit) { | |
485 | best = i; | |
486 | bestprofit = token_profit[i]; | |
1da177e4 | 487 | } |
1da177e4 | 488 | } |
1da177e4 LT |
489 | return best; |
490 | } | |
491 | ||
492 | /* this is the core of the algorithm: calculate the "best" table */ | |
493 | static void optimize_result(void) | |
494 | { | |
b3dbb4ec | 495 | int i, best; |
1da177e4 LT |
496 | |
497 | /* using the '\0' symbol last allows compress_symbols to use standard | |
498 | * fast string functions */ | |
499 | for (i = 255; i >= 0; i--) { | |
500 | ||
501 | /* if this table slot is empty (it is not used by an actual | |
502 | * original char code */ | |
503 | if (!best_table_len[i]) { | |
504 | ||
505 | /* find the token with the breates profit value */ | |
506 | best = find_best_token(); | |
507 | ||
508 | /* place it in the "best" table */ | |
b3dbb4ec PM |
509 | best_table_len[i] = 2; |
510 | best_table[i][0] = best & 0xFF; | |
511 | best_table[i][1] = (best >> 8) & 0xFF; | |
1da177e4 LT |
512 | |
513 | /* replace this token in all the valid symbols */ | |
b3dbb4ec | 514 | compress_symbols(best_table[i], i); |
1da177e4 LT |
515 | } |
516 | } | |
517 | } | |
518 | ||
519 | /* start by placing the symbols that are actually used on the table */ | |
520 | static void insert_real_symbols_in_table(void) | |
521 | { | |
b3dbb4ec | 522 | unsigned int i, j, c; |
1da177e4 LT |
523 | |
524 | memset(best_table, 0, sizeof(best_table)); | |
525 | memset(best_table_len, 0, sizeof(best_table_len)); | |
526 | ||
b3dbb4ec PM |
527 | for (i = 0; i < table_cnt; i++) { |
528 | for (j = 0; j < table[i].len; j++) { | |
529 | c = table[i].sym[j]; | |
530 | best_table[c][0]=c; | |
531 | best_table_len[c]=1; | |
1da177e4 LT |
532 | } |
533 | } | |
534 | } | |
535 | ||
536 | static void optimize_token_table(void) | |
537 | { | |
1da177e4 LT |
538 | build_initial_tok_table(); |
539 | ||
540 | insert_real_symbols_in_table(); | |
541 | ||
41f11a4f | 542 | /* When valid symbol is not registered, exit to error */ |
b3dbb4ec | 543 | if (!table_cnt) { |
41f11a4f YS |
544 | fprintf(stderr, "No valid symbol.\n"); |
545 | exit(1); | |
546 | } | |
547 | ||
1da177e4 LT |
548 | optimize_result(); |
549 | } | |
550 | ||
b478b782 LJ |
551 | /* guess for "linker script provide" symbol */ |
552 | static int may_be_linker_script_provide_symbol(const struct sym_entry *se) | |
553 | { | |
554 | const char *symbol = (char *)se->sym + 1; | |
555 | int len = se->len - 1; | |
556 | ||
557 | if (len < 8) | |
558 | return 0; | |
559 | ||
560 | if (symbol[0] != '_' || symbol[1] != '_') | |
561 | return 0; | |
562 | ||
563 | /* __start_XXXXX */ | |
564 | if (!memcmp(symbol + 2, "start_", 6)) | |
565 | return 1; | |
566 | ||
567 | /* __stop_XXXXX */ | |
568 | if (!memcmp(symbol + 2, "stop_", 5)) | |
569 | return 1; | |
570 | ||
571 | /* __end_XXXXX */ | |
572 | if (!memcmp(symbol + 2, "end_", 4)) | |
573 | return 1; | |
574 | ||
575 | /* __XXXXX_start */ | |
576 | if (!memcmp(symbol + len - 6, "_start", 6)) | |
577 | return 1; | |
578 | ||
579 | /* __XXXXX_end */ | |
580 | if (!memcmp(symbol + len - 4, "_end", 4)) | |
581 | return 1; | |
582 | ||
583 | return 0; | |
584 | } | |
585 | ||
586 | static int prefix_underscores_count(const char *str) | |
587 | { | |
588 | const char *tail = str; | |
589 | ||
a9ece53c | 590 | while (*tail == '_') |
b478b782 LJ |
591 | tail++; |
592 | ||
593 | return tail - str; | |
594 | } | |
595 | ||
f2df3f65 PM |
596 | static int compare_symbols(const void *a, const void *b) |
597 | { | |
598 | const struct sym_entry *sa; | |
599 | const struct sym_entry *sb; | |
600 | int wa, wb; | |
601 | ||
602 | sa = a; | |
603 | sb = b; | |
604 | ||
605 | /* sort by address first */ | |
606 | if (sa->addr > sb->addr) | |
607 | return 1; | |
608 | if (sa->addr < sb->addr) | |
609 | return -1; | |
610 | ||
611 | /* sort by "weakness" type */ | |
612 | wa = (sa->sym[0] == 'w') || (sa->sym[0] == 'W'); | |
613 | wb = (sb->sym[0] == 'w') || (sb->sym[0] == 'W'); | |
614 | if (wa != wb) | |
615 | return wa - wb; | |
616 | ||
b478b782 LJ |
617 | /* sort by "linker script provide" type */ |
618 | wa = may_be_linker_script_provide_symbol(sa); | |
619 | wb = may_be_linker_script_provide_symbol(sb); | |
620 | if (wa != wb) | |
621 | return wa - wb; | |
622 | ||
623 | /* sort by the number of prefix underscores */ | |
624 | wa = prefix_underscores_count((const char *)sa->sym + 1); | |
625 | wb = prefix_underscores_count((const char *)sb->sym + 1); | |
626 | if (wa != wb) | |
627 | return wa - wb; | |
628 | ||
f2df3f65 PM |
629 | /* sort by initial order, so that other symbols are left undisturbed */ |
630 | return sa->start_pos - sb->start_pos; | |
631 | } | |
632 | ||
633 | static void sort_symbols(void) | |
634 | { | |
635 | qsort(table, table_cnt, sizeof(struct sym_entry), compare_symbols); | |
636 | } | |
1da177e4 | 637 | |
b3dbb4ec | 638 | int main(int argc, char **argv) |
1da177e4 | 639 | { |
41f11a4f YS |
640 | if (argc >= 2) { |
641 | int i; | |
642 | for (i = 1; i < argc; i++) { | |
643 | if(strcmp(argv[i], "--all-symbols") == 0) | |
644 | all_symbols = 1; | |
645 | else if (strncmp(argv[i], "--symbol-prefix=", 16) == 0) { | |
646 | char *p = &argv[i][16]; | |
647 | /* skip quote */ | |
648 | if ((*p == '"' && *(p+2) == '"') || (*p == '\'' && *(p+2) == '\'')) | |
649 | p++; | |
650 | symbol_prefix_char = *p; | |
651 | } else | |
652 | usage(); | |
653 | } | |
654 | } else if (argc != 1) | |
1da177e4 LT |
655 | usage(); |
656 | ||
657 | read_map(stdin); | |
2ea03891 SR |
658 | sort_symbols(); |
659 | optimize_token_table(); | |
1da177e4 LT |
660 | write_src(); |
661 | ||
662 | return 0; | |
663 | } |