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7d13299d FB |
1 | /* |
2 | * Generic Dynamic compiler generator | |
3 | * | |
4 | * Copyright (c) 2003 Fabrice Bellard | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License as published by | |
8 | * the Free Software Foundation; either version 2 of the License, or | |
9 | * (at your option) any later version. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | * GNU General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License | |
17 | * along with this program; if not, write to the Free Software | |
18 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
19 | */ | |
367e86e8 FB |
20 | #include <stdlib.h> |
21 | #include <stdio.h> | |
04369ff2 | 22 | #include <string.h> |
367e86e8 FB |
23 | #include <stdarg.h> |
24 | #include <inttypes.h> | |
367e86e8 FB |
25 | #include <unistd.h> |
26 | #include <fcntl.h> | |
27 | ||
ce11fedc FB |
28 | #include "config.h" |
29 | ||
30 | /* elf format definitions. We use these macros to test the CPU to | |
31 | allow cross compilation (this tool must be ran on the build | |
32 | platform) */ | |
33 | #if defined(HOST_I386) | |
34 | ||
35 | #define ELF_CLASS ELFCLASS32 | |
36 | #define ELF_ARCH EM_386 | |
37 | #define elf_check_arch(x) ( ((x) == EM_386) || ((x) == EM_486) ) | |
38 | #undef ELF_USES_RELOCA | |
39 | ||
40 | #elif defined(HOST_PPC) | |
41 | ||
42 | #define ELF_CLASS ELFCLASS32 | |
43 | #define ELF_ARCH EM_PPC | |
44 | #define elf_check_arch(x) ((x) == EM_PPC) | |
45 | #define ELF_USES_RELOCA | |
46 | ||
47 | #elif defined(HOST_S390) | |
48 | ||
49 | #define ELF_CLASS ELFCLASS32 | |
50 | #define ELF_ARCH EM_S390 | |
51 | #define elf_check_arch(x) ((x) == EM_S390) | |
52 | #define ELF_USES_RELOCA | |
367e86e8 | 53 | |
ce11fedc FB |
54 | #elif defined(HOST_ALPHA) |
55 | ||
56 | #define ELF_CLASS ELFCLASS64 | |
57 | #define ELF_ARCH EM_ALPHA | |
58 | #define elf_check_arch(x) ((x) == EM_ALPHA) | |
59 | #define ELF_USES_RELOCA | |
60 | ||
61 | #else | |
62 | #error unsupported CPU - please update the code | |
63 | #endif | |
64 | ||
65 | #if ELF_CLASS == ELFCLASS32 | |
66 | typedef int32_t host_long; | |
67 | typedef uint32_t host_ulong; | |
68 | #else | |
69 | typedef int64_t host_long; | |
70 | typedef uint64_t host_ulong; | |
fb3e5849 FB |
71 | #endif |
72 | ||
ce11fedc FB |
73 | #include "elf.h" |
74 | ||
75 | #include "thunk.h" | |
76 | ||
367e86e8 | 77 | /* all dynamically generated functions begin with this code */ |
dc99065b | 78 | #define OP_PREFIX "op_" |
367e86e8 | 79 | |
ce11fedc | 80 | int elf_must_swap(struct elfhdr *h) |
367e86e8 FB |
81 | { |
82 | union { | |
83 | uint32_t i; | |
84 | uint8_t b[4]; | |
85 | } swaptest; | |
86 | ||
87 | swaptest.i = 1; | |
88 | return (h->e_ident[EI_DATA] == ELFDATA2MSB) != | |
89 | (swaptest.b[0] == 0); | |
90 | } | |
91 | ||
92 | void swab16s(uint16_t *p) | |
93 | { | |
94 | *p = bswap16(*p); | |
95 | } | |
96 | ||
97 | void swab32s(uint32_t *p) | |
98 | { | |
99 | *p = bswap32(*p); | |
100 | } | |
101 | ||
ce11fedc | 102 | void swab64s(uint64_t *p) |
367e86e8 FB |
103 | { |
104 | *p = bswap64(*p); | |
105 | } | |
106 | ||
ce11fedc FB |
107 | #if ELF_CLASS == ELFCLASS32 |
108 | #define swabls(x) swab32s(x) | |
109 | #else | |
110 | #define swabls(x) swab64s(x) | |
111 | #endif | |
112 | ||
113 | void elf_swap_ehdr(struct elfhdr *h) | |
367e86e8 FB |
114 | { |
115 | swab16s(&h->e_type); /* Object file type */ | |
116 | swab16s(&h-> e_machine); /* Architecture */ | |
117 | swab32s(&h-> e_version); /* Object file version */ | |
ce11fedc FB |
118 | swabls(&h-> e_entry); /* Entry point virtual address */ |
119 | swabls(&h-> e_phoff); /* Program header table file offset */ | |
120 | swabls(&h-> e_shoff); /* Section header table file offset */ | |
367e86e8 FB |
121 | swab32s(&h-> e_flags); /* Processor-specific flags */ |
122 | swab16s(&h-> e_ehsize); /* ELF header size in bytes */ | |
123 | swab16s(&h-> e_phentsize); /* Program header table entry size */ | |
124 | swab16s(&h-> e_phnum); /* Program header table entry count */ | |
125 | swab16s(&h-> e_shentsize); /* Section header table entry size */ | |
126 | swab16s(&h-> e_shnum); /* Section header table entry count */ | |
127 | swab16s(&h-> e_shstrndx); /* Section header string table index */ | |
128 | } | |
129 | ||
ce11fedc | 130 | void elf_swap_shdr(struct elf_shdr *h) |
367e86e8 FB |
131 | { |
132 | swab32s(&h-> sh_name); /* Section name (string tbl index) */ | |
133 | swab32s(&h-> sh_type); /* Section type */ | |
ce11fedc FB |
134 | swabls(&h-> sh_flags); /* Section flags */ |
135 | swabls(&h-> sh_addr); /* Section virtual addr at execution */ | |
136 | swabls(&h-> sh_offset); /* Section file offset */ | |
137 | swabls(&h-> sh_size); /* Section size in bytes */ | |
367e86e8 FB |
138 | swab32s(&h-> sh_link); /* Link to another section */ |
139 | swab32s(&h-> sh_info); /* Additional section information */ | |
ce11fedc FB |
140 | swabls(&h-> sh_addralign); /* Section alignment */ |
141 | swabls(&h-> sh_entsize); /* Entry size if section holds table */ | |
367e86e8 FB |
142 | } |
143 | ||
ce11fedc | 144 | void elf_swap_phdr(struct elf_phdr *h) |
367e86e8 FB |
145 | { |
146 | swab32s(&h->p_type); /* Segment type */ | |
ce11fedc FB |
147 | swabls(&h->p_offset); /* Segment file offset */ |
148 | swabls(&h->p_vaddr); /* Segment virtual address */ | |
149 | swabls(&h->p_paddr); /* Segment physical address */ | |
150 | swabls(&h->p_filesz); /* Segment size in file */ | |
151 | swabls(&h->p_memsz); /* Segment size in memory */ | |
367e86e8 | 152 | swab32s(&h->p_flags); /* Segment flags */ |
ce11fedc | 153 | swabls(&h->p_align); /* Segment alignment */ |
367e86e8 FB |
154 | } |
155 | ||
156 | int do_swap; | |
367e86e8 FB |
157 | |
158 | uint16_t get16(uint16_t *p) | |
159 | { | |
160 | uint16_t val; | |
161 | val = *p; | |
162 | if (do_swap) | |
163 | val = bswap16(val); | |
164 | return val; | |
165 | } | |
166 | ||
167 | uint32_t get32(uint32_t *p) | |
168 | { | |
169 | uint32_t val; | |
170 | val = *p; | |
171 | if (do_swap) | |
172 | val = bswap32(val); | |
173 | return val; | |
174 | } | |
175 | ||
176 | void put16(uint16_t *p, uint16_t val) | |
177 | { | |
178 | if (do_swap) | |
179 | val = bswap16(val); | |
180 | *p = val; | |
181 | } | |
182 | ||
183 | void put32(uint32_t *p, uint32_t val) | |
184 | { | |
185 | if (do_swap) | |
186 | val = bswap32(val); | |
187 | *p = val; | |
188 | } | |
189 | ||
190 | void __attribute__((noreturn)) error(const char *fmt, ...) | |
191 | { | |
192 | va_list ap; | |
193 | va_start(ap, fmt); | |
194 | fprintf(stderr, "dyngen: "); | |
195 | vfprintf(stderr, fmt, ap); | |
196 | fprintf(stderr, "\n"); | |
197 | va_end(ap); | |
198 | exit(1); | |
199 | } | |
200 | ||
201 | ||
ce11fedc FB |
202 | struct elf_shdr *find_elf_section(struct elf_shdr *shdr, int shnum, const char *shstr, |
203 | const char *name) | |
367e86e8 FB |
204 | { |
205 | int i; | |
206 | const char *shname; | |
ce11fedc | 207 | struct elf_shdr *sec; |
367e86e8 FB |
208 | |
209 | for(i = 0; i < shnum; i++) { | |
210 | sec = &shdr[i]; | |
211 | if (!sec->sh_name) | |
212 | continue; | |
213 | shname = shstr + sec->sh_name; | |
214 | if (!strcmp(shname, name)) | |
215 | return sec; | |
216 | } | |
217 | return NULL; | |
218 | } | |
219 | ||
220 | void *load_data(int fd, long offset, unsigned int size) | |
221 | { | |
222 | char *data; | |
223 | ||
224 | data = malloc(size); | |
225 | if (!data) | |
226 | return NULL; | |
227 | lseek(fd, offset, SEEK_SET); | |
228 | if (read(fd, data, size) != size) { | |
229 | free(data); | |
230 | return NULL; | |
231 | } | |
232 | return data; | |
233 | } | |
234 | ||
235 | int strstart(const char *str, const char *val, const char **ptr) | |
236 | { | |
237 | const char *p, *q; | |
238 | p = str; | |
239 | q = val; | |
240 | while (*q != '\0') { | |
241 | if (*p != *q) | |
242 | return 0; | |
243 | p++; | |
244 | q++; | |
245 | } | |
246 | if (ptr) | |
247 | *ptr = p; | |
248 | return 1; | |
249 | } | |
250 | ||
251 | #define MAX_ARGS 3 | |
252 | ||
253 | /* generate op code */ | |
ce11fedc FB |
254 | void gen_code(const char *name, host_ulong offset, host_ulong size, |
255 | FILE *outfile, uint8_t *text, ELF_RELOC *relocs, int nb_relocs, int reloc_sh_type, | |
256 | ElfW(Sym) *symtab, char *strtab, int gen_switch) | |
367e86e8 FB |
257 | { |
258 | int copy_size = 0; | |
259 | uint8_t *p_start, *p_end; | |
ce11fedc | 260 | int nb_args, i, n; |
367e86e8 FB |
261 | uint8_t args_present[MAX_ARGS]; |
262 | const char *sym_name, *p; | |
ce11fedc | 263 | ELF_RELOC *rel; |
367e86e8 FB |
264 | |
265 | /* compute exact size excluding return instruction */ | |
266 | p_start = text + offset; | |
267 | p_end = p_start + size; | |
ce11fedc | 268 | switch(ELF_ARCH) { |
367e86e8 FB |
269 | case EM_386: |
270 | { | |
271 | uint8_t *p; | |
272 | p = p_end - 1; | |
367e86e8 FB |
273 | if (p == p_start) |
274 | error("empty code for %s", name); | |
4b74fe1f FB |
275 | if (p[0] != 0xc3) |
276 | error("ret expected at the end of %s", name); | |
367e86e8 FB |
277 | copy_size = p - p_start; |
278 | } | |
279 | break; | |
280 | case EM_PPC: | |
281 | { | |
282 | uint8_t *p; | |
283 | p = (void *)(p_end - 4); | |
367e86e8 FB |
284 | if (p == p_start) |
285 | error("empty code for %s", name); | |
04369ff2 FB |
286 | if (get32((uint32_t *)p) != 0x4e800020) |
287 | error("blr expected at the end of %s", name); | |
367e86e8 FB |
288 | copy_size = p - p_start; |
289 | } | |
290 | break; | |
fb3e5849 FB |
291 | case EM_S390: |
292 | { | |
293 | uint8_t *p; | |
294 | p = (void *)(p_end - 2); | |
295 | if (p == p_start) | |
296 | error("empty code for %s", name); | |
297 | if (get16((uint16_t *)p) != 0x07fe && get16((uint16_t *)p) != 0x07f4) | |
298 | error("br %r14 expected at the end of %s", name); | |
299 | copy_size = p - p_start; | |
300 | } | |
301 | break; | |
367e86e8 FB |
302 | } |
303 | ||
304 | /* compute the number of arguments by looking at the relocations */ | |
305 | for(i = 0;i < MAX_ARGS; i++) | |
306 | args_present[i] = 0; | |
307 | ||
ce11fedc FB |
308 | for(i = 0, rel = relocs;i < nb_relocs; i++, rel++) { |
309 | if (rel->r_offset >= offset && rel->r_offset < offset + copy_size) { | |
310 | sym_name = strtab + symtab[ELFW(R_SYM)(rel->r_info)].st_name; | |
311 | if (strstart(sym_name, "__op_param", &p)) { | |
312 | n = strtoul(p, NULL, 10); | |
313 | if (n >= MAX_ARGS) | |
314 | error("too many arguments in %s", name); | |
315 | args_present[n - 1] = 1; | |
367e86e8 FB |
316 | } |
317 | } | |
318 | } | |
319 | ||
320 | nb_args = 0; | |
321 | while (nb_args < MAX_ARGS && args_present[nb_args]) | |
322 | nb_args++; | |
323 | for(i = nb_args; i < MAX_ARGS; i++) { | |
324 | if (args_present[i]) | |
325 | error("inconsistent argument numbering in %s", name); | |
326 | } | |
327 | ||
0ea00c9a FB |
328 | if (gen_switch == 2) { |
329 | fprintf(outfile, "DEF(%s, %d)\n", name + 3, nb_args); | |
330 | } else if (gen_switch == 1) { | |
dc99065b FB |
331 | |
332 | /* output C code */ | |
333 | fprintf(outfile, "case INDEX_%s: {\n", name); | |
334 | if (nb_args > 0) { | |
335 | fprintf(outfile, " long "); | |
336 | for(i = 0; i < nb_args; i++) { | |
337 | if (i != 0) | |
338 | fprintf(outfile, ", "); | |
339 | fprintf(outfile, "param%d", i + 1); | |
340 | } | |
341 | fprintf(outfile, ";\n"); | |
367e86e8 | 342 | } |
dc99065b FB |
343 | fprintf(outfile, " extern void %s();\n", name); |
344 | ||
ce11fedc FB |
345 | for(i = 0, rel = relocs;i < nb_relocs; i++, rel++) { |
346 | if (rel->r_offset >= offset && rel->r_offset < offset + copy_size) { | |
347 | sym_name = strtab + symtab[ELF32_R_SYM(rel->r_info)].st_name; | |
348 | if (!strstart(sym_name, "__op_param", &p)) { | |
349 | fprintf(outfile, "extern char %s;\n", sym_name); | |
dc99065b FB |
350 | } |
351 | } | |
352 | } | |
353 | ||
354 | fprintf(outfile, " memcpy(gen_code_ptr, &%s, %d);\n", name, copy_size); | |
355 | for(i = 0; i < nb_args; i++) { | |
356 | fprintf(outfile, " param%d = *opparam_ptr++;\n", i + 1); | |
357 | } | |
358 | ||
359 | /* patch relocations */ | |
ce11fedc | 360 | #if defined(HOST_I386) |
dc99065b | 361 | { |
dc99065b FB |
362 | char name[256]; |
363 | int type; | |
ce11fedc | 364 | int addend; |
dc99065b | 365 | for(i = 0, rel = relocs;i < nb_relocs; i++, rel++) { |
367e86e8 FB |
366 | if (rel->r_offset >= offset && rel->r_offset < offset + copy_size) { |
367 | sym_name = strtab + symtab[ELF32_R_SYM(rel->r_info)].st_name; | |
368 | if (strstart(sym_name, "__op_param", &p)) { | |
369 | snprintf(name, sizeof(name), "param%s", p); | |
370 | } else { | |
371 | snprintf(name, sizeof(name), "(long)(&%s)", sym_name); | |
372 | } | |
373 | type = ELF32_R_TYPE(rel->r_info); | |
374 | addend = get32((uint32_t *)(text + rel->r_offset)); | |
375 | switch(type) { | |
376 | case R_386_32: | |
ce11fedc | 377 | fprintf(outfile, " *(uint32_t *)(gen_code_ptr + %d) = %s + %d;\n", |
367e86e8 FB |
378 | rel->r_offset - offset, name, addend); |
379 | break; | |
380 | case R_386_PC32: | |
ce11fedc | 381 | fprintf(outfile, " *(uint32_t *)(gen_code_ptr + %d) = %s - (long)(gen_code_ptr + %d) + %d;\n", |
367e86e8 FB |
382 | rel->r_offset - offset, name, rel->r_offset - offset, addend); |
383 | break; | |
384 | default: | |
385 | error("unsupported i386 relocation (%d)", type); | |
386 | } | |
387 | } | |
dc99065b FB |
388 | } |
389 | } | |
ce11fedc | 390 | #elif defined(HOST_PPC) |
04369ff2 | 391 | { |
04369ff2 FB |
392 | char name[256]; |
393 | int type; | |
ce11fedc | 394 | int addend; |
04369ff2 FB |
395 | for(i = 0, rel = relocs;i < nb_relocs; i++, rel++) { |
396 | if (rel->r_offset >= offset && rel->r_offset < offset + copy_size) { | |
397 | sym_name = strtab + symtab[ELF32_R_SYM(rel->r_info)].st_name; | |
398 | if (strstart(sym_name, "__op_param", &p)) { | |
399 | snprintf(name, sizeof(name), "param%s", p); | |
400 | } else { | |
401 | snprintf(name, sizeof(name), "(long)(&%s)", sym_name); | |
402 | } | |
403 | type = ELF32_R_TYPE(rel->r_info); | |
404 | addend = rel->r_addend; | |
405 | switch(type) { | |
406 | case R_PPC_ADDR32: | |
ce11fedc | 407 | fprintf(outfile, " *(uint32_t *)(gen_code_ptr + %d) = %s + %d;\n", |
04369ff2 FB |
408 | rel->r_offset - offset, name, addend); |
409 | break; | |
410 | case R_PPC_ADDR16_LO: | |
ce11fedc | 411 | fprintf(outfile, " *(uint16_t *)(gen_code_ptr + %d) = (%s + %d);\n", |
04369ff2 FB |
412 | rel->r_offset - offset, name, addend); |
413 | break; | |
414 | case R_PPC_ADDR16_HI: | |
ce11fedc | 415 | fprintf(outfile, " *(uint16_t *)(gen_code_ptr + %d) = (%s + %d) >> 16;\n", |
04369ff2 FB |
416 | rel->r_offset - offset, name, addend); |
417 | break; | |
418 | case R_PPC_ADDR16_HA: | |
ce11fedc | 419 | fprintf(outfile, " *(uint16_t *)(gen_code_ptr + %d) = (%s + %d + 0x8000) >> 16;\n", |
04369ff2 FB |
420 | rel->r_offset - offset, name, addend); |
421 | break; | |
422 | case R_PPC_REL24: | |
423 | /* warning: must be at 32 MB distancy */ | |
ce11fedc | 424 | fprintf(outfile, " *(uint32_t *)(gen_code_ptr + %d) = (*(uint32_t *)(gen_code_ptr + %d) & ~0x03fffffc) | ((%s - (long)(gen_code_ptr + %d) + %d) & 0x03fffffc);\n", |
04369ff2 FB |
425 | rel->r_offset - offset, rel->r_offset - offset, name, rel->r_offset - offset, addend); |
426 | break; | |
427 | default: | |
428 | error("unsupported powerpc relocation (%d)", type); | |
429 | } | |
430 | } | |
431 | } | |
432 | } | |
ce11fedc | 433 | #elif defined(HOST_S390) |
fb3e5849 | 434 | { |
fb3e5849 FB |
435 | char name[256]; |
436 | int type; | |
ce11fedc | 437 | int addend; |
fb3e5849 FB |
438 | for(i = 0, rel = relocs;i < nb_relocs; i++, rel++) { |
439 | if (rel->r_offset >= offset && rel->r_offset < offset + copy_size) { | |
440 | sym_name = strtab + symtab[ELF32_R_SYM(rel->r_info)].st_name; | |
441 | if (strstart(sym_name, "__op_param", &p)) { | |
442 | snprintf(name, sizeof(name), "param%s", p); | |
443 | } else { | |
444 | snprintf(name, sizeof(name), "(long)(&%s)", sym_name); | |
445 | } | |
446 | type = ELF32_R_TYPE(rel->r_info); | |
447 | addend = rel->r_addend; | |
448 | switch(type) { | |
449 | case R_390_32: | |
ce11fedc | 450 | fprintf(outfile, " *(uint32_t *)(gen_code_ptr + %d) = %s + %d;\n", |
fb3e5849 FB |
451 | rel->r_offset - offset, name, addend); |
452 | break; | |
453 | case R_390_16: | |
ce11fedc | 454 | fprintf(outfile, " *(uint16_t *)(gen_code_ptr + %d) = %s + %d;\n", |
fb3e5849 FB |
455 | rel->r_offset - offset, name, addend); |
456 | break; | |
457 | case R_390_8: | |
ce11fedc | 458 | fprintf(outfile, " *(uint8_t *)(gen_code_ptr + %d) = %s + %d;\n", |
fb3e5849 FB |
459 | rel->r_offset - offset, name, addend); |
460 | break; | |
461 | default: | |
462 | error("unsupported s390 relocation (%d)", type); | |
463 | } | |
464 | } | |
465 | } | |
466 | } | |
ce11fedc FB |
467 | #else |
468 | #error unsupported CPU | |
469 | #endif | |
dc99065b FB |
470 | fprintf(outfile, " gen_code_ptr += %d;\n", copy_size); |
471 | fprintf(outfile, "}\n"); | |
472 | fprintf(outfile, "break;\n\n"); | |
473 | } else { | |
474 | fprintf(outfile, "static inline void gen_%s(", name); | |
475 | if (nb_args == 0) { | |
476 | fprintf(outfile, "void"); | |
477 | } else { | |
478 | for(i = 0; i < nb_args; i++) { | |
479 | if (i != 0) | |
480 | fprintf(outfile, ", "); | |
481 | fprintf(outfile, "long param%d", i + 1); | |
367e86e8 FB |
482 | } |
483 | } | |
dc99065b FB |
484 | fprintf(outfile, ")\n"); |
485 | fprintf(outfile, "{\n"); | |
486 | for(i = 0; i < nb_args; i++) { | |
487 | fprintf(outfile, " *gen_opparam_ptr++ = param%d;\n", i + 1); | |
488 | } | |
489 | fprintf(outfile, " *gen_opc_ptr++ = INDEX_%s;\n", name); | |
490 | fprintf(outfile, "}\n\n"); | |
367e86e8 | 491 | } |
367e86e8 FB |
492 | } |
493 | ||
494 | /* load an elf object file */ | |
dc99065b | 495 | int load_elf(const char *filename, FILE *outfile, int do_print_enum) |
367e86e8 FB |
496 | { |
497 | int fd; | |
ce11fedc FB |
498 | struct elfhdr ehdr; |
499 | struct elf_shdr *sec, *shdr, *symtab_sec, *strtab_sec, *text_sec; | |
367e86e8 | 500 | int i, j, nb_syms; |
ce11fedc | 501 | ElfW(Sym) *symtab, *sym; |
367e86e8 FB |
502 | char *shstr, *strtab; |
503 | uint8_t *text; | |
504 | void *relocs; | |
505 | int nb_relocs, reloc_sh_type; | |
506 | ||
507 | fd = open(filename, O_RDONLY); | |
508 | if (fd < 0) | |
509 | error("can't open file '%s'", filename); | |
510 | ||
511 | /* Read ELF header. */ | |
512 | if (read(fd, &ehdr, sizeof (ehdr)) != sizeof (ehdr)) | |
513 | error("unable to read file header"); | |
514 | ||
515 | /* Check ELF identification. */ | |
516 | if (ehdr.e_ident[EI_MAG0] != ELFMAG0 | |
517 | || ehdr.e_ident[EI_MAG1] != ELFMAG1 | |
518 | || ehdr.e_ident[EI_MAG2] != ELFMAG2 | |
519 | || ehdr.e_ident[EI_MAG3] != ELFMAG3 | |
367e86e8 FB |
520 | || ehdr.e_ident[EI_VERSION] != EV_CURRENT) { |
521 | error("bad ELF header"); | |
522 | } | |
523 | ||
524 | do_swap = elf_must_swap(&ehdr); | |
525 | if (do_swap) | |
526 | elf_swap_ehdr(&ehdr); | |
ce11fedc FB |
527 | if (ehdr.e_ident[EI_CLASS] != ELF_CLASS) |
528 | error("Unsupported ELF class"); | |
367e86e8 FB |
529 | if (ehdr.e_type != ET_REL) |
530 | error("ELF object file expected"); | |
531 | if (ehdr.e_version != EV_CURRENT) | |
532 | error("Invalid ELF version"); | |
ce11fedc FB |
533 | if (!elf_check_arch(ehdr.e_machine)) |
534 | error("Unsupported CPU (e_machine=%d)", ehdr.e_machine); | |
367e86e8 FB |
535 | |
536 | /* read section headers */ | |
ce11fedc | 537 | shdr = load_data(fd, ehdr.e_shoff, ehdr.e_shnum * sizeof(struct elf_shdr)); |
367e86e8 FB |
538 | if (do_swap) { |
539 | for(i = 0; i < ehdr.e_shnum; i++) { | |
540 | elf_swap_shdr(&shdr[i]); | |
541 | } | |
542 | } | |
543 | ||
544 | sec = &shdr[ehdr.e_shstrndx]; | |
545 | shstr = load_data(fd, sec->sh_offset, sec->sh_size); | |
546 | ||
547 | /* text section */ | |
548 | ||
549 | text_sec = find_elf_section(shdr, ehdr.e_shnum, shstr, ".text"); | |
550 | if (!text_sec) | |
551 | error("could not find .text section"); | |
552 | text = load_data(fd, text_sec->sh_offset, text_sec->sh_size); | |
553 | ||
554 | /* find text relocations, if any */ | |
555 | nb_relocs = 0; | |
556 | relocs = NULL; | |
557 | reloc_sh_type = 0; | |
558 | for(i = 0; i < ehdr.e_shnum; i++) { | |
559 | sec = &shdr[i]; | |
560 | if ((sec->sh_type == SHT_REL || sec->sh_type == SHT_RELA) && | |
561 | sec->sh_info == (text_sec - shdr)) { | |
562 | reloc_sh_type = sec->sh_type; | |
563 | relocs = load_data(fd, sec->sh_offset, sec->sh_size); | |
564 | nb_relocs = sec->sh_size / sec->sh_entsize; | |
565 | if (do_swap) { | |
566 | if (sec->sh_type == SHT_REL) { | |
567 | Elf32_Rel *rel = relocs; | |
568 | for(j = 0, rel = relocs; j < nb_relocs; j++, rel++) { | |
569 | swab32s(&rel->r_offset); | |
570 | swab32s(&rel->r_info); | |
571 | } | |
572 | } else { | |
573 | Elf32_Rela *rel = relocs; | |
574 | for(j = 0, rel = relocs; j < nb_relocs; j++, rel++) { | |
575 | swab32s(&rel->r_offset); | |
576 | swab32s(&rel->r_info); | |
577 | swab32s(&rel->r_addend); | |
578 | } | |
579 | } | |
580 | } | |
581 | break; | |
582 | } | |
583 | } | |
584 | ||
585 | symtab_sec = find_elf_section(shdr, ehdr.e_shnum, shstr, ".symtab"); | |
586 | if (!symtab_sec) | |
587 | error("could not find .symtab section"); | |
588 | strtab_sec = &shdr[symtab_sec->sh_link]; | |
589 | ||
590 | symtab = load_data(fd, symtab_sec->sh_offset, symtab_sec->sh_size); | |
591 | strtab = load_data(fd, strtab_sec->sh_offset, strtab_sec->sh_size); | |
592 | ||
593 | nb_syms = symtab_sec->sh_size / sizeof(Elf32_Sym); | |
594 | if (do_swap) { | |
595 | for(i = 0, sym = symtab; i < nb_syms; i++, sym++) { | |
596 | swab32s(&sym->st_name); | |
ce11fedc FB |
597 | swabls(&sym->st_value); |
598 | swabls(&sym->st_size); | |
367e86e8 FB |
599 | swab16s(&sym->st_shndx); |
600 | } | |
601 | } | |
602 | ||
dc99065b | 603 | if (do_print_enum) { |
0ea00c9a | 604 | fprintf(outfile, "DEF(end, 0)\n"); |
dc99065b FB |
605 | for(i = 0, sym = symtab; i < nb_syms; i++, sym++) { |
606 | const char *name, *p; | |
607 | name = strtab + sym->st_name; | |
608 | if (strstart(name, OP_PREFIX, &p)) { | |
0ea00c9a FB |
609 | gen_code(name, sym->st_value, sym->st_size, outfile, |
610 | text, relocs, nb_relocs, reloc_sh_type, symtab, strtab, 2); | |
dc99065b FB |
611 | } |
612 | } | |
613 | } else { | |
614 | /* generate big code generation switch */ | |
615 | fprintf(outfile, | |
616 | "int dyngen_code(uint8_t *gen_code_buf,\n" | |
617 | " const uint16_t *opc_buf, const uint32_t *opparam_buf)\n" | |
618 | "{\n" | |
619 | " uint8_t *gen_code_ptr;\n" | |
620 | " const uint16_t *opc_ptr;\n" | |
621 | " const uint32_t *opparam_ptr;\n" | |
622 | " gen_code_ptr = gen_code_buf;\n" | |
623 | " opc_ptr = opc_buf;\n" | |
624 | " opparam_ptr = opparam_buf;\n" | |
625 | " for(;;) {\n" | |
626 | " switch(*opc_ptr++) {\n" | |
627 | ); | |
367e86e8 | 628 | |
dc99065b FB |
629 | for(i = 0, sym = symtab; i < nb_syms; i++, sym++) { |
630 | const char *name; | |
631 | name = strtab + sym->st_name; | |
632 | if (strstart(name, OP_PREFIX, NULL)) { | |
367e86e8 | 633 | #if 0 |
dc99065b FB |
634 | printf("%4d: %s pos=0x%08x len=%d\n", |
635 | i, name, sym->st_value, sym->st_size); | |
367e86e8 | 636 | #endif |
dc99065b FB |
637 | if (sym->st_shndx != (text_sec - shdr)) |
638 | error("invalid section for opcode (0x%x)", sym->st_shndx); | |
639 | gen_code(name, sym->st_value, sym->st_size, outfile, | |
640 | text, relocs, nb_relocs, reloc_sh_type, symtab, strtab, 1); | |
641 | } | |
642 | } | |
643 | ||
644 | fprintf(outfile, | |
645 | " default:\n" | |
646 | " goto the_end;\n" | |
647 | " }\n" | |
648 | " }\n" | |
649 | " the_end:\n" | |
650 | ); | |
651 | ||
652 | /* generate a return */ | |
ce11fedc | 653 | switch(ELF_ARCH) { |
dc99065b FB |
654 | case EM_386: |
655 | fprintf(outfile, "*gen_code_ptr++ = 0xc3; /* ret */\n"); | |
656 | break; | |
04369ff2 FB |
657 | case EM_PPC: |
658 | fprintf(outfile, "*((uint32_t *)gen_code_ptr)++ = 0x4e800020; /* blr */\n"); | |
659 | break; | |
fb3e5849 FB |
660 | case EM_S390: |
661 | fprintf(outfile, "*((uint16_t *)gen_code_ptr)++ = 0x07fe; /* br %%r14 */\n"); | |
662 | break; | |
dc99065b FB |
663 | } |
664 | ||
665 | fprintf(outfile, "return gen_code_ptr - gen_code_buf;\n"); | |
666 | fprintf(outfile, "}\n\n"); | |
667 | ||
668 | /* generate gen_xxx functions */ | |
669 | /* XXX: suppress the use of these functions to simplify code */ | |
670 | for(i = 0, sym = symtab; i < nb_syms; i++, sym++) { | |
671 | const char *name; | |
672 | name = strtab + sym->st_name; | |
673 | if (strstart(name, OP_PREFIX, NULL)) { | |
674 | if (sym->st_shndx != (text_sec - shdr)) | |
675 | error("invalid section for opcode (0x%x)", sym->st_shndx); | |
676 | gen_code(name, sym->st_value, sym->st_size, outfile, | |
677 | text, relocs, nb_relocs, reloc_sh_type, symtab, strtab, 0); | |
678 | } | |
367e86e8 FB |
679 | } |
680 | } | |
681 | ||
682 | close(fd); | |
683 | return 0; | |
684 | } | |
685 | ||
686 | void usage(void) | |
687 | { | |
688 | printf("dyngen (c) 2003 Fabrice Bellard\n" | |
dc99065b FB |
689 | "usage: dyngen [-o outfile] [-c] objfile\n" |
690 | "Generate a dynamic code generator from an object file\n" | |
691 | "-c output enum of operations\n" | |
692 | ); | |
367e86e8 FB |
693 | exit(1); |
694 | } | |
695 | ||
696 | int main(int argc, char **argv) | |
697 | { | |
dc99065b | 698 | int c, do_print_enum; |
367e86e8 FB |
699 | const char *filename, *outfilename; |
700 | FILE *outfile; | |
701 | ||
702 | outfilename = "out.c"; | |
dc99065b | 703 | do_print_enum = 0; |
367e86e8 | 704 | for(;;) { |
dc99065b | 705 | c = getopt(argc, argv, "ho:c"); |
367e86e8 FB |
706 | if (c == -1) |
707 | break; | |
708 | switch(c) { | |
709 | case 'h': | |
710 | usage(); | |
711 | break; | |
712 | case 'o': | |
713 | outfilename = optarg; | |
714 | break; | |
dc99065b FB |
715 | case 'c': |
716 | do_print_enum = 1; | |
717 | break; | |
367e86e8 FB |
718 | } |
719 | } | |
720 | if (optind >= argc) | |
721 | usage(); | |
722 | filename = argv[optind]; | |
723 | outfile = fopen(outfilename, "w"); | |
724 | if (!outfile) | |
725 | error("could not open '%s'", outfilename); | |
dc99065b | 726 | load_elf(filename, outfile, do_print_enum); |
367e86e8 FB |
727 | fclose(outfile); |
728 | return 0; | |
729 | } |