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fixed small page handling
[qemu.git] / dyngen.c
CommitLineData
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
efdea7bf
FB		 61#elif defined(HOST_IA64)
62
63#define ELF_CLASS ELFCLASS64
64#define ELF_ARCH EM_IA_64
65#define elf_check_arch(x) ((x) == EM_IA_64)
66#define ELF_USES_RELOCA
67
d014c98c
FB		 68#elif defined(HOST_SPARC)
69
70#define ELF_CLASS ELFCLASS32
71#define ELF_ARCH EM_SPARC
72#define elf_check_arch(x) ((x) == EM_SPARC || (x) == EM_SPARC32PLUS)
73#define ELF_USES_RELOCA
74
75#elif defined(HOST_SPARC64)
76
77#define ELF_CLASS ELFCLASS64
78#define ELF_ARCH EM_SPARCV9
79#define elf_check_arch(x) ((x) == EM_SPARCV9)
80#define ELF_USES_RELOCA
81
ce11fedc
FB		 82#else
83#error unsupported CPU - please update the code
84#endif
85
efdea7bf
FB		 86#include "elf.h"
87
ce11fedc
FB		 88#if ELF_CLASS == ELFCLASS32
89typedef int32_t host_long;
90typedef uint32_t host_ulong;
efdea7bf 91#define swabls(x) swab32s(x)
ce11fedc
FB		 92#else
93typedef int64_t host_long;
94typedef uint64_t host_ulong;
efdea7bf 95#define swabls(x) swab64s(x)
fb3e5849
FB		 96#endif
97
ce11fedc
FB		 98#include "thunk.h"
99
367e86e8 100/* all dynamically generated functions begin with this code */
dc99065b 101#define OP_PREFIX "op_"
367e86e8 102
ce11fedc 103int elf_must_swap(struct elfhdr *h)
367e86e8
FB		 104{
105 union {
106 uint32_t i;
107 uint8_t b[4];
108 } swaptest;
109
110 swaptest.i = 1;
111 return (h->e_ident[EI_DATA] == ELFDATA2MSB) !=
112 (swaptest.b[0] == 0);
113}
114
115void swab16s(uint16_t *p)
116{
117 *p = bswap16(*p);
118}
119
120void swab32s(uint32_t *p)
121{
122 *p = bswap32(*p);
123}
124
ce11fedc 125void swab64s(uint64_t *p)
367e86e8
FB		 126{
127 *p = bswap64(*p);
128}
129
ce11fedc 130void elf_swap_ehdr(struct elfhdr *h)
367e86e8
FB		 131{
132 swab16s(&h->e_type); /* Object file type */
133 swab16s(&h-> e_machine); /* Architecture */
134 swab32s(&h-> e_version); /* Object file version */
ce11fedc
FB		 135 swabls(&h-> e_entry); /* Entry point virtual address */
136 swabls(&h-> e_phoff); /* Program header table file offset */
137 swabls(&h-> e_shoff); /* Section header table file offset */
367e86e8
FB		 138 swab32s(&h-> e_flags); /* Processor-specific flags */
139 swab16s(&h-> e_ehsize); /* ELF header size in bytes */
140 swab16s(&h-> e_phentsize); /* Program header table entry size */
141 swab16s(&h-> e_phnum); /* Program header table entry count */
142 swab16s(&h-> e_shentsize); /* Section header table entry size */
143 swab16s(&h-> e_shnum); /* Section header table entry count */
144 swab16s(&h-> e_shstrndx); /* Section header string table index */
145}
146
ce11fedc 147void elf_swap_shdr(struct elf_shdr *h)
367e86e8
FB		 148{
149 swab32s(&h-> sh_name); /* Section name (string tbl index) */
150 swab32s(&h-> sh_type); /* Section type */
ce11fedc
FB		 151 swabls(&h-> sh_flags); /* Section flags */
152 swabls(&h-> sh_addr); /* Section virtual addr at execution */
153 swabls(&h-> sh_offset); /* Section file offset */
154 swabls(&h-> sh_size); /* Section size in bytes */
367e86e8
FB		 155 swab32s(&h-> sh_link); /* Link to another section */
156 swab32s(&h-> sh_info); /* Additional section information */
ce11fedc
FB		 157 swabls(&h-> sh_addralign); /* Section alignment */
158 swabls(&h-> sh_entsize); /* Entry size if section holds table */
367e86e8
FB		 159}
160
ce11fedc 161void elf_swap_phdr(struct elf_phdr *h)
367e86e8
FB		 162{
163 swab32s(&h->p_type); /* Segment type */
ce11fedc
FB		 164 swabls(&h->p_offset); /* Segment file offset */
165 swabls(&h->p_vaddr); /* Segment virtual address */
166 swabls(&h->p_paddr); /* Segment physical address */
167 swabls(&h->p_filesz); /* Segment size in file */
168 swabls(&h->p_memsz); /* Segment size in memory */
367e86e8 169 swab32s(&h->p_flags); /* Segment flags */
ce11fedc 170 swabls(&h->p_align); /* Segment alignment */
367e86e8
FB		 171}
172
173int do_swap;
367e86e8
FB		 174
175uint16_t get16(uint16_t *p)
176{
177 uint16_t val;
178 val = *p;
179 if (do_swap)
180 val = bswap16(val);
181 return val;
182}
183
184uint32_t get32(uint32_t *p)
185{
186 uint32_t val;
187 val = *p;
188 if (do_swap)
189 val = bswap32(val);
190 return val;
191}
192
193void put16(uint16_t *p, uint16_t val)
194{
195 if (do_swap)
196 val = bswap16(val);
197 *p = val;
198}
199
200void put32(uint32_t *p, uint32_t val)
201{
202 if (do_swap)
203 val = bswap32(val);
204 *p = val;
205}
206
efdea7bf 207void __attribute__((noreturn)) __attribute__((format (printf, 1, 2))) error(const char *fmt, ...)
367e86e8
FB		 208{
209 va_list ap;
210 va_start(ap, fmt);
211 fprintf(stderr, "dyngen: ");
212 vfprintf(stderr, fmt, ap);
213 fprintf(stderr, "\n");
214 va_end(ap);
215 exit(1);
216}
217
218
ce11fedc
FB		 219struct elf_shdr *find_elf_section(struct elf_shdr *shdr, int shnum, const char *shstr,
220 const char *name)
367e86e8
FB		 221{
222 int i;
223 const char *shname;
ce11fedc 224 struct elf_shdr *sec;
367e86e8
FB		 225
226 for(i = 0; i < shnum; i++) {
227 sec = &shdr[i];
228 if (!sec->sh_name)
229 continue;
230 shname = shstr + sec->sh_name;
231 if (!strcmp(shname, name))
232 return sec;
233 }
234 return NULL;
235}
236
237void *load_data(int fd, long offset, unsigned int size)
238{
239 char *data;
240
241 data = malloc(size);
242 if (!data)
243 return NULL;
244 lseek(fd, offset, SEEK_SET);
245 if (read(fd, data, size) != size) {
246 free(data);
247 return NULL;
248 }
249 return data;
250}
251
252int strstart(const char *str, const char *val, const char **ptr)
253{
254 const char *p, *q;
255 p = str;
256 q = val;
257 while (*q != '\0') {
258 if (*p != *q)
259 return 0;
260 p++;
261 q++;
262 }
263 if (ptr)
264 *ptr = p;
265 return 1;
266}
267
268#define MAX_ARGS 3
269
270/* generate op code */
ce11fedc
FB		 271void gen_code(const char *name, host_ulong offset, host_ulong size,
272 FILE *outfile, uint8_t *text, ELF_RELOC *relocs, int nb_relocs, int reloc_sh_type,
273 ElfW(Sym) *symtab, char *strtab, int gen_switch)
367e86e8
FB		 274{
275 int copy_size = 0;
276 uint8_t *p_start, *p_end;
ce11fedc 277 int nb_args, i, n;
367e86e8
FB		 278 uint8_t args_present[MAX_ARGS];
279 const char *sym_name, *p;
ce11fedc 280 ELF_RELOC *rel;
367e86e8
FB		 281
282 /* compute exact size excluding return instruction */
283 p_start = text + offset;
284 p_end = p_start + size;
ce11fedc 285 switch(ELF_ARCH) {
367e86e8
FB		 286 case EM_386:
287 {
288 uint8_t *p;
289 p = p_end - 1;
367e86e8
FB		 290 if (p == p_start)
291 error("empty code for %s", name);
4b74fe1f
FB		 292 if (p[0] != 0xc3)
293 error("ret expected at the end of %s", name);
367e86e8
FB		 294 copy_size = p - p_start;
295 }
296 break;
297 case EM_PPC:
298 {
299 uint8_t *p;
300 p = (void *)(p_end - 4);
367e86e8
FB		 301 if (p == p_start)
302 error("empty code for %s", name);
04369ff2
FB		 303 if (get32((uint32_t *)p) != 0x4e800020)
304 error("blr expected at the end of %s", name);
367e86e8
FB		 305 copy_size = p - p_start;
306 }
307 break;
fb3e5849
FB		 308 case EM_S390:
309 {
310 uint8_t *p;
311 p = (void *)(p_end - 2);
312 if (p == p_start)
313 error("empty code for %s", name);
314 if (get16((uint16_t *)p) != 0x07fe && get16((uint16_t *)p) != 0x07f4)
efdea7bf 315 error("br %%r14 expected at the end of %s", name);
fb3e5849
FB		 316 copy_size = p - p_start;
317 }
318 break;
efdea7bf
FB		 319 case EM_ALPHA:
320 {
321 uint8_t *p;
322 p = p_end - 4;
323 if (p == p_start)
324 error("empty code for %s", name);
325 if (get32((uint32_t *)p) != 0x6bfa8001)
326 error("ret expected at the end of %s", name);
327 copy_size = p - p_start;
328 }
329 break;
330 case EM_IA_64:
331 {
332 uint8_t *p;
333 p = (void *)(p_end - 4);
334 if (p == p_start)
335 error("empty code for %s", name);
336 /* br.ret.sptk.many b0;; */
337 /* 08 00 84 00 */
338 if (get32((uint32_t *)p) != 0x00840008)
339 error("br.ret.sptk.many b0;; expected at the end of %s", name);
340 copy_size = p - p_start;
341 }
342 break;
d014c98c
FB		 343 case EM_SPARC:
344 case EM_SPARC32PLUS:
345 {
346 uint8_t *p;
347 p = (void *)(p_end - 8);
348 if (p <= p_start)
349 error("empty code for %s", name);
350 if (get32((uint32_t *)(p_start + 0x0)) != 0x9de3bf98)
351 error("save %%sp,-104,%%sp expected at the start of %s "
352 "found [%08x]",
353 name, get32((uint32_t *)(p_start + 0x0)));
354 if (get32((uint32_t *)(p + 0x0)) != 0x81c7e008 ||
355 get32((uint32_t *)(p + 0x4)) != 0x81e80000)
356 error("ret; restore; expected at the end of %s found [%08x:%08x]",
357 name,
358 get32((uint32_t *)(p + 0x0)),
359 get32((uint32_t *)(p + 0x4)));
360
361 copy_size = p - p_start;
362 }
363 break;
364 case EM_SPARCV9:
365 {
366 uint8_t *p;
367 p = (void *)(p_end - 8);
368 if (p <= p_start)
369 error("empty code for %s", name);
370 if (get32((uint32_t *)(p_start + 0x0)) != 0x9de3bf40)
371 error("save %%sp,-192,%%sp expected at the start of %s "
372 "found [%08x]",
373 name, get32((uint32_t *)(p_start + 0x0)));
374 if (get32((uint32_t *)(p + 0x0)) != 0x81cfe008 ||
375 get32((uint32_t *)(p + 0x4)) != 0x01000000)
376 error("rett %%i7+8; nop; expected at the end of %s "
377 "found [%08x:%08x]",
378 name,
379 get32((uint32_t *)(p + 0x0)),
380 get32((uint32_t *)(p + 0x4)));
381 copy_size = p - p_start;
382 }
383 break;
efdea7bf
FB		 384 default:
385 error("unknown ELF architecture");
367e86e8
FB		 386 }
387
388 /* compute the number of arguments by looking at the relocations */
389 for(i = 0;i < MAX_ARGS; i++)
390 args_present[i] = 0;
391
ce11fedc
FB		 392 for(i = 0, rel = relocs;i < nb_relocs; i++, rel++) {
393 if (rel->r_offset >= offset && rel->r_offset < offset + copy_size) {
394 sym_name = strtab + symtab[ELFW(R_SYM)(rel->r_info)].st_name;
395 if (strstart(sym_name, "__op_param", &p)) {
396 n = strtoul(p, NULL, 10);
397 if (n >= MAX_ARGS)
398 error("too many arguments in %s", name);
399 args_present[n - 1] = 1;
367e86e8
FB		 400 }
401 }
402 }
403
404 nb_args = 0;
405 while (nb_args < MAX_ARGS && args_present[nb_args])
406 nb_args++;
407 for(i = nb_args; i < MAX_ARGS; i++) {
408 if (args_present[i])
409 error("inconsistent argument numbering in %s", name);
410 }
411
0ea00c9a
FB		 412 if (gen_switch == 2) {
413 fprintf(outfile, "DEF(%s, %d)\n", name + 3, nb_args);
414 } else if (gen_switch == 1) {
dc99065b
FB		 415
416 /* output C code */
417 fprintf(outfile, "case INDEX_%s: {\n", name);
418 if (nb_args > 0) {
419 fprintf(outfile, " long ");
420 for(i = 0; i < nb_args; i++) {
421 if (i != 0)
422 fprintf(outfile, ", ");
423 fprintf(outfile, "param%d", i + 1);
424 }
425 fprintf(outfile, ";\n");
367e86e8 426 }
dc99065b
FB		 427 fprintf(outfile, " extern void %s();\n", name);
428
ce11fedc
FB		 429 for(i = 0, rel = relocs;i < nb_relocs; i++, rel++) {
430 if (rel->r_offset >= offset && rel->r_offset < offset + copy_size) {
efdea7bf 431 sym_name = strtab + symtab[ELFW(R_SYM)(rel->r_info)].st_name;
74c95119 432 if (*sym_name && !strstart(sym_name, "__op_param", &p)) {
d014c98c
FB		 433#if defined(HOST_SPARC)
434 if (sym_name[0] == '.') {
435 fprintf(outfile,
436 "extern char __dot_%s __asm__(\"%s\");\n",
437 sym_name+1, sym_name);
438 continue;
439 }
440#endif
ce11fedc 441 fprintf(outfile, "extern char %s;\n", sym_name);
dc99065b
FB		 442 }
443 }
444 }
445
446 fprintf(outfile, " memcpy(gen_code_ptr, &%s, %d);\n", name, copy_size);
447 for(i = 0; i < nb_args; i++) {
448 fprintf(outfile, " param%d = *opparam_ptr++;\n", i + 1);
449 }
450
451 /* patch relocations */
ce11fedc 452#if defined(HOST_I386)
dc99065b 453 {
dc99065b
FB		 454 char name[256];
455 int type;
ce11fedc 456 int addend;
dc99065b 457 for(i = 0, rel = relocs;i < nb_relocs; i++, rel++) {
367e86e8 458 if (rel->r_offset >= offset && rel->r_offset < offset + copy_size) {
efdea7bf 459 sym_name = strtab + symtab[ELFW(R_SYM)(rel->r_info)].st_name;
367e86e8
FB		 460 if (strstart(sym_name, "__op_param", &p)) {
461 snprintf(name, sizeof(name), "param%s", p);
462 } else {
463 snprintf(name, sizeof(name), "(long)(&%s)", sym_name);
464 }
465 type = ELF32_R_TYPE(rel->r_info);
466 addend = get32((uint32_t *)(text + rel->r_offset));
467 switch(type) {
468 case R_386_32:
ce11fedc 469 fprintf(outfile, " *(uint32_t *)(gen_code_ptr + %d) = %s + %d;\n",
367e86e8
FB		 470 rel->r_offset - offset, name, addend);
471 break;
472 case R_386_PC32:
ce11fedc 473 fprintf(outfile, " *(uint32_t *)(gen_code_ptr + %d) = %s - (long)(gen_code_ptr + %d) + %d;\n",
367e86e8
FB		 474 rel->r_offset - offset, name, rel->r_offset - offset, addend);
475 break;
476 default:
477 error("unsupported i386 relocation (%d)", type);
478 }
479 }
dc99065b
FB		 480 }
481 }
ce11fedc 482#elif defined(HOST_PPC)
04369ff2 483 {
04369ff2
FB		 484 char name[256];
485 int type;
ce11fedc 486 int addend;
04369ff2
FB		 487 for(i = 0, rel = relocs;i < nb_relocs; i++, rel++) {
488 if (rel->r_offset >= offset && rel->r_offset < offset + copy_size) {
efdea7bf 489 sym_name = strtab + symtab[ELFW(R_SYM)(rel->r_info)].st_name;
04369ff2
FB		 490 if (strstart(sym_name, "__op_param", &p)) {
491 snprintf(name, sizeof(name), "param%s", p);
492 } else {
493 snprintf(name, sizeof(name), "(long)(&%s)", sym_name);
494 }
495 type = ELF32_R_TYPE(rel->r_info);
496 addend = rel->r_addend;
497 switch(type) {
498 case R_PPC_ADDR32:
ce11fedc 499 fprintf(outfile, " *(uint32_t *)(gen_code_ptr + %d) = %s + %d;\n",
04369ff2
FB		 500 rel->r_offset - offset, name, addend);
501 break;
502 case R_PPC_ADDR16_LO:
ce11fedc 503 fprintf(outfile, " *(uint16_t *)(gen_code_ptr + %d) = (%s + %d);\n",
04369ff2
FB		 504 rel->r_offset - offset, name, addend);
505 break;
506 case R_PPC_ADDR16_HI:
ce11fedc 507 fprintf(outfile, " *(uint16_t *)(gen_code_ptr + %d) = (%s + %d) >> 16;\n",
04369ff2
FB		 508 rel->r_offset - offset, name, addend);
509 break;
510 case R_PPC_ADDR16_HA:
ce11fedc 511 fprintf(outfile, " *(uint16_t *)(gen_code_ptr + %d) = (%s + %d + 0x8000) >> 16;\n",
04369ff2
FB		 512 rel->r_offset - offset, name, addend);
513 break;
514 case R_PPC_REL24:
515 /* warning: must be at 32 MB distancy */
ce11fedc 516 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		 517 rel->r_offset - offset, rel->r_offset - offset, name, rel->r_offset - offset, addend);
518 break;
519 default:
520 error("unsupported powerpc relocation (%d)", type);
521 }
522 }
523 }
524 }
ce11fedc 525#elif defined(HOST_S390)
fb3e5849 526 {
fb3e5849
FB		 527 char name[256];
528 int type;
ce11fedc 529 int addend;
fb3e5849
FB		 530 for(i = 0, rel = relocs;i < nb_relocs; i++, rel++) {
531 if (rel->r_offset >= offset && rel->r_offset < offset + copy_size) {
efdea7bf 532 sym_name = strtab + symtab[ELFW(R_SYM)(rel->r_info)].st_name;
fb3e5849
FB		 533 if (strstart(sym_name, "__op_param", &p)) {
534 snprintf(name, sizeof(name), "param%s", p);
535 } else {
536 snprintf(name, sizeof(name), "(long)(&%s)", sym_name);
537 }
538 type = ELF32_R_TYPE(rel->r_info);
539 addend = rel->r_addend;
540 switch(type) {
541 case R_390_32:
ce11fedc 542 fprintf(outfile, " *(uint32_t *)(gen_code_ptr + %d) = %s + %d;\n",
fb3e5849
FB		 543 rel->r_offset - offset, name, addend);
544 break;
545 case R_390_16:
ce11fedc 546 fprintf(outfile, " *(uint16_t *)(gen_code_ptr + %d) = %s + %d;\n",
fb3e5849
FB		 547 rel->r_offset - offset, name, addend);
548 break;
549 case R_390_8:
ce11fedc 550 fprintf(outfile, " *(uint8_t *)(gen_code_ptr + %d) = %s + %d;\n",
fb3e5849
FB		 551 rel->r_offset - offset, name, addend);
552 break;
553 default:
554 error("unsupported s390 relocation (%d)", type);
555 }
556 }
557 }
558 }
efdea7bf
FB		 559#elif defined(HOST_ALPHA)
560 {
561 for (i = 0, rel = relocs; i < nb_relocs; i++, rel++) {
562 if (rel->r_offset >= offset && rel->r_offset < offset + copy_size) {
563 int type;
74c95119 564
efdea7bf 565 type = ELF64_R_TYPE(rel->r_info);
74c95119 566 sym_name = strtab + symtab[ELF64_R_SYM(rel->r_info)].st_name;
efdea7bf
FB		 567 switch (type) {
568 case R_ALPHA_GPDISP:
74c95119
FB		 569 /* The gp is just 32 bit, and never changes, so it's easiest to emit it
570 as an immediate instead of constructing it from the pv or ra. */
571 fprintf(outfile, " immediate_ldah(gen_code_ptr + %ld, gp);\n",
efdea7bf 572 rel->r_offset - offset);
74c95119
FB		 573 fprintf(outfile, " immediate_lda(gen_code_ptr + %ld, gp);\n",
574 rel->r_offset - offset + rel->r_addend);
efdea7bf
FB		 575 break;
576 case R_ALPHA_LITUSE:
577 /* jsr to literal hint. Could be used to optimize to bsr. Ignore for
578 now, since some called functions (libc) need pv to be set up. */
579 break;
580 case R_ALPHA_HINT:
581 /* Branch target prediction hint. Ignore for now. Should be already
582 correct for in-function jumps. */
583 break;
584 case R_ALPHA_LITERAL:
74c95119
FB		 585 /* Load a literal from the GOT relative to the gp. Since there's only a
586 single gp, nothing is to be done. */
587 break;
588 case R_ALPHA_GPRELHIGH:
589 /* Handle fake relocations against __op_param symbol. Need to emit the
590 high part of the immediate value instead. Other symbols need no
591 special treatment. */
592 if (strstart(sym_name, "__op_param", &p))
593 fprintf(outfile, " immediate_ldah(gen_code_ptr + %ld, param%s);\n",
594 rel->r_offset - offset, p);
595 break;
596 case R_ALPHA_GPRELLOW:
597 if (strstart(sym_name, "__op_param", &p))
598 fprintf(outfile, " immediate_lda(gen_code_ptr + %ld, param%s);\n",
599 rel->r_offset - offset, p);
600 break;
601 case R_ALPHA_BRSGP:
602 /* PC-relative jump. Tweak offset to skip the two instructions that try to
603 set up the gp from the pv. */
604 fprintf(outfile, " fix_bsr(gen_code_ptr + %ld, (uint8_t *) &%s - (gen_code_ptr + %ld) + 4);\n",
605 rel->r_offset - offset, sym_name, rel->r_offset - offset);
efdea7bf
FB		 606 break;
607 default:
608 error("unsupported Alpha relocation (%d)", type);
609 }
610 }
611 }
612 }
613#elif defined(HOST_IA64)
614 {
615 char name[256];
616 int type;
617 int addend;
618 for(i = 0, rel = relocs;i < nb_relocs; i++, rel++) {
619 if (rel->r_offset >= offset && rel->r_offset < offset + copy_size) {
620 sym_name = strtab + symtab[ELF64_R_SYM(rel->r_info)].st_name;
621 if (strstart(sym_name, "__op_param", &p)) {
622 snprintf(name, sizeof(name), "param%s", p);
623 } else {
624 snprintf(name, sizeof(name), "(long)(&%s)", sym_name);
625 }
626 type = ELF64_R_TYPE(rel->r_info);
627 addend = rel->r_addend;
628 switch(type) {
629 case R_IA64_LTOFF22:
630 error("must implemnt R_IA64_LTOFF22 relocation");
631 case R_IA64_PCREL21B:
632 error("must implemnt R_IA64_PCREL21B relocation");
633 default:
634 error("unsupported ia64 relocation (%d)", type);
635 }
636 }
637 }
638 }
d014c98c
FB		 639#elif defined(HOST_SPARC)
640 {
641 char name[256];
642 int type;
643 int addend;
644 for(i = 0, rel = relocs;i < nb_relocs; i++, rel++) {
645 if (rel->r_offset >= offset && rel->r_offset < offset + copy_size) {
646 sym_name = strtab + symtab[ELF32_R_SYM(rel->r_info)].st_name;
647 if (strstart(sym_name, "__op_param", &p)) {
648 snprintf(name, sizeof(name), "param%s", p);
649 } else {
650 if (sym_name[0] == '.')
651 snprintf(name, sizeof(name),
652 "(long)(&__dot_%s)",
653 sym_name + 1);
654 else
655 snprintf(name, sizeof(name),
656 "(long)(&%s)", sym_name);
657 }
658 type = ELF32_R_TYPE(rel->r_info);
659 addend = rel->r_addend;
660 switch(type) {
661 case R_SPARC_32:
662 fprintf(outfile, " *(uint32_t *)(gen_code_ptr + %d) = %s + %d;\n",
663 rel->r_offset - offset, name, addend);
664 break;
665 case R_SPARC_HI22:
666 fprintf(outfile,
667 " *(uint32_t *)(gen_code_ptr + %d) = "
668 "((*(uint32_t *)(gen_code_ptr + %d)) "
669 " & ~0x3fffff) "
670 " | ((%s + %d) & 0x3fffff);\n",
671 rel->r_offset - offset,
672 rel->r_offset - offset,
673 name, addend);
674 break;
675 case R_SPARC_LO10:
676 fprintf(outfile,
677 " *(uint32_t *)(gen_code_ptr + %d) = "
678 "((*(uint32_t *)(gen_code_ptr + %d)) "
679 " & ~0x3ff) "
680 " | ((%s + %d) & 0x3ff);\n",
681 rel->r_offset - offset,
682 rel->r_offset - offset,
683 name, addend);
684 break;
685 case R_SPARC_WDISP30:
686 fprintf(outfile,
687 " *(uint32_t *)(gen_code_ptr + %d) = "
688 "((*(uint32_t *)(gen_code_ptr + %d)) "
689 " & ~0x3fffffff) "
690 " | ((((%s + %d) - (long)gen_code_ptr)>>2) "
691 " & 0x3fffffff);\n",
692 rel->r_offset - offset,
693 rel->r_offset - offset,
694 name, addend);
695 break;
696 default:
697 error("unsupported sparc relocation (%d)", type);
698 }
699 }
700 }
701 }
702#elif defined(HOST_SPARC64)
703 {
704 char name[256];
705 int type;
706 int addend;
707 for(i = 0, rel = relocs;i < nb_relocs; i++, rel++) {
708 if (rel->r_offset >= offset && rel->r_offset < offset + copy_size) {
709 sym_name = strtab + symtab[ELF64_R_SYM(rel->r_info)].st_name;
710 if (strstart(sym_name, "__op_param", &p)) {
711 snprintf(name, sizeof(name), "param%s", p);
712 } else {
713 snprintf(name, sizeof(name), "(long)(&%s)", sym_name);
714 }
715 type = ELF64_R_TYPE(rel->r_info);
716 addend = rel->r_addend;
717 switch(type) {
718 case R_SPARC_32:
719 fprintf(outfile, " *(uint32_t *)(gen_code_ptr + %d) = %s + %d;\n",
720 rel->r_offset - offset, name, addend);
721 break;
722 case R_SPARC_HI22:
723 fprintf(outfile,
724 " *(uint32_t *)(gen_code_ptr + %d) = "
725 "((*(uint32_t *)(gen_code_ptr + %d)) "
726 " & ~0x3fffff) "
727 " | ((%s + %d) & 0x3fffff);\n",
728 rel->r_offset - offset,
729 rel->r_offset - offset,
730 name, addend);
731 break;
732 case R_SPARC_LO10:
733 fprintf(outfile,
734 " *(uint32_t *)(gen_code_ptr + %d) = "
735 "((*(uint32_t *)(gen_code_ptr + %d)) "
736 " & ~0x3ff) "
737 " | ((%s + %d) & 0x3ff);\n",
738 rel->r_offset - offset,
739 rel->r_offset - offset,
740 name, addend);
741 break;
742 case R_SPARC_WDISP30:
743 fprintf(outfile,
744 " *(uint32_t *)(gen_code_ptr + %d) = "
745 "((*(uint32_t *)(gen_code_ptr + %d)) "
746 " & ~0x3fffffff) "
747 " | ((((%s + %d) - (long)gen_code_ptr)>>2) "
748 " & 0x3fffffff);\n",
749 rel->r_offset - offset,
750 rel->r_offset - offset,
751 name, addend);
752 break;
753 default:
754 error("unsupported sparc64 relocation (%d)", type);
755 }
756 }
757 }
758 }
ce11fedc
FB		 759#else
760#error unsupported CPU
761#endif
dc99065b
FB		 762 fprintf(outfile, " gen_code_ptr += %d;\n", copy_size);
763 fprintf(outfile, "}\n");
764 fprintf(outfile, "break;\n\n");
765 } else {
766 fprintf(outfile, "static inline void gen_%s(", name);
767 if (nb_args == 0) {
768 fprintf(outfile, "void");
769 } else {
770 for(i = 0; i < nb_args; i++) {
771 if (i != 0)
772 fprintf(outfile, ", ");
773 fprintf(outfile, "long param%d", i + 1);
367e86e8
FB		 774 }
775 }
dc99065b
FB		 776 fprintf(outfile, ")\n");
777 fprintf(outfile, "{\n");
778 for(i = 0; i < nb_args; i++) {
779 fprintf(outfile, " *gen_opparam_ptr++ = param%d;\n", i + 1);
780 }
781 fprintf(outfile, " *gen_opc_ptr++ = INDEX_%s;\n", name);
782 fprintf(outfile, "}\n\n");
367e86e8 783 }
367e86e8
FB		 784}
785
786/* load an elf object file */
dc99065b 787int load_elf(const char *filename, FILE *outfile, int do_print_enum)
367e86e8
FB		 788{
789 int fd;
ce11fedc
FB		 790 struct elfhdr ehdr;
791 struct elf_shdr *sec, *shdr, *symtab_sec, *strtab_sec, *text_sec;
367e86e8 792 int i, j, nb_syms;
ce11fedc 793 ElfW(Sym) *symtab, *sym;
367e86e8
FB		 794 char *shstr, *strtab;
795 uint8_t *text;
796 void *relocs;
797 int nb_relocs, reloc_sh_type;
798
799 fd = open(filename, O_RDONLY);
800 if (fd < 0)
801 error("can't open file '%s'", filename);
802
803 /* Read ELF header. */
804 if (read(fd, &ehdr, sizeof (ehdr)) != sizeof (ehdr))
805 error("unable to read file header");
806
807 /* Check ELF identification. */
808 if (ehdr.e_ident[EI_MAG0] != ELFMAG0
809 || ehdr.e_ident[EI_MAG1] != ELFMAG1
810 || ehdr.e_ident[EI_MAG2] != ELFMAG2
811 || ehdr.e_ident[EI_MAG3] != ELFMAG3
367e86e8
FB		 812 || ehdr.e_ident[EI_VERSION] != EV_CURRENT) {
813 error("bad ELF header");
814 }
815
816 do_swap = elf_must_swap(&ehdr);
817 if (do_swap)
818 elf_swap_ehdr(&ehdr);
ce11fedc
FB		 819 if (ehdr.e_ident[EI_CLASS] != ELF_CLASS)
820 error("Unsupported ELF class");
367e86e8
FB		 821 if (ehdr.e_type != ET_REL)
822 error("ELF object file expected");
823 if (ehdr.e_version != EV_CURRENT)
824 error("Invalid ELF version");
ce11fedc
FB		 825 if (!elf_check_arch(ehdr.e_machine))
826 error("Unsupported CPU (e_machine=%d)", ehdr.e_machine);
367e86e8
FB		 827
828 /* read section headers */
ce11fedc 829 shdr = load_data(fd, ehdr.e_shoff, ehdr.e_shnum * sizeof(struct elf_shdr));
367e86e8
FB		 830 if (do_swap) {
831 for(i = 0; i < ehdr.e_shnum; i++) {
832 elf_swap_shdr(&shdr[i]);
833 }
834 }
835
836 sec = &shdr[ehdr.e_shstrndx];
837 shstr = load_data(fd, sec->sh_offset, sec->sh_size);
838
839 /* text section */
840
841 text_sec = find_elf_section(shdr, ehdr.e_shnum, shstr, ".text");
842 if (!text_sec)
843 error("could not find .text section");
844 text = load_data(fd, text_sec->sh_offset, text_sec->sh_size);
845
846 /* find text relocations, if any */
847 nb_relocs = 0;
848 relocs = NULL;
849 reloc_sh_type = 0;
850 for(i = 0; i < ehdr.e_shnum; i++) {
851 sec = &shdr[i];
852 if ((sec->sh_type == SHT_REL || sec->sh_type == SHT_RELA) &&
853 sec->sh_info == (text_sec - shdr)) {
854 reloc_sh_type = sec->sh_type;
855 relocs = load_data(fd, sec->sh_offset, sec->sh_size);
856 nb_relocs = sec->sh_size / sec->sh_entsize;
857 if (do_swap) {
858 if (sec->sh_type == SHT_REL) {
efdea7bf 859 ElfW(Rel) *rel = relocs;
367e86e8 860 for(j = 0, rel = relocs; j < nb_relocs; j++, rel++) {
efdea7bf
FB		 861 swabls(&rel->r_offset);
862 swabls(&rel->r_info);
367e86e8
FB		 863 }
864 } else {
efdea7bf 865 ElfW(Rela) *rel = relocs;
367e86e8 866 for(j = 0, rel = relocs; j < nb_relocs; j++, rel++) {
efdea7bf
FB		 867 swabls(&rel->r_offset);
868 swabls(&rel->r_info);
869 swabls(&rel->r_addend);
367e86e8
FB		 870 }
871 }
872 }
873 break;
874 }
875 }
876
877 symtab_sec = find_elf_section(shdr, ehdr.e_shnum, shstr, ".symtab");
878 if (!symtab_sec)
879 error("could not find .symtab section");
880 strtab_sec = &shdr[symtab_sec->sh_link];
881
882 symtab = load_data(fd, symtab_sec->sh_offset, symtab_sec->sh_size);
883 strtab = load_data(fd, strtab_sec->sh_offset, strtab_sec->sh_size);
884
efdea7bf 885 nb_syms = symtab_sec->sh_size / sizeof(ElfW(Sym));
367e86e8
FB		 886 if (do_swap) {
887 for(i = 0, sym = symtab; i < nb_syms; i++, sym++) {
888 swab32s(&sym->st_name);
ce11fedc
FB		 889 swabls(&sym->st_value);
890 swabls(&sym->st_size);
367e86e8
FB		 891 swab16s(&sym->st_shndx);
892 }
893 }
894
dc99065b 895 if (do_print_enum) {
0ea00c9a 896 fprintf(outfile, "DEF(end, 0)\n");
dc99065b
FB		 897 for(i = 0, sym = symtab; i < nb_syms; i++, sym++) {
898 const char *name, *p;
899 name = strtab + sym->st_name;
900 if (strstart(name, OP_PREFIX, &p)) {
0ea00c9a
FB		 901 gen_code(name, sym->st_value, sym->st_size, outfile,
902 text, relocs, nb_relocs, reloc_sh_type, symtab, strtab, 2);
dc99065b
FB		 903 }
904 }
905 } else {
906 /* generate big code generation switch */
efdea7bf 907#ifdef HOST_ALPHA
74c95119
FB		 908fprintf(outfile,
909"register int gp asm(\"$29\");\n"
910"static inline void immediate_ldah(void *p, int val) {\n"
911" uint32_t *dest = p;\n"
912" long high = ((val >> 16) + ((val >> 15) & 1)) & 0xffff;\n"
913"\n"
914" *dest &= ~0xffff;\n"
915" *dest |= high;\n"
916" *dest |= 31 << 16;\n"
917"}\n"
918"static inline void immediate_lda(void *dest, int val) {\n"
919" *(uint16_t *) dest = val;\n"
920"}\n"
921"void fix_bsr(void *p, int offset) {\n"
922" uint32_t *dest = p;\n"
923" *dest &= ~((1 << 21) - 1);\n"
924" *dest |= (offset >> 2) & ((1 << 21) - 1);\n"
925"}\n");
efdea7bf 926#endif
dc99065b
FB		 927fprintf(outfile,
928"int dyngen_code(uint8_t *gen_code_buf,\n"
929" const uint16_t *opc_buf, const uint32_t *opparam_buf)\n"
930"{\n"
931" uint8_t *gen_code_ptr;\n"
932" const uint16_t *opc_ptr;\n"
933" const uint32_t *opparam_ptr;\n"
934" gen_code_ptr = gen_code_buf;\n"
935" opc_ptr = opc_buf;\n"
936" opparam_ptr = opparam_buf;\n"
937" for(;;) {\n"
938" switch(*opc_ptr++) {\n"
939);
367e86e8 940
dc99065b
FB		 941 for(i = 0, sym = symtab; i < nb_syms; i++, sym++) {
942 const char *name;
943 name = strtab + sym->st_name;
944 if (strstart(name, OP_PREFIX, NULL)) {
367e86e8 945#if 0
dc99065b
FB		 946 printf("%4d: %s pos=0x%08x len=%d\n",
947 i, name, sym->st_value, sym->st_size);
367e86e8 948#endif
dc99065b
FB		 949 if (sym->st_shndx != (text_sec - shdr))
950 error("invalid section for opcode (0x%x)", sym->st_shndx);
951 gen_code(name, sym->st_value, sym->st_size, outfile,
952 text, relocs, nb_relocs, reloc_sh_type, symtab, strtab, 1);
953 }
954 }
955
956fprintf(outfile,
957" default:\n"
958" goto the_end;\n"
959" }\n"
960" }\n"
961" the_end:\n"
962);
963
964/* generate a return */
ce11fedc 965 switch(ELF_ARCH) {
dc99065b
FB		 966 case EM_386:
967 fprintf(outfile, "*gen_code_ptr++ = 0xc3; /* ret */\n");
968 break;
04369ff2
FB		 969 case EM_PPC:
970 fprintf(outfile, "*((uint32_t *)gen_code_ptr)++ = 0x4e800020; /* blr */\n");
971 break;
fb3e5849
FB		 972 case EM_S390:
973 fprintf(outfile, "*((uint16_t *)gen_code_ptr)++ = 0x07fe; /* br %%r14 */\n");
974 break;
efdea7bf
FB		 975 case EM_ALPHA:
976 fprintf(outfile, "*((uint32_t *)gen_code_ptr)++ = 0x6bfa8001; /* ret */\n");
977 break;
978 case EM_IA_64:
979 fprintf(outfile, "*((uint32_t *)gen_code_ptr)++ = 0x00840008; /* br.ret.sptk.many b0;; */\n");
980 break;
d014c98c
FB		 981 case EM_SPARC:
982 case EM_SPARC32PLUS:
983 case EM_SPARCV9:
984 /* Fill the delay slot. */
985 fprintf(outfile, "*((uint32_t *)gen_code_ptr) = *((uint32_t *)gen_code_ptr - 1); /* delay slot */\n");
986 fprintf(outfile, "*((uint32_t *)gen_code_ptr - 1) = 0x81c3e008; /* retl */\n");
987 fprintf(outfile, "gen_code_ptr++;\n");
988 break;
efdea7bf
FB		 989 default:
990 error("unknown ELF architecture");
dc99065b
FB		 991 }
992
993 fprintf(outfile, "return gen_code_ptr - gen_code_buf;\n");
994 fprintf(outfile, "}\n\n");
995
996/* generate gen_xxx functions */
997/* XXX: suppress the use of these functions to simplify code */
998 for(i = 0, sym = symtab; i < nb_syms; i++, sym++) {
999 const char *name;
1000 name = strtab + sym->st_name;
1001 if (strstart(name, OP_PREFIX, NULL)) {
1002 if (sym->st_shndx != (text_sec - shdr))
1003 error("invalid section for opcode (0x%x)", sym->st_shndx);
1004 gen_code(name, sym->st_value, sym->st_size, outfile,
1005 text, relocs, nb_relocs, reloc_sh_type, symtab, strtab, 0);
1006 }
367e86e8
FB		 1007 }
1008 }
1009
1010 close(fd);
1011 return 0;
1012}
1013
1014void usage(void)
1015{
1016 printf("dyngen (c) 2003 Fabrice Bellard\n"
dc99065b
FB		 1017 "usage: dyngen [-o outfile] [-c] objfile\n"
1018 "Generate a dynamic code generator from an object file\n"
1019 "-c output enum of operations\n"
1020 );
367e86e8
FB		 1021 exit(1);
1022}
1023
1024int main(int argc, char **argv)
1025{
dc99065b 1026 int c, do_print_enum;
367e86e8
FB		 1027 const char *filename, *outfilename;
1028 FILE *outfile;
1029
1030 outfilename = "out.c";
dc99065b 1031 do_print_enum = 0;
367e86e8 1032 for(;;) {
dc99065b 1033 c = getopt(argc, argv, "ho:c");
367e86e8
FB		 1034 if (c == -1)
1035 break;
1036 switch(c) {
1037 case 'h':
1038 usage();
1039 break;
1040 case 'o':
1041 outfilename = optarg;
1042 break;
dc99065b
FB		 1043 case 'c':
1044 do_print_enum = 1;
1045 break;
367e86e8
FB		 1046 }
1047 }
1048 if (optind >= argc)
1049 usage();
1050 filename = argv[optind];
1051 outfile = fopen(outfilename, "w");
1052 if (!outfile)
1053 error("could not open '%s'", outfilename);
dc99065b 1054 load_elf(filename, outfile, do_print_enum);
367e86e8
FB		 1055 fclose(outfile);
1056 return 0;
1057}
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