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2 * Generic Dynamic compiler generator
4 * Copyright (c) 2003 Fabrice Bellard
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.
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.
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.
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
33 #if defined(HOST_I386)
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
40 #elif defined(HOST_PPC)
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
47 #elif defined(HOST_S390)
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
54 #elif defined(HOST_ALPHA)
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
61 #elif defined(HOST_IA64)
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
68 #elif defined(HOST_SPARC)
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
75 #elif defined(HOST_SPARC64)
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
83 #error unsupported CPU - please update the code
88 #if ELF_CLASS == ELFCLASS32
89 typedef int32_t host_long
;
90 typedef uint32_t host_ulong
;
91 #define swabls(x) swab32s(x)
93 typedef int64_t host_long
;
94 typedef uint64_t host_ulong
;
95 #define swabls(x) swab64s(x)
100 /* all dynamically generated functions begin with this code */
101 #define OP_PREFIX "op_"
103 int elf_must_swap(struct elfhdr
*h
)
111 return (h
->e_ident
[EI_DATA
] == ELFDATA2MSB
) !=
112 (swaptest
.b
[0] == 0);
115 void swab16s(uint16_t *p
)
120 void swab32s(uint32_t *p
)
125 void swab64s(uint64_t *p
)
130 void elf_swap_ehdr(struct elfhdr
*h
)
132 swab16s(&h
->e_type
); /* Object file type */
133 swab16s(&h
-> e_machine
); /* Architecture */
134 swab32s(&h
-> e_version
); /* Object file version */
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 */
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 */
147 void elf_swap_shdr(struct elf_shdr
*h
)
149 swab32s(&h
-> sh_name
); /* Section name (string tbl index) */
150 swab32s(&h
-> sh_type
); /* Section type */
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 */
155 swab32s(&h
-> sh_link
); /* Link to another section */
156 swab32s(&h
-> sh_info
); /* Additional section information */
157 swabls(&h
-> sh_addralign
); /* Section alignment */
158 swabls(&h
-> sh_entsize
); /* Entry size if section holds table */
161 void elf_swap_phdr(struct elf_phdr
*h
)
163 swab32s(&h
->p_type
); /* Segment type */
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 */
169 swab32s(&h
->p_flags
); /* Segment flags */
170 swabls(&h
->p_align
); /* Segment alignment */
175 uint16_t get16(uint16_t *p
)
184 uint32_t get32(uint32_t *p
)
193 void put16(uint16_t *p
, uint16_t val
)
200 void put32(uint32_t *p
, uint32_t val
)
207 void __attribute__((noreturn
)) __attribute__((format (printf
, 1, 2))) error(const char *fmt
, ...)
211 fprintf(stderr
, "dyngen: ");
212 vfprintf(stderr
, fmt
, ap
);
213 fprintf(stderr
, "\n");
219 struct elf_shdr
*find_elf_section(struct elf_shdr
*shdr
, int shnum
, const char *shstr
,
224 struct elf_shdr
*sec
;
226 for(i
= 0; i
< shnum
; i
++) {
230 shname
= shstr
+ sec
->sh_name
;
231 if (!strcmp(shname
, name
))
237 void *load_data(int fd
, long offset
, unsigned int size
)
244 lseek(fd
, offset
, SEEK_SET
);
245 if (read(fd
, data
, size
) != size
) {
252 int strstart(const char *str
, const char *val
, const char **ptr
)
270 /* generate op code */
271 void 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
)
276 uint8_t *p_start
, *p_end
;
278 uint8_t args_present
[MAX_ARGS
];
279 const char *sym_name
, *p
;
282 /* compute exact size excluding return instruction */
283 p_start
= text
+ offset
;
284 p_end
= p_start
+ size
;
291 error("empty code for %s", name
);
293 error("ret expected at the end of %s", name
);
294 copy_size
= p
- p_start
;
300 p
= (void *)(p_end
- 4);
302 error("empty code for %s", name
);
303 if (get32((uint32_t *)p
) != 0x4e800020)
304 error("blr expected at the end of %s", name
);
305 copy_size
= p
- p_start
;
311 p
= (void *)(p_end
- 2);
313 error("empty code for %s", name
);
314 if (get16((uint16_t *)p
) != 0x07fe && get16((uint16_t *)p
) != 0x07f4)
315 error("br %%r14 expected at the end of %s", name
);
316 copy_size
= 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
;
333 p
= (void *)(p_end
- 4);
335 error("empty code for %s", name
);
336 /* br.ret.sptk.many b0;; */
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
;
347 p
= (void *)(p_end
- 8);
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 "
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]",
358 get32((uint32_t *)(p
+ 0x0)),
359 get32((uint32_t *)(p
+ 0x4)));
361 copy_size
= p
- p_start
;
367 p
= (void *)(p_end
- 8);
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 "
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 "
379 get32((uint32_t *)(p
+ 0x0)),
380 get32((uint32_t *)(p
+ 0x4)));
381 copy_size
= p
- p_start
;
385 error("unknown ELF architecture");
388 /* compute the number of arguments by looking at the relocations */
389 for(i
= 0;i
< MAX_ARGS
; i
++)
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);
398 error("too many arguments in %s", name
);
399 args_present
[n
- 1] = 1;
405 while (nb_args
< MAX_ARGS
&& args_present
[nb_args
])
407 for(i
= nb_args
; i
< MAX_ARGS
; i
++) {
409 error("inconsistent argument numbering in %s", name
);
412 if (gen_switch
== 2) {
413 fprintf(outfile
, "DEF(%s, %d)\n", name
+ 3, nb_args
);
414 } else if (gen_switch
== 1) {
417 fprintf(outfile
, "case INDEX_%s: {\n", name
);
419 fprintf(outfile
, " long ");
420 for(i
= 0; i
< nb_args
; i
++) {
422 fprintf(outfile
, ", ");
423 fprintf(outfile
, "param%d", i
+ 1);
425 fprintf(outfile
, ";\n");
427 fprintf(outfile
, " extern void %s();\n", name
);
429 for(i
= 0, rel
= relocs
;i
< nb_relocs
; i
++, rel
++) {
430 if (rel
->r_offset
>= offset
&& rel
->r_offset
< offset
+ copy_size
) {
431 sym_name
= strtab
+ symtab
[ELFW(R_SYM
)(rel
->r_info
)].st_name
;
432 if (*sym_name
&& !strstart(sym_name
, "__op_param", &p
)) {
433 #if defined(HOST_SPARC)
434 if (sym_name
[0] == '.') {
436 "extern char __dot_%s __asm__(\"%s\");\n",
437 sym_name
+1, sym_name
);
441 fprintf(outfile
, "extern char %s;\n", sym_name
);
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);
451 /* patch relocations */
452 #if defined(HOST_I386)
457 for(i
= 0, rel
= relocs
;i
< nb_relocs
; i
++, rel
++) {
458 if (rel
->r_offset
>= offset
&& rel
->r_offset
< offset
+ copy_size
) {
459 sym_name
= strtab
+ symtab
[ELFW(R_SYM
)(rel
->r_info
)].st_name
;
460 if (strstart(sym_name
, "__op_param", &p
)) {
461 snprintf(name
, sizeof(name
), "param%s", p
);
463 snprintf(name
, sizeof(name
), "(long)(&%s)", sym_name
);
465 type
= ELF32_R_TYPE(rel
->r_info
);
466 addend
= get32((uint32_t *)(text
+ rel
->r_offset
));
469 fprintf(outfile
, " *(uint32_t *)(gen_code_ptr + %d) = %s + %d;\n",
470 rel
->r_offset
- offset
, name
, addend
);
473 fprintf(outfile
, " *(uint32_t *)(gen_code_ptr + %d) = %s - (long)(gen_code_ptr + %d) + %d;\n",
474 rel
->r_offset
- offset
, name
, rel
->r_offset
- offset
, addend
);
477 error("unsupported i386 relocation (%d)", type
);
482 #elif defined(HOST_PPC)
487 for(i
= 0, rel
= relocs
;i
< nb_relocs
; i
++, rel
++) {
488 if (rel
->r_offset
>= offset
&& rel
->r_offset
< offset
+ copy_size
) {
489 sym_name
= strtab
+ symtab
[ELFW(R_SYM
)(rel
->r_info
)].st_name
;
490 if (strstart(sym_name
, "__op_param", &p
)) {
491 snprintf(name
, sizeof(name
), "param%s", p
);
493 snprintf(name
, sizeof(name
), "(long)(&%s)", sym_name
);
495 type
= ELF32_R_TYPE(rel
->r_info
);
496 addend
= rel
->r_addend
;
499 fprintf(outfile
, " *(uint32_t *)(gen_code_ptr + %d) = %s + %d;\n",
500 rel
->r_offset
- offset
, name
, addend
);
502 case R_PPC_ADDR16_LO
:
503 fprintf(outfile
, " *(uint16_t *)(gen_code_ptr + %d) = (%s + %d);\n",
504 rel
->r_offset
- offset
, name
, addend
);
506 case R_PPC_ADDR16_HI
:
507 fprintf(outfile
, " *(uint16_t *)(gen_code_ptr + %d) = (%s + %d) >> 16;\n",
508 rel
->r_offset
- offset
, name
, addend
);
510 case R_PPC_ADDR16_HA
:
511 fprintf(outfile
, " *(uint16_t *)(gen_code_ptr + %d) = (%s + %d + 0x8000) >> 16;\n",
512 rel
->r_offset
- offset
, name
, addend
);
515 /* warning: must be at 32 MB distancy */
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",
517 rel
->r_offset
- offset
, rel
->r_offset
- offset
, name
, rel
->r_offset
- offset
, addend
);
520 error("unsupported powerpc relocation (%d)", type
);
525 #elif defined(HOST_S390)
530 for(i
= 0, rel
= relocs
;i
< nb_relocs
; i
++, rel
++) {
531 if (rel
->r_offset
>= offset
&& rel
->r_offset
< offset
+ copy_size
) {
532 sym_name
= strtab
+ symtab
[ELFW(R_SYM
)(rel
->r_info
)].st_name
;
533 if (strstart(sym_name
, "__op_param", &p
)) {
534 snprintf(name
, sizeof(name
), "param%s", p
);
536 snprintf(name
, sizeof(name
), "(long)(&%s)", sym_name
);
538 type
= ELF32_R_TYPE(rel
->r_info
);
539 addend
= rel
->r_addend
;
542 fprintf(outfile
, " *(uint32_t *)(gen_code_ptr + %d) = %s + %d;\n",
543 rel
->r_offset
- offset
, name
, addend
);
546 fprintf(outfile
, " *(uint16_t *)(gen_code_ptr + %d) = %s + %d;\n",
547 rel
->r_offset
- offset
, name
, addend
);
550 fprintf(outfile
, " *(uint8_t *)(gen_code_ptr + %d) = %s + %d;\n",
551 rel
->r_offset
- offset
, name
, addend
);
554 error("unsupported s390 relocation (%d)", type
);
559 #elif defined(HOST_ALPHA)
561 for (i
= 0, rel
= relocs
; i
< nb_relocs
; i
++, rel
++) {
562 if (rel
->r_offset
>= offset
&& rel
->r_offset
< offset
+ copy_size
) {
565 type
= ELF64_R_TYPE(rel
->r_info
);
566 sym_name
= strtab
+ symtab
[ELF64_R_SYM(rel
->r_info
)].st_name
;
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",
572 rel
->r_offset
- offset
);
573 fprintf(outfile
, " immediate_lda(gen_code_ptr + %ld, gp);\n",
574 rel
->r_offset
- offset
+ rel
->r_addend
);
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. */
581 /* Branch target prediction hint. Ignore for now. Should be already
582 correct for in-function jumps. */
584 case R_ALPHA_LITERAL
:
585 /* Load a literal from the GOT relative to the gp. Since there's only a
586 single gp, nothing is to be done. */
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
);
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
);
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
);
608 error("unsupported Alpha relocation (%d)", type
);
613 #elif defined(HOST_IA64)
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
);
624 snprintf(name
, sizeof(name
), "(long)(&%s)", sym_name
);
626 type
= ELF64_R_TYPE(rel
->r_info
);
627 addend
= rel
->r_addend
;
630 error("must implemnt R_IA64_LTOFF22 relocation");
631 case R_IA64_PCREL21B
:
632 error("must implemnt R_IA64_PCREL21B relocation");
634 error("unsupported ia64 relocation (%d)", type
);
639 #elif defined(HOST_SPARC)
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
);
650 if (sym_name
[0] == '.')
651 snprintf(name
, sizeof(name
),
655 snprintf(name
, sizeof(name
),
656 "(long)(&%s)", sym_name
);
658 type
= ELF32_R_TYPE(rel
->r_info
);
659 addend
= rel
->r_addend
;
662 fprintf(outfile
, " *(uint32_t *)(gen_code_ptr + %d) = %s + %d;\n",
663 rel
->r_offset
- offset
, name
, addend
);
667 " *(uint32_t *)(gen_code_ptr + %d) = "
668 "((*(uint32_t *)(gen_code_ptr + %d)) "
670 " | ((%s + %d) & 0x3fffff);\n",
671 rel
->r_offset
- offset
,
672 rel
->r_offset
- offset
,
677 " *(uint32_t *)(gen_code_ptr + %d) = "
678 "((*(uint32_t *)(gen_code_ptr + %d)) "
680 " | ((%s + %d) & 0x3ff);\n",
681 rel
->r_offset
- offset
,
682 rel
->r_offset
- offset
,
685 case R_SPARC_WDISP30
:
687 " *(uint32_t *)(gen_code_ptr + %d) = "
688 "((*(uint32_t *)(gen_code_ptr + %d)) "
690 " | ((((%s + %d) - (long)gen_code_ptr)>>2) "
692 rel
->r_offset
- offset
,
693 rel
->r_offset
- offset
,
697 error("unsupported sparc relocation (%d)", type
);
702 #elif defined(HOST_SPARC64)
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
);
713 snprintf(name
, sizeof(name
), "(long)(&%s)", sym_name
);
715 type
= ELF64_R_TYPE(rel
->r_info
);
716 addend
= rel
->r_addend
;
719 fprintf(outfile
, " *(uint32_t *)(gen_code_ptr + %d) = %s + %d;\n",
720 rel
->r_offset
- offset
, name
, addend
);
724 " *(uint32_t *)(gen_code_ptr + %d) = "
725 "((*(uint32_t *)(gen_code_ptr + %d)) "
727 " | ((%s + %d) & 0x3fffff);\n",
728 rel
->r_offset
- offset
,
729 rel
->r_offset
- offset
,
734 " *(uint32_t *)(gen_code_ptr + %d) = "
735 "((*(uint32_t *)(gen_code_ptr + %d)) "
737 " | ((%s + %d) & 0x3ff);\n",
738 rel
->r_offset
- offset
,
739 rel
->r_offset
- offset
,
742 case R_SPARC_WDISP30
:
744 " *(uint32_t *)(gen_code_ptr + %d) = "
745 "((*(uint32_t *)(gen_code_ptr + %d)) "
747 " | ((((%s + %d) - (long)gen_code_ptr)>>2) "
749 rel
->r_offset
- offset
,
750 rel
->r_offset
- offset
,
754 error("unsupported sparc64 relocation (%d)", type
);
760 #error unsupported CPU
762 fprintf(outfile
, " gen_code_ptr += %d;\n", copy_size
);
763 fprintf(outfile
, "}\n");
764 fprintf(outfile
, "break;\n\n");
766 fprintf(outfile
, "static inline void gen_%s(", name
);
768 fprintf(outfile
, "void");
770 for(i
= 0; i
< nb_args
; i
++) {
772 fprintf(outfile
, ", ");
773 fprintf(outfile
, "long param%d", i
+ 1);
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);
781 fprintf(outfile
, " *gen_opc_ptr++ = INDEX_%s;\n", name
);
782 fprintf(outfile
, "}\n\n");
786 /* load an elf object file */
787 int load_elf(const char *filename
, FILE *outfile
, int do_print_enum
)
791 struct elf_shdr
*sec
, *shdr
, *symtab_sec
, *strtab_sec
, *text_sec
;
793 ElfW(Sym
) *symtab
, *sym
;
794 char *shstr
, *strtab
;
797 int nb_relocs
, reloc_sh_type
;
799 fd
= open(filename
, O_RDONLY
);
801 error("can't open file '%s'", filename
);
803 /* Read ELF header. */
804 if (read(fd
, &ehdr
, sizeof (ehdr
)) != sizeof (ehdr
))
805 error("unable to read file header");
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
812 || ehdr
.e_ident
[EI_VERSION
] != EV_CURRENT
) {
813 error("bad ELF header");
816 do_swap
= elf_must_swap(&ehdr
);
818 elf_swap_ehdr(&ehdr
);
819 if (ehdr
.e_ident
[EI_CLASS
] != ELF_CLASS
)
820 error("Unsupported ELF class");
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");
825 if (!elf_check_arch(ehdr
.e_machine
))
826 error("Unsupported CPU (e_machine=%d)", ehdr
.e_machine
);
828 /* read section headers */
829 shdr
= load_data(fd
, ehdr
.e_shoff
, ehdr
.e_shnum
* sizeof(struct elf_shdr
));
831 for(i
= 0; i
< ehdr
.e_shnum
; i
++) {
832 elf_swap_shdr(&shdr
[i
]);
836 sec
= &shdr
[ehdr
.e_shstrndx
];
837 shstr
= load_data(fd
, sec
->sh_offset
, sec
->sh_size
);
841 text_sec
= find_elf_section(shdr
, ehdr
.e_shnum
, shstr
, ".text");
843 error("could not find .text section");
844 text
= load_data(fd
, text_sec
->sh_offset
, text_sec
->sh_size
);
846 /* find text relocations, if any */
850 for(i
= 0; i
< ehdr
.e_shnum
; 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
;
858 if (sec
->sh_type
== SHT_REL
) {
859 ElfW(Rel
) *rel
= relocs
;
860 for(j
= 0, rel
= relocs
; j
< nb_relocs
; j
++, rel
++) {
861 swabls(&rel
->r_offset
);
862 swabls(&rel
->r_info
);
865 ElfW(Rela
) *rel
= relocs
;
866 for(j
= 0, rel
= relocs
; j
< nb_relocs
; j
++, rel
++) {
867 swabls(&rel
->r_offset
);
868 swabls(&rel
->r_info
);
869 swabls(&rel
->r_addend
);
877 symtab_sec
= find_elf_section(shdr
, ehdr
.e_shnum
, shstr
, ".symtab");
879 error("could not find .symtab section");
880 strtab_sec
= &shdr
[symtab_sec
->sh_link
];
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
);
885 nb_syms
= symtab_sec
->sh_size
/ sizeof(ElfW(Sym
));
887 for(i
= 0, sym
= symtab
; i
< nb_syms
; i
++, sym
++) {
888 swab32s(&sym
->st_name
);
889 swabls(&sym
->st_value
);
890 swabls(&sym
->st_size
);
891 swab16s(&sym
->st_shndx
);
896 fprintf(outfile
, "DEF(end, 0)\n");
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
)) {
901 gen_code(name
, sym
->st_value
, sym
->st_size
, outfile
,
902 text
, relocs
, nb_relocs
, reloc_sh_type
, symtab
, strtab
, 2);
906 /* generate big code generation switch */
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"
914 " *dest &= ~0xffff;\n"
916 " *dest |= 31 << 16;\n"
918 "static inline void immediate_lda(void *dest, int val) {\n"
919 " *(uint16_t *) dest = val;\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"
928 "int dyngen_code(uint8_t *gen_code_buf,\n"
929 " const uint16_t *opc_buf, const uint32_t *opparam_buf)\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"
938 " switch(*opc_ptr++) {\n"
941 for(i
= 0, sym
= symtab
; i
< nb_syms
; i
++, sym
++) {
943 name
= strtab
+ sym
->st_name
;
944 if (strstart(name
, OP_PREFIX
, NULL
)) {
946 printf("%4d: %s pos=0x%08x len=%d\n",
947 i
, name
, sym
->st_value
, sym
->st_size
);
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);
964 /* generate a return */
967 fprintf(outfile
, "*gen_code_ptr++ = 0xc3; /* ret */\n");
970 fprintf(outfile
, "*((uint32_t *)gen_code_ptr)++ = 0x4e800020; /* blr */\n");
973 fprintf(outfile
, "*((uint16_t *)gen_code_ptr)++ = 0x07fe; /* br %%r14 */\n");
976 fprintf(outfile
, "*((uint32_t *)gen_code_ptr)++ = 0x6bfa8001; /* ret */\n");
979 fprintf(outfile
, "*((uint32_t *)gen_code_ptr)++ = 0x00840008; /* br.ret.sptk.many b0;; */\n");
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");
990 error("unknown ELF architecture");
993 fprintf(outfile
, "return gen_code_ptr - gen_code_buf;\n");
994 fprintf(outfile
, "}\n\n");
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
++) {
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);
1016 printf("dyngen (c) 2003 Fabrice Bellard\n"
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"
1024 int main(int argc
, char **argv
)
1026 int c
, do_print_enum
;
1027 const char *filename
, *outfilename
;
1030 outfilename
= "out.c";
1033 c
= getopt(argc
, argv
, "ho:c");
1041 outfilename
= optarg
;
1050 filename
= argv
[optind
];
1051 outfile
= fopen(outfilename
, "w");
1053 error("could not open '%s'", outfilename
);
1054 load_elf(filename
, outfile
, do_print_enum
);