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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
;
277 host_ulong start_offset
;
279 uint8_t args_present
[MAX_ARGS
];
280 const char *sym_name
, *p
;
283 /* Compute exact size excluding prologue and epilogue instructions.
284 * Increment start_offset to skip epilogue instructions, then compute
285 * copy_size the indicate the size of the remaining instructions (in
288 p_start
= text
+ offset
;
289 p_end
= p_start
+ size
;
290 start_offset
= offset
;
297 error("empty code for %s", name
);
299 error("ret expected at the end of %s", name
);
300 copy_size
= p
- p_start
;
306 p
= (void *)(p_end
- 4);
308 error("empty code for %s", name
);
309 if (get32((uint32_t *)p
) != 0x4e800020)
310 error("blr expected at the end of %s", name
);
311 copy_size
= p
- p_start
;
317 p
= (void *)(p_end
- 2);
319 error("empty code for %s", name
);
320 if (get16((uint16_t *)p
) != 0x07fe && get16((uint16_t *)p
) != 0x07f4)
321 error("br %%r14 expected at the end of %s", name
);
322 copy_size
= p
- p_start
;
330 error("empty code for %s", name
);
331 if (get32((uint32_t *)p
) != 0x6bfa8001)
332 error("ret expected at the end of %s", name
);
333 copy_size
= p
- p_start
;
339 p
= (void *)(p_end
- 4);
341 error("empty code for %s", name
);
342 /* br.ret.sptk.many b0;; */
344 if (get32((uint32_t *)p
) != 0x00840008)
345 error("br.ret.sptk.many b0;; expected at the end of %s", name
);
346 copy_size
= p
- p_start
;
352 uint32_t start_insn
, end_insn1
, end_insn2
, skip_insn
;
354 p
= (void *)(p_end
- 8);
356 error("empty code for %s", name
);
357 start_insn
= get32((uint32_t *)(p_start
+ 0x0));
358 end_insn1
= get32((uint32_t *)(p
+ 0x0));
359 end_insn2
= get32((uint32_t *)(p
+ 0x4));
360 if ((start_insn
& ~0x1fff) == 0x9de3a000) {
363 if ((int)(start_insn
| ~0x1fff) < -128)
364 error("Found bogus save at the start of %s", name
);
365 if (end_insn1
!= 0x81c7e008 || end_insn2
!= 0x81e80000)
366 error("ret; restore; not found at end of %s", name
);
368 error("No save at the beginning of %s", name
);
371 /* Skip a preceeding nop, if present. */
373 skip_insn
= get32((uint32_t *)(p
- 0x4));
374 if (skip_insn
== 0x01000000)
378 copy_size
= p
- p_start
;
383 uint32_t start_insn
, end_insn1
, end_insn2
, skip_insn
;
385 p
= (void *)(p_end
- 8);
387 error("empty code for %s", name
);
388 start_insn
= get32((uint32_t *)(p_start
+ 0x0));
389 end_insn1
= get32((uint32_t *)(p
+ 0x0));
390 end_insn2
= get32((uint32_t *)(p
+ 0x4));
391 if ((start_insn
& ~0x1fff) == 0x9de3a000) {
394 if ((int)(start_insn
| ~0x1fff) < -256)
395 error("Found bogus save at the start of %s", name
);
396 if (end_insn1
!= 0x81c7e008 || end_insn2
!= 0x81e80000)
397 error("ret; restore; not found at end of %s", name
);
399 error("No save at the beginning of %s", name
);
402 /* Skip a preceeding nop, if present. */
404 skip_insn
= get32((uint32_t *)(p
- 0x4));
405 if (skip_insn
== 0x01000000)
409 copy_size
= p
- p_start
;
413 error("unknown ELF architecture");
416 /* compute the number of arguments by looking at the relocations */
417 for(i
= 0;i
< MAX_ARGS
; i
++)
420 for(i
= 0, rel
= relocs
;i
< nb_relocs
; i
++, rel
++) {
421 if (rel
->r_offset
>= start_offset
&&
422 rel
->r_offset
< start_offset
+ copy_size
) {
423 sym_name
= strtab
+ symtab
[ELFW(R_SYM
)(rel
->r_info
)].st_name
;
424 if (strstart(sym_name
, "__op_param", &p
)) {
425 n
= strtoul(p
, NULL
, 10);
427 error("too many arguments in %s", name
);
428 args_present
[n
- 1] = 1;
434 while (nb_args
< MAX_ARGS
&& args_present
[nb_args
])
436 for(i
= nb_args
; i
< MAX_ARGS
; i
++) {
438 error("inconsistent argument numbering in %s", name
);
441 if (gen_switch
== 2) {
442 fprintf(outfile
, "DEF(%s, %d)\n", name
+ 3, nb_args
);
443 } else if (gen_switch
== 1) {
446 fprintf(outfile
, "case INDEX_%s: {\n", name
);
448 fprintf(outfile
, " long ");
449 for(i
= 0; i
< nb_args
; i
++) {
451 fprintf(outfile
, ", ");
452 fprintf(outfile
, "param%d", i
+ 1);
454 fprintf(outfile
, ";\n");
456 fprintf(outfile
, " extern void %s();\n", name
);
458 for(i
= 0, rel
= relocs
;i
< nb_relocs
; i
++, rel
++) {
459 if (rel
->r_offset
>= start_offset
&&
460 rel
->r_offset
< start_offset
+ copy_size
) {
461 sym_name
= strtab
+ symtab
[ELFW(R_SYM
)(rel
->r_info
)].st_name
;
462 if (*sym_name
&& !strstart(sym_name
, "__op_param", &p
)) {
463 #if defined(HOST_SPARC)
464 if (sym_name
[0] == '.') {
466 "extern char __dot_%s __asm__(\"%s\");\n",
467 sym_name
+1, sym_name
);
471 fprintf(outfile
, "extern char %s;\n", sym_name
);
476 fprintf(outfile
, " memcpy(gen_code_ptr, (void *)((char *)&%s+%d), %d);\n", name
, start_offset
- offset
, copy_size
);
477 for(i
= 0; i
< nb_args
; i
++) {
478 fprintf(outfile
, " param%d = *opparam_ptr++;\n", i
+ 1);
481 /* patch relocations */
482 #if defined(HOST_I386)
487 for(i
= 0, rel
= relocs
;i
< nb_relocs
; i
++, rel
++) {
488 if (rel
->r_offset
>= start_offset
&&
489 rel
->r_offset
< start_offset
+ copy_size
) {
490 sym_name
= strtab
+ symtab
[ELFW(R_SYM
)(rel
->r_info
)].st_name
;
491 if (strstart(sym_name
, "__op_param", &p
)) {
492 snprintf(name
, sizeof(name
), "param%s", p
);
494 snprintf(name
, sizeof(name
), "(long)(&%s)", sym_name
);
496 type
= ELF32_R_TYPE(rel
->r_info
);
497 addend
= get32((uint32_t *)(text
+ rel
->r_offset
));
500 fprintf(outfile
, " *(uint32_t *)(gen_code_ptr + %d) = %s + %d;\n",
501 rel
->r_offset
- start_offset
, name
, addend
);
504 fprintf(outfile
, " *(uint32_t *)(gen_code_ptr + %d) = %s - (long)(gen_code_ptr + %d) + %d;\n",
505 rel
->r_offset
- start_offset
, name
, rel
->r_offset
- start_offset
, addend
);
508 error("unsupported i386 relocation (%d)", type
);
513 #elif defined(HOST_PPC)
518 for(i
= 0, rel
= relocs
;i
< nb_relocs
; i
++, rel
++) {
519 if (rel
->r_offset
>= start_offset
&&
520 rel
->r_offset
< start_offset
+ copy_size
) {
521 sym_name
= strtab
+ symtab
[ELFW(R_SYM
)(rel
->r_info
)].st_name
;
522 if (strstart(sym_name
, "__op_param", &p
)) {
523 snprintf(name
, sizeof(name
), "param%s", p
);
525 snprintf(name
, sizeof(name
), "(long)(&%s)", sym_name
);
527 type
= ELF32_R_TYPE(rel
->r_info
);
528 addend
= rel
->r_addend
;
531 fprintf(outfile
, " *(uint32_t *)(gen_code_ptr + %d) = %s + %d;\n",
532 rel
->r_offset
- start_offset
, name
, addend
);
534 case R_PPC_ADDR16_LO
:
535 fprintf(outfile
, " *(uint16_t *)(gen_code_ptr + %d) = (%s + %d);\n",
536 rel
->r_offset
- start_offset
, name
, addend
);
538 case R_PPC_ADDR16_HI
:
539 fprintf(outfile
, " *(uint16_t *)(gen_code_ptr + %d) = (%s + %d) >> 16;\n",
540 rel
->r_offset
- start_offset
, name
, addend
);
542 case R_PPC_ADDR16_HA
:
543 fprintf(outfile
, " *(uint16_t *)(gen_code_ptr + %d) = (%s + %d + 0x8000) >> 16;\n",
544 rel
->r_offset
- start_offset
, name
, addend
);
547 /* warning: must be at 32 MB distancy */
548 fprintf(outfile
, " *(uint32_t *)(gen_code_ptr + %d) = (*(uint32_t *)(gen_code_ptr + %d) & ~0x03fffffc) | ((%s - (long)(gen_code_ptr + %d) + %d) & 0x03fffffc);\n",
549 rel
->r_offset
- start_offset
, rel
->r_offset
- start_offset
, name
, rel
->r_offset
- start_offset
, addend
);
552 error("unsupported powerpc relocation (%d)", type
);
557 #elif defined(HOST_S390)
562 for(i
= 0, rel
= relocs
;i
< nb_relocs
; i
++, rel
++) {
563 if (rel
->r_offset
>= start_offset
&&
564 rel
->r_offset
< start_offset
+ copy_size
) {
565 sym_name
= strtab
+ symtab
[ELFW(R_SYM
)(rel
->r_info
)].st_name
;
566 if (strstart(sym_name
, "__op_param", &p
)) {
567 snprintf(name
, sizeof(name
), "param%s", p
);
569 snprintf(name
, sizeof(name
), "(long)(&%s)", sym_name
);
571 type
= ELF32_R_TYPE(rel
->r_info
);
572 addend
= rel
->r_addend
;
575 fprintf(outfile
, " *(uint32_t *)(gen_code_ptr + %d) = %s + %d;\n",
576 rel
->r_offset
- start_offset
, name
, addend
);
579 fprintf(outfile
, " *(uint16_t *)(gen_code_ptr + %d) = %s + %d;\n",
580 rel
->r_offset
- start_offset
, name
, addend
);
583 fprintf(outfile
, " *(uint8_t *)(gen_code_ptr + %d) = %s + %d;\n",
584 rel
->r_offset
- start_offset
, name
, addend
);
587 error("unsupported s390 relocation (%d)", type
);
592 #elif defined(HOST_ALPHA)
594 for (i
= 0, rel
= relocs
; i
< nb_relocs
; i
++, rel
++) {
595 if (rel
->r_offset
>= start_offset
&& rel
->r_offset
< start_offset
+ copy_size
) {
598 type
= ELF64_R_TYPE(rel
->r_info
);
599 sym_name
= strtab
+ symtab
[ELF64_R_SYM(rel
->r_info
)].st_name
;
602 /* The gp is just 32 bit, and never changes, so it's easiest to emit it
603 as an immediate instead of constructing it from the pv or ra. */
604 fprintf(outfile
, " immediate_ldah(gen_code_ptr + %ld, gp);\n",
605 rel
->r_offset
- start_offset
);
606 fprintf(outfile
, " immediate_lda(gen_code_ptr + %ld, gp);\n",
607 rel
->r_offset
- start_offset
+ rel
->r_addend
);
610 /* jsr to literal hint. Could be used to optimize to bsr. Ignore for
611 now, since some called functions (libc) need pv to be set up. */
614 /* Branch target prediction hint. Ignore for now. Should be already
615 correct for in-function jumps. */
617 case R_ALPHA_LITERAL
:
618 /* Load a literal from the GOT relative to the gp. Since there's only a
619 single gp, nothing is to be done. */
621 case R_ALPHA_GPRELHIGH
:
622 /* Handle fake relocations against __op_param symbol. Need to emit the
623 high part of the immediate value instead. Other symbols need no
624 special treatment. */
625 if (strstart(sym_name
, "__op_param", &p
))
626 fprintf(outfile
, " immediate_ldah(gen_code_ptr + %ld, param%s);\n",
627 rel
->r_offset
- start_offset
, p
);
629 case R_ALPHA_GPRELLOW
:
630 if (strstart(sym_name
, "__op_param", &p
))
631 fprintf(outfile
, " immediate_lda(gen_code_ptr + %ld, param%s);\n",
632 rel
->r_offset
- start_offset
, p
);
635 /* PC-relative jump. Tweak offset to skip the two instructions that try to
636 set up the gp from the pv. */
637 fprintf(outfile
, " fix_bsr(gen_code_ptr + %ld, (uint8_t *) &%s - (gen_code_ptr + %ld) + 4);\n",
638 rel
->r_offset
- start_offset
, sym_name
, rel
->r_offset
- start_offset
);
641 error("unsupported Alpha relocation (%d)", type
);
646 #elif defined(HOST_IA64)
651 for(i
= 0, rel
= relocs
;i
< nb_relocs
; i
++, rel
++) {
652 if (rel
->r_offset
>= start_offset
&& rel
->r_offset
< start_offset
+ copy_size
) {
653 sym_name
= strtab
+ symtab
[ELF64_R_SYM(rel
->r_info
)].st_name
;
654 if (strstart(sym_name
, "__op_param", &p
)) {
655 snprintf(name
, sizeof(name
), "param%s", p
);
657 snprintf(name
, sizeof(name
), "(long)(&%s)", sym_name
);
659 type
= ELF64_R_TYPE(rel
->r_info
);
660 addend
= rel
->r_addend
;
663 error("must implemnt R_IA64_LTOFF22 relocation");
664 case R_IA64_PCREL21B
:
665 error("must implemnt R_IA64_PCREL21B relocation");
667 error("unsupported ia64 relocation (%d)", type
);
672 #elif defined(HOST_SPARC)
677 for(i
= 0, rel
= relocs
;i
< nb_relocs
; i
++, rel
++) {
678 if (rel
->r_offset
>= start_offset
&&
679 rel
->r_offset
< start_offset
+ copy_size
) {
680 sym_name
= strtab
+ symtab
[ELF32_R_SYM(rel
->r_info
)].st_name
;
681 if (strstart(sym_name
, "__op_param", &p
)) {
682 snprintf(name
, sizeof(name
), "param%s", p
);
684 if (sym_name
[0] == '.')
685 snprintf(name
, sizeof(name
),
689 snprintf(name
, sizeof(name
),
690 "(long)(&%s)", sym_name
);
692 type
= ELF32_R_TYPE(rel
->r_info
);
693 addend
= rel
->r_addend
;
696 fprintf(outfile
, " *(uint32_t *)(gen_code_ptr + %d) = %s + %d;\n",
697 rel
->r_offset
- start_offset
, name
, addend
);
701 " *(uint32_t *)(gen_code_ptr + %d) = "
702 "((*(uint32_t *)(gen_code_ptr + %d)) "
704 " | (((%s + %d) >> 10) & 0x3fffff);\n",
705 rel
->r_offset
- start_offset
,
706 rel
->r_offset
- start_offset
,
711 " *(uint32_t *)(gen_code_ptr + %d) = "
712 "((*(uint32_t *)(gen_code_ptr + %d)) "
714 " | ((%s + %d) & 0x3ff);\n",
715 rel
->r_offset
- start_offset
,
716 rel
->r_offset
- start_offset
,
719 case R_SPARC_WDISP30
:
721 " *(uint32_t *)(gen_code_ptr + %d) = "
722 "((*(uint32_t *)(gen_code_ptr + %d)) "
724 " | ((((%s + %d) - (long)(gen_code_ptr + %d))>>2) "
726 rel
->r_offset
- start_offset
,
727 rel
->r_offset
- start_offset
,
729 rel
->r_offset
- start_offset
);
732 error("unsupported sparc relocation (%d)", type
);
737 #elif defined(HOST_SPARC64)
742 for(i
= 0, rel
= relocs
;i
< nb_relocs
; i
++, rel
++) {
743 if (rel
->r_offset
>= start_offset
&&
744 rel
->r_offset
< start_offset
+ copy_size
) {
745 sym_name
= strtab
+ symtab
[ELF64_R_SYM(rel
->r_info
)].st_name
;
746 if (strstart(sym_name
, "__op_param", &p
)) {
747 snprintf(name
, sizeof(name
), "param%s", p
);
749 snprintf(name
, sizeof(name
), "(long)(&%s)", sym_name
);
751 type
= ELF64_R_TYPE(rel
->r_info
);
752 addend
= rel
->r_addend
;
755 fprintf(outfile
, " *(uint32_t *)(gen_code_ptr + %d) = %s + %d;\n",
756 rel
->r_offset
- start_offset
, name
, addend
);
760 " *(uint32_t *)(gen_code_ptr + %d) = "
761 "((*(uint32_t *)(gen_code_ptr + %d)) "
763 " | (((%s + %d) >> 10) & 0x3fffff);\n",
764 rel
->r_offset
- start_offset
,
765 rel
->r_offset
- start_offset
,
770 " *(uint32_t *)(gen_code_ptr + %d) = "
771 "((*(uint32_t *)(gen_code_ptr + %d)) "
773 " | ((%s + %d) & 0x3ff);\n",
774 rel
->r_offset
- start_offset
,
775 rel
->r_offset
- start_offset
,
778 case R_SPARC_WDISP30
:
780 " *(uint32_t *)(gen_code_ptr + %d) = "
781 "((*(uint32_t *)(gen_code_ptr + %d)) "
783 " | ((((%s + %d) - (long)(gen_code_ptr + %d))>>2) "
785 rel
->r_offset
- start_offset
,
786 rel
->r_offset
- start_offset
,
788 rel
->r_offset
- start_offset
);
791 error("unsupported sparc64 relocation (%d)", type
);
797 #error unsupported CPU
799 fprintf(outfile
, " gen_code_ptr += %d;\n", copy_size
);
800 fprintf(outfile
, "}\n");
801 fprintf(outfile
, "break;\n\n");
803 fprintf(outfile
, "static inline void gen_%s(", name
);
805 fprintf(outfile
, "void");
807 for(i
= 0; i
< nb_args
; i
++) {
809 fprintf(outfile
, ", ");
810 fprintf(outfile
, "long param%d", i
+ 1);
813 fprintf(outfile
, ")\n");
814 fprintf(outfile
, "{\n");
815 for(i
= 0; i
< nb_args
; i
++) {
816 fprintf(outfile
, " *gen_opparam_ptr++ = param%d;\n", i
+ 1);
818 fprintf(outfile
, " *gen_opc_ptr++ = INDEX_%s;\n", name
);
819 fprintf(outfile
, "}\n\n");
823 /* load an elf object file */
824 int load_elf(const char *filename
, FILE *outfile
, int do_print_enum
)
828 struct elf_shdr
*sec
, *shdr
, *symtab_sec
, *strtab_sec
, *text_sec
;
830 ElfW(Sym
) *symtab
, *sym
;
831 char *shstr
, *strtab
;
834 int nb_relocs
, reloc_sh_type
;
836 fd
= open(filename
, O_RDONLY
);
838 error("can't open file '%s'", filename
);
840 /* Read ELF header. */
841 if (read(fd
, &ehdr
, sizeof (ehdr
)) != sizeof (ehdr
))
842 error("unable to read file header");
844 /* Check ELF identification. */
845 if (ehdr
.e_ident
[EI_MAG0
] != ELFMAG0
846 || ehdr
.e_ident
[EI_MAG1
] != ELFMAG1
847 || ehdr
.e_ident
[EI_MAG2
] != ELFMAG2
848 || ehdr
.e_ident
[EI_MAG3
] != ELFMAG3
849 || ehdr
.e_ident
[EI_VERSION
] != EV_CURRENT
) {
850 error("bad ELF header");
853 do_swap
= elf_must_swap(&ehdr
);
855 elf_swap_ehdr(&ehdr
);
856 if (ehdr
.e_ident
[EI_CLASS
] != ELF_CLASS
)
857 error("Unsupported ELF class");
858 if (ehdr
.e_type
!= ET_REL
)
859 error("ELF object file expected");
860 if (ehdr
.e_version
!= EV_CURRENT
)
861 error("Invalid ELF version");
862 if (!elf_check_arch(ehdr
.e_machine
))
863 error("Unsupported CPU (e_machine=%d)", ehdr
.e_machine
);
865 /* read section headers */
866 shdr
= load_data(fd
, ehdr
.e_shoff
, ehdr
.e_shnum
* sizeof(struct elf_shdr
));
868 for(i
= 0; i
< ehdr
.e_shnum
; i
++) {
869 elf_swap_shdr(&shdr
[i
]);
873 sec
= &shdr
[ehdr
.e_shstrndx
];
874 shstr
= load_data(fd
, sec
->sh_offset
, sec
->sh_size
);
878 text_sec
= find_elf_section(shdr
, ehdr
.e_shnum
, shstr
, ".text");
880 error("could not find .text section");
881 text
= load_data(fd
, text_sec
->sh_offset
, text_sec
->sh_size
);
883 /* find text relocations, if any */
887 for(i
= 0; i
< ehdr
.e_shnum
; i
++) {
889 if ((sec
->sh_type
== SHT_REL
|| sec
->sh_type
== SHT_RELA
) &&
890 sec
->sh_info
== (text_sec
- shdr
)) {
891 reloc_sh_type
= sec
->sh_type
;
892 relocs
= load_data(fd
, sec
->sh_offset
, sec
->sh_size
);
893 nb_relocs
= sec
->sh_size
/ sec
->sh_entsize
;
895 if (sec
->sh_type
== SHT_REL
) {
896 ElfW(Rel
) *rel
= relocs
;
897 for(j
= 0, rel
= relocs
; j
< nb_relocs
; j
++, rel
++) {
898 swabls(&rel
->r_offset
);
899 swabls(&rel
->r_info
);
902 ElfW(Rela
) *rel
= relocs
;
903 for(j
= 0, rel
= relocs
; j
< nb_relocs
; j
++, rel
++) {
904 swabls(&rel
->r_offset
);
905 swabls(&rel
->r_info
);
906 swabls(&rel
->r_addend
);
914 symtab_sec
= find_elf_section(shdr
, ehdr
.e_shnum
, shstr
, ".symtab");
916 error("could not find .symtab section");
917 strtab_sec
= &shdr
[symtab_sec
->sh_link
];
919 symtab
= load_data(fd
, symtab_sec
->sh_offset
, symtab_sec
->sh_size
);
920 strtab
= load_data(fd
, strtab_sec
->sh_offset
, strtab_sec
->sh_size
);
922 nb_syms
= symtab_sec
->sh_size
/ sizeof(ElfW(Sym
));
924 for(i
= 0, sym
= symtab
; i
< nb_syms
; i
++, sym
++) {
925 swab32s(&sym
->st_name
);
926 swabls(&sym
->st_value
);
927 swabls(&sym
->st_size
);
928 swab16s(&sym
->st_shndx
);
933 fprintf(outfile
, "DEF(end, 0)\n");
934 for(i
= 0, sym
= symtab
; i
< nb_syms
; i
++, sym
++) {
935 const char *name
, *p
;
936 name
= strtab
+ sym
->st_name
;
937 if (strstart(name
, OP_PREFIX
, &p
)) {
938 gen_code(name
, sym
->st_value
, sym
->st_size
, outfile
,
939 text
, relocs
, nb_relocs
, reloc_sh_type
, symtab
, strtab
, 2);
943 /* generate big code generation switch */
946 "register int gp asm(\"$29\");\n"
947 "static inline void immediate_ldah(void *p, int val) {\n"
948 " uint32_t *dest = p;\n"
949 " long high = ((val >> 16) + ((val >> 15) & 1)) & 0xffff;\n"
951 " *dest &= ~0xffff;\n"
953 " *dest |= 31 << 16;\n"
955 "static inline void immediate_lda(void *dest, int val) {\n"
956 " *(uint16_t *) dest = val;\n"
958 "void fix_bsr(void *p, int offset) {\n"
959 " uint32_t *dest = p;\n"
960 " *dest &= ~((1 << 21) - 1);\n"
961 " *dest |= (offset >> 2) & ((1 << 21) - 1);\n"
965 "int dyngen_code(uint8_t *gen_code_buf,\n"
966 " const uint16_t *opc_buf, const uint32_t *opparam_buf)\n"
968 " uint8_t *gen_code_ptr;\n"
969 " const uint16_t *opc_ptr;\n"
970 " const uint32_t *opparam_ptr;\n"
971 " gen_code_ptr = gen_code_buf;\n"
972 " opc_ptr = opc_buf;\n"
973 " opparam_ptr = opparam_buf;\n");
975 /* Generate prologue, if needed. */
978 fprintf(outfile
, "*((uint32_t *)gen_code_ptr)++ = 0x9c23a080; /* sub %%sp, 128, %%sp */\n");
979 fprintf(outfile
, "*((uint32_t *)gen_code_ptr)++ = 0xbc27a080; /* sub %%fp, 128, %%fp */\n");
983 fprintf(outfile
, "*((uint32_t *)gen_code_ptr)++ = 0x9c23a100; /* sub %%sp, 256, %%sp */\n");
984 fprintf(outfile
, "*((uint32_t *)gen_code_ptr)++ = 0xbc27a100; /* sub %%fp, 256, %%fp */\n");
990 " switch(*opc_ptr++) {\n"
993 for(i
= 0, sym
= symtab
; i
< nb_syms
; i
++, sym
++) {
995 name
= strtab
+ sym
->st_name
;
996 if (strstart(name
, OP_PREFIX
, NULL
)) {
998 printf("%4d: %s pos=0x%08x len=%d\n",
999 i
, name
, sym
->st_value
, sym
->st_size
);
1001 if (sym
->st_shndx
!= (text_sec
- shdr
))
1002 error("invalid section for opcode (0x%x)", sym
->st_shndx
);
1003 gen_code(name
, sym
->st_value
, sym
->st_size
, outfile
,
1004 text
, relocs
, nb_relocs
, reloc_sh_type
, symtab
, strtab
, 1);
1016 /* generate epilogue */
1019 fprintf(outfile
, "*gen_code_ptr++ = 0xc3; /* ret */\n");
1022 fprintf(outfile
, "*((uint32_t *)gen_code_ptr)++ = 0x4e800020; /* blr */\n");
1025 fprintf(outfile
, "*((uint16_t *)gen_code_ptr)++ = 0x07fe; /* br %%r14 */\n");
1028 fprintf(outfile
, "*((uint32_t *)gen_code_ptr)++ = 0x6bfa8001; /* ret */\n");
1031 fprintf(outfile
, "*((uint32_t *)gen_code_ptr)++ = 0x00840008; /* br.ret.sptk.many b0;; */\n");
1034 case EM_SPARC32PLUS
:
1035 fprintf(outfile
, "*((uint32_t *)gen_code_ptr)++ = 0xbc07a080; /* add %%fp, 256, %%fp */\n");
1036 fprintf(outfile
, "*((uint32_t *)gen_code_ptr)++ = 0x81c62008; /* jmpl %%i0 + 8, %%g0 */\n");
1037 fprintf(outfile
, "*((uint32_t *)gen_code_ptr)++ = 0x9c03a080; /* add %%sp, 256, %%sp */\n");
1040 fprintf(outfile
, "*((uint32_t *)gen_code_ptr)++ = 0x81c7e008; /* ret */\n");
1041 fprintf(outfile
, "*((uint32_t *)gen_code_ptr)++ = 0x81e80000; /* restore */\n");
1044 error("unknown ELF architecture");
1047 fprintf(outfile
, "return gen_code_ptr - gen_code_buf;\n");
1048 fprintf(outfile
, "}\n\n");
1050 /* generate gen_xxx functions */
1051 /* XXX: suppress the use of these functions to simplify code */
1052 for(i
= 0, sym
= symtab
; i
< nb_syms
; i
++, sym
++) {
1054 name
= strtab
+ sym
->st_name
;
1055 if (strstart(name
, OP_PREFIX
, NULL
)) {
1056 if (sym
->st_shndx
!= (text_sec
- shdr
))
1057 error("invalid section for opcode (0x%x)", sym
->st_shndx
);
1058 gen_code(name
, sym
->st_value
, sym
->st_size
, outfile
,
1059 text
, relocs
, nb_relocs
, reloc_sh_type
, symtab
, strtab
, 0);
1070 printf("dyngen (c) 2003 Fabrice Bellard\n"
1071 "usage: dyngen [-o outfile] [-c] objfile\n"
1072 "Generate a dynamic code generator from an object file\n"
1073 "-c output enum of operations\n"
1078 int main(int argc
, char **argv
)
1080 int c
, do_print_enum
;
1081 const char *filename
, *outfilename
;
1084 outfilename
= "out.c";
1087 c
= getopt(argc
, argv
, "ho:c");
1095 outfilename
= optarg
;
1104 filename
= argv
[optind
];
1105 outfile
= fopen(outfilename
, "w");
1107 error("could not open '%s'", outfilename
);
1108 load_elf(filename
, outfile
, do_print_enum
);