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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
82 #elif defined(HOST_ARM)
84 #define ELF_CLASS ELFCLASS32
85 #define ELF_ARCH EM_ARM
86 #define elf_check_arch(x) ((x) == EM_ARM)
87 #define ELF_USES_RELOC
90 #error unsupported CPU - please update the code
95 #if ELF_CLASS == ELFCLASS32
96 typedef int32_t host_long
;
97 typedef uint32_t host_ulong
;
98 #define swabls(x) swab32s(x)
100 typedef int64_t host_long
;
101 typedef uint64_t host_ulong
;
102 #define swabls(x) swab64s(x)
105 #ifdef ELF_USES_RELOCA
106 #define SHT_RELOC SHT_RELA
108 #define SHT_RELOC SHT_REL
113 /* all dynamically generated functions begin with this code */
114 #define OP_PREFIX "op_"
116 int elf_must_swap(struct elfhdr
*h
)
124 return (h
->e_ident
[EI_DATA
] == ELFDATA2MSB
) !=
125 (swaptest
.b
[0] == 0);
128 void swab16s(uint16_t *p
)
133 void swab32s(uint32_t *p
)
138 void swab64s(uint64_t *p
)
143 void elf_swap_ehdr(struct elfhdr
*h
)
145 swab16s(&h
->e_type
); /* Object file type */
146 swab16s(&h
-> e_machine
); /* Architecture */
147 swab32s(&h
-> e_version
); /* Object file version */
148 swabls(&h
-> e_entry
); /* Entry point virtual address */
149 swabls(&h
-> e_phoff
); /* Program header table file offset */
150 swabls(&h
-> e_shoff
); /* Section header table file offset */
151 swab32s(&h
-> e_flags
); /* Processor-specific flags */
152 swab16s(&h
-> e_ehsize
); /* ELF header size in bytes */
153 swab16s(&h
-> e_phentsize
); /* Program header table entry size */
154 swab16s(&h
-> e_phnum
); /* Program header table entry count */
155 swab16s(&h
-> e_shentsize
); /* Section header table entry size */
156 swab16s(&h
-> e_shnum
); /* Section header table entry count */
157 swab16s(&h
-> e_shstrndx
); /* Section header string table index */
160 void elf_swap_shdr(struct elf_shdr
*h
)
162 swab32s(&h
-> sh_name
); /* Section name (string tbl index) */
163 swab32s(&h
-> sh_type
); /* Section type */
164 swabls(&h
-> sh_flags
); /* Section flags */
165 swabls(&h
-> sh_addr
); /* Section virtual addr at execution */
166 swabls(&h
-> sh_offset
); /* Section file offset */
167 swabls(&h
-> sh_size
); /* Section size in bytes */
168 swab32s(&h
-> sh_link
); /* Link to another section */
169 swab32s(&h
-> sh_info
); /* Additional section information */
170 swabls(&h
-> sh_addralign
); /* Section alignment */
171 swabls(&h
-> sh_entsize
); /* Entry size if section holds table */
174 void elf_swap_phdr(struct elf_phdr
*h
)
176 swab32s(&h
->p_type
); /* Segment type */
177 swabls(&h
->p_offset
); /* Segment file offset */
178 swabls(&h
->p_vaddr
); /* Segment virtual address */
179 swabls(&h
->p_paddr
); /* Segment physical address */
180 swabls(&h
->p_filesz
); /* Segment size in file */
181 swabls(&h
->p_memsz
); /* Segment size in memory */
182 swab32s(&h
->p_flags
); /* Segment flags */
183 swabls(&h
->p_align
); /* Segment alignment */
186 void elf_swap_rel(ELF_RELOC
*rel
)
188 swabls(&rel
->r_offset
);
189 swabls(&rel
->r_info
);
190 #ifdef ELF_USES_RELOCA
191 swabls(&rel
->r_addend
);
197 struct elf_shdr
*shdr
;
205 uint16_t get16(uint16_t *p
)
214 uint32_t get32(uint32_t *p
)
223 void put16(uint16_t *p
, uint16_t val
)
230 void put32(uint32_t *p
, uint32_t val
)
237 void __attribute__((noreturn
)) __attribute__((format (printf
, 1, 2))) error(const char *fmt
, ...)
241 fprintf(stderr
, "dyngen: ");
242 vfprintf(stderr
, fmt
, ap
);
243 fprintf(stderr
, "\n");
249 struct elf_shdr
*find_elf_section(struct elf_shdr
*shdr
, int shnum
, const char *shstr
,
254 struct elf_shdr
*sec
;
256 for(i
= 0; i
< shnum
; i
++) {
260 shname
= shstr
+ sec
->sh_name
;
261 if (!strcmp(shname
, name
))
267 int find_reloc(int sh_index
)
269 struct elf_shdr
*sec
;
272 for(i
= 0; i
< ehdr
.e_shnum
; i
++) {
274 if (sec
->sh_type
== SHT_RELOC
&& sec
->sh_info
== sh_index
)
280 void *load_data(int fd
, long offset
, unsigned int size
)
287 lseek(fd
, offset
, SEEK_SET
);
288 if (read(fd
, data
, size
) != size
) {
295 int strstart(const char *str
, const char *val
, const char **ptr
)
313 int arm_emit_ldr_info(const char *name
, unsigned long start_offset
,
314 FILE *outfile
, uint8_t *p_start
, uint8_t *p_end
,
315 ELF_RELOC
*relocs
, int nb_relocs
)
319 int offset
, min_offset
, pc_offset
, data_size
;
320 uint8_t data_allocated
[1024];
321 unsigned int data_index
;
323 memset(data_allocated
, 0, sizeof(data_allocated
));
326 min_offset
= p_end
- p_start
;
327 while (p
< p_start
+ min_offset
) {
328 insn
= get32((uint32_t *)p
);
329 if ((insn
& 0x0d5f0000) == 0x051f0000) {
330 /* ldr reg, [pc, #im] */
331 offset
= insn
& 0xfff;
332 if (!(insn
& 0x00800000))
334 if ((offset
& 3) !=0)
335 error("%s:%04x: ldr pc offset must be 32 bit aligned",
336 name
, start_offset
+ p
- p_start
);
337 pc_offset
= p
- p_start
+ offset
+ 8;
338 if (pc_offset
<= (p
- p_start
) ||
339 pc_offset
>= (p_end
- p_start
))
340 error("%s:%04x: ldr pc offset must point inside the function code",
341 name
, start_offset
+ p
- p_start
);
342 if (pc_offset
< min_offset
)
343 min_offset
= pc_offset
;
346 fprintf(outfile
, " arm_ldr_ptr->ptr = gen_code_ptr + %d;\n",
349 data_index
= ((p_end
- p_start
) - pc_offset
- 4) >> 2;
350 fprintf(outfile
, " arm_ldr_ptr->data_ptr = arm_data_ptr + %d;\n",
352 fprintf(outfile
, " arm_ldr_ptr++;\n");
353 if (data_index
>= sizeof(data_allocated
))
354 error("%s: too many data", name
);
355 if (!data_allocated
[data_index
]) {
358 const char *sym_name
, *p
;
361 data_allocated
[data_index
] = 1;
364 addend
= get32((uint32_t *)(p_start
+ pc_offset
));
366 for(i
= 0, rel
= relocs
;i
< nb_relocs
; i
++, rel
++) {
367 if (rel
->r_offset
== (pc_offset
+ start_offset
)) {
368 sym_name
= strtab
+ symtab
[ELFW(R_SYM
)(rel
->r_info
)].st_name
;
369 /* the compiler leave some unnecessary references to the code */
370 if (strstart(sym_name
, "__op_param", &p
)) {
371 snprintf(relname
, sizeof(relname
), "param%s", p
);
373 snprintf(relname
, sizeof(relname
), "(long)(&%s)", sym_name
);
375 type
= ELF32_R_TYPE(rel
->r_info
);
376 if (type
!= R_ARM_ABS32
)
377 error("%s: unsupported data relocation", name
);
381 fprintf(outfile
, " arm_data_ptr[%d] = 0x%x",
383 if (relname
[0] != '\0')
384 fprintf(outfile
, " + %s", relname
);
385 fprintf(outfile
, ";\n");
391 data_size
= (p_end
- p_start
) - min_offset
;
392 if (data_size
> 0 && outfile
) {
393 fprintf(outfile
, " arm_data_ptr += %d;\n", data_size
>> 2);
396 /* the last instruction must be a mov pc, lr */
400 insn
= get32((uint32_t *)p
);
401 if ((insn
& 0xffff0000) != 0xe91b0000) {
404 printf("%s: invalid epilog\n", name
);
413 /* generate op code */
414 void gen_code(const char *name
, host_ulong offset
, host_ulong size
,
415 FILE *outfile
, uint8_t *text
, ELF_RELOC
*relocs
, int nb_relocs
,
419 uint8_t *p_start
, *p_end
;
420 host_ulong start_offset
;
422 uint8_t args_present
[MAX_ARGS
];
423 const char *sym_name
, *p
;
426 /* Compute exact size excluding prologue and epilogue instructions.
427 * Increment start_offset to skip epilogue instructions, then compute
428 * copy_size the indicate the size of the remaining instructions (in
431 p_start
= text
+ offset
;
432 p_end
= p_start
+ size
;
433 start_offset
= offset
;
438 len
= p_end
- p_start
;
440 error("empty code for %s", name
);
441 if (p_end
[-1] == 0xc3) {
444 error("ret or jmp expected at the end of %s", name
);
452 p
= (void *)(p_end
- 4);
454 error("empty code for %s", name
);
455 if (get32((uint32_t *)p
) != 0x4e800020)
456 error("blr expected at the end of %s", name
);
457 copy_size
= p
- p_start
;
463 p
= (void *)(p_end
- 2);
465 error("empty code for %s", name
);
466 if (get16((uint16_t *)p
) != 0x07fe && get16((uint16_t *)p
) != 0x07f4)
467 error("br %%r14 expected at the end of %s", name
);
468 copy_size
= p
- p_start
;
476 error("empty code for %s", name
);
477 if (get32((uint32_t *)p
) != 0x6bfa8001)
478 error("ret expected at the end of %s", name
);
479 copy_size
= p
- p_start
;
485 p
= (void *)(p_end
- 4);
487 error("empty code for %s", name
);
488 /* br.ret.sptk.many b0;; */
490 if (get32((uint32_t *)p
) != 0x00840008)
491 error("br.ret.sptk.many b0;; expected at the end of %s", name
);
492 copy_size
= p
- p_start
;
498 uint32_t start_insn
, end_insn1
, end_insn2
;
500 p
= (void *)(p_end
- 8);
502 error("empty code for %s", name
);
503 start_insn
= get32((uint32_t *)(p_start
+ 0x0));
504 end_insn1
= get32((uint32_t *)(p
+ 0x0));
505 end_insn2
= get32((uint32_t *)(p
+ 0x4));
506 if ((start_insn
& ~0x1fff) == 0x9de3a000) {
509 if ((int)(start_insn
| ~0x1fff) < -128)
510 error("Found bogus save at the start of %s", name
);
511 if (end_insn1
!= 0x81c7e008 || end_insn2
!= 0x81e80000)
512 error("ret; restore; not found at end of %s", name
);
514 error("No save at the beginning of %s", name
);
517 /* Skip a preceeding nop, if present. */
519 skip_insn
= get32((uint32_t *)(p
- 0x4));
520 if (skip_insn
== 0x01000000)
524 copy_size
= p
- p_start
;
529 uint32_t start_insn
, end_insn1
, end_insn2
, skip_insn
;
531 p
= (void *)(p_end
- 8);
533 error("empty code for %s", name
);
534 start_insn
= get32((uint32_t *)(p_start
+ 0x0));
535 end_insn1
= get32((uint32_t *)(p
+ 0x0));
536 end_insn2
= get32((uint32_t *)(p
+ 0x4));
537 if ((start_insn
& ~0x1fff) == 0x9de3a000) {
540 if ((int)(start_insn
| ~0x1fff) < -256)
541 error("Found bogus save at the start of %s", name
);
542 if (end_insn1
!= 0x81c7e008 || end_insn2
!= 0x81e80000)
543 error("ret; restore; not found at end of %s", name
);
545 error("No save at the beginning of %s", name
);
548 /* Skip a preceeding nop, if present. */
550 skip_insn
= get32((uint32_t *)(p
- 0x4));
551 if (skip_insn
== 0x01000000)
555 copy_size
= p
- p_start
;
560 if ((p_end
- p_start
) <= 16)
561 error("%s: function too small", name
);
562 if (get32((uint32_t *)p_start
) != 0xe1a0c00d ||
563 (get32((uint32_t *)(p_start
+ 4)) & 0xffff0000) != 0xe92d0000 ||
564 get32((uint32_t *)(p_start
+ 8)) != 0xe24cb004)
565 error("%s: invalid prolog", name
);
568 copy_size
= arm_emit_ldr_info(name
, start_offset
, NULL
, p_start
, p_end
,
573 error("unknown ELF architecture");
576 /* compute the number of arguments by looking at the relocations */
577 for(i
= 0;i
< MAX_ARGS
; i
++)
580 for(i
= 0, rel
= relocs
;i
< nb_relocs
; i
++, rel
++) {
581 if (rel
->r_offset
>= start_offset
&&
582 rel
->r_offset
< start_offset
+ (p_end
- p_start
)) {
583 sym_name
= strtab
+ symtab
[ELFW(R_SYM
)(rel
->r_info
)].st_name
;
584 if (strstart(sym_name
, "__op_param", &p
)) {
585 n
= strtoul(p
, NULL
, 10);
587 error("too many arguments in %s", name
);
588 args_present
[n
- 1] = 1;
594 while (nb_args
< MAX_ARGS
&& args_present
[nb_args
])
596 for(i
= nb_args
; i
< MAX_ARGS
; i
++) {
598 error("inconsistent argument numbering in %s", name
);
601 if (gen_switch
== 2) {
602 fprintf(outfile
, "DEF(%s, %d, %d)\n", name
+ 3, nb_args
, copy_size
);
603 } else if (gen_switch
== 1) {
606 fprintf(outfile
, "case INDEX_%s: {\n", name
);
608 fprintf(outfile
, " long ");
609 for(i
= 0; i
< nb_args
; i
++) {
611 fprintf(outfile
, ", ");
612 fprintf(outfile
, "param%d", i
+ 1);
614 fprintf(outfile
, ";\n");
616 fprintf(outfile
, " extern void %s();\n", name
);
618 for(i
= 0, rel
= relocs
;i
< nb_relocs
; i
++, rel
++) {
619 if (rel
->r_offset
>= start_offset
&&
620 rel
->r_offset
< start_offset
+ (p_end
- p_start
)) {
621 sym_name
= strtab
+ symtab
[ELFW(R_SYM
)(rel
->r_info
)].st_name
;
623 !strstart(sym_name
, "__op_param", NULL
) &&
624 !strstart(sym_name
, "__op_jmp", NULL
)) {
625 #if defined(HOST_SPARC)
626 if (sym_name
[0] == '.') {
628 "extern char __dot_%s __asm__(\"%s\");\n",
629 sym_name
+1, sym_name
);
633 fprintf(outfile
, "extern char %s;\n", sym_name
);
638 fprintf(outfile
, " memcpy(gen_code_ptr, (void *)((char *)&%s+%d), %d);\n", name
, start_offset
- offset
, copy_size
);
640 /* emit code offset information */
643 const char *sym_name
, *p
;
647 for(i
= 0, sym
= symtab
; i
< nb_syms
; i
++, sym
++) {
648 sym_name
= strtab
+ sym
->st_name
;
649 if (strstart(sym_name
, "__op_label", &p
)) {
652 unsigned long offset
;
654 /* test if the variable refers to a label inside
655 the code we are generating */
656 ptr
= sdata
[sym
->st_shndx
];
658 error("__op_labelN in invalid section");
659 offset
= sym
->st_value
;
661 #ifdef ELF_USES_RELOCA
663 int reloc_shndx
, nb_relocs1
, j
;
665 /* try to find a matching relocation */
666 reloc_shndx
= find_reloc(sym
->st_shndx
);
668 nb_relocs1
= shdr
[reloc_shndx
].sh_size
/
669 shdr
[reloc_shndx
].sh_entsize
;
670 rel
= (ELF_RELOC
*)sdata
[reloc_shndx
];
671 for(j
= 0; j
< nb_relocs1
; j
++) {
672 if (rel
->r_offset
== offset
) {
673 addend
= rel
->r_addend
;
681 val
= *(target_ulong
*)(ptr
+ offset
);
684 if (val
>= start_offset
&& val
< start_offset
+ copy_size
) {
685 n
= strtol(p
, NULL
, 10);
686 fprintf(outfile
, " label_offsets[%d] = %d + (gen_code_ptr - gen_code_buf);\n", n
, val
- start_offset
);
692 /* load parameres in variables */
693 for(i
= 0; i
< nb_args
; i
++) {
694 fprintf(outfile
, " param%d = *opparam_ptr++;\n", i
+ 1);
697 /* patch relocations */
698 #if defined(HOST_I386)
703 for(i
= 0, rel
= relocs
;i
< nb_relocs
; i
++, rel
++) {
704 if (rel
->r_offset
>= start_offset
&&
705 rel
->r_offset
< start_offset
+ copy_size
) {
706 sym_name
= strtab
+ symtab
[ELFW(R_SYM
)(rel
->r_info
)].st_name
;
707 if (strstart(sym_name
, "__op_param", &p
)) {
708 snprintf(name
, sizeof(name
), "param%s", p
);
710 snprintf(name
, sizeof(name
), "(long)(&%s)", sym_name
);
712 type
= ELF32_R_TYPE(rel
->r_info
);
713 addend
= get32((uint32_t *)(text
+ rel
->r_offset
));
716 fprintf(outfile
, " *(uint32_t *)(gen_code_ptr + %d) = %s + %d;\n",
717 rel
->r_offset
- start_offset
, name
, addend
);
720 fprintf(outfile
, " *(uint32_t *)(gen_code_ptr + %d) = %s - (long)(gen_code_ptr + %d) + %d;\n",
721 rel
->r_offset
- start_offset
, name
, rel
->r_offset
- start_offset
, addend
);
724 error("unsupported i386 relocation (%d)", type
);
729 #elif defined(HOST_PPC)
734 for(i
= 0, rel
= relocs
;i
< nb_relocs
; i
++, rel
++) {
735 if (rel
->r_offset
>= start_offset
&&
736 rel
->r_offset
< start_offset
+ copy_size
) {
737 sym_name
= strtab
+ symtab
[ELFW(R_SYM
)(rel
->r_info
)].st_name
;
738 if (strstart(sym_name
, "__op_jmp", &p
)) {
740 n
= strtol(p
, NULL
, 10);
741 /* __op_jmp relocations are done at
742 runtime to do translated block
743 chaining: the offset of the instruction
744 needs to be stored */
745 fprintf(outfile
, " jmp_offsets[%d] = %d + (gen_code_ptr - gen_code_buf);\n",
746 n
, rel
->r_offset
- start_offset
);
750 if (strstart(sym_name
, "__op_param", &p
)) {
751 snprintf(name
, sizeof(name
), "param%s", p
);
753 snprintf(name
, sizeof(name
), "(long)(&%s)", sym_name
);
755 type
= ELF32_R_TYPE(rel
->r_info
);
756 addend
= rel
->r_addend
;
759 fprintf(outfile
, " *(uint32_t *)(gen_code_ptr + %d) = %s + %d;\n",
760 rel
->r_offset
- start_offset
, name
, addend
);
762 case R_PPC_ADDR16_LO
:
763 fprintf(outfile
, " *(uint16_t *)(gen_code_ptr + %d) = (%s + %d);\n",
764 rel
->r_offset
- start_offset
, name
, addend
);
766 case R_PPC_ADDR16_HI
:
767 fprintf(outfile
, " *(uint16_t *)(gen_code_ptr + %d) = (%s + %d) >> 16;\n",
768 rel
->r_offset
- start_offset
, name
, addend
);
770 case R_PPC_ADDR16_HA
:
771 fprintf(outfile
, " *(uint16_t *)(gen_code_ptr + %d) = (%s + %d + 0x8000) >> 16;\n",
772 rel
->r_offset
- start_offset
, name
, addend
);
775 /* warning: must be at 32 MB distancy */
776 fprintf(outfile
, " *(uint32_t *)(gen_code_ptr + %d) = (*(uint32_t *)(gen_code_ptr + %d) & ~0x03fffffc) | ((%s - (long)(gen_code_ptr + %d) + %d) & 0x03fffffc);\n",
777 rel
->r_offset
- start_offset
, rel
->r_offset
- start_offset
, name
, rel
->r_offset
- start_offset
, addend
);
780 error("unsupported powerpc relocation (%d)", type
);
785 #elif defined(HOST_S390)
790 for(i
= 0, rel
= relocs
;i
< nb_relocs
; i
++, rel
++) {
791 if (rel
->r_offset
>= start_offset
&&
792 rel
->r_offset
< start_offset
+ copy_size
) {
793 sym_name
= strtab
+ symtab
[ELFW(R_SYM
)(rel
->r_info
)].st_name
;
794 if (strstart(sym_name
, "__op_param", &p
)) {
795 snprintf(name
, sizeof(name
), "param%s", p
);
797 snprintf(name
, sizeof(name
), "(long)(&%s)", sym_name
);
799 type
= ELF32_R_TYPE(rel
->r_info
);
800 addend
= rel
->r_addend
;
803 fprintf(outfile
, " *(uint32_t *)(gen_code_ptr + %d) = %s + %d;\n",
804 rel
->r_offset
- start_offset
, name
, addend
);
807 fprintf(outfile
, " *(uint16_t *)(gen_code_ptr + %d) = %s + %d;\n",
808 rel
->r_offset
- start_offset
, name
, addend
);
811 fprintf(outfile
, " *(uint8_t *)(gen_code_ptr + %d) = %s + %d;\n",
812 rel
->r_offset
- start_offset
, name
, addend
);
815 error("unsupported s390 relocation (%d)", type
);
820 #elif defined(HOST_ALPHA)
822 for (i
= 0, rel
= relocs
; i
< nb_relocs
; i
++, rel
++) {
823 if (rel
->r_offset
>= start_offset
&& rel
->r_offset
< start_offset
+ copy_size
) {
826 type
= ELF64_R_TYPE(rel
->r_info
);
827 sym_name
= strtab
+ symtab
[ELF64_R_SYM(rel
->r_info
)].st_name
;
830 /* The gp is just 32 bit, and never changes, so it's easiest to emit it
831 as an immediate instead of constructing it from the pv or ra. */
832 fprintf(outfile
, " immediate_ldah(gen_code_ptr + %ld, gp);\n",
833 rel
->r_offset
- start_offset
);
834 fprintf(outfile
, " immediate_lda(gen_code_ptr + %ld, gp);\n",
835 rel
->r_offset
- start_offset
+ rel
->r_addend
);
838 /* jsr to literal hint. Could be used to optimize to bsr. Ignore for
839 now, since some called functions (libc) need pv to be set up. */
842 /* Branch target prediction hint. Ignore for now. Should be already
843 correct for in-function jumps. */
845 case R_ALPHA_LITERAL
:
846 /* Load a literal from the GOT relative to the gp. Since there's only a
847 single gp, nothing is to be done. */
849 case R_ALPHA_GPRELHIGH
:
850 /* Handle fake relocations against __op_param symbol. Need to emit the
851 high part of the immediate value instead. Other symbols need no
852 special treatment. */
853 if (strstart(sym_name
, "__op_param", &p
))
854 fprintf(outfile
, " immediate_ldah(gen_code_ptr + %ld, param%s);\n",
855 rel
->r_offset
- start_offset
, p
);
857 case R_ALPHA_GPRELLOW
:
858 if (strstart(sym_name
, "__op_param", &p
))
859 fprintf(outfile
, " immediate_lda(gen_code_ptr + %ld, param%s);\n",
860 rel
->r_offset
- start_offset
, p
);
863 /* PC-relative jump. Tweak offset to skip the two instructions that try to
864 set up the gp from the pv. */
865 fprintf(outfile
, " fix_bsr(gen_code_ptr + %ld, (uint8_t *) &%s - (gen_code_ptr + %ld + 4) + 8);\n",
866 rel
->r_offset
- start_offset
, sym_name
, rel
->r_offset
- start_offset
);
869 error("unsupported Alpha relocation (%d)", type
);
874 #elif defined(HOST_IA64)
879 for(i
= 0, rel
= relocs
;i
< nb_relocs
; i
++, rel
++) {
880 if (rel
->r_offset
>= start_offset
&& rel
->r_offset
< start_offset
+ copy_size
) {
881 sym_name
= strtab
+ symtab
[ELF64_R_SYM(rel
->r_info
)].st_name
;
882 if (strstart(sym_name
, "__op_param", &p
)) {
883 snprintf(name
, sizeof(name
), "param%s", p
);
885 snprintf(name
, sizeof(name
), "(long)(&%s)", sym_name
);
887 type
= ELF64_R_TYPE(rel
->r_info
);
888 addend
= rel
->r_addend
;
891 error("must implemnt R_IA64_LTOFF22 relocation");
892 case R_IA64_PCREL21B
:
893 error("must implemnt R_IA64_PCREL21B relocation");
895 error("unsupported ia64 relocation (%d)", type
);
900 #elif defined(HOST_SPARC)
905 for(i
= 0, rel
= relocs
;i
< nb_relocs
; i
++, rel
++) {
906 if (rel
->r_offset
>= start_offset
&&
907 rel
->r_offset
< start_offset
+ copy_size
) {
908 sym_name
= strtab
+ symtab
[ELF32_R_SYM(rel
->r_info
)].st_name
;
909 if (strstart(sym_name
, "__op_param", &p
)) {
910 snprintf(name
, sizeof(name
), "param%s", p
);
912 if (sym_name
[0] == '.')
913 snprintf(name
, sizeof(name
),
917 snprintf(name
, sizeof(name
),
918 "(long)(&%s)", sym_name
);
920 type
= ELF32_R_TYPE(rel
->r_info
);
921 addend
= rel
->r_addend
;
924 fprintf(outfile
, " *(uint32_t *)(gen_code_ptr + %d) = %s + %d;\n",
925 rel
->r_offset
- start_offset
, name
, addend
);
929 " *(uint32_t *)(gen_code_ptr + %d) = "
930 "((*(uint32_t *)(gen_code_ptr + %d)) "
932 " | (((%s + %d) >> 10) & 0x3fffff);\n",
933 rel
->r_offset
- start_offset
,
934 rel
->r_offset
- start_offset
,
939 " *(uint32_t *)(gen_code_ptr + %d) = "
940 "((*(uint32_t *)(gen_code_ptr + %d)) "
942 " | ((%s + %d) & 0x3ff);\n",
943 rel
->r_offset
- start_offset
,
944 rel
->r_offset
- start_offset
,
947 case R_SPARC_WDISP30
:
949 " *(uint32_t *)(gen_code_ptr + %d) = "
950 "((*(uint32_t *)(gen_code_ptr + %d)) "
952 " | ((((%s + %d) - (long)(gen_code_ptr + %d))>>2) "
954 rel
->r_offset
- start_offset
,
955 rel
->r_offset
- start_offset
,
957 rel
->r_offset
- start_offset
);
960 error("unsupported sparc relocation (%d)", type
);
965 #elif defined(HOST_SPARC64)
970 for(i
= 0, rel
= relocs
;i
< nb_relocs
; i
++, rel
++) {
971 if (rel
->r_offset
>= start_offset
&&
972 rel
->r_offset
< start_offset
+ copy_size
) {
973 sym_name
= strtab
+ symtab
[ELF64_R_SYM(rel
->r_info
)].st_name
;
974 if (strstart(sym_name
, "__op_param", &p
)) {
975 snprintf(name
, sizeof(name
), "param%s", p
);
977 snprintf(name
, sizeof(name
), "(long)(&%s)", sym_name
);
979 type
= ELF64_R_TYPE(rel
->r_info
);
980 addend
= rel
->r_addend
;
983 fprintf(outfile
, " *(uint32_t *)(gen_code_ptr + %d) = %s + %d;\n",
984 rel
->r_offset
- start_offset
, name
, addend
);
988 " *(uint32_t *)(gen_code_ptr + %d) = "
989 "((*(uint32_t *)(gen_code_ptr + %d)) "
991 " | (((%s + %d) >> 10) & 0x3fffff);\n",
992 rel
->r_offset
- start_offset
,
993 rel
->r_offset
- start_offset
,
998 " *(uint32_t *)(gen_code_ptr + %d) = "
999 "((*(uint32_t *)(gen_code_ptr + %d)) "
1001 " | ((%s + %d) & 0x3ff);\n",
1002 rel
->r_offset
- start_offset
,
1003 rel
->r_offset
- start_offset
,
1006 case R_SPARC_WDISP30
:
1008 " *(uint32_t *)(gen_code_ptr + %d) = "
1009 "((*(uint32_t *)(gen_code_ptr + %d)) "
1011 " | ((((%s + %d) - (long)(gen_code_ptr + %d))>>2) "
1012 " & 0x3fffffff);\n",
1013 rel
->r_offset
- start_offset
,
1014 rel
->r_offset
- start_offset
,
1016 rel
->r_offset
- start_offset
);
1019 error("unsupported sparc64 relocation (%d)", type
);
1024 #elif defined(HOST_ARM)
1030 arm_emit_ldr_info(name
, start_offset
, outfile
, p_start
, p_end
,
1033 for(i
= 0, rel
= relocs
;i
< nb_relocs
; i
++, rel
++) {
1034 if (rel
->r_offset
>= start_offset
&&
1035 rel
->r_offset
< start_offset
+ copy_size
) {
1036 sym_name
= strtab
+ symtab
[ELFW(R_SYM
)(rel
->r_info
)].st_name
;
1037 /* the compiler leave some unnecessary references to the code */
1038 if (sym_name
[0] == '\0')
1040 if (strstart(sym_name
, "__op_param", &p
)) {
1041 snprintf(name
, sizeof(name
), "param%s", p
);
1043 snprintf(name
, sizeof(name
), "(long)(&%s)", sym_name
);
1045 type
= ELF32_R_TYPE(rel
->r_info
);
1046 addend
= get32((uint32_t *)(text
+ rel
->r_offset
));
1049 fprintf(outfile
, " *(uint32_t *)(gen_code_ptr + %d) = %s + %d;\n",
1050 rel
->r_offset
- start_offset
, name
, addend
);
1053 fprintf(outfile
, " arm_reloc_pc24((uint32_t *)(gen_code_ptr + %d), 0x%x, %s);\n",
1054 rel
->r_offset
- start_offset
, addend
, name
);
1057 error("unsupported arm relocation (%d)", type
);
1063 #error unsupported CPU
1065 fprintf(outfile
, " gen_code_ptr += %d;\n", copy_size
);
1066 fprintf(outfile
, "}\n");
1067 fprintf(outfile
, "break;\n\n");
1069 fprintf(outfile
, "static inline void gen_%s(", name
);
1071 fprintf(outfile
, "void");
1073 for(i
= 0; i
< nb_args
; i
++) {
1075 fprintf(outfile
, ", ");
1076 fprintf(outfile
, "long param%d", i
+ 1);
1079 fprintf(outfile
, ")\n");
1080 fprintf(outfile
, "{\n");
1081 for(i
= 0; i
< nb_args
; i
++) {
1082 fprintf(outfile
, " *gen_opparam_ptr++ = param%d;\n", i
+ 1);
1084 fprintf(outfile
, " *gen_opc_ptr++ = INDEX_%s;\n", name
);
1085 fprintf(outfile
, "}\n\n");
1089 /* load an elf object file */
1090 int load_elf(const char *filename
, FILE *outfile
, int do_print_enum
)
1093 struct elf_shdr
*sec
, *symtab_sec
, *strtab_sec
, *text_sec
;
1102 fd
= open(filename
, O_RDONLY
);
1104 error("can't open file '%s'", filename
);
1106 /* Read ELF header. */
1107 if (read(fd
, &ehdr
, sizeof (ehdr
)) != sizeof (ehdr
))
1108 error("unable to read file header");
1110 /* Check ELF identification. */
1111 if (ehdr
.e_ident
[EI_MAG0
] != ELFMAG0
1112 || ehdr
.e_ident
[EI_MAG1
] != ELFMAG1
1113 || ehdr
.e_ident
[EI_MAG2
] != ELFMAG2
1114 || ehdr
.e_ident
[EI_MAG3
] != ELFMAG3
1115 || ehdr
.e_ident
[EI_VERSION
] != EV_CURRENT
) {
1116 error("bad ELF header");
1119 do_swap
= elf_must_swap(&ehdr
);
1121 elf_swap_ehdr(&ehdr
);
1122 if (ehdr
.e_ident
[EI_CLASS
] != ELF_CLASS
)
1123 error("Unsupported ELF class");
1124 if (ehdr
.e_type
!= ET_REL
)
1125 error("ELF object file expected");
1126 if (ehdr
.e_version
!= EV_CURRENT
)
1127 error("Invalid ELF version");
1128 if (!elf_check_arch(ehdr
.e_machine
))
1129 error("Unsupported CPU (e_machine=%d)", ehdr
.e_machine
);
1131 /* read section headers */
1132 shdr
= load_data(fd
, ehdr
.e_shoff
, ehdr
.e_shnum
* sizeof(struct elf_shdr
));
1134 for(i
= 0; i
< ehdr
.e_shnum
; i
++) {
1135 elf_swap_shdr(&shdr
[i
]);
1139 /* read all section data */
1140 sdata
= malloc(sizeof(void *) * ehdr
.e_shnum
);
1141 memset(sdata
, 0, sizeof(void *) * ehdr
.e_shnum
);
1143 for(i
= 0;i
< ehdr
.e_shnum
; i
++) {
1145 if (sec
->sh_type
!= SHT_NOBITS
)
1146 sdata
[i
] = load_data(fd
, sec
->sh_offset
, sec
->sh_size
);
1149 sec
= &shdr
[ehdr
.e_shstrndx
];
1150 shstr
= sdata
[ehdr
.e_shstrndx
];
1152 /* swap relocations */
1153 for(i
= 0; i
< ehdr
.e_shnum
; i
++) {
1155 if (sec
->sh_type
== SHT_RELOC
) {
1156 nb_relocs
= sec
->sh_size
/ sec
->sh_entsize
;
1158 for(j
= 0, rel
= (ELF_RELOC
*)sdata
[i
]; j
< nb_relocs
; j
++, rel
++)
1165 text_sec
= find_elf_section(shdr
, ehdr
.e_shnum
, shstr
, ".text");
1167 error("could not find .text section");
1168 text_shndx
= text_sec
- shdr
;
1169 text
= sdata
[text_shndx
];
1171 /* find text relocations, if any */
1174 i
= find_reloc(text_shndx
);
1176 relocs
= (ELF_RELOC
*)sdata
[i
];
1177 nb_relocs
= shdr
[i
].sh_size
/ shdr
[i
].sh_entsize
;
1180 symtab_sec
= find_elf_section(shdr
, ehdr
.e_shnum
, shstr
, ".symtab");
1182 error("could not find .symtab section");
1183 strtab_sec
= &shdr
[symtab_sec
->sh_link
];
1185 symtab
= (ElfW(Sym
) *)sdata
[symtab_sec
- shdr
];
1186 strtab
= sdata
[symtab_sec
->sh_link
];
1188 nb_syms
= symtab_sec
->sh_size
/ sizeof(ElfW(Sym
));
1190 for(i
= 0, sym
= symtab
; i
< nb_syms
; i
++, sym
++) {
1191 swab32s(&sym
->st_name
);
1192 swabls(&sym
->st_value
);
1193 swabls(&sym
->st_size
);
1194 swab16s(&sym
->st_shndx
);
1198 if (do_print_enum
) {
1199 fprintf(outfile
, "DEF(end, 0, 0)\n");
1200 for(i
= 0, sym
= symtab
; i
< nb_syms
; i
++, sym
++) {
1201 const char *name
, *p
;
1202 name
= strtab
+ sym
->st_name
;
1203 if (strstart(name
, OP_PREFIX
, &p
)) {
1204 gen_code(name
, sym
->st_value
, sym
->st_size
, outfile
,
1205 text
, relocs
, nb_relocs
, 2);
1209 /* generate big code generation switch */
1212 "register int gp asm(\"$29\");\n"
1213 "static inline void immediate_ldah(void *p, int val) {\n"
1214 " uint32_t *dest = p;\n"
1215 " long high = ((val >> 16) + ((val >> 15) & 1)) & 0xffff;\n"
1217 " *dest &= ~0xffff;\n"
1219 " *dest |= 31 << 16;\n"
1221 "static inline void immediate_lda(void *dest, int val) {\n"
1222 " *(uint16_t *) dest = val;\n"
1224 "void fix_bsr(void *p, int offset) {\n"
1225 " uint32_t *dest = p;\n"
1226 " *dest &= ~((1 << 21) - 1);\n"
1227 " *dest |= (offset >> 2) & ((1 << 21) - 1);\n"
1231 "int dyngen_code(uint8_t *gen_code_buf,\n"
1232 " uint16_t *label_offsets, uint16_t *jmp_offsets,\n"
1233 " const uint16_t *opc_buf, const uint32_t *opparam_buf)\n"
1235 " uint8_t *gen_code_ptr;\n"
1236 " const uint16_t *opc_ptr;\n"
1237 " const uint32_t *opparam_ptr;\n");
1241 " uint8_t *last_gen_code_ptr = gen_code_buf;\n"
1242 " LDREntry *arm_ldr_ptr = arm_ldr_table;\n"
1243 " uint32_t *arm_data_ptr = arm_data_table;\n");
1248 " gen_code_ptr = gen_code_buf;\n"
1249 " opc_ptr = opc_buf;\n"
1250 " opparam_ptr = opparam_buf;\n");
1252 /* Generate prologue, if needed. */
1256 " switch(*opc_ptr++) {\n"
1259 for(i
= 0, sym
= symtab
; i
< nb_syms
; i
++, sym
++) {
1261 name
= strtab
+ sym
->st_name
;
1262 if (strstart(name
, OP_PREFIX
, NULL
)) {
1264 printf("%4d: %s pos=0x%08x len=%d\n",
1265 i
, name
, sym
->st_value
, sym
->st_size
);
1267 if (sym
->st_shndx
!= (text_sec
- shdr
))
1268 error("invalid section for opcode (0x%x)", sym
->st_shndx
);
1269 gen_code(name
, sym
->st_value
, sym
->st_size
, outfile
,
1270 text
, relocs
, nb_relocs
, 1);
1280 /* generate constant table if needed */
1282 " if ((gen_code_ptr - last_gen_code_ptr) >= (MAX_FRAG_SIZE - MAX_OP_SIZE)) {\n"
1283 " gen_code_ptr = arm_flush_ldr(gen_code_ptr, arm_ldr_table, arm_ldr_ptr, arm_data_table, arm_data_ptr, 1);\n"
1284 " last_gen_code_ptr = gen_code_ptr;\n"
1285 " arm_ldr_ptr = arm_ldr_table;\n"
1286 " arm_data_ptr = arm_data_table;\n"
1296 /* generate epilogue */
1299 fprintf(outfile
, "*gen_code_ptr++ = 0xc3; /* ret */\n");
1302 fprintf(outfile
, "*((uint32_t *)gen_code_ptr)++ = 0x4e800020; /* blr */\n");
1305 fprintf(outfile
, "*((uint16_t *)gen_code_ptr)++ = 0x07fe; /* br %%r14 */\n");
1308 fprintf(outfile
, "*((uint32_t *)gen_code_ptr)++ = 0x6bfa8001; /* ret */\n");
1311 fprintf(outfile
, "*((uint32_t *)gen_code_ptr)++ = 0x00840008; /* br.ret.sptk.many b0;; */\n");
1314 case EM_SPARC32PLUS
:
1315 fprintf(outfile
, "*((uint32_t *)gen_code_ptr)++ = 0x81c62008; /* jmpl %%i0 + 8, %%g0 */\n");
1316 fprintf(outfile
, "*((uint32_t *)gen_code_ptr)++ = 0x01000000; /* nop */\n");
1319 fprintf(outfile
, "*((uint32_t *)gen_code_ptr)++ = 0x81c7e008; /* ret */\n");
1320 fprintf(outfile
, "*((uint32_t *)gen_code_ptr)++ = 0x81e80000; /* restore */\n");
1323 fprintf(outfile
, "gen_code_ptr = arm_flush_ldr(gen_code_ptr, arm_ldr_table, arm_ldr_ptr, arm_data_table, arm_data_ptr, 0);\n");
1326 error("unknown ELF architecture");
1329 fprintf(outfile
, "return gen_code_ptr - gen_code_buf;\n");
1330 fprintf(outfile
, "}\n\n");
1332 /* generate gen_xxx functions */
1333 /* XXX: suppress the use of these functions to simplify code */
1334 for(i
= 0, sym
= symtab
; i
< nb_syms
; i
++, sym
++) {
1336 name
= strtab
+ sym
->st_name
;
1337 if (strstart(name
, OP_PREFIX
, NULL
)) {
1338 if (sym
->st_shndx
!= (text_sec
- shdr
))
1339 error("invalid section for opcode (0x%x)", sym
->st_shndx
);
1340 gen_code(name
, sym
->st_value
, sym
->st_size
, outfile
,
1341 text
, relocs
, nb_relocs
, 0);
1352 printf("dyngen (c) 2003 Fabrice Bellard\n"
1353 "usage: dyngen [-o outfile] [-c] objfile\n"
1354 "Generate a dynamic code generator from an object file\n"
1355 "-c output enum of operations\n"
1360 int main(int argc
, char **argv
)
1362 int c
, do_print_enum
;
1363 const char *filename
, *outfilename
;
1366 outfilename
= "out.c";
1369 c
= getopt(argc
, argv
, "ho:c");
1377 outfilename
= optarg
;
1386 filename
= argv
[optind
];
1387 outfile
= fopen(outfilename
, "w");
1389 error("could not open '%s'", outfilename
);
1390 load_elf(filename
, outfile
, do_print_enum
);