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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
111 #define NO_THUNK_TYPE_SIZE
120 /* all dynamically generated functions begin with this code */
121 #define OP_PREFIX "op_"
123 int elf_must_swap(struct elfhdr
*h
)
131 return (h
->e_ident
[EI_DATA
] == ELFDATA2MSB
) !=
132 (swaptest
.b
[0] == 0);
135 void swab16s(uint16_t *p
)
140 void swab32s(uint32_t *p
)
145 void swab64s(uint64_t *p
)
150 void elf_swap_ehdr(struct elfhdr
*h
)
152 swab16s(&h
->e_type
); /* Object file type */
153 swab16s(&h
-> e_machine
); /* Architecture */
154 swab32s(&h
-> e_version
); /* Object file version */
155 swabls(&h
-> e_entry
); /* Entry point virtual address */
156 swabls(&h
-> e_phoff
); /* Program header table file offset */
157 swabls(&h
-> e_shoff
); /* Section header table file offset */
158 swab32s(&h
-> e_flags
); /* Processor-specific flags */
159 swab16s(&h
-> e_ehsize
); /* ELF header size in bytes */
160 swab16s(&h
-> e_phentsize
); /* Program header table entry size */
161 swab16s(&h
-> e_phnum
); /* Program header table entry count */
162 swab16s(&h
-> e_shentsize
); /* Section header table entry size */
163 swab16s(&h
-> e_shnum
); /* Section header table entry count */
164 swab16s(&h
-> e_shstrndx
); /* Section header string table index */
167 void elf_swap_shdr(struct elf_shdr
*h
)
169 swab32s(&h
-> sh_name
); /* Section name (string tbl index) */
170 swab32s(&h
-> sh_type
); /* Section type */
171 swabls(&h
-> sh_flags
); /* Section flags */
172 swabls(&h
-> sh_addr
); /* Section virtual addr at execution */
173 swabls(&h
-> sh_offset
); /* Section file offset */
174 swabls(&h
-> sh_size
); /* Section size in bytes */
175 swab32s(&h
-> sh_link
); /* Link to another section */
176 swab32s(&h
-> sh_info
); /* Additional section information */
177 swabls(&h
-> sh_addralign
); /* Section alignment */
178 swabls(&h
-> sh_entsize
); /* Entry size if section holds table */
181 void elf_swap_phdr(struct elf_phdr
*h
)
183 swab32s(&h
->p_type
); /* Segment type */
184 swabls(&h
->p_offset
); /* Segment file offset */
185 swabls(&h
->p_vaddr
); /* Segment virtual address */
186 swabls(&h
->p_paddr
); /* Segment physical address */
187 swabls(&h
->p_filesz
); /* Segment size in file */
188 swabls(&h
->p_memsz
); /* Segment size in memory */
189 swab32s(&h
->p_flags
); /* Segment flags */
190 swabls(&h
->p_align
); /* Segment alignment */
193 void elf_swap_rel(ELF_RELOC
*rel
)
195 swabls(&rel
->r_offset
);
196 swabls(&rel
->r_info
);
197 #ifdef ELF_USES_RELOCA
198 swabls(&rel
->r_addend
);
204 struct elf_shdr
*shdr
;
212 uint16_t get16(uint16_t *p
)
221 uint32_t get32(uint32_t *p
)
230 void put16(uint16_t *p
, uint16_t val
)
237 void put32(uint32_t *p
, uint32_t val
)
244 void __attribute__((noreturn
)) __attribute__((format (printf
, 1, 2))) error(const char *fmt
, ...)
248 fprintf(stderr
, "dyngen: ");
249 vfprintf(stderr
, fmt
, ap
);
250 fprintf(stderr
, "\n");
256 struct elf_shdr
*find_elf_section(struct elf_shdr
*shdr
, int shnum
, const char *shstr
,
261 struct elf_shdr
*sec
;
263 for(i
= 0; i
< shnum
; i
++) {
267 shname
= shstr
+ sec
->sh_name
;
268 if (!strcmp(shname
, name
))
274 int find_reloc(int sh_index
)
276 struct elf_shdr
*sec
;
279 for(i
= 0; i
< ehdr
.e_shnum
; i
++) {
281 if (sec
->sh_type
== SHT_RELOC
&& sec
->sh_info
== sh_index
)
287 void *load_data(int fd
, long offset
, unsigned int size
)
294 lseek(fd
, offset
, SEEK_SET
);
295 if (read(fd
, data
, size
) != size
) {
302 int strstart(const char *str
, const char *val
, const char **ptr
)
320 int arm_emit_ldr_info(const char *name
, unsigned long start_offset
,
321 FILE *outfile
, uint8_t *p_start
, uint8_t *p_end
,
322 ELF_RELOC
*relocs
, int nb_relocs
)
326 int offset
, min_offset
, pc_offset
, data_size
;
327 uint8_t data_allocated
[1024];
328 unsigned int data_index
;
330 memset(data_allocated
, 0, sizeof(data_allocated
));
333 min_offset
= p_end
- p_start
;
334 while (p
< p_start
+ min_offset
) {
335 insn
= get32((uint32_t *)p
);
336 if ((insn
& 0x0d5f0000) == 0x051f0000) {
337 /* ldr reg, [pc, #im] */
338 offset
= insn
& 0xfff;
339 if (!(insn
& 0x00800000))
341 if ((offset
& 3) !=0)
342 error("%s:%04x: ldr pc offset must be 32 bit aligned",
343 name
, start_offset
+ p
- p_start
);
344 pc_offset
= p
- p_start
+ offset
+ 8;
345 if (pc_offset
<= (p
- p_start
) ||
346 pc_offset
>= (p_end
- p_start
))
347 error("%s:%04x: ldr pc offset must point inside the function code",
348 name
, start_offset
+ p
- p_start
);
349 if (pc_offset
< min_offset
)
350 min_offset
= pc_offset
;
353 fprintf(outfile
, " arm_ldr_ptr->ptr = gen_code_ptr + %d;\n",
356 data_index
= ((p_end
- p_start
) - pc_offset
- 4) >> 2;
357 fprintf(outfile
, " arm_ldr_ptr->data_ptr = arm_data_ptr + %d;\n",
359 fprintf(outfile
, " arm_ldr_ptr++;\n");
360 if (data_index
>= sizeof(data_allocated
))
361 error("%s: too many data", name
);
362 if (!data_allocated
[data_index
]) {
365 const char *sym_name
, *p
;
368 data_allocated
[data_index
] = 1;
371 addend
= get32((uint32_t *)(p_start
+ pc_offset
));
373 for(i
= 0, rel
= relocs
;i
< nb_relocs
; i
++, rel
++) {
374 if (rel
->r_offset
== (pc_offset
+ start_offset
)) {
375 sym_name
= strtab
+ symtab
[ELFW(R_SYM
)(rel
->r_info
)].st_name
;
376 /* the compiler leave some unnecessary references to the code */
377 if (strstart(sym_name
, "__op_param", &p
)) {
378 snprintf(relname
, sizeof(relname
), "param%s", p
);
380 snprintf(relname
, sizeof(relname
), "(long)(&%s)", sym_name
);
382 type
= ELF32_R_TYPE(rel
->r_info
);
383 if (type
!= R_ARM_ABS32
)
384 error("%s: unsupported data relocation", name
);
388 fprintf(outfile
, " arm_data_ptr[%d] = 0x%x",
390 if (relname
[0] != '\0')
391 fprintf(outfile
, " + %s", relname
);
392 fprintf(outfile
, ";\n");
398 data_size
= (p_end
- p_start
) - min_offset
;
399 if (data_size
> 0 && outfile
) {
400 fprintf(outfile
, " arm_data_ptr += %d;\n", data_size
>> 2);
403 /* the last instruction must be a mov pc, lr */
407 insn
= get32((uint32_t *)p
);
408 if ((insn
& 0xffff0000) != 0xe91b0000) {
411 printf("%s: invalid epilog\n", name
);
420 /* generate op code */
421 void gen_code(const char *name
, host_ulong offset
, host_ulong size
,
422 FILE *outfile
, uint8_t *text
, ELF_RELOC
*relocs
, int nb_relocs
,
426 uint8_t *p_start
, *p_end
;
427 host_ulong start_offset
;
429 uint8_t args_present
[MAX_ARGS
];
430 const char *sym_name
, *p
;
433 /* Compute exact size excluding prologue and epilogue instructions.
434 * Increment start_offset to skip epilogue instructions, then compute
435 * copy_size the indicate the size of the remaining instructions (in
438 p_start
= text
+ offset
;
439 p_end
= p_start
+ size
;
440 start_offset
= offset
;
445 len
= p_end
- p_start
;
447 error("empty code for %s", name
);
448 if (p_end
[-1] == 0xc3) {
451 error("ret or jmp expected at the end of %s", name
);
459 p
= (void *)(p_end
- 4);
461 error("empty code for %s", name
);
462 if (get32((uint32_t *)p
) != 0x4e800020)
463 error("blr expected at the end of %s", name
);
464 copy_size
= p
- p_start
;
470 p
= (void *)(p_end
- 2);
472 error("empty code for %s", name
);
473 if (get16((uint16_t *)p
) != 0x07fe && get16((uint16_t *)p
) != 0x07f4)
474 error("br %%r14 expected at the end of %s", name
);
475 copy_size
= p
- p_start
;
483 error("empty code for %s", name
);
484 if (get32((uint32_t *)p
) != 0x6bfa8001)
485 error("ret expected at the end of %s", name
);
486 copy_size
= p
- p_start
;
492 p
= (void *)(p_end
- 4);
494 error("empty code for %s", name
);
495 /* br.ret.sptk.many b0;; */
497 if (get32((uint32_t *)p
) != 0x00840008)
498 error("br.ret.sptk.many b0;; expected at the end of %s", name
);
499 copy_size
= p
- p_start
;
505 uint32_t start_insn
, end_insn1
, end_insn2
;
507 p
= (void *)(p_end
- 8);
509 error("empty code for %s", name
);
510 start_insn
= get32((uint32_t *)(p_start
+ 0x0));
511 end_insn1
= get32((uint32_t *)(p
+ 0x0));
512 end_insn2
= get32((uint32_t *)(p
+ 0x4));
513 if ((start_insn
& ~0x1fff) == 0x9de3a000) {
516 if ((int)(start_insn
| ~0x1fff) < -128)
517 error("Found bogus save at the start of %s", name
);
518 if (end_insn1
!= 0x81c7e008 || end_insn2
!= 0x81e80000)
519 error("ret; restore; not found at end of %s", name
);
521 error("No save at the beginning of %s", name
);
524 /* Skip a preceeding nop, if present. */
526 skip_insn
= get32((uint32_t *)(p
- 0x4));
527 if (skip_insn
== 0x01000000)
531 copy_size
= p
- p_start
;
536 uint32_t start_insn
, end_insn1
, end_insn2
, skip_insn
;
538 p
= (void *)(p_end
- 8);
540 error("empty code for %s", name
);
541 start_insn
= get32((uint32_t *)(p_start
+ 0x0));
542 end_insn1
= get32((uint32_t *)(p
+ 0x0));
543 end_insn2
= get32((uint32_t *)(p
+ 0x4));
544 if ((start_insn
& ~0x1fff) == 0x9de3a000) {
547 if ((int)(start_insn
| ~0x1fff) < -256)
548 error("Found bogus save at the start of %s", name
);
549 if (end_insn1
!= 0x81c7e008 || end_insn2
!= 0x81e80000)
550 error("ret; restore; not found at end of %s", name
);
552 error("No save at the beginning of %s", name
);
555 /* Skip a preceeding nop, if present. */
557 skip_insn
= get32((uint32_t *)(p
- 0x4));
558 if (skip_insn
== 0x01000000)
562 copy_size
= p
- p_start
;
567 if ((p_end
- p_start
) <= 16)
568 error("%s: function too small", name
);
569 if (get32((uint32_t *)p_start
) != 0xe1a0c00d ||
570 (get32((uint32_t *)(p_start
+ 4)) & 0xffff0000) != 0xe92d0000 ||
571 get32((uint32_t *)(p_start
+ 8)) != 0xe24cb004)
572 error("%s: invalid prolog", name
);
575 copy_size
= arm_emit_ldr_info(name
, start_offset
, NULL
, p_start
, p_end
,
580 error("unknown ELF architecture");
583 /* compute the number of arguments by looking at the relocations */
584 for(i
= 0;i
< MAX_ARGS
; i
++)
587 for(i
= 0, rel
= relocs
;i
< nb_relocs
; i
++, rel
++) {
588 if (rel
->r_offset
>= start_offset
&&
589 rel
->r_offset
< start_offset
+ (p_end
- p_start
)) {
590 sym_name
= strtab
+ symtab
[ELFW(R_SYM
)(rel
->r_info
)].st_name
;
591 if (strstart(sym_name
, "__op_param", &p
)) {
592 n
= strtoul(p
, NULL
, 10);
594 error("too many arguments in %s", name
);
595 args_present
[n
- 1] = 1;
601 while (nb_args
< MAX_ARGS
&& args_present
[nb_args
])
603 for(i
= nb_args
; i
< MAX_ARGS
; i
++) {
605 error("inconsistent argument numbering in %s", name
);
608 if (gen_switch
== 2) {
609 fprintf(outfile
, "DEF(%s, %d, %d)\n", name
+ 3, nb_args
, copy_size
);
610 } else if (gen_switch
== 1) {
613 fprintf(outfile
, "case INDEX_%s: {\n", name
);
615 fprintf(outfile
, " long ");
616 for(i
= 0; i
< nb_args
; i
++) {
618 fprintf(outfile
, ", ");
619 fprintf(outfile
, "param%d", i
+ 1);
621 fprintf(outfile
, ";\n");
623 fprintf(outfile
, " extern void %s();\n", name
);
625 for(i
= 0, rel
= relocs
;i
< nb_relocs
; i
++, rel
++) {
626 if (rel
->r_offset
>= start_offset
&&
627 rel
->r_offset
< start_offset
+ (p_end
- p_start
)) {
628 sym_name
= strtab
+ symtab
[ELFW(R_SYM
)(rel
->r_info
)].st_name
;
630 !strstart(sym_name
, "__op_param", NULL
) &&
631 !strstart(sym_name
, "__op_jmp", NULL
)) {
632 #if defined(HOST_SPARC)
633 if (sym_name
[0] == '.') {
635 "extern char __dot_%s __asm__(\"%s\");\n",
636 sym_name
+1, sym_name
);
640 fprintf(outfile
, "extern char %s;\n", sym_name
);
645 fprintf(outfile
, " memcpy(gen_code_ptr, (void *)((char *)&%s+%d), %d);\n", name
, start_offset
- offset
, copy_size
);
647 /* emit code offset information */
650 const char *sym_name
, *p
;
654 for(i
= 0, sym
= symtab
; i
< nb_syms
; i
++, sym
++) {
655 sym_name
= strtab
+ sym
->st_name
;
656 if (strstart(sym_name
, "__op_label", &p
)) {
658 unsigned long offset
;
660 /* test if the variable refers to a label inside
661 the code we are generating */
662 ptr
= sdata
[sym
->st_shndx
];
664 error("__op_labelN in invalid section");
665 offset
= sym
->st_value
;
666 val
= *(target_ulong
*)(ptr
+ offset
);
667 #ifdef ELF_USES_RELOCA
669 int reloc_shndx
, nb_relocs1
, j
;
671 /* try to find a matching relocation */
672 reloc_shndx
= find_reloc(sym
->st_shndx
);
674 nb_relocs1
= shdr
[reloc_shndx
].sh_size
/
675 shdr
[reloc_shndx
].sh_entsize
;
676 rel
= (ELF_RELOC
*)sdata
[reloc_shndx
];
677 for(j
= 0; j
< nb_relocs1
; j
++) {
678 if (rel
->r_offset
== offset
) {
688 if (val
>= start_offset
&& val
< start_offset
+ copy_size
) {
689 n
= strtol(p
, NULL
, 10);
690 fprintf(outfile
, " label_offsets[%d] = %d + (gen_code_ptr - gen_code_buf);\n", n
, val
- start_offset
);
696 /* load parameres in variables */
697 for(i
= 0; i
< nb_args
; i
++) {
698 fprintf(outfile
, " param%d = *opparam_ptr++;\n", i
+ 1);
701 /* patch relocations */
702 #if defined(HOST_I386)
707 for(i
= 0, rel
= relocs
;i
< nb_relocs
; i
++, rel
++) {
708 if (rel
->r_offset
>= start_offset
&&
709 rel
->r_offset
< start_offset
+ copy_size
) {
710 sym_name
= strtab
+ symtab
[ELFW(R_SYM
)(rel
->r_info
)].st_name
;
711 if (strstart(sym_name
, "__op_param", &p
)) {
712 snprintf(name
, sizeof(name
), "param%s", p
);
714 snprintf(name
, sizeof(name
), "(long)(&%s)", sym_name
);
716 type
= ELF32_R_TYPE(rel
->r_info
);
717 addend
= get32((uint32_t *)(text
+ rel
->r_offset
));
720 fprintf(outfile
, " *(uint32_t *)(gen_code_ptr + %d) = %s + %d;\n",
721 rel
->r_offset
- start_offset
, name
, addend
);
724 fprintf(outfile
, " *(uint32_t *)(gen_code_ptr + %d) = %s - (long)(gen_code_ptr + %d) + %d;\n",
725 rel
->r_offset
- start_offset
, name
, rel
->r_offset
- start_offset
, addend
);
728 error("unsupported i386 relocation (%d)", type
);
733 #elif defined(HOST_PPC)
738 for(i
= 0, rel
= relocs
;i
< nb_relocs
; i
++, rel
++) {
739 if (rel
->r_offset
>= start_offset
&&
740 rel
->r_offset
< start_offset
+ copy_size
) {
741 sym_name
= strtab
+ symtab
[ELFW(R_SYM
)(rel
->r_info
)].st_name
;
742 if (strstart(sym_name
, "__op_jmp", &p
)) {
744 n
= strtol(p
, NULL
, 10);
745 /* __op_jmp relocations are done at
746 runtime to do translated block
747 chaining: the offset of the instruction
748 needs to be stored */
749 fprintf(outfile
, " jmp_offsets[%d] = %d + (gen_code_ptr - gen_code_buf);\n",
750 n
, rel
->r_offset
- start_offset
);
754 if (strstart(sym_name
, "__op_param", &p
)) {
755 snprintf(name
, sizeof(name
), "param%s", p
);
757 snprintf(name
, sizeof(name
), "(long)(&%s)", sym_name
);
759 type
= ELF32_R_TYPE(rel
->r_info
);
760 addend
= rel
->r_addend
;
763 fprintf(outfile
, " *(uint32_t *)(gen_code_ptr + %d) = %s + %d;\n",
764 rel
->r_offset
- start_offset
, name
, addend
);
766 case R_PPC_ADDR16_LO
:
767 fprintf(outfile
, " *(uint16_t *)(gen_code_ptr + %d) = (%s + %d);\n",
768 rel
->r_offset
- start_offset
, name
, addend
);
770 case R_PPC_ADDR16_HI
:
771 fprintf(outfile
, " *(uint16_t *)(gen_code_ptr + %d) = (%s + %d) >> 16;\n",
772 rel
->r_offset
- start_offset
, name
, addend
);
774 case R_PPC_ADDR16_HA
:
775 fprintf(outfile
, " *(uint16_t *)(gen_code_ptr + %d) = (%s + %d + 0x8000) >> 16;\n",
776 rel
->r_offset
- start_offset
, name
, addend
);
779 /* warning: must be at 32 MB distancy */
780 fprintf(outfile
, " *(uint32_t *)(gen_code_ptr + %d) = (*(uint32_t *)(gen_code_ptr + %d) & ~0x03fffffc) | ((%s - (long)(gen_code_ptr + %d) + %d) & 0x03fffffc);\n",
781 rel
->r_offset
- start_offset
, rel
->r_offset
- start_offset
, name
, rel
->r_offset
- start_offset
, addend
);
784 error("unsupported powerpc relocation (%d)", type
);
789 #elif defined(HOST_S390)
794 for(i
= 0, rel
= relocs
;i
< nb_relocs
; i
++, rel
++) {
795 if (rel
->r_offset
>= start_offset
&&
796 rel
->r_offset
< start_offset
+ copy_size
) {
797 sym_name
= strtab
+ symtab
[ELFW(R_SYM
)(rel
->r_info
)].st_name
;
798 if (strstart(sym_name
, "__op_param", &p
)) {
799 snprintf(name
, sizeof(name
), "param%s", p
);
801 snprintf(name
, sizeof(name
), "(long)(&%s)", sym_name
);
803 type
= ELF32_R_TYPE(rel
->r_info
);
804 addend
= rel
->r_addend
;
807 fprintf(outfile
, " *(uint32_t *)(gen_code_ptr + %d) = %s + %d;\n",
808 rel
->r_offset
- start_offset
, name
, addend
);
811 fprintf(outfile
, " *(uint16_t *)(gen_code_ptr + %d) = %s + %d;\n",
812 rel
->r_offset
- start_offset
, name
, addend
);
815 fprintf(outfile
, " *(uint8_t *)(gen_code_ptr + %d) = %s + %d;\n",
816 rel
->r_offset
- start_offset
, name
, addend
);
819 error("unsupported s390 relocation (%d)", type
);
824 #elif defined(HOST_ALPHA)
826 for (i
= 0, rel
= relocs
; i
< nb_relocs
; i
++, rel
++) {
827 if (rel
->r_offset
>= start_offset
&& rel
->r_offset
< start_offset
+ copy_size
) {
830 type
= ELF64_R_TYPE(rel
->r_info
);
831 sym_name
= strtab
+ symtab
[ELF64_R_SYM(rel
->r_info
)].st_name
;
834 /* The gp is just 32 bit, and never changes, so it's easiest to emit it
835 as an immediate instead of constructing it from the pv or ra. */
836 fprintf(outfile
, " immediate_ldah(gen_code_ptr + %ld, gp);\n",
837 rel
->r_offset
- start_offset
);
838 fprintf(outfile
, " immediate_lda(gen_code_ptr + %ld, gp);\n",
839 rel
->r_offset
- start_offset
+ rel
->r_addend
);
842 /* jsr to literal hint. Could be used to optimize to bsr. Ignore for
843 now, since some called functions (libc) need pv to be set up. */
846 /* Branch target prediction hint. Ignore for now. Should be already
847 correct for in-function jumps. */
849 case R_ALPHA_LITERAL
:
850 /* Load a literal from the GOT relative to the gp. Since there's only a
851 single gp, nothing is to be done. */
853 case R_ALPHA_GPRELHIGH
:
854 /* Handle fake relocations against __op_param symbol. Need to emit the
855 high part of the immediate value instead. Other symbols need no
856 special treatment. */
857 if (strstart(sym_name
, "__op_param", &p
))
858 fprintf(outfile
, " immediate_ldah(gen_code_ptr + %ld, param%s);\n",
859 rel
->r_offset
- start_offset
, p
);
861 case R_ALPHA_GPRELLOW
:
862 if (strstart(sym_name
, "__op_param", &p
))
863 fprintf(outfile
, " immediate_lda(gen_code_ptr + %ld, param%s);\n",
864 rel
->r_offset
- start_offset
, p
);
867 /* PC-relative jump. Tweak offset to skip the two instructions that try to
868 set up the gp from the pv. */
869 fprintf(outfile
, " fix_bsr(gen_code_ptr + %ld, (uint8_t *) &%s - (gen_code_ptr + %ld + 4) + 8);\n",
870 rel
->r_offset
- start_offset
, sym_name
, rel
->r_offset
- start_offset
);
873 error("unsupported Alpha relocation (%d)", type
);
878 #elif defined(HOST_IA64)
883 for(i
= 0, rel
= relocs
;i
< nb_relocs
; i
++, rel
++) {
884 if (rel
->r_offset
>= start_offset
&& rel
->r_offset
< start_offset
+ copy_size
) {
885 sym_name
= strtab
+ symtab
[ELF64_R_SYM(rel
->r_info
)].st_name
;
886 if (strstart(sym_name
, "__op_param", &p
)) {
887 snprintf(name
, sizeof(name
), "param%s", p
);
889 snprintf(name
, sizeof(name
), "(long)(&%s)", sym_name
);
891 type
= ELF64_R_TYPE(rel
->r_info
);
892 addend
= rel
->r_addend
;
895 error("must implemnt R_IA64_LTOFF22 relocation");
896 case R_IA64_PCREL21B
:
897 error("must implemnt R_IA64_PCREL21B relocation");
899 error("unsupported ia64 relocation (%d)", type
);
904 #elif defined(HOST_SPARC)
909 for(i
= 0, rel
= relocs
;i
< nb_relocs
; i
++, rel
++) {
910 if (rel
->r_offset
>= start_offset
&&
911 rel
->r_offset
< start_offset
+ copy_size
) {
912 sym_name
= strtab
+ symtab
[ELF32_R_SYM(rel
->r_info
)].st_name
;
913 if (strstart(sym_name
, "__op_param", &p
)) {
914 snprintf(name
, sizeof(name
), "param%s", p
);
916 if (sym_name
[0] == '.')
917 snprintf(name
, sizeof(name
),
921 snprintf(name
, sizeof(name
),
922 "(long)(&%s)", sym_name
);
924 type
= ELF32_R_TYPE(rel
->r_info
);
925 addend
= rel
->r_addend
;
928 fprintf(outfile
, " *(uint32_t *)(gen_code_ptr + %d) = %s + %d;\n",
929 rel
->r_offset
- start_offset
, name
, addend
);
933 " *(uint32_t *)(gen_code_ptr + %d) = "
934 "((*(uint32_t *)(gen_code_ptr + %d)) "
936 " | (((%s + %d) >> 10) & 0x3fffff);\n",
937 rel
->r_offset
- start_offset
,
938 rel
->r_offset
- start_offset
,
943 " *(uint32_t *)(gen_code_ptr + %d) = "
944 "((*(uint32_t *)(gen_code_ptr + %d)) "
946 " | ((%s + %d) & 0x3ff);\n",
947 rel
->r_offset
- start_offset
,
948 rel
->r_offset
- start_offset
,
951 case R_SPARC_WDISP30
:
953 " *(uint32_t *)(gen_code_ptr + %d) = "
954 "((*(uint32_t *)(gen_code_ptr + %d)) "
956 " | ((((%s + %d) - (long)(gen_code_ptr + %d))>>2) "
958 rel
->r_offset
- start_offset
,
959 rel
->r_offset
- start_offset
,
961 rel
->r_offset
- start_offset
);
964 error("unsupported sparc relocation (%d)", type
);
969 #elif defined(HOST_SPARC64)
974 for(i
= 0, rel
= relocs
;i
< nb_relocs
; i
++, rel
++) {
975 if (rel
->r_offset
>= start_offset
&&
976 rel
->r_offset
< start_offset
+ copy_size
) {
977 sym_name
= strtab
+ symtab
[ELF64_R_SYM(rel
->r_info
)].st_name
;
978 if (strstart(sym_name
, "__op_param", &p
)) {
979 snprintf(name
, sizeof(name
), "param%s", p
);
981 snprintf(name
, sizeof(name
), "(long)(&%s)", sym_name
);
983 type
= ELF64_R_TYPE(rel
->r_info
);
984 addend
= rel
->r_addend
;
987 fprintf(outfile
, " *(uint32_t *)(gen_code_ptr + %d) = %s + %d;\n",
988 rel
->r_offset
- start_offset
, name
, addend
);
992 " *(uint32_t *)(gen_code_ptr + %d) = "
993 "((*(uint32_t *)(gen_code_ptr + %d)) "
995 " | (((%s + %d) >> 10) & 0x3fffff);\n",
996 rel
->r_offset
- start_offset
,
997 rel
->r_offset
- start_offset
,
1002 " *(uint32_t *)(gen_code_ptr + %d) = "
1003 "((*(uint32_t *)(gen_code_ptr + %d)) "
1005 " | ((%s + %d) & 0x3ff);\n",
1006 rel
->r_offset
- start_offset
,
1007 rel
->r_offset
- start_offset
,
1010 case R_SPARC_WDISP30
:
1012 " *(uint32_t *)(gen_code_ptr + %d) = "
1013 "((*(uint32_t *)(gen_code_ptr + %d)) "
1015 " | ((((%s + %d) - (long)(gen_code_ptr + %d))>>2) "
1016 " & 0x3fffffff);\n",
1017 rel
->r_offset
- start_offset
,
1018 rel
->r_offset
- start_offset
,
1020 rel
->r_offset
- start_offset
);
1023 error("unsupported sparc64 relocation (%d)", type
);
1028 #elif defined(HOST_ARM)
1034 arm_emit_ldr_info(name
, start_offset
, outfile
, p_start
, p_end
,
1037 for(i
= 0, rel
= relocs
;i
< nb_relocs
; i
++, rel
++) {
1038 if (rel
->r_offset
>= start_offset
&&
1039 rel
->r_offset
< start_offset
+ copy_size
) {
1040 sym_name
= strtab
+ symtab
[ELFW(R_SYM
)(rel
->r_info
)].st_name
;
1041 /* the compiler leave some unnecessary references to the code */
1042 if (sym_name
[0] == '\0')
1044 if (strstart(sym_name
, "__op_param", &p
)) {
1045 snprintf(name
, sizeof(name
), "param%s", p
);
1047 snprintf(name
, sizeof(name
), "(long)(&%s)", sym_name
);
1049 type
= ELF32_R_TYPE(rel
->r_info
);
1050 addend
= get32((uint32_t *)(text
+ rel
->r_offset
));
1053 fprintf(outfile
, " *(uint32_t *)(gen_code_ptr + %d) = %s + %d;\n",
1054 rel
->r_offset
- start_offset
, name
, addend
);
1057 fprintf(outfile
, " arm_reloc_pc24((uint32_t *)(gen_code_ptr + %d), 0x%x, %s);\n",
1058 rel
->r_offset
- start_offset
, addend
, name
);
1061 error("unsupported arm relocation (%d)", type
);
1067 #error unsupported CPU
1069 fprintf(outfile
, " gen_code_ptr += %d;\n", copy_size
);
1070 fprintf(outfile
, "}\n");
1071 fprintf(outfile
, "break;\n\n");
1073 fprintf(outfile
, "static inline void gen_%s(", name
);
1075 fprintf(outfile
, "void");
1077 for(i
= 0; i
< nb_args
; i
++) {
1079 fprintf(outfile
, ", ");
1080 fprintf(outfile
, "long param%d", i
+ 1);
1083 fprintf(outfile
, ")\n");
1084 fprintf(outfile
, "{\n");
1085 for(i
= 0; i
< nb_args
; i
++) {
1086 fprintf(outfile
, " *gen_opparam_ptr++ = param%d;\n", i
+ 1);
1088 fprintf(outfile
, " *gen_opc_ptr++ = INDEX_%s;\n", name
);
1089 fprintf(outfile
, "}\n\n");
1093 /* load an elf object file */
1094 int load_elf(const char *filename
, FILE *outfile
, int out_type
)
1097 struct elf_shdr
*sec
, *symtab_sec
, *strtab_sec
, *text_sec
;
1106 fd
= open(filename
, O_RDONLY
);
1108 error("can't open file '%s'", filename
);
1110 /* Read ELF header. */
1111 if (read(fd
, &ehdr
, sizeof (ehdr
)) != sizeof (ehdr
))
1112 error("unable to read file header");
1114 /* Check ELF identification. */
1115 if (ehdr
.e_ident
[EI_MAG0
] != ELFMAG0
1116 || ehdr
.e_ident
[EI_MAG1
] != ELFMAG1
1117 || ehdr
.e_ident
[EI_MAG2
] != ELFMAG2
1118 || ehdr
.e_ident
[EI_MAG3
] != ELFMAG3
1119 || ehdr
.e_ident
[EI_VERSION
] != EV_CURRENT
) {
1120 error("bad ELF header");
1123 do_swap
= elf_must_swap(&ehdr
);
1125 elf_swap_ehdr(&ehdr
);
1126 if (ehdr
.e_ident
[EI_CLASS
] != ELF_CLASS
)
1127 error("Unsupported ELF class");
1128 if (ehdr
.e_type
!= ET_REL
)
1129 error("ELF object file expected");
1130 if (ehdr
.e_version
!= EV_CURRENT
)
1131 error("Invalid ELF version");
1132 if (!elf_check_arch(ehdr
.e_machine
))
1133 error("Unsupported CPU (e_machine=%d)", ehdr
.e_machine
);
1135 /* read section headers */
1136 shdr
= load_data(fd
, ehdr
.e_shoff
, ehdr
.e_shnum
* sizeof(struct elf_shdr
));
1138 for(i
= 0; i
< ehdr
.e_shnum
; i
++) {
1139 elf_swap_shdr(&shdr
[i
]);
1143 /* read all section data */
1144 sdata
= malloc(sizeof(void *) * ehdr
.e_shnum
);
1145 memset(sdata
, 0, sizeof(void *) * ehdr
.e_shnum
);
1147 for(i
= 0;i
< ehdr
.e_shnum
; i
++) {
1149 if (sec
->sh_type
!= SHT_NOBITS
)
1150 sdata
[i
] = load_data(fd
, sec
->sh_offset
, sec
->sh_size
);
1153 sec
= &shdr
[ehdr
.e_shstrndx
];
1154 shstr
= sdata
[ehdr
.e_shstrndx
];
1156 /* swap relocations */
1157 for(i
= 0; i
< ehdr
.e_shnum
; i
++) {
1159 if (sec
->sh_type
== SHT_RELOC
) {
1160 nb_relocs
= sec
->sh_size
/ sec
->sh_entsize
;
1162 for(j
= 0, rel
= (ELF_RELOC
*)sdata
[i
]; j
< nb_relocs
; j
++, rel
++)
1169 text_sec
= find_elf_section(shdr
, ehdr
.e_shnum
, shstr
, ".text");
1171 error("could not find .text section");
1172 text_shndx
= text_sec
- shdr
;
1173 text
= sdata
[text_shndx
];
1175 /* find text relocations, if any */
1178 i
= find_reloc(text_shndx
);
1180 relocs
= (ELF_RELOC
*)sdata
[i
];
1181 nb_relocs
= shdr
[i
].sh_size
/ shdr
[i
].sh_entsize
;
1184 symtab_sec
= find_elf_section(shdr
, ehdr
.e_shnum
, shstr
, ".symtab");
1186 error("could not find .symtab section");
1187 strtab_sec
= &shdr
[symtab_sec
->sh_link
];
1189 symtab
= (ElfW(Sym
) *)sdata
[symtab_sec
- shdr
];
1190 strtab
= sdata
[symtab_sec
->sh_link
];
1192 nb_syms
= symtab_sec
->sh_size
/ sizeof(ElfW(Sym
));
1194 for(i
= 0, sym
= symtab
; i
< nb_syms
; i
++, sym
++) {
1195 swab32s(&sym
->st_name
);
1196 swabls(&sym
->st_value
);
1197 swabls(&sym
->st_size
);
1198 swab16s(&sym
->st_shndx
);
1202 if (out_type
== OUT_INDEX_OP
) {
1203 fprintf(outfile
, "DEF(end, 0, 0)\n");
1204 for(i
= 0, sym
= symtab
; i
< nb_syms
; i
++, sym
++) {
1205 const char *name
, *p
;
1206 name
= strtab
+ sym
->st_name
;
1207 if (strstart(name
, OP_PREFIX
, &p
)) {
1208 gen_code(name
, sym
->st_value
, sym
->st_size
, outfile
,
1209 text
, relocs
, nb_relocs
, 2);
1212 } else if (out_type
== OUT_GEN_OP
) {
1213 /* generate gen_xxx functions */
1215 for(i
= 0, sym
= symtab
; i
< nb_syms
; i
++, sym
++) {
1217 name
= strtab
+ sym
->st_name
;
1218 if (strstart(name
, OP_PREFIX
, NULL
)) {
1219 if (sym
->st_shndx
!= (text_sec
- shdr
))
1220 error("invalid section for opcode (0x%x)", sym
->st_shndx
);
1221 gen_code(name
, sym
->st_value
, sym
->st_size
, outfile
,
1222 text
, relocs
, nb_relocs
, 0);
1227 /* generate big code generation switch */
1229 "int dyngen_code(uint8_t *gen_code_buf,\n"
1230 " uint16_t *label_offsets, uint16_t *jmp_offsets,\n"
1231 " const uint16_t *opc_buf, const uint32_t *opparam_buf)\n"
1233 " uint8_t *gen_code_ptr;\n"
1234 " const uint16_t *opc_ptr;\n"
1235 " const uint32_t *opparam_ptr;\n");
1239 " uint8_t *last_gen_code_ptr = gen_code_buf;\n"
1240 " LDREntry *arm_ldr_ptr = arm_ldr_table;\n"
1241 " uint32_t *arm_data_ptr = arm_data_table;\n");
1246 " gen_code_ptr = gen_code_buf;\n"
1247 " opc_ptr = opc_buf;\n"
1248 " opparam_ptr = opparam_buf;\n");
1250 /* Generate prologue, if needed. */
1254 " switch(*opc_ptr++) {\n"
1257 for(i
= 0, sym
= symtab
; i
< nb_syms
; i
++, sym
++) {
1259 name
= strtab
+ sym
->st_name
;
1260 if (strstart(name
, OP_PREFIX
, NULL
)) {
1262 printf("%4d: %s pos=0x%08x len=%d\n",
1263 i
, name
, sym
->st_value
, sym
->st_size
);
1265 if (sym
->st_shndx
!= (text_sec
- shdr
))
1266 error("invalid section for opcode (0x%x)", sym
->st_shndx
);
1267 gen_code(name
, sym
->st_value
, sym
->st_size
, outfile
,
1268 text
, relocs
, nb_relocs
, 1);
1278 /* generate constant table if needed */
1280 " if ((gen_code_ptr - last_gen_code_ptr) >= (MAX_FRAG_SIZE - MAX_OP_SIZE)) {\n"
1281 " gen_code_ptr = arm_flush_ldr(gen_code_ptr, arm_ldr_table, arm_ldr_ptr, arm_data_table, arm_data_ptr, 1);\n"
1282 " last_gen_code_ptr = gen_code_ptr;\n"
1283 " arm_ldr_ptr = arm_ldr_table;\n"
1284 " arm_data_ptr = arm_data_table;\n"
1294 /* generate epilogue */
1297 fprintf(outfile
, "*gen_code_ptr++ = 0xc3; /* ret */\n");
1300 fprintf(outfile
, "*((uint32_t *)gen_code_ptr)++ = 0x4e800020; /* blr */\n");
1303 fprintf(outfile
, "*((uint16_t *)gen_code_ptr)++ = 0x07fe; /* br %%r14 */\n");
1306 fprintf(outfile
, "*((uint32_t *)gen_code_ptr)++ = 0x6bfa8001; /* ret */\n");
1309 fprintf(outfile
, "*((uint32_t *)gen_code_ptr)++ = 0x00840008; /* br.ret.sptk.many b0;; */\n");
1312 case EM_SPARC32PLUS
:
1313 fprintf(outfile
, "*((uint32_t *)gen_code_ptr)++ = 0x81c62008; /* jmpl %%i0 + 8, %%g0 */\n");
1314 fprintf(outfile
, "*((uint32_t *)gen_code_ptr)++ = 0x01000000; /* nop */\n");
1317 fprintf(outfile
, "*((uint32_t *)gen_code_ptr)++ = 0x81c7e008; /* ret */\n");
1318 fprintf(outfile
, "*((uint32_t *)gen_code_ptr)++ = 0x81e80000; /* restore */\n");
1321 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");
1324 error("unknown ELF architecture");
1326 /* flush instruction cache */
1327 fprintf(outfile
, "flush_icache_range((unsigned long)gen_code_buf, (unsigned long)gen_code_ptr);\n");
1329 fprintf(outfile
, "return gen_code_ptr - gen_code_buf;\n");
1330 fprintf(outfile
, "}\n\n");
1340 printf("dyngen (c) 2003 Fabrice Bellard\n"
1341 "usage: dyngen [-o outfile] [-c] objfile\n"
1342 "Generate a dynamic code generator from an object file\n"
1343 "-c output enum of operations\n"
1344 "-g output gen_op_xx() functions\n"
1349 int main(int argc
, char **argv
)
1352 const char *filename
, *outfilename
;
1355 outfilename
= "out.c";
1356 out_type
= OUT_CODE
;
1358 c
= getopt(argc
, argv
, "ho:cg");
1366 outfilename
= optarg
;
1369 out_type
= OUT_INDEX_OP
;
1372 out_type
= OUT_GEN_OP
;
1378 filename
= argv
[optind
];
1379 outfile
= fopen(outfilename
, "w");
1381 error("could not open '%s'", outfilename
);
1382 load_elf(filename
, outfile
, out_type
);