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git.proxmox.com Git - qemu.git/blob - dyngen.c
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.
28 #include "config-host.h"
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
89 #elif defined(HOST_M68K)
91 #define ELF_CLASS ELFCLASS32
92 #define ELF_ARCH EM_68K
93 #define elf_check_arch(x) ((x) == EM_68K)
94 #define ELF_USES_RELOCA
97 #error unsupported CPU - please update the code
102 #if ELF_CLASS == ELFCLASS32
103 typedef int32_t host_long
;
104 typedef uint32_t host_ulong
;
105 #define swabls(x) swab32s(x)
107 typedef int64_t host_long
;
108 typedef uint64_t host_ulong
;
109 #define swabls(x) swab64s(x)
112 #ifdef ELF_USES_RELOCA
113 #define SHT_RELOC SHT_RELA
115 #define SHT_RELOC SHT_REL
126 /* all dynamically generated functions begin with this code */
127 #define OP_PREFIX "op_"
129 int elf_must_swap(struct elfhdr
*h
)
137 return (h
->e_ident
[EI_DATA
] == ELFDATA2MSB
) !=
138 (swaptest
.b
[0] == 0);
141 void swab16s(uint16_t *p
)
146 void swab32s(uint32_t *p
)
151 void swab64s(uint64_t *p
)
156 void elf_swap_ehdr(struct elfhdr
*h
)
158 swab16s(&h
->e_type
); /* Object file type */
159 swab16s(&h
-> e_machine
); /* Architecture */
160 swab32s(&h
-> e_version
); /* Object file version */
161 swabls(&h
-> e_entry
); /* Entry point virtual address */
162 swabls(&h
-> e_phoff
); /* Program header table file offset */
163 swabls(&h
-> e_shoff
); /* Section header table file offset */
164 swab32s(&h
-> e_flags
); /* Processor-specific flags */
165 swab16s(&h
-> e_ehsize
); /* ELF header size in bytes */
166 swab16s(&h
-> e_phentsize
); /* Program header table entry size */
167 swab16s(&h
-> e_phnum
); /* Program header table entry count */
168 swab16s(&h
-> e_shentsize
); /* Section header table entry size */
169 swab16s(&h
-> e_shnum
); /* Section header table entry count */
170 swab16s(&h
-> e_shstrndx
); /* Section header string table index */
173 void elf_swap_shdr(struct elf_shdr
*h
)
175 swab32s(&h
-> sh_name
); /* Section name (string tbl index) */
176 swab32s(&h
-> sh_type
); /* Section type */
177 swabls(&h
-> sh_flags
); /* Section flags */
178 swabls(&h
-> sh_addr
); /* Section virtual addr at execution */
179 swabls(&h
-> sh_offset
); /* Section file offset */
180 swabls(&h
-> sh_size
); /* Section size in bytes */
181 swab32s(&h
-> sh_link
); /* Link to another section */
182 swab32s(&h
-> sh_info
); /* Additional section information */
183 swabls(&h
-> sh_addralign
); /* Section alignment */
184 swabls(&h
-> sh_entsize
); /* Entry size if section holds table */
187 void elf_swap_phdr(struct elf_phdr
*h
)
189 swab32s(&h
->p_type
); /* Segment type */
190 swabls(&h
->p_offset
); /* Segment file offset */
191 swabls(&h
->p_vaddr
); /* Segment virtual address */
192 swabls(&h
->p_paddr
); /* Segment physical address */
193 swabls(&h
->p_filesz
); /* Segment size in file */
194 swabls(&h
->p_memsz
); /* Segment size in memory */
195 swab32s(&h
->p_flags
); /* Segment flags */
196 swabls(&h
->p_align
); /* Segment alignment */
199 void elf_swap_rel(ELF_RELOC
*rel
)
201 swabls(&rel
->r_offset
);
202 swabls(&rel
->r_info
);
203 #ifdef ELF_USES_RELOCA
204 swabls(&rel
->r_addend
);
210 struct elf_shdr
*shdr
;
218 uint16_t get16(uint16_t *p
)
227 uint32_t get32(uint32_t *p
)
236 void put16(uint16_t *p
, uint16_t val
)
243 void put32(uint32_t *p
, uint32_t val
)
250 void __attribute__((noreturn
)) __attribute__((format (printf
, 1, 2))) error(const char *fmt
, ...)
254 fprintf(stderr
, "dyngen: ");
255 vfprintf(stderr
, fmt
, ap
);
256 fprintf(stderr
, "\n");
262 struct elf_shdr
*find_elf_section(struct elf_shdr
*shdr
, int shnum
, const char *shstr
,
267 struct elf_shdr
*sec
;
269 for(i
= 0; i
< shnum
; i
++) {
273 shname
= shstr
+ sec
->sh_name
;
274 if (!strcmp(shname
, name
))
280 int find_reloc(int sh_index
)
282 struct elf_shdr
*sec
;
285 for(i
= 0; i
< ehdr
.e_shnum
; i
++) {
287 if (sec
->sh_type
== SHT_RELOC
&& sec
->sh_info
== sh_index
)
293 void *load_data(int fd
, long offset
, unsigned int size
)
300 lseek(fd
, offset
, SEEK_SET
);
301 if (read(fd
, data
, size
) != size
) {
308 int strstart(const char *str
, const char *val
, const char **ptr
)
326 int arm_emit_ldr_info(const char *name
, unsigned long start_offset
,
327 FILE *outfile
, uint8_t *p_start
, uint8_t *p_end
,
328 ELF_RELOC
*relocs
, int nb_relocs
)
332 int offset
, min_offset
, pc_offset
, data_size
;
333 uint8_t data_allocated
[1024];
334 unsigned int data_index
;
336 memset(data_allocated
, 0, sizeof(data_allocated
));
339 min_offset
= p_end
- p_start
;
340 while (p
< p_start
+ min_offset
) {
341 insn
= get32((uint32_t *)p
);
342 if ((insn
& 0x0d5f0000) == 0x051f0000) {
343 /* ldr reg, [pc, #im] */
344 offset
= insn
& 0xfff;
345 if (!(insn
& 0x00800000))
347 if ((offset
& 3) !=0)
348 error("%s:%04x: ldr pc offset must be 32 bit aligned",
349 name
, start_offset
+ p
- p_start
);
350 pc_offset
= p
- p_start
+ offset
+ 8;
351 if (pc_offset
<= (p
- p_start
) ||
352 pc_offset
>= (p_end
- p_start
))
353 error("%s:%04x: ldr pc offset must point inside the function code",
354 name
, start_offset
+ p
- p_start
);
355 if (pc_offset
< min_offset
)
356 min_offset
= pc_offset
;
359 fprintf(outfile
, " arm_ldr_ptr->ptr = gen_code_ptr + %d;\n",
362 data_index
= ((p_end
- p_start
) - pc_offset
- 4) >> 2;
363 fprintf(outfile
, " arm_ldr_ptr->data_ptr = arm_data_ptr + %d;\n",
365 fprintf(outfile
, " arm_ldr_ptr++;\n");
366 if (data_index
>= sizeof(data_allocated
))
367 error("%s: too many data", name
);
368 if (!data_allocated
[data_index
]) {
371 const char *sym_name
, *p
;
374 data_allocated
[data_index
] = 1;
377 addend
= get32((uint32_t *)(p_start
+ pc_offset
));
379 for(i
= 0, rel
= relocs
;i
< nb_relocs
; i
++, rel
++) {
380 if (rel
->r_offset
== (pc_offset
+ start_offset
)) {
381 sym_name
= strtab
+ symtab
[ELFW(R_SYM
)(rel
->r_info
)].st_name
;
382 /* the compiler leave some unnecessary references to the code */
383 if (strstart(sym_name
, "__op_param", &p
)) {
384 snprintf(relname
, sizeof(relname
), "param%s", p
);
386 snprintf(relname
, sizeof(relname
), "(long)(&%s)", sym_name
);
388 type
= ELF32_R_TYPE(rel
->r_info
);
389 if (type
!= R_ARM_ABS32
)
390 error("%s: unsupported data relocation", name
);
394 fprintf(outfile
, " arm_data_ptr[%d] = 0x%x",
396 if (relname
[0] != '\0')
397 fprintf(outfile
, " + %s", relname
);
398 fprintf(outfile
, ";\n");
404 data_size
= (p_end
- p_start
) - min_offset
;
405 if (data_size
> 0 && outfile
) {
406 fprintf(outfile
, " arm_data_ptr += %d;\n", data_size
>> 2);
409 /* the last instruction must be a mov pc, lr */
413 insn
= get32((uint32_t *)p
);
414 if ((insn
& 0xffff0000) != 0xe91b0000) {
417 printf("%s: invalid epilog\n", name
);
426 /* generate op code */
427 void gen_code(const char *name
, host_ulong offset
, host_ulong size
,
428 FILE *outfile
, uint8_t *text
, ELF_RELOC
*relocs
, int nb_relocs
,
432 uint8_t *p_start
, *p_end
;
433 host_ulong start_offset
;
435 uint8_t args_present
[MAX_ARGS
];
436 const char *sym_name
, *p
;
439 /* Compute exact size excluding prologue and epilogue instructions.
440 * Increment start_offset to skip epilogue instructions, then compute
441 * copy_size the indicate the size of the remaining instructions (in
444 p_start
= text
+ offset
;
445 p_end
= p_start
+ size
;
446 start_offset
= offset
;
451 len
= p_end
- p_start
;
453 error("empty code for %s", name
);
454 if (p_end
[-1] == 0xc3) {
457 error("ret or jmp expected at the end of %s", name
);
465 p
= (void *)(p_end
- 4);
467 error("empty code for %s", name
);
468 if (get32((uint32_t *)p
) != 0x4e800020)
469 error("blr expected at the end of %s", name
);
470 copy_size
= p
- p_start
;
476 p
= (void *)(p_end
- 2);
478 error("empty code for %s", name
);
479 if (get16((uint16_t *)p
) != 0x07fe && get16((uint16_t *)p
) != 0x07f4)
480 error("br %%r14 expected at the end of %s", name
);
481 copy_size
= p
- p_start
;
489 /* XXX: check why it occurs */
491 error("empty code for %s", name
);
493 if (get32((uint32_t *)p
) != 0x6bfa8001)
494 error("ret expected at the end of %s", name
);
495 copy_size
= p
- p_start
;
501 p
= (void *)(p_end
- 4);
503 error("empty code for %s", name
);
504 /* br.ret.sptk.many b0;; */
506 if (get32((uint32_t *)p
) != 0x00840008)
507 error("br.ret.sptk.many b0;; expected at the end of %s", name
);
508 copy_size
= p
- p_start
;
514 uint32_t start_insn
, end_insn1
, end_insn2
;
516 p
= (void *)(p_end
- 8);
518 error("empty code for %s", name
);
519 start_insn
= get32((uint32_t *)(p_start
+ 0x0));
520 end_insn1
= get32((uint32_t *)(p
+ 0x0));
521 end_insn2
= get32((uint32_t *)(p
+ 0x4));
522 if ((start_insn
& ~0x1fff) == 0x9de3a000) {
525 if ((int)(start_insn
| ~0x1fff) < -128)
526 error("Found bogus save at the start of %s", name
);
527 if (end_insn1
!= 0x81c7e008 || end_insn2
!= 0x81e80000)
528 error("ret; restore; not found at end of %s", name
);
530 error("No save at the beginning of %s", name
);
533 /* Skip a preceeding nop, if present. */
535 skip_insn
= get32((uint32_t *)(p
- 0x4));
536 if (skip_insn
== 0x01000000)
540 copy_size
= p
- p_start
;
545 uint32_t start_insn
, end_insn1
, end_insn2
, skip_insn
;
547 p
= (void *)(p_end
- 8);
549 error("empty code for %s", name
);
550 start_insn
= get32((uint32_t *)(p_start
+ 0x0));
551 end_insn1
= get32((uint32_t *)(p
+ 0x0));
552 end_insn2
= get32((uint32_t *)(p
+ 0x4));
553 if ((start_insn
& ~0x1fff) == 0x9de3a000) {
556 if ((int)(start_insn
| ~0x1fff) < -256)
557 error("Found bogus save at the start of %s", name
);
558 if (end_insn1
!= 0x81c7e008 || end_insn2
!= 0x81e80000)
559 error("ret; restore; not found at end of %s", name
);
561 error("No save at the beginning of %s", name
);
564 /* Skip a preceeding nop, if present. */
566 skip_insn
= get32((uint32_t *)(p
- 0x4));
567 if (skip_insn
== 0x01000000)
571 copy_size
= p
- p_start
;
576 if ((p_end
- p_start
) <= 16)
577 error("%s: function too small", name
);
578 if (get32((uint32_t *)p_start
) != 0xe1a0c00d ||
579 (get32((uint32_t *)(p_start
+ 4)) & 0xffff0000) != 0xe92d0000 ||
580 get32((uint32_t *)(p_start
+ 8)) != 0xe24cb004)
581 error("%s: invalid prolog", name
);
584 copy_size
= arm_emit_ldr_info(name
, start_offset
, NULL
, p_start
, p_end
,
591 p
= (void *)(p_end
- 2);
593 error("empty code for %s", name
);
594 // remove NOP's, probably added for alignment
595 while ((get16((uint16_t *)p
) == 0x4e71) &&
598 if (get16((uint16_t *)p
) != 0x4e75)
599 error("rts expected at the end of %s", name
);
600 copy_size
= p
- p_start
;
604 error("unknown ELF architecture");
607 /* compute the number of arguments by looking at the relocations */
608 for(i
= 0;i
< MAX_ARGS
; i
++)
611 for(i
= 0, rel
= relocs
;i
< nb_relocs
; i
++, rel
++) {
612 if (rel
->r_offset
>= start_offset
&&
613 rel
->r_offset
< start_offset
+ (p_end
- p_start
)) {
614 sym_name
= strtab
+ symtab
[ELFW(R_SYM
)(rel
->r_info
)].st_name
;
615 if (strstart(sym_name
, "__op_param", &p
)) {
616 n
= strtoul(p
, NULL
, 10);
618 error("too many arguments in %s", name
);
619 args_present
[n
- 1] = 1;
625 while (nb_args
< MAX_ARGS
&& args_present
[nb_args
])
627 for(i
= nb_args
; i
< MAX_ARGS
; i
++) {
629 error("inconsistent argument numbering in %s", name
);
632 if (gen_switch
== 2) {
633 fprintf(outfile
, "DEF(%s, %d, %d)\n", name
+ 3, nb_args
, copy_size
);
634 } else if (gen_switch
== 1) {
637 fprintf(outfile
, "case INDEX_%s: {\n", name
);
639 fprintf(outfile
, " long ");
640 for(i
= 0; i
< nb_args
; i
++) {
642 fprintf(outfile
, ", ");
643 fprintf(outfile
, "param%d", i
+ 1);
645 fprintf(outfile
, ";\n");
647 fprintf(outfile
, " extern void %s();\n", name
);
649 for(i
= 0, rel
= relocs
;i
< nb_relocs
; i
++, rel
++) {
650 if (rel
->r_offset
>= start_offset
&&
651 rel
->r_offset
< start_offset
+ (p_end
- p_start
)) {
652 sym_name
= strtab
+ symtab
[ELFW(R_SYM
)(rel
->r_info
)].st_name
;
654 !strstart(sym_name
, "__op_param", NULL
) &&
655 !strstart(sym_name
, "__op_jmp", NULL
)) {
656 #if defined(HOST_SPARC)
657 if (sym_name
[0] == '.') {
659 "extern char __dot_%s __asm__(\"%s\");\n",
660 sym_name
+1, sym_name
);
664 fprintf(outfile
, "extern char %s;\n", sym_name
);
669 fprintf(outfile
, " memcpy(gen_code_ptr, (void *)((char *)&%s+%d), %d);\n", name
, start_offset
- offset
, copy_size
);
671 /* emit code offset information */
674 const char *sym_name
, *p
;
678 for(i
= 0, sym
= symtab
; i
< nb_syms
; i
++, sym
++) {
679 sym_name
= strtab
+ sym
->st_name
;
680 if (strstart(sym_name
, "__op_label", &p
)) {
682 unsigned long offset
;
684 /* test if the variable refers to a label inside
685 the code we are generating */
686 ptr
= sdata
[sym
->st_shndx
];
688 error("__op_labelN in invalid section");
689 offset
= sym
->st_value
;
690 val
= *(unsigned long *)(ptr
+ offset
);
691 #ifdef ELF_USES_RELOCA
693 int reloc_shndx
, nb_relocs1
, j
;
695 /* try to find a matching relocation */
696 reloc_shndx
= find_reloc(sym
->st_shndx
);
698 nb_relocs1
= shdr
[reloc_shndx
].sh_size
/
699 shdr
[reloc_shndx
].sh_entsize
;
700 rel
= (ELF_RELOC
*)sdata
[reloc_shndx
];
701 for(j
= 0; j
< nb_relocs1
; j
++) {
702 if (rel
->r_offset
== offset
) {
712 if (val
>= start_offset
&& val
< start_offset
+ copy_size
) {
713 n
= strtol(p
, NULL
, 10);
714 fprintf(outfile
, " label_offsets[%d] = %ld + (gen_code_ptr - gen_code_buf);\n", n
, val
- start_offset
);
720 /* load parameres in variables */
721 for(i
= 0; i
< nb_args
; i
++) {
722 fprintf(outfile
, " param%d = *opparam_ptr++;\n", i
+ 1);
725 /* patch relocations */
726 #if defined(HOST_I386)
731 for(i
= 0, rel
= relocs
;i
< nb_relocs
; i
++, rel
++) {
732 if (rel
->r_offset
>= start_offset
&&
733 rel
->r_offset
< start_offset
+ copy_size
) {
734 sym_name
= strtab
+ symtab
[ELFW(R_SYM
)(rel
->r_info
)].st_name
;
735 if (strstart(sym_name
, "__op_jmp", &p
)) {
737 n
= strtol(p
, NULL
, 10);
738 /* __op_jmp relocations are done at
739 runtime to do translated block
740 chaining: the offset of the instruction
741 needs to be stored */
742 fprintf(outfile
, " jmp_offsets[%d] = %d + (gen_code_ptr - gen_code_buf);\n",
743 n
, rel
->r_offset
- start_offset
);
747 if (strstart(sym_name
, "__op_param", &p
)) {
748 snprintf(name
, sizeof(name
), "param%s", p
);
750 snprintf(name
, sizeof(name
), "(long)(&%s)", sym_name
);
752 type
= ELF32_R_TYPE(rel
->r_info
);
753 addend
= get32((uint32_t *)(text
+ rel
->r_offset
));
756 fprintf(outfile
, " *(uint32_t *)(gen_code_ptr + %d) = %s + %d;\n",
757 rel
->r_offset
- start_offset
, name
, addend
);
760 fprintf(outfile
, " *(uint32_t *)(gen_code_ptr + %d) = %s - (long)(gen_code_ptr + %d) + %d;\n",
761 rel
->r_offset
- start_offset
, name
, rel
->r_offset
- start_offset
, addend
);
764 error("unsupported i386 relocation (%d)", type
);
769 #elif defined(HOST_PPC)
774 for(i
= 0, rel
= relocs
;i
< nb_relocs
; i
++, rel
++) {
775 if (rel
->r_offset
>= start_offset
&&
776 rel
->r_offset
< start_offset
+ copy_size
) {
777 sym_name
= strtab
+ symtab
[ELFW(R_SYM
)(rel
->r_info
)].st_name
;
778 if (strstart(sym_name
, "__op_jmp", &p
)) {
780 n
= strtol(p
, NULL
, 10);
781 /* __op_jmp relocations are done at
782 runtime to do translated block
783 chaining: the offset of the instruction
784 needs to be stored */
785 fprintf(outfile
, " jmp_offsets[%d] = %d + (gen_code_ptr - gen_code_buf);\n",
786 n
, rel
->r_offset
- start_offset
);
790 if (strstart(sym_name
, "__op_param", &p
)) {
791 snprintf(name
, sizeof(name
), "param%s", p
);
793 snprintf(name
, sizeof(name
), "(long)(&%s)", sym_name
);
795 type
= ELF32_R_TYPE(rel
->r_info
);
796 addend
= rel
->r_addend
;
799 fprintf(outfile
, " *(uint32_t *)(gen_code_ptr + %d) = %s + %d;\n",
800 rel
->r_offset
- start_offset
, name
, addend
);
802 case R_PPC_ADDR16_LO
:
803 fprintf(outfile
, " *(uint16_t *)(gen_code_ptr + %d) = (%s + %d);\n",
804 rel
->r_offset
- start_offset
, name
, addend
);
806 case R_PPC_ADDR16_HI
:
807 fprintf(outfile
, " *(uint16_t *)(gen_code_ptr + %d) = (%s + %d) >> 16;\n",
808 rel
->r_offset
- start_offset
, name
, addend
);
810 case R_PPC_ADDR16_HA
:
811 fprintf(outfile
, " *(uint16_t *)(gen_code_ptr + %d) = (%s + %d + 0x8000) >> 16;\n",
812 rel
->r_offset
- start_offset
, name
, addend
);
815 /* warning: must be at 32 MB distancy */
816 fprintf(outfile
, " *(uint32_t *)(gen_code_ptr + %d) = (*(uint32_t *)(gen_code_ptr + %d) & ~0x03fffffc) | ((%s - (long)(gen_code_ptr + %d) + %d) & 0x03fffffc);\n",
817 rel
->r_offset
- start_offset
, rel
->r_offset
- start_offset
, name
, rel
->r_offset
- start_offset
, addend
);
820 error("unsupported powerpc relocation (%d)", type
);
825 #elif defined(HOST_S390)
830 for(i
= 0, rel
= relocs
;i
< nb_relocs
; i
++, rel
++) {
831 if (rel
->r_offset
>= start_offset
&&
832 rel
->r_offset
< start_offset
+ copy_size
) {
833 sym_name
= strtab
+ symtab
[ELFW(R_SYM
)(rel
->r_info
)].st_name
;
834 if (strstart(sym_name
, "__op_param", &p
)) {
835 snprintf(name
, sizeof(name
), "param%s", p
);
837 snprintf(name
, sizeof(name
), "(long)(&%s)", sym_name
);
839 type
= ELF32_R_TYPE(rel
->r_info
);
840 addend
= rel
->r_addend
;
843 fprintf(outfile
, " *(uint32_t *)(gen_code_ptr + %d) = %s + %d;\n",
844 rel
->r_offset
- start_offset
, name
, addend
);
847 fprintf(outfile
, " *(uint16_t *)(gen_code_ptr + %d) = %s + %d;\n",
848 rel
->r_offset
- start_offset
, name
, addend
);
851 fprintf(outfile
, " *(uint8_t *)(gen_code_ptr + %d) = %s + %d;\n",
852 rel
->r_offset
- start_offset
, name
, addend
);
855 error("unsupported s390 relocation (%d)", type
);
860 #elif defined(HOST_ALPHA)
862 for (i
= 0, rel
= relocs
; i
< nb_relocs
; i
++, rel
++) {
863 if (rel
->r_offset
>= start_offset
&& rel
->r_offset
< start_offset
+ copy_size
) {
866 type
= ELF64_R_TYPE(rel
->r_info
);
867 sym_name
= strtab
+ symtab
[ELF64_R_SYM(rel
->r_info
)].st_name
;
870 /* The gp is just 32 bit, and never changes, so it's easiest to emit it
871 as an immediate instead of constructing it from the pv or ra. */
872 fprintf(outfile
, " immediate_ldah(gen_code_ptr + %ld, gp);\n",
873 rel
->r_offset
- start_offset
);
874 fprintf(outfile
, " immediate_lda(gen_code_ptr + %ld, gp);\n",
875 rel
->r_offset
- start_offset
+ rel
->r_addend
);
878 /* jsr to literal hint. Could be used to optimize to bsr. Ignore for
879 now, since some called functions (libc) need pv to be set up. */
882 /* Branch target prediction hint. Ignore for now. Should be already
883 correct for in-function jumps. */
885 case R_ALPHA_LITERAL
:
886 /* Load a literal from the GOT relative to the gp. Since there's only a
887 single gp, nothing is to be done. */
889 case R_ALPHA_GPRELHIGH
:
890 /* Handle fake relocations against __op_param symbol. Need to emit the
891 high part of the immediate value instead. Other symbols need no
892 special treatment. */
893 if (strstart(sym_name
, "__op_param", &p
))
894 fprintf(outfile
, " immediate_ldah(gen_code_ptr + %ld, param%s);\n",
895 rel
->r_offset
- start_offset
, p
);
897 case R_ALPHA_GPRELLOW
:
898 if (strstart(sym_name
, "__op_param", &p
))
899 fprintf(outfile
, " immediate_lda(gen_code_ptr + %ld, param%s);\n",
900 rel
->r_offset
- start_offset
, p
);
903 /* PC-relative jump. Tweak offset to skip the two instructions that try to
904 set up the gp from the pv. */
905 fprintf(outfile
, " fix_bsr(gen_code_ptr + %ld, (uint8_t *) &%s - (gen_code_ptr + %ld + 4) + 8);\n",
906 rel
->r_offset
- start_offset
, sym_name
, rel
->r_offset
- start_offset
);
909 error("unsupported Alpha relocation (%d)", type
);
914 #elif defined(HOST_IA64)
919 for(i
= 0, rel
= relocs
;i
< nb_relocs
; i
++, rel
++) {
920 if (rel
->r_offset
>= start_offset
&& rel
->r_offset
< start_offset
+ copy_size
) {
921 sym_name
= strtab
+ symtab
[ELF64_R_SYM(rel
->r_info
)].st_name
;
922 if (strstart(sym_name
, "__op_param", &p
)) {
923 snprintf(name
, sizeof(name
), "param%s", p
);
925 snprintf(name
, sizeof(name
), "(long)(&%s)", sym_name
);
927 type
= ELF64_R_TYPE(rel
->r_info
);
928 addend
= rel
->r_addend
;
931 error("must implemnt R_IA64_LTOFF22 relocation");
932 case R_IA64_PCREL21B
:
933 error("must implemnt R_IA64_PCREL21B relocation");
935 error("unsupported ia64 relocation (%d)", type
);
940 #elif defined(HOST_SPARC)
945 for(i
= 0, rel
= relocs
;i
< nb_relocs
; i
++, rel
++) {
946 if (rel
->r_offset
>= start_offset
&&
947 rel
->r_offset
< start_offset
+ copy_size
) {
948 sym_name
= strtab
+ symtab
[ELF32_R_SYM(rel
->r_info
)].st_name
;
949 if (strstart(sym_name
, "__op_param", &p
)) {
950 snprintf(name
, sizeof(name
), "param%s", p
);
952 if (sym_name
[0] == '.')
953 snprintf(name
, sizeof(name
),
957 snprintf(name
, sizeof(name
),
958 "(long)(&%s)", sym_name
);
960 type
= ELF32_R_TYPE(rel
->r_info
);
961 addend
= rel
->r_addend
;
964 fprintf(outfile
, " *(uint32_t *)(gen_code_ptr + %d) = %s + %d;\n",
965 rel
->r_offset
- start_offset
, name
, addend
);
969 " *(uint32_t *)(gen_code_ptr + %d) = "
970 "((*(uint32_t *)(gen_code_ptr + %d)) "
972 " | (((%s + %d) >> 10) & 0x3fffff);\n",
973 rel
->r_offset
- start_offset
,
974 rel
->r_offset
- start_offset
,
979 " *(uint32_t *)(gen_code_ptr + %d) = "
980 "((*(uint32_t *)(gen_code_ptr + %d)) "
982 " | ((%s + %d) & 0x3ff);\n",
983 rel
->r_offset
- start_offset
,
984 rel
->r_offset
- start_offset
,
987 case R_SPARC_WDISP30
:
989 " *(uint32_t *)(gen_code_ptr + %d) = "
990 "((*(uint32_t *)(gen_code_ptr + %d)) "
992 " | ((((%s + %d) - (long)(gen_code_ptr + %d))>>2) "
994 rel
->r_offset
- start_offset
,
995 rel
->r_offset
- start_offset
,
997 rel
->r_offset
- start_offset
);
1000 error("unsupported sparc relocation (%d)", type
);
1005 #elif defined(HOST_SPARC64)
1010 for(i
= 0, rel
= relocs
;i
< nb_relocs
; i
++, rel
++) {
1011 if (rel
->r_offset
>= start_offset
&&
1012 rel
->r_offset
< start_offset
+ copy_size
) {
1013 sym_name
= strtab
+ symtab
[ELF64_R_SYM(rel
->r_info
)].st_name
;
1014 if (strstart(sym_name
, "__op_param", &p
)) {
1015 snprintf(name
, sizeof(name
), "param%s", p
);
1017 snprintf(name
, sizeof(name
), "(long)(&%s)", sym_name
);
1019 type
= ELF64_R_TYPE(rel
->r_info
);
1020 addend
= rel
->r_addend
;
1023 fprintf(outfile
, " *(uint32_t *)(gen_code_ptr + %d) = %s + %d;\n",
1024 rel
->r_offset
- start_offset
, name
, addend
);
1028 " *(uint32_t *)(gen_code_ptr + %d) = "
1029 "((*(uint32_t *)(gen_code_ptr + %d)) "
1031 " | (((%s + %d) >> 10) & 0x3fffff);\n",
1032 rel
->r_offset
- start_offset
,
1033 rel
->r_offset
- start_offset
,
1038 " *(uint32_t *)(gen_code_ptr + %d) = "
1039 "((*(uint32_t *)(gen_code_ptr + %d)) "
1041 " | ((%s + %d) & 0x3ff);\n",
1042 rel
->r_offset
- start_offset
,
1043 rel
->r_offset
- start_offset
,
1046 case R_SPARC_WDISP30
:
1048 " *(uint32_t *)(gen_code_ptr + %d) = "
1049 "((*(uint32_t *)(gen_code_ptr + %d)) "
1051 " | ((((%s + %d) - (long)(gen_code_ptr + %d))>>2) "
1052 " & 0x3fffffff);\n",
1053 rel
->r_offset
- start_offset
,
1054 rel
->r_offset
- start_offset
,
1056 rel
->r_offset
- start_offset
);
1059 error("unsupported sparc64 relocation (%d)", type
);
1064 #elif defined(HOST_ARM)
1070 arm_emit_ldr_info(name
, start_offset
, outfile
, p_start
, p_end
,
1073 for(i
= 0, rel
= relocs
;i
< nb_relocs
; i
++, rel
++) {
1074 if (rel
->r_offset
>= start_offset
&&
1075 rel
->r_offset
< start_offset
+ copy_size
) {
1076 sym_name
= strtab
+ symtab
[ELFW(R_SYM
)(rel
->r_info
)].st_name
;
1077 /* the compiler leave some unnecessary references to the code */
1078 if (sym_name
[0] == '\0')
1080 if (strstart(sym_name
, "__op_param", &p
)) {
1081 snprintf(name
, sizeof(name
), "param%s", p
);
1083 snprintf(name
, sizeof(name
), "(long)(&%s)", sym_name
);
1085 type
= ELF32_R_TYPE(rel
->r_info
);
1086 addend
= get32((uint32_t *)(text
+ rel
->r_offset
));
1089 fprintf(outfile
, " *(uint32_t *)(gen_code_ptr + %d) = %s + %d;\n",
1090 rel
->r_offset
- start_offset
, name
, addend
);
1093 fprintf(outfile
, " arm_reloc_pc24((uint32_t *)(gen_code_ptr + %d), 0x%x, %s);\n",
1094 rel
->r_offset
- start_offset
, addend
, name
);
1097 error("unsupported arm relocation (%d)", type
);
1102 #elif defined(HOST_M68K)
1108 for(i
= 0, rel
= relocs
;i
< nb_relocs
; i
++, rel
++) {
1109 if (rel
->r_offset
>= start_offset
&&
1110 rel
->r_offset
< start_offset
+ copy_size
) {
1111 sym
= &(symtab
[ELFW(R_SYM
)(rel
->r_info
)]);
1112 sym_name
= strtab
+ symtab
[ELFW(R_SYM
)(rel
->r_info
)].st_name
;
1113 if (strstart(sym_name
, "__op_param", &p
)) {
1114 snprintf(name
, sizeof(name
), "param%s", p
);
1116 snprintf(name
, sizeof(name
), "(long)(&%s)", sym_name
);
1118 type
= ELF32_R_TYPE(rel
->r_info
);
1119 addend
= get32((uint32_t *)(text
+ rel
->r_offset
)) + rel
->r_addend
;
1122 fprintf(outfile
, " /* R_68K_32 RELOC, offset %x */\n", rel
->r_offset
) ;
1123 fprintf(outfile
, " *(uint32_t *)(gen_code_ptr + %d) = %s + %#x;\n",
1124 rel
->r_offset
- start_offset
, name
, addend
);
1127 fprintf(outfile
, " /* R_68K_PC32 RELOC, offset %x */\n", rel
->r_offset
);
1128 fprintf(outfile
, " *(uint32_t *)(gen_code_ptr + %d) = %s - (long)(gen_code_ptr + %#x) + %#x;\n",
1129 rel
->r_offset
- start_offset
, name
, rel
->r_offset
- start_offset
, /*sym->st_value+*/ addend
);
1132 error("unsupported m68k relocation (%d)", type
);
1138 #error unsupported CPU
1140 fprintf(outfile
, " gen_code_ptr += %d;\n", copy_size
);
1141 fprintf(outfile
, "}\n");
1142 fprintf(outfile
, "break;\n\n");
1144 fprintf(outfile
, "static inline void gen_%s(", name
);
1146 fprintf(outfile
, "void");
1148 for(i
= 0; i
< nb_args
; i
++) {
1150 fprintf(outfile
, ", ");
1151 fprintf(outfile
, "long param%d", i
+ 1);
1154 fprintf(outfile
, ")\n");
1155 fprintf(outfile
, "{\n");
1156 for(i
= 0; i
< nb_args
; i
++) {
1157 fprintf(outfile
, " *gen_opparam_ptr++ = param%d;\n", i
+ 1);
1159 fprintf(outfile
, " *gen_opc_ptr++ = INDEX_%s;\n", name
);
1160 fprintf(outfile
, "}\n\n");
1164 /* load an elf object file */
1165 int load_elf(const char *filename
, FILE *outfile
, int out_type
)
1168 struct elf_shdr
*sec
, *symtab_sec
, *strtab_sec
, *text_sec
;
1177 fd
= open(filename
, O_RDONLY
);
1179 error("can't open file '%s'", filename
);
1181 /* Read ELF header. */
1182 if (read(fd
, &ehdr
, sizeof (ehdr
)) != sizeof (ehdr
))
1183 error("unable to read file header");
1185 /* Check ELF identification. */
1186 if (ehdr
.e_ident
[EI_MAG0
] != ELFMAG0
1187 || ehdr
.e_ident
[EI_MAG1
] != ELFMAG1
1188 || ehdr
.e_ident
[EI_MAG2
] != ELFMAG2
1189 || ehdr
.e_ident
[EI_MAG3
] != ELFMAG3
1190 || ehdr
.e_ident
[EI_VERSION
] != EV_CURRENT
) {
1191 error("bad ELF header");
1194 do_swap
= elf_must_swap(&ehdr
);
1196 elf_swap_ehdr(&ehdr
);
1197 if (ehdr
.e_ident
[EI_CLASS
] != ELF_CLASS
)
1198 error("Unsupported ELF class");
1199 if (ehdr
.e_type
!= ET_REL
)
1200 error("ELF object file expected");
1201 if (ehdr
.e_version
!= EV_CURRENT
)
1202 error("Invalid ELF version");
1203 if (!elf_check_arch(ehdr
.e_machine
))
1204 error("Unsupported CPU (e_machine=%d)", ehdr
.e_machine
);
1206 /* read section headers */
1207 shdr
= load_data(fd
, ehdr
.e_shoff
, ehdr
.e_shnum
* sizeof(struct elf_shdr
));
1209 for(i
= 0; i
< ehdr
.e_shnum
; i
++) {
1210 elf_swap_shdr(&shdr
[i
]);
1214 /* read all section data */
1215 sdata
= malloc(sizeof(void *) * ehdr
.e_shnum
);
1216 memset(sdata
, 0, sizeof(void *) * ehdr
.e_shnum
);
1218 for(i
= 0;i
< ehdr
.e_shnum
; i
++) {
1220 if (sec
->sh_type
!= SHT_NOBITS
)
1221 sdata
[i
] = load_data(fd
, sec
->sh_offset
, sec
->sh_size
);
1224 sec
= &shdr
[ehdr
.e_shstrndx
];
1225 shstr
= sdata
[ehdr
.e_shstrndx
];
1227 /* swap relocations */
1228 for(i
= 0; i
< ehdr
.e_shnum
; i
++) {
1230 if (sec
->sh_type
== SHT_RELOC
) {
1231 nb_relocs
= sec
->sh_size
/ sec
->sh_entsize
;
1233 for(j
= 0, rel
= (ELF_RELOC
*)sdata
[i
]; j
< nb_relocs
; j
++, rel
++)
1240 text_sec
= find_elf_section(shdr
, ehdr
.e_shnum
, shstr
, ".text");
1242 error("could not find .text section");
1243 text_shndx
= text_sec
- shdr
;
1244 text
= sdata
[text_shndx
];
1246 /* find text relocations, if any */
1249 i
= find_reloc(text_shndx
);
1251 relocs
= (ELF_RELOC
*)sdata
[i
];
1252 nb_relocs
= shdr
[i
].sh_size
/ shdr
[i
].sh_entsize
;
1255 symtab_sec
= find_elf_section(shdr
, ehdr
.e_shnum
, shstr
, ".symtab");
1257 error("could not find .symtab section");
1258 strtab_sec
= &shdr
[symtab_sec
->sh_link
];
1260 symtab
= (ElfW(Sym
) *)sdata
[symtab_sec
- shdr
];
1261 strtab
= sdata
[symtab_sec
->sh_link
];
1263 nb_syms
= symtab_sec
->sh_size
/ sizeof(ElfW(Sym
));
1265 for(i
= 0, sym
= symtab
; i
< nb_syms
; i
++, sym
++) {
1266 swab32s(&sym
->st_name
);
1267 swabls(&sym
->st_value
);
1268 swabls(&sym
->st_size
);
1269 swab16s(&sym
->st_shndx
);
1273 if (out_type
== OUT_INDEX_OP
) {
1274 fprintf(outfile
, "DEF(end, 0, 0)\n");
1275 fprintf(outfile
, "DEF(nop, 0, 0)\n");
1276 fprintf(outfile
, "DEF(nop1, 1, 0)\n");
1277 fprintf(outfile
, "DEF(nop2, 2, 0)\n");
1278 fprintf(outfile
, "DEF(nop3, 3, 0)\n");
1279 for(i
= 0, sym
= symtab
; i
< nb_syms
; i
++, sym
++) {
1280 const char *name
, *p
;
1281 name
= strtab
+ sym
->st_name
;
1282 if (strstart(name
, OP_PREFIX
, &p
)) {
1283 gen_code(name
, sym
->st_value
, sym
->st_size
, outfile
,
1284 text
, relocs
, nb_relocs
, 2);
1287 } else if (out_type
== OUT_GEN_OP
) {
1288 /* generate gen_xxx functions */
1290 for(i
= 0, sym
= symtab
; i
< nb_syms
; i
++, sym
++) {
1292 name
= strtab
+ sym
->st_name
;
1293 if (strstart(name
, OP_PREFIX
, NULL
)) {
1294 if (sym
->st_shndx
!= (text_sec
- shdr
))
1295 error("invalid section for opcode (0x%x)", sym
->st_shndx
);
1296 gen_code(name
, sym
->st_value
, sym
->st_size
, outfile
,
1297 text
, relocs
, nb_relocs
, 0);
1302 /* generate big code generation switch */
1304 "int dyngen_code(uint8_t *gen_code_buf,\n"
1305 " uint16_t *label_offsets, uint16_t *jmp_offsets,\n"
1306 " const uint16_t *opc_buf, const uint32_t *opparam_buf)\n"
1308 " uint8_t *gen_code_ptr;\n"
1309 " const uint16_t *opc_ptr;\n"
1310 " const uint32_t *opparam_ptr;\n");
1314 " uint8_t *last_gen_code_ptr = gen_code_buf;\n"
1315 " LDREntry *arm_ldr_ptr = arm_ldr_table;\n"
1316 " uint32_t *arm_data_ptr = arm_data_table;\n");
1321 " gen_code_ptr = gen_code_buf;\n"
1322 " opc_ptr = opc_buf;\n"
1323 " opparam_ptr = opparam_buf;\n");
1325 /* Generate prologue, if needed. */
1329 " switch(*opc_ptr++) {\n"
1332 for(i
= 0, sym
= symtab
; i
< nb_syms
; i
++, sym
++) {
1334 name
= strtab
+ sym
->st_name
;
1335 if (strstart(name
, OP_PREFIX
, NULL
)) {
1337 printf("%4d: %s pos=0x%08x len=%d\n",
1338 i
, name
, sym
->st_value
, sym
->st_size
);
1340 if (sym
->st_shndx
!= (text_sec
- shdr
))
1341 error("invalid section for opcode (0x%x)", sym
->st_shndx
);
1342 gen_code(name
, sym
->st_value
, sym
->st_size
, outfile
,
1343 text
, relocs
, nb_relocs
, 1);
1348 " case INDEX_op_nop:\n"
1350 " case INDEX_op_nop1:\n"
1353 " case INDEX_op_nop2:\n"
1354 " opparam_ptr += 2;\n"
1356 " case INDEX_op_nop3:\n"
1357 " opparam_ptr += 3;\n"
1364 /* generate constant table if needed */
1366 " if ((gen_code_ptr - last_gen_code_ptr) >= (MAX_FRAG_SIZE - MAX_OP_SIZE)) {\n"
1367 " gen_code_ptr = arm_flush_ldr(gen_code_ptr, arm_ldr_table, arm_ldr_ptr, arm_data_table, arm_data_ptr, 1);\n"
1368 " last_gen_code_ptr = gen_code_ptr;\n"
1369 " arm_ldr_ptr = arm_ldr_table;\n"
1370 " arm_data_ptr = arm_data_table;\n"
1380 /* generate some code patching */
1382 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");
1384 /* flush instruction cache */
1385 fprintf(outfile
, "flush_icache_range((unsigned long)gen_code_buf, (unsigned long)gen_code_ptr);\n");
1387 fprintf(outfile
, "return gen_code_ptr - gen_code_buf;\n");
1388 fprintf(outfile
, "}\n\n");
1398 printf("dyngen (c) 2003 Fabrice Bellard\n"
1399 "usage: dyngen [-o outfile] [-c] objfile\n"
1400 "Generate a dynamic code generator from an object file\n"
1401 "-c output enum of operations\n"
1402 "-g output gen_op_xx() functions\n"
1407 int main(int argc
, char **argv
)
1410 const char *filename
, *outfilename
;
1413 outfilename
= "out.c";
1414 out_type
= OUT_CODE
;
1416 c
= getopt(argc
, argv
, "ho:cg");
1424 outfilename
= optarg
;
1427 out_type
= OUT_INDEX_OP
;
1430 out_type
= OUT_GEN_OP
;
1436 filename
= argv
[optind
];
1437 outfile
= fopen(outfilename
, "w");
1439 error("could not open '%s'", outfilename
);
1440 load_elf(filename
, outfile
, out_type
);