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 error("empty code for %s", name);
490 if (get32((uint32_t *)p) != 0x6bfa8001)
491 error("ret expected at the end of %s", name);
492 copy_size = p - p_start;
498 p = (void *)(p_end - 4);
500 error("empty code for %s", name);
501 /* br.ret.sptk.many b0;; */
503 if (get32((uint32_t *)p) != 0x00840008)
504 error("br.ret.sptk.many b0;; expected at the end of %s", name);
505 copy_size = p - p_start;
511 uint32_t start_insn, end_insn1, end_insn2;
513 p = (void *)(p_end - 8);
515 error("empty code for %s", name);
516 start_insn = get32((uint32_t *)(p_start + 0x0));
517 end_insn1 = get32((uint32_t *)(p + 0x0));
518 end_insn2 = get32((uint32_t *)(p + 0x4));
519 if ((start_insn & ~0x1fff) == 0x9de3a000) {
522 if ((int)(start_insn | ~0x1fff) < -128)
523 error("Found bogus save at the start of %s", name);
524 if (end_insn1 != 0x81c7e008 || end_insn2 != 0x81e80000)
525 error("ret; restore; not found at end of %s", name);
527 error("No save at the beginning of %s", name);
530 /* Skip a preceeding nop, if present. */
532 skip_insn = get32((uint32_t *)(p - 0x4));
533 if (skip_insn == 0x01000000)
537 copy_size = p - p_start;
542 uint32_t start_insn, end_insn1, end_insn2, skip_insn;
544 p = (void *)(p_end - 8);
546 error("empty code for %s", name);
547 start_insn = get32((uint32_t *)(p_start + 0x0));
548 end_insn1 = get32((uint32_t *)(p + 0x0));
549 end_insn2 = get32((uint32_t *)(p + 0x4));
550 if ((start_insn & ~0x1fff) == 0x9de3a000) {
553 if ((int)(start_insn | ~0x1fff) < -256)
554 error("Found bogus save at the start of %s", name);
555 if (end_insn1 != 0x81c7e008 || end_insn2 != 0x81e80000)
556 error("ret; restore; not found at end of %s", name);
558 error("No save at the beginning of %s", name);
561 /* Skip a preceeding nop, if present. */
563 skip_insn = get32((uint32_t *)(p - 0x4));
564 if (skip_insn == 0x01000000)
568 copy_size = p - p_start;
573 if ((p_end - p_start) <= 16)
574 error("%s: function too small", name);
575 if (get32((uint32_t *)p_start) != 0xe1a0c00d ||
576 (get32((uint32_t *)(p_start + 4)) & 0xffff0000) != 0xe92d0000 ||
577 get32((uint32_t *)(p_start + 8)) != 0xe24cb004)
578 error("%s: invalid prolog", name);
581 copy_size = arm_emit_ldr_info(name, start_offset, NULL, p_start, p_end,
588 p = (void *)(p_end - 2);
590 error("empty code for %s", name);
591 // remove NOP's, probably added for alignment
592 while ((get16((uint16_t *)p) == 0x4e71) &&
595 if (get16((uint16_t *)p) != 0x4e75)
596 error("rts expected at the end of %s", name);
597 copy_size = p - p_start;
601 error("unknown ELF architecture");
604 /* compute the number of arguments by looking at the relocations */
605 for(i = 0;i < MAX_ARGS; i++)
608 for(i = 0, rel = relocs;i < nb_relocs; i++, rel++) {
609 if (rel->r_offset >= start_offset &&
610 rel->r_offset < start_offset + (p_end - p_start)) {
611 sym_name = strtab + symtab[ELFW(R_SYM)(rel->r_info)].st_name;
612 if (strstart(sym_name, "__op_param", &p)) {
613 n = strtoul(p, NULL, 10);
615 error("too many arguments in %s", name);
616 args_present[n - 1] = 1;
622 while (nb_args < MAX_ARGS && args_present[nb_args])
624 for(i = nb_args; i < MAX_ARGS; i++) {
626 error("inconsistent argument numbering in %s", name);
629 if (gen_switch == 2) {
630 fprintf(outfile, "DEF(%s, %d, %d)\n", name + 3, nb_args, copy_size);
631 } else if (gen_switch == 1) {
634 fprintf(outfile, "case INDEX_%s: {\n", name);
636 fprintf(outfile, " long ");
637 for(i = 0; i < nb_args; i++) {
639 fprintf(outfile, ", ");
640 fprintf(outfile, "param%d", i + 1);
642 fprintf(outfile, ";\n");
644 fprintf(outfile, " extern void %s();\n", name);
646 for(i = 0, rel = relocs;i < nb_relocs; i++, rel++) {
647 if (rel->r_offset >= start_offset &&
648 rel->r_offset < start_offset + (p_end - p_start)) {
649 sym_name = strtab + symtab[ELFW(R_SYM)(rel->r_info)].st_name;
651 !strstart(sym_name, "__op_param", NULL) &&
652 !strstart(sym_name, "__op_jmp", NULL)) {
653 #if defined(HOST_SPARC)
654 if (sym_name[0] == '.') {
656 "extern char __dot_%s __asm__(\"%s\");\n",
657 sym_name+1, sym_name);
661 fprintf(outfile, "extern char %s;\n", sym_name);
666 fprintf(outfile, " memcpy(gen_code_ptr, (void *)((char *)&%s+%d), %d);\n", name, start_offset - offset, copy_size);
668 /* emit code offset information */
671 const char *sym_name, *p;
675 for(i = 0, sym = symtab; i < nb_syms; i++, sym++) {
676 sym_name = strtab + sym->st_name;
677 if (strstart(sym_name, "__op_label", &p)) {
679 unsigned long offset;
681 /* test if the variable refers to a label inside
682 the code we are generating */
683 ptr = sdata[sym->st_shndx];
685 error("__op_labelN in invalid section");
686 offset = sym->st_value;
687 val = *(unsigned long *)(ptr + offset);
688 #ifdef ELF_USES_RELOCA
690 int reloc_shndx, nb_relocs1, j;
692 /* try to find a matching relocation */
693 reloc_shndx = find_reloc(sym->st_shndx);
695 nb_relocs1 = shdr[reloc_shndx].sh_size /
696 shdr[reloc_shndx].sh_entsize;
697 rel = (ELF_RELOC *)sdata[reloc_shndx];
698 for(j = 0; j < nb_relocs1; j++) {
699 if (rel->r_offset == offset) {
709 if (val >= start_offset && val < start_offset + copy_size) {
710 n = strtol(p, NULL, 10);
711 fprintf(outfile, " label_offsets[%d] = %ld + (gen_code_ptr - gen_code_buf);\n", n, val - start_offset);
717 /* load parameres in variables */
718 for(i = 0; i < nb_args; i++) {
719 fprintf(outfile, " param%d = *opparam_ptr++;\n", i + 1);
722 /* patch relocations */
723 #if defined(HOST_I386)
728 for(i = 0, rel = relocs;i < nb_relocs; i++, rel++) {
729 if (rel->r_offset >= start_offset &&
730 rel->r_offset < start_offset + copy_size) {
731 sym_name = strtab + symtab[ELFW(R_SYM)(rel->r_info)].st_name;
732 if (strstart(sym_name, "__op_jmp", &p)) {
734 n = strtol(p, NULL, 10);
735 /* __op_jmp relocations are done at
736 runtime to do translated block
737 chaining: the offset of the instruction
738 needs to be stored */
739 fprintf(outfile, " jmp_offsets[%d] = %d + (gen_code_ptr - gen_code_buf);\n",
740 n, rel->r_offset - start_offset);
744 if (strstart(sym_name, "__op_param", &p)) {
745 snprintf(name, sizeof(name), "param%s", p);
747 snprintf(name, sizeof(name), "(long)(&%s)", sym_name);
749 type = ELF32_R_TYPE(rel->r_info);
750 addend = get32((uint32_t *)(text + rel->r_offset));
753 fprintf(outfile, " *(uint32_t *)(gen_code_ptr + %d) = %s + %d;\n",
754 rel->r_offset - start_offset, name, addend);
757 fprintf(outfile, " *(uint32_t *)(gen_code_ptr + %d) = %s - (long)(gen_code_ptr + %d) + %d;\n",
758 rel->r_offset - start_offset, name, rel->r_offset - start_offset, addend);
761 error("unsupported i386 relocation (%d)", type);
766 #elif defined(HOST_PPC)
771 for(i = 0, rel = relocs;i < nb_relocs; i++, rel++) {
772 if (rel->r_offset >= start_offset &&
773 rel->r_offset < start_offset + copy_size) {
774 sym_name = strtab + symtab[ELFW(R_SYM)(rel->r_info)].st_name;
775 if (strstart(sym_name, "__op_jmp", &p)) {
777 n = strtol(p, NULL, 10);
778 /* __op_jmp relocations are done at
779 runtime to do translated block
780 chaining: the offset of the instruction
781 needs to be stored */
782 fprintf(outfile, " jmp_offsets[%d] = %d + (gen_code_ptr - gen_code_buf);\n",
783 n, rel->r_offset - start_offset);
787 if (strstart(sym_name, "__op_param", &p)) {
788 snprintf(name, sizeof(name), "param%s", p);
790 snprintf(name, sizeof(name), "(long)(&%s)", sym_name);
792 type = ELF32_R_TYPE(rel->r_info);
793 addend = rel->r_addend;
796 fprintf(outfile, " *(uint32_t *)(gen_code_ptr + %d) = %s + %d;\n",
797 rel->r_offset - start_offset, name, addend);
799 case R_PPC_ADDR16_LO:
800 fprintf(outfile, " *(uint16_t *)(gen_code_ptr + %d) = (%s + %d);\n",
801 rel->r_offset - start_offset, name, addend);
803 case R_PPC_ADDR16_HI:
804 fprintf(outfile, " *(uint16_t *)(gen_code_ptr + %d) = (%s + %d) >> 16;\n",
805 rel->r_offset - start_offset, name, addend);
807 case R_PPC_ADDR16_HA:
808 fprintf(outfile, " *(uint16_t *)(gen_code_ptr + %d) = (%s + %d + 0x8000) >> 16;\n",
809 rel->r_offset - start_offset, name, addend);
812 /* warning: must be at 32 MB distancy */
813 fprintf(outfile, " *(uint32_t *)(gen_code_ptr + %d) = (*(uint32_t *)(gen_code_ptr + %d) & ~0x03fffffc) | ((%s - (long)(gen_code_ptr + %d) + %d) & 0x03fffffc);\n",
814 rel->r_offset - start_offset, rel->r_offset - start_offset, name, rel->r_offset - start_offset, addend);
817 error("unsupported powerpc relocation (%d)", type);
822 #elif defined(HOST_S390)
827 for(i = 0, rel = relocs;i < nb_relocs; i++, rel++) {
828 if (rel->r_offset >= start_offset &&
829 rel->r_offset < start_offset + copy_size) {
830 sym_name = strtab + symtab[ELFW(R_SYM)(rel->r_info)].st_name;
831 if (strstart(sym_name, "__op_param", &p)) {
832 snprintf(name, sizeof(name), "param%s", p);
834 snprintf(name, sizeof(name), "(long)(&%s)", sym_name);
836 type = ELF32_R_TYPE(rel->r_info);
837 addend = rel->r_addend;
840 fprintf(outfile, " *(uint32_t *)(gen_code_ptr + %d) = %s + %d;\n",
841 rel->r_offset - start_offset, name, addend);
844 fprintf(outfile, " *(uint16_t *)(gen_code_ptr + %d) = %s + %d;\n",
845 rel->r_offset - start_offset, name, addend);
848 fprintf(outfile, " *(uint8_t *)(gen_code_ptr + %d) = %s + %d;\n",
849 rel->r_offset - start_offset, name, addend);
852 error("unsupported s390 relocation (%d)", type);
857 #elif defined(HOST_ALPHA)
859 for (i = 0, rel = relocs; i < nb_relocs; i++, rel++) {
860 if (rel->r_offset >= start_offset && rel->r_offset < start_offset + copy_size) {
863 type = ELF64_R_TYPE(rel->r_info);
864 sym_name = strtab + symtab[ELF64_R_SYM(rel->r_info)].st_name;
867 /* The gp is just 32 bit, and never changes, so it's easiest to emit it
868 as an immediate instead of constructing it from the pv or ra. */
869 fprintf(outfile, " immediate_ldah(gen_code_ptr + %ld, gp);\n",
870 rel->r_offset - start_offset);
871 fprintf(outfile, " immediate_lda(gen_code_ptr + %ld, gp);\n",
872 rel->r_offset - start_offset + rel->r_addend);
875 /* jsr to literal hint. Could be used to optimize to bsr. Ignore for
876 now, since some called functions (libc) need pv to be set up. */
879 /* Branch target prediction hint. Ignore for now. Should be already
880 correct for in-function jumps. */
882 case R_ALPHA_LITERAL:
883 /* Load a literal from the GOT relative to the gp. Since there's only a
884 single gp, nothing is to be done. */
886 case R_ALPHA_GPRELHIGH:
887 /* Handle fake relocations against __op_param symbol. Need to emit the
888 high part of the immediate value instead. Other symbols need no
889 special treatment. */
890 if (strstart(sym_name, "__op_param", &p))
891 fprintf(outfile, " immediate_ldah(gen_code_ptr + %ld, param%s);\n",
892 rel->r_offset - start_offset, p);
894 case R_ALPHA_GPRELLOW:
895 if (strstart(sym_name, "__op_param", &p))
896 fprintf(outfile, " immediate_lda(gen_code_ptr + %ld, param%s);\n",
897 rel->r_offset - start_offset, p);
900 /* PC-relative jump. Tweak offset to skip the two instructions that try to
901 set up the gp from the pv. */
902 fprintf(outfile, " fix_bsr(gen_code_ptr + %ld, (uint8_t *) &%s - (gen_code_ptr + %ld + 4) + 8);\n",
903 rel->r_offset - start_offset, sym_name, rel->r_offset - start_offset);
906 error("unsupported Alpha relocation (%d)", type);
911 #elif defined(HOST_IA64)
916 for(i = 0, rel = relocs;i < nb_relocs; i++, rel++) {
917 if (rel->r_offset >= start_offset && rel->r_offset < start_offset + copy_size) {
918 sym_name = strtab + symtab[ELF64_R_SYM(rel->r_info)].st_name;
919 if (strstart(sym_name, "__op_param", &p)) {
920 snprintf(name, sizeof(name), "param%s", p);
922 snprintf(name, sizeof(name), "(long)(&%s)", sym_name);
924 type = ELF64_R_TYPE(rel->r_info);
925 addend = rel->r_addend;
928 error("must implemnt R_IA64_LTOFF22 relocation");
929 case R_IA64_PCREL21B:
930 error("must implemnt R_IA64_PCREL21B relocation");
932 error("unsupported ia64 relocation (%d)", type);
937 #elif defined(HOST_SPARC)
942 for(i = 0, rel = relocs;i < nb_relocs; i++, rel++) {
943 if (rel->r_offset >= start_offset &&
944 rel->r_offset < start_offset + copy_size) {
945 sym_name = strtab + symtab[ELF32_R_SYM(rel->r_info)].st_name;
946 if (strstart(sym_name, "__op_param", &p)) {
947 snprintf(name, sizeof(name), "param%s", p);
949 if (sym_name[0] == '.')
950 snprintf(name, sizeof(name),
954 snprintf(name, sizeof(name),
955 "(long)(&%s)", sym_name);
957 type = ELF32_R_TYPE(rel->r_info);
958 addend = rel->r_addend;
961 fprintf(outfile, " *(uint32_t *)(gen_code_ptr + %d) = %s + %d;\n",
962 rel->r_offset - start_offset, name, addend);
966 " *(uint32_t *)(gen_code_ptr + %d) = "
967 "((*(uint32_t *)(gen_code_ptr + %d)) "
969 " | (((%s + %d) >> 10) & 0x3fffff);\n",
970 rel->r_offset - start_offset,
971 rel->r_offset - start_offset,
976 " *(uint32_t *)(gen_code_ptr + %d) = "
977 "((*(uint32_t *)(gen_code_ptr + %d)) "
979 " | ((%s + %d) & 0x3ff);\n",
980 rel->r_offset - start_offset,
981 rel->r_offset - start_offset,
984 case R_SPARC_WDISP30:
986 " *(uint32_t *)(gen_code_ptr + %d) = "
987 "((*(uint32_t *)(gen_code_ptr + %d)) "
989 " | ((((%s + %d) - (long)(gen_code_ptr + %d))>>2) "
991 rel->r_offset - start_offset,
992 rel->r_offset - start_offset,
994 rel->r_offset - start_offset);
997 error("unsupported sparc relocation (%d)", type);
1002 #elif defined(HOST_SPARC64)
1007 for(i = 0, rel = relocs;i < nb_relocs; i++, rel++) {
1008 if (rel->r_offset >= start_offset &&
1009 rel->r_offset < start_offset + copy_size) {
1010 sym_name = strtab + symtab[ELF64_R_SYM(rel->r_info)].st_name;
1011 if (strstart(sym_name, "__op_param", &p)) {
1012 snprintf(name, sizeof(name), "param%s", p);
1014 snprintf(name, sizeof(name), "(long)(&%s)", sym_name);
1016 type = ELF64_R_TYPE(rel->r_info);
1017 addend = rel->r_addend;
1020 fprintf(outfile, " *(uint32_t *)(gen_code_ptr + %d) = %s + %d;\n",
1021 rel->r_offset - start_offset, name, addend);
1025 " *(uint32_t *)(gen_code_ptr + %d) = "
1026 "((*(uint32_t *)(gen_code_ptr + %d)) "
1028 " | (((%s + %d) >> 10) & 0x3fffff);\n",
1029 rel->r_offset - start_offset,
1030 rel->r_offset - start_offset,
1035 " *(uint32_t *)(gen_code_ptr + %d) = "
1036 "((*(uint32_t *)(gen_code_ptr + %d)) "
1038 " | ((%s + %d) & 0x3ff);\n",
1039 rel->r_offset - start_offset,
1040 rel->r_offset - start_offset,
1043 case R_SPARC_WDISP30:
1045 " *(uint32_t *)(gen_code_ptr + %d) = "
1046 "((*(uint32_t *)(gen_code_ptr + %d)) "
1048 " | ((((%s + %d) - (long)(gen_code_ptr + %d))>>2) "
1049 " & 0x3fffffff);\n",
1050 rel->r_offset - start_offset,
1051 rel->r_offset - start_offset,
1053 rel->r_offset - start_offset);
1056 error("unsupported sparc64 relocation (%d)", type);
1061 #elif defined(HOST_ARM)
1067 arm_emit_ldr_info(name, start_offset, outfile, p_start, p_end,
1070 for(i = 0, rel = relocs;i < nb_relocs; i++, rel++) {
1071 if (rel->r_offset >= start_offset &&
1072 rel->r_offset < start_offset + copy_size) {
1073 sym_name = strtab + symtab[ELFW(R_SYM)(rel->r_info)].st_name;
1074 /* the compiler leave some unnecessary references to the code */
1075 if (sym_name[0] == '\0')
1077 if (strstart(sym_name, "__op_param", &p)) {
1078 snprintf(name, sizeof(name), "param%s", p);
1080 snprintf(name, sizeof(name), "(long)(&%s)", sym_name);
1082 type = ELF32_R_TYPE(rel->r_info);
1083 addend = get32((uint32_t *)(text + rel->r_offset));
1086 fprintf(outfile, " *(uint32_t *)(gen_code_ptr + %d) = %s + %d;\n",
1087 rel->r_offset - start_offset, name, addend);
1090 fprintf(outfile, " arm_reloc_pc24((uint32_t *)(gen_code_ptr + %d), 0x%x, %s);\n",
1091 rel->r_offset - start_offset, addend, name);
1094 error("unsupported arm relocation (%d)", type);
1099 #elif defined(HOST_M68K)
1105 for(i = 0, rel = relocs;i < nb_relocs; i++, rel++) {
1106 if (rel->r_offset >= start_offset &&
1107 rel->r_offset < start_offset + copy_size) {
1108 sym = &(symtab[ELFW(R_SYM)(rel->r_info)]);
1109 sym_name = strtab + symtab[ELFW(R_SYM)(rel->r_info)].st_name;
1110 if (strstart(sym_name, "__op_param", &p)) {
1111 snprintf(name, sizeof(name), "param%s", p);
1113 snprintf(name, sizeof(name), "(long)(&%s)", sym_name);
1115 type = ELF32_R_TYPE(rel->r_info);
1116 addend = get32((uint32_t *)(text + rel->r_offset)) + rel->r_addend;
1119 fprintf(outfile, " /* R_68K_32 RELOC, offset %x */\n", rel->r_offset) ;
1120 fprintf(outfile, " *(uint32_t *)(gen_code_ptr + %d) = %s + %#x;\n",
1121 rel->r_offset - start_offset, name, addend );
1124 fprintf(outfile, " /* R_68K_PC32 RELOC, offset %x */\n", rel->r_offset);
1125 fprintf(outfile, " *(uint32_t *)(gen_code_ptr + %d) = %s - (long)(gen_code_ptr + %#x) + %#x;\n",
1126 rel->r_offset - start_offset, name, rel->r_offset - start_offset, /*sym->st_value+*/ addend);
1129 error("unsupported m68k relocation (%d)", type);
1135 #error unsupported CPU
1137 fprintf(outfile, " gen_code_ptr += %d;\n", copy_size);
1138 fprintf(outfile, "}\n");
1139 fprintf(outfile, "break;\n\n");
1141 fprintf(outfile, "static inline void gen_%s(", name);
1143 fprintf(outfile, "void");
1145 for(i = 0; i < nb_args; i++) {
1147 fprintf(outfile, ", ");
1148 fprintf(outfile, "long param%d", i + 1);
1151 fprintf(outfile, ")\n");
1152 fprintf(outfile, "{\n");
1153 for(i = 0; i < nb_args; i++) {
1154 fprintf(outfile, " *gen_opparam_ptr++ = param%d;\n", i + 1);
1156 fprintf(outfile, " *gen_opc_ptr++ = INDEX_%s;\n", name);
1157 fprintf(outfile, "}\n\n");
1161 /* load an elf object file */
1162 int load_elf(const char *filename, FILE *outfile, int out_type)
1165 struct elf_shdr *sec, *symtab_sec, *strtab_sec, *text_sec;
1174 fd = open(filename, O_RDONLY);
1176 error("can't open file '%s'", filename);
1178 /* Read ELF header. */
1179 if (read(fd, &ehdr, sizeof (ehdr)) != sizeof (ehdr))
1180 error("unable to read file header");
1182 /* Check ELF identification. */
1183 if (ehdr.e_ident[EI_MAG0] != ELFMAG0
1184 || ehdr.e_ident[EI_MAG1] != ELFMAG1
1185 || ehdr.e_ident[EI_MAG2] != ELFMAG2
1186 || ehdr.e_ident[EI_MAG3] != ELFMAG3
1187 || ehdr.e_ident[EI_VERSION] != EV_CURRENT) {
1188 error("bad ELF header");
1191 do_swap = elf_must_swap(&ehdr);
1193 elf_swap_ehdr(&ehdr);
1194 if (ehdr.e_ident[EI_CLASS] != ELF_CLASS)
1195 error("Unsupported ELF class");
1196 if (ehdr.e_type != ET_REL)
1197 error("ELF object file expected");
1198 if (ehdr.e_version != EV_CURRENT)
1199 error("Invalid ELF version");
1200 if (!elf_check_arch(ehdr.e_machine))
1201 error("Unsupported CPU (e_machine=%d)", ehdr.e_machine);
1203 /* read section headers */
1204 shdr = load_data(fd, ehdr.e_shoff, ehdr.e_shnum * sizeof(struct elf_shdr));
1206 for(i = 0; i < ehdr.e_shnum; i++) {
1207 elf_swap_shdr(&shdr[i]);
1211 /* read all section data */
1212 sdata = malloc(sizeof(void *) * ehdr.e_shnum);
1213 memset(sdata, 0, sizeof(void *) * ehdr.e_shnum);
1215 for(i = 0;i < ehdr.e_shnum; i++) {
1217 if (sec->sh_type != SHT_NOBITS)
1218 sdata[i] = load_data(fd, sec->sh_offset, sec->sh_size);
1221 sec = &shdr[ehdr.e_shstrndx];
1222 shstr = sdata[ehdr.e_shstrndx];
1224 /* swap relocations */
1225 for(i = 0; i < ehdr.e_shnum; i++) {
1227 if (sec->sh_type == SHT_RELOC) {
1228 nb_relocs = sec->sh_size / sec->sh_entsize;
1230 for(j = 0, rel = (ELF_RELOC *)sdata[i]; j < nb_relocs; j++, rel++)
1237 text_sec = find_elf_section(shdr, ehdr.e_shnum, shstr, ".text");
1239 error("could not find .text section");
1240 text_shndx = text_sec - shdr;
1241 text = sdata[text_shndx];
1243 /* find text relocations, if any */
1246 i = find_reloc(text_shndx);
1248 relocs = (ELF_RELOC *)sdata[i];
1249 nb_relocs = shdr[i].sh_size / shdr[i].sh_entsize;
1252 symtab_sec = find_elf_section(shdr, ehdr.e_shnum, shstr, ".symtab");
1254 error("could not find .symtab section");
1255 strtab_sec = &shdr[symtab_sec->sh_link];
1257 symtab = (ElfW(Sym) *)sdata[symtab_sec - shdr];
1258 strtab = sdata[symtab_sec->sh_link];
1260 nb_syms = symtab_sec->sh_size / sizeof(ElfW(Sym));
1262 for(i = 0, sym = symtab; i < nb_syms; i++, sym++) {
1263 swab32s(&sym->st_name);
1264 swabls(&sym->st_value);
1265 swabls(&sym->st_size);
1266 swab16s(&sym->st_shndx);
1270 if (out_type == OUT_INDEX_OP) {
1271 fprintf(outfile, "DEF(end, 0, 0)\n");
1272 fprintf(outfile, "DEF(nop, 0, 0)\n");
1273 fprintf(outfile, "DEF(nop1, 1, 0)\n");
1274 fprintf(outfile, "DEF(nop2, 2, 0)\n");
1275 fprintf(outfile, "DEF(nop3, 3, 0)\n");
1276 for(i = 0, sym = symtab; i < nb_syms; i++, sym++) {
1277 const char *name, *p;
1278 name = strtab + sym->st_name;
1279 if (strstart(name, OP_PREFIX, &p)) {
1280 gen_code(name, sym->st_value, sym->st_size, outfile,
1281 text, relocs, nb_relocs, 2);
1284 } else if (out_type == OUT_GEN_OP) {
1285 /* generate gen_xxx functions */
1287 for(i = 0, sym = symtab; i < nb_syms; i++, sym++) {
1289 name = strtab + sym->st_name;
1290 if (strstart(name, OP_PREFIX, NULL)) {
1291 if (sym->st_shndx != (text_sec - shdr))
1292 error("invalid section for opcode (0x%x)", sym->st_shndx);
1293 gen_code(name, sym->st_value, sym->st_size, outfile,
1294 text, relocs, nb_relocs, 0);
1299 /* generate big code generation switch */
1301 "int dyngen_code(uint8_t *gen_code_buf,\n"
1302 " uint16_t *label_offsets, uint16_t *jmp_offsets,\n"
1303 " const uint16_t *opc_buf, const uint32_t *opparam_buf)\n"
1305 " uint8_t *gen_code_ptr;\n"
1306 " const uint16_t *opc_ptr;\n"
1307 " const uint32_t *opparam_ptr;\n");
1311 " uint8_t *last_gen_code_ptr = gen_code_buf;\n"
1312 " LDREntry *arm_ldr_ptr = arm_ldr_table;\n"
1313 " uint32_t *arm_data_ptr = arm_data_table;\n");
1318 " gen_code_ptr = gen_code_buf;\n"
1319 " opc_ptr = opc_buf;\n"
1320 " opparam_ptr = opparam_buf;\n");
1322 /* Generate prologue, if needed. */
1326 " switch(*opc_ptr++) {\n"
1329 for(i = 0, sym = symtab; i < nb_syms; i++, sym++) {
1331 name = strtab + sym->st_name;
1332 if (strstart(name, OP_PREFIX, NULL)) {
1334 printf("%4d: %s pos=0x%08x len=%d\n",
1335 i, name, sym->st_value, sym->st_size);
1337 if (sym->st_shndx != (text_sec - shdr))
1338 error("invalid section for opcode (0x%x)", sym->st_shndx);
1339 gen_code(name, sym->st_value, sym->st_size, outfile,
1340 text, relocs, nb_relocs, 1);
1345 " case INDEX_op_nop:\n"
1347 " case INDEX_op_nop1:\n"
1350 " case INDEX_op_nop2:\n"
1351 " opparam_ptr += 2;\n"
1353 " case INDEX_op_nop3:\n"
1354 " opparam_ptr += 3;\n"
1361 /* generate constant table if needed */
1363 " if ((gen_code_ptr - last_gen_code_ptr) >= (MAX_FRAG_SIZE - MAX_OP_SIZE)) {\n"
1364 " gen_code_ptr = arm_flush_ldr(gen_code_ptr, arm_ldr_table, arm_ldr_ptr, arm_data_table, arm_data_ptr, 1);\n"
1365 " last_gen_code_ptr = gen_code_ptr;\n"
1366 " arm_ldr_ptr = arm_ldr_table;\n"
1367 " arm_data_ptr = arm_data_table;\n"
1377 /* generate some code patching */
1379 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");
1381 /* flush instruction cache */
1382 fprintf(outfile, "flush_icache_range((unsigned long)gen_code_buf, (unsigned long)gen_code_ptr);\n");
1384 fprintf(outfile, "return gen_code_ptr - gen_code_buf;\n");
1385 fprintf(outfile, "}\n\n");
1395 printf("dyngen (c) 2003 Fabrice Bellard\n"
1396 "usage: dyngen [-o outfile] [-c] objfile\n"
1397 "Generate a dynamic code generator from an object file\n"
1398 "-c output enum of operations\n"
1399 "-g output gen_op_xx() functions\n"
1404 int main(int argc, char **argv)
1407 const char *filename, *outfilename;
1410 outfilename = "out.c";
1411 out_type = OUT_CODE;
1413 c = getopt(argc, argv, "ho:cg");
1421 outfilename = optarg;
1424 out_type = OUT_INDEX_OP;
1427 out_type = OUT_GEN_OP;
1433 filename = argv[optind];
1434 outfile = fopen(outfilename, "w");
1436 error("could not open '%s'", outfilename);
1437 load_elf(filename, outfile, out_type);