diff options
Diffstat (limited to 'dyngen.c')
| -rw-r--r-- | dyngen.c | 1060 |
1 files changed, 706 insertions, 354 deletions
@@ -3,6 +3,9 @@ * * Copyright (c) 2003 Fabrice Bellard * + * The COFF object format support was extracted from Kazu's QEMU port + * to Win32. + * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or @@ -27,6 +30,14 @@ #include "config-host.h" +#if defined(_WIN32) +#define CONFIG_FORMAT_COFF +#else +#define CONFIG_FORMAT_ELF +#endif + +#ifdef CONFIG_FORMAT_ELF + /* elf format definitions. We use these macros to test the CPU to allow cross compilation (this tool must be ran on the build platform) */ @@ -122,6 +133,40 @@ typedef uint64_t host_ulong; #define SHT_RELOC SHT_REL #endif +#define EXE_RELOC ELF_RELOC +#define EXE_SYM ElfW(Sym) + +#endif /* CONFIG_FORMAT_ELF */ + +#ifdef CONFIG_FORMAT_COFF + +#include "a.out.h" + +typedef int32_t host_long; +typedef uint32_t host_ulong; + +#define FILENAMELEN 256 + +typedef struct coff_sym { + struct external_syment *st_syment; + char st_name[FILENAMELEN]; + uint32_t st_value; + int st_size; + uint8_t st_type; + uint8_t st_shndx; +} coff_Sym; + +typedef struct coff_rel { + struct external_reloc *r_reloc; + int r_offset; + uint8_t r_type; +} coff_Rel; + +#define EXE_RELOC struct coff_rel +#define EXE_SYM struct coff_sym + +#endif /* CONFIG_FORMAT_COFF */ + #include "bswap.h" enum { @@ -133,18 +178,67 @@ enum { /* all dynamically generated functions begin with this code */ #define OP_PREFIX "op_" -int elf_must_swap(struct elfhdr *h) +int do_swap; + +void __attribute__((noreturn)) __attribute__((format (printf, 1, 2))) error(const char *fmt, ...) { - union { - uint32_t i; - uint8_t b[4]; - } swaptest; + va_list ap; + va_start(ap, fmt); + fprintf(stderr, "dyngen: "); + vfprintf(stderr, fmt, ap); + fprintf(stderr, "\n"); + va_end(ap); + exit(1); +} - swaptest.i = 1; - return (h->e_ident[EI_DATA] == ELFDATA2MSB) != - (swaptest.b[0] == 0); +void *load_data(int fd, long offset, unsigned int size) +{ + char *data; + + data = malloc(size); + if (!data) + return NULL; + lseek(fd, offset, SEEK_SET); + if (read(fd, data, size) != size) { + free(data); + return NULL; + } + return data; } - + +int strstart(const char *str, const char *val, const char **ptr) +{ + const char *p, *q; + p = str; + q = val; + while (*q != '\0') { + if (*p != *q) + return 0; + p++; + q++; + } + if (ptr) + *ptr = p; + return 1; +} + +void pstrcpy(char *buf, int buf_size, const char *str) +{ + int c; + char *q = buf; + + if (buf_size <= 0) + return; + + for(;;) { + c = *str++; + if (c == 0 || q >= buf + buf_size - 1) + break; + *q++ = c; + } + *q = '\0'; +} + void swab16s(uint16_t *p) { *p = bswap16(*p); @@ -160,6 +254,66 @@ void swab64s(uint64_t *p) *p = bswap64(*p); } +uint16_t get16(uint16_t *p) +{ + uint16_t val; + val = *p; + if (do_swap) + val = bswap16(val); + return val; +} + +uint32_t get32(uint32_t *p) +{ + uint32_t val; + val = *p; + if (do_swap) + val = bswap32(val); + return val; +} + +void put16(uint16_t *p, uint16_t val) +{ + if (do_swap) + val = bswap16(val); + *p = val; +} + +void put32(uint32_t *p, uint32_t val) +{ + if (do_swap) + val = bswap32(val); + *p = val; +} + +/* executable information */ +EXE_SYM *symtab; +int nb_syms; +int text_shndx; +uint8_t *text; +EXE_RELOC *relocs; +int nb_relocs; + +#ifdef CONFIG_FORMAT_ELF + +/* ELF file info */ +struct elf_shdr *shdr; +uint8_t **sdata; +struct elfhdr ehdr; +char *strtab; + +int elf_must_swap(struct elfhdr *h) +{ + union { + uint32_t i; + uint8_t b[4]; + } swaptest; + + swaptest.i = 1; + return (h->e_ident[EI_DATA] == ELFDATA2MSB) != + (swaptest.b[0] == 0); +} + void elf_swap_ehdr(struct elfhdr *h) { swab16s(&h->e_type); /* Object file type */ @@ -212,122 +366,396 @@ void elf_swap_rel(ELF_RELOC *rel) #endif } -/* ELF file info */ -int do_swap; -struct elf_shdr *shdr; -uint8_t **sdata; -struct elfhdr ehdr; -ElfW(Sym) *symtab; -int nb_syms; -char *strtab; -int text_shndx; +struct elf_shdr *find_elf_section(struct elf_shdr *shdr, int shnum, const char *shstr, + const char *name) +{ + int i; + const char *shname; + struct elf_shdr *sec; -uint16_t get16(uint16_t *p) + for(i = 0; i < shnum; i++) { + sec = &shdr[i]; + if (!sec->sh_name) + continue; + shname = shstr + sec->sh_name; + if (!strcmp(shname, name)) + return sec; + } + return NULL; +} + +int find_reloc(int sh_index) { - uint16_t val; - val = *p; - if (do_swap) - val = bswap16(val); - return val; + struct elf_shdr *sec; + int i; + + for(i = 0; i < ehdr.e_shnum; i++) { + sec = &shdr[i]; + if (sec->sh_type == SHT_RELOC && sec->sh_info == sh_index) + return i; + } + return 0; } -uint32_t get32(uint32_t *p) +static char *get_rel_sym_name(EXE_RELOC *rel) { - uint32_t val; - val = *p; - if (do_swap) - val = bswap32(val); - return val; + return strtab + symtab[ELFW(R_SYM)(rel->r_info)].st_name; } -void put16(uint16_t *p, uint16_t val) +static char *get_sym_name(EXE_SYM *sym) { - if (do_swap) - val = bswap16(val); - *p = val; + return strtab + sym->st_name; } -void put32(uint32_t *p, uint32_t val) +/* load an elf object file */ +int load_object(const char *filename) { + int fd; + struct elf_shdr *sec, *symtab_sec, *strtab_sec, *text_sec; + int i, j; + ElfW(Sym) *sym; + char *shstr; + ELF_RELOC *rel; + + fd = open(filename, O_RDONLY); + if (fd < 0) + error("can't open file '%s'", filename); + + /* Read ELF header. */ + if (read(fd, &ehdr, sizeof (ehdr)) != sizeof (ehdr)) + error("unable to read file header"); + + /* Check ELF identification. */ + if (ehdr.e_ident[EI_MAG0] != ELFMAG0 + || ehdr.e_ident[EI_MAG1] != ELFMAG1 + || ehdr.e_ident[EI_MAG2] != ELFMAG2 + || ehdr.e_ident[EI_MAG3] != ELFMAG3 + || ehdr.e_ident[EI_VERSION] != EV_CURRENT) { + error("bad ELF header"); + } + + do_swap = elf_must_swap(&ehdr); if (do_swap) - val = bswap32(val); - *p = val; + elf_swap_ehdr(&ehdr); + if (ehdr.e_ident[EI_CLASS] != ELF_CLASS) + error("Unsupported ELF class"); + if (ehdr.e_type != ET_REL) + error("ELF object file expected"); + if (ehdr.e_version != EV_CURRENT) + error("Invalid ELF version"); + if (!elf_check_arch(ehdr.e_machine)) + error("Unsupported CPU (e_machine=%d)", ehdr.e_machine); + + /* read section headers */ + shdr = load_data(fd, ehdr.e_shoff, ehdr.e_shnum * sizeof(struct elf_shdr)); + if (do_swap) { + for(i = 0; i < ehdr.e_shnum; i++) { + elf_swap_shdr(&shdr[i]); + } + } + + /* read all section data */ + sdata = malloc(sizeof(void *) * ehdr.e_shnum); + memset(sdata, 0, sizeof(void *) * ehdr.e_shnum); + + for(i = 0;i < ehdr.e_shnum; i++) { + sec = &shdr[i]; + if (sec->sh_type != SHT_NOBITS) + sdata[i] = load_data(fd, sec->sh_offset, sec->sh_size); + } + + sec = &shdr[ehdr.e_shstrndx]; + shstr = sdata[ehdr.e_shstrndx]; + + /* swap relocations */ + for(i = 0; i < ehdr.e_shnum; i++) { + sec = &shdr[i]; + if (sec->sh_type == SHT_RELOC) { + nb_relocs = sec->sh_size / sec->sh_entsize; + if (do_swap) { + for(j = 0, rel = (ELF_RELOC *)sdata[i]; j < nb_relocs; j++, rel++) + elf_swap_rel(rel); + } + } + } + /* text section */ + + text_sec = find_elf_section(shdr, ehdr.e_shnum, shstr, ".text"); + if (!text_sec) + error("could not find .text section"); + text_shndx = text_sec - shdr; + text = sdata[text_shndx]; + + /* find text relocations, if any */ + relocs = NULL; + nb_relocs = 0; + i = find_reloc(text_shndx); + if (i != 0) { + relocs = (ELF_RELOC *)sdata[i]; + nb_relocs = shdr[i].sh_size / shdr[i].sh_entsize; + } + + symtab_sec = find_elf_section(shdr, ehdr.e_shnum, shstr, ".symtab"); + if (!symtab_sec) + error("could not find .symtab section"); + strtab_sec = &shdr[symtab_sec->sh_link]; + + symtab = (ElfW(Sym) *)sdata[symtab_sec - shdr]; + strtab = sdata[symtab_sec->sh_link]; + + nb_syms = symtab_sec->sh_size / sizeof(ElfW(Sym)); + if (do_swap) { + for(i = 0, sym = symtab; i < nb_syms; i++, sym++) { + swab32s(&sym->st_name); + swabls(&sym->st_value); + swabls(&sym->st_size); + swab16s(&sym->st_shndx); + } + } + close(fd); + return 0; } -void __attribute__((noreturn)) __attribute__((format (printf, 1, 2))) error(const char *fmt, ...) +#endif /* CONFIG_FORMAT_ELF */ + +#ifdef CONFIG_FORMAT_COFF + +/* COFF file info */ +struct external_scnhdr *shdr; +uint8_t **sdata; +struct external_filehdr fhdr; +struct external_syment *coff_symtab; +char *strtab; +int coff_text_shndx, coff_data_shndx; + +int data_shndx; + +#define STRTAB_SIZE 4 + +#define DIR32 0x06 +#define DISP32 0x14 + +#define T_FUNCTION 0x20 +#define C_EXTERNAL 2 + +void sym_ent_name(struct external_syment *ext_sym, EXE_SYM *sym) { - va_list ap; - va_start(ap, fmt); - fprintf(stderr, "dyngen: "); - vfprintf(stderr, fmt, ap); - fprintf(stderr, "\n"); - va_end(ap); - exit(1); + char *q; + int c, i, len; + + if (ext_sym->e.e.e_zeroes != 0) { + q = sym->st_name; + for(i = 0; i < 8; i++) { + c = ext_sym->e.e_name[i]; + if (c == '\0') + break; + *q++ = c; + } + *q = '\0'; + } else { + pstrcpy(sym->st_name, sizeof(sym->st_name), strtab + ext_sym->e.e.e_offset); + } + + /* now convert the name to a C name (suppress the leading '_') */ + if (sym->st_name[0] == '_') { + len = strlen(sym->st_name); + memmove(sym->st_name, sym->st_name + 1, len - 1); + sym->st_name[len - 1] = '\0'; + } } +char *name_for_dotdata(struct coff_rel *rel) +{ + int i; + struct coff_sym *sym; + uint32_t text_data; -struct elf_shdr *find_elf_section(struct elf_shdr *shdr, int shnum, const char *shstr, - const char *name) + text_data = *(uint32_t *)(text + rel->r_offset); + + for (i = 0, sym = symtab; i < nb_syms; i++, sym++) { + if (sym->st_syment->e_scnum == data_shndx && + text_data >= sym->st_value && + text_data < sym->st_value + sym->st_size) { + + return sym->st_name; + + } + } + return NULL; +} + +static char *get_sym_name(EXE_SYM *sym) +{ + return sym->st_name; +} + +static char *get_rel_sym_name(EXE_RELOC *rel) +{ + char *name; + name = get_sym_name(symtab + *(uint32_t *)(rel->r_reloc->r_symndx)); + if (!strcmp(name, ".data")) + name = name_for_dotdata(rel); + return name; +} + +struct external_scnhdr *find_coff_section(struct external_scnhdr *shdr, int shnum, const char *name) { int i; const char *shname; - struct elf_shdr *sec; + struct external_scnhdr *sec; for(i = 0; i < shnum; i++) { sec = &shdr[i]; - if (!sec->sh_name) + if (!sec->s_name) continue; - shname = shstr + sec->sh_name; + shname = sec->s_name; if (!strcmp(shname, name)) return sec; } return NULL; } -int find_reloc(int sh_index) +/* load a coff object file */ +int load_object(const char *filename) { - struct elf_shdr *sec; + int fd; + struct external_scnhdr *sec, *text_sec, *data_sec; int i; + struct external_syment *ext_sym; + struct external_reloc *coff_relocs; + struct external_reloc *ext_rel; + uint32_t *n_strtab; + EXE_SYM *sym; + EXE_RELOC *rel; + + fd = open(filename, O_RDONLY +#ifdef _WIN32 + | O_BINARY +#endif + ); + if (fd < 0) + error("can't open file '%s'", filename); + + /* Read COFF header. */ + if (read(fd, &fhdr, sizeof (fhdr)) != sizeof (fhdr)) + error("unable to read file header"); - for(i = 0; i < ehdr.e_shnum; i++) { + /* Check COFF identification. */ + if (fhdr.f_magic != I386MAGIC) { + error("bad COFF header"); + } + do_swap = 0; + + /* read section headers */ + shdr = load_data(fd, sizeof(struct external_filehdr) + fhdr.f_opthdr, fhdr.f_nscns * sizeof(struct external_scnhdr)); + + /* read all section data */ + sdata = malloc(sizeof(void *) * fhdr.f_nscns); + memset(sdata, 0, sizeof(void *) * fhdr.f_nscns); + + const char *p; + for(i = 0;i < fhdr.f_nscns; i++) { sec = &shdr[i]; - if (sec->sh_type == SHT_RELOC && sec->sh_info == sh_index) - return i; + if (!strstart(sec->s_name, ".bss", &p)) + sdata[i] = load_data(fd, sec->s_scnptr, sec->s_size); } - return 0; -} -void *load_data(int fd, long offset, unsigned int size) -{ - char *data; - data = malloc(size); - if (!data) - return NULL; - lseek(fd, offset, SEEK_SET); - if (read(fd, data, size) != size) { - free(data); - return NULL; + /* text section */ + text_sec = find_coff_section(shdr, fhdr.f_nscns, ".text"); + if (!text_sec) + error("could not find .text section"); + coff_text_shndx = text_sec - shdr; + text = sdata[coff_text_shndx]; + + /* data section */ + data_sec = find_coff_section(shdr, fhdr.f_nscns, ".data"); + if (!data_sec) + error("could not find .data section"); + coff_data_shndx = data_sec - shdr; + + coff_symtab = load_data(fd, fhdr.f_symptr, fhdr.f_nsyms*SYMESZ); + for (i = 0, ext_sym = coff_symtab; i < nb_syms; i++, ext_sym++) { + for(i=0;i<8;i++) + printf(" %02x", ((uint8_t *)ext_sym->e.e_name)[i]); + printf("\n"); } - return data; -} -int strstart(const char *str, const char *val, const char **ptr) -{ - const char *p, *q; - p = str; - q = val; - while (*q != '\0') { - if (*p != *q) - return 0; - p++; - q++; + + n_strtab = load_data(fd, (fhdr.f_symptr + fhdr.f_nsyms*SYMESZ), STRTAB_SIZE); + strtab = load_data(fd, (fhdr.f_symptr + fhdr.f_nsyms*SYMESZ), *n_strtab); + + nb_syms = fhdr.f_nsyms; + + for (i = 0, ext_sym = coff_symtab; i < nb_syms; i++, ext_sym++) { + if (strstart(ext_sym->e.e_name, ".text", NULL)) + text_shndx = ext_sym->e_scnum; + if (strstart(ext_sym->e.e_name, ".data", NULL)) + data_shndx = ext_sym->e_scnum; } - if (ptr) - *ptr = p; - return 1; + + /* set coff symbol */ + symtab = malloc(sizeof(struct coff_sym) * nb_syms); + + int aux_size, j; + for (i = 0, ext_sym = coff_symtab, sym = symtab; i < nb_syms; i++, ext_sym++, sym++) { + memset(sym, 0, sizeof(*sym)); + sym->st_syment = ext_sym; + sym_ent_name(ext_sym, sym); + sym->st_value = ext_sym->e_value; + + aux_size = *(int8_t *)ext_sym->e_numaux; + if (ext_sym->e_scnum == text_shndx && ext_sym->e_type == T_FUNCTION) { + for (j = aux_size + 1; j < nb_syms - i; j++) { + if ((ext_sym + j)->e_scnum == text_shndx && + (ext_sym + j)->e_type == T_FUNCTION ){ + sym->st_size = (ext_sym + j)->e_value - ext_sym->e_value; + break; + } else if (j == nb_syms - i - 1) { + sec = &shdr[coff_text_shndx]; + sym->st_size = sec->s_size - ext_sym->e_value; + break; + } + } + } else if (ext_sym->e_scnum == data_shndx && *(uint8_t *)ext_sym->e_sclass == C_EXTERNAL) { + for (j = aux_size + 1; j < nb_syms - i; j++) { + if ((ext_sym + j)->e_scnum == data_shndx) { + sym->st_size = (ext_sym + j)->e_value - ext_sym->e_value; + break; + } else if (j == nb_syms - i - 1) { + sec = &shdr[coff_data_shndx]; + sym->st_size = sec->s_size - ext_sym->e_value; + break; + } + } + } else { + sym->st_size = 0; + } + + sym->st_type = ext_sym->e_type; + sym->st_shndx = ext_sym->e_scnum; + } + + + /* find text relocations, if any */ + sec = &shdr[coff_text_shndx]; + coff_relocs = load_data(fd, sec->s_relptr, sec->s_nreloc*RELSZ); + nb_relocs = sec->s_nreloc; + + /* set coff relocation */ + relocs = malloc(sizeof(struct coff_rel) * nb_relocs); + for (i = 0, ext_rel = coff_relocs, rel = relocs; i < nb_relocs; + i++, ext_rel++, rel++) { + memset(rel, 0, sizeof(*rel)); + rel->r_reloc = ext_rel; + rel->r_offset = *(uint32_t *)ext_rel->r_vaddr; + rel->r_type = *(uint16_t *)ext_rel->r_type; + } + return 0; } +#endif /* CONFIG_FORMAT_COFF */ + #ifdef HOST_ARM int arm_emit_ldr_info(const char *name, unsigned long start_offset, @@ -385,7 +813,7 @@ int arm_emit_ldr_info(const char *name, unsigned long start_offset, relname[0] = '\0'; for(i = 0, rel = relocs;i < nb_relocs; i++, rel++) { if (rel->r_offset == (pc_offset + start_offset)) { - sym_name = strtab + symtab[ELFW(R_SYM)(rel->r_info)].st_name; + sym_name = get_rel_sym_name(rel); /* the compiler leave some unnecessary references to the code */ if (strstart(sym_name, "__op_param", &p)) { snprintf(relname, sizeof(relname), "param%s", p); @@ -432,8 +860,7 @@ int arm_emit_ldr_info(const char *name, unsigned long start_offset, /* generate op code */ void gen_code(const char *name, host_ulong offset, host_ulong size, - FILE *outfile, uint8_t *text, ELF_RELOC *relocs, int nb_relocs, - int gen_switch) + FILE *outfile, int gen_switch) { int copy_size = 0; uint8_t *p_start, *p_end; @@ -441,7 +868,7 @@ void gen_code(const char *name, host_ulong offset, host_ulong size, int nb_args, i, n; uint8_t args_present[MAX_ARGS]; const char *sym_name, *p; - ELF_RELOC *rel; + EXE_RELOC *rel; /* Compute exact size excluding prologue and epilogue instructions. * Increment start_offset to skip epilogue instructions, then compute @@ -451,136 +878,141 @@ void gen_code(const char *name, host_ulong offset, host_ulong size, p_start = text + offset; p_end = p_start + size; start_offset = offset; - switch(ELF_ARCH) { - case EM_386: - case EM_X86_64: - { - int len; - len = p_end - p_start; - if (len == 0) - error("empty code for %s", name); - if (p_end[-1] == 0xc3) { - len--; - } else { +#if defined(HOST_I386) || defined(HOST_AMD64) +#ifdef CONFIG_FORMAT_COFF + { + uint8_t *p; + p = p_end - 1; + if (p == p_start) + error("empty code for %s", name); + while (*p != 0xc3) { + p--; + if (p <= p_start) error("ret or jmp expected at the end of %s", name); - } - copy_size = len; } - break; - case EM_PPC: - { - uint8_t *p; - p = (void *)(p_end - 4); - if (p == p_start) - error("empty code for %s", name); - if (get32((uint32_t *)p) != 0x4e800020) - error("blr expected at the end of %s", name); - copy_size = p - p_start; + copy_size = p - p_start; + } +#else + { + int len; + len = p_end - p_start; + if (len == 0) + error("empty code for %s", name); + if (p_end[-1] == 0xc3) { + len--; + } else { + error("ret or jmp expected at the end of %s", name); } - break; - case EM_S390: - { - uint8_t *p; - p = (void *)(p_end - 2); - if (p == p_start) - error("empty code for %s", name); - if (get16((uint16_t *)p) != 0x07fe && get16((uint16_t *)p) != 0x07f4) - error("br %%r14 expected at the end of %s", name); - copy_size = p - p_start; - } - break; - case EM_ALPHA: - { - uint8_t *p; - p = p_end - 4; + copy_size = len; + } +#endif +#elif defined(HOST_PPC) + { + uint8_t *p; + p = (void *)(p_end - 4); + if (p == p_start) + error("empty code for %s", name); + if (get32((uint32_t *)p) != 0x4e800020) + error("blr expected at the end of %s", name); + copy_size = p - p_start; + } +#elif defined(HOST_S390) + { + uint8_t *p; + p = (void *)(p_end - 2); + if (p == p_start) + error("empty code for %s", name); + if (get16((uint16_t *)p) != 0x07fe && get16((uint16_t *)p) != 0x07f4) + error("br %%r14 expected at the end of %s", name); + copy_size = p - p_start; + } +#elif defined(HOST_ALPHA) + { + uint8_t *p; + p = p_end - 4; #if 0 - /* XXX: check why it occurs */ - if (p == p_start) - error("empty code for %s", name); + /* XXX: check why it occurs */ + if (p == p_start) + error("empty code for %s", name); #endif - if (get32((uint32_t *)p) != 0x6bfa8001) - error("ret expected at the end of %s", name); - copy_size = p - p_start; - } - break; - case EM_IA_64: - { - uint8_t *p; - p = (void *)(p_end - 4); - if (p == p_start) - error("empty code for %s", name); - /* br.ret.sptk.many b0;; */ - /* 08 00 84 00 */ - if (get32((uint32_t *)p) != 0x00840008) - error("br.ret.sptk.many b0;; expected at the end of %s", name); - copy_size = p - p_start; - } - break; - case EM_SPARC: - case EM_SPARC32PLUS: - { - uint32_t start_insn, end_insn1, end_insn2; - uint8_t *p; - p = (void *)(p_end - 8); - if (p <= p_start) - error("empty code for %s", name); - start_insn = get32((uint32_t *)(p_start + 0x0)); - end_insn1 = get32((uint32_t *)(p + 0x0)); - end_insn2 = get32((uint32_t *)(p + 0x4)); - if ((start_insn & ~0x1fff) == 0x9de3a000) { - p_start += 0x4; - start_offset += 0x4; - if ((int)(start_insn | ~0x1fff) < -128) - error("Found bogus save at the start of %s", name); - if (end_insn1 != 0x81c7e008 || end_insn2 != 0x81e80000) - error("ret; restore; not found at end of %s", name); - } else { - error("No save at the beginning of %s", name); - } + if (get32((uint32_t *)p) != 0x6bfa8001) + error("ret expected at the end of %s", name); + copy_size = p - p_start; + } +#elif defined(HOST_IA64) + { + uint8_t *p; + p = (void *)(p_end - 4); + if (p == p_start) + error("empty code for %s", name); + /* br.ret.sptk.many b0;; */ + /* 08 00 84 00 */ + if (get32((uint32_t *)p) != 0x00840008) + error("br.ret.sptk.many b0;; expected at the end of %s", name); + copy_size = p - p_start; + } +#elif defined(HOST_SPARC) + { + uint32_t start_insn, end_insn1, end_insn2; + uint8_t *p; + p = (void *)(p_end - 8); + if (p <= p_start) + error("empty code for %s", name); + start_insn = get32((uint32_t *)(p_start + 0x0)); + end_insn1 = get32((uint32_t *)(p + 0x0)); + end_insn2 = get32((uint32_t *)(p + 0x4)); + if ((start_insn & ~0x1fff) == 0x9de3a000) { + p_start += 0x4; + start_offset += 0x4; + if ((int)(start_insn | ~0x1fff) < -128) + error("Found bogus save at the start of %s", name); + if (end_insn1 != 0x81c7e008 || end_insn2 != 0x81e80000) + error("ret; restore; not found at end of %s", name); + } else { + error("No save at the beginning of %s", name); + } #if 0 - /* Skip a preceeding nop, if present. */ - if (p > p_start) { - skip_insn = get32((uint32_t *)(p - 0x4)); - if (skip_insn == 0x01000000) - p -= 4; - } + /* Skip a preceeding nop, if present. */ + if (p > p_start) { + skip_insn = get32((uint32_t *)(p - 0x4)); + if (skip_insn == 0x01000000) + p -= 4; + } #endif - copy_size = p - p_start; - } - break; - case EM_SPARCV9: - { - uint32_t start_insn, end_insn1, end_insn2, skip_insn; - uint8_t *p; - p = (void *)(p_end - 8); - if (p <= p_start) - error("empty code for %s", name); - start_insn = get32((uint32_t *)(p_start + 0x0)); - end_insn1 = get32((uint32_t *)(p + 0x0)); - end_insn2 = get32((uint32_t *)(p + 0x4)); - if ((start_insn & ~0x1fff) == 0x9de3a000) { - p_start += 0x4; - start_offset += 0x4; - if ((int)(start_insn | ~0x1fff) < -256) - error("Found bogus save at the start of %s", name); - if (end_insn1 != 0x81c7e008 || end_insn2 != 0x81e80000) - error("ret; restore; not found at end of %s", name); - } else { - error("No save at the beginning of %s", name); - } - - /* Skip a preceeding nop, if present. */ - if (p > p_start) { - skip_insn = get32((uint32_t *)(p - 0x4)); - if (skip_insn == 0x01000000) - p -= 4; - } - - copy_size = p - p_start; - } - break; -#ifdef HOST_ARM - case EM_ARM: + copy_size = p - p_start; + } +#elif defined(HOST_SPARC64) + { + uint32_t start_insn, end_insn1, end_insn2, skip_insn; + uint8_t *p; + p = (void *)(p_end - 8); + if (p <= p_start) + error("empty code for %s", name); + start_insn = get32((uint32_t *)(p_start + 0x0)); + end_insn1 = get32((uint32_t *)(p + 0x0)); + end_insn2 = get32((uint32_t *)(p + 0x4)); + if ((start_insn & ~0x1fff) == 0x9de3a000) { + p_start += 0x4; + start_offset += 0x4; + if ((int)(start_insn | ~0x1fff) < -256) + error("Found bogus save at the start of %s", name); + if (end_insn1 != 0x81c7e008 || end_insn2 != 0x81e80000) + error("ret; restore; not found at end of %s", name); + } else { + error("No save at the beginning of %s", name); + } + + /* Skip a preceeding nop, if present. */ + if (p > p_start) { + skip_insn = get32((uint32_t *)(p - 0x4)); + if (skip_insn == 0x01000000) + p -= 4; + } + + copy_size = p - p_start; + } +#elif defined(HOST_ARM) + { if ((p_end - p_start) <= 16) error("%s: function too small", name); if (get32((uint32_t *)p_start) != 0xe1a0c00d || @@ -591,26 +1023,24 @@ void gen_code(const char *name, host_ulong offset, host_ulong size, start_offset += 12; copy_size = arm_emit_ldr_info(name, start_offset, NULL, p_start, p_end, relocs, nb_relocs); - break; -#endif - case EM_68K: - { - uint8_t *p; - p = (void *)(p_end - 2); - if (p == p_start) - error("empty code for %s", name); - // remove NOP's, probably added for alignment - while ((get16((uint16_t *)p) == 0x4e71) && - (p>p_start)) - p -= 2; - if (get16((uint16_t *)p) != 0x4e75) - error("rts expected at the end of %s", name); - copy_size = p - p_start; - } - break; - default: - error("unknown ELF architecture"); } +#elif defined(HOST_M68K) + { + uint8_t *p; + p = (void *)(p_end - 2); + if (p == p_start) + error("empty code for %s", name); + // remove NOP's, probably added for alignment + while ((get16((uint16_t *)p) == 0x4e71) && + (p>p_start)) + p -= 2; + if (get16((uint16_t *)p) != 0x4e75) + error("rts expected at the end of %s", name); + copy_size = p - p_start; + } +#else +#error unsupported CPU +#endif /* compute the number of arguments by looking at the relocations */ for(i = 0;i < MAX_ARGS; i++) @@ -619,7 +1049,7 @@ void gen_code(const char *name, host_ulong offset, host_ulong size, for(i = 0, rel = relocs;i < nb_relocs; i++, rel++) { if (rel->r_offset >= start_offset && rel->r_offset < start_offset + (p_end - p_start)) { - sym_name = strtab + symtab[ELFW(R_SYM)(rel->r_info)].st_name; + sym_name = get_rel_sym_name(rel); if (strstart(sym_name, "__op_param", &p)) { n = strtoul(p, NULL, 10); if (n > MAX_ARGS) @@ -657,7 +1087,7 @@ void gen_code(const char *name, host_ulong offset, host_ulong size, for(i = 0, rel = relocs;i < nb_relocs; i++, rel++) { if (rel->r_offset >= start_offset && rel->r_offset < start_offset + (p_end - p_start)) { - sym_name = strtab + symtab[ELFW(R_SYM)(rel->r_info)].st_name; + sym_name = get_rel_sym_name(rel); if (*sym_name && !strstart(sym_name, "__op_param", NULL) && !strstart(sym_name, "__op_jmp", NULL)) { @@ -678,20 +1108,30 @@ void gen_code(const char *name, host_ulong offset, host_ulong size, /* emit code offset information */ { - ElfW(Sym) *sym; + EXE_SYM *sym; const char *sym_name, *p; unsigned long val; int n; for(i = 0, sym = symtab; i < nb_syms; i++, sym++) { - sym_name = strtab + sym->st_name; + sym_name = get_sym_name(sym); if (strstart(sym_name, "__op_label", &p)) { uint8_t *ptr; unsigned long offset; /* test if the variable refers to a label inside the code we are generating */ +#ifdef CONFIG_FORMAT_COFF + if (sym->st_shndx == text_shndx) { + ptr = sdata[coff_text_shndx]; + } else if (sym->st_shndx == data_shndx) { + ptr = sdata[coff_data_shndx]; + } else { + ptr = NULL; + } +#else ptr = sdata[sym->st_shndx]; +#endif if (!ptr) error("__op_labelN in invalid section"); offset = sym->st_value; @@ -739,7 +1179,7 @@ void gen_code(const char *name, host_ulong offset, host_ulong size, for(i = 0, rel = relocs;i < nb_relocs; i++, rel++) { if (rel->r_offset >= start_offset && rel->r_offset < start_offset + copy_size) { - sym_name = strtab + symtab[ELFW(R_SYM)(rel->r_info)].st_name; + sym_name = get_rel_sym_name(rel); if (strstart(sym_name, "__op_jmp", &p)) { int n; n = strtol(p, NULL, 10); @@ -757,8 +1197,9 @@ void gen_code(const char *name, host_ulong offset, host_ulong size, } else { snprintf(name, sizeof(name), "(long)(&%s)", sym_name); } - type = ELF32_R_TYPE(rel->r_info); addend = get32((uint32_t *)(text + rel->r_offset)); +#ifdef CONFIG_FORMAT_ELF + type = ELF32_R_TYPE(rel->r_info); switch(type) { case R_386_32: fprintf(outfile, " *(uint32_t *)(gen_code_ptr + %d) = %s + %d;\n", @@ -771,6 +1212,23 @@ void gen_code(const char *name, host_ulong offset, host_ulong size, default: error("unsupported i386 relocation (%d)", type); } +#elif defined(CONFIG_FORMAT_COFF) + type = rel->r_type; + switch(type) { + case DIR32: + fprintf(outfile, " *(uint32_t *)(gen_code_ptr + %d) = %s + %d;\n", + rel->r_offset - start_offset, name, addend); + break; + case DISP32: + fprintf(outfile, " *(uint32_t *)(gen_code_ptr + %d) = %s - (long)(gen_code_ptr + %d) + %d -4;\n", + rel->r_offset - start_offset, name, rel->r_offset - start_offset, addend); + break; + default: + error("unsupported i386 relocation (%d)", type); + } +#else +#error unsupport object format +#endif } } } @@ -1204,114 +1662,10 @@ void gen_code(const char *name, host_ulong offset, host_ulong size, } } -/* load an elf object file */ -int load_elf(const char *filename, FILE *outfile, int out_type) +int gen_file(FILE *outfile, int out_type) { - int fd; - struct elf_shdr *sec, *symtab_sec, *strtab_sec, *text_sec; - int i, j; - ElfW(Sym) *sym; - char *shstr; - uint8_t *text; - ELF_RELOC *relocs; - int nb_relocs; - ELF_RELOC *rel; - - fd = open(filename, O_RDONLY); - if (fd < 0) - error("can't open file '%s'", filename); - - /* Read ELF header. */ - if (read(fd, &ehdr, sizeof (ehdr)) != sizeof (ehdr)) - error("unable to read file header"); - - /* Check ELF identification. */ - if (ehdr.e_ident[EI_MAG0] != ELFMAG0 - || ehdr.e_ident[EI_MAG1] != ELFMAG1 - || ehdr.e_ident[EI_MAG2] != ELFMAG2 - || ehdr.e_ident[EI_MAG3] != ELFMAG3 - || ehdr.e_ident[EI_VERSION] != EV_CURRENT) { - error("bad ELF header"); - } - - do_swap = elf_must_swap(&ehdr); - if (do_swap) - elf_swap_ehdr(&ehdr); - if (ehdr.e_ident[EI_CLASS] != ELF_CLASS) - error("Unsupported ELF class"); - if (ehdr.e_type != ET_REL) - error("ELF object file expected"); - if (ehdr.e_version != EV_CURRENT) - error("Invalid ELF version"); - if (!elf_check_arch(ehdr.e_machine)) - error("Unsupported CPU (e_machine=%d)", ehdr.e_machine); - - /* read section headers */ - shdr = load_data(fd, ehdr.e_shoff, ehdr.e_shnum * sizeof(struct elf_shdr)); - if (do_swap) { - for(i = 0; i < ehdr.e_shnum; i++) { - elf_swap_shdr(&shdr[i]); - } - } - - /* read all section data */ - sdata = malloc(sizeof(void *) * ehdr.e_shnum); - memset(sdata, 0, sizeof(void *) * ehdr.e_shnum); - - for(i = 0;i < ehdr.e_shnum; i++) { - sec = &shdr[i]; - if (sec->sh_type != SHT_NOBITS) - sdata[i] = load_data(fd, sec->sh_offset, sec->sh_size); - } - - sec = &shdr[ehdr.e_shstrndx]; - shstr = sdata[ehdr.e_shstrndx]; - - /* swap relocations */ - for(i = 0; i < ehdr.e_shnum; i++) { - sec = &shdr[i]; - if (sec->sh_type == SHT_RELOC) { - nb_relocs = sec->sh_size / sec->sh_entsize; - if (do_swap) { - for(j = 0, rel = (ELF_RELOC *)sdata[i]; j < nb_relocs; j++, rel++) - elf_swap_rel(rel); - } - } - } - /* text section */ - - text_sec = find_elf_section(shdr, ehdr.e_shnum, shstr, ".text"); - if (!text_sec) - error("could not find .text section"); - text_shndx = text_sec - shdr; - text = sdata[text_shndx]; - - /* find text relocations, if any */ - relocs = NULL; - nb_relocs = 0; - i = find_reloc(text_shndx); - if (i != 0) { - relocs = (ELF_RELOC *)sdata[i]; - nb_relocs = shdr[i].sh_size / shdr[i].sh_entsize; - } - - symtab_sec = find_elf_section(shdr, ehdr.e_shnum, shstr, ".symtab"); - if (!symtab_sec) - error("could not find .symtab section"); - strtab_sec = &shdr[symtab_sec->sh_link]; - - symtab = (ElfW(Sym) *)sdata[symtab_sec - shdr]; - strtab = sdata[symtab_sec->sh_link]; - - nb_syms = symtab_sec->sh_size / sizeof(ElfW(Sym)); - if (do_swap) { - for(i = 0, sym = symtab; i < nb_syms; i++, sym++) { - swab32s(&sym->st_name); - swabls(&sym->st_value); - swabls(&sym->st_size); - swab16s(&sym->st_shndx); - } - } + int i; + EXE_SYM *sym; if (out_type == OUT_INDEX_OP) { fprintf(outfile, "DEF(end, 0, 0)\n"); @@ -1321,10 +1675,9 @@ int load_elf(const char *filename, FILE *outfile, int out_type) fprintf(outfile, "DEF(nop3, 3, 0)\n"); for(i = 0, sym = symtab; i < nb_syms; i++, sym++) { const char *name, *p; - name = strtab + sym->st_name; + name = get_sym_name(sym); if (strstart(name, OP_PREFIX, &p)) { - gen_code(name, sym->st_value, sym->st_size, outfile, - text, relocs, nb_relocs, 2); + gen_code(name, sym->st_value, sym->st_size, outfile, 2); } } } else if (out_type == OUT_GEN_OP) { @@ -1332,12 +1685,11 @@ int load_elf(const char *filename, FILE *outfile, int out_type) for(i = 0, sym = symtab; i < nb_syms; i++, sym++) { const char *name; - name = strtab + sym->st_name; + name = get_sym_name(sym); if (strstart(name, OP_PREFIX, NULL)) { - if (sym->st_shndx != (text_sec - shdr)) + if (sym->st_shndx != text_shndx) error("invalid section for opcode (0x%x)", sym->st_shndx); - gen_code(name, sym->st_value, sym->st_size, outfile, - text, relocs, nb_relocs, 0); + gen_code(name, sym->st_value, sym->st_size, outfile, 0); } } @@ -1374,16 +1726,15 @@ fprintf(outfile, for(i = 0, sym = symtab; i < nb_syms; i++, sym++) { const char *name; - name = strtab + sym->st_name; + name = get_sym_name(sym); if (strstart(name, OP_PREFIX, NULL)) { #if 0 printf("%4d: %s pos=0x%08x len=%d\n", i, name, sym->st_value, sym->st_size); #endif - if (sym->st_shndx != (text_sec - shdr)) + if (sym->st_shndx != text_shndx) error("invalid section for opcode (0x%x)", sym->st_shndx); - gen_code(name, sym->st_value, sym->st_size, outfile, - text, relocs, nb_relocs, 1); + gen_code(name, sym->st_value, sym->st_size, outfile, 1); } } @@ -1432,7 +1783,6 @@ fprintf(outfile, "gen_code_ptr = arm_flush_ldr(gen_code_ptr, arm_ldr_table, arm_ } - close(fd); return 0; } @@ -1480,7 +1830,9 @@ int main(int argc, char **argv) outfile = fopen(outfilename, "w"); if (!outfile) error("could not open '%s'", outfilename); - load_elf(filename, outfile, out_type); + + load_object(filename); + gen_file(outfile, out_type); fclose(outfile); return 0; } |