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dyngen.c
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/*
* Generic Dynamic compiler generator
*
* Copyright (c) 2003 Fabrice Bellard
*
* The COFF object format support was extracted from Kazu's QEMU port
* to Win32.
*
* Mach-O Support by Matt Reda and Pierre d'Herbemont
*
* 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
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <stdarg.h>
#include <inttypes.h>
#include <unistd.h>
#include <fcntl.h>
#include "config-host.h"
/* NOTE: we test CONFIG_WIN32 instead of _WIN32 to enabled cross
compilation */
#if defined(CONFIG_WIN32)
#define CONFIG_FORMAT_COFF
#elif defined(CONFIG_DARWIN)
#define CONFIG_FORMAT_MACH
#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) */
#if defined(HOST_I386)
#define ELF_CLASS ELFCLASS32
#define ELF_ARCH EM_386
#define elf_check_arch(x) ( ((x) == EM_386) || ((x) == EM_486) )
#undef ELF_USES_RELOCA
#elif defined(HOST_X86_64)
#define ELF_CLASS ELFCLASS64
#define ELF_ARCH EM_X86_64
#define elf_check_arch(x) ((x) == EM_X86_64)
#define ELF_USES_RELOCA
#elif defined(HOST_PPC)
#define ELF_CLASS ELFCLASS32
#define ELF_ARCH EM_PPC
#define elf_check_arch(x) ((x) == EM_PPC)
#define ELF_USES_RELOCA
#elif defined(HOST_S390)
#define ELF_CLASS ELFCLASS32
#define ELF_ARCH EM_S390
#define elf_check_arch(x) ((x) == EM_S390)
#define ELF_USES_RELOCA
#elif defined(HOST_ALPHA)
#define ELF_CLASS ELFCLASS64
#define ELF_ARCH EM_ALPHA
#define elf_check_arch(x) ((x) == EM_ALPHA)
#define ELF_USES_RELOCA
#elif defined(HOST_IA64)
#define ELF_CLASS ELFCLASS64
#define ELF_ARCH EM_IA_64
#define elf_check_arch(x) ((x) == EM_IA_64)
#define ELF_USES_RELOCA
#elif defined(HOST_SPARC)
#define ELF_CLASS ELFCLASS32
#define ELF_ARCH EM_SPARC
#define elf_check_arch(x) ((x) == EM_SPARC || (x) == EM_SPARC32PLUS)
#define ELF_USES_RELOCA
#elif defined(HOST_SPARC64)
#define ELF_CLASS ELFCLASS64
#define ELF_ARCH EM_SPARCV9
#define elf_check_arch(x) ((x) == EM_SPARCV9)
#define ELF_USES_RELOCA
#elif defined(HOST_ARM)
#define ELF_CLASS ELFCLASS32
#define ELF_ARCH EM_ARM
#define elf_check_arch(x) ((x) == EM_ARM)
#define ELF_USES_RELOC
#elif defined(HOST_M68K)
#define ELF_CLASS ELFCLASS32
#define ELF_ARCH EM_68K
#define elf_check_arch(x) ((x) == EM_68K)
#define ELF_USES_RELOCA
#else
#error unsupported CPU - please update the code
#endif
#include "elf.h"
#if ELF_CLASS == ELFCLASS32
typedef int32_t host_long;
typedef uint32_t host_ulong;
#define swabls(x) swab32s(x)
#else
typedef int64_t host_long;
typedef uint64_t host_ulong;
#define swabls(x) swab64s(x)
#endif
#ifdef ELF_USES_RELOCA
#define SHT_RELOC SHT_RELA
#else
#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 */
#ifdef CONFIG_FORMAT_MACH
#include <mach-o/loader.h>
#include <mach-o/nlist.h>
#include <mach-o/reloc.h>
#include <mach-o/ppc/reloc.h>
# define check_mach_header(x) (x.magic == MH_MAGIC)
typedef int32_t host_long;
typedef uint32_t host_ulong;
struct nlist_extended
{
union {
char *n_name;
long n_strx;
} n_un;
unsigned char n_type;
unsigned char n_sect;
short st_desc;
unsigned long st_value;
unsigned long st_size;
};
#define EXE_RELOC struct relocation_info
#define EXE_SYM struct nlist_extended
#endif /* CONFIG_FORMAT_MACH */
#include "bswap.h"
enum {
OUT_GEN_OP,
OUT_CODE,
OUT_INDEX_OP,
};
/* all dynamically generated functions begin with this code */
#define OP_PREFIX "op_"
int do_swap;
void __attribute__((noreturn)) __attribute__((format (printf, 1, 2))) error(const char *fmt, ...)
{
va_list ap;
va_start(ap, fmt);
fprintf(stderr, "dyngen: ");
vfprintf(stderr, fmt, ap);
fprintf(stderr, "\n");
va_end(ap);
exit(1);
}
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);
}
void swab32s(uint32_t *p)
{
*p = bswap32(*p);
}
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 */
swab16s(&h-> e_machine); /* Architecture */
swab32s(&h-> e_version); /* Object file version */
swabls(&h-> e_entry); /* Entry point virtual address */
swabls(&h-> e_phoff); /* Program header table file offset */
swabls(&h-> e_shoff); /* Section header table file offset */
swab32s(&h-> e_flags); /* Processor-specific flags */
swab16s(&h-> e_ehsize); /* ELF header size in bytes */
swab16s(&h-> e_phentsize); /* Program header table entry size */
swab16s(&h-> e_phnum); /* Program header table entry count */
swab16s(&h-> e_shentsize); /* Section header table entry size */
swab16s(&h-> e_shnum); /* Section header table entry count */
swab16s(&h-> e_shstrndx); /* Section header string table index */
}
void elf_swap_shdr(struct elf_shdr *h)
{
swab32s(&h-> sh_name); /* Section name (string tbl index) */
swab32s(&h-> sh_type); /* Section type */
swabls(&h-> sh_flags); /* Section flags */
swabls(&h-> sh_addr); /* Section virtual addr at execution */
swabls(&h-> sh_offset); /* Section file offset */
swabls(&h-> sh_size); /* Section size in bytes */
swab32s(&h-> sh_link); /* Link to another section */
swab32s(&h-> sh_info); /* Additional section information */
swabls(&h-> sh_addralign); /* Section alignment */
swabls(&h-> sh_entsize); /* Entry size if section holds table */
}
void elf_swap_phdr(struct elf_phdr *h)
{
swab32s(&h->p_type); /* Segment type */
swabls(&h->p_offset); /* Segment file offset */
swabls(&h->p_vaddr); /* Segment virtual address */
swabls(&h->p_paddr); /* Segment physical address */
swabls(&h->p_filesz); /* Segment size in file */
swabls(&h->p_memsz); /* Segment size in memory */
swab32s(&h->p_flags); /* Segment flags */
swabls(&h->p_align); /* Segment alignment */
}
void elf_swap_rel(ELF_RELOC *rel)
{
swabls(&rel->r_offset);
swabls(&rel->r_info);
#ifdef ELF_USES_RELOCA
swabls(&rel->r_addend);
#endif
}
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;
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)
{
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;
}
static host_ulong get_rel_offset(EXE_RELOC *rel)
{
return rel->r_offset;
}
static char *get_rel_sym_name(EXE_RELOC *rel)
{
return strtab + symtab[ELFW(R_SYM)(rel->r_info)].st_name;
}
static char *get_sym_name(EXE_SYM *sym)
{
return strtab + sym->st_name;
}
/* 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)
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;
}
#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)
{
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;
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);
if (name[0] == '.')
return NULL;
return name;
}
static host_ulong get_rel_offset(EXE_RELOC *rel)
{
return rel->r_offset;
}
struct external_scnhdr *find_coff_section(struct external_scnhdr *shdr, int shnum, const char *name)
{
int i;
const char *shname;
struct external_scnhdr *sec;
for(i = 0; i < shnum; i++) {
sec = &shdr[i];
if (!sec->s_name)
continue;
shname = sec->s_name;
if (!strcmp(shname, name))
return sec;
}
return NULL;
}
/* load a coff object file */
int load_object(const char *filename)
{
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");
/* 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 (!strstart(sec->s_name, ".bss", &p))
sdata[i] = load_data(fd, sec->s_scnptr, sec->s_size);
}
/* 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");
}
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;
}
/* 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 CONFIG_FORMAT_MACH
/* File Header */
struct mach_header mach_hdr;
/* commands */
struct segment_command *segment = 0;
struct dysymtab_command *dysymtabcmd = 0;
struct symtab_command *symtabcmd = 0;
/* section */
struct section *section_hdr;
struct section *text_sec_hdr;
uint8_t **sdata;
/* relocs */
struct relocation_info *relocs;
/* symbols */
EXE_SYM *symtab;
struct nlist *symtab_std;
char *strtab;
/* indirect symbols */
uint32_t *tocdylib;
/* Utility functions */
static inline char *find_str_by_index(int index)
{
return strtab+index;
}
/* Used by dyngen common code */
static char *get_sym_name(EXE_SYM *sym)
{
char *name = find_str_by_index(sym->n_un.n_strx);
if ( sym->n_type & N_STAB ) /* Debug symbols are ignored */
return "debug";
if(!name)
return name;
if(name[0]=='_')
return name + 1;
else
return name;
}
/* find a section index given its segname, sectname */
static int find_mach_sec_index(struct section *section_hdr, int shnum, const char *segname,
const char *sectname)
{
int i;
struct section *sec = section_hdr;
for(i = 0; i < shnum; i++, sec++) {
if (!sec->segname || !sec->sectname)
continue;
if (!strcmp(sec->sectname, sectname) && !strcmp(sec->segname, segname))
return i;
}
return -1;
}
/* find a section header given its segname, sectname */
struct section *find_mach_sec_hdr(struct section *section_hdr, int shnum, const char *segname,
const char *sectname)
{
int index = find_mach_sec_index(section_hdr, shnum, segname, sectname);
if(index == -1)
return NULL;
return section_hdr+index;
}
static inline void fetch_next_pair_value(struct relocation_info * rel, unsigned int *value)
{
struct scattered_relocation_info * scarel;
if(R_SCATTERED & rel->r_address) {
scarel = (struct scattered_relocation_info*)rel;
if(scarel->r_type != PPC_RELOC_PAIR)
error("fetch_next_pair_value: looking for a pair which was not found (1)");
*value = scarel->r_value;
} else {
if(rel->r_type != PPC_RELOC_PAIR)
error("fetch_next_pair_value: looking for a pair which was not found (2)");
*value = rel->r_address;
}
}
/* find a sym name given its value, in a section number */
static const char * find_sym_with_value_and_sec_number( int value, int sectnum, int * offset )
{
int i, ret = -1;
for( i = 0 ; i < nb_syms; i++ )
{
if( !(symtab[i].n_type & N_STAB) && (symtab[i].n_type & N_SECT) &&
(symtab[i].n_sect == sectnum) && (symtab[i].st_value <= value) )
{
if( (ret<0) || (symtab[i].st_value >= symtab[ret].st_value) )
ret = i;
}
}
if( ret < 0 ) {
*offset = 0;
return 0;
} else {
*offset = value - symtab[ret].st_value;
return get_sym_name(&symtab[ret]);
}
}
/*
* Find symbol name given a (virtual) address, and a section which is of type
* S_NON_LAZY_SYMBOL_POINTERS or S_LAZY_SYMBOL_POINTERS or S_SYMBOL_STUBS
*/
static const char * find_reloc_name_in_sec_ptr(int address, struct section * sec_hdr)
{
unsigned int tocindex, symindex, size;
const char *name = 0;
/* Sanity check */
if(!( address >= sec_hdr->addr && address < (sec_hdr->addr + sec_hdr->size) ) )
return (char*)0;
if( sec_hdr->flags & S_SYMBOL_STUBS ){
size = sec_hdr->reserved2;
if(size == 0)
error("size = 0");
}
else if( sec_hdr->flags & S_LAZY_SYMBOL_POINTERS ||
sec_hdr->flags & S_NON_LAZY_SYMBOL_POINTERS)
size = sizeof(unsigned long);
else
return 0;
/* Compute our index in toc */
tocindex = (address - sec_hdr->addr)/size;
symindex = tocdylib[sec_hdr->reserved1 + tocindex];
name = get_sym_name(&symtab[symindex]);
return name;
}
static const char * find_reloc_name_given_its_address(int address)
{
unsigned int i;
for(i = 0; i < segment->nsects ; i++)
{
const char * name = find_reloc_name_in_sec_ptr(address, §ion_hdr[i]);
if((long)name != -1)
return name;
}
return 0;
}
static const char * get_reloc_name(EXE_RELOC * rel, int * sslide)
{
char * name = 0;
struct scattered_relocation_info * sca_rel = (struct scattered_relocation_info*)rel;
int sectnum = rel->r_symbolnum;
int sectoffset;
int other_half=0;
/* init the slide value */
*sslide = 0;
if(R_SCATTERED & rel->r_address)
return (char *)find_reloc_name_given_its_address(sca_rel->r_value);
if(rel->r_extern)
{
/* ignore debug sym */
if ( symtab[rel->r_symbolnum].n_type & N_STAB )
return 0;
return get_sym_name(&symtab[rel->r_symbolnum]);
}
/* Intruction contains an offset to the symbols pointed to, in the rel->r_symbolnum section */
sectoffset = *(uint32_t *)(text + rel->r_address) & 0xffff;
if(sectnum==0xffffff)
return 0;
/* Sanity Check */
if(sectnum > segment->nsects)
error("sectnum > segment->nsects");
switch(rel->r_type)
{