+++ /dev/null
-/* vi: set sw=4 ts=4: */
-/*
- * A small little readelf implementation for uClibc
- *
- * Copyright (C) 2000-2006 Erik Andersen <andersen@uclibc.org>
- *
- * Several functions in this file (specifically, elf_find_section_type(),
- * elf_find_phdr_type(), and elf_find_dynamic(), were stolen from elflib.c from
- * elfvector (http://www.BitWagon.com/elfvector.html) by John F. Reiser
- * <jreiser@BitWagon.com>, which is copyright 2000 BitWagon Software LLC
- * (GPL2).
- *
- * Licensed under GPLv2 or later
- */
-
-#include "porting.h"
-
-static int byteswap;
-static __inline__ uint32_t byteswap32_to_host(uint32_t value)
-{
- if (byteswap==1) {
- return(bswap_32(value));
- } else {
- return(value);
- }
-}
-static __inline__ uint64_t byteswap64_to_host(uint64_t value)
-{
- if (byteswap==1) {
- return(bswap_64(value));
- } else {
- return(value);
- }
-}
-#if __WORDSIZE == 64
-# define byteswap_to_host(x) byteswap64_to_host(x)
-#else
-# define byteswap_to_host(x) byteswap32_to_host(x)
-#endif
-
-static ElfW(Shdr) * elf_find_section_type( uint32_t key, ElfW(Ehdr) *ehdr)
-{
- int j;
- ElfW(Shdr) *shdr = (ElfW(Shdr) *)(ehdr->e_shoff + (char *)ehdr);
- for (j = ehdr->e_shnum; --j>=0; ++shdr) {
- if (key==byteswap32_to_host(shdr->sh_type)) {
- return shdr;
- }
- }
- return NULL;
-}
-
-static ElfW(Phdr) * elf_find_phdr_type( uint32_t type, ElfW(Ehdr) *ehdr)
-{
- int j;
- ElfW(Phdr) *phdr = (ElfW(Phdr) *)(ehdr->e_phoff + (char *)ehdr);
- for (j = ehdr->e_phnum; --j>=0; ++phdr) {
- if (type==byteswap32_to_host(phdr->p_type)) {
- return phdr;
- }
- }
- return NULL;
-}
-
-/* Returns value if return_val==1, ptr otherwise */
-static void * elf_find_dynamic( int64_t const key, ElfW(Dyn) *dynp,
- ElfW(Ehdr) *ehdr, int return_val)
-{
- ElfW(Phdr) *pt_text = elf_find_phdr_type(PT_LOAD, ehdr);
- ElfW(Addr) tx_reloc = byteswap_to_host(pt_text->p_vaddr) - byteswap_to_host(pt_text->p_offset);
- for (; DT_NULL!=byteswap_to_host(dynp->d_tag); ++dynp) {
- if (key == byteswap_to_host(dynp->d_tag)) {
- if (return_val == 1)
- return (void *)byteswap_to_host(dynp->d_un.d_val);
- else
- return (void *)(byteswap_to_host(dynp->d_un.d_val) - tx_reloc + (char *)ehdr );
- }
- }
- return NULL;
-}
-
-static int check_elf_header(ElfW(Ehdr) *const ehdr)
-{
- if (!ehdr || *(uint32_t*)ehdr != ELFMAG_U32
- || (ehdr->e_ident[EI_CLASS] != ELFCLASS32
- && ehdr->e_ident[EI_CLASS] != ELFCLASS64)
- || ehdr->e_ident[EI_VERSION] != EV_CURRENT
- ) {
- return 1;
- }
-
- /* Check if the target endianness matches the host's endianness */
- byteswap = 0;
- if (UCLIBC_ENDIAN_HOST == UCLIBC_ENDIAN_LITTLE) {
- if (ehdr->e_ident[5] == ELFDATA2MSB)
- byteswap = 1;
- } else if (UCLIBC_ENDIAN_HOST == UCLIBC_ENDIAN_BIG) {
- if (ehdr->e_ident[5] == ELFDATA2LSB)
- byteswap = 1;
- }
- /* Be very lazy, and only byteswap the stuff we use */
- if (byteswap) {
- ehdr->e_type = bswap_16(ehdr->e_type);
- ehdr->e_machine = bswap_16(ehdr->e_machine);
- ehdr->e_phoff = byteswap_to_host(ehdr->e_phoff);
- ehdr->e_shoff = byteswap_to_host(ehdr->e_shoff);
- ehdr->e_phnum = bswap_16(ehdr->e_phnum);
- ehdr->e_shnum = bswap_16(ehdr->e_shnum);
- }
- return 0;
-}
-
-
-static void describe_elf_hdr(ElfW(Ehdr)* ehdr)
-{
- char *tmp, *tmp1;
-
- switch (ehdr->e_type) {
- case ET_NONE: tmp = "None"; tmp1 = "NONE"; break;
- case ET_REL: tmp = "Relocatable File"; tmp1 = "REL"; break;
- case ET_EXEC: tmp = "Executable file"; tmp1 = "EXEC"; break;
- case ET_DYN: tmp = "Shared object file"; tmp1 = "DYN"; break;
- case ET_CORE: tmp = "Core file"; tmp1 = "CORE"; break;
- default:
- tmp = tmp1 = "Unknown";
- }
- printf( "Type:\t\t%s (%s)\n", tmp1, tmp);
-
- switch (ehdr->e_machine) {
- case EM_NONE: tmp="No machine"; break;
- case EM_M32: tmp="AT&T WE 32100"; break;
- case EM_SPARC: tmp="SUN SPARC"; break;
- case EM_386: tmp="Intel 80386"; break;
- case EM_68K: tmp="Motorola m68k family"; break;
- case EM_88K: tmp="Motorola m88k family"; break;
- case EM_486: tmp="Intel 80486"; break;
- case EM_860: tmp="Intel 80860"; break;
- case EM_MIPS: tmp="MIPS R3000 big-endian"; break;
- case EM_S370: tmp="IBM System/370"; break;
- case EM_MIPS_RS3_LE: tmp="MIPS R3000 little-endian"; break;
- case EM_OLD_SPARCV9: tmp="Sparc v9 (old)"; break;
- case EM_PARISC: tmp="HPPA"; break;
- /*case EM_PPC_OLD: tmp="Power PC (old)"; break; conflicts with EM_VPP500 */
- case EM_SPARC32PLUS: tmp="Sun's v8plus"; break;
- case EM_960: tmp="Intel 80960"; break;
- case EM_PPC: tmp="PowerPC"; break;
- case EM_PPC64: tmp="PowerPC 64-bit"; break;
- case EM_V800: tmp="NEC V800 series"; break;
- case EM_FR20: tmp="Fujitsu FR20"; break;
- case EM_RH32: tmp="TRW RH-32"; break;
- case EM_MCORE: tmp="MCORE"; break;
- case EM_ARM: tmp="ARM"; break;
- case EM_FAKE_ALPHA: tmp="Digital Alpha"; break;
- case EM_SH: tmp="Renesas SH"; break;
- case EM_SPARCV9: tmp="SPARC v9 64-bit"; break;
- case EM_TRICORE: tmp="Siemens Tricore"; break;
- case EM_ARC: tmp="Argonaut RISC Core"; break;
- case EM_H8_300: tmp="Renesas H8/300"; break;
- case EM_H8_300H: tmp="Renesas H8/300H"; break;
- case EM_H8S: tmp="Renesas H8S"; break;
- case EM_H8_500: tmp="Renesas H8/500"; break;
- case EM_IA_64: tmp="Intel Merced"; break;
- case EM_MIPS_X: tmp="Stanford MIPS-X"; break;
- case EM_COLDFIRE: tmp="Motorola Coldfire"; break;
- case EM_68HC12: tmp="Motorola M68HC12"; break;
- case EM_ALPHA: tmp="Alpha"; break;
- case EM_CYGNUS_D10V:
- case EM_D10V: tmp="Mitsubishi D10V"; break;
- case EM_CYGNUS_D30V:
- case EM_D30V: tmp="Mitsubishi D30V"; break;
- case EM_CYGNUS_M32R:
- case EM_M32R: tmp="Renesas M32R (formerly Mitsubishi M32r)"; break;
- case EM_CYGNUS_V850:
- case EM_V850: tmp="NEC v850"; break;
- case EM_CYGNUS_MN10300:
- case EM_MN10300: tmp="Matsushita MN10300"; break;
- case EM_CYGNUS_MN10200:
- case EM_MN10200: tmp="Matsushita MN10200"; break;
- case EM_CYGNUS_FR30:
- case EM_FR30: tmp="Fujitsu FR30"; break;
- case EM_CYGNUS_FRV:
- case EM_PJ_OLD:
- case EM_PJ: tmp="picoJava"; break;
- case EM_MMA: tmp="Fujitsu MMA Multimedia Accelerator"; break;
- case EM_PCP: tmp="Siemens PCP"; break;
- case EM_NCPU: tmp="Sony nCPU embeeded RISC"; break;
- case EM_NDR1: tmp="Denso NDR1 microprocessor"; break;
- case EM_STARCORE: tmp="Motorola Start*Core processor"; break;
- case EM_ME16: tmp="Toyota ME16 processor"; break;
- case EM_ST100: tmp="STMicroelectronic ST100 processor"; break;
- case EM_TINYJ: tmp="Advanced Logic Corp. Tinyj emb.fam"; break;
- case EM_FX66: tmp="Siemens FX66 microcontroller"; break;
- case EM_ST9PLUS: tmp="STMicroelectronics ST9+ 8/16 mc"; break;
- case EM_ST7: tmp="STmicroelectronics ST7 8 bit mc"; break;
- case EM_68HC16: tmp="Motorola MC68HC16 microcontroller"; break;
- case EM_68HC11: tmp="Motorola MC68HC11 microcontroller"; break;
- case EM_68HC08: tmp="Motorola MC68HC08 microcontroller"; break;
- case EM_68HC05: tmp="Motorola MC68HC05 microcontroller"; break;
- case EM_SVX: tmp="Silicon Graphics SVx"; break;
- case EM_ST19: tmp="STMicroelectronics ST19 8 bit mc"; break;
- case EM_VAX: tmp="Digital VAX"; break;
- case EM_AVR_OLD:
- case EM_AVR: tmp="Atmel AVR 8-bit microcontroller"; break;
- case EM_CRIS: tmp="Axis Communications 32-bit embedded processor"; break;
- case EM_JAVELIN: tmp="Infineon Technologies 32-bit embedded processor"; break;
- case EM_FIREPATH: tmp="Element 14 64-bit DSP Processor"; break;
- case EM_ZSP: tmp="LSI Logic 16-bit DSP Processor"; break;
- case EM_MMIX: tmp="Donald Knuth's educational 64-bit processor"; break;
- case EM_HUANY: tmp="Harvard University machine-independent object files"; break;
- case EM_PRISM: tmp="SiTera Prism"; break;
- case EM_X86_64: tmp="AMD x86-64 architecture"; break;
- case EM_S390_OLD:
- case EM_S390: tmp="IBM S390"; break;
- case EM_XSTORMY16: tmp="Sanyo Xstormy16 CPU core"; break;
- case EM_OPENRISC:
- case EM_OR32: tmp="OpenRISC"; break;
- case EM_CRX: tmp="National Semiconductor CRX microprocessor"; break;
- case EM_DLX: tmp="OpenDLX"; break;
- case EM_IP2K_OLD:
- case EM_IP2K: tmp="Ubicom IP2xxx 8-bit microcontrollers"; break;
- case EM_IQ2000: tmp="Vitesse IQ2000"; break;
- case EM_XTENSA_OLD:
- case EM_XTENSA: tmp="Tensilica Xtensa Processor"; break;
- case EM_M32C: tmp="Renesas M32c"; break;
- case EM_MT: tmp="Morpho Techologies MT processor"; break;
- case EM_BLACKFIN: tmp="Analog Devices Blackfin"; break;
- case EM_NIOS32: tmp="Altera Nios 32"; break;
- case EM_ALTERA_NIOS2: tmp="Altera Nios II"; break;
- case EM_VPP500: tmp="Fujitsu VPP500"; break;
- case EM_PDSP: tmp="Sony DSP Processor"; break;
- default: tmp="unknown";
- }
- printf( "Machine:\t%s\n", tmp);
-
- switch (ehdr->e_ident[EI_CLASS]) {
- case ELFCLASSNONE: tmp = "Invalid class"; break;
- case ELFCLASS32: tmp = "ELF32"; break;
- case ELFCLASS64: tmp = "ELF64"; break;
- default: tmp = "Unknown";
- }
- printf( "Class:\t\t%s\n", tmp);
-
- switch (ehdr->e_ident[EI_DATA]) {
- case ELFDATANONE: tmp = "Invalid data encoding"; break;
- case ELFDATA2LSB: tmp = "2's complement, little endian"; break;
- case ELFDATA2MSB: tmp = "2's complement, big endian"; break;
- default: tmp = "Unknown";
- }
- printf( "Data:\t\t%s\n", tmp);
-
- printf( "Version:\t%d %s\n", ehdr->e_ident[EI_VERSION],
- (ehdr->e_ident[EI_VERSION]==EV_CURRENT)?
- "(current)" : "(unknown: %lx)");
-
- switch (ehdr->e_ident[EI_OSABI]) {
- case ELFOSABI_SYSV: tmp ="UNIX - System V"; break;
- case ELFOSABI_HPUX: tmp ="UNIX - HP-UX"; break;
- case ELFOSABI_NETBSD: tmp ="UNIX - NetBSD"; break;
- case ELFOSABI_LINUX: tmp ="UNIX - Linux"; break;
- case ELFOSABI_HURD: tmp ="GNU/Hurd"; break;
- case ELFOSABI_SOLARIS: tmp ="UNIX - Solaris"; break;
- case ELFOSABI_AIX: tmp ="UNIX - AIX"; break;
- case ELFOSABI_IRIX: tmp ="UNIX - IRIX"; break;
- case ELFOSABI_FREEBSD: tmp ="UNIX - FreeBSD"; break;
- case ELFOSABI_TRU64: tmp ="UNIX - TRU64"; break;
- case ELFOSABI_MODESTO: tmp ="Novell - Modesto"; break;
- case ELFOSABI_OPENBSD: tmp ="UNIX - OpenBSD"; break;
- case ELFOSABI_STANDALONE: tmp ="Standalone App"; break;
- case ELFOSABI_ARM: tmp ="ARM"; break;
- default: tmp = "Unknown";
- }
- printf( "OS/ABI:\t\t%s\n", tmp);
-
- printf( "ABI Version:\t%d\n", ehdr->e_ident[EI_ABIVERSION]);
-}
-
-static void list_needed_libraries(ElfW(Dyn)* dynamic, char *strtab)
-{
- ElfW(Dyn) *dyns;
-
- printf("Dependancies:\n");
- for (dyns=dynamic; byteswap_to_host(dyns->d_tag)!=DT_NULL; ++dyns) {
- if (dyns->d_tag == DT_NEEDED) {
- printf("\t%s\n", (char*)strtab + byteswap_to_host(dyns->d_un.d_val));
- }
- }
-}
-
-static void describe_elf_interpreter(ElfW(Ehdr)* ehdr)
-{
- ElfW(Phdr) *phdr;
- phdr = elf_find_phdr_type(PT_INTERP, ehdr);
- if (phdr) {
- printf("Interpreter:\t%s\n", (char*)ehdr + byteswap_to_host(phdr->p_offset));
- }
-}
-
-int main( int argc, char** argv)
-{
- /* map the .so, and locate interesting pieces */
- char *dynstr;
- char *thefilename = argv[1];
- FILE *thefile;
- struct stat statbuf;
- ElfW(Ehdr) *ehdr = 0;
- ElfW(Shdr) *dynsec;
- ElfW(Dyn) *dynamic;
-
- if (argc < 2 || !thefilename) {
- fprintf(stderr, "No filename specified.\n");
- exit(EXIT_FAILURE);
- }
- if (!(thefile = fopen(thefilename, "r"))) {
- perror(thefilename);
- exit(EXIT_FAILURE);
- }
- if (fstat(fileno(thefile), &statbuf) < 0) {
- perror(thefilename);
- exit(EXIT_FAILURE);
- }
-
- if ((size_t)statbuf.st_size < sizeof(ElfW(Ehdr)))
- goto foo;
-
- /* mmap the file to make reading stuff from it effortless */
- ehdr = (ElfW(Ehdr) *)mmap(0, statbuf.st_size,
- PROT_READ|PROT_WRITE, MAP_PRIVATE, fileno(thefile), 0);
-
-foo:
- /* Check if this looks legit */
- if (check_elf_header(ehdr)) {
- fprintf(stderr, "This does not appear to be an ELF file.\n");
- exit(EXIT_FAILURE);
- }
- describe_elf_hdr(ehdr);
- describe_elf_interpreter(ehdr);
-
- dynsec = elf_find_section_type(SHT_DYNAMIC, ehdr);
- if (dynsec) {
- dynamic = (ElfW(Dyn)*)(byteswap_to_host(dynsec->sh_offset) + (char *)ehdr);
- dynstr = (char *)elf_find_dynamic(DT_STRTAB, dynamic, ehdr, 0);
- list_needed_libraries(dynamic, dynstr);
- }
-
- return 0;
-}
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