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664 lines
21 KiB
664 lines
21 KiB
/* readelf.c - display information about ELF files.
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*
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* Copyright 2019 The Android Open Source Project
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*
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* See http://pubs.opengroup.org/onlinepubs/9699919799/utilities/nm.html
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USE_READELF(NEWTOY(readelf, "<1(dyn-syms)adehlnp:SsWx:", TOYFLAG_USR|TOYFLAG_BIN))
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config READELF
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bool "readelf"
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default n
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help
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usage: readelf [-adehlnSs] [-p SECTION] [-x SECTION] [file...]
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Displays information about ELF files.
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-a Equivalent to -dhlnSs
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-d Show dynamic section
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-e Headers (equivalent to -hlS)
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-h Show ELF header
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-l Show program headers
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-n Show notes
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-p S Dump strings found in named/numbered section
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-S Show section headers
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-s Show symbol tables (.dynsym and .symtab)
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-x S Hex dump of named/numbered section
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--dyn-syms Show just .dynsym symbol table
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*/
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#define FOR_readelf
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#include "toys.h"
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GLOBALS(
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char *x, *p;
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char *elf, *shstrtab, *f;
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unsigned long long shoff, phoff, size, shstrtabsz;
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int bits, endian, shnum, shentsize, phentsize;
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)
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// Section header.
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struct sh {
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unsigned type, link, info;
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unsigned long long flags, addr, offset, size, addralign, entsize;
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char *name;
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};
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// Program header.
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struct ph {
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unsigned type, flags;
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unsigned long long offset, vaddr, paddr, filesz, memsz, align;
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};
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static long long elf_get(char **p, int len)
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{
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long long result = ((TT.endian == 2) ? peek_be : peek_le)(*p, len);
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*p += len;
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return result;
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}
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static unsigned long long elf_long(char **p)
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{
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return elf_get(p, 4*(TT.bits+1));
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}
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static unsigned elf_int(char **p)
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{
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return elf_get(p, 4);
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}
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static unsigned short elf_short(char **p)
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{
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return elf_get(p, 2);
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}
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static int get_sh(unsigned i, struct sh *s)
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{
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char *shdr = TT.elf+TT.shoff+i*TT.shentsize;
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unsigned name_offset;
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if (i >= TT.shnum || shdr > TT.elf+TT.size-TT.shentsize) {
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printf("No shdr %d\n", i);
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return 0;
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}
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name_offset = elf_int(&shdr);
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s->type = elf_int(&shdr);
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s->flags = elf_long(&shdr);
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s->addr = elf_long(&shdr);
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s->offset = elf_long(&shdr);
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s->size = elf_long(&shdr);
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s->link = elf_int(&shdr);
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s->info = elf_int(&shdr);
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s->addralign = elf_long(&shdr);
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s->entsize = elf_long(&shdr);
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if (s->type != 8) {
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if (s->offset>TT.size || s->size>TT.size || s->offset>TT.size-s->size) {
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printf("Bad offset/size %llu/%llu for sh %d\n", s->offset, s->size, i);
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return 0;
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}
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}
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if (!TT.shstrtab) s->name = "?";
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else {
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s->name = TT.shstrtab + name_offset;
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if (name_offset > TT.shstrtabsz || s->name >= TT.elf+TT.size) {
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printf("Bad name for sh %d\n", i);
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return 0;
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}
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}
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return 1;
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}
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static int find_section(char *spec, struct sh *s)
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{
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char *end;
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int i;
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// Valid section number?
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errno = 0;
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i = strtoul(spec, &end, 0);
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if (!errno && !*end && i < TT.shnum) return get_sh(i, s);
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// Search the section names.
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for (i=0; i<TT.shnum; i++) {
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if (get_sh(i, s) && !strcmp(s->name, spec)) return 1;
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}
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error_msg("%s: no section '%s", TT.f, spec);
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return 0;
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}
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static int get_ph(int i, struct ph *ph)
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{
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char *phdr = TT.elf+TT.phoff+i*TT.phentsize;
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if (phdr > TT.elf+TT.size-TT.phentsize) {
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printf("Bad phdr %d\n", i);
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return 0;
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}
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// Elf64_Phdr reordered fields.
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ph->type = elf_int(&phdr);
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if (TT.bits) {
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ph->flags = elf_int(&phdr);
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ph->offset = elf_long(&phdr);
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ph->vaddr = elf_long(&phdr);
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ph->paddr = elf_long(&phdr);
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ph->filesz = elf_long(&phdr);
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ph->memsz = elf_long(&phdr);
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ph->align = elf_long(&phdr);
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} else {
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ph->offset = elf_int(&phdr);
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ph->vaddr = elf_int(&phdr);
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ph->paddr = elf_int(&phdr);
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ph->filesz = elf_int(&phdr);
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ph->memsz = elf_int(&phdr);
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ph->flags = elf_int(&phdr);
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ph->align = elf_int(&phdr);
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}
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if (ph->offset >= TT.size-ph->filesz) {
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printf("phdr %d has bad offset/size %llu/%llu", i, ph->offset, ph->filesz);
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return 0;
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}
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return 1;
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}
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#define MAP(...) __VA_ARGS__
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#define DECODER(name, values) \
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static char *name(int type) { \
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static char unknown[20]; \
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struct {int v; char *s;} a[] = values; \
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int i; \
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\
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for (i=0; i<ARRAY_LEN(a); i++) if (type==a[i].v) return a[i].s; \
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sprintf(unknown, "0x%x", type); \
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return unknown; \
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}
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DECODER(dt_type, MAP({{0,"x(NULL)"},{1,"N(NEEDED)"},{2,"b(PLTRELSZ)"},
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{3,"x(PLTGOT)"},{4,"x(HASH)"},{5,"x(STRTAB)"},{6,"x(SYMTAB)"},{7,"x(RELA)"},
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{8,"b(RELASZ)"},{9,"b(RELAENT)"},{10,"b(STRSZ)"},{11,"b(SYMENT)"},
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{12,"x(INIT)"},{13,"x(FINI)"},{14,"S(SONAME)"},{15,"R(RPATH)"},
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{16,"x(SYMBOLIC)"},{17,"x(REL)"},{18,"b(RELSZ)"},{19,"b(RELENT)"},
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{20,"P(PLTREL)"},{21,"x(DEBUG)"},{22,"x(TEXTREL)"},{23,"x(JMPREL)"},
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{24,"d(BIND_NOW)"},{25,"x(INIT_ARRAY)"},{26,"x(FINI_ARRAY)"},
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{27,"b(INIT_ARRAYSZ)"},{28,"b(FINI_ARRAYSZ)"},{29,"R(RUNPATH)"},
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{30,"f(FLAGS)"},{32,"x(PREINIT_ARRAY)"},{33,"x(PREINIT_ARRAYSZ)"},
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{35,"b(RELRSZ)"},{36,"x(RELR)"},{37,"b(RELRENT)"},
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{0x6000000f,"x(ANDROID_REL)"},{0x60000010,"b(ANDROID_RELSZ)"},
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{0x60000011,"x(ANDROID_RELA)"},{0x60000012,"b(ANDROID_RELASZ)"},
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{0x6fffe000,"x(ANDROID_RELR)"},{0x6fffe001,"b(ANDROID_RELRSZ)"},
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{0x6fffe003,"x(ANDROID_RELRENT)"},{0x6ffffef5,"x(GNU_HASH)"},
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{0x6ffffef6,"x(TLSDESC_PLT)"},{0x6ffffef7,"x(TLSDESC_GOT)"},
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{0x6ffffff0,"x(VERSYM)"},{0x6ffffff9,"d(RELACOUNT)"},
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{0x6ffffffa,"d(RELCOUNT)"},{0x6ffffffb,"F(FLAGS_1)"},
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{0x6ffffffc," (VERDEF)"},{0x6ffffffd,"d(VERDEFNUM)"},
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{0x6ffffffe,"x(VERNEED)"},{0x6fffffff,"d(VERNEEDNUM)"}}))
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DECODER(et_type, MAP({{0,"NONE (None)"},{1,"REL (Relocatable file)"},
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{2,"EXEC (Executable file)"},{3,"DYN (Shared object file)"},
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{4,"CORE (Core file)"}}))
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DECODER(nt_type_core, MAP({{1,"NT_PRSTATUS"},{2,"NT_FPREGSET"},
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{3,"NT_PRPSINFO"},{5,"NT_PLATFORM"},{6,"NT_AUXV"},
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{0x46494c45,"NT_FILE"},{0x53494749,"NT_SIGINFO"}}))
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DECODER(nt_type_linux, MAP({{0x200,"NT_386_TLS"},{0x202, "NT_X86_XSTATE"},
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{0x400,"NT_ARM_VFP"},{0x401,"NT_ARM_TLS"},{0x405,"NT_ARM_SVE"}}))
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DECODER(os_abi, MAP({{0,"UNIX - System V"}}))
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DECODER(ph_type, MAP({{0,"NULL"},{1,"LOAD"},{2,"DYNAMIC"},{3,"INTERP"},
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{4,"NOTE"},{5,"SHLIB"},{6,"PHDR"},{7,"TLS"},{0x6474e550,"GNU_EH_FRAME"},
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{0x6474e551,"GNU_STACK"},{0x6474e552,"GNU_RELRO"},{0x70000001,"EXIDX"}}))
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DECODER(sh_type, MAP({{0,"NULL"},{1,"PROGBITS"},{2,"SYMTAB"},{3,"STRTAB"},
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{4,"RELA"},{5,"HASH"},{6,"DYNAMIC"},{7,"NOTE"},{8,"NOBITS"},{9,"REL"},
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{10,"SHLIB"},{11,"DYNSYM"},{14,"INIT_ARRAY"},{15,"FINI_ARRAY"},
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{16,"PREINIT_ARRAY"},{17,"GROUP"},{18,"SYMTAB_SHNDX"},{19,"RELR"},
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{0x60000001,"ANDROID_REL"},{0x60000002,"ANDROID_RELA"},
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{0x6fffff00,"ANDROID_RELR"},{0x6ffffff6,"GNU_HASH"},
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{0x6ffffffd,"VERDEF"},{0x6ffffffe,"VERNEED"},
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{0x6fffffff,"VERSYM"},{0x70000001,"ARM_EXIDX"},
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{0x70000003,"ARM_ATTRIBUTES"}}))
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DECODER(stb_type, MAP({{0,"LOCAL"},{1,"GLOBAL"},{2,"WEAK"}}))
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DECODER(stt_type, MAP({{0,"NOTYPE"},{1,"OBJECT"},{2,"FUNC"},{3,"SECTION"},
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{4,"FILE"},{5,"COMMON"},{6,"TLS"},{10,"GNU_IFUNC"}}))
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DECODER(stv_type, MAP({{0,"DEFAULT"},{1,"INTERNAL"},{2,"HIDDEN"},
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{3,"PROTECTED"}}))
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static void show_symbols(struct sh *table, struct sh *strtab)
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{
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char *symtab = TT.elf+table->offset, *ndx;
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int numsym = table->size/(TT.bits ? 24 : 16), i;
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if (numsym == 0) return;
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xputc('\n');
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printf("Symbol table '%s' contains %d entries:\n"
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" Num: %*s Size Type Bind Vis Ndx Name\n",
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table->name, numsym, 5+8*TT.bits, "Value");
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for (i=0; i<numsym; i++) {
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unsigned st_name = elf_int(&symtab), st_value, st_shndx;
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unsigned char st_info, st_other;
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unsigned long st_size;
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char *name;
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// The various fields were moved around for 64-bit.
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if (TT.bits) {
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st_info = *symtab++;
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st_other = *symtab++;
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st_shndx = elf_short(&symtab);
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st_value = elf_long(&symtab);
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st_size = elf_long(&symtab);
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} else {
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st_value = elf_int(&symtab);
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st_size = elf_int(&symtab);
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st_info = *symtab++;
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st_other = *symtab++;
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st_shndx = elf_short(&symtab);
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}
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name = TT.elf + strtab->offset + st_name;
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if (name >= TT.elf+TT.size) name = "???";
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if (!st_shndx) ndx = "UND";
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else if (st_shndx==0xfff1) ndx = "ABS";
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else sprintf(ndx = toybuf, "%d", st_shndx);
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// TODO: look up and show any symbol versions with @ or @@.
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printf("%6d: %0*x %5lu %-7s %-6s %-9s%3s %s\n", i, 8*(TT.bits+1),
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st_value, st_size, stt_type(st_info & 0xf), stb_type(st_info >> 4),
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stv_type(st_other & 3), ndx, name);
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}
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}
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static int notematch(int namesz, char **p, char *expected, int len)
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{
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if (namesz != len || memcmp(*p, expected, namesz)) return 0;
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*p += namesz;
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return 1;
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}
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static void show_notes(unsigned long offset, unsigned long size)
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{
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char *note = TT.elf + offset;
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if (size > TT.size || offset > TT.size-size) {
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printf("Bad note bounds %lu/%lu\n", offset, size);
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return;
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}
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printf(" %-20s %10s\tDescription\n", "Owner", "Data size");
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while (note < TT.elf+offset+size) {
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char *p = note, *desc;
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unsigned namesz=elf_int(&p), descsz=elf_int(&p), type=elf_int(&p), j=0;
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if (namesz > size || descsz > size) {
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error_msg("%s: bad note @%lu", TT.f, offset);
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return;
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}
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printf(" %-20.*s 0x%08x\t", namesz, p, descsz);
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if (notematch(namesz, &p, "GNU", 4)) {
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if (type == 1) {
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printf("NT_GNU_ABI_TAG\tOS: %s, ABI: %u.%u.%u",
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!elf_int(&p)?"Linux":"?", elf_int(&p), elf_int(&p), elf_int(&p)), j=1;
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} else if (type == 3) {
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printf("NT_GNU_BUILD_ID\t");
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for (;j<descsz;j++) printf("%02x", *p++);
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} else if (type == 4) {
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printf("NT_GNU_GOLD_VERSION\t%.*s", descsz, p), j=1;
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} else p -= 4;
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} else if (notematch(namesz, &p, "Android", 8)) {
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if (type == 1) {
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printf("NT_VERSION\tAPI level %u", elf_int(&p)), j=1;
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if (descsz>=132) printf(", NDK %.64s (%.64s)", p, p+64);
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} else p -= 8;
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} else if (notematch(namesz, &p, "CORE", 5)) {
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if (*(desc = nt_type_core(type)) != '0') printf("%s", desc), j=1;
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} else if (notematch(namesz, &p, "LINUX", 6)) {
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if (*(desc = nt_type_linux(type)) != '0') printf("%s", desc), j=1;
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}
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// If we didn't do custom output above, show a hex dump.
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if (!j) {
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printf("0x%x\t", type);
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for (;j<descsz;j++) printf("%c%02x",!j?'\t':' ', *p++/*note[16+j]*/);
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}
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xputc('\n');
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note += 3*4 + ((namesz+3)&~3) + ((descsz+3)&~3);
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}
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}
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static void scan_elf()
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{
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struct sh dynamic = {}, dynstr = {}, dynsym = {}, shstr = {}, strtab = {},
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symtab = {}, s;
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struct ph ph;
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char *hdr = TT.elf;
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int type, machine, version, flags, entry, ehsize, phnum, shstrndx, i, j, w;
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if (TT.size < 45 || memcmp(hdr, "\177ELF", 4)) {
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error_msg("%s: not ELF", TT.f);
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return;
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}
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TT.bits = hdr[4] - 1;
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TT.endian = hdr[5];
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if (TT.bits<0 || TT.bits>1 || TT.endian<1 || TT.endian>2 || hdr[6]!=1) {
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error_msg("%s: bad ELF", TT.f);
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return;
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}
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hdr += 16; // EI_NIDENT
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type = elf_short(&hdr);
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machine = elf_short(&hdr);
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version = elf_int(&hdr);
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entry = elf_long(&hdr);
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TT.phoff = elf_long(&hdr);
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TT.shoff = elf_long(&hdr);
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flags = elf_int(&hdr);
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ehsize = elf_short(&hdr);
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TT.phentsize = elf_short(&hdr);
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phnum = elf_short(&hdr);
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TT.shentsize = elf_short(&hdr);
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TT.shnum = elf_short(&hdr);
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shstrndx = elf_short(&hdr);
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if (toys.optc > 1) printf("\nFile: %s\n", TT.f);
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if (FLAG(h)) {
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printf("ELF Header:\n");
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printf(" Magic: ");
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for (i=0; i<16; i++) printf("%02x%c", TT.elf[i], i==15?'\n':' ');
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printf(" Class: ELF%d\n", TT.bits?64:32);
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printf(" Data: 2's complement, %s endian\n",
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(TT.endian==2)?"big":"little");
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printf(" Version: 1 (current)\n");
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printf(" OS/ABI: %s\n", os_abi(TT.elf[7]));
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printf(" ABI Version: %d\n", TT.elf[8]);
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printf(" Type: %s\n", et_type(type));
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printf(" Machine: %s\n", elf_arch_name(machine));
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printf(" Version: 0x%x\n", version);
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printf(" Entry point address: 0x%x\n", entry);
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printf(" Start of program headers: %llu (bytes into file)\n",
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TT.phoff);
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printf(" Start of section headers: %llu (bytes into file)\n",
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TT.shoff);
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printf(" Flags: 0x%x\n", flags);
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printf(" Size of this header: %d (bytes)\n", ehsize);
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printf(" Size of program headers: %d (bytes)\n", TT.phentsize);
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printf(" Number of program headers: %d\n", phnum);
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printf(" Size of section headers: %d (bytes)\n", TT.shentsize);
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printf(" Number of section headers: %d\n", TT.shnum);
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printf(" Section header string table index: %d\n", shstrndx);
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}
|
|
if (TT.phoff > TT.size) {
|
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error_msg("%s: bad phoff", TT.f);
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return;
|
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}
|
|
if (TT.shoff > TT.size) {
|
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error_msg("%s: bad shoff", TT.f);
|
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return;
|
|
}
|
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|
|
// Set up the section header string table so we can use section header names.
|
|
// Core files have shstrndx == 0.
|
|
TT.shstrtab = 0;
|
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TT.shstrtabsz = 0;
|
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if (shstrndx != 0) {
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if (!get_sh(shstrndx, &shstr) || shstr.type != 3 /*SHT_STRTAB*/) {
|
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error_msg("%s: bad shstrndx", TT.f);
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return;
|
|
}
|
|
TT.shstrtab = TT.elf+shstr.offset;
|
|
TT.shstrtabsz = shstr.size;
|
|
}
|
|
|
|
w = 8<<TT.bits;
|
|
if (FLAG(S)) {
|
|
if (!TT.shnum) printf("\nThere are no sections in this file.\n");
|
|
else {
|
|
if (!FLAG(h)) {
|
|
printf("There are %d section headers, starting at offset %#llx:\n",
|
|
TT.shnum, TT.shoff);
|
|
}
|
|
printf("\n"
|
|
"Section Headers:\n"
|
|
" [Nr] %-17s %-15s %-*s %-6s %-6s ES Flg Lk Inf Al\n",
|
|
"Name", "Type", w, "Address", "Off", "Size");
|
|
}
|
|
}
|
|
// We need to iterate through the section headers even if we're not
|
|
// dumping them, to find specific sections.
|
|
for (i=0; i<TT.shnum; i++) {
|
|
if (!get_sh(i, &s)) continue;
|
|
if (s.type == 2 /*SHT_SYMTAB*/) symtab = s;
|
|
else if (s.type == 6 /*SHT_DYNAMIC*/) dynamic = s;
|
|
else if (s.type == 11 /*SHT_DYNSYM*/) dynsym = s;
|
|
else if (s.type == 3 /*SHT_STRTAB*/) {
|
|
if (!strcmp(s.name, ".strtab")) strtab = s;
|
|
else if (!strcmp(s.name, ".dynstr")) dynstr = s;
|
|
}
|
|
|
|
if (FLAG(S)) {
|
|
char sh_flags[12] = {}, *p = sh_flags;
|
|
|
|
for (j=0; j<12; j++) if (s.flags&(1<<j)) *p++="WAXxMSILOTC"[j];
|
|
printf(" [%2d] %-17s %-15s %0*llx %06llx %06llx %02llx %3s %2d %2d %2lld\n",
|
|
i, s.name, sh_type(s.type), w, s.addr, s.offset, s.size,
|
|
s.entsize, sh_flags, s.link, s.info, s.addralign);
|
|
}
|
|
}
|
|
if (FLAG(S) && TT.shnum) {
|
|
printf("Key:\n"
|
|
" (W)rite, (A)lloc, e(X)ecute, (M)erge, (S)trings, (I)nfo\n"
|
|
" (L)ink order, (O)S, (G)roup, (T)LS, (C)ompressed, x=unknown\n");
|
|
}
|
|
|
|
if (FLAG(l)) {
|
|
xputc('\n');
|
|
if (!phnum) printf("There are no program headers in this file.\n");
|
|
else {
|
|
if (!FLAG(h)) {
|
|
printf("Elf file type is %s\n"
|
|
"Entry point %#x\n"
|
|
"There are %d program headers, starting at offset %lld\n"
|
|
"\n",
|
|
et_type(type), entry, phnum, TT.phoff);
|
|
}
|
|
printf("Program Headers:\n"
|
|
" %-14s %-8s %-*s %-*s %-7s %-7s Flg Align\n", "Type",
|
|
"Offset", w, "VirtAddr", w, "PhysAddr", "FileSiz", "MemSiz");
|
|
for (i=0; i<phnum; i++) {
|
|
if (!get_ph(i, &ph)) continue;
|
|
printf(" %-14s 0x%06llx 0x%0*llx 0x%0*llx 0x%05llx 0x%05llx %c%c%c %#llx\n",
|
|
ph_type(ph.type), ph.offset, w, ph.vaddr, w, ph.paddr,
|
|
ph.filesz, ph.memsz, ph.flags&4?'R':' ', ph.flags&2?'W':' ',
|
|
ph.flags&1?'E':' ', ph.align);
|
|
if (ph.type == 3 /*PH_INTERP*/ && ph.filesz<TT.size &&
|
|
ph.offset<TT.size && ph.filesz - 1 < TT.size - ph.offset) {
|
|
printf(" [Requesting program interpreter: %*s]\n",
|
|
(int) ph.filesz-1, TT.elf+ph.offset);
|
|
}
|
|
}
|
|
|
|
printf("\n"
|
|
" Section to Segment mapping:\n"
|
|
" Segment Sections...\n");
|
|
for (i=0; i<phnum; i++) {
|
|
if (!get_ph(i, &ph)) continue;
|
|
printf(" %02d ", i);
|
|
for (j=0; j<TT.shnum; j++) {
|
|
if (!get_sh(j, &s)) continue;
|
|
if (!*s.name) continue;
|
|
if (s.offset >= ph.offset && s.offset+s.size <= ph.offset+ph.filesz)
|
|
printf("%s ", s.name);
|
|
}
|
|
xputc('\n');
|
|
}
|
|
}
|
|
}
|
|
|
|
// binutils ld emits a bunch of extra DT_NULL entries, so binutils readelf
|
|
// uses two passes here! We just tell the truth, which matches -h.
|
|
if (FLAG(d)) {
|
|
char *dyn = TT.elf+dynamic.offset, *end = dyn+dynamic.size;
|
|
|
|
xputc('\n');
|
|
if (!dynamic.size) printf("There is no dynamic section in this file.\n");
|
|
else if (!dynamic.entsize) printf("Bad dynamic entry size 0!\n");
|
|
else {
|
|
printf("Dynamic section at offset 0x%llx contains %lld entries:\n"
|
|
" %-*s %-20s %s\n",
|
|
dynamic.offset, dynamic.size/dynamic.entsize,
|
|
w+2, "Tag", "Type", "Name/Value");
|
|
while (dyn < end) {
|
|
unsigned long long tag = elf_long(&dyn), val = elf_long(&dyn);
|
|
char *type = dt_type(tag);
|
|
|
|
printf(" 0x%0*llx %-20s ", w, tag, *type=='0' ? type : type+1);
|
|
if (*type == 'd') printf("%lld\n", val);
|
|
else if (*type == 'b') printf("%lld (bytes)\n", val);
|
|
else if (*type == 's') printf("%s\n", TT.elf+dynstr.offset+val);
|
|
else if (*type == 'f' || *type == 'F') {
|
|
struct bitname { int bit; char *s; }
|
|
df_names[] = {{0, "ORIGIN"},{1,"SYMBOLIC"},{2,"TEXTREL"},
|
|
{3,"BIND_NOW"},{4,"STATIC_TLS"},{}},
|
|
df_1_names[]={{0,"NOW"},{1,"GLOBAL"},{2,"GROUP"},{3,"NODELETE"},
|
|
{5,"INITFIRST"},{27,"PIE"},{}},
|
|
*names = *type == 'f' ? df_names : df_1_names;
|
|
int mask;
|
|
|
|
if (*type == 'F') printf("Flags: ");
|
|
for (j=0; names[j].s; j++) {
|
|
if (val & (mask=(1<<names[j].bit))) {
|
|
printf("%s%s", names[j].s, (val &= ~mask) ? " " : "");
|
|
}
|
|
}
|
|
if (val) printf("0x%llx", val);
|
|
xputc('\n');
|
|
} else if (*type == 'N' || *type == 'R' || *type == 'S') {
|
|
char *s = TT.elf+dynstr.offset+val;
|
|
|
|
if (dynstr.offset>TT.size || val>TT.size || dynstr.offset>TT.size-val)
|
|
s = "???";
|
|
printf("%s: [%s]\n", *type=='N' ? "Shared library" :
|
|
(*type=='R' ? "Library runpath" : "Library soname"), s);
|
|
} else if (*type == 'P') {
|
|
type = dt_type(val);
|
|
j = strlen(type);
|
|
if (*type != '0') type += 2, j -= 3;
|
|
printf("%*.*s\n", j, j, type);
|
|
} else printf("0x%llx\n", val);
|
|
}
|
|
}
|
|
}
|
|
|
|
if (FLAG(dyn_syms)) show_symbols(&dynsym, &dynstr);
|
|
if (FLAG(s)) show_symbols(&symtab, &strtab);
|
|
|
|
if (FLAG(n)) {
|
|
int found = 0;
|
|
|
|
for (i=0; i<TT.shnum; i++) {
|
|
if (!get_sh(i, &s)) continue;
|
|
if (s.type == 7 /*SHT_NOTE*/) {
|
|
printf("\nDisplaying notes found in: %s\n", s.name);
|
|
show_notes(s.offset, s.size);
|
|
found = 1;
|
|
}
|
|
}
|
|
for (i=0; !found && i<phnum; i++) {
|
|
if (!get_ph(i, &ph)) continue;
|
|
if (ph.type == 4 /*PT_NOTE*/) {
|
|
printf("\n"
|
|
"Displaying notes found at file offset 0x%llx with length 0x%llx:\n",
|
|
ph.offset, ph.filesz);
|
|
show_notes(ph.offset, ph.filesz);
|
|
}
|
|
}
|
|
}
|
|
|
|
if (FLAG(x)) {
|
|
if (find_section(TT.x, &s)) {
|
|
char *p = TT.elf+s.offset;
|
|
long offset = 0;
|
|
|
|
printf("\nHex dump of section '%s':\n", s.name);
|
|
while (offset < s.size) {
|
|
int space = 2*16 + 16/4;
|
|
|
|
printf(" 0x%08lx ", offset);
|
|
for (i=0; i<16 && offset < s.size; offset++) {
|
|
space -= printf("%02x%s", *p++, ++i%4 ? "" : " ");
|
|
}
|
|
printf("%*s", space, "");
|
|
for (p-=i; i; i--, p++) putchar(*p>=' ' && *p<='~' ? *p : '.');
|
|
xputc('\n');
|
|
}
|
|
printf("\n");
|
|
}
|
|
}
|
|
|
|
if (FLAG(p)) {
|
|
if (find_section(TT.p, &s)) {
|
|
char *begin = TT.elf+s.offset, *end = begin + s.size, *p = begin;
|
|
int any = 0;
|
|
|
|
printf("\nString dump of section '%s':\n", s.name);
|
|
for (; p < end; p++) {
|
|
if (isprint(*p)) {
|
|
printf(" [%6tx] ", p-begin);
|
|
while (p < end && isprint(*p)) putchar(*p++);
|
|
xputc('\n');
|
|
any=1;
|
|
}
|
|
}
|
|
if (!any) printf(" No strings found in this section.\n");
|
|
printf("\n");
|
|
}
|
|
}
|
|
}
|
|
|
|
void readelf_main(void)
|
|
{
|
|
char **arg;
|
|
int all = FLAG_d|FLAG_h|FLAG_l|FLAG_n|FLAG_S|FLAG_s|FLAG_dyn_syms;
|
|
|
|
if (FLAG(a)) toys.optflags |= all;
|
|
if (FLAG(e)) toys.optflags |= FLAG_h|FLAG_l|FLAG_S;
|
|
if (FLAG(s)) toys.optflags |= FLAG_dyn_syms;
|
|
if (!(toys.optflags & (all|FLAG_p|FLAG_x))) help_exit("needs a flag");
|
|
|
|
for (arg = toys.optargs; *arg; arg++) {
|
|
int fd = open(TT.f = *arg, O_RDONLY);
|
|
struct stat sb;
|
|
|
|
if (fd == -1) perror_msg("%s", TT.f);
|
|
else {
|
|
if (fstat(fd, &sb)) perror_msg("%s", TT.f);
|
|
else if (!sb.st_size) error_msg("%s: empty", TT.f);
|
|
else if (!S_ISREG(sb.st_mode)) error_msg("%s: not a regular file",TT.f);
|
|
else {
|
|
TT.elf = xmmap(NULL, TT.size=sb.st_size, PROT_READ, MAP_SHARED, fd, 0);
|
|
scan_elf();
|
|
munmap(TT.elf, TT.size);
|
|
}
|
|
close(fd);
|
|
}
|
|
}
|
|
}
|