diff options
Diffstat (limited to 'toys/pending')
| -rw-r--r-- | toys/pending/readelf.c | 640 |
1 files changed, 0 insertions, 640 deletions
diff --git a/toys/pending/readelf.c b/toys/pending/readelf.c deleted file mode 100644 index 75726ecb..00000000 --- a/toys/pending/readelf.c +++ /dev/null @@ -1,640 +0,0 @@ -/* readelf.c - display information about ELF files. - * - * Copyright 2019 The Android Open Source Project - * - * See http://pubs.opengroup.org/onlinepubs/9699919799/utilities/nm.html - -USE_READELF(NEWTOY(readelf, "<1(dyn-syms)adehlnp:SsWx:", TOYFLAG_USR|TOYFLAG_BIN)) - -config READELF - bool "readelf" - default n - help - usage: readelf [-adehlnSs] [-p SECTION] [-x SECTION] [file...] - - Displays information about ELF files. - - -a Equivalent to -dhlnSs - -d Show dynamic section - -e Headers (equivalent to -hlS) - -h Show ELF header - -l Show program headers - -n Show notes - -p S Dump strings found in named/numbered section - -S Show section headers - -s Show symbol tables (.dynsym and .symtab) - -x S Hex dump of named/numbered section - - --dyn-syms Show just .dynsym symbol table -*/ - -#define FOR_readelf -#include "toys.h" - -GLOBALS( - char *x, *p; - - char *elf, *shstrtab, *f; - unsigned long long shoff, phoff, size, shstrtabsz; - int bits, endian, shnum, shentsize, phentsize; -) - -// Section header. -struct sh { - unsigned type, link, info; - unsigned long long flags, addr, offset, size, addralign, entsize; - char *name; -}; - -// Program header. -struct ph { - unsigned type, flags; - unsigned long long offset, vaddr, paddr, filesz, memsz, align; -}; - -static long long elf_get(char **p, int len) -{ - long long result; - - if (*p+len-TT.elf>TT.size) - perror_exit("Access off end: %ld[%d] of %lld\n", *p-TT.elf, len, TT.size); - - result = ((TT.endian == 2) ? peek_be : peek_le)(*p, len); - *p += len; - return result; -} - -static unsigned long long elf_long(char **p) -{ - return elf_get(p, 4*(TT.bits+1)); -} - -static unsigned elf_int(char **p) -{ - return elf_get(p, 4); -} - -static unsigned short elf_short(char **p) -{ - return elf_get(p, 2); -} - -static int get_sh(unsigned i, struct sh *s) -{ - char *shdr = TT.elf+TT.shoff+i*TT.shentsize; - unsigned name_offset; - - if (i >= TT.shnum || shdr > TT.elf+TT.size-TT.shentsize) { - printf("No shdr %d\n", i); - return 0; - } - - name_offset = elf_int(&shdr); - s->type = elf_int(&shdr); - s->flags = elf_long(&shdr); - s->addr = elf_long(&shdr); - s->offset = elf_long(&shdr); - s->size = elf_long(&shdr); - s->link = elf_int(&shdr); - s->info = elf_int(&shdr); - s->addralign = elf_long(&shdr); - s->entsize = elf_long(&shdr); - - if (s->type != 8) { - if (s->offset>TT.size || s->size>TT.size || s->offset>TT.size-s->size) { - printf("Bad offset/size %llu/%llu for sh %d\n", s->offset, s->size, i); - return 0; - } - } - - if (!TT.shstrtab) s->name = "?"; - else { - s->name = TT.shstrtab + name_offset; - if (name_offset > TT.shstrtabsz || s->name >= TT.elf+TT.size) { - printf("Bad name for sh %d\n", i); - return 0; - } - } - - return 1; -} - -static int find_section(char *spec, struct sh *s) -{ - char *end; - unsigned i; - - // Valid section number? - i = estrtol(spec, &end, 0); - if (!errno && !*end && i<TT.shnum) return get_sh(i, s); - - // Search the section names. - for (i=0; i<TT.shnum; i++) - if (get_sh(i, s) && !strcmp(s->name, spec)) return 1; - - error_msg("%s: no section '%s", TT.f, spec); - return 0; -} - -static int get_ph(int i, struct ph *ph) -{ - char *phdr = TT.elf+TT.phoff+i*TT.phentsize; - - if (phdr > TT.elf+TT.size-TT.phentsize) { - printf("Bad phdr %d\n", i); - return 0; - } - - // Elf64_Phdr reordered fields. - ph->type = elf_int(&phdr); - if (TT.bits) { - ph->flags = elf_int(&phdr); - ph->offset = elf_long(&phdr); - ph->vaddr = elf_long(&phdr); - ph->paddr = elf_long(&phdr); - ph->filesz = elf_long(&phdr); - ph->memsz = elf_long(&phdr); - ph->align = elf_long(&phdr); - } else { - ph->offset = elf_int(&phdr); - ph->vaddr = elf_int(&phdr); - ph->paddr = elf_int(&phdr); - ph->filesz = elf_int(&phdr); - ph->memsz = elf_int(&phdr); - ph->flags = elf_int(&phdr); - ph->align = elf_int(&phdr); - } - - if (ph->offset >= TT.size-ph->filesz) { - printf("phdr %d has bad offset/size %llu/%llu", i, ph->offset, ph->filesz); - return 0; - } - - return 1; -} - -#define MAP(...) __VA_ARGS__ -#define DECODER(name, values) \ - static char *name(int type) { \ - static char unknown[20]; \ - struct {int v; char *s;} a[] = values; \ - int i; \ - \ - for (i=0; i<ARRAY_LEN(a); i++) if (type==a[i].v) return a[i].s; \ - sprintf(unknown, "0x%x", type); \ - return unknown; \ - } - -DECODER(dt_type, MAP({{0,"x(NULL)"},{1,"N(NEEDED)"},{2,"b(PLTRELSZ)"}, - {3,"x(PLTGOT)"},{4,"x(HASH)"},{5,"x(STRTAB)"},{6,"x(SYMTAB)"},{7,"x(RELA)"}, - {8,"b(RELASZ)"},{9,"b(RELAENT)"},{10,"b(STRSZ)"},{11,"b(SYMENT)"}, - {12,"x(INIT)"},{13,"x(FINI)"},{14,"S(SONAME)"},{15,"R(RPATH)"}, - {16,"x(SYMBOLIC)"},{17,"x(REL)"},{18,"b(RELSZ)"},{19,"b(RELENT)"}, - {20,"P(PLTREL)"},{21,"x(DEBUG)"},{22,"x(TEXTREL)"},{23,"x(JMPREL)"}, - {24,"d(BIND_NOW)"},{25,"x(INIT_ARRAY)"},{26,"x(FINI_ARRAY)"}, - {27,"b(INIT_ARRAYSZ)"},{28,"b(FINI_ARRAYSZ)"},{29,"R(RUNPATH)"}, - {30,"f(FLAGS)"},{32,"x(PREINIT_ARRAY)"},{33,"x(PREINIT_ARRAYSZ)"}, - {35,"b(RELRSZ)"},{36,"x(RELR)"},{37,"b(RELRENT)"}, - {0x6000000f,"x(ANDROID_REL)"},{0x60000010,"b(ANDROID_RELSZ)"}, - {0x60000011,"x(ANDROID_RELA)"},{0x60000012,"b(ANDROID_RELASZ)"}, - {0x6fffe000,"x(ANDROID_RELR)"},{0x6fffe001,"b(ANDROID_RELRSZ)"}, - {0x6fffe003,"x(ANDROID_RELRENT)"},{0x6ffffef5,"x(GNU_HASH)"}, - {0x6ffffef6,"x(TLSDESC_PLT)"},{0x6ffffef7,"x(TLSDESC_GOT)"}, - {0x6ffffff0,"x(VERSYM)"},{0x6ffffff9,"d(RELACOUNT)"}, - {0x6ffffffa,"d(RELCOUNT)"},{0x6ffffffb,"F(FLAGS_1)"}, - {0x6ffffffc," (VERDEF)"},{0x6ffffffd,"d(VERDEFNUM)"}, - {0x6ffffffe,"x(VERNEED)"},{0x6fffffff,"d(VERNEEDNUM)"}})) - -DECODER(et_type, MAP({{0,"NONE (None)"},{1,"REL (Relocatable file)"}, - {2,"EXEC (Executable file)"},{3,"DYN (Shared object file)"}, - {4,"CORE (Core file)"}})) - -DECODER(nt_type_core, MAP({{1,"NT_PRSTATUS"},{2,"NT_FPREGSET"}, - {3,"NT_PRPSINFO"},{5,"NT_PLATFORM"},{6,"NT_AUXV"}, - {0x46494c45,"NT_FILE"},{0x53494749,"NT_SIGINFO"}})) - -DECODER(nt_type_linux, MAP({{0x200,"NT_386_TLS"},{0x202, "NT_X86_XSTATE"}, - {0x400,"NT_ARM_VFP"},{0x401,"NT_ARM_TLS"},{0x405,"NT_ARM_SVE"}})) - -DECODER(os_abi, MAP({{0,"UNIX - System V"}})) - -DECODER(ph_type, MAP({{0,"NULL"},{1,"LOAD"},{2,"DYNAMIC"},{3,"INTERP"}, - {4,"NOTE"},{5,"SHLIB"},{6,"PHDR"},{7,"TLS"},{0x6474e550,"GNU_EH_FRAME"}, - {0x6474e551,"GNU_STACK"},{0x6474e552,"GNU_RELRO"},{0x70000001,"EXIDX"}})) - -DECODER(sh_type, MAP({{0,"NULL"},{1,"PROGBITS"},{2,"SYMTAB"},{3,"STRTAB"}, - {4,"RELA"},{5,"HASH"},{6,"DYNAMIC"},{7,"NOTE"},{8,"NOBITS"},{9,"REL"}, - {10,"SHLIB"},{11,"DYNSYM"},{14,"INIT_ARRAY"},{15,"FINI_ARRAY"}, - {16,"PREINIT_ARRAY"},{17,"GROUP"},{18,"SYMTAB_SHNDX"},{19,"RELR"}, - {0x60000001,"ANDROID_REL"},{0x60000002,"ANDROID_RELA"}, - {0x6fffff00,"ANDROID_RELR"},{0x6ffffff6,"GNU_HASH"}, - {0x6ffffffd,"VERDEF"},{0x6ffffffe,"VERNEED"}, - {0x6fffffff,"VERSYM"},{0x70000001,"ARM_EXIDX"}, - {0x70000003,"ARM_ATTRIBUTES"}})) - -DECODER(stb_type, MAP({{0,"LOCAL"},{1,"GLOBAL"},{2,"WEAK"}})) - -DECODER(stt_type, MAP({{0,"NOTYPE"},{1,"OBJECT"},{2,"FUNC"},{3,"SECTION"}, - {4,"FILE"},{5,"COMMON"},{6,"TLS"},{10,"GNU_IFUNC"}})) - -DECODER(stv_type, MAP({{0,"DEFAULT"},{1,"INTERNAL"},{2,"HIDDEN"}, - {3,"PROTECTED"}})) - -static void show_symbols(struct sh *table, struct sh *strtab) -{ - char *symtab = TT.elf+table->offset, *ndx; - int numsym = table->size/(TT.bits ? 24 : 16), i; - - if (!numsym) return; - - xputc('\n'); - printf("Symbol table '%s' contains %d entries:\n" - " Num: %*s Size Type Bind Vis Ndx Name\n", - table->name, numsym, 5+8*TT.bits, "Value"); - for (i=0; i<numsym; i++) { - unsigned st_name = elf_int(&symtab), st_value, st_shndx, st_info, st_other; - unsigned long st_size; - char *name, buf[16]; - - // The various fields were moved around for 64-bit. - if (TT.bits) { - st_info = *symtab++; - st_other = *symtab++; - st_shndx = elf_short(&symtab); - st_value = elf_long(&symtab); - st_size = elf_long(&symtab); - } else { - st_value = elf_int(&symtab); - st_size = elf_int(&symtab); - st_info = *symtab++; - st_other = *symtab++; - st_shndx = elf_short(&symtab); - } - - // TODO: why do we trust name to be null terminated? - name = TT.elf + strtab->offset + st_name; - if (name >= TT.elf+TT.size) name = "???"; - - if (!st_shndx) ndx = "UND"; - else if (st_shndx==0xfff1) ndx = "ABS"; - else sprintf(ndx = buf, "%d", st_shndx); - - // TODO: look up and show any symbol versions with @ or @@. - - printf("%6d: %0*x %5lu %-7s %-6s %-9s%3s %s\n", i, 8*(TT.bits+1), - st_value, st_size, stt_type(st_info & 0xf), stb_type(st_info >> 4), - stv_type(st_other & 3), ndx, name); - } -} - -static int notematch(int namesz, char **p, char *expected) -{ - if (namesz!=strlen(expected)+1 || strcmp(*p, expected)) return 0; - *p += namesz; - - return 1; -} - -static void show_notes(unsigned long offset, unsigned long size) -{ - char *note = TT.elf + offset; - - if (size > TT.size || offset > TT.size-size) { - printf("Bad note bounds %lu/%lu\n", offset, size); - - return; - } - - printf(" %-20s%11s\tDescription\n", "Owner", "Data size"); - while (note < TT.elf+offset+size) { - char *p = note, *desc; - unsigned namesz=elf_int(&p), descsz=elf_int(&p), type=elf_int(&p), j=0; - - if (namesz > size || descsz > size) - return error_msg("%s: bad note @%lu", TT.f, offset); - printf(" %-20.*s 0x%08x\t", namesz, p, descsz); - if (notematch(namesz, &p, "GNU")) { - if (type == 1) { - printf("NT_GNU_ABI_TAG\tOS: %s, ABI: %u.%u.%u", - !elf_int(&p)?"Linux":"?", elf_int(&p), elf_int(&p), elf_int(&p)), j=1; - } else if (type == 3) { -// TODO should this set j=1? - printf("NT_GNU_BUILD_ID\t"); - for (;j<descsz;j++) printf("%02x", *p++); - } else if (type == 4) { - printf("NT_GNU_GOLD_VERSION\t%.*s", descsz, p), j=1; - } else p -= 4; - } else if (notematch(namesz, &p, "Android")) { - if (type == 1) { - printf("NT_VERSION\tAPI level %u", elf_int(&p)), j=1; - if (descsz>=132) printf(", NDK %.64s (%.64s)", p, p+64); - } else p -= 8; - } else if (notematch(namesz, &p, "CORE")) { - if (*(desc = nt_type_core(type)) != '0') printf("%s", desc), j=1; -// TODO else p -= 5? - } else if (notematch(namesz, &p, "LINUX")) { - if (*(desc = nt_type_linux(type)) != '0') printf("%s", desc), j=1; -// TODO else p -= 6? - } - - // If we didn't do custom output above, show a hex dump. - if (!j) { - printf("0x%x\t", type); - for (;j<descsz;j++) printf("%c%02x", j ? ' ' : '\t', *p++/*note[16+j]*/); - } - xputc('\n'); - note += 3*4 + ((namesz+3)&~3) + ((descsz+3)&~3); - } -} - -static void scan_elf() -{ - struct sh dynamic = {}, dynstr = {}, dynsym = {}, shstr = {}, strtab = {}, - symtab = {}, s; - struct ph ph; - char *hdr = TT.elf; - int type, machine, version, flags, entry, ehsize, phnum, shstrndx, i, j, w; - - if (TT.size < 45 || memcmp(hdr, "\177ELF", 4)) - return error_msg("%s: not ELF", TT.f); - - TT.bits = hdr[4] - 1; - TT.endian = hdr[5]; - if (TT.bits<0 || TT.bits>1 || TT.endian<1 || TT.endian>2 || hdr[6]!=1) - return error_msg("%s: bad ELF", TT.f); - - hdr += 16; // EI_NIDENT - type = elf_short(&hdr); - machine = elf_short(&hdr); - version = elf_int(&hdr); - entry = elf_long(&hdr); - TT.phoff = elf_long(&hdr); - TT.shoff = elf_long(&hdr); - flags = elf_int(&hdr); - ehsize = elf_short(&hdr); - TT.phentsize = elf_short(&hdr); - phnum = elf_short(&hdr); - TT.shentsize = elf_short(&hdr); - TT.shnum = elf_short(&hdr); - shstrndx = elf_short(&hdr); - - if (toys.optc > 1) printf("\nFile: %s\n", TT.f); - - if (FLAG(h)) { - printf("ELF Header:\n"); - printf(" Magic: "); - for (i=0; i<16; i++) printf("%02x%c", TT.elf[i], (i==15) ? '\n' : ' '); - printf(" Class: ELF%d\n", TT.bits?64:32); - printf(" Data: 2's complement, %s endian\n", - (TT.endian==2)?"big":"little"); - printf(" Version: 1 (current)\n"); - printf(" OS/ABI: %s\n", os_abi(TT.elf[7])); - printf(" ABI Version: %d\n", TT.elf[8]); - printf(" Type: %s\n", et_type(type)); - printf(" Machine: %s\n", elf_arch_name(machine)); - printf(" Version: 0x%x\n", version); - printf(" Entry point address: 0x%x\n", entry); - printf(" Start of program headers: %llu (bytes into file)\n", - TT.phoff); - printf(" Start of section headers: %llu (bytes into file)\n", - TT.shoff); - printf(" Flags: 0x%x\n", flags); - printf(" Size of this header: %d (bytes)\n", ehsize); - printf(" Size of program headers: %d (bytes)\n", TT.phentsize); - printf(" Number of program headers: %d\n", phnum); - printf(" Size of section headers: %d (bytes)\n", TT.shentsize); - printf(" Number of section headers: %d\n", TT.shnum); - printf(" Section header string table index: %d\n", shstrndx); - } - if (TT.phoff > TT.size) return error_msg("%s: bad phoff", TT.f); - if (TT.shoff > TT.size) return error_msg("%s: bad shoff", TT.f); - - // Set up the section header string table so we can use section header names. - // Core files have shstrndx == 0. - TT.shstrtab = 0; - TT.shstrtabsz = 0; - if (shstrndx) { - if (!get_sh(shstrndx, &shstr) || shstr.type != 3 /*SHT_STRTAB*/) - return error_msg("%s: bad shstrndx", TT.f); - 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("\nSection 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\nEntry 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) { -// TODO: ph.filesz of 0 prints unlimited length string - 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+(*type!='0')); - if (*type == 'd') printf("%lld\n", val); - else if (*type == 'b') printf("%lld (bytes)\n", val); -// TODO: trusting this %s to be null terminated - 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') { - j = strlen(type = dt_type(val)); - 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) && 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'); - } - xputc('\n'); - } - - if (FLAG(p) && 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"); - xputc('\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(0, TT.size=sb.st_size, PROT_READ, MAP_SHARED, fd, 0); - scan_elf(); - munmap(TT.elf, TT.size); - } - close(fd); - } - } -} |