aboutsummaryrefslogtreecommitdiff
path: root/toys/pending/readelf.c
diff options
context:
space:
mode:
authorRob Landley <rob@landley.net>2021-05-15 13:57:12 -0500
committerRob Landley <rob@landley.net>2021-05-15 13:57:12 -0500
commita4430f2fbe5339c256b595c79be00e043ea0458a (patch)
tree914d44aec0b13ccf6f5711d9cc3848c9b719c106 /toys/pending/readelf.c
parent36dd3b2d27ac7a89754dbdbed6b81f3662e4dafb (diff)
downloadtoybox-a4430f2fbe5339c256b595c79be00e043ea0458a.tar.gz
Promote readelf to other.
Diffstat (limited to 'toys/pending/readelf.c')
-rw-r--r--toys/pending/readelf.c640
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);
- }
- }
-}