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31#define FOR_readelf
32#include "toys.h"
33
34GLOBALS(
35 char *x, *p;
36
37 char *elf, *shstrtab, *f;
38 unsigned long long shoff, phoff, size, shstrtabsz;
39 int bits, endian, shnum, shentsize, phentsize;
40)
41
42
43struct sh {
44 unsigned type, link, info;
45 unsigned long long flags, addr, offset, size, addralign, entsize;
46 char *name;
47};
48
49
50struct ph {
51 unsigned type, flags;
52 unsigned long long offset, vaddr, paddr, filesz, memsz, align;
53};
54
55static long long elf_get(char **p, int len)
56{
57 long long result;
58
59 if (*p+len-TT.elf>TT.size)
60 perror_exit("Access off end: %td[%d] of %lld\n", *p-TT.elf, len, TT.size);
61
62 result = ((TT.endian == 2) ? peek_be : peek_le)(*p, len);
63 *p += len;
64 return result;
65}
66
67static unsigned long long elf_long(char **p)
68{
69 return elf_get(p, 4*(TT.bits+1));
70}
71
72static unsigned elf_int(char **p)
73{
74 return elf_get(p, 4);
75}
76
77static unsigned short elf_short(char **p)
78{
79 return elf_get(p, 2);
80}
81
82static int get_sh(unsigned i, struct sh *s)
83{
84 char *shdr = TT.elf+TT.shoff+i*TT.shentsize;
85 unsigned name_offset;
86
87 if (i >= TT.shnum || shdr > TT.elf+TT.size-TT.shentsize) {
88 printf("No shdr %d\n", i);
89 return 0;
90 }
91
92 name_offset = elf_int(&shdr);
93 s->type = elf_int(&shdr);
94 s->flags = elf_long(&shdr);
95 s->addr = elf_long(&shdr);
96 s->offset = elf_long(&shdr);
97 s->size = elf_long(&shdr);
98 s->link = elf_int(&shdr);
99 s->info = elf_int(&shdr);
100 s->addralign = elf_long(&shdr);
101 s->entsize = elf_long(&shdr);
102
103 if (s->type != 8) {
104 if (s->offset>TT.size || s->size>TT.size || s->offset>TT.size-s->size) {
105 printf("Bad offset/size %llu/%llu for sh %d\n", s->offset, s->size, i);
106 return 0;
107 }
108 }
109
110 if (!TT.shstrtab) s->name = "?";
111 else {
112 s->name = TT.shstrtab + name_offset;
113 if (name_offset > TT.shstrtabsz || s->name >= TT.elf+TT.size) {
114 printf("Bad name for sh %d\n", i);
115 return 0;
116 }
117 }
118
119 return 1;
120}
121
122static int find_section(char *spec, struct sh *s)
123{
124 char *end;
125 unsigned i;
126
127
128 i = estrtol(spec, &end, 0);
129 if (!errno && !*end && i<TT.shnum) return get_sh(i, s);
130
131
132 for (i=0; i<TT.shnum; i++)
133 if (get_sh(i, s) && !strcmp(s->name, spec)) return 1;
134
135 error_msg("%s: no section '%s", TT.f, spec);
136 return 0;
137}
138
139static int get_ph(int i, struct ph *ph)
140{
141 char *phdr = TT.elf+TT.phoff+i*TT.phentsize;
142
143 if (phdr > TT.elf+TT.size-TT.phentsize) {
144 printf("Bad phdr %d\n", i);
145 return 0;
146 }
147
148
149 ph->type = elf_int(&phdr);
150 if (TT.bits) {
151 ph->flags = elf_int(&phdr);
152 ph->offset = elf_long(&phdr);
153 ph->vaddr = elf_long(&phdr);
154 ph->paddr = elf_long(&phdr);
155 ph->filesz = elf_long(&phdr);
156 ph->memsz = elf_long(&phdr);
157 ph->align = elf_long(&phdr);
158 } else {
159 ph->offset = elf_int(&phdr);
160 ph->vaddr = elf_int(&phdr);
161 ph->paddr = elf_int(&phdr);
162 ph->filesz = elf_int(&phdr);
163 ph->memsz = elf_int(&phdr);
164 ph->flags = elf_int(&phdr);
165 ph->align = elf_int(&phdr);
166 }
167
168 if (ph->offset >= TT.size-ph->filesz) {
169 printf("phdr %d has bad offset/size %llu/%llu", i, ph->offset, ph->filesz);
170 return 0;
171 }
172
173 return 1;
174}
175
176#define MAP(...) __VA_ARGS__
177#define DECODER(name, values) \
178 static char *name(int type) { \
179 static char unknown[20]; \
180 struct {int v; char *s;} a[] = values; \
181 int i; \
182 \
183 for (i=0; i<ARRAY_LEN(a); i++) if (type==a[i].v) return a[i].s; \
184 sprintf(unknown, "0x%x", type); \
185 return unknown; \
186 }
187
188DECODER(dt_type, MAP({{0,"x(NULL)"},{1,"N(NEEDED)"},{2,"b(PLTRELSZ)"},
189 {3,"x(PLTGOT)"},{4,"x(HASH)"},{5,"x(STRTAB)"},{6,"x(SYMTAB)"},{7,"x(RELA)"},
190 {8,"b(RELASZ)"},{9,"b(RELAENT)"},{10,"b(STRSZ)"},{11,"b(SYMENT)"},
191 {12,"x(INIT)"},{13,"x(FINI)"},{14,"S(SONAME)"},{15,"R(RPATH)"},
192 {16,"x(SYMBOLIC)"},{17,"x(REL)"},{18,"b(RELSZ)"},{19,"b(RELENT)"},
193 {20,"P(PLTREL)"},{21,"x(DEBUG)"},{22,"x(TEXTREL)"},{23,"x(JMPREL)"},
194 {24,"d(BIND_NOW)"},{25,"x(INIT_ARRAY)"},{26,"x(FINI_ARRAY)"},
195 {27,"b(INIT_ARRAYSZ)"},{28,"b(FINI_ARRAYSZ)"},{29,"R(RUNPATH)"},
196 {30,"f(FLAGS)"},{32,"x(PREINIT_ARRAY)"},{33,"x(PREINIT_ARRAYSZ)"},
197 {35,"b(RELRSZ)"},{36,"x(RELR)"},{37,"b(RELRENT)"},
198 {0x6000000f,"x(ANDROID_REL)"},{0x60000010,"b(ANDROID_RELSZ)"},
199 {0x60000011,"x(ANDROID_RELA)"},{0x60000012,"b(ANDROID_RELASZ)"},
200 {0x6fffe000,"x(ANDROID_RELR)"},{0x6fffe001,"b(ANDROID_RELRSZ)"},
201 {0x6fffe003,"x(ANDROID_RELRENT)"},{0x6ffffef5,"x(GNU_HASH)"},
202 {0x6ffffef6,"x(TLSDESC_PLT)"},{0x6ffffef7,"x(TLSDESC_GOT)"},
203 {0x6ffffff0,"x(VERSYM)"},{0x6ffffff9,"d(RELACOUNT)"},
204 {0x6ffffffa,"d(RELCOUNT)"},{0x6ffffffb,"F(FLAGS_1)"},
205 {0x6ffffffc," (VERDEF)"},{0x6ffffffd,"d(VERDEFNUM)"},
206 {0x6ffffffe,"x(VERNEED)"},{0x6fffffff,"d(VERNEEDNUM)"}}))
207
208DECODER(et_type, MAP({{0,"NONE (None)"},{1,"REL (Relocatable file)"},
209 {2,"EXEC (Executable file)"},{3,"DYN (Shared object file)"},
210 {4,"CORE (Core file)"}}))
211
212DECODER(nt_type_core, MAP({{1,"NT_PRSTATUS"},{2,"NT_FPREGSET"},
213 {3,"NT_PRPSINFO"},{5,"NT_PLATFORM"},{6,"NT_AUXV"},
214 {0x46494c45,"NT_FILE"},{0x53494749,"NT_SIGINFO"}}))
215
216DECODER(nt_type_linux, MAP({{0x200,"NT_386_TLS"},{0x202, "NT_X86_XSTATE"},
217 {0x400,"NT_ARM_VFP"},{0x401,"NT_ARM_TLS"},{0x405,"NT_ARM_SVE"}}))
218
219DECODER(os_abi, MAP({{0,"UNIX - System V"}}))
220
221DECODER(ph_type, MAP({{0,"NULL"},{1,"LOAD"},{2,"DYNAMIC"},{3,"INTERP"},
222 {4,"NOTE"},{5,"SHLIB"},{6,"PHDR"},{7,"TLS"},{0x6474e550,"GNU_EH_FRAME"},
223 {0x6474e551,"GNU_STACK"},{0x6474e552,"GNU_RELRO"},{0x70000001,"EXIDX"}}))
224
225DECODER(sh_type, MAP({{0,"NULL"},{1,"PROGBITS"},{2,"SYMTAB"},{3,"STRTAB"},
226 {4,"RELA"},{5,"HASH"},{6,"DYNAMIC"},{7,"NOTE"},{8,"NOBITS"},{9,"REL"},
227 {10,"SHLIB"},{11,"DYNSYM"},{14,"INIT_ARRAY"},{15,"FINI_ARRAY"},
228 {16,"PREINIT_ARRAY"},{17,"GROUP"},{18,"SYMTAB_SHNDX"},{19,"RELR"},
229 {0x60000001,"ANDROID_REL"},{0x60000002,"ANDROID_RELA"},
230 {0x6fffff00,"ANDROID_RELR"},{0x6ffffff6,"GNU_HASH"},
231 {0x6ffffffd,"VERDEF"},{0x6ffffffe,"VERNEED"},
232 {0x6fffffff,"VERSYM"},{0x70000001,"ARM_EXIDX"},
233 {0x70000003,"ARM_ATTRIBUTES"}}))
234
235DECODER(stb_type, MAP({{0,"LOCAL"},{1,"GLOBAL"},{2,"WEAK"}}))
236
237DECODER(stt_type, MAP({{0,"NOTYPE"},{1,"OBJECT"},{2,"FUNC"},{3,"SECTION"},
238 {4,"FILE"},{5,"COMMON"},{6,"TLS"},{10,"GNU_IFUNC"}}))
239
240DECODER(stv_type, MAP({{0,"DEFAULT"},{1,"INTERNAL"},{2,"HIDDEN"},
241 {3,"PROTECTED"}}))
242
243static void show_symbols(struct sh *table, struct sh *strtab)
244{
245 char *symtab = TT.elf+table->offset, *ndx;
246 int numsym = table->size/(TT.bits ? 24 : 16), i;
247
248 if (!numsym) return;
249
250 xputc('\n');
251 printf("Symbol table '%s' contains %d entries:\n"
252 " Num: %*s Size Type Bind Vis Ndx Name\n",
253 table->name, numsym, 5+8*TT.bits, "Value");
254 for (i=0; i<numsym; i++) {
255 unsigned st_name = elf_int(&symtab), st_value, st_shndx, st_info, st_other;
256 unsigned long st_size;
257 char *name, buf[16];
258
259
260 if (TT.bits) {
261 st_info = *symtab++;
262 st_other = *symtab++;
263 st_shndx = elf_short(&symtab);
264 st_value = elf_long(&symtab);
265 st_size = elf_long(&symtab);
266 } else {
267 st_value = elf_int(&symtab);
268 st_size = elf_int(&symtab);
269 st_info = *symtab++;
270 st_other = *symtab++;
271 st_shndx = elf_short(&symtab);
272 }
273
274
275 name = TT.elf + strtab->offset + st_name;
276 if (name >= TT.elf+TT.size) name = "???";
277
278 if (!st_shndx) ndx = "UND";
279 else if (st_shndx==0xfff1) ndx = "ABS";
280 else sprintf(ndx = buf, "%d", st_shndx);
281
282
283
284 printf("%6d: %0*x %5lu %-7s %-6s %-9s%3s %s\n", i, 8*(TT.bits+1),
285 st_value, st_size, stt_type(st_info & 0xf), stb_type(st_info >> 4),
286 stv_type(st_other & 3), ndx, name);
287 }
288}
289
290static int notematch(int namesz, char **p, char *expected)
291{
292 if (namesz!=strlen(expected)+1 || strcmp(*p, expected)) return 0;
293 *p += namesz;
294
295 return 1;
296}
297
298static void show_notes(unsigned long offset, unsigned long size)
299{
300 char *note = TT.elf + offset;
301
302 if (size > TT.size || offset > TT.size-size) {
303 printf("Bad note bounds %lu/%lu\n", offset, size);
304
305 return;
306 }
307
308 printf(" %-20s%11s\tDescription\n", "Owner", "Data size");
309 while (note < TT.elf+offset+size) {
310 char *p = note, *desc;
311 unsigned namesz=elf_int(&p), descsz=elf_int(&p), type=elf_int(&p), j=0;
312
313 if (namesz > size || descsz > size)
314 return error_msg("%s: bad note @%lu", TT.f, offset);
315 printf(" %-20.*s 0x%08x\t", namesz, p, descsz);
316 if (notematch(namesz, &p, "GNU")) {
317 if (type == 1) {
318 printf("NT_GNU_ABI_TAG\tOS: %s, ABI: %u.%u.%u",
319 !elf_int(&p)?"Linux":"?", elf_int(&p), elf_int(&p), elf_int(&p)), j=1;
320 } else if (type == 3) {
321
322 printf("NT_GNU_BUILD_ID\t");
323 for (;j<descsz;j++) printf("%02x", *p++);
324 } else if (type == 4) {
325 printf("NT_GNU_GOLD_VERSION\t%.*s", descsz, p), j=1;
326 } else p -= 4;
327 } else if (notematch(namesz, &p, "Android")) {
328 if (type == 1) {
329 printf("NT_VERSION\tAPI level %u", elf_int(&p)), j=1;
330 if (descsz>=132) printf(", NDK %.64s (%.64s)", p, p+64);
331 } else p -= 8;
332 } else if (notematch(namesz, &p, "CORE")) {
333 if (*(desc = nt_type_core(type)) != '0') printf("%s", desc), j=1;
334
335 } else if (notematch(namesz, &p, "LINUX")) {
336 if (*(desc = nt_type_linux(type)) != '0') printf("%s", desc), j=1;
337
338 }
339
340
341 if (!j) {
342 printf("0x%x\t", type);
343 for (;j<descsz;j++) printf("%c%02x", j ? ' ' : '\t', *p++);
344 }
345 xputc('\n');
346 note += 3*4 + ((namesz+3)&~3) + ((descsz+3)&~3);
347 }
348}
349
350static void scan_elf()
351{
352 struct sh dynamic = {}, dynstr = {}, dynsym = {}, shstr = {}, strtab = {},
353 symtab = {}, s;
354 struct ph ph;
355 char *hdr = TT.elf;
356 int type, machine, version, flags, entry, ehsize, phnum, shstrndx, i, j, w;
357
358 if (TT.size < 45 || memcmp(hdr, "\177ELF", 4))
359 return error_msg("%s: not ELF", TT.f);
360
361 TT.bits = hdr[4] - 1;
362 TT.endian = hdr[5];
363 if (TT.bits<0 || TT.bits>1 || TT.endian<1 || TT.endian>2 || hdr[6]!=1)
364 return error_msg("%s: bad ELF", TT.f);
365
366 hdr += 16;
367 type = elf_short(&hdr);
368 machine = elf_short(&hdr);
369 version = elf_int(&hdr);
370 entry = elf_long(&hdr);
371 TT.phoff = elf_long(&hdr);
372 TT.shoff = elf_long(&hdr);
373 flags = elf_int(&hdr);
374 ehsize = elf_short(&hdr);
375 TT.phentsize = elf_short(&hdr);
376 phnum = elf_short(&hdr);
377 TT.shentsize = elf_short(&hdr);
378 TT.shnum = elf_short(&hdr);
379 shstrndx = elf_short(&hdr);
380
381 if (toys.optc > 1) printf("\nFile: %s\n", TT.f);
382
383 if (FLAG(h)) {
384 printf("ELF Header:\n");
385 printf(" Magic: ");
386 for (i=0; i<16; i++) printf("%02x%c", TT.elf[i], (i==15) ? '\n' : ' ');
387 printf(" Class: ELF%d\n", TT.bits?64:32);
388 printf(" Data: 2's complement, %s endian\n",
389 (TT.endian==2)?"big":"little");
390 printf(" Version: 1 (current)\n");
391 printf(" OS/ABI: %s\n", os_abi(TT.elf[7]));
392 printf(" ABI Version: %d\n", TT.elf[8]);
393 printf(" Type: %s\n", et_type(type));
394 printf(" Machine: %s\n", elf_arch_name(machine));
395 printf(" Version: 0x%x\n", version);
396 printf(" Entry point address: 0x%x\n", entry);
397 printf(" Start of program headers: %llu (bytes into file)\n",
398 TT.phoff);
399 printf(" Start of section headers: %llu (bytes into file)\n",
400 TT.shoff);
401 printf(" Flags: 0x%x\n", flags);
402 printf(" Size of this header: %d (bytes)\n", ehsize);
403 printf(" Size of program headers: %d (bytes)\n", TT.phentsize);
404 printf(" Number of program headers: %d\n", phnum);
405 printf(" Size of section headers: %d (bytes)\n", TT.shentsize);
406 printf(" Number of section headers: %d\n", TT.shnum);
407 printf(" Section header string table index: %d\n", shstrndx);
408 }
409 if (TT.phoff > TT.size) return error_msg("%s: bad phoff", TT.f);
410 if (TT.shoff > TT.size) return error_msg("%s: bad shoff", TT.f);
411
412
413
414 TT.shstrtab = 0;
415 TT.shstrtabsz = 0;
416 if (shstrndx) {
417 if (!get_sh(shstrndx, &shstr) || shstr.type != 3 )
418 return error_msg("%s: bad shstrndx", TT.f);
419 TT.shstrtab = TT.elf+shstr.offset;
420 TT.shstrtabsz = shstr.size;
421 }
422
423 w = 8<<TT.bits;
424 if (FLAG(S)) {
425 if (!TT.shnum) printf("\nThere are no sections in this file.\n");
426 else {
427 if (!FLAG(h))
428 printf("There are %d section headers, starting at offset %#llx:\n",
429 TT.shnum, TT.shoff);
430 printf("\nSection Headers:\n"
431 " [Nr] %-17s %-15s %-*s %-6s %-6s ES Flg Lk Inf Al\n",
432 "Name", "Type", w, "Address", "Off", "Size");
433 }
434 }
435
436
437 for (i=0; i<TT.shnum; i++) {
438 if (!get_sh(i, &s)) continue;
439 if (s.type == 2 ) symtab = s;
440 else if (s.type == 6 ) dynamic = s;
441 else if (s.type == 11 ) dynsym = s;
442 else if (s.type == 3 ) {
443 if (!strcmp(s.name, ".strtab")) strtab = s;
444 else if (!strcmp(s.name, ".dynstr")) dynstr = s;
445 }
446
447 if (FLAG(S)) {
448 char sh_flags[12] = {}, *p = sh_flags;
449
450 for (j=0; j<12; j++) if (s.flags&(1<<j)) *p++ = "WAXxMSILOTC"[j];
451 printf(" [%2d] %-17s %-15s %0*llx %06llx %06llx %02llx %3s %2d %2d %2lld\n",
452 i, s.name, sh_type(s.type), w, s.addr, s.offset, s.size,
453 s.entsize, sh_flags, s.link, s.info, s.addralign);
454 }
455 }
456 if (FLAG(S) && TT.shnum)
457 printf("Key:\n (W)rite, (A)lloc, e(X)ecute, (M)erge, (S)trings, (I)nfo\n"
458 " (L)ink order, (O)S, (G)roup, (T)LS, (C)ompressed, x=unknown\n");
459
460 if (FLAG(l)) {
461 xputc('\n');
462 if (!phnum) printf("There are no program headers in this file.\n");
463 else {
464 if (!FLAG(h))
465 printf("Elf file type is %s\nEntry point %#x\n"
466 "There are %d program headers, starting at offset %lld\n\n",
467 et_type(type), entry, phnum, TT.phoff);
468 printf("Program Headers:\n"
469 " %-14s %-8s %-*s %-*s %-7s %-7s Flg Align\n", "Type",
470 "Offset", w, "VirtAddr", w, "PhysAddr", "FileSiz", "MemSiz");
471 for (i = 0; i<phnum; i++) {
472 if (!get_ph(i, &ph)) continue;
473 printf(" %-14s 0x%06llx 0x%0*llx 0x%0*llx 0x%05llx 0x%05llx %c%c%c %#llx\n",
474 ph_type(ph.type), ph.offset, w, ph.vaddr, w, ph.paddr,
475 ph.filesz, ph.memsz, (ph.flags&4)?'R':' ', (ph.flags&2)?'W':' ',
476 (ph.flags&1)?'E':' ', ph.align);
477 if (ph.type == 3 && ph.filesz<TT.size &&
478 ph.offset<TT.size && ph.filesz - 1 < TT.size - ph.offset) {
479
480 printf(" [Requesting program interpreter: %*s]\n",
481 (int) ph.filesz-1, TT.elf+ph.offset);
482 }
483 }
484
485 printf("\n Section to Segment mapping:\n Segment Sections...\n");
486 for (i=0; i<phnum; i++) {
487 if (!get_ph(i, &ph)) continue;
488 printf(" %02d ", i);
489 for (j=0; j<TT.shnum; j++) {
490 if (!get_sh(j, &s)) continue;
491 if (!*s.name) continue;
492 if (s.offset >= ph.offset && s.offset+s.size <= ph.offset+ph.filesz)
493 printf("%s ", s.name);
494 }
495 xputc('\n');
496 }
497 }
498 }
499
500
501
502 if (FLAG(d)) {
503 char *dyn = TT.elf+dynamic.offset, *end = dyn+dynamic.size;
504
505 xputc('\n');
506 if (!dynamic.size) printf("There is no dynamic section in this file.\n");
507 else if (!dynamic.entsize) printf("Bad dynamic entry size 0!\n");
508 else {
509 printf("Dynamic section at offset 0x%llx contains %lld entries:\n"
510 " %-*s %-20s %s\n", dynamic.offset, dynamic.size/dynamic.entsize,
511 w+2, "Tag", "Type", "Name/Value");
512 while (dyn < end) {
513 unsigned long long tag = elf_long(&dyn), val = elf_long(&dyn);
514 char *type = dt_type(tag);
515
516 printf(" 0x%0*llx %-20s ", w, tag, type+(*type!='0'));
517 if (*type == 'd') printf("%lld\n", val);
518 else if (*type == 'b') printf("%lld (bytes)\n", val);
519
520 else if (*type == 's') printf("%s\n", TT.elf+dynstr.offset+val);
521 else if (*type == 'f' || *type == 'F') {
522 struct bitname { int bit; char *s; }
523 df_names[] = {{0, "ORIGIN"},{1,"SYMBOLIC"},{2,"TEXTREL"},
524 {3,"BIND_NOW"},{4,"STATIC_TLS"},{}},
525 df_1_names[]={{0,"NOW"},{1,"GLOBAL"},{2,"GROUP"},{3,"NODELETE"},
526 {5,"INITFIRST"},{27,"PIE"},{}},
527 *names = *type == 'f' ? df_names : df_1_names;
528 int mask;
529
530 if (*type == 'F') printf("Flags: ");
531 for (j=0; names[j].s; j++)
532 if (val & (mask=(1<<names[j].bit)))
533 printf("%s%s", names[j].s, (val &= ~mask) ? " " : "");
534 if (val) printf("0x%llx", val);
535 xputc('\n');
536 } else if (*type == 'N' || *type == 'R' || *type == 'S') {
537 char *s = TT.elf+dynstr.offset+val;
538
539 if (dynstr.offset>TT.size || val>TT.size || dynstr.offset>TT.size-val)
540 s = "???";
541 printf("%s: [%s]\n", *type=='N' ? "Shared library" :
542 (*type=='R' ? "Library runpath" : "Library soname"), s);
543 } else if (*type == 'P') {
544 j = strlen(type = dt_type(val));
545 if (*type != '0') type += 2, j -= 3;
546 printf("%*.*s\n", j, j, type);
547 } else printf("0x%llx\n", val);
548 }
549 }
550 }
551
552 if (FLAG(dyn_syms)) show_symbols(&dynsym, &dynstr);
553 if (FLAG(s)) show_symbols(&symtab, &strtab);
554
555 if (FLAG(n)) {
556 int found = 0;
557
558 for (i=0; i<TT.shnum; i++) {
559 if (!get_sh(i, &s)) continue;
560 if (s.type == 7 ) {
561 printf("\nDisplaying notes found in: %s\n", s.name);
562 show_notes(s.offset, s.size);
563 found = 1;
564 }
565 }
566 for (i=0; !found && i<phnum; i++) {
567 if (!get_ph(i, &ph)) continue;
568 if (ph.type == 4 ) {
569 printf("\n"
570 "Displaying notes found at file offset 0x%llx with length 0x%llx:\n",
571 ph.offset, ph.filesz);
572 show_notes(ph.offset, ph.filesz);
573 }
574 }
575 }
576
577 if (FLAG(x) && find_section(TT.x, &s)) {
578 char *p = TT.elf+s.offset;
579 long offset = 0;
580
581 printf("\nHex dump of section '%s':\n", s.name);
582 while (offset < s.size) {
583 int space = 2*16 + 16/4;
584
585 printf(" 0x%08lx ", offset);
586 for (i=0; i<16 && offset < s.size; offset++)
587 space -= printf("%02x%s", *p++, " "+!!(++i%4));
588 printf("%*s", space, "");
589 for (p -= i; i; i--, p++) putchar((*p>=' ' && *p<='~') ? *p : '.');
590 xputc('\n');
591 }
592 xputc('\n');
593 }
594
595 if (FLAG(p) && find_section(TT.p, &s)) {
596 char *begin = TT.elf+s.offset, *end = begin + s.size, *p = begin;
597 int any = 0;
598
599 printf("\nString dump of section '%s':\n", s.name);
600 for (; p < end; p++) {
601 if (isprint(*p)) {
602 printf(" [%6tx] ", p-begin);
603 while (p < end && isprint(*p)) putchar(*p++);
604 xputc('\n');
605 any=1;
606 }
607 }
608 if (!any) printf(" No strings found in this section.\n");
609 xputc('\n');
610 }
611}
612
613void readelf_main(void)
614{
615 char **arg;
616 int all = FLAG_d|FLAG_h|FLAG_l|FLAG_n|FLAG_S|FLAG_s|FLAG_dyn_syms;
617
618 if (FLAG(a)) toys.optflags |= all;
619 if (FLAG(e)) toys.optflags |= FLAG_h|FLAG_l|FLAG_S;
620 if (FLAG(s)) toys.optflags |= FLAG_dyn_syms;
621 if (!(toys.optflags & (all|FLAG_p|FLAG_x))) help_exit("needs a flag");
622
623 for (arg = toys.optargs; *arg; arg++) {
624 int fd = open(TT.f = *arg, O_RDONLY);
625 struct stat sb;
626
627 if (fd == -1) perror_msg("%s", TT.f);
628 else {
629 if (fstat(fd, &sb)) perror_msg("%s", TT.f);
630 else if (!sb.st_size) error_msg("%s: empty", TT.f);
631 else if (!S_ISREG(sb.st_mode)) error_msg("%s: not a regular file",TT.f);
632 else {
633 TT.elf = xmmap(0, TT.size=sb.st_size, PROT_READ, MAP_SHARED, fd, 0);
634 scan_elf();
635 munmap(TT.elf, TT.size);
636 }
637 close(fd);
638 }
639 }
640}
641
