| 1 |
/* |
| 2 |
* Copyright (C) 2003-2007 Anders Gavare. All rights reserved. |
| 3 |
* |
| 4 |
* Redistribution and use in source and binary forms, with or without |
| 5 |
* modification, are permitted provided that the following conditions are met: |
| 6 |
* |
| 7 |
* 1. Redistributions of source code must retain the above copyright |
| 8 |
* notice, this list of conditions and the following disclaimer. |
| 9 |
* 2. Redistributions in binary form must reproduce the above copyright |
| 10 |
* notice, this list of conditions and the following disclaimer in the |
| 11 |
* documentation and/or other materials provided with the distribution. |
| 12 |
* 3. The name of the author may not be used to endorse or promote products |
| 13 |
* derived from this software without specific prior written permission. |
| 14 |
* |
| 15 |
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND |
| 16 |
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 17 |
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 18 |
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE |
| 19 |
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| 20 |
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| 21 |
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| 23 |
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| 24 |
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| 25 |
* SUCH DAMAGE. |
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* |
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* |
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* $Id: file_elf.c,v 1.2 2007/04/18 14:08:35 debug Exp $ |
| 29 |
* |
| 30 |
* ELF file support. |
| 31 |
*/ |
| 32 |
|
| 33 |
/* Note: Included from file.c. */ |
| 34 |
|
| 35 |
|
| 36 |
#include "exec_elf.h" |
| 37 |
|
| 38 |
/* ELF machine types as strings: (same as exec_elf.h) */ |
| 39 |
#define N_ELF_MACHINE_TYPES 84 |
| 40 |
static char *elf_machine_type[N_ELF_MACHINE_TYPES] = { |
| 41 |
"NONE", "M32", "SPARC", "386", /* 0..3 */ |
| 42 |
"68K", "88K", "486", "860", /* 4..7 */ |
| 43 |
"MIPS", "S370", "MIPS_RS3_LE", "RS6000", /* 8..11 */ |
| 44 |
"unknown12", "unknown13", "unknown14", "PARISC", /* 12..15 */ |
| 45 |
"NCUBE", "VPP500", "SPARC32PLUS", "960", /* 16..19 */ |
| 46 |
"PPC", "PPC64", "unknown22", "unknown23", /* 20..23 */ |
| 47 |
"unknown24", "unknown25", "unknown26", "unknown27", /* 24..27 */ |
| 48 |
"unknown28", "unknown29", "unknown30", "unknown31", /* 28..31 */ |
| 49 |
"unknown32", "unknown33", "unknown34", "unknown35", /* 32..35 */ |
| 50 |
"V800", "FR20", "RH32", "RCE", /* 36..39 */ |
| 51 |
"ARM", "ALPHA", "SH", "SPARCV9", /* 40..43 */ |
| 52 |
"TRICORE", "ARC", "H8_300", "H8_300H", /* 44..47 */ |
| 53 |
"H8S", "H8_500", "IA_64", "MIPS_X", /* 48..51 */ |
| 54 |
"COLDFIRE", "68HC12", "unknown54", "unknown55", /* 52..55 */ |
| 55 |
"unknown56", "unknown57", "unknown58", "unknown59", /* 56..59 */ |
| 56 |
"unknown60", "unknown61", "AMD64", "unknown63", /* 60..63 */ |
| 57 |
"unknown64", "unknown65", "unknown66", "unknown67", /* 64..67 */ |
| 58 |
"unknown68", "unknown69", "unknown70", "unknown71", /* 68..71 */ |
| 59 |
"unknown72", "unknown73", "unknown74", "unknown75", /* 72..75 */ |
| 60 |
"unknown76", "unknown77", "unknown78", "unknown79", /* 76..79 */ |
| 61 |
"unknown80", "unknown81", "unknown82", "AVR" /* 80..83 */ |
| 62 |
}; |
| 63 |
|
| 64 |
|
| 65 |
/* |
| 66 |
* file_load_elf(): |
| 67 |
* |
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* Loads an ELF image into the emulated memory. The entry point (read from |
| 69 |
* the ELF header) and the initial value of the gp register (read from the |
| 70 |
* ELF symbol table) are stored in the specified CPU's registers. |
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* |
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* This is pretty heavy stuff, but is needed because of the heaviness of |
| 73 |
* ELF files. :-/ Hopefully it will be able to recognize most valid ELFs. |
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*/ |
| 75 |
static void file_load_elf(struct machine *m, struct memory *mem, |
| 76 |
char *filename, uint64_t *entrypointp, int arch, uint64_t *gpp, |
| 77 |
int *byte_order, uint64_t *tocp) |
| 78 |
{ |
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Elf32_Ehdr hdr32; |
| 80 |
Elf64_Ehdr hdr64; |
| 81 |
FILE *f; |
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uint64_t eentry; |
| 83 |
int len, i, ok; |
| 84 |
int elf64, encoding, eflags; |
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int etype, emachine; |
| 86 |
int ephnum, ephentsize, eshnum, eshentsize; |
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off_t ephoff, eshoff; |
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Elf32_Phdr phdr32; |
| 89 |
Elf64_Phdr phdr64; |
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Elf32_Shdr shdr32; |
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Elf64_Shdr shdr64; |
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Elf32_Sym sym32; |
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Elf64_Sym sym64; |
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int ofs; |
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int chunk_len = 1024, align_len; |
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char *symbol_strings = NULL; size_t symbol_length = 0; |
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char *s; |
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Elf32_Sym *symbols_sym32 = NULL; int n_symbols = 0; |
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Elf64_Sym *symbols_sym64 = NULL; |
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|
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f = fopen(filename, "r"); |
| 102 |
if (f == NULL) { |
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perror(filename); |
| 104 |
exit(1); |
| 105 |
} |
| 106 |
|
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len = fread(&hdr32, 1, sizeof(Elf32_Ehdr), f); |
| 108 |
if (len < (signed int)sizeof(Elf32_Ehdr)) { |
| 109 |
fprintf(stderr, "%s: not an ELF file image\n", filename); |
| 110 |
exit(1); |
| 111 |
} |
| 112 |
|
| 113 |
if (memcmp(&hdr32.e_ident[EI_MAG0], ELFMAG, SELFMAG) != 0) { |
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fprintf(stderr, "%s: not an ELF file image\n", filename); |
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exit(1); |
| 116 |
} |
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|
| 118 |
switch (hdr32.e_ident[EI_CLASS]) { |
| 119 |
case ELFCLASS32: |
| 120 |
elf64 = 0; |
| 121 |
break; |
| 122 |
case ELFCLASS64: |
| 123 |
elf64 = 1; |
| 124 |
fseek(f, 0, SEEK_SET); |
| 125 |
len = fread(&hdr64, 1, sizeof(Elf64_Ehdr), f); |
| 126 |
if (len < (signed int)sizeof(Elf64_Ehdr)) { |
| 127 |
fprintf(stderr, "%s: not an ELF64 file image\n", |
| 128 |
filename); |
| 129 |
exit(1); |
| 130 |
} |
| 131 |
break; |
| 132 |
default: |
| 133 |
fprintf(stderr, "%s: unknown ELF class '%i'\n", |
| 134 |
filename, hdr32.e_ident[EI_CLASS]); |
| 135 |
exit(1); |
| 136 |
} |
| 137 |
|
| 138 |
encoding = hdr32.e_ident[EI_DATA]; |
| 139 |
if (encoding != ELFDATA2LSB && encoding != ELFDATA2MSB) { |
| 140 |
fprintf(stderr, "%s: unknown data encoding '%i'\n", |
| 141 |
filename, hdr32.e_ident[EI_DATA]); |
| 142 |
exit(1); |
| 143 |
} |
| 144 |
|
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if (elf64) { |
| 146 |
unencode(etype, &hdr64.e_type, Elf64_Quarter); |
| 147 |
unencode(eflags, &hdr64.e_flags, Elf64_Half); |
| 148 |
unencode(emachine, &hdr64.e_machine, Elf64_Quarter); |
| 149 |
unencode(eentry, &hdr64.e_entry, Elf64_Addr); |
| 150 |
unencode(ephnum, &hdr64.e_phnum, Elf64_Quarter); |
| 151 |
unencode(ephentsize, &hdr64.e_phentsize, Elf64_Quarter); |
| 152 |
unencode(ephoff, &hdr64.e_phoff, Elf64_Off); |
| 153 |
unencode(eshnum, &hdr64.e_shnum, Elf64_Quarter); |
| 154 |
unencode(eshentsize, &hdr64.e_shentsize, Elf64_Quarter); |
| 155 |
unencode(eshoff, &hdr64.e_shoff, Elf64_Off); |
| 156 |
if (ephentsize != sizeof(Elf64_Phdr)) { |
| 157 |
fprintf(stderr, "%s: incorrect phentsize? %i, should " |
| 158 |
"be %i\nPerhaps this is a dynamically linked " |
| 159 |
"binary (which isn't supported yet).\n", filename, |
| 160 |
(int)ephentsize, (int)sizeof(Elf64_Phdr)); |
| 161 |
exit(1); |
| 162 |
} |
| 163 |
if (eshentsize != sizeof(Elf64_Shdr)) { |
| 164 |
fprintf(stderr, "%s: incorrect shentsize? %i, should " |
| 165 |
"be %i\nPerhaps this is a dynamically linked " |
| 166 |
"binary (which isn't supported yet).\n", filename, |
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(int)eshentsize, (int)sizeof(Elf64_Shdr)); |
| 168 |
exit(1); |
| 169 |
} |
| 170 |
} else { |
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unencode(etype, &hdr32.e_type, Elf32_Half); |
| 172 |
unencode(eflags, &hdr32.e_flags, Elf32_Word); |
| 173 |
unencode(emachine, &hdr32.e_machine, Elf32_Half); |
| 174 |
unencode(eentry, &hdr32.e_entry, Elf32_Addr); |
| 175 |
unencode(ephnum, &hdr32.e_phnum, Elf32_Half); |
| 176 |
unencode(ephentsize, &hdr32.e_phentsize, Elf32_Half); |
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unencode(ephoff, &hdr32.e_phoff, Elf32_Off); |
| 178 |
unencode(eshnum, &hdr32.e_shnum, Elf32_Half); |
| 179 |
unencode(eshentsize, &hdr32.e_shentsize, Elf32_Half); |
| 180 |
unencode(eshoff, &hdr32.e_shoff, Elf32_Off); |
| 181 |
if (ephentsize != sizeof(Elf32_Phdr)) { |
| 182 |
fprintf(stderr, "%s: incorrect phentsize? %i, should " |
| 183 |
"be %i\nPerhaps this is a dynamically linked " |
| 184 |
"binary (which isn't supported yet).\n", filename, |
| 185 |
(int)ephentsize, (int)sizeof(Elf32_Phdr)); |
| 186 |
exit(1); |
| 187 |
} |
| 188 |
if (eshentsize != sizeof(Elf32_Shdr)) { |
| 189 |
fprintf(stderr, "%s: incorrect shentsize? %i, should " |
| 190 |
"be %i\nPerhaps this is a dynamically linked " |
| 191 |
"binary (which isn't supported yet).\n", filename, |
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(int)eshentsize, (int)sizeof(Elf32_Shdr)); |
| 193 |
exit(1); |
| 194 |
} |
| 195 |
} |
| 196 |
|
| 197 |
if ( etype != ET_EXEC ) { |
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fprintf(stderr, "%s is not an ELF Executable file, type = %i\n", |
| 199 |
filename, etype); |
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exit(1); |
| 201 |
} |
| 202 |
|
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ok = 0; |
| 204 |
switch (arch) { |
| 205 |
case ARCH_ALPHA: |
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switch (emachine) { |
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case EM_ALPHA: |
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case -28634: |
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ok = 1; |
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} |
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break; |
| 212 |
case ARCH_ARM: |
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switch (emachine) { |
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case EM_ARM: |
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ok = 1; |
| 216 |
} |
| 217 |
break; |
| 218 |
case ARCH_AVR: |
| 219 |
switch (emachine) { |
| 220 |
case EM_AVR: |
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ok = 1; |
| 222 |
} |
| 223 |
break; |
| 224 |
/* case ARCH_AVR32: |
| 225 |
switch (emachine) { |
| 226 |
case 6317: |
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ok = 1; |
| 228 |
} |
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break; |
| 230 |
case ARCH_HPPA: |
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switch (emachine) { |
| 232 |
case EM_PARISC: |
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ok = 1; |
| 234 |
} |
| 235 |
break; |
| 236 |
case ARCH_I960: |
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switch (emachine) { |
| 238 |
case EM_960: |
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ok = 1; |
| 240 |
} |
| 241 |
break; |
| 242 |
case ARCH_IA64: |
| 243 |
switch (emachine) { |
| 244 |
case EM_IA_64: |
| 245 |
ok = 1; |
| 246 |
} |
| 247 |
break; */ |
| 248 |
/* case ARCH_M68K: |
| 249 |
switch (emachine) { |
| 250 |
case EM_68K: |
| 251 |
ok = 1; |
| 252 |
} |
| 253 |
break; */ |
| 254 |
case ARCH_MIPS: |
| 255 |
switch (emachine) { |
| 256 |
case EM_MIPS: |
| 257 |
case EM_MIPS_RS3_LE: |
| 258 |
ok = 1; |
| 259 |
} |
| 260 |
break; |
| 261 |
case ARCH_PPC: |
| 262 |
switch (emachine) { |
| 263 |
case EM_PPC: |
| 264 |
case EM_PPC64: |
| 265 |
ok = 1; |
| 266 |
} |
| 267 |
break; |
| 268 |
case ARCH_SH: |
| 269 |
switch (emachine) { |
| 270 |
case EM_SH: |
| 271 |
ok = 1; |
| 272 |
} |
| 273 |
break; |
| 274 |
case ARCH_SPARC: |
| 275 |
switch (emachine) { |
| 276 |
case EM_SPARC: |
| 277 |
case EM_SPARCV9: |
| 278 |
ok = 1; |
| 279 |
} |
| 280 |
break; |
| 281 |
/* case ARCH_X86: |
| 282 |
switch (emachine) { |
| 283 |
case EM_386: |
| 284 |
case EM_486: |
| 285 |
*tocp = 1; |
| 286 |
ok = 1; |
| 287 |
break; |
| 288 |
case EM_AMD64: |
| 289 |
*tocp = 2; |
| 290 |
ok = 1; |
| 291 |
break; |
| 292 |
} |
| 293 |
break; */ |
| 294 |
default: |
| 295 |
fatal("file.c: INTERNAL ERROR: Unimplemented arch!\n"); |
| 296 |
} |
| 297 |
if (!ok) { |
| 298 |
fprintf(stderr, "%s: this is a ", filename); |
| 299 |
if (emachine >= 0 && emachine < N_ELF_MACHINE_TYPES) |
| 300 |
fprintf(stderr, elf_machine_type[emachine]); |
| 301 |
else |
| 302 |
fprintf(stderr, "machine type '%i'", emachine); |
| 303 |
fprintf(stderr, " ELF binary!\n"); |
| 304 |
exit(1); |
| 305 |
} |
| 306 |
|
| 307 |
s = "entry point"; |
| 308 |
if (elf64 && arch == ARCH_PPC) |
| 309 |
s = "function descriptor at"; |
| 310 |
|
| 311 |
debug("ELF%i %s, %s 0x", elf64? 64 : 32, |
| 312 |
encoding == ELFDATA2LSB? "LSB (LE)" : "MSB (BE)", s); |
| 313 |
|
| 314 |
if (elf64) |
| 315 |
debug("%016"PRIx64"\n", (uint64_t) eentry); |
| 316 |
else |
| 317 |
debug("%08"PRIx32"\n", (uint32_t) eentry); |
| 318 |
|
| 319 |
/* |
| 320 |
* SH64: 32-bit instruction encoding? |
| 321 |
*/ |
| 322 |
if (arch == ARCH_SH && (eentry & 1)) { |
| 323 |
debug("SH64: 32-bit instruction encoding\n"); |
| 324 |
m->cpus[0]->cd.sh.compact = 0; |
| 325 |
m->cpus[0]->cd.sh.cpu_type.bits = 64; |
| 326 |
} |
| 327 |
|
| 328 |
/* Read the program headers: */ |
| 329 |
|
| 330 |
for (i=0; i<ephnum; i++) { |
| 331 |
int p_type; |
| 332 |
uint64_t p_offset; |
| 333 |
uint64_t p_vaddr; |
| 334 |
uint64_t p_paddr; |
| 335 |
uint64_t p_filesz; |
| 336 |
uint64_t p_memsz; |
| 337 |
int p_flags; |
| 338 |
int p_align; |
| 339 |
|
| 340 |
fseek(f, ephoff + i * ephentsize, SEEK_SET); |
| 341 |
|
| 342 |
if (elf64) { |
| 343 |
fread(&phdr64, 1, sizeof(Elf64_Phdr), f); |
| 344 |
unencode(p_type, &phdr64.p_type, Elf64_Half); |
| 345 |
unencode(p_flags, &phdr64.p_flags, Elf64_Half); |
| 346 |
unencode(p_offset, &phdr64.p_offset, Elf64_Off); |
| 347 |
unencode(p_vaddr, &phdr64.p_vaddr, Elf64_Addr); |
| 348 |
unencode(p_paddr, &phdr64.p_paddr, Elf64_Addr); |
| 349 |
unencode(p_filesz, &phdr64.p_filesz, Elf64_Xword); |
| 350 |
unencode(p_memsz, &phdr64.p_memsz, Elf64_Xword); |
| 351 |
unencode(p_align, &phdr64.p_align, Elf64_Xword); |
| 352 |
} else { |
| 353 |
fread(&phdr32, 1, sizeof(Elf32_Phdr), f); |
| 354 |
unencode(p_type, &phdr32.p_type, Elf32_Word); |
| 355 |
unencode(p_offset, &phdr32.p_offset, Elf32_Off); |
| 356 |
unencode(p_vaddr, &phdr32.p_vaddr, Elf32_Addr); |
| 357 |
unencode(p_paddr, &phdr32.p_paddr, Elf32_Addr); |
| 358 |
unencode(p_filesz, &phdr32.p_filesz, Elf32_Word); |
| 359 |
unencode(p_memsz, &phdr32.p_memsz, Elf32_Word); |
| 360 |
unencode(p_flags, &phdr32.p_flags, Elf32_Word); |
| 361 |
unencode(p_align, &phdr32.p_align, Elf32_Word); |
| 362 |
} |
| 363 |
|
| 364 |
/* |
| 365 |
* Hack for loading PPC kernels that are linked to high |
| 366 |
* addresses. (This requires enabling of instruction and |
| 367 |
* data virtual address translation.) |
| 368 |
*/ |
| 369 |
if (arch == ARCH_PPC) { |
| 370 |
if ( (elf64 && (p_vaddr >> 60) != 0) || |
| 371 |
(!elf64 && (p_vaddr >> 28) != 0) ) |
| 372 |
m->cpus[m->bootstrap_cpu]-> |
| 373 |
cd.ppc.msr |= PPC_MSR_IR | PPC_MSR_DR; |
| 374 |
} |
| 375 |
|
| 376 |
if (p_memsz != 0 && (p_type == PT_LOAD || |
| 377 |
(p_type & PF_MASKPROC) == PT_MIPS_REGINFO)) { |
| 378 |
debug("chunk %i (", i); |
| 379 |
if (p_type == PT_LOAD) |
| 380 |
debug("load"); |
| 381 |
else |
| 382 |
debug("0x%08"PRIx32, (uint32_t) p_type); |
| 383 |
|
| 384 |
debug(") @ 0x%"PRIx64", vaddr 0x", (uint64_t) p_offset); |
| 385 |
|
| 386 |
if (elf64) |
| 387 |
debug("%016"PRIx64, (uint64_t) p_vaddr); |
| 388 |
else |
| 389 |
debug("%08"PRIx32, (uint32_t) p_vaddr); |
| 390 |
|
| 391 |
debug(" len=0x%"PRIx64"\n", (uint64_t) p_memsz); |
| 392 |
|
| 393 |
if (p_vaddr != p_paddr) { |
| 394 |
if (elf64) |
| 395 |
debug("NOTE: vaddr (0x%"PRIx64") and " |
| 396 |
"paddr (0x%"PRIx64") differ; using " |
| 397 |
"vaddr\n", (uint64_t) p_vaddr, |
| 398 |
(uint64_t) p_paddr); |
| 399 |
else |
| 400 |
debug("NOTE: vaddr (0x%08"PRIx32") and " |
| 401 |
"paddr (0x%08"PRIx32") differ; usin" |
| 402 |
"g vaddr\n", (uint32_t) p_vaddr, |
| 403 |
(uint32_t)p_paddr); |
| 404 |
} |
| 405 |
|
| 406 |
if (p_memsz < p_filesz) { |
| 407 |
fprintf(stderr, "%s: memsz < filesz. TODO: how" |
| 408 |
" to handle this? memsz=%016"PRIx64 |
| 409 |
" filesz=%016"PRIx64"\n", filename, |
| 410 |
(uint64_t) p_memsz, (uint64_t) p_filesz); |
| 411 |
exit(1); |
| 412 |
} |
| 413 |
|
| 414 |
fseek(f, p_offset, SEEK_SET); |
| 415 |
align_len = 1; |
| 416 |
if ((p_vaddr & 0xf)==0) align_len = 0x10; |
| 417 |
if ((p_vaddr & 0x3f)==0) align_len = 0x40; |
| 418 |
if ((p_vaddr & 0xff)==0) align_len = 0x100; |
| 419 |
if ((p_vaddr & 0xfff)==0) align_len = 0x1000; |
| 420 |
if ((p_vaddr & 0x3fff)==0) align_len = 0x4000; |
| 421 |
if ((p_vaddr & 0xffff)==0) align_len = 0x10000; |
| 422 |
ofs = 0; len = chunk_len = align_len; |
| 423 |
while (ofs < (int64_t)p_filesz && len==chunk_len) { |
| 424 |
unsigned char *ch = malloc(chunk_len); |
| 425 |
int i = 0; |
| 426 |
|
| 427 |
/* Switch to larger size, if possible: */ |
| 428 |
if (align_len < 0x10000 && |
| 429 |
((p_vaddr + ofs) & 0xffff)==0) { |
| 430 |
align_len = 0x10000; |
| 431 |
len = chunk_len = align_len; |
| 432 |
free(ch); |
| 433 |
ch = malloc(chunk_len); |
| 434 |
} else if (align_len < 0x1000 && |
| 435 |
((p_vaddr + ofs) & 0xfff)==0) { |
| 436 |
align_len = 0x1000; |
| 437 |
len = chunk_len = align_len; |
| 438 |
free(ch); |
| 439 |
ch = malloc(chunk_len); |
| 440 |
} |
| 441 |
|
| 442 |
if (ch == NULL) { |
| 443 |
fprintf(stderr, "out of memory\n"); |
| 444 |
exit(1); |
| 445 |
} |
| 446 |
|
| 447 |
len = fread(&ch[0], 1, chunk_len, f); |
| 448 |
if (ofs + len > (int64_t)p_filesz) |
| 449 |
len = p_filesz - ofs; |
| 450 |
|
| 451 |
while (i < len) { |
| 452 |
size_t len_to_copy; |
| 453 |
len_to_copy = (i + align_len) <= len? |
| 454 |
align_len : len - i; |
| 455 |
m->cpus[0]->memory_rw(m->cpus[0], mem, |
| 456 |
p_vaddr + ofs, &ch[i], len_to_copy, |
| 457 |
MEM_WRITE, NO_EXCEPTIONS); |
| 458 |
ofs += align_len; |
| 459 |
i += align_len; |
| 460 |
} |
| 461 |
|
| 462 |
free(ch); |
| 463 |
} |
| 464 |
} |
| 465 |
} |
| 466 |
|
| 467 |
/* |
| 468 |
* Read the section headers to find the address of the _gp |
| 469 |
* symbol (for MIPS): |
| 470 |
*/ |
| 471 |
|
| 472 |
for (i=0; i<eshnum; i++) { |
| 473 |
int sh_name, sh_type, sh_flags, sh_link, sh_info, sh_entsize; |
| 474 |
uint64_t sh_addr, sh_size, sh_addralign; |
| 475 |
off_t sh_offset; |
| 476 |
int n_entries; /* for reading the symbol / string tables */ |
| 477 |
|
| 478 |
/* debug("section header %i at %016"PRIx64"\n", i, |
| 479 |
(uint64_t) eshoff+i*eshentsize); */ |
| 480 |
|
| 481 |
fseek(f, eshoff + i * eshentsize, SEEK_SET); |
| 482 |
|
| 483 |
if (elf64) { |
| 484 |
len = fread(&shdr64, 1, sizeof(Elf64_Shdr), f); |
| 485 |
if (len != sizeof(Elf64_Shdr)) { |
| 486 |
fprintf(stderr, "couldn't read header\n"); |
| 487 |
exit(1); |
| 488 |
} |
| 489 |
unencode(sh_name, &shdr64.sh_name, Elf64_Half); |
| 490 |
unencode(sh_type, &shdr64.sh_type, Elf64_Half); |
| 491 |
unencode(sh_flags, &shdr64.sh_flags, Elf64_Xword); |
| 492 |
unencode(sh_addr, &shdr64.sh_addr, Elf64_Addr); |
| 493 |
unencode(sh_offset, &shdr64.sh_offset, Elf64_Off); |
| 494 |
unencode(sh_size, &shdr64.sh_size, Elf64_Xword); |
| 495 |
unencode(sh_link, &shdr64.sh_link, Elf64_Half); |
| 496 |
unencode(sh_info, &shdr64.sh_info, Elf64_Half); |
| 497 |
unencode(sh_addralign, &shdr64.sh_addralign, |
| 498 |
Elf64_Xword); |
| 499 |
unencode(sh_entsize, &shdr64.sh_entsize, Elf64_Xword); |
| 500 |
} else { |
| 501 |
len = fread(&shdr32, 1, sizeof(Elf32_Shdr), f); |
| 502 |
if (len != sizeof(Elf32_Shdr)) { |
| 503 |
fprintf(stderr, "couldn't read header\n"); |
| 504 |
exit(1); |
| 505 |
} |
| 506 |
unencode(sh_name, &shdr32.sh_name, Elf32_Word); |
| 507 |
unencode(sh_type, &shdr32.sh_type, Elf32_Word); |
| 508 |
unencode(sh_flags, &shdr32.sh_flags, Elf32_Word); |
| 509 |
unencode(sh_addr, &shdr32.sh_addr, Elf32_Addr); |
| 510 |
unencode(sh_offset, &shdr32.sh_offset, Elf32_Off); |
| 511 |
unencode(sh_size, &shdr32.sh_size, Elf32_Word); |
| 512 |
unencode(sh_link, &shdr32.sh_link, Elf32_Word); |
| 513 |
unencode(sh_info, &shdr32.sh_info, Elf32_Word); |
| 514 |
unencode(sh_addralign, &shdr32.sh_addralign,Elf32_Word); |
| 515 |
unencode(sh_entsize, &shdr32.sh_entsize, Elf32_Word); |
| 516 |
} |
| 517 |
|
| 518 |
/* debug("sh_name=%04lx, sh_type=%08lx, sh_flags=%08lx" |
| 519 |
" sh_size=%06lx sh_entsize=%03lx\n", |
| 520 |
(long)sh_name, (long)sh_type, (long)sh_flags, |
| 521 |
(long)sh_size, (long)sh_entsize); */ |
| 522 |
|
| 523 |
/* Perhaps it is bad to reuse sh_entsize like this? TODO */ |
| 524 |
if (elf64) |
| 525 |
sh_entsize = sizeof(Elf64_Sym); |
| 526 |
else |
| 527 |
sh_entsize = sizeof(Elf32_Sym); |
| 528 |
|
| 529 |
if (sh_type == SHT_SYMTAB) { |
| 530 |
size_t len; |
| 531 |
n_entries = sh_size / sh_entsize; |
| 532 |
|
| 533 |
fseek(f, sh_offset, SEEK_SET); |
| 534 |
|
| 535 |
if (elf64) { |
| 536 |
if (symbols_sym64 != NULL) |
| 537 |
free(symbols_sym64); |
| 538 |
symbols_sym64 = malloc(sh_size); |
| 539 |
if (symbols_sym64 == NULL) { |
| 540 |
fprintf(stderr, "out of memory\n"); |
| 541 |
exit(1); |
| 542 |
} |
| 543 |
|
| 544 |
len = fread(symbols_sym64, 1, sh_entsize * |
| 545 |
n_entries, f); |
| 546 |
} else { |
| 547 |
if (symbols_sym32 != NULL) |
| 548 |
free(symbols_sym32); |
| 549 |
symbols_sym32 = malloc(sh_size); |
| 550 |
if (symbols_sym32 == NULL) { |
| 551 |
fprintf(stderr, "out of memory\n"); |
| 552 |
exit(1); |
| 553 |
} |
| 554 |
|
| 555 |
len = fread(symbols_sym32, 1, |
| 556 |
sh_entsize * n_entries, f); |
| 557 |
} |
| 558 |
|
| 559 |
if (len != sh_size) { |
| 560 |
fprintf(stderr, "could not read symbols from " |
| 561 |
"%s\n", filename); |
| 562 |
exit(1); |
| 563 |
} |
| 564 |
|
| 565 |
debug("%i symbol entries at 0x%"PRIx64"\n", |
| 566 |
(int) n_entries, (uint64_t) sh_offset); |
| 567 |
|
| 568 |
n_symbols = n_entries; |
| 569 |
} |
| 570 |
|
| 571 |
/* |
| 572 |
* TODO: This is incorrect, there may be several strtab |
| 573 |
* sections. |
| 574 |
* |
| 575 |
* For now, the simple/stupid guess that the largest string |
| 576 |
* table is the one to use seems to be good enough. |
| 577 |
*/ |
| 578 |
|
| 579 |
if (sh_type == SHT_STRTAB && sh_size > symbol_length) { |
| 580 |
size_t len; |
| 581 |
|
| 582 |
if (symbol_strings != NULL) |
| 583 |
free(symbol_strings); |
| 584 |
|
| 585 |
symbol_strings = malloc(sh_size + 1); |
| 586 |
if (symbol_strings == NULL) { |
| 587 |
fprintf(stderr, "out of memory\n"); |
| 588 |
exit(1); |
| 589 |
} |
| 590 |
|
| 591 |
fseek(f, sh_offset, SEEK_SET); |
| 592 |
len = fread(symbol_strings, 1, sh_size, f); |
| 593 |
if (len != sh_size) { |
| 594 |
fprintf(stderr, "could not read symbols from " |
| 595 |
"%s\n", filename); |
| 596 |
exit(1); |
| 597 |
} |
| 598 |
|
| 599 |
debug("%i bytes of symbol strings at 0x%"PRIx64"\n", |
| 600 |
(int) sh_size, (uint64_t) sh_offset); |
| 601 |
|
| 602 |
symbol_strings[sh_size] = '\0'; |
| 603 |
symbol_length = sh_size; |
| 604 |
} |
| 605 |
} |
| 606 |
|
| 607 |
fclose(f); |
| 608 |
|
| 609 |
/* Decode symbols: */ |
| 610 |
if (symbol_strings != NULL) { |
| 611 |
for (i=0; i<n_symbols; i++) { |
| 612 |
uint64_t st_name, addr, size; |
| 613 |
int st_info; |
| 614 |
|
| 615 |
if (elf64) { |
| 616 |
sym64 = symbols_sym64[i]; |
| 617 |
unencode(st_name, &sym64.st_name, Elf64_Half); |
| 618 |
unencode(st_info, &sym64.st_info, Elf_Byte); |
| 619 |
unencode(addr, &sym64.st_value, Elf64_Addr); |
| 620 |
unencode(size, &sym64.st_size, Elf64_Xword); |
| 621 |
} else { |
| 622 |
sym32 = symbols_sym32[i]; |
| 623 |
unencode(st_name, &sym32.st_name, Elf32_Word); |
| 624 |
unencode(st_info, &sym32.st_info, Elf_Byte); |
| 625 |
unencode(addr, &sym32.st_value, Elf32_Word); |
| 626 |
unencode(size, &sym32.st_size, Elf32_Word); |
| 627 |
} |
| 628 |
|
| 629 |
/* debug("symbol info=0x%02x addr=0x%016"PRIx64 |
| 630 |
" (%i) '%s'\n", st_info, (uint64_t) addr, |
| 631 |
st_name, symbol_strings + st_name); */ |
| 632 |
|
| 633 |
if (size == 0) |
| 634 |
size ++; |
| 635 |
|
| 636 |
if (addr != 0) /* && ((st_info >> 4) & 0xf) |
| 637 |
>= STB_GLOBAL) */ { |
| 638 |
/* debug("symbol info=0x%02x addr=0x%016"PRIx64 |
| 639 |
" '%s'\n", st_info, (uint64_t) addr, |
| 640 |
symbol_strings + st_name); */ |
| 641 |
add_symbol_name(&m->symbol_context, |
| 642 |
addr, size, symbol_strings + st_name, |
| 643 |
0, -1); |
| 644 |
} |
| 645 |
|
| 646 |
if (strcmp(symbol_strings + st_name, "_gp") == 0) { |
| 647 |
debug("found _gp address: 0x"); |
| 648 |
if (elf64) |
| 649 |
debug("%016"PRIx64"\n", (uint64_t)addr); |
| 650 |
else |
| 651 |
debug("%08"PRIx32"\n", (uint32_t)addr); |
| 652 |
*gpp = addr; |
| 653 |
} |
| 654 |
} |
| 655 |
} |
| 656 |
|
| 657 |
*entrypointp = eentry; |
| 658 |
|
| 659 |
if (encoding == ELFDATA2LSB) |
| 660 |
*byte_order = EMUL_LITTLE_ENDIAN; |
| 661 |
else |
| 662 |
*byte_order = EMUL_BIG_ENDIAN; |
| 663 |
|
| 664 |
if (elf64 && arch == ARCH_PPC) { |
| 665 |
/* |
| 666 |
* Special case for 64-bit PPC ELFs: |
| 667 |
* |
| 668 |
* The ELF starting symbol points to a ".opd" section |
| 669 |
* which contains a function descriptor: |
| 670 |
* |
| 671 |
* uint64_t start; |
| 672 |
* uint64_t toc_base; |
| 673 |
* uint64_t something_else; (?) |
| 674 |
*/ |
| 675 |
int res; |
| 676 |
unsigned char b[sizeof(uint64_t)]; |
| 677 |
uint64_t toc_base; |
| 678 |
|
| 679 |
debug("PPC64: "); |
| 680 |
|
| 681 |
res = m->cpus[0]->memory_rw(m->cpus[0], mem, eentry, b, |
| 682 |
sizeof(b), MEM_READ, NO_EXCEPTIONS); |
| 683 |
if (!res) |
| 684 |
debug(" [WARNING: could not read memory?] "); |
| 685 |
|
| 686 |
/* PPC are always big-endian: */ |
| 687 |
*entrypointp = ((uint64_t)b[0] << 56) + |
| 688 |
((uint64_t)b[1] << 48) + ((uint64_t)b[2] << 40) + |
| 689 |
((uint64_t)b[3] << 32) + ((uint64_t)b[4] << 24) + |
| 690 |
((uint64_t)b[5] << 16) + ((uint64_t)b[6] << 8) + |
| 691 |
(uint64_t)b[7]; |
| 692 |
|
| 693 |
res = m->cpus[0]->memory_rw(m->cpus[0], mem, eentry + 8, |
| 694 |
b, sizeof(b), MEM_READ, NO_EXCEPTIONS); |
| 695 |
if (!res) |
| 696 |
fatal(" [WARNING: could not read memory?] "); |
| 697 |
|
| 698 |
toc_base = ((uint64_t)b[0] << 56) + |
| 699 |
((uint64_t)b[1] << 48) + ((uint64_t)b[2] << 40) + |
| 700 |
((uint64_t)b[3] << 32) + ((uint64_t)b[4] << 24) + |
| 701 |
((uint64_t)b[5] << 16) + ((uint64_t)b[6] << 8) + |
| 702 |
(uint64_t)b[7]; |
| 703 |
|
| 704 |
debug("entrypoint 0x%016"PRIx64", toc_base 0x%016"PRIx64"\n", |
| 705 |
(uint64_t) *entrypointp, (uint64_t) toc_base); |
| 706 |
if (tocp != NULL) |
| 707 |
*tocp = toc_base; |
| 708 |
} |
| 709 |
|
| 710 |
n_executables_loaded ++; |
| 711 |
} |
| 712 |
|
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