1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490
|
#ifndef DWARF_I_H
#define DWARF_I_H
/* This file contains definitions that cannot be used in code outside
of libunwind. In particular, most inline functions are here
because otherwise they'd generate unresolved references when the
files are compiled with inlining disabled. */
#include "dwarf.h"
#include "libunwind_i.h"
/* Unless we are told otherwise, assume that a "machine address" is
the size of an unw_word_t. */
#ifndef dwarf_addr_size
# define dwarf_addr_size(as) (sizeof (unw_word_t))
#endif
#ifndef dwarf_to_unw_regnum
# define dwarf_to_unw_regnum_map UNW_OBJ (dwarf_to_unw_regnum_map)
extern const uint8_t dwarf_to_unw_regnum_map[DWARF_REGNUM_MAP_LENGTH];
/* REG is evaluated multiple times; it better be side-effects free! */
# define dwarf_to_unw_regnum(reg) \
(((reg) <= DWARF_REGNUM_MAP_LENGTH) ? dwarf_to_unw_regnum_map[reg] : 0)
#endif
#ifdef UNW_LOCAL_ONLY
/* In the local-only case, we can let the compiler directly access
memory and don't need to worry about differing byte-order. */
typedef union __attribute__ ((packed))
{
int8_t s8;
int16_t s16;
int32_t s32;
int64_t s64;
uint8_t u8;
uint16_t u16;
uint32_t u32;
uint64_t u64;
void *ptr;
}
dwarf_misaligned_value_t;
static inline int
dwarf_reads8 (unw_addr_space_t as, unw_accessors_t *a, unw_word_t *addr,
int8_t *val, void *arg)
{
dwarf_misaligned_value_t *mvp = (void *) (uintptr_t) *addr;
*val = mvp->s8;
*addr += sizeof (mvp->s8);
return 0;
}
static inline int
dwarf_reads16 (unw_addr_space_t as, unw_accessors_t *a, unw_word_t *addr,
int16_t *val, void *arg)
{
dwarf_misaligned_value_t *mvp = (void *) (uintptr_t) *addr;
*val = mvp->s16;
*addr += sizeof (mvp->s16);
return 0;
}
static inline int
dwarf_reads32 (unw_addr_space_t as, unw_accessors_t *a, unw_word_t *addr,
int32_t *val, void *arg)
{
dwarf_misaligned_value_t *mvp = (void *) (uintptr_t) *addr;
*val = mvp->s32;
*addr += sizeof (mvp->s32);
return 0;
}
static inline int
dwarf_reads64 (unw_addr_space_t as, unw_accessors_t *a, unw_word_t *addr,
int64_t *val, void *arg)
{
dwarf_misaligned_value_t *mvp = (void *) (uintptr_t) *addr;
*val = mvp->s64;
*addr += sizeof (mvp->s64);
return 0;
}
static inline int
dwarf_readu8 (unw_addr_space_t as, unw_accessors_t *a, unw_word_t *addr,
uint8_t *val, void *arg)
{
dwarf_misaligned_value_t *mvp = (void *) (uintptr_t) *addr;
*val = mvp->u8;
*addr += sizeof (mvp->u8);
return 0;
}
static inline int
dwarf_readu16 (unw_addr_space_t as, unw_accessors_t *a, unw_word_t *addr,
uint16_t *val, void *arg)
{
dwarf_misaligned_value_t *mvp = (void *) (uintptr_t) *addr;
*val = mvp->u16;
*addr += sizeof (mvp->u16);
return 0;
}
static inline int
dwarf_readu32 (unw_addr_space_t as, unw_accessors_t *a, unw_word_t *addr,
uint32_t *val, void *arg)
{
dwarf_misaligned_value_t *mvp = (void *) (uintptr_t) *addr;
*val = mvp->u32;
*addr += sizeof (mvp->u32);
return 0;
}
static inline int
dwarf_readu64 (unw_addr_space_t as, unw_accessors_t *a, unw_word_t *addr,
uint64_t *val, void *arg)
{
dwarf_misaligned_value_t *mvp = (void *) (uintptr_t) *addr;
*val = mvp->u64;
*addr += sizeof (mvp->u64);
return 0;
}
#else /* !UNW_LOCAL_ONLY */
static inline int
dwarf_readu8 (unw_addr_space_t as, unw_accessors_t *a, unw_word_t *addr,
uint8_t *valp, void *arg)
{
unw_word_t val, aligned_addr = *addr & -sizeof (unw_word_t);
unw_word_t off = *addr - aligned_addr;
int ret;
*addr += 1;
ret = (*a->access_mem) (as, aligned_addr, &val, 0, arg);
#if __BYTE_ORDER == __LITTLE_ENDIAN
val >>= 8*off;
#else
val >>= 8*(sizeof (unw_word_t) - 1 - off);
#endif
*valp = (uint8_t) val;
return ret;
}
static inline int
dwarf_readu16 (unw_addr_space_t as, unw_accessors_t *a, unw_word_t *addr,
uint16_t *val, void *arg)
{
uint8_t v0, v1;
int ret;
if ((ret = dwarf_readu8 (as, a, addr, &v0, arg)) < 0
|| (ret = dwarf_readu8 (as, a, addr, &v1, arg)) < 0)
return ret;
if (tdep_big_endian (as))
*val = (uint16_t) v0 << 8 | v1;
else
*val = (uint16_t) v1 << 8 | v0;
return 0;
}
static inline int
dwarf_readu32 (unw_addr_space_t as, unw_accessors_t *a, unw_word_t *addr,
uint32_t *val, void *arg)
{
uint16_t v0, v1;
int ret;
if ((ret = dwarf_readu16 (as, a, addr, &v0, arg)) < 0
|| (ret = dwarf_readu16 (as, a, addr, &v1, arg)) < 0)
return ret;
if (tdep_big_endian (as))
*val = (uint32_t) v0 << 16 | v1;
else
*val = (uint32_t) v1 << 16 | v0;
return 0;
}
static inline int
dwarf_readu64 (unw_addr_space_t as, unw_accessors_t *a, unw_word_t *addr,
uint64_t *val, void *arg)
{
uint32_t v0, v1;
int ret;
if ((ret = dwarf_readu32 (as, a, addr, &v0, arg)) < 0
|| (ret = dwarf_readu32 (as, a, addr, &v1, arg)) < 0)
return ret;
if (tdep_big_endian (as))
*val = (uint64_t) v0 << 32 | v1;
else
*val = (uint64_t) v1 << 32 | v0;
return 0;
}
static inline int
dwarf_reads8 (unw_addr_space_t as, unw_accessors_t *a, unw_word_t *addr,
int8_t *val, void *arg)
{
uint8_t uval;
int ret;
if ((ret = dwarf_readu8 (as, a, addr, &uval, arg)) < 0)
return ret;
*val = (int8_t) uval;
return 0;
}
static inline int
dwarf_reads16 (unw_addr_space_t as, unw_accessors_t *a, unw_word_t *addr,
int16_t *val, void *arg)
{
uint16_t uval;
int ret;
if ((ret = dwarf_readu16 (as, a, addr, &uval, arg)) < 0)
return ret;
*val = (int16_t) uval;
return 0;
}
static inline int
dwarf_reads32 (unw_addr_space_t as, unw_accessors_t *a, unw_word_t *addr,
int32_t *val, void *arg)
{
uint32_t uval;
int ret;
if ((ret = dwarf_readu32 (as, a, addr, &uval, arg)) < 0)
return ret;
*val = (int32_t) uval;
return 0;
}
static inline int
dwarf_reads64 (unw_addr_space_t as, unw_accessors_t *a, unw_word_t *addr,
int64_t *val, void *arg)
{
uint64_t uval;
int ret;
if ((ret = dwarf_readu64 (as, a, addr, &uval, arg)) < 0)
return ret;
*val = (int64_t) uval;
return 0;
}
#endif /* !UNW_LOCAL_ONLY */
static inline int
dwarf_readw (unw_addr_space_t as, unw_accessors_t *a, unw_word_t *addr,
unw_word_t *val, void *arg)
{
uint32_t u32;
uint64_t u64;
int ret;
switch (dwarf_addr_size (as))
{
case 4:
ret = dwarf_readu32 (as, a, addr, &u32, arg);
if (ret < 0)
return ret;
*val = u32;
return ret;
case 8:
ret = dwarf_readu64 (as, a, addr, &u64, arg);
if (ret < 0)
return ret;
*val = u64;
return ret;
default:
abort ();
}
}
/* Read an unsigned "little-endian base 128" value. See Chapter 7.6
of DWARF spec v3. */
static inline int
dwarf_read_uleb128 (unw_addr_space_t as, unw_accessors_t *a, unw_word_t *addr,
unw_word_t *valp, void *arg)
{
unw_word_t val = 0, shift = 0;
unsigned char byte;
int ret;
do
{
if ((ret = dwarf_readu8 (as, a, addr, &byte, arg)) < 0)
return ret;
val |= ((unw_word_t) byte & 0x7f) << shift;
shift += 7;
}
while (byte & 0x80);
*valp = val;
return 0;
}
/* Read a signed "little-endian base 128" value. See Chapter 7.6 of
DWARF spec v3. */
static inline int
dwarf_read_sleb128 (unw_addr_space_t as, unw_accessors_t *a, unw_word_t *addr,
unw_word_t *valp, void *arg)
{
unw_word_t val = 0, shift = 0;
unsigned char byte;
int ret;
do
{
if ((ret = dwarf_readu8 (as, a, addr, &byte, arg)) < 0)
return ret;
val |= ((unw_word_t) byte & 0x7f) << shift;
shift += 7;
}
while (byte & 0x80);
if (shift < 8 * sizeof (unw_word_t) && (byte & 0x40) != 0)
/* sign-extend negative value */
val |= ((unw_word_t) -1) << shift;
*valp = val;
return 0;
}
static ALWAYS_INLINE int
dwarf_read_encoded_pointer_inlined (unw_addr_space_t as, unw_accessors_t *a,
unw_word_t *addr, unsigned char encoding,
const unw_proc_info_t *pi,
unw_word_t *valp, void *arg)
{
unw_word_t val, initial_addr = *addr;
uint16_t uval16;
uint32_t uval32;
uint64_t uval64;
int16_t sval16;
int32_t sval32;
int64_t sval64;
int ret;
/* DW_EH_PE_omit and DW_EH_PE_aligned don't follow the normal
format/application encoding. Handle them first. */
if (encoding == DW_EH_PE_omit)
{
*valp = 0;
return 0;
}
else if (encoding == DW_EH_PE_aligned)
{
int size = dwarf_addr_size (as);
*addr = (initial_addr + size - 1) & -size;
return dwarf_readw (as, a, addr, valp, arg);
}
switch (encoding & DW_EH_PE_FORMAT_MASK)
{
case DW_EH_PE_ptr:
if ((ret = dwarf_readw (as, a, addr, &val, arg)) < 0)
return ret;
break;
case DW_EH_PE_uleb128:
if ((ret = dwarf_read_uleb128 (as, a, addr, &val, arg)) < 0)
return ret;
break;
case DW_EH_PE_udata2:
if ((ret = dwarf_readu16 (as, a, addr, &uval16, arg)) < 0)
return ret;
val = uval16;
break;
case DW_EH_PE_udata4:
if ((ret = dwarf_readu32 (as, a, addr, &uval32, arg)) < 0)
return ret;
val = uval32;
break;
case DW_EH_PE_udata8:
if ((ret = dwarf_readu64 (as, a, addr, &uval64, arg)) < 0)
return ret;
val = uval64;
break;
case DW_EH_PE_sleb128:
if ((ret = dwarf_read_uleb128 (as, a, addr, &val, arg)) < 0)
return ret;
break;
case DW_EH_PE_sdata2:
if ((ret = dwarf_reads16 (as, a, addr, &sval16, arg)) < 0)
return ret;
val = sval16;
break;
case DW_EH_PE_sdata4:
if ((ret = dwarf_reads32 (as, a, addr, &sval32, arg)) < 0)
return ret;
val = sval32;
break;
case DW_EH_PE_sdata8:
if ((ret = dwarf_reads64 (as, a, addr, &sval64, arg)) < 0)
return ret;
val = sval64;
break;
default:
Debug (1, "unexpected encoding format 0x%x\n",
encoding & DW_EH_PE_FORMAT_MASK);
return -UNW_EINVAL;
}
if (val == 0)
{
/* 0 is a special value and always absolute. */
*valp = 0;
return 0;
}
switch (encoding & DW_EH_PE_APPL_MASK)
{
case DW_EH_PE_absptr:
break;
case DW_EH_PE_pcrel:
val += initial_addr;
break;
case DW_EH_PE_datarel:
/* XXX For now, assume that data-relative addresses are relative
to the global pointer. */
val += pi->gp;
break;
case DW_EH_PE_funcrel:
val += pi->start_ip;
break;
case DW_EH_PE_textrel:
/* XXX For now we don't support text-rel values. If there is a
platform which needs this, we probably would have to add a
"segbase" member to unw_proc_info_t. */
default:
Debug (1, "unexpected application type 0x%x\n",
encoding & DW_EH_PE_APPL_MASK);
return -UNW_EINVAL;
}
/* Trim off any extra bits. Assume that sign extension isn't
required; the only place it is needed is MIPS kernel space
addresses. */
if (sizeof (val) > dwarf_addr_size (as))
{
assert (dwarf_addr_size (as) == 4);
val = (uint32_t) val;
}
if (encoding & DW_EH_PE_indirect)
{
unw_word_t indirect_addr = val;
if ((ret = dwarf_readw (as, a, &indirect_addr, &val, arg)) < 0)
return ret;
}
*valp = val;
return 0;
}
#endif /* DWARF_I_H */
|