libunwind/src/AddressSpace.hpp

   1 //===------------------------- AddressSpace.hpp ---------------------------===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //
   8 // Abstracts accessing local vs remote address spaces.
   9 //
  10 //===----------------------------------------------------------------------===//
  11
  12 #ifndef __ADDRESSSPACE_HPP__
  13 #define __ADDRESSSPACE_HPP__
  14
  15 #include <stdint.h>
  16 #include <stdio.h>
  17 #include <stdlib.h>
  18 #include <string.h>
  19
  20 #ifndef _LIBUNWIND_USE_DLADDR
  21   #if !defined(_LIBUNWIND_IS_BAREMETAL) && !defined(_WIN32)
  22     #define _LIBUNWIND_USE_DLADDR 1
  23   #else
  24     #define _LIBUNWIND_USE_DLADDR 0
  25   #endif
  26 #endif
  27
  28 #if _LIBUNWIND_USE_DLADDR
  29 #include <dlfcn.h>
  30 #if defined(__unix__) && defined(__ELF__) && defined(_LIBUNWIND_HAS_COMMENT_LIB_PRAGMA)
  31 #pragma comment(lib, "dl")
  32 #endif
  33 #endif
  34
  35 #ifdef __APPLE__
  36 #include <mach-o/getsect.h>
  37 namespace libunwind {
  38    bool checkKeyMgrRegisteredFDEs(uintptr_t targetAddr, void *&fde);
  39 }
  40 #endif
  41
  42 #include "libunwind.h"
  43 #include "config.h"
  44 #include "dwarf2.h"
  45 #include "EHHeaderParser.hpp"
  46 #include "Registers.hpp"
  47
  48 #ifdef __APPLE__
  49
  50   struct dyld_unwind_sections
  51   {
  52     const struct mach_header*   mh;
  53     const void*                 dwarf_section;
  54     uintptr_t                   dwarf_section_length;
  55     const void*                 compact_unwind_section;
  56     uintptr_t                   compact_unwind_section_length;
  57   };
  58   #if (defined(__MAC_OS_X_VERSION_MIN_REQUIRED) \
  59                                  && (__MAC_OS_X_VERSION_MIN_REQUIRED >= 1070)) \
  60       || defined(__IPHONE_OS_VERSION_MIN_REQUIRED)
  61     // In 10.7.0 or later, libSystem.dylib implements this function.
  62     extern "C" bool _dyld_find_unwind_sections(void *, dyld_unwind_sections *);
  63   #else
  64     // In 10.6.x and earlier, we need to implement this functionality. Note
  65     // that this requires a newer version of libmacho (from cctools) than is
  66     // present in libSystem on 10.6.x (for getsectiondata).
  67     static inline bool _dyld_find_unwind_sections(void* addr,
  68                                                     dyld_unwind_sections* info) {
  69       // Find mach-o image containing address.
  70       Dl_info dlinfo;
  71       if (!dladdr(addr, &dlinfo))
  72         return false;
  73 #if __LP64__
  74       const struct mach_header_64 *mh = (const struct mach_header_64 *)dlinfo.dli_fbase;
  75 #else
  76       const struct mach_header *mh = (const struct mach_header *)dlinfo.dli_fbase;
  77 #endif
  78
  79       // Initialize the return struct
  80       info->mh = (const struct mach_header *)mh;
  81       info->dwarf_section = getsectiondata(mh, "__TEXT", "__eh_frame", &info->dwarf_section_length);
  82       info->compact_unwind_section = getsectiondata(mh, "__TEXT", "__unwind_info", &info->compact_unwind_section_length);
  83
  84       if (!info->dwarf_section) {
  85         info->dwarf_section_length = 0;
  86       }
  87
  88       if (!info->compact_unwind_section) {
  89         info->compact_unwind_section_length = 0;
  90       }
  91
  92       return true;
  93     }
  94   #endif
  95
  96 #elif defined(_LIBUNWIND_SUPPORT_DWARF_UNWIND) && defined(_LIBUNWIND_IS_BAREMETAL)
  97
  98 // When statically linked on bare-metal, the symbols for the EH table are looked
  99 // up without going through the dynamic loader.
 100
 101 // The following linker script may be used to produce the necessary sections and symbols.
 102 // Unless the --eh-frame-hdr linker option is provided, the section is not generated
 103 // and does not take space in the output file.
 104 //
 105 //   .eh_frame :
 106 //   {
 107 //       __eh_frame_start = .;
 108 //       KEEP(*(.eh_frame))
 109 //       __eh_frame_end = .;
 110 //   }
 111 //
 112 //   .eh_frame_hdr :
 113 //   {
 114 //       KEEP(*(.eh_frame_hdr))
 115 //   }
 116 //
 117 //   __eh_frame_hdr_start = SIZEOF(.eh_frame_hdr) > 0 ? ADDR(.eh_frame_hdr) : 0;
 118 //   __eh_frame_hdr_end = SIZEOF(.eh_frame_hdr) > 0 ? . : 0;
 119
 120 extern char __eh_frame_start;
 121 extern char __eh_frame_end;
 122
 123 #if defined(_LIBUNWIND_SUPPORT_DWARF_INDEX)
 124 extern char __eh_frame_hdr_start;
 125 extern char __eh_frame_hdr_end;
 126 #endif
 127
 128 #elif defined(_LIBUNWIND_ARM_EHABI) && defined(_LIBUNWIND_IS_BAREMETAL)
 129
 130 // When statically linked on bare-metal, the symbols for the EH table are looked
 131 // up without going through the dynamic loader.
 132 extern char __exidx_start;
 133 extern char __exidx_end;
 134
 135 #elif defined(_LIBUNWIND_ARM_EHABI) || defined(_LIBUNWIND_SUPPORT_DWARF_UNWIND)
 136
 137 // ELF-based systems may use dl_iterate_phdr() to access sections
 138 // containing unwinding information. The ElfW() macro for pointer-size
 139 // independent ELF header traversal is not provided by <link.h> on some
 140 // systems (e.g., FreeBSD). On these systems the data structures are
 141 // just called Elf_XXX. Define ElfW() locally.
 142 #ifndef _WIN32
 143 #include <link.h>
 144 #else
 145 #include <windows.h>
 146 #include <psapi.h>
 147 #endif
 148 #if !defined(ElfW)
 149 #define ElfW(type) Elf_##type
 150 #endif
 151
 152 #endif
 153
 154 namespace libunwind {
 155
 156 /// Used by findUnwindSections() to return info about needed sections.
 157 struct UnwindInfoSections {
 158 #if defined(_LIBUNWIND_SUPPORT_DWARF_UNWIND) || defined(_LIBUNWIND_SUPPORT_DWARF_INDEX) ||       \
 159     defined(_LIBUNWIND_SUPPORT_COMPACT_UNWIND)
 160   // No dso_base for SEH or ARM EHABI.
 161   uintptr_t       dso_base;
 162 #endif
 163 #if defined(_LIBUNWIND_SUPPORT_DWARF_UNWIND)
 164   uintptr_t       dwarf_section;
 165   uintptr_t       dwarf_section_length;
 166 #endif
 167 #if defined(_LIBUNWIND_SUPPORT_DWARF_INDEX)
 168   uintptr_t       dwarf_index_section;
 169   uintptr_t       dwarf_index_section_length;
 170 #endif
 171 #if defined(_LIBUNWIND_SUPPORT_COMPACT_UNWIND)
 172   uintptr_t       compact_unwind_section;
 173   uintptr_t       compact_unwind_section_length;
 174 #endif
 175 #if defined(_LIBUNWIND_ARM_EHABI)
 176   uintptr_t       arm_section;
 177   uintptr_t       arm_section_length;
 178 #endif
 179 };
 180
 181
 182 /// LocalAddressSpace is used as a template parameter to UnwindCursor when
 183 /// unwinding a thread in the same process.  The wrappers compile away,
 184 /// making local unwinds fast.
 185 class _LIBUNWIND_HIDDEN LocalAddressSpace {
 186 public:
 187   typedef uintptr_t pint_t;
 188   typedef intptr_t  sint_t;
 189   uint8_t         get8(pint_t addr) {
 190     uint8_t val;
 191     memcpy(&val, (void *)addr, sizeof(val));
 192     return val;
 193   }
 194   uint16_t         get16(pint_t addr) {
 195     uint16_t val;
 196     memcpy(&val, (void *)addr, sizeof(val));
 197     return val;
 198   }
 199   uint32_t         get32(pint_t addr) {
 200     uint32_t val;
 201     memcpy(&val, (void *)addr, sizeof(val));
 202     return val;
 203   }
 204   uint64_t         get64(pint_t addr) {
 205     uint64_t val;
 206     memcpy(&val, (void *)addr, sizeof(val));
 207     return val;
 208   }
 209   double           getDouble(pint_t addr) {
 210     double val;
 211     memcpy(&val, (void *)addr, sizeof(val));
 212     return val;
 213   }
 214   v128             getVector(pint_t addr) {
 215     v128 val;
 216     memcpy(&val, (void *)addr, sizeof(val));
 217     return val;
 218   }
 219   uintptr_t       getP(pint_t addr);
 220   uint64_t        getRegister(pint_t addr);
 221   static uint64_t getULEB128(pint_t &addr, pint_t end);
 222   static int64_t  getSLEB128(pint_t &addr, pint_t end);
 223
 224   pint_t getEncodedP(pint_t &addr, pint_t end, uint8_t encoding,
 225                      pint_t datarelBase = 0);
 226   bool findFunctionName(pint_t addr, char *buf, size_t bufLen,
 227                         unw_word_t *offset);
 228   bool findUnwindSections(pint_t targetAddr, UnwindInfoSections &info);
 229   bool findOtherFDE(pint_t targetAddr, pint_t &fde);
 230
 231   static LocalAddressSpace sThisAddressSpace;
 232 };
 233
 234 inline uintptr_t LocalAddressSpace::getP(pint_t addr) {
 235 #if __SIZEOF_POINTER__ == 8
 236   return get64(addr);
 237 #else
 238   return get32(addr);
 239 #endif
 240 }
 241
 242 inline uint64_t LocalAddressSpace::getRegister(pint_t addr) {
 243 #if __SIZEOF_POINTER__ == 8 || defined(__mips64)
 244   return get64(addr);
 245 #else
 246   return get32(addr);
 247 #endif
 248 }
 249
 250 /// Read a ULEB128 into a 64-bit word.
 251 inline uint64_t LocalAddressSpace::getULEB128(pint_t &addr, pint_t end) {
 252   const uint8_t *p = (uint8_t *)addr;
 253   const uint8_t *pend = (uint8_t *)end;
 254   uint64_t result = 0;
 255   int bit = 0;
 256   do {
 257     uint64_t b;
 258
 259     if (p == pend)
 260       _LIBUNWIND_ABORT("truncated uleb128 expression");
 261
 262     b = *p & 0x7f;
 263
 264     if (bit >= 64 || b << bit >> bit != b) {
 265       _LIBUNWIND_ABORT("malformed uleb128 expression");
 266     } else {
 267       result |= b << bit;
 268       bit += 7;
 269     }
 270   } while (*p++ >= 0x80);
 271   addr = (pint_t) p;
 272   return result;
 273 }
 274
 275 /// Read a SLEB128 into a 64-bit word.
 276 inline int64_t LocalAddressSpace::getSLEB128(pint_t &addr, pint_t end) {
 277   const uint8_t *p = (uint8_t *)addr;
 278   const uint8_t *pend = (uint8_t *)end;
 279   int64_t result = 0;
 280   int bit = 0;
 281   uint8_t byte;
 282   do {
 283     if (p == pend)
 284       _LIBUNWIND_ABORT("truncated sleb128 expression");
 285     byte = *p++;
 286     result |= ((byte & 0x7f) << bit);
 287     bit += 7;
 288   } while (byte & 0x80);
 289   // sign extend negative numbers
 290   if ((byte & 0x40) != 0)
 291     result |= (-1ULL) << bit;
 292   addr = (pint_t) p;
 293   return result;
 294 }
 295
 296 inline LocalAddressSpace::pint_t
 297 LocalAddressSpace::getEncodedP(pint_t &addr, pint_t end, uint8_t encoding,
 298                                pint_t datarelBase) {
 299   pint_t startAddr = addr;
 300   const uint8_t *p = (uint8_t *)addr;
 301   pint_t result;
 302
 303   // first get value
 304   switch (encoding & 0x0F) {
 305   case DW_EH_PE_ptr:
 306     result = getP(addr);
 307     p += sizeof(pint_t);
 308     addr = (pint_t) p;
 309     break;
 310   case DW_EH_PE_uleb128:
 311     result = (pint_t)getULEB128(addr, end);
 312     break;
 313   case DW_EH_PE_udata2:
 314     result = get16(addr);
 315     p += 2;
 316     addr = (pint_t) p;
 317     break;
 318   case DW_EH_PE_udata4:
 319     result = get32(addr);
 320     p += 4;
 321     addr = (pint_t) p;
 322     break;
 323   case DW_EH_PE_udata8:
 324     result = (pint_t)get64(addr);
 325     p += 8;
 326     addr = (pint_t) p;
 327     break;
 328   case DW_EH_PE_sleb128:
 329     result = (pint_t)getSLEB128(addr, end);
 330     break;
 331   case DW_EH_PE_sdata2:
 332     // Sign extend from signed 16-bit value.
 333     result = (pint_t)(int16_t)get16(addr);
 334     p += 2;
 335     addr = (pint_t) p;
 336     break;
 337   case DW_EH_PE_sdata4:
 338     // Sign extend from signed 32-bit value.
 339     result = (pint_t)(int32_t)get32(addr);
 340     p += 4;
 341     addr = (pint_t) p;
 342     break;
 343   case DW_EH_PE_sdata8:
 344     result = (pint_t)get64(addr);
 345     p += 8;
 346     addr = (pint_t) p;
 347     break;
 348   default:
 349     _LIBUNWIND_ABORT("unknown pointer encoding");
 350   }
 351
 352   // then add relative offset
 353   switch (encoding & 0x70) {
 354   case DW_EH_PE_absptr:
 355     // do nothing
 356     break;
 357   case DW_EH_PE_pcrel:
 358     result += startAddr;
 359     break;
 360   case DW_EH_PE_textrel:
 361     _LIBUNWIND_ABORT("DW_EH_PE_textrel pointer encoding not supported");
 362     break;
 363   case DW_EH_PE_datarel:
 364     // DW_EH_PE_datarel is only valid in a few places, so the parameter has a
 365     // default value of 0, and we abort in the event that someone calls this
 366     // function with a datarelBase of 0 and DW_EH_PE_datarel encoding.
 367     if (datarelBase == 0)
 368       _LIBUNWIND_ABORT("DW_EH_PE_datarel is invalid with a datarelBase of 0");
 369     result += datarelBase;
 370     break;
 371   case DW_EH_PE_funcrel:
 372     _LIBUNWIND_ABORT("DW_EH_PE_funcrel pointer encoding not supported");
 373     break;
 374   case DW_EH_PE_aligned:
 375     _LIBUNWIND_ABORT("DW_EH_PE_aligned pointer encoding not supported");
 376     break;
 377   default:
 378     _LIBUNWIND_ABORT("unknown pointer encoding");
 379     break;
 380   }
 381
 382   if (encoding & DW_EH_PE_indirect)
 383     result = getP(result);
 384
 385   return result;
 386 }
 387
 388 inline bool LocalAddressSpace::findUnwindSections(pint_t targetAddr,
 389                                                   UnwindInfoSections &info) {
 390 #ifdef __APPLE__
 391   dyld_unwind_sections dyldInfo;
 392   if (_dyld_find_unwind_sections((void *)targetAddr, &dyldInfo)) {
 393     info.dso_base                      = (uintptr_t)dyldInfo.mh;
 394  #if defined(_LIBUNWIND_SUPPORT_DWARF_UNWIND)
 395     info.dwarf_section                 = (uintptr_t)dyldInfo.dwarf_section;
 396     info.dwarf_section_length          = dyldInfo.dwarf_section_length;
 397  #endif
 398     info.compact_unwind_section        = (uintptr_t)dyldInfo.compact_unwind_section;
 399     info.compact_unwind_section_length = dyldInfo.compact_unwind_section_length;
 400     return true;
 401   }
 402 #elif defined(_LIBUNWIND_SUPPORT_DWARF_UNWIND) && defined(_LIBUNWIND_IS_BAREMETAL)
 403   // Bare metal is statically linked, so no need to ask the dynamic loader
 404   info.dwarf_section_length = (uintptr_t)(&__eh_frame_end - &__eh_frame_start);
 405   info.dwarf_section =        (uintptr_t)(&__eh_frame_start);
 406   _LIBUNWIND_TRACE_UNWINDING("findUnwindSections: section %p length %p",
 407                              (void *)info.dwarf_section, (void *)info.dwarf_section_length);
 408 #if defined(_LIBUNWIND_SUPPORT_DWARF_INDEX)
 409   info.dwarf_index_section =        (uintptr_t)(&__eh_frame_hdr_start);
 410   info.dwarf_index_section_length = (uintptr_t)(&__eh_frame_hdr_end - &__eh_frame_hdr_start);
 411   _LIBUNWIND_TRACE_UNWINDING("findUnwindSections: index section %p length %p",
 412                              (void *)info.dwarf_index_section, (void *)info.dwarf_index_section_length);
 413 #endif
 414   if (info.dwarf_section_length)
 415     return true;
 416 #elif defined(_LIBUNWIND_ARM_EHABI) && defined(_LIBUNWIND_IS_BAREMETAL)
 417   // Bare metal is statically linked, so no need to ask the dynamic loader
 418   info.arm_section =        (uintptr_t)(&__exidx_start);
 419   info.arm_section_length = (uintptr_t)(&__exidx_end - &__exidx_start);
 420   _LIBUNWIND_TRACE_UNWINDING("findUnwindSections: section %p length %p",
 421                              (void *)info.arm_section, (void *)info.arm_section_length);
 422   if (info.arm_section && info.arm_section_length)
 423     return true;
 424 #elif defined(_LIBUNWIND_SUPPORT_DWARF_UNWIND) && defined(_WIN32)
 425   HMODULE mods[1024];
 426   HANDLE process = GetCurrentProcess();
 427   DWORD needed;
 428
 429   if (!EnumProcessModules(process, mods, sizeof(mods), &needed))
 430     return false;
 431
 432   for (unsigned i = 0; i < (needed / sizeof(HMODULE)); i++) {
 433     PIMAGE_DOS_HEADER pidh = (PIMAGE_DOS_HEADER)mods[i];
 434     PIMAGE_NT_HEADERS pinh = (PIMAGE_NT_HEADERS)((BYTE *)pidh + pidh->e_lfanew);
 435     PIMAGE_FILE_HEADER pifh = (PIMAGE_FILE_HEADER)&pinh->FileHeader;
 436     PIMAGE_SECTION_HEADER pish = IMAGE_FIRST_SECTION(pinh);
 437     bool found_obj = false;
 438     bool found_hdr = false;
 439
 440     info.dso_base = (uintptr_t)mods[i];
 441     for (unsigned j = 0; j < pifh->NumberOfSections; j++, pish++) {
 442       uintptr_t begin = pish->VirtualAddress + (uintptr_t)mods[i];
 443       uintptr_t end = begin + pish->Misc.VirtualSize;
 444       if (!strncmp((const char *)pish->Name, ".text",
 445                    IMAGE_SIZEOF_SHORT_NAME)) {
 446         if (targetAddr >= begin && targetAddr < end)
 447           found_obj = true;
 448       } else if (!strncmp((const char *)pish->Name, ".eh_frame",
 449                           IMAGE_SIZEOF_SHORT_NAME)) {
 450         info.dwarf_section = begin;
 451         info.dwarf_section_length = pish->Misc.VirtualSize;
 452         found_hdr = true;
 453       }
 454       if (found_obj && found_hdr)
 455         return true;
 456     }
 457   }
 458   return false;
 459 #elif defined(_LIBUNWIND_SUPPORT_SEH_UNWIND) && defined(_WIN32)
 460   // Don't even bother, since Windows has functions that do all this stuff
 461   // for us.
 462   (void)targetAddr;
 463   (void)info;
 464   return true;
 465 #elif defined(_LIBUNWIND_ARM_EHABI) && defined(__BIONIC__) &&                  \
 466     (__ANDROID_API__ < 21)
 467   int length = 0;
 468   info.arm_section =
 469       (uintptr_t)dl_unwind_find_exidx((_Unwind_Ptr)targetAddr, &length);
 470   info.arm_section_length = (uintptr_t)length;
 471   if (info.arm_section && info.arm_section_length)
 472     return true;
 473 #elif defined(_LIBUNWIND_ARM_EHABI) || defined(_LIBUNWIND_SUPPORT_DWARF_UNWIND)
 474   struct dl_iterate_cb_data {
 475     LocalAddressSpace *addressSpace;
 476     UnwindInfoSections *sects;
 477     uintptr_t targetAddr;
 478   };
 479
 480   dl_iterate_cb_data cb_data = {this, &info, targetAddr};
 481   int found = dl_iterate_phdr(
 482       [](struct dl_phdr_info *pinfo, size_t, void *data) -> int {
 483         auto cbdata = static_cast<dl_iterate_cb_data *>(data);
 484         bool found_obj = false;
 485         bool found_hdr = false;
 486
 487         assert(cbdata);
 488         assert(cbdata->sects);
 489
 490         if (cbdata->targetAddr < pinfo->dlpi_addr) {
 491           return false;
 492         }
 493
 494 #if !defined(Elf_Half)
 495         typedef ElfW(Half) Elf_Half;
 496 #endif
 497 #if !defined(Elf_Phdr)
 498         typedef ElfW(Phdr) Elf_Phdr;
 499 #endif
 500 #if !defined(Elf_Addr) && defined(__ANDROID__)
 501         typedef ElfW(Addr) Elf_Addr;
 502 #endif
 503
 504  #if defined(_LIBUNWIND_SUPPORT_DWARF_UNWIND)
 505   #if !defined(_LIBUNWIND_SUPPORT_DWARF_INDEX)
 506    #error "_LIBUNWIND_SUPPORT_DWARF_UNWIND requires _LIBUNWIND_SUPPORT_DWARF_INDEX on this platform."
 507   #endif
 508         size_t object_length;
 509 #if defined(__ANDROID__)
 510         Elf_Addr image_base =
 511             pinfo->dlpi_phnum
 512                 ? reinterpret_cast<Elf_Addr>(pinfo->dlpi_phdr) -
 513                       reinterpret_cast<const Elf_Phdr *>(pinfo->dlpi_phdr)
 514                           ->p_offset
 515                 : 0;
 516 #endif
 517
 518         for (Elf_Half i = 0; i < pinfo->dlpi_phnum; i++) {
 519           const Elf_Phdr *phdr = &pinfo->dlpi_phdr[i];
 520           if (phdr->p_type == PT_LOAD) {
 521             uintptr_t begin = pinfo->dlpi_addr + phdr->p_vaddr;
 522 #if defined(__ANDROID__)
 523             if (pinfo->dlpi_addr == 0 && phdr->p_vaddr < image_base)
 524               begin = begin + image_base;
 525 #endif
 526             uintptr_t end = begin + phdr->p_memsz;
 527             if (cbdata->targetAddr >= begin && cbdata->targetAddr < end) {
 528               cbdata->sects->dso_base = begin;
 529               object_length = phdr->p_memsz;
 530               found_obj = true;
 531             }
 532           } else if (phdr->p_type == PT_GNU_EH_FRAME) {
 533             EHHeaderParser<LocalAddressSpace>::EHHeaderInfo hdrInfo;
 534             uintptr_t eh_frame_hdr_start = pinfo->dlpi_addr + phdr->p_vaddr;
 535 #if defined(__ANDROID__)
 536             if (pinfo->dlpi_addr == 0 && phdr->p_vaddr < image_base)
 537               eh_frame_hdr_start = eh_frame_hdr_start + image_base;
 538 #endif
 539             cbdata->sects->dwarf_index_section = eh_frame_hdr_start;
 540             cbdata->sects->dwarf_index_section_length = phdr->p_memsz;
 541             found_hdr = EHHeaderParser<LocalAddressSpace>::decodeEHHdr(
 542                 *cbdata->addressSpace, eh_frame_hdr_start, phdr->p_memsz,
 543                 hdrInfo);
 544             if (found_hdr)
 545               cbdata->sects->dwarf_section = hdrInfo.eh_frame_ptr;
 546           }
 547         }
 548
 549         if (found_obj && found_hdr) {
 550           cbdata->sects->dwarf_section_length = object_length;
 551           return true;
 552         } else {
 553           return false;
 554         }
 555  #else // defined(_LIBUNWIND_ARM_EHABI)
 556         for (Elf_Half i = 0; i < pinfo->dlpi_phnum; i++) {
 557           const Elf_Phdr *phdr = &pinfo->dlpi_phdr[i];
 558           if (phdr->p_type == PT_LOAD) {
 559             uintptr_t begin = pinfo->dlpi_addr + phdr->p_vaddr;
 560             uintptr_t end = begin + phdr->p_memsz;
 561             if (cbdata->targetAddr >= begin && cbdata->targetAddr < end)
 562               found_obj = true;
 563           } else if (phdr->p_type == PT_ARM_EXIDX) {
 564             uintptr_t exidx_start = pinfo->dlpi_addr + phdr->p_vaddr;
 565             cbdata->sects->arm_section = exidx_start;
 566             cbdata->sects->arm_section_length = phdr->p_memsz;
 567             found_hdr = true;
 568           }
 569         }
 570         return found_obj && found_hdr;
 571  #endif
 572       },
 573       &cb_data);
 574   return static_cast<bool>(found);
 575 #endif
 576
 577   return false;
 578 }
 579
 580
 581 inline bool LocalAddressSpace::findOtherFDE(pint_t targetAddr, pint_t &fde) {
 582 #ifdef __APPLE__
 583   return checkKeyMgrRegisteredFDEs(targetAddr, *((void**)&fde));
 584 #else
 585   // TO DO: if OS has way to dynamically register FDEs, check that.
 586   (void)targetAddr;
 587   (void)fde;
 588   return false;
 589 #endif
 590 }
 591
 592 inline bool LocalAddressSpace::findFunctionName(pint_t addr, char *buf,
 593                                                 size_t bufLen,
 594                                                 unw_word_t *offset) {
 595 #if _LIBUNWIND_USE_DLADDR
 596   Dl_info dyldInfo;
 597   if (dladdr((void *)addr, &dyldInfo)) {
 598     if (dyldInfo.dli_sname != NULL) {
 599       snprintf(buf, bufLen, "%s", dyldInfo.dli_sname);
 600       *offset = (addr - (pint_t) dyldInfo.dli_saddr);
 601       return true;
 602     }
 603   }
 604 #else
 605   (void)addr;
 606   (void)buf;
 607   (void)bufLen;
 608   (void)offset;
 609 #endif
 610   return false;
 611 }
 612
 613 } // namespace libunwind
 614
 615 #endif // __ADDRESSSPACE_HPP__