text: /*
   * Copyright (C) 2014 The Android Open Source Project
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *      http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  
  #ifndef ART_RUNTIME_ELF_UTILS_H_
  #define ART_RUNTIME_ELF_UTILS_H_
  
  #include <museum/8.1.0/bionic/libc/sys/cdefs.h>
  
  // Explicitly include our own elf.h to avoid Linux and other dependencies.
  #include <museum/8.1.0/art/runtime/elf.h>
  
  #include <museum/8.1.0/art/runtime/base/logging.h>
  
  namespace facebook { namespace museum { namespace MUSEUM_VERSION { namespace art {
  
  // Architecture dependent flags for the ELF header.
  #define EF_ARM_EABI_VER5 0x05000000
  #define EF_MIPS_ABI_O32 0x00001000
  #define EF_MIPS_ARCH_32R2 0x70000000
  #define EF_MIPS_ARCH_32R6 0x90000000
  #define EF_MIPS_ARCH_64R6 0xa0000000
  
  #define EI_ABIVERSION 8
  #define EM_ARM 40
  #define EF_MIPS_NOREORDER 1
  #define EF_MIPS_PIC 2
  #define EF_MIPS_CPIC 4
  #define STV_DEFAULT 0
  
  #define EM_AARCH64 183
  
  #define DT_BIND_NOW 24
  #define DT_INIT_ARRAY 25
  #define DT_FINI_ARRAY 26
  #define DT_INIT_ARRAYSZ 27
  #define DT_FINI_ARRAYSZ 28
  #define DT_RUNPATH 29
  #define DT_FLAGS 30
  
  /* MIPS dependent d_tag field for Elf32_Dyn.  */
  #define DT_MIPS_RLD_VERSION  0x70000001 /* Runtime Linker Interface ID */
  #define DT_MIPS_TIME_STAMP   0x70000002 /* Timestamp */
  #define DT_MIPS_ICHECKSUM    0x70000003 /* Cksum of ext. str. and com. sizes */
  #define DT_MIPS_IVERSION     0x70000004 /* Version string (string tbl index) */
  #define DT_MIPS_FLAGS        0x70000005 /* Flags */
  #define DT_MIPS_BASE_ADDRESS 0x70000006 /* Segment base address */
  #define DT_MIPS_CONFLICT     0x70000008 /* Adr of .conflict section */
  #define DT_MIPS_LIBLIST      0x70000009 /* Address of .liblist section */
  #define DT_MIPS_LOCAL_GOTNO  0x7000000a /* Number of local .GOT entries */
  #define DT_MIPS_CONFLICTNO   0x7000000b /* Number of .conflict entries */
  #define DT_MIPS_LIBLISTNO    0x70000010 /* Number of .liblist entries */
  #define DT_MIPS_SYMTABNO     0x70000011 /* Number of .dynsym entries */
  #define DT_MIPS_UNREFEXTNO   0x70000012 /* First external DYNSYM */
  #define DT_MIPS_GOTSYM       0x70000013 /* First GOT entry in .dynsym */
  #define DT_MIPS_HIPAGENO     0x70000014 /* Number of GOT page table entries */
  #define DT_MIPS_RLD_MAP      0x70000016 /* Address of debug map pointer */
  
  // Patching section type
  #define SHT_OAT_PATCH        SHT_LOUSER
  
  static inline void SetBindingAndType(Elf32_Sym* sym, unsigned char b, unsigned char t) {
    sym->st_info = (b << 4) + (t & 0x0f);
  }
  
  static inline bool IsDynamicSectionPointer(Elf32_Word d_tag, Elf32_Word e_machine) {
    switch (d_tag) {
      // case 1: well known d_tag values that imply Elf32_Dyn.d_un contains an address in d_ptr
      case DT_PLTGOT:
      case DT_HASH:
      case DT_STRTAB:
      case DT_SYMTAB:
      case DT_RELA:
      case DT_INIT:
      case DT_FINI:
      case DT_REL:
      case DT_DEBUG:
      case DT_JMPREL: {
        return true;
      }
      // d_val or ignored values
      case DT_NULL:
      case DT_NEEDED:
      case DT_PLTRELSZ:
      case DT_RELASZ:
      case DT_RELAENT:
      case DT_STRSZ:
      case DT_SYMENT:
      case DT_SONAME:
      case DT_RPATH:
      case DT_SYMBOLIC:
      case DT_RELSZ:
      case DT_RELENT:
      case DT_PLTREL:
      case DT_TEXTREL:
      case DT_BIND_NOW:
      case DT_INIT_ARRAYSZ:
      case DT_FINI_ARRAYSZ:
      case DT_RUNPATH:
      case DT_FLAGS: {
        return false;
      }
      // boundary values that should not be used
      case DT_ENCODING:
      case DT_LOOS:
      case DT_HIOS:
      case DT_LOPROC:
      case DT_HIPROC: {
        LOG(FATAL) << "Illegal d_tag value 0x" << std::hex << d_tag;
        return false;
      }
      default: {
        // case 2: "regular" DT_* ranges where even d_tag values imply an address in d_ptr
        if ((DT_ENCODING  < d_tag && d_tag < DT_LOOS)
            || (DT_LOOS   < d_tag && d_tag < DT_HIOS)
            || (DT_LOPROC < d_tag && d_tag < DT_HIPROC)) {
          // Special case for MIPS which breaks the regular rules between DT_LOPROC and DT_HIPROC
          if (e_machine == EM_MIPS) {
            switch (d_tag) {
              case DT_MIPS_RLD_VERSION:
              case DT_MIPS_TIME_STAMP:
              case DT_MIPS_ICHECKSUM:
              case DT_MIPS_IVERSION:
              case DT_MIPS_FLAGS:
              case DT_MIPS_LOCAL_GOTNO:
              case DT_MIPS_CONFLICTNO:
              case DT_MIPS_LIBLISTNO:
              case DT_MIPS_SYMTABNO:
              case DT_MIPS_UNREFEXTNO:
              case DT_MIPS_GOTSYM:
              case DT_MIPS_HIPAGENO: {
                return false;
              }
              case DT_MIPS_BASE_ADDRESS:
              case DT_MIPS_CONFLICT:
              case DT_MIPS_LIBLIST:
              case DT_MIPS_RLD_MAP: {
                return true;
              }
              default: {
                LOG(FATAL) << "Unknown MIPS d_tag value 0x" << std::hex << d_tag;
                return false;
              }
            }
          } else if ((d_tag % 2) == 0) {
            return true;
          } else {
            return false;
          }
        } else {
          LOG(FATAL) << "Unknown d_tag value 0x" << std::hex << d_tag;
          return false;
        }
      }
    }
  }
  
  } } } } // namespace facebook::museum::MUSEUM_VERSION::art
  
  #endif  // ART_RUNTIME_ELF_UTILS_H_
  