Port Android relocation packer to chromium build

third_party/android_platform/relocation_packer/src/elf_traits.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // Target-specific ELF type traits.
 
 #ifndef TOOLS_RELOCATION_PACKER_SRC_ELF_TRAITS_H_
 #define TOOLS_RELOCATION_PACKER_SRC_ELF_TRAITS_H_
 
 #include "elf.h"
 #include "libelf.h"
 
-// The TARGET_ macro controls which Elf types we expect and handle.
-// Either TARGET_ARM or TARGET_ARM64 must be defined, but not both.
+// ELF is a traits structure used to provide convenient aliases for
+// 32/64 bit Elf types and functions, depending on the target file.
 
-#if !defined(TARGET_ARM) && !defined(TARGET_ARM64)
-# error "Unsupported target, define one of TARGET_ARM or TARGET_ARM64"
-#elif defined(TARGET_ARM) && defined(TARGET_ARM64)
-# error "Define one of TARGET_ARM or TARGET_ARM64, but not both"
-#endif
-
-// TODO(simonb): Eliminate these once AARCH64 appears reliably in elf.h.
-#ifndef EM_AARCH64
-#define EM_AARCH64 183
-#endif
-#ifndef R_AARCH64_RELATIVE
-#define R_AARCH64_RELATIVE 1027
-#endif
-#ifndef R_AARCH64_NONE
-#define R_AARCH64_NONE 0
-#endif
-
-// ELF is a traits structure used to provide convenient aliases for
-// 32/64 bit Elf types and functions, depending on the target specified.
-
-#if defined(TARGET_ARM)
-struct ELF {
+struct ELF32_traits {
   typedef Elf32_Addr Addr;
   typedef Elf32_Dyn Dyn;
   typedef Elf32_Ehdr Ehdr;
   typedef Elf32_Off Off;
   typedef Elf32_Phdr Phdr;
   typedef Elf32_Rel Rel;
   typedef Elf32_Rela Rela;
   typedef Elf32_Shdr Shdr;
   typedef Elf32_Sword Sword;
   typedef Elf32_Sxword Sxword;
   typedef Elf32_Sym Sym;
   typedef Elf32_Word Word;
   typedef Elf32_Xword Xword;
+  typedef Elf32_Half Half;
 
   static inline Ehdr* getehdr(Elf* elf) { return elf32_getehdr(elf); }
   static inline Phdr* getphdr(Elf* elf) { return elf32_getphdr(elf); }
   static inline Shdr* getshdr(Elf_Scn* scn) { return elf32_getshdr(scn); }
-
-  enum { kMachine = EM_ARM };
-  enum { kFileClass = ELFCLASS32 };
-  enum { kRelativeRelocationCode = R_ARM_RELATIVE };
-  enum { kNoRelocationCode = R_ARM_NONE };
-
-  static inline const char* Machine() { return "ARM"; }
-
-# define ELF_R_SYM(val) ELF32_R_SYM(val)
-# define ELF_R_TYPE(val) ELF32_R_TYPE(val)
-# define ELF_R_INFO(sym, type) ELF32_R_INFO(sym, type)
-# define ELF_ST_TYPE(val) ELF32_ST_TYPE(val)
+  static inline Word elf_r_type(Word info) { return ELF32_R_TYPE(info); }
+  static inline int elf_st_type(uint8_t info) { return ELF32_ST_TYPE(info); }
+  static inline Word elf_r_sym(Word info) { return ELF32_R_SYM(info); }
 };
 
-#elif defined(TARGET_ARM64)
-struct ELF {
+struct ELF64_traits {
   typedef Elf64_Addr Addr;
   typedef Elf64_Dyn Dyn;
   typedef Elf64_Ehdr Ehdr;
   typedef Elf64_Off Off;
   typedef Elf64_Phdr Phdr;
   typedef Elf64_Rel Rel;
   typedef Elf64_Rela Rela;
   typedef Elf64_Shdr Shdr;
   typedef Elf64_Sword Sword;
   typedef Elf64_Sxword Sxword;
   typedef Elf64_Sym Sym;
   typedef Elf64_Word Word;
   typedef Elf64_Xword Xword;
+  typedef Elf64_Half Half;
 
   static inline Ehdr* getehdr(Elf* elf) { return elf64_getehdr(elf); }
   static inline Phdr* getphdr(Elf* elf) { return elf64_getphdr(elf); }
   static inline Shdr* getshdr(Elf_Scn* scn) { return elf64_getshdr(scn); }
-
-  enum { kMachine = EM_AARCH64 };
-  enum { kFileClass = ELFCLASS64 };
-  enum { kRelativeRelocationCode = R_AARCH64_RELATIVE };
-  enum { kNoRelocationCode = R_AARCH64_NONE };
-
-  static inline const char* Machine() { return "ARM64"; }
-
-# define ELF_R_SYM(val) ELF64_R_SYM(val)
-# define ELF_R_TYPE(val) ELF64_R_TYPE(val)
-# define ELF_R_INFO(sym, type) ELF64_R_INFO(sym, type)
-# define ELF_ST_TYPE(val) ELF64_ST_TYPE(val)
+  static inline Xword elf_r_type(Xword info) { return ELF64_R_TYPE(info); }
+  static inline int elf_st_type(uint8_t info) { return ELF64_ST_TYPE(info); }
+  static inline Word elf_r_sym(Xword info) { return ELF64_R_SYM(info); }
 };
-#endif
 
 #endif  // TOOLS_RELOCATION_PACKER_SRC_ELF_TRAITS_H_