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156 lines
3.9 KiB
156 lines
3.9 KiB
/*
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* Copyright (C) 2014 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef ART_LIBELFFILE_ELF_ELF_UTILS_H_
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#define ART_LIBELFFILE_ELF_ELF_UTILS_H_
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#include <elf.h>
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#include <sys/cdefs.h>
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#include <android-base/logging.h>
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namespace art {
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struct ElfTypes32 {
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typedef Elf32_Addr Addr;
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typedef Elf32_Off Off;
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typedef Elf32_Half Half;
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typedef Elf32_Word Word;
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typedef Elf32_Sword Sword;
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typedef Elf32_Ehdr Ehdr;
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typedef Elf32_Shdr Shdr;
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typedef Elf32_Sym Sym;
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typedef Elf32_Rel Rel;
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typedef Elf32_Rela Rela;
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typedef Elf32_Phdr Phdr;
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typedef Elf32_Dyn Dyn;
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};
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struct ElfTypes64 {
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typedef Elf64_Addr Addr;
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typedef Elf64_Off Off;
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typedef Elf64_Half Half;
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typedef Elf64_Word Word;
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typedef Elf64_Sword Sword;
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typedef Elf64_Xword Xword;
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typedef Elf64_Sxword Sxword;
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typedef Elf64_Ehdr Ehdr;
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typedef Elf64_Shdr Shdr;
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typedef Elf64_Sym Sym;
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typedef Elf64_Rel Rel;
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typedef Elf64_Rela Rela;
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typedef Elf64_Phdr Phdr;
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typedef Elf64_Dyn Dyn;
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};
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#define ELF_ST_BIND(x) ((x) >> 4)
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#define ELF_ST_TYPE(x) ((x) & 0xf)
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// Architecture dependent flags for the ELF header.
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#define EF_ARM_EABI_VER5 0x05000000
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#define EI_ABIVERSION 8
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#define EM_ARM 40
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#define STV_DEFAULT 0
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#define EM_AARCH64 183
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#define DT_BIND_NOW 24
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#define DT_INIT_ARRAY 25
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#define DT_FINI_ARRAY 26
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#define DT_INIT_ARRAYSZ 27
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#define DT_FINI_ARRAYSZ 28
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#define DT_RUNPATH 29
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#define DT_FLAGS 30
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// Patching section type
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#define SHT_OAT_PATCH SHT_LOUSER
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static inline void SetBindingAndType(Elf32_Sym* sym, unsigned char b, unsigned char t) {
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sym->st_info = (b << 4) + (t & 0x0f);
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}
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static inline bool IsDynamicSectionPointer(Elf32_Word d_tag,
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Elf32_Word e_machine ATTRIBUTE_UNUSED) {
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// TODO: Remove the `e_machine` parameter from API (not needed after Mips target was removed).
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switch (d_tag) {
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// case 1: well known d_tag values that imply Elf32_Dyn.d_un contains an address in d_ptr
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case DT_PLTGOT:
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case DT_HASH:
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case DT_STRTAB:
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case DT_SYMTAB:
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case DT_RELA:
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case DT_INIT:
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case DT_FINI:
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case DT_REL:
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case DT_DEBUG:
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case DT_JMPREL: {
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return true;
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}
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// d_val or ignored values
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case DT_NULL:
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case DT_NEEDED:
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case DT_PLTRELSZ:
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case DT_RELASZ:
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case DT_RELAENT:
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case DT_STRSZ:
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case DT_SYMENT:
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case DT_SONAME:
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case DT_RPATH:
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case DT_SYMBOLIC:
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case DT_RELSZ:
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case DT_RELENT:
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case DT_PLTREL:
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case DT_TEXTREL:
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case DT_BIND_NOW:
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case DT_INIT_ARRAYSZ:
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case DT_FINI_ARRAYSZ:
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case DT_RUNPATH:
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case DT_FLAGS: {
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return false;
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}
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// boundary values that should not be used
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case DT_ENCODING:
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case DT_LOOS:
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case DT_HIOS:
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case DT_LOPROC:
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case DT_HIPROC: {
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LOG(FATAL) << "Illegal d_tag value 0x" << std::hex << d_tag;
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return false;
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}
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default: {
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// case 2: "regular" DT_* ranges where even d_tag values imply an address in d_ptr
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if ((DT_ENCODING < d_tag && d_tag < DT_LOOS)
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|| (DT_LOOS < d_tag && d_tag < DT_HIOS)
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|| (DT_LOPROC < d_tag && d_tag < DT_HIPROC)) {
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if ((d_tag % 2) == 0) {
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return true;
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} else {
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return false;
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}
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} else {
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LOG(FATAL) << "Unknown d_tag value 0x" << std::hex << d_tag;
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return false;
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}
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}
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}
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}
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} // namespace art
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#endif // ART_LIBELFFILE_ELF_ELF_UTILS_H_
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