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113 lines
3.2 KiB
113 lines
3.2 KiB
/*
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* Copyright (C) 2016 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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#include <elf.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <stdint.h>
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#include <stdio.h>
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#include <string.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <unistd.h>
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#include <string>
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#if !defined(EM_AARCH64)
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#define EM_AARCH64 183
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#endif
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template <typename Ehdr>
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void InitEhdr(Ehdr* ehdr, uint32_t elf_class, uint32_t machine) {
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memset(ehdr, 0, sizeof(Ehdr));
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memcpy(&ehdr->e_ident[0], ELFMAG, SELFMAG);
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ehdr->e_ident[EI_DATA] = ELFDATA2LSB;
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ehdr->e_ident[EI_VERSION] = EV_CURRENT;
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ehdr->e_ident[EI_OSABI] = ELFOSABI_SYSV;
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ehdr->e_ident[EI_CLASS] = elf_class;
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ehdr->e_type = ET_DYN;
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ehdr->e_machine = machine;
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ehdr->e_version = EV_CURRENT;
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ehdr->e_ehsize = sizeof(Ehdr);
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}
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template <typename Ehdr, typename Shdr>
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void GenElf(Ehdr* ehdr, int fd) {
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uint64_t offset = sizeof(Ehdr);
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ehdr->e_shoff = offset;
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ehdr->e_shnum = 3;
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ehdr->e_shentsize = sizeof(Shdr);
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ehdr->e_shstrndx = 2;
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TEMP_FAILURE_RETRY(write(fd, ehdr, sizeof(Ehdr)));
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Shdr shdr;
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memset(&shdr, 0, sizeof(shdr));
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shdr.sh_name = 0;
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shdr.sh_type = SHT_NULL;
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TEMP_FAILURE_RETRY(write(fd, &shdr, sizeof(Shdr)));
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offset += ehdr->e_shentsize;
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memset(&shdr, 0, sizeof(shdr));
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shdr.sh_type = SHT_PROGBITS;
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shdr.sh_name = 11;
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shdr.sh_addr = 0x5000;
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shdr.sh_offset = 0x5000;
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shdr.sh_entsize = 0x100;
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shdr.sh_size = 0x800;
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TEMP_FAILURE_RETRY(write(fd, &shdr, sizeof(Shdr)));
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offset += ehdr->e_shentsize;
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memset(&shdr, 0, sizeof(shdr));
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shdr.sh_type = SHT_STRTAB;
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shdr.sh_name = 1;
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shdr.sh_offset = 0x200;
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shdr.sh_size = 24;
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TEMP_FAILURE_RETRY(write(fd, &shdr, sizeof(Shdr)));
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// Write out the name entries information.
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lseek(fd, 0x200, SEEK_SET);
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std::string name;
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TEMP_FAILURE_RETRY(write(fd, name.data(), name.size() + 1));
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name = ".shstrtab";
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TEMP_FAILURE_RETRY(write(fd, name.data(), name.size() + 1));
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name = ".debug_frame";
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TEMP_FAILURE_RETRY(write(fd, name.data(), name.size() + 1));
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}
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int main() {
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int elf32_fd = TEMP_FAILURE_RETRY(open("elf32", O_RDWR | O_CREAT | O_TRUNC | O_CLOEXEC, 0644));
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if (elf32_fd == -1) {
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printf("Failed to create elf32: %s\n", strerror(errno));
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return 1;
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}
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int elf64_fd = TEMP_FAILURE_RETRY(open("elf64", O_RDWR | O_CREAT | O_TRUNC | O_CLOEXEC, 0644));
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if (elf64_fd == -1) {
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printf("Failed to create elf64: %s\n", strerror(errno));
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return 1;
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}
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Elf32_Ehdr ehdr32;
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InitEhdr<Elf32_Ehdr>(&ehdr32, ELFCLASS32, EM_ARM);
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GenElf<Elf32_Ehdr, Elf32_Shdr>(&ehdr32, elf32_fd);
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close(elf32_fd);
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Elf64_Ehdr ehdr64;
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InitEhdr<Elf64_Ehdr>(&ehdr64, ELFCLASS64, EM_AARCH64);
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GenElf<Elf64_Ehdr, Elf64_Shdr>(&ehdr64, elf64_fd);
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close(elf64_fd);
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}
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