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112 lines
3.2 KiB
112 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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