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103 lines
2.0 KiB
103 lines
2.0 KiB
// SPDX-License-Identifier: GPL-2.0 |
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#include <byteswap.h> |
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#include <elf.h> |
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#include <endian.h> |
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#include <inttypes.h> |
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#include <stdint.h> |
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#include <stdio.h> |
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#include <stdlib.h> |
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#include <string.h> |
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#ifdef be32toh |
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/* If libc provides [bl]e{32,64}toh() then we'll use them */ |
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#elif BYTE_ORDER == LITTLE_ENDIAN |
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# define be32toh(x) bswap_32(x) |
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# define le32toh(x) (x) |
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# define be64toh(x) bswap_64(x) |
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# define le64toh(x) (x) |
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#elif BYTE_ORDER == BIG_ENDIAN |
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# define be32toh(x) (x) |
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# define le32toh(x) bswap_32(x) |
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# define be64toh(x) (x) |
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# define le64toh(x) bswap_64(x) |
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#endif |
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__attribute__((noreturn)) |
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static void die(const char *msg) |
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{ |
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fputs(msg, stderr); |
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exit(EXIT_FAILURE); |
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} |
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int main(int argc, const char *argv[]) |
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{ |
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uint64_t entry; |
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size_t nread; |
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FILE *file; |
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union { |
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Elf32_Ehdr ehdr32; |
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Elf64_Ehdr ehdr64; |
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} hdr; |
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if (argc != 2) |
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die("Usage: elf-entry <elf-file>\n"); |
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file = fopen(argv[1], "r"); |
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if (!file) { |
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perror("Unable to open input file"); |
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return EXIT_FAILURE; |
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} |
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nread = fread(&hdr, 1, sizeof(hdr), file); |
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if (nread != sizeof(hdr)) { |
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perror("Unable to read input file"); |
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fclose(file); |
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return EXIT_FAILURE; |
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} |
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if (memcmp(hdr.ehdr32.e_ident, ELFMAG, SELFMAG)) { |
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fclose(file); |
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die("Input is not an ELF\n"); |
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} |
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switch (hdr.ehdr32.e_ident[EI_CLASS]) { |
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case ELFCLASS32: |
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switch (hdr.ehdr32.e_ident[EI_DATA]) { |
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case ELFDATA2LSB: |
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entry = le32toh(hdr.ehdr32.e_entry); |
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break; |
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case ELFDATA2MSB: |
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entry = be32toh(hdr.ehdr32.e_entry); |
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break; |
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default: |
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fclose(file); |
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die("Invalid ELF encoding\n"); |
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} |
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/* Sign extend to form a canonical address */ |
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entry = (int64_t)(int32_t)entry; |
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break; |
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case ELFCLASS64: |
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switch (hdr.ehdr32.e_ident[EI_DATA]) { |
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case ELFDATA2LSB: |
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entry = le64toh(hdr.ehdr64.e_entry); |
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break; |
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case ELFDATA2MSB: |
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entry = be64toh(hdr.ehdr64.e_entry); |
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break; |
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default: |
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fclose(file); |
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die("Invalid ELF encoding\n"); |
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} |
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break; |
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default: |
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fclose(file); |
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die("Invalid ELF class\n"); |
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} |
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printf("0x%016" PRIx64 "\n", entry); |
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fclose(file); |
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return EXIT_SUCCESS; |
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}
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