1/*- 2 * Copyright (c) 2002 Jake Burkholder 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 */ 26 27#include <sys/cdefs.h> 28__FBSDID("$FreeBSD$"); 29 30#include <sys/types.h> 31#include <sys/elf64.h> 32#include <sys/endian.h> 33#include <sys/mman.h> 34#include <sys/stat.h> 35 36#include <err.h> 37#include <fcntl.h> 38#include <stdio.h> 39#include <stdlib.h> 40#include <string.h> 41#include <unistd.h> 42 43#define xe16toh(x) ((data == ELFDATA2MSB) ? be16toh(x) : le16toh(x)) 44#define xe32toh(x) ((data == ELFDATA2MSB) ? be32toh(x) : le32toh(x)) 45#define xe64toh(x) ((data == ELFDATA2MSB) ? be64toh(x) : le64toh(x)) 46#define htoxe32(x) ((data == ELFDATA2MSB) ? htobe32(x) : htole32(x)) 47 48struct exec { 49 u_int32_t a_magic; 50 u_int32_t a_text; 51 u_int32_t a_data; 52 u_int32_t a_bss; 53 u_int32_t a_syms; 54 u_int32_t a_entry; 55 u_int32_t a_trsize; 56 u_int32_t a_drsize; 57}; 58#define A_MAGIC 0x01030107 59 60static void usage(void); 61 62/* 63 * elf to a.out converter for freebsd/sparc64 bootblocks. 64 */ 65int 66main(int ac, char **av) 67{ 68 Elf64_Half phentsize; 69 Elf64_Half machine; 70 Elf64_Half phnum; 71 Elf64_Xword filesz; 72 Elf64_Xword memsz; 73 Elf64_Addr entry; 74 Elf64_Off offset; 75 Elf64_Off phoff; 76 Elf64_Word type; 77 unsigned char data; 78 struct stat sb; 79 struct exec a; 80 Elf64_Phdr *p; 81 Elf64_Ehdr *e; 82 void *v; 83 int efd; 84 int fd; 85 int c; 86 int i; 87 88 fd = STDIN_FILENO; 89 while ((c = getopt(ac, av, "o:")) != -1) 90 switch (c) { 91 case 'o': 92 if ((fd = open(optarg, O_CREAT|O_RDWR, 0644)) < 0) 93 err(1, "%s", optarg); 94 break; 95 case '?': 96 default: 97 usage(); 98 } 99 ac -= optind; 100 av += optind; 101 if (ac == 0) 102 usage(); 103 104 if ((efd = open(*av, O_RDONLY)) < 0 || fstat(efd, &sb) < 0) 105 err(1, NULL); 106 v = mmap(NULL, sb.st_size, PROT_READ, MAP_SHARED, efd, 0); 107 if ((e = v) == MAP_FAILED) 108 err(1, NULL); 109 110 if (!IS_ELF(*e)) 111 errx(1, "not an elf file"); 112 if (e->e_ident[EI_CLASS] != ELFCLASS64) 113 errx(1, "wrong class"); 114 data = e->e_ident[EI_DATA]; 115 if (data != ELFDATA2MSB && data != ELFDATA2LSB) 116 errx(1, "wrong data format"); 117 if (e->e_ident[EI_VERSION] != EV_CURRENT) 118 errx(1, "wrong elf version"); 119 machine = xe16toh(e->e_machine); 120 if (machine != EM_SPARCV9 && machine != EM_ALPHA) 121 errx(1, "wrong machine type"); 122 phentsize = xe16toh(e->e_phentsize); 123 if (phentsize != sizeof(*p)) 124 errx(1, "phdr size mismatch"); 125 126 entry = xe64toh(e->e_entry); 127 phoff = xe64toh(e->e_phoff); 128 phnum = xe16toh(e->e_phnum); 129 p = (Elf64_Phdr *)((char *)e + phoff); 130 bzero(&a, sizeof(a)); 131 for (i = 0; i < phnum; i++) { 132 type = xe32toh(p[i].p_type); 133 switch (type) { 134 case PT_LOAD: 135 if (a.a_magic != 0) 136 errx(1, "too many loadable segments"); 137 filesz = xe64toh(p[i].p_filesz); 138 memsz = xe64toh(p[i].p_memsz); 139 offset = xe64toh(p[i].p_offset); 140 a.a_magic = htoxe32(A_MAGIC); 141 a.a_text = htoxe32(filesz); 142 a.a_bss = htoxe32(memsz - filesz); 143 a.a_entry = htoxe32(entry); 144 if (write(fd, &a, sizeof(a)) != sizeof(a) || 145 write(fd, (char *)e + offset, filesz) != (ssize_t)filesz) 146 err(1, NULL); 147 break; 148 default: 149 break; 150 } 151 } 152 153 return (0); 154} 155 156static void 157usage(void) 158{ 159 160 fprintf(stderr, "usage: elf2aout [-o outfile] infile\n"); 161 exit(1); 162} 163