160 lines
4.2 KiB
C
160 lines
4.2 KiB
C
/*-
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* Copyright (c) 2002 Jake Burkholder
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/types.h>
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#include <sys/elf64.h>
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#include <sys/endian.h>
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#include <sys/mman.h>
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#include <sys/stat.h>
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#include <err.h>
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#include <fcntl.h>
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#include <string.h>
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#include <unistd.h>
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#define xe16toh(x) ((data == ELFDATA2MSB) ? be16toh(x) : le16toh(x))
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#define xe32toh(x) ((data == ELFDATA2MSB) ? be32toh(x) : le32toh(x))
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#define xe64toh(x) ((data == ELFDATA2MSB) ? be64toh(x) : le64toh(x))
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#define htoxe32(x) ((data == ELFDATA2MSB) ? htobe32(x) : htole32(x))
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struct exec {
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u_int32_t a_magic;
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u_int32_t a_text;
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u_int32_t a_data;
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u_int32_t a_bss;
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u_int32_t a_syms;
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u_int32_t a_entry;
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u_int32_t a_trsize;
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u_int32_t a_drsize;
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};
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#define A_MAGIC 0x01030107
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static void usage(void);
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/*
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* elf to a.out converter for freebsd/sparc64 bootblocks.
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*/
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int
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main(int ac, char **av)
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{
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Elf64_Half phentsize;
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Elf64_Half machine;
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Elf64_Half phnum;
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Elf64_Xword filesz;
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Elf64_Xword memsz;
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Elf64_Addr entry;
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Elf64_Off offset;
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Elf64_Off phoff;
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Elf64_Word type;
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unsigned char data;
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struct stat sb;
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struct exec a;
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Elf64_Phdr *p;
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Elf64_Ehdr *e;
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void *v;
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int efd;
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int fd;
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int c;
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int i;
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fd = STDIN_FILENO;
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while ((c = getopt(ac, av, "o:")) != -1)
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switch (c) {
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case 'o':
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if ((fd = open(optarg, O_CREAT|O_RDWR, 0644)) < 0)
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err(1, "%s", optarg);
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break;
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case '?':
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default:
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usage();
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}
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ac -= optind;
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av += optind;
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if (ac == 0)
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usage();
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if ((efd = open(*av, O_RDONLY)) < 0 || fstat(efd, &sb) < 0)
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err(1, NULL);
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v = mmap(NULL, sb.st_size, PROT_READ, MAP_SHARED, efd, 0);
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if ((e = v) == MAP_FAILED)
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err(1, NULL);
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if (!IS_ELF(*e))
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errx(1, "not an elf file");
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if (e->e_ident[EI_CLASS] != ELFCLASS64)
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errx(1, "wrong class");
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data = e->e_ident[EI_DATA];
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if (data != ELFDATA2MSB && data != ELFDATA2LSB)
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errx(1, "wrong data format");
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if (e->e_ident[EI_VERSION] != EV_CURRENT)
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errx(1, "wrong elf version");
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machine = xe16toh(e->e_machine);
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if (machine != EM_SPARCV9 && machine != EM_ALPHA)
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errx(1, "wrong machine type");
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phentsize = xe16toh(e->e_phentsize);
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if (phentsize != sizeof(*p))
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errx(1, "phdr size mismatch");
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entry = xe64toh(e->e_entry);
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phoff = xe64toh(e->e_phoff);
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phnum = xe16toh(e->e_phnum);
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p = (Elf64_Phdr *)((char *)e + phoff);
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bzero(&a, sizeof(a));
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for (i = 0; i < phnum; i++) {
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type = xe32toh(p[i].p_type);
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switch (type) {
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case PT_LOAD:
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if (a.a_magic != 0)
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errx(1, "too many loadable segments");
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filesz = xe64toh(p[i].p_filesz);
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memsz = xe64toh(p[i].p_memsz);
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offset = xe64toh(p[i].p_offset);
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a.a_magic = htoxe32(A_MAGIC);
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a.a_text = htoxe32(filesz);
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a.a_bss = htoxe32(memsz - filesz);
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a.a_entry = htoxe32(entry);
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if (write(fd, &a, sizeof(a)) != sizeof(a) ||
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write(fd, (char *)e + offset, filesz) != (ssize_t)filesz)
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err(1, NULL);
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break;
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default:
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break;
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}
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}
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return (0);
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}
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static void
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usage(void)
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{
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errx(1, "usage: elf2aout [-o outfile] infile");
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}
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