284 lines
6.1 KiB
C
284 lines
6.1 KiB
C
/*
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* arch/alpha/boot/tools/objstrip.c
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*
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* Strip the object file headers/trailers from an executable (ELF or ECOFF).
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*
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* Copyright (C) 1996 David Mosberger-Tang.
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*/
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/*
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* Converts an ECOFF or ELF object file into a bootable file. The
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* object file must be a OMAGIC file (i.e., data and bss follow immediately
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* behind the text). See DEC "Assembly Language Programmer's Guide"
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* documentation for details. The SRM boot process is documented in
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* the Alpha AXP Architecture Reference Manual, Second Edition by
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* Richard L. Sites and Richard T. Witek.
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*/
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#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <sys/fcntl.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <linux/a.out.h>
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#include <linux/coff.h>
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#include <linux/param.h>
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#ifdef __ELF__
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# include <linux/elf.h>
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# define elfhdr elf64_hdr
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# define elf_phdr elf64_phdr
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# define elf_check_arch(x) ((x)->e_machine == EM_ALPHA)
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#endif
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/* bootfile size must be multiple of BLOCK_SIZE: */
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#define BLOCK_SIZE 512
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const char * prog_name;
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static void
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usage (void)
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{
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fprintf(stderr,
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"usage: %s [-v] -p file primary\n"
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" %s [-vb] file [secondary]\n", prog_name, prog_name);
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exit(1);
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}
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int
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main (int argc, char *argv[])
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{
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size_t nwritten, tocopy, n, mem_size, fil_size, pad = 0;
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int fd, ofd, i, j, verbose = 0, primary = 0;
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char buf[8192], *inname;
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struct exec * aout; /* includes file & aout header */
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long offset;
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#ifdef __ELF__
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struct elfhdr *elf;
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struct elf_phdr *elf_phdr; /* program header */
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unsigned long long e_entry;
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#endif
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prog_name = argv[0];
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for (i = 1; i < argc && argv[i][0] == '-'; ++i) {
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for (j = 1; argv[i][j]; ++j) {
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switch (argv[i][j]) {
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case 'v':
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verbose = ~verbose;
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break;
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case 'b':
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pad = BLOCK_SIZE;
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break;
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case 'p':
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primary = 1; /* make primary bootblock */
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break;
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}
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}
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}
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if (i >= argc) {
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usage();
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}
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inname = argv[i++];
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fd = open(inname, O_RDONLY);
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if (fd == -1) {
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perror("open");
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exit(1);
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}
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ofd = 1;
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if (i < argc) {
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ofd = open(argv[i++], O_WRONLY | O_CREAT | O_TRUNC, 0666);
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if (ofd == -1) {
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perror("open");
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exit(1);
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}
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}
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if (primary) {
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/* generate bootblock for primary loader */
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unsigned long bb[64], sum = 0;
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struct stat st;
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off_t size;
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int i;
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if (ofd == 1) {
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usage();
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}
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if (fstat(fd, &st) == -1) {
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perror("fstat");
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exit(1);
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}
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size = (st.st_size + BLOCK_SIZE - 1) & ~(BLOCK_SIZE - 1);
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memset(bb, 0, sizeof(bb));
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strcpy((char *) bb, "Linux SRM bootblock");
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bb[60] = size / BLOCK_SIZE; /* count */
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bb[61] = 1; /* starting sector # */
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bb[62] = 0; /* flags---must be 0 */
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for (i = 0; i < 63; ++i) {
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sum += bb[i];
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}
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bb[63] = sum;
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if (write(ofd, bb, sizeof(bb)) != sizeof(bb)) {
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perror("boot-block write");
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exit(1);
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}
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printf("%lu\n", size);
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return 0;
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}
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/* read and inspect exec header: */
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if (read(fd, buf, sizeof(buf)) < 0) {
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perror("read");
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exit(1);
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}
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#ifdef __ELF__
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elf = (struct elfhdr *) buf;
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if (elf->e_ident[0] == 0x7f && strncmp((char *)elf->e_ident + 1, "ELF", 3) == 0) {
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if (elf->e_type != ET_EXEC) {
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fprintf(stderr, "%s: %s is not an ELF executable\n",
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prog_name, inname);
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exit(1);
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}
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if (!elf_check_arch(elf)) {
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fprintf(stderr, "%s: is not for this processor (e_machine=%d)\n",
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prog_name, elf->e_machine);
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exit(1);
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}
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if (elf->e_phnum != 1) {
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fprintf(stderr,
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"%s: %d program headers (forgot to link with -N?)\n",
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prog_name, elf->e_phnum);
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}
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e_entry = elf->e_entry;
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lseek(fd, elf->e_phoff, SEEK_SET);
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if (read(fd, buf, sizeof(*elf_phdr)) != sizeof(*elf_phdr)) {
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perror("read");
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exit(1);
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}
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elf_phdr = (struct elf_phdr *) buf;
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offset = elf_phdr->p_offset;
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mem_size = elf_phdr->p_memsz;
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fil_size = elf_phdr->p_filesz;
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/* work around ELF bug: */
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if (elf_phdr->p_vaddr < e_entry) {
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unsigned long delta = e_entry - elf_phdr->p_vaddr;
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offset += delta;
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mem_size -= delta;
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fil_size -= delta;
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elf_phdr->p_vaddr += delta;
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}
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if (verbose) {
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fprintf(stderr, "%s: extracting %#016lx-%#016lx (at %lx)\n",
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prog_name, (long) elf_phdr->p_vaddr,
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elf_phdr->p_vaddr + fil_size, offset);
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}
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} else
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#endif
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{
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aout = (struct exec *) buf;
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if (!(aout->fh.f_flags & COFF_F_EXEC)) {
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fprintf(stderr, "%s: %s is not in executable format\n",
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prog_name, inname);
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exit(1);
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}
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if (aout->fh.f_opthdr != sizeof(aout->ah)) {
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fprintf(stderr, "%s: %s has unexpected optional header size\n",
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prog_name, inname);
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exit(1);
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}
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if (N_MAGIC(*aout) != OMAGIC) {
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fprintf(stderr, "%s: %s is not an OMAGIC file\n",
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prog_name, inname);
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exit(1);
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}
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offset = N_TXTOFF(*aout);
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fil_size = aout->ah.tsize + aout->ah.dsize;
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mem_size = fil_size + aout->ah.bsize;
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if (verbose) {
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fprintf(stderr, "%s: extracting %#016lx-%#016lx (at %lx)\n",
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prog_name, aout->ah.text_start,
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aout->ah.text_start + fil_size, offset);
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}
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}
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if (lseek(fd, offset, SEEK_SET) != offset) {
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perror("lseek");
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exit(1);
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}
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if (verbose) {
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fprintf(stderr, "%s: copying %lu byte from %s\n",
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prog_name, (unsigned long) fil_size, inname);
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}
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tocopy = fil_size;
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while (tocopy > 0) {
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n = tocopy;
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if (n > sizeof(buf)) {
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n = sizeof(buf);
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}
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tocopy -= n;
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if ((size_t) read(fd, buf, n) != n) {
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perror("read");
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exit(1);
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}
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do {
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nwritten = write(ofd, buf, n);
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if ((ssize_t) nwritten == -1) {
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perror("write");
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exit(1);
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}
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n -= nwritten;
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} while (n > 0);
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}
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if (pad) {
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mem_size = ((mem_size + pad - 1) / pad) * pad;
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}
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tocopy = mem_size - fil_size;
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if (tocopy > 0) {
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fprintf(stderr,
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"%s: zero-filling bss and aligning to %lu with %lu bytes\n",
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prog_name, pad, (unsigned long) tocopy);
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memset(buf, 0x00, sizeof(buf));
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do {
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n = tocopy;
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if (n > sizeof(buf)) {
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n = sizeof(buf);
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}
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nwritten = write(ofd, buf, n);
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if ((ssize_t) nwritten == -1) {
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perror("write");
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exit(1);
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}
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tocopy -= nwritten;
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} while (tocopy > 0);
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}
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return 0;
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}
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