2 * arch/alpha/boot/tools/objstrip.c
4 * Strip the object file headers/trailers from an executable (ELF or ECOFF).
6 * Copyright (C) 1996 David Mosberger-Tang.
9 * Converts an ECOFF or ELF object file into a bootable file. The
10 * object file must be a OMAGIC file (i.e., data and bss follow immediately
11 * behind the text). See DEC "Assembly Language Programmer's Guide"
12 * documentation for details. The SRM boot process is documented in
13 * the Alpha AXP Architecture Reference Manual, Second Edition by
14 * Richard L. Sites and Richard T. Witek.
21 #include <sys/fcntl.h>
23 #include <sys/types.h>
25 #include <linux/a.out.h>
26 #include <linux/coff.h>
27 #include <linux/param.h>
28 #include <linux/string.h>
30 # include <linux/elf.h>
33 /* bootfile size must be multiple of BLOCK_SIZE: */
34 #define BLOCK_SIZE 512
36 const char * prog_name;
43 "usage: %s [-v] -p file primary\n"
44 " %s [-vb] file [secondary]\n", prog_name, prog_name);
50 main (int argc, char *argv[])
52 size_t nwritten, tocopy, n, mem_size, fil_size, pad = 0;
53 int fd, ofd, i, j, verbose = 0, primary = 0;
54 char buf[8192], *inname;
55 struct exec * aout; /* includes file & aout header */
59 struct elf_phdr *elf_phdr; /* program header */
60 unsigned long long e_entry;
65 for (i = 1; i < argc && argv[i][0] == '-'; ++i) {
66 for (j = 1; argv[i][j]; ++j) {
77 primary = 1; /* make primary bootblock */
88 fd = open(inname, O_RDONLY);
96 ofd = open(argv[i++], O_WRONLY | O_CREAT | O_TRUNC, 0666);
104 /* generate bootblock for primary loader */
106 unsigned long bb[64], sum = 0;
115 if (fstat(fd, &st) == -1) {
120 size = (st.st_size + BLOCK_SIZE - 1) & ~(BLOCK_SIZE - 1);
121 memset(bb, 0, sizeof(bb));
122 strcpy((char *) bb, "Linux SRM bootblock");
123 bb[60] = size / BLOCK_SIZE; /* count */
124 bb[61] = 1; /* starting sector # */
125 bb[62] = 0; /* flags---must be 0 */
126 for (i = 0; i < 63; ++i) {
130 if (write(ofd, bb, sizeof(bb)) != sizeof(bb)) {
131 perror("boot-block write");
134 printf("%lu\n", size);
138 /* read and inspect exec header: */
140 if (read(fd, buf, sizeof(buf)) < 0) {
146 elf = (struct elfhdr *) buf;
148 if (elf->e_ident[0] == 0x7f && strncmp(elf->e_ident + 1, "ELF", 3) == 0) {
149 if (elf->e_type != ET_EXEC) {
150 fprintf(stderr, "%s: %s is not an ELF executable\n",
154 if (!elf_check_arch(elf)) {
155 fprintf(stderr, "%s: is not for this processor (e_machine=%d)\n",
156 prog_name, elf->e_machine);
159 if (elf->e_phnum != 1) {
161 "%s: %d program headers (forgot to link with -N?)\n",
162 prog_name, elf->e_phnum);
165 e_entry = elf->e_entry;
167 lseek(fd, elf->e_phoff, SEEK_SET);
168 if (read(fd, buf, sizeof(*elf_phdr)) != sizeof(*elf_phdr)) {
173 elf_phdr = (struct elf_phdr *) buf;
174 offset = elf_phdr->p_offset;
175 mem_size = elf_phdr->p_memsz;
176 fil_size = elf_phdr->p_filesz;
178 /* work around ELF bug: */
179 if (elf_phdr->p_vaddr < e_entry) {
180 unsigned long delta = e_entry - elf_phdr->p_vaddr;
184 elf_phdr->p_vaddr += delta;
188 fprintf(stderr, "%s: extracting %#016lx-%#016lx (at %lx)\n",
189 prog_name, (long) elf_phdr->p_vaddr,
190 elf_phdr->p_vaddr + fil_size, offset);
195 aout = (struct exec *) buf;
197 if (!(aout->fh.f_flags & COFF_F_EXEC)) {
198 fprintf(stderr, "%s: %s is not in executable format\n",
203 if (aout->fh.f_opthdr != sizeof(aout->ah)) {
204 fprintf(stderr, "%s: %s has unexpected optional header size\n",
209 if (N_MAGIC(*aout) != OMAGIC) {
210 fprintf(stderr, "%s: %s is not an OMAGIC file\n",
214 offset = N_TXTOFF(*aout);
215 fil_size = aout->ah.tsize + aout->ah.dsize;
216 mem_size = fil_size + aout->ah.bsize;
219 fprintf(stderr, "%s: extracting %#016lx-%#016lx (at %lx)\n",
220 prog_name, aout->ah.text_start,
221 aout->ah.text_start + fil_size, offset);
225 if (lseek(fd, offset, SEEK_SET) != offset) {
231 fprintf(stderr, "%s: copying %lu byte from %s\n",
232 prog_name, (unsigned long) fil_size, inname);
238 if (n > sizeof(buf)) {
242 if ((size_t) read(fd, buf, n) != n) {
247 nwritten = write(ofd, buf, n);
248 if ((ssize_t) nwritten == -1) {
257 mem_size = ((mem_size + pad - 1) / pad) * pad;
260 tocopy = mem_size - fil_size;
263 "%s: zero-filling bss and aligning to %lu with %lu bytes\n",
264 prog_name, pad, (unsigned long) tocopy);
266 memset(buf, 0x00, sizeof(buf));
269 if (n > sizeof(buf)) {
272 nwritten = write(ofd, buf, n);
273 if ((ssize_t) nwritten == -1) {
278 } while (tocopy > 0);