335 lines
6.7 KiB
C
335 lines
6.7 KiB
C
/*
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* ----------------------------------------------------------------------------
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* "THE BEER-WARE LICENSE" (Revision 42):
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* <phk@login.dknet.dk> wrote this file. As long as you retain this notice you
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* can do whatever you want with this stuff. If we meet some day, and you think
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* this stuff is worth it, you can buy me a beer in return. Poul-Henning Kamp
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* ----------------------------------------------------------------------------
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*
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* Copyright (C) 1993 Hannu Savolainen
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* Ported to 386bsd by Serge Vakulenko
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* based on tools/build.c by Linus Torvalds
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*/
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#ifndef lint
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static const char rcsid[] =
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"$Id: kzip.c,v 1.10 1997/07/18 06:40:46 charnier Exp $";
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#endif /* not lint */
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#include <err.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <sys/file.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <sys/param.h>
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#include <sys/wait.h>
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#include <a.out.h>
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#include <string.h>
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#define MAXIMAGE (2*1024*1024)
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/* This is the limit because a kzip'ed kernel loads at 3Mb and
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* ends up at 1Mb
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*/
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static void
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usage()
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{
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fprintf(stderr, "usage: kzip [-v] [ -l loadaddr] kernel\n");
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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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pid_t Pext, Pgzip, Ppiggy, Pld;
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int pipe1[2], pipe2[2];
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int status, fdi, fdo, fdn, c, verbose;
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int size;
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struct exec hdr;
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int zip_size, offset;
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struct stat st;
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u_long forceaddr = 0, entry;
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char *kernname;
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char obj[BUFSIZ];
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char out[BUFSIZ];
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char base[32];
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while ((c = getopt(argc, argv, "l:v")) != -1) {
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switch (c) {
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case 'l':
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forceaddr = strtoul(optarg, NULL, 0);
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if (forceaddr == 0)
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errx(1, "invalid load address");
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break;
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case 'v':
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verbose++;
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break;
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default:
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usage();
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}
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}
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if ((argc - optind) != 1)
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usage();
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argc -= optind;
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argv += optind;
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kernname = argv[0];
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strcpy(obj, kernname); strcat(obj,".o");
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strcpy(out, kernname); strcat(out,".kz");
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fdi = open(kernname ,O_RDONLY);
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if(fdi<0) {
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warn(kernname);
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return 2;
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}
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/* figure out how big the uncompressed image will be */
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if (read (fdi, (char *)&hdr, sizeof(hdr)) != sizeof(hdr))
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err(2, argv[1]);
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size = hdr.a_text + hdr.a_data + hdr.a_bss;
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entry = hdr.a_entry & 0x00FFFFFF;
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lseek (fdi, 0, SEEK_SET);
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if (verbose) {
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printf("real kernel start address will be: 0x%x\n", entry);
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printf("real kernel end address will be: 0x%x\n", entry+size);
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}
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fdo = open(obj,O_WRONLY|O_TRUNC|O_CREAT,0666);
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if(fdo<0) {
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warn(obj);
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return 2;
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}
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if (pipe(pipe1) < 0) { perror("pipe()"); return 1; }
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if (pipe(pipe2) < 0) { perror("pipe()"); return 1; }
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Pext = fork();
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if (Pext < 0) { perror("fork()"); return 1; }
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if (!Pext) {
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dup2(fdi,0);
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dup2(pipe1[1],1);
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close(pipe1[0]); close(pipe1[1]);
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close(pipe2[0]); close(pipe2[1]);
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close(fdi); close(fdo);
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extract(kernname);
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exit(0);
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}
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Pgzip = fork();
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if (Pgzip < 0) { perror("fork()"); return 1; }
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if (!Pgzip) {
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dup2(pipe1[0],0);
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dup2(pipe2[1],1);
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close(pipe1[0]); close(pipe1[1]);
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close(pipe2[0]); close(pipe2[1]);
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close(fdi); close(fdo);
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execlp("gzip", "gzip", "-9", "-n", 0);
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exit (0);
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}
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Ppiggy = fork();
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if (Ppiggy < 0) { warn("fork()"); return 1; }
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if (!Ppiggy) {
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dup2(pipe2[0],0);
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dup2(fdo,1);
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close(pipe1[0]); close(pipe1[1]);
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close(pipe2[0]); close(pipe2[1]);
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close(fdi); close(fdo);
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piggyback(obj);
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exit(0);
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}
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close(pipe1[0]); close(pipe1[1]);
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close(pipe2[0]); close(pipe2[1]);
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close(fdi); close(fdo);
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if (waitpid(Pext, &status,0) < 0)
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{ warn("waitpid(Pextract)"); return 1; }
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if(status) {
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warnx("extract returned %x",status);
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return 3;
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}
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if (waitpid(Pgzip, &status,0) < 0)
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{ perror("waitpid(Pgzip)"); return 1; }
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if(status) {
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warnx("gzip returned %x",status);
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return 3;
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}
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if (waitpid(Ppiggy, &status,0) < 0)
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{ warn("waitpid(Ppiggy)"); return 1; }
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if(status) {
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warnx("piggyback returned %x",status);
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return 3;
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}
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if (forceaddr)
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offset = forceaddr;
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else {
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/* a kludge to dynamically figure out where to start it */
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if (stat (obj, &st) < 0) {
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warn("cannot get size of compressed data");
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return 3;
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}
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zip_size = (int)st.st_size;
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offset = entry + size - zip_size + 0x8000; /* fudge factor */
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}
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sprintf(base, "0x%x", roundup(offset, 4096));
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Pld = fork();
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if (Pld < 0) { warn("fork()"); return 1; }
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if (!Pld) {
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execlp("ld",
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"ld",
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"-Bstatic",
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"-Z",
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"-T",
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base,
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"-o",
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out,
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"/usr/lib/aout/kzhead.o",
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obj,
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"/usr/lib/aout/kztail.o",
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0);
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exit(2);
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}
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if (waitpid(Pld, &status,0) < 0)
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{ warn("waitpid(Pld)"); return 1; }
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if(status) {
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warnx("ld returned %x",status);
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return 3;
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}
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if (verbose) {
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fdn = open(obj ,O_RDONLY);
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if(fdn<0) {
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warn(obj);
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return 3;
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}
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/* figure out how big the compressed image is */
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if (read (fdn, (char *)&hdr, sizeof(hdr)) != sizeof(hdr)) {
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warn(obj);
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return 3;
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}
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close(fdn);
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size = hdr.a_text + hdr.a_data + hdr.a_bss;
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printf("kzip data start address will be: 0x%x\n",offset);
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printf("kzip data end address will be: 0x%x\n",offset+size);
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}
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unlink(obj);
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exit(0);
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}
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int
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extract (char *file)
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{
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int sz;
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char buf[BUFSIZ];
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struct exec hdr;
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if (read (0, (char *)&hdr, sizeof(hdr)) != sizeof(hdr))
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err(2, file);
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if (hdr.a_magic != ZMAGIC)
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errx(2, "bad magic in file %s, probably not a kernel", file);
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if (lseek (0, N_TXTOFF(hdr), 0) < 0)
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err(2, file);
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sz = N_SYMOFF (hdr) - N_TXTOFF (hdr);
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while (sz) {
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int l, n;
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l = sz;
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if (l > sizeof(buf))
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l = sizeof(buf);
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n = read (0, buf, l);
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if (n != l) {
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if (n == -1)
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err(1, file);
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else
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errx(1, "unexpected EOF");
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}
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write (1, buf, l);
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sz -= l;
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}
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exit(0);
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}
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char string_names[] = {"_input_data\0_input_len\0"};
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struct nlist var_names[2] = { /* Symbol table */
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{ { (char*) 4 }, N_EXT|N_TEXT, 0, 0, 0 }, /* _input_data */
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{ { (char*) 16 }, N_EXT|N_TEXT, 0, 0, 0 }, /* _input_len */
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};
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int
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piggyback(char *file)
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{
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int n, len;
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struct exec hdr; /* object header */
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char image[MAXIMAGE]; /* kernel image buffer */
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len = 0;
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while ((n = read (0, &image[len], sizeof(image)-len+1)) > 0)
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len += n;
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if (n < 0)
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err(1, "stdin");
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if (len >= sizeof(image))
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errx(1, "input too large");
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/*
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* Output object header
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*/
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memset(&hdr,0,sizeof hdr);
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hdr.a_magic = OMAGIC;
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hdr.a_text = len + sizeof(long);
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hdr.a_syms = sizeof(var_names);
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write (1, (char *)&hdr, sizeof(hdr));
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/*
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* Output text segment (compressed system & len)
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*/
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write (1, image, len);
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write (1, (char *)&len, sizeof(len));
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/*
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* Output symbol table
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*/
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var_names[1].n_value = len;
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write (1, (char *)&var_names, sizeof(var_names));
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/*
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* Output string table
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*/
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len = sizeof(string_names) + sizeof(len);
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write (1, (char *)&len, sizeof(len));
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write (1, string_names, sizeof(string_names));
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return (0);
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}
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