289 lines
7.1 KiB
C
289 lines
7.1 KiB
C
/*
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* linux/tools/build.c
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*
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* Copyright (C) 1991, 1992 Linus Torvalds
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*/
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/*
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* This file builds a disk-image from three different files:
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*
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* - bootsect: exactly 512 bytes of 8086 machine code, loads the rest
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* - setup: 8086 machine code, sets up system parm
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* - system: 80386 code for actual system
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*
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* It does some checking that all files are of the correct type, and
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* just writes the result to stdout, removing headers and padding to
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* the right amount. It also writes some system data to stderr.
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*/
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/*
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* Changes by tytso to allow root device specification
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* High loaded stuff by Hans Lermen & Werner Almesberger, Feb. 1996
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* Cross compiling fixes by Gertjan van Wingerde, July 1996
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*/
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#include <stdio.h> /* fprintf */
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#include <string.h>
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#include <stdlib.h> /* contains exit */
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#include <sys/types.h> /* unistd.h needs this */
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#include <sys/stat.h>
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#include <sys/sysmacros.h>
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#include <unistd.h> /* contains read/write */
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#include <fcntl.h>
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#include <linux/a.out.h>
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#include <errno.h>
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#define MINIX_HEADER 32
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#define N_MAGIC_OFFSET 1024
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#ifndef __BFD__
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static int GCC_HEADER = sizeof(struct exec);
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#endif
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#ifdef __BIG_KERNEL__
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#define SYS_SIZE 0xffff
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#else
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#define SYS_SIZE DEF_SYSSIZE
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#endif
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#define DEFAULT_MAJOR_ROOT 0
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#define DEFAULT_MINOR_ROOT 0
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/* max nr of sectors of setup: don't change unless you also change
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* bootsect etc */
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#define SETUP_SECTS 4
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#define STRINGIFY(x) #x
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typedef union {
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int i;
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long l;
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short s[2];
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char b[4];
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} conv;
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long intel_long(long l)
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{
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conv t;
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t.b[0] = l & 0xff; l >>= 8;
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t.b[1] = l & 0xff; l >>= 8;
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t.b[2] = l & 0xff; l >>= 8;
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t.b[3] = l & 0xff; l >>= 8;
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return t.l;
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}
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int intel_int(int i)
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{
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conv t;
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t.b[0] = i & 0xff; i >>= 8;
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t.b[1] = i & 0xff; i >>= 8;
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t.b[2] = i & 0xff; i >>= 8;
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t.b[3] = i & 0xff; i >>= 8;
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return t.i;
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}
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short intel_short(short l)
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{
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conv t;
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t.b[0] = l & 0xff; l >>= 8;
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t.b[1] = l & 0xff; l >>= 8;
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return t.s[0];
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}
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void die(const char * str)
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{
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fprintf(stderr,"%s\n",str);
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exit(1);
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}
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void usage(void)
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{
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die("Usage: build bootsect setup system [rootdev] [> image]");
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}
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int main(int argc, char ** argv)
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{
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int i,c,id,sz,tmp_int;
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unsigned long sys_size, tmp_long;
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char buf[1024];
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#ifndef __BFD__
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struct exec *ex = (struct exec *)buf;
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#endif
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char major_root, minor_root;
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struct stat sb;
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unsigned char setup_sectors;
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if ((argc < 4) || (argc > 5))
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usage();
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if (argc > 4) {
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if (!strcmp(argv[4], "CURRENT")) {
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if (stat("/", &sb)) {
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perror("/");
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die("Couldn't stat /");
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}
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major_root = major(sb.st_dev);
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minor_root = minor(sb.st_dev);
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} else if (strcmp(argv[4], "FLOPPY")) {
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if (stat(argv[4], &sb)) {
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perror(argv[4]);
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die("Couldn't stat root device.");
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}
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major_root = major(sb.st_rdev);
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minor_root = minor(sb.st_rdev);
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} else {
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major_root = 0;
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minor_root = 0;
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}
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} else {
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major_root = DEFAULT_MAJOR_ROOT;
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minor_root = DEFAULT_MINOR_ROOT;
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}
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fprintf(stderr, "Root device is (%d, %d)\n", major_root, minor_root);
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for (i=0;i<sizeof buf; i++) buf[i]=0;
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if ((id=open(argv[1],O_RDONLY,0))<0)
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die("Unable to open 'boot'");
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if (read(id,buf,MINIX_HEADER) != MINIX_HEADER)
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die("Unable to read header of 'boot'");
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if (((long *) buf)[0]!=intel_long(0x04100301))
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die("Non-Minix header of 'boot'");
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if (((long *) buf)[1]!=intel_long(MINIX_HEADER))
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die("Non-Minix header of 'boot'");
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if (((long *) buf)[3] != 0)
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die("Illegal data segment in 'boot'");
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if (((long *) buf)[4] != 0)
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die("Illegal bss in 'boot'");
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if (((long *) buf)[5] != 0)
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die("Non-Minix header of 'boot'");
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if (((long *) buf)[7] != 0)
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die("Illegal symbol table in 'boot'");
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i=read(id,buf,sizeof buf);
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fprintf(stderr,"Boot sector %d bytes.\n",i);
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if (i != 512)
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die("Boot block must be exactly 512 bytes");
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if ((*(unsigned short *)(buf+510)) != (unsigned short)intel_short(0xAA55))
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die("Boot block hasn't got boot flag (0xAA55)");
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buf[508] = (char) minor_root;
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buf[509] = (char) major_root;
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i=write(1,buf,512);
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if (i!=512)
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die("Write call failed");
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close (id);
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if ((id=open(argv[2],O_RDONLY,0))<0)
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die("Unable to open 'setup'");
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if (read(id,buf,MINIX_HEADER) != MINIX_HEADER)
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die("Unable to read header of 'setup'");
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if (((long *) buf)[0]!=intel_long(0x04100301))
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die("Non-Minix header of 'setup'");
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if (((long *) buf)[1]!=intel_long(MINIX_HEADER))
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die("Non-Minix header of 'setup'");
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if (((long *) buf)[3] != 0)
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die("Illegal data segment in 'setup'");
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if (((long *) buf)[4] != 0)
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die("Illegal bss in 'setup'");
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if (((long *) buf)[5] != 0)
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die("Non-Minix header of 'setup'");
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if (((long *) buf)[7] != 0)
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die("Illegal symbol table in 'setup'");
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for (i=0 ; (c=read(id,buf,sizeof buf))>0 ; i+=c )
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#ifdef __BIG_KERNEL__
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{
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if (!i) {
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/* Working with memcpy because of alignment constraints
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on Sparc - Gertjan */
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memcpy(&tmp_long, &buf[2], sizeof(long));
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if (tmp_long != intel_long(0x53726448) )
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die("Wrong magic in loader header of 'setup'");
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memcpy(&tmp_int, &buf[6], sizeof(int));
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if (tmp_int < intel_int(0x200))
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die("Wrong version of loader header of 'setup'");
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buf[0x11] = 1; /* LOADED_HIGH */
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tmp_long = intel_long(0x100000);
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memcpy(&buf[0x14], &tmp_long, sizeof(long)); /* code32_start */
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}
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#endif
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if (write(1,buf,c)!=c)
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die("Write call failed");
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#ifdef __BIG_KERNEL__
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}
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#endif
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if (c != 0)
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die("read-error on 'setup'");
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close (id);
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setup_sectors = (unsigned char)((i + 511) / 512);
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/* for compatibility with LILO */
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if (setup_sectors < SETUP_SECTS)
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setup_sectors = SETUP_SECTS;
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fprintf(stderr,"Setup is %d bytes.\n",i);
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for (c=0 ; c<sizeof(buf) ; c++)
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buf[c] = '\0';
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while (i < setup_sectors * 512) {
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c = setup_sectors * 512 - i;
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if (c > sizeof(buf))
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c = sizeof(buf);
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if (write(1,buf,c) != c)
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die("Write call failed");
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i += c;
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}
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if ((id=open(argv[3],O_RDONLY,0))<0)
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die("Unable to open 'system'");
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#ifndef __BFD__
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if (read(id,buf,GCC_HEADER) != GCC_HEADER)
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die("Unable to read header of 'system'");
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if (N_MAGIC(*ex) == ZMAGIC) {
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GCC_HEADER = N_MAGIC_OFFSET;
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lseek(id, GCC_HEADER, SEEK_SET);
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} else if (N_MAGIC(*ex) != QMAGIC)
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die("Non-GCC header of 'system'");
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fprintf(stderr,"System is %d kB (%d kB code, %d kB data and %d kB bss)\n",
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(ex->a_text+ex->a_data+ex->a_bss)/1024,
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ex->a_text /1024,
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ex->a_data /1024,
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ex->a_bss /1024);
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sz = N_SYMOFF(*ex) - GCC_HEADER + 4;
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#else
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if (fstat (id, &sb)) {
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perror ("fstat");
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die ("Unable to stat 'system'");
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}
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sz = sb.st_size;
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fprintf (stderr, "System is %d kB\n", sz/1024);
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#endif
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sys_size = (sz + 15) / 16;
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if (sys_size > SYS_SIZE)
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die("System is too big");
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while (sz > 0) {
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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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if ((n=read(id, buf, l)) != l) {
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if (n == -1)
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perror(argv[1]);
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else
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fprintf(stderr, "Unexpected EOF\n");
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die("Can't read 'system'");
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}
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if (write(1, buf, l) != l)
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die("Write failed");
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sz -= l;
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}
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close(id);
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if (lseek(1, 497, 0) == 497) {
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if (write(1, &setup_sectors, 1) != 1)
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die("Write of setup sectors failed");
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}
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if (lseek(1,500,0) == 500) {
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buf[0] = (sys_size & 0xff);
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buf[1] = ((sys_size >> 8) & 0xff);
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if (write(1, buf, 2) != 2)
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die("Write failed");
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}
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return(0);
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}
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