arch/cris/boot/tools/build.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  *  linux/tools/build.c
   4  *
   5  *  Copyright (C) 1991, 1992  Linus Torvalds
   6  */
   7
   8 /*
   9  * This file builds a disk-image from three different files:
  10  *
  11  * - bootsect: exactly 512 bytes of 8086 machine code, loads the rest
  12  * - setup: 8086 machine code, sets up system parm
  13  * - system: 80386 code for actual system
  14  *
  15  * It does some checking that all files are of the correct type, and
  16  * just writes the result to stdout, removing headers and padding to
  17  * the right amount. It also writes some system data to stderr.
  18  */
  19
  20 /*
  21  * Changes by tytso to allow root device specification
  22  * High loaded stuff by Hans Lermen & Werner Almesberger, Feb. 1996
  23  * Cross compiling fixes by Gertjan van Wingerde, July 1996
  24  */
  25
  26 #include <stdio.h>      /* fprintf */
  27 #include <string.h>
  28 #include <stdlib.h>     /* contains exit */
  29 #include <sys/types.h>  /* unistd.h needs this */
  30 #include <sys/stat.h>
  31 #include <sys/sysmacros.h>
  32 #include <unistd.h>     /* contains read/write */
  33 #include <fcntl.h>
  34 #include <errno.h>
  35
  36 #define MINIX_HEADER 32
  37
  38 #define N_MAGIC_OFFSET 1024
  39 #ifndef __BFD__
  40 static int GCC_HEADER = sizeof(struct exec);
  41 #endif
  42
  43 #ifdef __BIG_KERNEL__
  44 #define SYS_SIZE 0xffff
  45 #else
  46 #define SYS_SIZE DEF_SYSSIZE
  47 #endif
  48
  49 #define DEFAULT_MAJOR_ROOT 0
  50 #define DEFAULT_MINOR_ROOT 0
  51
  52 /* max nr of sectors of setup: don't change unless you also change
  53  * bootsect etc */
  54 #define SETUP_SECTS 4
  55
  56 #define STRINGIFY(x) #x
  57
  58 typedef union {
  59         int i;
  60         long l;
  61         short s[2];
  62         char b[4];
  63 } conv;
  64
  65 long intel_long(long l)
  66 {
  67         conv t;
  68
  69         t.b[0] = l & 0xff; l >>= 8;
  70         t.b[1] = l & 0xff; l >>= 8;
  71         t.b[2] = l & 0xff; l >>= 8;
  72         t.b[3] = l & 0xff; l >>= 8;
  73         return t.l;
  74 }
  75
  76 int intel_int(int i)
  77 {
  78         conv t;
  79
  80         t.b[0] = i & 0xff; i >>= 8;
  81         t.b[1] = i & 0xff; i >>= 8;
  82         t.b[2] = i & 0xff; i >>= 8;
  83         t.b[3] = i & 0xff; i >>= 8;
  84         return t.i;
  85 }
  86
  87 short intel_short(short l)
  88 {
  89         conv t;
  90
  91         t.b[0] = l & 0xff; l >>= 8;
  92         t.b[1] = l & 0xff; l >>= 8;
  93         return t.s[0];
  94 }
  95
  96 void die(const char * str)
  97 {
  98         fprintf(stderr,"%s\n",str);
  99         exit(1);
 100 }
 101
 102 void usage(void)
 103 {
 104         die("Usage: build bootsect setup system [rootdev] [> image]");
 105 }
 106
 107 int main(int argc, char ** argv)
 108 {
 109         int i,c,id,sz,tmp_int;
 110         unsigned long sys_size, tmp_long;
 111         char buf[1024];
 112 #ifndef __BFD__
 113         struct exec *ex = (struct exec *)buf;
 114 #endif
 115         char major_root, minor_root;
 116         struct stat sb;
 117         unsigned char setup_sectors;
 118
 119         if ((argc < 4) || (argc > 5))
 120                 usage();
 121         if (argc > 4) {
 122                 if (!strcmp(argv[4], "CURRENT")) {
 123                         if (stat("/", &sb)) {
 124                                 perror("/");
 125                                 die("Couldn't stat /");
 126                         }
 127                         major_root = major(sb.st_dev);
 128                         minor_root = minor(sb.st_dev);
 129                 } else if (strcmp(argv[4], "FLOPPY")) {
 130                         if (stat(argv[4], &sb)) {
 131                                 perror(argv[4]);
 132                                 die("Couldn't stat root device.");
 133                         }
 134                         major_root = major(sb.st_rdev);
 135                         minor_root = minor(sb.st_rdev);
 136                 } else {
 137                         major_root = 0;
 138                         minor_root = 0;
 139                 }
 140         } else {
 141                 major_root = DEFAULT_MAJOR_ROOT;
 142                 minor_root = DEFAULT_MINOR_ROOT;
 143         }
 144         fprintf(stderr, "Root device is (%d, %d)\n", major_root, minor_root);
 145         for (i=0;i<sizeof buf; i++) buf[i]=0;
 146         if ((id=open(argv[1],O_RDONLY,0))<0)
 147                 die("Unable to open 'boot'");
 148         if (read(id,buf,MINIX_HEADER) != MINIX_HEADER)
 149                 die("Unable to read header of 'boot'");
 150         if (((long *) buf)[0]!=intel_long(0x04100301))
 151                 die("Non-Minix header of 'boot'");
 152         if (((long *) buf)[1]!=intel_long(MINIX_HEADER))
 153                 die("Non-Minix header of 'boot'");
 154         if (((long *) buf)[3] != 0)
 155                 die("Illegal data segment in 'boot'");
 156         if (((long *) buf)[4] != 0)
 157                 die("Illegal bss in 'boot'");
 158         if (((long *) buf)[5] != 0)
 159                 die("Non-Minix header of 'boot'");
 160         if (((long *) buf)[7] != 0)
 161                 die("Illegal symbol table in 'boot'");
 162         i=read(id,buf,sizeof buf);
 163         fprintf(stderr,"Boot sector %d bytes.\n",i);
 164         if (i != 512)
 165                 die("Boot block must be exactly 512 bytes");
 166         if ((*(unsigned short *)(buf+510)) != (unsigned short)intel_short(0xAA55))
 167                 die("Boot block hasn't got boot flag (0xAA55)");
 168         buf[508] = (char) minor_root;
 169         buf[509] = (char) major_root;
 170         i=write(1,buf,512);
 171         if (i!=512)
 172                 die("Write call failed");
 173         close (id);
 174
 175         if ((id=open(argv[2],O_RDONLY,0))<0)
 176                 die("Unable to open 'setup'");
 177         if (read(id,buf,MINIX_HEADER) != MINIX_HEADER)
 178                 die("Unable to read header of 'setup'");
 179         if (((long *) buf)[0]!=intel_long(0x04100301))
 180                 die("Non-Minix header of 'setup'");
 181         if (((long *) buf)[1]!=intel_long(MINIX_HEADER))
 182                 die("Non-Minix header of 'setup'");
 183         if (((long *) buf)[3] != 0)
 184                 die("Illegal data segment in 'setup'");
 185         if (((long *) buf)[4] != 0)
 186                 die("Illegal bss in 'setup'");
 187         if (((long *) buf)[5] != 0)
 188                 die("Non-Minix header of 'setup'");
 189         if (((long *) buf)[7] != 0)
 190                 die("Illegal symbol table in 'setup'");
 191         for (i=0 ; (c=read(id,buf,sizeof buf))>0 ; i+=c )
 192 #ifdef __BIG_KERNEL__
 193         {
 194                 if (!i) {
 195                         /* Working with memcpy because of alignment constraints
 196                            on Sparc - Gertjan */
 197                         memcpy(&tmp_long, &buf[2], sizeof(long));
 198                         if (tmp_long != intel_long(0x53726448) )
 199                                 die("Wrong magic in loader header of 'setup'");
 200                         memcpy(&tmp_int, &buf[6], sizeof(int));
 201                         if (tmp_int < intel_int(0x200))
 202                                 die("Wrong version of loader header of 'setup'");
 203                         buf[0x11] = 1; /* LOADED_HIGH */
 204                         tmp_long = intel_long(0x100000);
 205                         memcpy(&buf[0x14], &tmp_long, sizeof(long));  /* code32_start */
 206                 }
 207 #endif
 208                 if (write(1,buf,c)!=c)
 209                         die("Write call failed");
 210 #ifdef __BIG_KERNEL__
 211         }
 212 #endif
 213         if (c != 0)
 214                 die("read-error on 'setup'");
 215         close (id);
 216         setup_sectors = (unsigned char)((i + 511) / 512);
 217         /* for compatibility with LILO */
 218         if (setup_sectors < SETUP_SECTS)
 219                 setup_sectors = SETUP_SECTS;
 220         fprintf(stderr,"Setup is %d bytes.\n",i);
 221         for (c=0 ; c<sizeof(buf) ; c++)
 222                 buf[c] = '\0';
 223         while (i < setup_sectors * 512) {
 224                 c = setup_sectors * 512 - i;
 225                 if (c > sizeof(buf))
 226                         c = sizeof(buf);
 227                 if (write(1,buf,c) != c)
 228                         die("Write call failed");
 229                 i += c;
 230         }
 231
 232         if ((id=open(argv[3],O_RDONLY,0))<0)
 233                 die("Unable to open 'system'");
 234 #ifndef __BFD__
 235         if (read(id,buf,GCC_HEADER) != GCC_HEADER)
 236                 die("Unable to read header of 'system'");
 237         if (N_MAGIC(*ex) == ZMAGIC) {
 238                 GCC_HEADER = N_MAGIC_OFFSET;
 239                 lseek(id, GCC_HEADER, SEEK_SET);
 240         } else if (N_MAGIC(*ex) != QMAGIC)
 241                 die("Non-GCC header of 'system'");
 242         fprintf(stderr,"System is %d kB (%d kB code, %d kB data and %d kB bss)\n",
 243                 (ex->a_text+ex->a_data+ex->a_bss)/1024,
 244                 ex->a_text /1024,
 245                 ex->a_data /1024,
 246                 ex->a_bss  /1024);
 247         sz = N_SYMOFF(*ex) - GCC_HEADER + 4;
 248 #else
 249         if (fstat (id, &sb)) {
 250           perror ("fstat");
 251           die ("Unable to stat 'system'");
 252         }
 253         sz = sb.st_size;
 254         fprintf (stderr, "System is %d kB\n", sz/1024);
 255 #endif
 256         sys_size = (sz + 15) / 16;
 257         if (sys_size > SYS_SIZE)
 258                 die("System is too big");
 259         while (sz > 0) {
 260                 int l, n;
 261
 262                 l = sz;
 263                 if (l > sizeof(buf))
 264                         l = sizeof(buf);
 265                 if ((n=read(id, buf, l)) != l) {
 266                         if (n == -1)
 267                                 perror(argv[1]);
 268                         else
 269                                 fprintf(stderr, "Unexpected EOF\n");
 270                         die("Can't read 'system'");
 271                 }
 272                 if (write(1, buf, l) != l)
 273                         die("Write failed");
 274                 sz -= l;
 275         }
 276         close(id);
 277         if (lseek(1, 497, 0) == 497) {
 278                 if (write(1, &setup_sectors, 1) != 1)
 279                         die("Write of setup sectors failed");
 280         }
 281         if (lseek(1,500,0) == 500) {
 282                 buf[0] = (sys_size & 0xff);
 283                 buf[1] = ((sys_size >> 8) & 0xff);
 284                 if (write(1, buf, 2) != 2)
 285                         die("Write failed");
 286         }
 287         return(0);
 288 }