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Linux/arch/cris/boot/tools/build.c

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

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