aboutsummaryrefslogtreecommitdiffstats
path: root/arch/x86/boot/tools/build.c
blob: 0702d2531bc7f441364adca7ebc2d0e1a227f0bd (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
/*
 *  Copyright (C) 1991, 1992  Linus Torvalds
 *  Copyright (C) 1997 Martin Mares
 *  Copyright (C) 2007 H. Peter Anvin
 */

/*
 * This file builds a disk-image from three different files:
 *
 * - setup: 8086 machine code, sets up system parm
 * - system: 80386 code for actual system
 * - zoffset.h: header with ZO_* defines
 *
 * It does some checking that all files are of the correct type, and writes
 * the result to the specified destination, removing headers and padding to
 * the right amount. It also writes some system data to stdout.
 */

/*
 * Changes by tytso to allow root device specification
 * High loaded stuff by Hans Lermen & Werner Almesberger, Feb. 1996
 * Cross compiling fixes by Gertjan van Wingerde, July 1996
 * Rewritten by Martin Mares, April 1997
 * Substantially overhauled by H. Peter Anvin, April 2007
 */

#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <stdarg.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/mman.h>
#include <tools/le_byteshift.h>

typedef unsigned char  u8;
typedef unsigned short u16;
typedef unsigned int   u32;

#define DEFAULT_MAJOR_ROOT 0
#define DEFAULT_MINOR_ROOT 0
#define DEFAULT_ROOT_DEV (DEFAULT_MAJOR_ROOT << 8 | DEFAULT_MINOR_ROOT)

/* Minimal number of setup sectors */
#define SETUP_SECT_MIN 5
#define SETUP_SECT_MAX 64

/* This must be large enough to hold the entire setup */
u8 buf[SETUP_SECT_MAX*512];

#define PECOFF_RELOC_RESERVE 0x20

unsigned long efi32_stub_entry;
unsigned long efi64_stub_entry;
unsigned long efi_pe_entry;
unsigned long startup_64;

/*----------------------------------------------------------------------*/

static const u32 crctab32[] = {
	0x00000000, 0x77073096, 0xee0e612c, 0x990951ba, 0x076dc419,
	0x706af48f, 0xe963a535, 0x9e6495a3, 0x0edb8832, 0x79dcb8a4,
	0xe0d5e91e, 0x97d2d988, 0x09b64c2b, 0x7eb17cbd, 0xe7b82d07,
	0x90bf1d91, 0x1db71064, 0x6ab020f2, 0xf3b97148, 0x84be41de,
	0x1adad47d, 0x6ddde4eb, 0xf4d4b551, 0x83d385c7, 0x136c9856,
	0x646ba8c0, 0xfd62f97a, 0x8a65c9ec, 0x14015c4f, 0x63066cd9,
	0xfa0f3d63, 0x8d080df5, 0x3b6e20c8, 0x4c69105e, 0xd56041e4,
	0xa2677172, 0x3c03e4d1, 0x4b04d447, 0xd20d85fd, 0xa50ab56b,
	0x35b5a8fa, 0x42b2986c, 0xdbbbc9d6, 0xacbcf940, 0x32d86ce3,
	0x45df5c75, 0xdcd60dcf, 0xabd13d59, 0x26d930ac, 0x51de003a,
	0xc8d75180, 0xbfd06116, 0x21b4f4b5, 0x56b3c423, 0xcfba9599,
	0xb8bda50f, 0x2802b89e, 0x5f058808, 0xc60cd9b2, 0xb10be924,
	0x2f6f7c87, 0x58684c11, 0xc1611dab, 0xb6662d3d, 0x76dc4190,
	0x01db7106, 0x98d220bc, 0xefd5102a, 0x71b18589, 0x06b6b51f,
	0x9fbfe4a5, 0xe8b8d433, 0x7807c9a2, 0x0f00f934, 0x9609a88e,
	0xe10e9818, 0x7f6a0dbb, 0x086d3d2d, 0x91646c97, 0xe6635c01,
	0x6b6b51f4, 0x1c6c6162, 0x856530d8, 0xf262004e, 0x6c0695ed,
	0x1b01a57b, 0x8208f4c1, 0xf50fc457, 0x65b0d9c6, 0x12b7e950,
	0x8bbeb8ea, 0xfcb9887c, 0x62dd1ddf, 0x15da2d49, 0x8cd37cf3,
	0xfbd44c65, 0x4db26158, 0x3ab551ce, 0xa3bc0074, 0xd4bb30e2,
	0x4adfa541, 0x3dd895d7, 0xa4d1c46d, 0xd3d6f4fb, 0x4369e96a,
	0x346ed9fc, 0xad678846, 0xda60b8d0, 0x44042d73, 0x33031de5,
	0xaa0a4c5f, 0xdd0d7cc9, 0x5005713c, 0x270241aa, 0xbe0b1010,
	0xc90c2086, 0x5768b525, 0x206f85b3, 0xb966d409, 0xce61e49f,
	0x5edef90e, 0x29d9c998, 0xb0d09822, 0xc7d7a8b4, 0x59b33d17,
	0x2eb40d81, 0xb7bd5c3b, 0xc0ba6cad, 0xedb88320, 0x9abfb3b6,
	0x03b6e20c, 0x74b1d29a, 0xead54739, 0x9dd277af, 0x04db2615,
	0x73dc1683, 0xe3630b12, 0x94643b84, 0x0d6d6a3e, 0x7a6a5aa8,
	0xe40ecf0b, 0x9309ff9d, 0x0a00ae27, 0x7d079eb1, 0xf00f9344,
	0x8708a3d2, 0x1e01f268, 0x6906c2fe, 0xf762575d, 0x806567cb,
	0x196c3671, 0x6e6b06e7, 0xfed41b76, 0x89d32be0, 0x10da7a5a,
	0x67dd4acc, 0xf9b9df6f, 0x8ebeeff9, 0x17b7be43, 0x60b08ed5,
	0xd6d6a3e8, 0xa1d1937e, 0x38d8c2c4, 0x4fdff252, 0xd1bb67f1,
	0xa6bc5767, 0x3fb506dd, 0x48b2364b, 0xd80d2bda, 0xaf0a1b4c,
	0x36034af6, 0x41047a60, 0xdf60efc3, 0xa867df55, 0x316e8eef,
	0x4669be79, 0xcb61b38c, 0xbc66831a, 0x256fd2a0, 0x5268e236,
	0xcc0c7795, 0xbb0b4703, 0x220216b9, 0x5505262f, 0xc5ba3bbe,
	0xb2bd0b28, 0x2bb45a92, 0x5cb36a04, 0xc2d7ffa7, 0xb5d0cf31,
	0x2cd99e8b, 0x5bdeae1d, 0x9b64c2b0, 0xec63f226, 0x756aa39c,
	0x026d930a, 0x9c0906a9, 0xeb0e363f, 0x72076785, 0x05005713,
	0x95bf4a82, 0xe2b87a14, 0x7bb12bae, 0x0cb61b38, 0x92d28e9b,
	0xe5d5be0d, 0x7cdcefb7, 0x0bdbdf21, 0x86d3d2d4, 0xf1d4e242,
	0x68ddb3f8, 0x1fda836e, 0x81be16cd, 0xf6b9265b, 0x6fb077e1,
	0x18b74777, 0x88085ae6, 0xff0f6a70, 0x66063bca, 0x11010b5c,
	0x8f659eff, 0xf862ae69, 0x616bffd3, 0x166ccf45, 0xa00ae278,
	0xd70dd2ee, 0x4e048354, 0x3903b3c2, 0xa7672661, 0xd06016f7,
	0x4969474d, 0x3e6e77db, 0xaed16a4a, 0xd9d65adc, 0x40df0b66,
	0x37d83bf0, 0xa9bcae53, 0xdebb9ec5, 0x47b2cf7f, 0x30b5ffe9,
	0xbdbdf21c, 0xcabac28a, 0x53b39330, 0x24b4a3a6, 0xbad03605,
	0xcdd70693, 0x54de5729, 0x23d967bf, 0xb3667a2e, 0xc4614ab8,
	0x5d681b02, 0x2a6f2b94, 0xb40bbe37, 0xc30c8ea1, 0x5a05df1b,
	0x2d02ef8d
};

static u32 partial_crc32_one(u8 c, u32 crc)
{
	return crctab32[(crc ^ c) & 0xff] ^ (crc >> 8);
}

static u32 partial_crc32(const u8 *s, int len, u32 crc)
{
	while (len--)
		crc = partial_crc32_one(*s++, crc);
	return crc;
}

static void die(const char * str, ...)
{
	va_list args;
	va_start(args, str);
	vfprintf(stderr, str, args);
	fputc('\n', stderr);
	exit(1);
}

static void usage(void)
{
	die("Usage: build setup system zoffset.h image");
}

#ifdef CONFIG_EFI_STUB

static void update_pecoff_section_header_fields(char *section_name, u32 vma, u32 size, u32 datasz, u32 offset)
{
	unsigned int pe_header;
	unsigned short num_sections;
	u8 *section;

	pe_header = get_unaligned_le32(&buf[0x3c]);
	num_sections = get_unaligned_le16(&buf[pe_header + 6]);

#ifdef CONFIG_X86_32
	section = &buf[pe_header + 0xa8];
#else
	section = &buf[pe_header + 0xb8];
#endif

	while (num_sections > 0) {
		if (strncmp((char*)section, section_name, 8) == 0) {
			/* section header size field */
			put_unaligned_le32(size, section + 0x8);

			/* section header vma field */
			put_unaligned_le32(vma, section + 0xc);

			/* section header 'size of initialised data' field */
			put_unaligned_le32(datasz, section + 0x10);

			/* section header 'file offset' field */
			put_unaligned_le32(offset, section + 0x14);

			break;
		}
		section += 0x28;
		num_sections--;
	}
}

static void update_pecoff_section_header(char *section_name, u32 offset, u32 size)
{
	update_pecoff_section_header_fields(section_name, offset, size, size, offset);
}

static void update_pecoff_setup_and_reloc(unsigned int size)
{
	u32 setup_offset = 0x200;
	u32 reloc_offset = size - PECOFF_RELOC_RESERVE;
	u32 setup_size = reloc_offset - setup_offset;

	update_pecoff_section_header(".setup", setup_offset, setup_size);
	update_pecoff_section_header(".reloc", reloc_offset, PECOFF_RELOC_RESERVE);

	/*
	 * Modify .reloc section contents with a single entry. The
	 * relocation is applied to offset 10 of the relocation section.
	 */
	put_unaligned_le32(reloc_offset + 10, &buf[reloc_offset]);
	put_unaligned_le32(10, &buf[reloc_offset + 4]);
}

static void update_pecoff_text(unsigned int text_start, unsigned int file_sz)
{
	unsigned int pe_header;
	unsigned int text_sz = file_sz - text_start;

	pe_header = get_unaligned_le32(&buf[0x3c]);

	/*
	 * Size of code: Subtract the size of the first sector (512 bytes)
	 * which includes the header.
	 */
	put_unaligned_le32(file_sz - 512, &buf[pe_header + 0x1c]);

	/*
	 * Address of entry point for PE/COFF executable
	 */
	put_unaligned_le32(text_start + efi_pe_entry, &buf[pe_header + 0x28]);

	update_pecoff_section_header(".text", text_start, text_sz);
}

static void update_pecoff_bss(unsigned int file_sz, unsigned int init_sz)
{
	unsigned int pe_header;
	unsigned int bss_sz = init_sz - file_sz;

	pe_header = get_unaligned_le32(&buf[0x3c]);

	/* Size of uninitialized data */
	put_unaligned_le32(bss_sz, &buf[pe_header + 0x24]);

	/* Size of image */
	put_unaligned_le32(init_sz, &buf[pe_header + 0x50]);

	update_pecoff_section_header_fields(".bss", file_sz, bss_sz, 0, 0);
}

static int reserve_pecoff_reloc_section(int c)
{
	/* Reserve 0x20 bytes for .reloc section */
	memset(buf+c, 0, PECOFF_RELOC_RESERVE);
	return PECOFF_RELOC_RESERVE;
}

static void efi_stub_defaults(void)
{
	/* Defaults for old kernel */
#ifdef CONFIG_X86_32
	efi_pe_entry = 0x10;
#else
	efi_pe_entry = 0x210;
	startup_64 = 0x200;
#endif
}

static void efi_stub_entry_update(void)
{
	unsigned long addr = efi32_stub_entry;

#ifdef CONFIG_X86_64
	/* Yes, this is really how we defined it :( */
	addr = efi64_stub_entry - 0x200;
#endif

#ifdef CONFIG_EFI_MIXED
	if (efi32_stub_entry != addr)
		die("32-bit and 64-bit EFI entry points do not match\n");
#endif
	put_unaligned_le32(addr, &buf[0x264]);
}

#else

static inline void update_pecoff_setup_and_reloc(unsigned int size) {}
static inline void update_pecoff_text(unsigned int text_start,
				      unsigned int file_sz) {}
static inline void update_pecoff_bss(unsigned int file_sz,
				     unsigned int init_sz) {}
static inline void efi_stub_defaults(void) {}
static inline void efi_stub_entry_update(void) {}

static inline int reserve_pecoff_reloc_section(int c)
{
	return 0;
}
#endif /* CONFIG_EFI_STUB */


/*
 * Parse zoffset.h and find the entry points. We could just #include zoffset.h
 * but that would mean tools/build would have to be rebuilt every time. It's
 * not as if parsing it is hard...
 */
#define PARSE_ZOFS(p, sym) do { \
	if (!strncmp(p, "#define ZO_" #sym " ", 11+sizeof(#sym)))	\
		sym = strtoul(p + 11 + sizeof(#sym), NULL, 16);		\
} while (0)

static void parse_zoffset(char *fname)
{
	FILE *file;
	char *p;
	int c;

	file = fopen(fname, "r");
	if (!file)
		die("Unable to open `%s': %m", fname);
	c = fread(buf, 1, sizeof(buf) - 1, file);
	if (ferror(file))
		die("read-error on `zoffset.h'");
	fclose(file);
	buf[c] = 0;

	p = (char *)buf;

	while (p && *p) {
		PARSE_ZOFS(p, efi32_stub_entry);
		PARSE_ZOFS(p, efi64_stub_entry);
		PARSE_ZOFS(p, efi_pe_entry);
		PARSE_ZOFS(p, startup_64);

		p = strchr(p, '\n');
		while (p && (*p == '\r' || *p == '\n'))
			p++;
	}
}

int main(int argc, char ** argv)
{
	unsigned int i, sz, setup_sectors, init_sz;
	int c;
	u32 sys_size;
	struct stat sb;
	FILE *file, *dest;
	int fd;
	void *kernel;
	u32 crc = 0xffffffffUL;

	efi_stub_defaults();

	if (argc != 5)
		usage();
	parse_zoffset(argv[3]);

	dest = fopen(argv[4], "w");
	if (!dest)
		die("Unable to write `%s': %m", argv[4]);

	/* Copy the setup code */
	file = fopen(argv[1], "r");
	if (!file)
		die("Unable to open `%s': %m", argv[1]);
	c = fread(buf, 1, sizeof(buf), file);
	if (ferror(file))
		die("read-error on `setup'");
	if (c < 1024)
		die("The setup must be at least 1024 bytes");
	if (get_unaligned_le16(&buf[510]) != 0xAA55)
		die("Boot block hasn't got boot flag (0xAA55)");
	fclose(file);

	c += reserve_pecoff_reloc_section(c);

	/* Pad unused space with zeros */
	setup_sectors = (c + 511) / 512;
	if (setup_sectors < SETUP_SECT_MIN)
		setup_sectors = SETUP_SECT_MIN;
	i = setup_sectors*512;
	memset(buf+c, 0, i-c);

	update_pecoff_setup_and_reloc(i);

	/* Set the default root device */
	put_unaligned_le16(DEFAULT_ROOT_DEV, &buf[508]);

	printf("Setup is %d bytes (padded to %d bytes).\n", c, i);

	/* Open and stat the kernel file */
	fd = open(argv[2], O_RDONLY);
	if (fd < 0)
		die("Unable to open `%s': %m", argv[2]);
	if (fstat(fd, &sb))
		die("Unable to stat `%s': %m", argv[2]);
	sz = sb.st_size;
	printf("System is %d kB\n", (sz+1023)/1024);
	kernel = mmap(NULL, sz, PROT_READ, MAP_SHARED, fd, 0);
	if (kernel == MAP_FAILED)
		die("Unable to mmap '%s': %m", argv[2]);
	/* Number of 16-byte paragraphs, including space for a 4-byte CRC */
	sys_size = (sz + 15 + 4) / 16;

	/* Patch the setup code with the appropriate size parameters */
	buf[0x1f1] = setup_sectors-1;
	put_unaligned_le32(sys_size, &buf[0x1f4]);

	update_pecoff_text(setup_sectors * 512, i + (sys_size * 16));
	init_sz = get_unaligned_le32(&buf[0x260]);
	update_pecoff_bss(i + (sys_size * 16), init_sz);

	efi_stub_entry_update();

	crc = partial_crc32(buf, i, crc);
	if (fwrite(buf, 1, i, dest) != i)
		die("Writing setup failed");

	/* Copy the kernel code */
	crc = partial_crc32(kernel, sz, crc);
	if (fwrite(kernel, 1, sz, dest) != sz)
		die("Writing kernel failed");

	/* Add padding leaving 4 bytes for the checksum */
	while (sz++ < (sys_size*16) - 4) {
		crc = partial_crc32_one('\0', crc);
		if (fwrite("\0", 1, 1, dest) != 1)
			die("Writing padding failed");
	}

	/* Write the CRC */
	printf("CRC %x\n", crc);
	put_unaligned_le32(crc, buf);
	if (fwrite(buf, 1, 4, dest) != 4)
		die("Writing CRC failed");

	/* Catch any delayed write failures */
	if (fclose(dest))
		die("Writing image failed");

	close(fd);

	/* Everything is OK */
	return 0;
}