summaryrefslogtreecommitdiff
path: root/tools/fit_image.c
blob: 47beaaff2a2836850746ebee3d27707b4aad24a1 (plain)
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
/*
 * (C) Copyright 2008 Semihalf
 *
 * (C) Copyright 2000-2004
 * DENX Software Engineering
 * Wolfgang Denk, wd@denx.de
 *
 * Updated-by: Prafulla Wadaskar <prafulla@marvell.com>
 *		FIT image specific code abstracted from mkimage.c
 *		some functions added to address abstraction
 *
 * All rights reserved.
 *
 * SPDX-License-Identifier:	GPL-2.0+
 */

#include "mkimage.h"
#include <image.h>
#include <u-boot/crc.h>

static image_header_t header;

static int fit_verify_header (unsigned char *ptr, int image_size,
			struct mkimage_params *params)
{
	return fdt_check_header ((void *)ptr);
}

static int fit_check_image_types (uint8_t type)
{
	if (type == IH_TYPE_FLATDT)
		return EXIT_SUCCESS;
	else
		return EXIT_FAILURE;
}

int mmap_fdt(struct mkimage_params *params, const char *fname, void **blobp,
		struct stat *sbuf)
{
	void *ptr;
	int fd;

	/* Load FIT blob into memory (we need to write hashes/signatures) */
	fd = open(fname, O_RDWR | O_BINARY);

	if (fd < 0) {
		fprintf(stderr, "%s: Can't open %s: %s\n",
			params->cmdname, fname, strerror(errno));
		unlink(fname);
		return -1;
	}

	if (fstat(fd, sbuf) < 0) {
		fprintf(stderr, "%s: Can't stat %s: %s\n",
			params->cmdname, fname, strerror(errno));
		unlink(fname);
		return -1;
	}

	ptr = mmap(0, sbuf->st_size, PROT_READ|PROT_WRITE, MAP_SHARED, fd, 0);
	if (ptr == MAP_FAILED) {
		fprintf(stderr, "%s: Can't read %s: %s\n",
			params->cmdname, fname, strerror(errno));
		unlink(fname);
		return -1;
	}

	/* check if ptr has a valid blob */
	if (fdt_check_header(ptr)) {
		fprintf(stderr, "%s: Invalid FIT blob\n", params->cmdname);
		unlink(fname);
		return -1;
	}

	*blobp = ptr;
	return fd;
}

/**
 * fit_handle_file - main FIT file processing function
 *
 * fit_handle_file() runs dtc to convert .its to .itb, includes
 * binary data, updates timestamp property and calculates hashes.
 *
 * datafile  - .its file
 * imagefile - .itb file
 *
 * returns:
 *     only on success, otherwise calls exit (EXIT_FAILURE);
 */
static int fit_handle_file (struct mkimage_params *params)
{
	char tmpfile[MKIMAGE_MAX_TMPFILE_LEN];
	char cmd[MKIMAGE_MAX_DTC_CMDLINE_LEN];
	int tfd, destfd = 0;
	void *dest_blob = NULL;
	struct stat sbuf;
	void *ptr;
	off_t destfd_size = 0;

	/* Flattened Image Tree (FIT) format  handling */
	debug ("FIT format handling\n");

	/* call dtc to include binary properties into the tmp file */
	if (strlen (params->imagefile) +
		strlen (MKIMAGE_TMPFILE_SUFFIX) + 1 > sizeof (tmpfile)) {
		fprintf (stderr, "%s: Image file name (%s) too long, "
				"can't create tmpfile",
				params->imagefile, params->cmdname);
		return (EXIT_FAILURE);
	}
	sprintf (tmpfile, "%s%s", params->imagefile, MKIMAGE_TMPFILE_SUFFIX);

	/* We either compile the source file, or use the existing FIT image */
	if (params->datafile) {
		/* dtc -I dts -O dtb -p 500 datafile > tmpfile */
		snprintf(cmd, sizeof(cmd), "%s %s %s > %s",
			 MKIMAGE_DTC, params->dtc, params->datafile, tmpfile);
		debug("Trying to execute \"%s\"\n", cmd);
	} else {
		snprintf(cmd, sizeof(cmd), "cp %s %s",
			 params->imagefile, tmpfile);
	}
	if (system (cmd) == -1) {
		fprintf (stderr, "%s: system(%s) failed: %s\n",
				params->cmdname, cmd, strerror(errno));
		goto err_system;
	}

	if (params->keydest) {
		destfd = mmap_fdt(params, params->keydest, &dest_blob, &sbuf);
		if (destfd < 0)
			goto err_keydest;
		destfd_size = sbuf.st_size;
	}

	tfd = mmap_fdt(params, tmpfile, &ptr, &sbuf);
	if (tfd < 0)
		goto err_mmap;

	/* set hashes for images in the blob */
	if (fit_add_verification_data(params->keydir,
				      dest_blob, ptr, params->comment,
				      params->require_keys)) {
		fprintf(stderr, "%s Can't add hashes to FIT blob\n",
			params->cmdname);
		goto err_add_hashes;
	}

	/* for first image creation, add a timestamp at offset 0 i.e., root  */
	if (params->datafile && fit_set_timestamp(ptr, 0, sbuf.st_mtime)) {
		fprintf (stderr, "%s: Can't add image timestamp\n",
				params->cmdname);
		goto err_add_timestamp;
	}
	debug ("Added timestamp successfully\n");

	munmap ((void *)ptr, sbuf.st_size);
	close (tfd);
	if (dest_blob) {
		munmap(dest_blob, destfd_size);
		close(destfd);
	}

	if (rename (tmpfile, params->imagefile) == -1) {
		fprintf (stderr, "%s: Can't rename %s to %s: %s\n",
				params->cmdname, tmpfile, params->imagefile,
				strerror (errno));
		unlink (tmpfile);
		unlink (params->imagefile);
		return (EXIT_FAILURE);
	}
	return (EXIT_SUCCESS);

err_add_timestamp:
err_add_hashes:
	munmap(ptr, sbuf.st_size);
err_mmap:
	if (dest_blob)
		munmap(dest_blob, destfd_size);
err_keydest:
err_system:
	unlink(tmpfile);
	return -1;
}

static int fit_check_params (struct mkimage_params *params)
{
	return	((params->dflag && (params->fflag || params->lflag)) ||
		(params->fflag && (params->dflag || params->lflag)) ||
		(params->lflag && (params->dflag || params->fflag)));
}

static struct image_type_params fitimage_params = {
	.name = "FIT Image support",
	.header_size = sizeof(image_header_t),
	.hdr = (void*)&header,
	.verify_header = fit_verify_header,
	.print_header = fit_print_contents,
	.check_image_type = fit_check_image_types,
	.fflag_handle = fit_handle_file,
	.set_header = NULL,	/* FIT images use DTB header */
	.check_params = fit_check_params,
};

void init_fit_image_type (void)
{
	mkimage_register (&fitimage_params);
}