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author | Dominik Riebeling <Dominik.Riebeling@gmail.com> | 2021-12-15 21:04:28 +0100 |
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committer | Dominik Riebeling <Dominik.Riebeling@gmail.com> | 2021-12-24 18:05:53 +0100 |
commit | c876d3bbefe0dc00c27ca0c12d29da5874946962 (patch) | |
tree | 69f468a185a369b01998314bc3ecc19b70f4fcaa /utils/mktccboot/mktccboot.c | |
parent | 6c6f0757d7a902feb293be165d1490c42bc8e7ad (diff) | |
download | rockbox-c876d3bbefe0dc00c27ca0c12d29da5874946962.tar.gz rockbox-c876d3bbefe0dc00c27ca0c12d29da5874946962.zip |
rbutil: Merge rbutil with utils folder.
rbutil uses several components from the utils folder, and can be
considered part of utils too. Having it in a separate folder is an
arbitrary split that doesn't help anymore these days, so merge them.
This also allows other utils to easily use libtools.make without the
need to navigate to a different folder.
Change-Id: I3fc2f4de19e3e776553efb5dea5f779dfec0dc21
Diffstat (limited to 'utils/mktccboot/mktccboot.c')
-rw-r--r-- | utils/mktccboot/mktccboot.c | 176 |
1 files changed, 176 insertions, 0 deletions
diff --git a/utils/mktccboot/mktccboot.c b/utils/mktccboot/mktccboot.c new file mode 100644 index 0000000000..4f2c3258db --- /dev/null +++ b/utils/mktccboot/mktccboot.c | |||
@@ -0,0 +1,176 @@ | |||
1 | /*************************************************************************** | ||
2 | * __________ __ ___. | ||
3 | * Open \______ \ ____ ____ | | _\_ |__ _______ ___ | ||
4 | * Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ / | ||
5 | * Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < < | ||
6 | * Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \ | ||
7 | * \/ \/ \/ \/ \/ | ||
8 | * $Id$ | ||
9 | * | ||
10 | * Copyright (C) 2007 by Dave Chapman | ||
11 | * | ||
12 | * Based on mkboot, Copyright (C) 2005 by Linus Nielsen Feltzing | ||
13 | * | ||
14 | * This program is free software; you can redistribute it and/or | ||
15 | * modify it under the terms of the GNU General Public License | ||
16 | * as published by the Free Software Foundation; either version 2 | ||
17 | * of the License, or (at your option) any later version. | ||
18 | * | ||
19 | * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY | ||
20 | * KIND, either express or implied. | ||
21 | * | ||
22 | ****************************************************************************/ | ||
23 | #include <stdio.h> | ||
24 | #include <stdlib.h> | ||
25 | #include <string.h> | ||
26 | #include <unistd.h> | ||
27 | #include <sys/types.h> | ||
28 | #include <sys/stat.h> | ||
29 | #include <fcntl.h> | ||
30 | #include <inttypes.h> | ||
31 | #include "mktccboot.h" | ||
32 | #include "telechips.h" | ||
33 | |||
34 | /* | ||
35 | |||
36 | Append a Rockbox bootloader to a Telechips original firmware file. | ||
37 | |||
38 | The first instruction in a TCC firmware file is always of the form: | ||
39 | |||
40 | ldr pc, [pc, #xxx] | ||
41 | |||
42 | where [pc, #xxx] is the entry point of the firmware - e.g. 0x20000020 | ||
43 | |||
44 | mktccboot appends the Rockbox bootloader to the end of the original | ||
45 | firmware image and replaces the contents of [pc, #xxx] with the entry | ||
46 | point of our bootloader - i.e. the length of the original firmware plus | ||
47 | 0x20000000. | ||
48 | |||
49 | It then stores the original entry point from [pc, #xxx] in a fixed | ||
50 | offset in the Rockbox boootloader, which is used by the bootloader to | ||
51 | dual-boot. | ||
52 | |||
53 | Finally, mktccboot corrects the length and CRCs in the main firmware | ||
54 | header, creating a new legal firmware file which can be installed on | ||
55 | the device. | ||
56 | |||
57 | */ | ||
58 | |||
59 | /* win32 compatibility */ | ||
60 | |||
61 | #ifndef O_BINARY | ||
62 | #define O_BINARY 0 | ||
63 | #endif | ||
64 | |||
65 | static void put_uint32le(uint32_t x, unsigned char* p) | ||
66 | { | ||
67 | p[0] = x & 0xff; | ||
68 | p[1] = (x >> 8) & 0xff; | ||
69 | p[2] = (x >> 16) & 0xff; | ||
70 | p[3] = (x >> 24) & 0xff; | ||
71 | } | ||
72 | |||
73 | static uint32_t get_uint32le(unsigned char* p) | ||
74 | { | ||
75 | return (p[3] << 24) | (p[2] << 16) | (p[1]<<8) | p[0]; | ||
76 | } | ||
77 | |||
78 | static off_t filesize(int fd) { | ||
79 | struct stat buf; | ||
80 | |||
81 | if (fstat(fd,&buf) < 0) { | ||
82 | perror("[ERR] Checking filesize of input file"); | ||
83 | return -1; | ||
84 | } else { | ||
85 | return(buf.st_size); | ||
86 | } | ||
87 | } | ||
88 | |||
89 | #define DRAMORIG 0x20000000 | ||
90 | /* Injects a bootloader into a Telechips 77X/78X firmware file */ | ||
91 | unsigned char *patch_firmware_tcc(unsigned char *of_buf, int of_size, | ||
92 | unsigned char *boot_buf, int boot_size, int *patched_size) | ||
93 | { | ||
94 | unsigned char *patched_buf; | ||
95 | uint32_t ldr, old_ep_offset, new_ep_offset; | ||
96 | int of_offset; | ||
97 | |||
98 | patched_buf = malloc(of_size + boot_size); | ||
99 | if (!patched_buf) | ||
100 | return NULL; | ||
101 | |||
102 | memcpy(patched_buf, of_buf, of_size); | ||
103 | memcpy(patched_buf + of_size, boot_buf, boot_size); | ||
104 | |||
105 | ldr = get_uint32le(patched_buf); | ||
106 | |||
107 | /* TODO: Verify it's a LDR instruction */ | ||
108 | of_offset = (ldr & 0xfff) + 8; | ||
109 | old_ep_offset = get_uint32le(patched_buf + of_offset); | ||
110 | new_ep_offset = DRAMORIG + of_size; | ||
111 | |||
112 | printf("OF entry point: 0x%08x\n", old_ep_offset); | ||
113 | printf("New entry point: 0x%08x\n", new_ep_offset + 8); | ||
114 | |||
115 | /* Save the OF entry point at the start of the bootloader image */ | ||
116 | put_uint32le(old_ep_offset, patched_buf + of_size); | ||
117 | put_uint32le(new_ep_offset, patched_buf + of_size + 4); | ||
118 | |||
119 | /* Change the OF entry point to the third word in our bootloader */ | ||
120 | put_uint32le(new_ep_offset + 8, patched_buf + of_offset); | ||
121 | |||
122 | telechips_encode_crc(patched_buf, of_size + boot_size); | ||
123 | *patched_size = of_size + boot_size; | ||
124 | |||
125 | return patched_buf; | ||
126 | } | ||
127 | |||
128 | unsigned char *file_read(char *filename, int *size) | ||
129 | { | ||
130 | unsigned char *buf = NULL; | ||
131 | int n, fd = -1; | ||
132 | |||
133 | /* Open file for reading */ | ||
134 | fd = open(filename, O_RDONLY|O_BINARY); | ||
135 | if (fd < 0) | ||
136 | { | ||
137 | printf("[ERR] Could open file for reading, aborting\n"); | ||
138 | perror(filename); | ||
139 | goto error; | ||
140 | } | ||
141 | |||
142 | /* Get file size, and allocate a buffer of that size */ | ||
143 | *size = filesize(fd); | ||
144 | buf = malloc(*size); | ||
145 | if (buf == NULL) | ||
146 | { | ||
147 | printf("[ERR] Could not allocate memory, aborting\n"); | ||
148 | goto error; | ||
149 | } | ||
150 | |||
151 | /* Read the file's content to the buffer */ | ||
152 | n = read(fd, buf, *size); | ||
153 | if (n != *size) | ||
154 | { | ||
155 | printf("[ERR] Could not read from %s\n", filename); | ||
156 | goto error; | ||
157 | } | ||
158 | |||
159 | return buf; | ||
160 | |||
161 | error: | ||
162 | if (fd >= 0) | ||
163 | close(fd); | ||
164 | |||
165 | if (buf) | ||
166 | free(buf); | ||
167 | |||
168 | return NULL; | ||
169 | } | ||
170 | |||
171 | /* A CRC test in order to reject non OF file */ | ||
172 | int test_firmware_tcc(unsigned char* buf, int length) | ||
173 | { | ||
174 | return telechips_test_crc(buf, length); | ||
175 | } | ||
176 | |||