diff options
| -rw-r--r-- | tools/firmware-utils/Makefile | 1 | ||||
| -rw-r--r-- | tools/firmware-utils/src/bcm4908img.c | 379 |
2 files changed, 380 insertions, 0 deletions
diff --git a/tools/firmware-utils/Makefile b/tools/firmware-utils/Makefile index a8c6ab4f65..055082593b 100644 --- a/tools/firmware-utils/Makefile +++ b/tools/firmware-utils/Makefile @@ -27,6 +27,7 @@ define Host/Compile $(call cc,add_header) $(call cc,addpattern) $(call cc,asustrx) + $(call cc,bcm4908img,-Wall) $(call cc,bcm4908kernel,-Wall) $(call cc,buffalo-enc buffalo-lib,-Wall) $(call cc,buffalo-tag buffalo-lib,-Wall) diff --git a/tools/firmware-utils/src/bcm4908img.c b/tools/firmware-utils/src/bcm4908img.c new file mode 100644 index 0000000000..86a187b146 --- /dev/null +++ b/tools/firmware-utils/src/bcm4908img.c @@ -0,0 +1,379 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Copyright (C) 2021 Rafał Miłecki <rafal@milecki.pl> + */ + +#include <byteswap.h> +#include <endian.h> +#include <errno.h> +#include <stdint.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <sys/stat.h> +#include <unistd.h> + +#if !defined(__BYTE_ORDER) +#error "Unknown byte order" +#endif + +#if __BYTE_ORDER == __BIG_ENDIAN +#define cpu_to_le32(x) bswap_32(x) +#define le32_to_cpu(x) bswap_32(x) +#elif __BYTE_ORDER == __LITTLE_ENDIAN +#define cpu_to_le32(x) (x) +#define le32_to_cpu(x) (x) +#else +#error "Unsupported endianness" +#endif + +struct bcm4908img_tail { + uint32_t crc32; + uint32_t unk1; + uint32_t family; + uint32_t unk2; + uint32_t unk3; +}; + +char *pathname; +static size_t prefix_len; +static size_t suffix_len; + +static inline size_t bcm4908img_min(size_t x, size_t y) { + return x < y ? x : y; +} + +/************************************************** + * CRC32 + **************************************************/ + +static const uint32_t crc32_tbl[] = { + 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, +}; + +uint32_t bcm4908img_crc32(uint32_t crc, uint8_t *buf, size_t len) { + while (len) { + crc = crc32_tbl[(crc ^ *buf) & 0xff] ^ (crc >> 8); + buf++; + len--; + } + + return crc; +} + +/************************************************** + * Check + **************************************************/ + +static void bcm4908img_check_parse_options(int argc, char **argv) { + int c; + + while ((c = getopt(argc, argv, "p:s:")) != -1) { + switch (c) { + case 'p': + prefix_len = atoi(optarg); + break; + case 's': + suffix_len = atoi(optarg); + break; + } + } +} + +static int bcm4908img_check(int argc, char **argv) { + struct bcm4908img_tail tail; + struct stat st; + uint8_t buf[1024]; + uint32_t crc32; + size_t length; + size_t bytes; + FILE *fp; + int err = 0; + + if (argc < 3) { + fprintf(stderr, "No BCM4908 image pathname passed\n"); + err = -EINVAL; + goto out; + } + pathname = argv[2]; + + optind = 3; + bcm4908img_check_parse_options(argc, argv); + + if (stat(pathname, &st)) { + fprintf(stderr, "Failed to stat %s\n", pathname); + err = -EIO; + goto out; + } + + fp = fopen(pathname, "r"); + if (!fp) { + fprintf(stderr, "Failed to open %s\n", pathname); + err = -EACCES; + goto out; + } + + fseek(fp, prefix_len, SEEK_SET); + + crc32 = 0xffffffff; + length = st.st_size - prefix_len - sizeof(tail) - suffix_len; + while (length && (bytes = fread(buf, 1, bcm4908img_min(sizeof(buf), length), fp)) > 0) { + crc32 = bcm4908img_crc32(crc32, buf, bytes); + length -= bytes; + } + + if (length) { + fprintf(stderr, "Failed to read last %zd B of data from %s\n", length, pathname); + err = -EIO; + goto err_close; + } + + if (fread(&tail, 1, sizeof(tail), fp) != sizeof(tail)) { + fprintf(stderr, "Failed to read BCM4908 image tail\n"); + err = -EIO; + goto err_close; + } + + if (crc32 != le32_to_cpu(tail.crc32)) { + fprintf(stderr, "Invalid data crc32: 0x%08x instead of 0x%08x\n", crc32, le32_to_cpu(tail.crc32)); + err = -EPROTO; + goto err_close; + } + + printf("Found a valid BCM4908 image (crc: 0x%08x)\n", crc32); + +err_close: + fclose(fp); +out: + return err; +} + +/************************************************** + * Create + **************************************************/ + +static ssize_t bcm4908img_create_append_file(FILE *trx, const char *in_path, uint32_t *crc32) { + FILE *in; + size_t bytes; + ssize_t length = 0; + uint8_t buf[1024]; + + in = fopen(in_path, "r"); + if (!in) { + fprintf(stderr, "Failed to open %s\n", in_path); + return -EACCES; + } + + while ((bytes = fread(buf, 1, sizeof(buf), in)) > 0) { + if (fwrite(buf, 1, bytes, trx) != bytes) { + fprintf(stderr, "Failed to write %zu B to %s\n", bytes, pathname); + length = -EIO; + break; + } + *crc32 = bcm4908img_crc32(*crc32, buf, bytes); + length += bytes; + } + + fclose(in); + + return length; +} + +static ssize_t bcm4908img_create_append_zeros(FILE *trx, size_t length) { + uint8_t *buf; + + buf = malloc(length); + if (!buf) + return -ENOMEM; + memset(buf, 0, length); + + if (fwrite(buf, 1, length, trx) != length) { + fprintf(stderr, "Failed to write %zu B to %s\n", length, pathname); + free(buf); + return -EIO; + } + + free(buf); + + return length; +} + +static ssize_t bcm4908img_create_align(FILE *trx, size_t cur_offset, size_t alignment) { + if (cur_offset & (alignment - 1)) { + size_t length = alignment - (cur_offset % alignment); + return bcm4908img_create_append_zeros(trx, length); + } + + return 0; +} + +static int bcm4908img_create(int argc, char **argv) { + struct bcm4908img_tail tail = { + .unk1 = cpu_to_le32(0x5732), + .family = cpu_to_le32(0x4908), + .unk2 = cpu_to_le32(0x03), + .unk3 = cpu_to_le32(0x02), + }; + uint32_t crc32 = 0xffffffff; + size_t cur_offset = 0; + ssize_t bytes; + FILE *fp; + int c; + int err = 0; + + if (argc < 3) { + fprintf(stderr, "No BCM4908 image pathname passed\n"); + err = -EINVAL; + goto out; + } + pathname = argv[2]; + + fp = fopen(pathname, "w+"); + if (!fp) { + fprintf(stderr, "Failed to open %s\n", pathname); + err = -EACCES; + goto out; + } + + optind = 3; + while ((c = getopt(argc, argv, "f:a:A:")) != -1) { + switch (c) { + case 'f': + bytes = bcm4908img_create_append_file(fp, optarg, &crc32); + if (bytes < 0) { + fprintf(stderr, "Failed to append file %s\n", optarg); + } else { + cur_offset += bytes; + } + break; + case 'a': + bytes = bcm4908img_create_align(fp, cur_offset, strtol(optarg, NULL, 0)); + if (bytes < 0) + fprintf(stderr, "Failed to append zeros\n"); + else + cur_offset += bytes; + break; + case 'A': + bytes = strtol(optarg, NULL, 0) - cur_offset; + if (bytes < 0) { + fprintf(stderr, "Current BCM4908 image length is 0x%zx, can't pad it with zeros to 0x%lx\n", cur_offset, strtol(optarg, NULL, 0)); + } else { + bytes = bcm4908img_create_append_zeros(fp, bytes); + if (bytes < 0) + fprintf(stderr, "Failed to append zeros\n"); + else + cur_offset += bytes; + } + break; + } + if (err) + goto err_close; + } + + tail.crc32 = cpu_to_le32(crc32); + + bytes = fwrite(&tail, 1, sizeof(tail), fp); + if (bytes != sizeof(tail)) { + fprintf(stderr, "Failed to write BCM4908 image tail to %s\n", pathname); + return -EIO; + } + +err_close: + fclose(fp); +out: + return err; +} + +/************************************************** + * Start + **************************************************/ + +static void usage() { + printf("Usage:\n"); + printf("\n"); + printf("Checking a BCM4908 image:\n"); + printf("\tbcm4908img check <file> [options]\tcheck if images is valid\n"); + printf("\t-p prefix\t\t\tlength of custom header to skip (default: 0)\n"); + printf("\t-s suffix\t\t\tlength of custom tail to skip (default: 0)\n"); + printf("\n"); + printf("Creating a new BCM4908 image:\n"); + printf("\tbcm4908img create <file> [options]\n"); + printf("\t-f file\t\t\t\tadd data from specified file\n"); + printf("\t-a alignment\t\t\tpad image with zeros to specified alignment\n"); + printf("\t-A offset\t\t\t\tappend zeros until reaching specified offset\n"); +} + +int main(int argc, char **argv) { + if (argc > 1) { + if (!strcmp(argv[1], "check")) + return bcm4908img_check(argc, argv); + else if (!strcmp(argv[1], "create")) + return bcm4908img_create(argc, argv); + } + + usage(); + return 0; +} |