From 2440fd85c9fea1ee427e7cb2bc7214e7dbe310b1 Mon Sep 17 00:00:00 2001 From: Simon Shields Date: Mon, 29 Jan 2018 13:17:08 +1100 Subject: [PATCH] dtbhtool: implement unpackdtbhimg Parses a DTBH image and outputs the information needed for samsung_dtb.h and dumps all DTBs contained in the file. Change-Id: Ia724f25c3b33423baeefec85c9b0d42967fce6f2 (cherry picked from commit 25b3f58c5bb9e9cfd2f0282047a2ea13141496cc) --- dtbhtool/Android.mk | 5 ++ dtbhtool/unpackdtbhimg.c | 185 +++++++++++++++++++++++++++++++++++++++ 2 files changed, 190 insertions(+) create mode 100644 dtbhtool/unpackdtbhimg.c diff --git a/dtbhtool/Android.mk b/dtbhtool/Android.mk index f8aeae6..6992700 100644 --- a/dtbhtool/Android.mk +++ b/dtbhtool/Android.mk @@ -61,4 +61,9 @@ LOCAL_MODULE_PATH := $(PRODUCT_OUT)/utilities LOCAL_FORCE_STATIC_EXECUTABLE := true include $(BUILD_EXECUTABLE) +include $(CLEAR_VARS) +LOCAL_SRC_FILES := unpackdtbhimg.c +LOCAL_MODULE := unpackdtbhimg +include $(BUILD_HOST_EXECUTABLE) + $(call dist-for-goals,dist_files,$(LOCAL_BUILT_MODULE)) diff --git a/dtbhtool/unpackdtbhimg.c b/dtbhtool/unpackdtbhimg.c new file mode 100644 index 0000000..0cdbabd --- /dev/null +++ b/dtbhtool/unpackdtbhimg.c @@ -0,0 +1,185 @@ +/* + * Copyright 2018, The LineageOS Project + * + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#define DEFAULT_PAGE_SIZE 2048 +#define DT_NAME_LEN 64 + +struct dt_entry { + uint32_t chip; + uint32_t platform; + uint32_t subtype; + uint32_t hw_rev; + uint32_t hw_rev_end; + uint32_t offset; + uint32_t size; /* including padding */ + uint32_t space; +}; + +struct dtbh_header { + uint32_t magic; + uint32_t version; + uint32_t entry_count; + + struct dt_entry entries[]; +}; + +static void show_dt_entry(struct dt_entry *ent) { + printf("chip: %u, platform: 0x%x, subtype: 0x%x, hw_rev: %u, hw_rev_end: %u, offset: %u, " + "size: %u, space: %u\n", ent->chip, ent->platform, ent->subtype, ent->hw_rev, + ent->hw_rev_end, ent->offset, ent->size, ent->space); +} + +static void dump_dtb(void *buffer, uint32_t size, char *dest) +{ + FILE *output; + ssize_t len; + + output = fopen(dest, "wb"); + if (output == NULL) { + fprintf(stderr, "error: could not open %s\n", dest); + return; + } + + len = fwrite(buffer, size, 1, output); + fclose(output); + + if (len < 0) { + printf("error: failed to write %s (%s)\n", dest, strerror(errno)); + return; + } + + printf("Successfully dumped %s (size=%zu)\n", dest, size); +} + +int usage(void) +{ + fprintf(stderr,"usage: unpackdtbhimg\n" + " -i|--input \n" + " -o|--output \n" + " -p|--pagesize \n" + ); + return 1; +} + +int main(int argc, char *argv[]) { + char *dtbhimg = 0; + char *output_dir = 0; + FILE *dtbhimg_fp; + ssize_t len; + int page_size = DEFAULT_PAGE_SIZE; + struct dtbh_header *header; + void *dt_blob; + + argc--; + argv++; + + while (argc > 0){ + char *arg = argv[0]; + char *val = argv[1]; + if (argc < 1) { + return usage(); + } + argc -= 2; + argv += 2; + if (!strcmp(arg, "--input") || !strcmp(arg, "-i")) { + dtbhimg = val; + } else if (!strcmp(arg, "--output") || !strcmp(arg, "-o")) { + output_dir = val; + } else if (!strcmp(arg, "--pagesize") || !strcmp(arg, "-p")) { + page_size = atoi(val); + } + } + + if (dtbhimg == 0) { + fprintf(stderr,"error: no input filename specified\n"); + return usage(); + } + + if (output_dir == 0) { + fprintf(stderr,"error: no output path specified\n"); + return usage(); + } + + printf("using page_size: %d\n", page_size); + + dtbhimg_fp = fopen(dtbhimg, "r"); + if (dtbhimg_fp == NULL) { + fprintf(stderr, "error: could not open %s\n", dtbhimg); + goto err_open; + } + + header = calloc(page_size, 1); + if (header == NULL) { + goto err_calloc; + } + + len = fread(header, page_size, 1, dtbhimg_fp); + if (len != 1) { + fprintf(stderr, "Failed to read DTBH header: %s\n", strerror(errno)); + goto err_read; + } + + printf("DTBH_MAGIC = '%.4s'\n", &header->magic); + printf("DTBH_VERSION = %u\n", header->version); + printf("Number of entries: %u\n", header->entry_count); + + for (uint32_t i = 0; i < header->entry_count; i++) { + printf("DTB %d: ", i); + show_dt_entry(&header->entries[i]); + dt_blob = malloc(header->entries[i].size); + if (fseek(dtbhimg_fp, header->entries[i].offset, SEEK_SET) != 0) { + fprintf(stderr, "failed to set offset to 0x%x: %s\n", header->entries[i].offset, + strerror(errno)); + goto err_loop; + } + len = fread(dt_blob, header->entries[i].size, 1, dtbhimg_fp); + if (len != 1) { + fprintf(stderr, "Failed to read DTB: %s\n", strerror(errno)); + } + + size_t dest_file_len = DT_NAME_LEN + strlen(output_dir); + char dest_file[dest_file_len]; + snprintf(dest_file, dest_file_len, "%s/chip%u-0x%x-0x%x_rev%u-%u.dtb", output_dir, + header->entries[i].chip, header->entries[i].platform, header->entries[i].subtype, + header->entries[i].hw_rev, header->entries[i].hw_rev_end); + dump_dtb(dt_blob, header->entries[i].size, dest_file); + free(dt_blob); + } + + free(header); + fclose(dtbhimg_fp); + + return 0; + +err_loop: + free(dt_blob); +err_read: + free(header); +err_calloc: + fclose(dtbhimg_fp); +err_open: + return 1; +} -- 2.20.1