35e0f6d290
bootloader_message.h currently divides /misc into four segments. The
space between 2K and 16K is reserved for vendor use (e.g. bootloader
persists flags). This CL adds a vendor tool "misc_writer", to allow
writing data to the vendor space in /misc, before getting a dedicated
HAL for accessing /misc partition (b/131775112).
Targets need to explicitly include the module, then invoke the
executable to write data. For example, the following command will write
3-byte data ("0xABCDEF") to offset 4 in vendor space (i.e. 2048 + 4 in
/misc).
$ /vendor/bin/misc_writer --vendor-space-offset 4 --hex-string 0xABCDEF
Bug: 132906936
Test: Run recovery_unit_test on crosshatch.
Test: Call the command via init.hardware.rc on crosshatch. Check that
the call finishes successfully. Then check the contents written to
/misc (`dd bs=1 skip=2048 if=/dev/block/sda2 count=32 | xxd`).
Change-Id: I79548fc63fc79b705a0320868690569c3106949f
Merged-In: I79548fc63fc79b705a0320868690569c3106949f
(cherry picked from commit 7ae0169842)
107 lines
3.2 KiB
C++
107 lines
3.2 KiB
C++
/*
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* Copyright (C) 2019 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <errno.h>
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#include <getopt.h>
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#include <stdint.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <iostream>
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#include <string>
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#include <string_view>
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#include <vector>
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#include <android-base/logging.h>
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#include <android-base/parseint.h>
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#include <bootloader_message/bootloader_message.h>
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using namespace std::string_literals;
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static std::vector<uint8_t> ParseHexString(std::string_view hex_string) {
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auto length = hex_string.size();
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if (length % 2 != 0 || length == 0) {
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return {};
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}
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std::vector<uint8_t> result(length / 2);
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for (size_t i = 0; i < length / 2; i++) {
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auto sub = "0x" + std::string(hex_string.substr(i * 2, 2));
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if (!android::base::ParseUint(sub, &result[i])) {
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return {};
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}
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}
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return result;
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}
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static int Usage(std::string_view name) {
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std::cerr << name << " usage:\n";
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std::cerr << name << " [--vendor-space-offset <offset>] --hex-string 0xABCDEF\n";
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std::cerr << "Writes the given hex string to the specified offset in vendor space in /misc "
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"partition. Offset defaults to 0 if unspecified.\n";
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return EXIT_FAILURE;
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}
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// misc_writer is a vendor tool that writes data to the vendor space in /misc.
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int main(int argc, char** argv) {
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constexpr struct option OPTIONS[] = {
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{ "vendor-space-offset", required_argument, nullptr, 0 },
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{ "hex-string", required_argument, nullptr, 0 },
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{ nullptr, 0, nullptr, 0 },
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};
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// Offset defaults to 0 if unspecified.
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size_t offset = 0;
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std::string_view hex_string;
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int arg;
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int option_index;
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while ((arg = getopt_long(argc, argv, "", OPTIONS, &option_index)) != -1) {
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if (arg != 0) {
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LOG(ERROR) << "Invalid command argument";
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return Usage(argv[0]);
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}
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auto option_name = OPTIONS[option_index].name;
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if (option_name == "vendor-space-offset"s) {
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if (!android::base::ParseUint(optarg, &offset)) {
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LOG(ERROR) << "Failed to parse the offset: " << optarg;
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return Usage(argv[0]);
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}
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} else if (option_name == "hex-string"s) {
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hex_string = optarg;
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}
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}
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if (hex_string.starts_with("0x") || hex_string.starts_with("0X")) {
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hex_string = hex_string.substr(2);
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}
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if (hex_string.empty()) {
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LOG(ERROR) << "Invalid input hex string: " << hex_string;
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return Usage(argv[0]);
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}
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auto data = ParseHexString(hex_string);
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if (data.empty()) {
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LOG(ERROR) << "Failed to parse the input hex string: " << hex_string;
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return EXIT_FAILURE;
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}
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if (std::string err; !WriteMiscPartitionVendorSpace(data.data(), data.size(), offset, &err)) {
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LOG(ERROR) << "Failed to write to misc partition: " << err;
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return EXIT_FAILURE;
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}
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return EXIT_SUCCESS;
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}
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