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779796f57e
This provides help messages for the futility commands similar to the way git does. These show the available commands: futility futility help futility --help While these show help for a specific command: futility help COMMAND futility --help COMMAND futility COMMAND --help BUG=none BRANCH=ToT TEST=manual make runtests And manually look at help messages for each command. Change-Id: I1126471e242784c6ca7a2f11694fa7c505d833e8 Signed-off-by: Bill Richardson <wfrichar@chromium.org> Reviewed-on: https://chromium-review.googlesource.com/219528 Reviewed-by: Randall Spangler <rspangler@chromium.org>
123 lines
2.9 KiB
C
123 lines
2.9 KiB
C
/* Copyright 2012 The Chromium OS Authors. All rights reserved.
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*
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* Exports the kernel commandline from a given partition/image.
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*/
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#include <stdio.h>
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#include <string.h>
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#include <sys/mman.h>
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#include "host_common.h"
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#include "kernel_blob.h"
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#include "vboot_api.h"
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#include "vboot_host.h"
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static uint8_t *GetKernelConfig(uint8_t *blob, size_t blob_size,
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uint64_t kernel_body_load_address)
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{
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VbKeyBlockHeader *key_block;
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VbKernelPreambleHeader *preamble;
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uint32_t now = 0;
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uint32_t offset = 0;
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/* Skip the key block */
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key_block = (VbKeyBlockHeader *) blob;
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now += key_block->key_block_size;
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if (now + blob > blob + blob_size) {
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VbExError("key_block_size advances past the end of the blob\n");
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return NULL;
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}
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/* Open up the preamble */
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preamble = (VbKernelPreambleHeader *) (blob + now);
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now += preamble->preamble_size;
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if (now + blob > blob + blob_size) {
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VbExError("preamble_size advances past the end of the blob\n");
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return NULL;
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}
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/* Read body_load_address from preamble if no
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* kernel_body_load_address */
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if (kernel_body_load_address == USE_PREAMBLE_LOAD_ADDR)
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kernel_body_load_address = preamble->body_load_address;
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/* The x86 kernels have a pointer to the kernel commandline in the
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* zeropage table, but that's irrelevant for ARM. Both types keep the
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* config blob in the same place, so just go find it. */
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offset = preamble->bootloader_address -
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(kernel_body_load_address + CROS_PARAMS_SIZE +
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CROS_CONFIG_SIZE) + now;
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if (offset > blob_size) {
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VbExError("params are outside of the memory blob: %x\n",
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offset);
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return NULL;
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}
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return blob + offset;
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}
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static void *MMapFile(const char *filename, size_t *size)
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{
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FILE *f;
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uint8_t *buf;
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long file_size = 0;
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f = fopen(filename, "rb");
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if (!f) {
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VBDEBUG(("Unable to open file %s\n", filename));
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return NULL;
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}
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fseek(f, 0, SEEK_END);
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file_size = ftell(f);
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rewind(f);
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if (file_size <= 0) {
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fclose(f);
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return NULL;
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}
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*size = (size_t) file_size;
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/* Uses a host primitive as this is not meant for firmware use. */
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buf = mmap(NULL, *size, PROT_READ, MAP_PRIVATE, fileno(f), 0);
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if (buf == MAP_FAILED) {
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VbExError("Failed to mmap the file %s\n", filename);
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fclose(f);
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return NULL;
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}
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fclose(f);
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return buf;
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}
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char *FindKernelConfig(const char *infile, uint64_t kernel_body_load_address)
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{
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uint8_t *blob;
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size_t blob_size;
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uint8_t *config = NULL;
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char *newstr = NULL;
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blob = MMapFile(infile, &blob_size);
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if (!blob) {
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VbExError("Error reading input file\n");
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return 0;
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}
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config = GetKernelConfig(blob, blob_size, kernel_body_load_address);
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if (!config) {
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VbExError("Error parsing input file\n");
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munmap(blob, blob_size);
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return 0;
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}
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newstr = strndup((char *)config, CROS_CONFIG_SIZE);
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if (!newstr)
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VbExError("Can't allocate new string\n");
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munmap(blob, blob_size);
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return newstr;
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}
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