1 /* Copyright 2012 The Chromium OS Authors. All rights reserved. 2 * Use of this source code is governed by a BSD-style license that can be 3 * found in the LICENSE file. 4 * 5 * Exports the kernel commandline from a given partition/image. 6 */ 7 8 #include <getopt.h> 9 #include <stdio.h> 10 #include <sys/mman.h> 11 #include <unistd.h> 12 13 #include "futility.h" 14 #include "vboot_host.h" 15 16 enum { 17 OPT_KLOADADDR = 1000, 18 }; 19 20 static const struct option long_opts[] = { 21 {"kloadaddr", 1, NULL, OPT_KLOADADDR}, 22 {NULL, 0, NULL, 0} 23 }; 24 25 /* Print help and return error */ 26 static void PrintHelp(const char *progname) 27 { 28 printf("\nUsage: " MYNAME " %s [--kloadaddr ADDRESS] " 29 "KERNEL_PARTITION\n\n", progname); 30 } 31 32 static int do_dump_kernel_config(int argc, char *argv[]) 33 { 34 char *infile = NULL; 35 char *config = NULL; 36 uint64_t kernel_body_load_address = USE_PREAMBLE_LOAD_ADDR; 37 int parse_error = 0; 38 char *e; 39 int i; 40 41 while (((i = getopt_long(argc, argv, ":", long_opts, NULL)) != -1) && 42 !parse_error) { 43 switch (i) { 44 default: 45 case '?': 46 /* Unhandled option */ 47 parse_error = 1; 48 break; 49 50 case 0: 51 /* silently handled option */ 52 break; 53 54 case OPT_KLOADADDR: 55 kernel_body_load_address = strtoul(optarg, &e, 0); 56 if (!*optarg || (e && *e)) { 57 fprintf(stderr, "Invalid --kloadaddr\n"); 58 parse_error = 1; 59 } 60 break; 61 } 62 } 63 64 if (optind >= argc) { 65 fprintf(stderr, "Expected argument after options\n"); 66 parse_error = 1; 67 } else 68 infile = argv[optind]; 69 70 if (parse_error) { 71 PrintHelp(argv[0]); 72 return 1; 73 } 74 75 if (!infile || !*infile) { 76 fprintf(stderr, "Must specify filename\n"); 77 return 1; 78 } 79 80 config = FindKernelConfig(infile, kernel_body_load_address); 81 if (!config) 82 return 1; 83 84 printf("%s", config); 85 86 free(config); 87 return 0; 88 } 89 90 DECLARE_FUTIL_COMMAND(dump_kernel_config, do_dump_kernel_config, 91 VBOOT_VERSION_ALL, 92 "Prints the kernel command line", 93 PrintHelp); 94
