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 */
PrintHelp(const char * progname)26 static void PrintHelp(const char *progname)
27 {
28 printf("\nUsage: " MYNAME " %s [--kloadaddr ADDRESS] "
29 "KERNEL_PARTITION\n\n", progname);
30 }
31
do_dump_kernel_config(int argc,char * argv[])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