1 /* Copyright 2012 The ChromiumOS Authors
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 OPT_HELP,
19 };
20
21 static const struct option long_opts[] = {
22 {"kloadaddr", 1, NULL, OPT_KLOADADDR},
23 {"help", 0, 0, OPT_HELP},
24 {NULL, 0, NULL, 0}
25 };
26
27 /* Print help and return error */
print_help(int argc,char * argv[])28 static void print_help(int argc, char *argv[])
29 {
30 printf("\nUsage: " MYNAME " %s [--kloadaddr ADDRESS] "
31 "KERNEL_PARTITION\n\n", argv[0]);
32 }
33
do_dump_kern_cfg(int argc,char * argv[])34 static int do_dump_kern_cfg(int argc, char *argv[])
35 {
36 char *infile = NULL;
37 char *config = NULL;
38 uint64_t kernel_body_load_address = USE_PREAMBLE_LOAD_ADDR;
39 int parse_error = 0;
40 char *e;
41 int i;
42
43 while (((i = getopt_long(argc, argv, ":", long_opts, NULL)) != -1) &&
44 !parse_error) {
45 switch (i) {
46 default:
47 case '?':
48 /* Unhandled option */
49 parse_error = 1;
50 break;
51
52 case 0:
53 /* silently handled option */
54 break;
55
56 case OPT_KLOADADDR:
57 kernel_body_load_address = strtoul(optarg, &e, 0);
58 if (!*optarg || (e && *e)) {
59 ERROR("Invalid --kloadaddr\n");
60 parse_error = 1;
61 }
62 break;
63
64 case OPT_HELP:
65 print_help(argc, argv);
66 return 0;
67 }
68 }
69
70 if (optind >= argc) {
71 ERROR("Expected argument after options\n");
72 parse_error = 1;
73 } else
74 infile = argv[optind];
75
76 if (parse_error) {
77 print_help(argc, argv);
78 return 1;
79 }
80
81 if (!infile || !*infile) {
82 ERROR("Must specify filename\n");
83 return 1;
84 }
85
86 config = FindKernelConfig(infile, kernel_body_load_address);
87 if (!config)
88 return 1;
89
90 printf("%s", config);
91
92 free(config);
93 return 0;
94 }
95
96 DECLARE_FUTIL_COMMAND(dump_kernel_config, do_dump_kern_cfg, VBOOT_VERSION_ALL,
97 "Prints the kernel command line");
98