1 /*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License, Version 1.0 only
6 * (the "License"). You may not use this file except in compliance
7 * with the License.
8 *
9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
10 * or http://www.opensolaris.org/os/licensing.
11 * See the License for the specific language governing permissions
12 * and limitations under the License.
13 *
14 * When distributing Covered Code, include this CDDL HEADER in each
15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
16 * If applicable, add the following below this CDDL HEADER, with the
17 * fields enclosed by brackets "[]" replaced with your own identifying
18 * information: Portions Copyright [yyyy] [name of copyright owner]
19 *
20 * CDDL HEADER END
21 */
22 /*
23 * Copyright 2004 Sun Microsystems, Inc. All rights reserved.
24 * Use is subject to license terms.
25 */
26
27 #pragma ident "%Z%%M% %I% %E% SMI"
28
29 /*
30 * Set bits in the DT_FLAGS_1 member of the .dynamic section of an object.
31 */
32
33 #include <stdio.h>
34 #include <stdlib.h>
35 #include <stdarg.h>
36 #include <errno.h>
37 #include <libelf.h>
38 #include <gelf.h>
39 #include <string.h>
40 #include <fcntl.h>
41 #include <libgen.h>
42 #include <unistd.h>
43 #include <sys/types.h>
44 #include <sys/stat.h>
45 #include <sys/link.h>
46
47 #include <util.h>
48
49 /*
50 * These are here because we can't be sure (yet) that the build machine has a
51 * sys/link.h that includes the following #defines. This tool will be executed
52 * on the build machine, so we have to use its headers (rather than the ones
53 * in $ROOT which will, by definition, be up to date). These #defines can be
54 * removed when we're sure that all build machines have recent copies of
55 * sys/link.h.
56 */
57 #ifndef DF_1_IGNMULDEF
58 #define DF_1_IGNMULDEF 0x00040000
59 #endif
60 #ifndef DF_1_NOKSYMS
61 #define DF_1_NOKSYMS 0x00080000
62 #endif
63
64 struct dtflagval {
65 char *fv_name;
66 ulong_t fv_val;
67 };
68
69 static struct dtflagval dtflagvals[] = {
70 { "DF_1_IGNMULDEF", DF_1_IGNMULDEF },
71 { "DF_1_NOKSYMS", DF_1_NOKSYMS },
72 { NULL }
73 };
74
75 const char *progname;
76
77 static void
usage(void)78 usage(void)
79 {
80 (void) fprintf(stderr, "Usage: %s -f flag_val file\n", progname);
81 exit(2);
82 }
83
84 static void
set_flag(char * ifile,ulong_t flval)85 set_flag(char *ifile, ulong_t flval)
86 {
87 Elf *elf;
88 Elf_Scn *scn;
89 Elf_Data *data;
90 GElf_Shdr shdr;
91 GElf_Dyn dyn;
92 int fd, secidx, nent, i;
93
94 (void) elf_version(EV_CURRENT);
95
96 if ((fd = open(ifile, O_RDWR)) < 0)
97 die("Can't open %s", ifile);
98
99 if ((elf = elf_begin(fd, ELF_C_RDWR, NULL)) == NULL)
100 elfdie("Can't start ELF for %s", ifile);
101
102 if ((secidx = findelfsecidx(elf, ".dynamic")) == -1)
103 die("Can't find .dynamic section in %s\n", ifile);
104
105 if ((scn = elf_getscn(elf, secidx)) == NULL)
106 elfdie("elf_getscn (%d)", secidx);
107
108 if (gelf_getshdr(scn, &shdr) == NULL)
109 elfdie("gelf_shdr");
110
111 if ((data = elf_getdata(scn, NULL)) == NULL)
112 elfdie("elf_getdata");
113
114 nent = shdr.sh_size / shdr.sh_entsize;
115 for (i = 0; i < nent; i++) {
116 if (gelf_getdyn(data, i, &dyn) == NULL)
117 elfdie("gelf_getdyn");
118
119 if (dyn.d_tag == DT_FLAGS_1) {
120 dyn.d_un.d_val |= (Elf64_Xword)flval;
121
122 if (gelf_update_dyn(data, i, &dyn) == 0)
123 elfdie("gelf_update_dyn");
124
125 break;
126 }
127 }
128
129 if (i == nent) {
130 die("%s's .dynamic section doesn't have a DT_FLAGS_1 "
131 "field\n", ifile);
132 }
133
134 if (elf_update(elf, ELF_C_WRITE) == -1)
135 elfdie("Couldn't update %s with changes", ifile);
136
137 (void) elf_end(elf);
138 (void) close(fd);
139 }
140
141 static ulong_t
parse_flag(char * optarg)142 parse_flag(char *optarg)
143 {
144 ulong_t flval = 0L;
145 char *arg;
146 int i;
147
148 for (arg = strtok(optarg, ","); arg != NULL; arg = strtok(NULL, ",")) {
149 for (i = 0; dtflagvals[i].fv_name != NULL; i++) {
150 if (strcmp(dtflagvals[i].fv_name, arg) == 0)
151 flval |= dtflagvals[i].fv_val;
152 }
153 }
154
155 return (flval);
156 }
157
158 int
main(int argc,char ** argv)159 main(int argc, char **argv)
160 {
161 ulong_t flval = 0L;
162 int c;
163
164 progname = basename(argv[0]);
165
166 while ((c = getopt(argc, argv, "f:")) != EOF) {
167 switch (c) {
168 case 'f':
169 if ((flval = strtoul(optarg, NULL, 0)) == 0 &&
170 (flval = parse_flag(optarg)) == 0)
171 usage();
172 break;
173 default:
174 usage();
175 }
176 }
177
178 if (flval == 0 || argc - optind != 1)
179 usage();
180
181 set_flag(argv[optind], flval);
182
183 return (0);
184 }
185