1 /*
2 * Copyright (C) 2019 The Android Open Source Project
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * * Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * * Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in
12 * the documentation and/or other materials provided with the
13 * distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
16 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
17 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
18 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
19 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
21 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
22 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
23 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
24 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
25 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29 #include "linker_debug.h"
30
31 #include <unistd.h>
32
33 #include <android-base/strings.h>
34
35 LinkerDebugConfig g_linker_debug_config;
36
init_LD_DEBUG(const std::string & value)37 void init_LD_DEBUG(const std::string& value) {
38 if (value.empty()) return;
39 std::vector<std::string> options = android::base::Split(value, ",");
40 for (const auto& o : options) {
41 if (o == "calls") g_linker_debug_config.calls = true;
42 else if (o == "cfi") g_linker_debug_config.cfi = true;
43 else if (o == "dynamic") g_linker_debug_config.dynamic = true;
44 else if (o == "lookup") g_linker_debug_config.lookup = true;
45 else if (o == "props") g_linker_debug_config.props = true;
46 else if (o == "reloc") g_linker_debug_config.reloc = true;
47 else if (o == "statistics") g_linker_debug_config.statistics = true;
48 else if (o == "timing") g_linker_debug_config.timing = true;
49 else if (o == "all") {
50 g_linker_debug_config.calls = true;
51 g_linker_debug_config.cfi = true;
52 g_linker_debug_config.dynamic = true;
53 g_linker_debug_config.lookup = true;
54 g_linker_debug_config.props = true;
55 g_linker_debug_config.reloc = true;
56 g_linker_debug_config.statistics = true;
57 g_linker_debug_config.timing = true;
58 } else {
59 __linker_error("$LD_DEBUG is a comma-separated list of:\n"
60 "\n"
61 " calls ctors/dtors/ifuncs\n"
62 " cfi control flow integrity messages\n"
63 " dynamic dynamic section processing\n"
64 " lookup symbol lookup\n"
65 " props ELF property processing\n"
66 " reloc relocation resolution\n"
67 " statistics relocation statistics\n"
68 " timing timing information\n"
69 "\n"
70 "or 'all' for all of the above.\n");
71 }
72 }
73 if (g_linker_debug_config.calls || g_linker_debug_config.cfi ||
74 g_linker_debug_config.dynamic || g_linker_debug_config.lookup ||
75 g_linker_debug_config.props || g_linker_debug_config.reloc ||
76 g_linker_debug_config.statistics || g_linker_debug_config.timing) {
77 g_linker_debug_config.any = true;
78 }
79 }
80
linker_log_va_list(int prio,const char * fmt,va_list ap)81 static void linker_log_va_list(int prio, const char* fmt, va_list ap) {
82 va_list ap2;
83 va_copy(ap2, ap);
84 async_safe_format_log_va_list(prio, "linker", fmt, ap2);
85 va_end(ap2);
86
87 async_safe_format_fd_va_list(STDERR_FILENO, fmt, ap);
88 write(STDERR_FILENO, "\n", 1);
89 }
90
__linker_log(int prio,const char * fmt,...)91 void __linker_log(int prio, const char* fmt, ...) {
92 va_list ap;
93 va_start(ap, fmt);
94 linker_log_va_list(prio, fmt, ap);
95 va_end(ap);
96 }
97
__linker_error(const char * fmt,...)98 void __linker_error(const char* fmt, ...) {
99 va_list ap;
100 va_start(ap, fmt);
101 linker_log_va_list(ANDROID_LOG_FATAL, fmt, ap);
102 va_end(ap);
103
104 _exit(EXIT_FAILURE);
105 }
106