1 /* Copyright (c) 2014, Google Inc.
2 *
3 * Permission to use, copy, modify, and/or distribute this software for any
4 * purpose with or without fee is hereby granted, provided that the above
5 * copyright notice and this permission notice appear in all copies.
6 *
7 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
8 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
9 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
10 * SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
11 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
12 * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
13 * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */
14
15 #include <openssl/crypto.h>
16
17 #include <openssl/cpu.h>
18
19 #include "internal.h"
20
21
22 #if !defined(OPENSSL_NO_ASM) && !defined(OPENSSL_STATIC_ARMCAP) && \
23 (defined(OPENSSL_X86) || defined(OPENSSL_X86_64) || \
24 defined(OPENSSL_ARM) || defined(OPENSSL_AARCH64))
25 /* x86, x86_64 and the ARMs need to record the result of a cpuid call for the
26 * asm to work correctly, unless compiled without asm code. */
27 #define NEED_CPUID
28
29 #else
30
31 /* Otherwise, don't emit a static initialiser. */
32
33 #if !defined(BORINGSSL_NO_STATIC_INITIALIZER)
34 #define BORINGSSL_NO_STATIC_INITIALIZER
35 #endif
36
37 #endif /* !OPENSSL_NO_ASM && (OPENSSL_X86 || OPENSSL_X86_64 ||
38 OPENSSL_ARM || OPENSSL_AARCH64) */
39
40
41 /* The capability variables are defined in this file in order to work around a
42 * linker bug. When linking with a .a, if no symbols in a .o are referenced
43 * then the .o is discarded, even if it has constructor functions.
44 *
45 * This still means that any binaries that don't include some functionality
46 * that tests the capability values will still skip the constructor but, so
47 * far, the init constructor function only sets the capability variables. */
48
49 #if defined(OPENSSL_X86) || defined(OPENSSL_X86_64)
50 /* This value must be explicitly initialised to zero in order to work around a
51 * bug in libtool or the linker on OS X.
52 *
53 * If not initialised then it becomes a "common symbol". When put into an
54 * archive, linking on OS X will fail to resolve common symbols. By
55 * initialising it to zero, it becomes a "data symbol", which isn't so
56 * affected. */
57 uint32_t OPENSSL_ia32cap_P[4] = {0};
58 #elif defined(OPENSSL_ARM) || defined(OPENSSL_AARCH64)
59
60 #include <openssl/arm_arch.h>
61
62 #if defined(OPENSSL_STATIC_ARMCAP)
63
64 uint32_t OPENSSL_armcap_P =
65 #if defined(OPENSSL_STATIC_ARMCAP_NEON) || defined(__ARM_NEON__)
66 ARMV7_NEON | ARMV7_NEON_FUNCTIONAL |
67 #endif
68 #if defined(OPENSSL_STATIC_ARMCAP_AES)
69 ARMV8_AES |
70 #endif
71 #if defined(OPENSSL_STATIC_ARMCAP_SHA1)
72 ARMV8_SHA1 |
73 #endif
74 #if defined(OPENSSL_STATIC_ARMCAP_SHA256)
75 ARMV8_SHA256 |
76 #endif
77 #if defined(OPENSSL_STATIC_ARMCAP_PMULL)
78 ARMV8_PMULL |
79 #endif
80 0;
81
82 #elif defined(__ARM_NEON__)
83 uint32_t OPENSSL_armcap_P = ARMV7_NEON | ARMV7_NEON_FUNCTIONAL;
84 #else
85 uint32_t OPENSSL_armcap_P = ARMV7_NEON_FUNCTIONAL;
86 #endif
87
88 #endif
89
90
91 #if defined(OPENSSL_WINDOWS) && !defined(BORINGSSL_NO_STATIC_INITIALIZER)
92 #define OPENSSL_CDECL __cdecl
93 #else
94 #define OPENSSL_CDECL
95 #endif
96
97 #if defined(BORINGSSL_NO_STATIC_INITIALIZER)
98 static CRYPTO_once_t once = CRYPTO_ONCE_INIT;
99 #elif defined(OPENSSL_WINDOWS)
100 #pragma section(".CRT$XCU", read)
101 static void __cdecl do_library_init(void);
102 __declspec(allocate(".CRT$XCU")) void(*library_init_constructor)(void) =
103 do_library_init;
104 #else
105 static void do_library_init(void) __attribute__ ((constructor));
106 #endif
107
108 /* do_library_init is the actual initialization function. If
109 * BORINGSSL_NO_STATIC_INITIALIZER isn't defined, this is set as a static
110 * initializer. Otherwise, it is called by CRYPTO_library_init. */
do_library_init(void)111 static void OPENSSL_CDECL do_library_init(void) {
112 /* WARNING: this function may only configure the capability variables. See the
113 * note above about the linker bug. */
114 #if defined(NEED_CPUID)
115 OPENSSL_cpuid_setup();
116 #endif
117 }
118
CRYPTO_library_init(void)119 void CRYPTO_library_init(void) {
120 /* TODO(davidben): It would be tidier if this build knob could be replaced
121 * with an internal lazy-init mechanism that would handle things correctly
122 * in-library. https://crbug.com/542879 */
123 #if defined(BORINGSSL_NO_STATIC_INITIALIZER)
124 CRYPTO_once(&once, do_library_init);
125 #endif
126 }
127
SSLeay_version(int unused)128 const char *SSLeay_version(int unused) {
129 return "BoringSSL";
130 }
131
SSLeay(void)132 unsigned long SSLeay(void) {
133 return OPENSSL_VERSION_NUMBER;
134 }
135
CRYPTO_malloc_init(void)136 int CRYPTO_malloc_init(void) {
137 return 1;
138 }
139
ENGINE_load_builtin_engines(void)140 void ENGINE_load_builtin_engines(void) {}
141