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 "internal.h"
18
19
20 #if !defined(OPENSSL_NO_ASM) && \
21 (defined(OPENSSL_X86) || defined(OPENSSL_X86_64) || \
22 defined(OPENSSL_ARM) || defined(OPENSSL_AARCH64))
23 /* x86, x86_64 and the ARMs need to record the result of a cpuid call for the
24 * asm to work correctly, unless compiled without asm code. */
25 #define NEED_CPUID
26
27 #else
28
29 /* Otherwise, don't emit a static initialiser. */
30
31 #if !defined(BORINGSSL_NO_STATIC_INITIALIZER)
32 #define BORINGSSL_NO_STATIC_INITIALIZER
33 #endif
34
35 #endif /* !OPENSSL_NO_ASM && (OPENSSL_X86 || OPENSSL_X86_64 ||
36 OPENSSL_ARM || OPENSSL_AARCH64) */
37
38
39 /* The capability variables are defined in this file in order to work around a
40 * linker bug. When linking with a .a, if no symbols in a .o are referenced
41 * then the .o is discarded, even if it has constructor functions.
42 *
43 * This still means that any binaries that don't include some functionality
44 * that tests the capability values will still skip the constructor but, so
45 * far, the init constructor function only sets the capability variables. */
46
47 #if defined(OPENSSL_X86) || defined(OPENSSL_X86_64)
48 /* This value must be explicitly initialised to zero in order to work around a
49 * bug in libtool or the linker on OS X.
50 *
51 * If not initialised then it becomes a "common symbol". When put into an
52 * archive, linking on OS X will fail to resolve common symbols. By
53 * initialising it to zero, it becomes a "data symbol", which isn't so
54 * affected. */
55 uint32_t OPENSSL_ia32cap_P[4] = {0};
56 #elif defined(OPENSSL_ARM) || defined(OPENSSL_AARCH64)
57
58 #include "arm_arch.h"
59
60 #if defined(__ARM_NEON__)
61 uint32_t OPENSSL_armcap_P = ARMV7_NEON | ARMV7_NEON_FUNCTIONAL;
62 #else
63 uint32_t OPENSSL_armcap_P = ARMV7_NEON_FUNCTIONAL;
64 #endif
65
66 #endif
67
68
69 #if defined(OPENSSL_WINDOWS)
70 #define OPENSSL_CDECL __cdecl
71 #else
72 #define OPENSSL_CDECL
73 #endif
74
75 #if !defined(BORINGSSL_NO_STATIC_INITIALIZER)
76 #if !defined(OPENSSL_WINDOWS)
77 static void do_library_init(void) __attribute__ ((constructor));
78 #else
79 #pragma section(".CRT$XCU", read)
80 static void __cdecl do_library_init(void);
81 __declspec(allocate(".CRT$XCU")) void(*library_init_constructor)(void) =
82 do_library_init;
83 #endif
84 #endif /* !BORINGSSL_NO_STATIC_INITIALIZER */
85
86 /* do_library_init is the actual initialization function. If
87 * BORINGSSL_NO_STATIC_INITIALIZER isn't defined, this is set as a static
88 * initializer. Otherwise, it is called by CRYPTO_library_init. */
do_library_init(void)89 static void OPENSSL_CDECL do_library_init(void) {
90 /* WARNING: this function may only configure the capability variables. See the
91 * note above about the linker bug. */
92 #if defined(NEED_CPUID)
93 OPENSSL_cpuid_setup();
94 #endif
95 }
96
CRYPTO_library_init(void)97 void CRYPTO_library_init(void) {
98 /* TODO(davidben): It would be tidier if this build knob could be replaced
99 * with an internal lazy-init mechanism that would handle things correctly
100 * in-library. */
101 #if defined(BORINGSSL_NO_STATIC_INITIALIZER)
102 do_library_init();
103 #endif
104 }
105
SSLeay_version(int unused)106 const char *SSLeay_version(int unused) {
107 return "BoringSSL";
108 }
109
SSLeay(void)110 unsigned long SSLeay(void) {
111 return OPENSSL_VERSION_NUMBER;
112 }
113