75 lines
2.5 KiB
C
75 lines
2.5 KiB
C
/* Copyright (c) 2014, Google Inc.
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*
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* Permission to use, copy, modify, and/or distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
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* SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
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* OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
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* CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */
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#if defined(__linux__)
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#define _GNU_SOURCE
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#endif
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#include <GFp/cpu.h>
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#include "internal.h"
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// Our assembly does not use the GOT to reference symbols, which means
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// references to visible symbols will often require a TEXTREL. This is
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// undesirable, so all assembly-referenced symbols should be hidden. CPU
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// capabilities are the only such symbols defined in C. Explicitly hide them,
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// rather than rely on being built with -fvisibility=hidden.
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#if defined(OPENSSL_WINDOWS)
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#define HIDDEN
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#else
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#define HIDDEN __attribute__((visibility("hidden")))
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#endif
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#if defined(OPENSSL_X86) || defined(OPENSSL_X86_64)
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// This value must be explicitly initialised to zero in order to work around a
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// bug in libtool or the linker on OS X.
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//
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// If not initialised then it becomes a "common symbol". When put into an
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// archive, linking on OS X will fail to resolve common symbols. By
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// initialising it to zero, it becomes a "data symbol", which isn't so
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// affected.
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HIDDEN uint32_t GFp_ia32cap_P[4] = {0};
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#elif defined(OPENSSL_ARM) || defined(OPENSSL_AARCH64)
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#include <GFp/arm_arch.h>
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HIDDEN uint32_t GFp_armcap_P = 0;
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#endif
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#if defined(__linux__)
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// The getrandom syscall was added in Linux 3.17. For some important platforms,
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// we also support building against older kernels' headers. For other
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// platforms, the newer kernel's headers are required. */
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#if !defined(SYS_getrandom)
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#if defined(OPENSSL_AARCH64)
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#define SYS_getrandom 278
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#elif defined(OPENSSL_ARM)
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#define SYS_getrandom 384
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#elif defined(OPENSSL_X86)
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#define SYS_getrandom 355
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#elif defined(OPENSSL_X86_64)
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#define SYS_getrandom 318
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#else
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#include <sys/syscall.h>
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#if !defined(SYS_getrandom)
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#error "Error: Kernel headers are too old; SYS_getrandom not defined."
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#endif
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#endif
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#endif
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const long GFp_SYS_GETRANDOM = SYS_getrandom;
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#endif
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