87 lines
2.1 KiB
C
87 lines
2.1 KiB
C
/* $OpenBSD: bn_arch.h,v 1.7 2023/07/09 10:37:32 jsing Exp $ */
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/*
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* Copyright (c) 2023 Joel Sing <jsing@openbsd.org>
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*
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* Permission to use, copy, modify, and 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
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* ANY 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
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#include <openssl/bn.h>
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#ifndef HEADER_BN_ARCH_H
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#define HEADER_BN_ARCH_H
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#ifndef OPENSSL_NO_ASM
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#if defined(__GNUC__)
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#define HAVE_BN_ADDW
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static inline void
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bn_addw(BN_ULONG a, BN_ULONG b, BN_ULONG *out_r1, BN_ULONG *out_r0)
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{
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BN_ULONG carry, r0;
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__asm__ (
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"add %[r0], %[a], %[b] \n"
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"sltu %[carry], %[r0], %[a] \n"
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: [carry]"=r"(carry), [r0]"=&r"(r0)
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: [a]"r"(a), [b]"r"(b));
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*out_r1 = carry;
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*out_r0 = r0;
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}
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#define HAVE_BN_MULW
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static inline void
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bn_mulw(BN_ULONG a, BN_ULONG b, BN_ULONG *out_r1, BN_ULONG *out_r0)
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{
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BN_ULONG r1, r0;
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/*
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* Unsigned multiplication using a mulh/mul pair. Note that the order
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* of these instructions is important, as they can potentially be fused
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* into a single operation.
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*/
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__asm__ (
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"mulhu %[r1], %[a], %[b] \n"
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"mul %[r0], %[a], %[b] \n"
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: [r1]"=&r"(r1), [r0]"=r"(r0)
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: [a]"r"(a), [b]"r"(b));
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*out_r1 = r1;
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*out_r0 = r0;
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}
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#define HAVE_BN_SUBW
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static inline void
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bn_subw(BN_ULONG a, BN_ULONG b, BN_ULONG *out_borrow, BN_ULONG *out_r0)
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{
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BN_ULONG borrow, r0;
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__asm__ (
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"sub %[r0], %[a], %[b] \n"
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"sltu %[borrow], %[a], %[r0] \n"
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: [borrow]"=r"(borrow), [r0]"=&r"(r0)
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: [a]"r"(a), [b]"r"(b));
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*out_borrow = borrow;
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*out_r0 = r0;
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}
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#endif /* __GNUC__ */
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#endif
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#endif
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