74 lines
1.9 KiB
C
74 lines
1.9 KiB
C
/* $OpenBSD: bn_arch.h,v 1.2 2023/06/24 15:51:47 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_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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"mov %[borrow], #0 \n"
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"subs %[r0], %[a], %[b] \n"
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"sbc %[borrow], %[borrow], #0 \n"
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"neg %[borrow], %[borrow] \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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: "cc");
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*out_borrow = borrow;
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*out_r0 = r0;
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}
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#define HAVE_BN_SUBW_SUBW
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static inline void
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bn_subw_subw(BN_ULONG a, BN_ULONG b, BN_ULONG c, BN_ULONG *out_borrow,
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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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"mov %[borrow], #0 \n"
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"subs %[r0], %[a], %[b] \n"
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"sbc %[borrow], %[borrow], #0 \n"
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"subs %[r0], %[r0], %[c] \n"
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"sbc %[borrow], %[borrow], #0 \n"
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"neg %[borrow], %[borrow] \n"
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: [borrow]"=&r"(borrow), [r0]"=&r"(r0)
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: [a]"r"(a), [b]"r"(b), [c]"r"(c)
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: "cc");
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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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