1/* $OpenBSD: bn_arch.h,v 1.9 2023/02/16 10:41:03 jsing Exp $ */ 2/* 3 * Copyright (c) 2023 Joel Sing <jsing@openbsd.org> 4 * 5 * Permission to use, copy, modify, and distribute this software for any 6 * purpose with or without fee is hereby granted, provided that the above 7 * copyright notice and this permission notice appear in all copies. 8 * 9 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 10 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 11 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 12 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 13 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 14 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 15 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 16 */ 17 18#include <openssl/bn.h> 19 20#ifndef HEADER_BN_ARCH_H 21#define HEADER_BN_ARCH_H 22 23#ifndef OPENSSL_NO_ASM 24 25#define HAVE_BN_ADD_WORDS 26 27#define HAVE_BN_DIV_WORDS 28 29#define HAVE_BN_MUL_ADD_WORDS 30#define HAVE_BN_MUL_COMBA4 31#define HAVE_BN_MUL_COMBA8 32#define HAVE_BN_MUL_WORDS 33 34#define HAVE_BN_SQR_COMBA4 35#define HAVE_BN_SQR_COMBA8 36#define HAVE_BN_SQR_WORDS 37 38#define HAVE_BN_SUB_WORDS 39 40#if defined(__GNUC__) 41#define HAVE_BN_DIV_REM_WORDS_INLINE 42 43static inline void 44bn_div_rem_words_inline(BN_ULONG h, BN_ULONG l, BN_ULONG d, BN_ULONG *out_q, 45 BN_ULONG *out_r) 46{ 47 BN_ULONG q, r; 48 49 /* 50 * Unsigned division of %edx:%eax by d with quotient being stored in 51 * %eax and remainder in %edx. 52 */ 53 __asm__ volatile ("divl %4" 54 : "=a"(q), "=d"(r) 55 : "a"(l), "d"(h), "rm"(d) 56 : "cc"); 57 58 *out_q = q; 59 *out_r = r; 60} 61#endif /* __GNUC__ */ 62 63#if defined(__GNUC__) 64#define HAVE_BN_MULW 65 66static inline void 67bn_mulw(BN_ULONG a, BN_ULONG b, BN_ULONG *out_r1, BN_ULONG *out_r0) 68{ 69 BN_ULONG r1, r0; 70 71 /* 72 * Unsigned multiplication of %eax, with the double word result being 73 * stored in %edx:%eax. 74 */ 75 __asm__ ("mull %3" 76 : "=d"(r1), "=a"(r0) 77 : "a"(a), "rm"(b) 78 : "cc"); 79 80 *out_r1 = r1; 81 *out_r0 = r0; 82} 83#endif /* __GNUC__ */ 84 85#endif 86#endif 87