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
43 static inline void
bn_div_rem_words_inline(BN_ULONG h,BN_ULONG l,BN_ULONG d,BN_ULONG * out_q,BN_ULONG * out_r)44 bn_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
66 static inline void
bn_mulw(BN_ULONG a,BN_ULONG b,BN_ULONG * out_r1,BN_ULONG * out_r0)67 bn_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