1#! /usr/bin/env perl
2# Copyright 2012-2020 The OpenSSL Project Authors. All Rights Reserved.
3#
4# Licensed under the OpenSSL license (the "License").  You may not use
5# this file except in compliance with the License.  You can obtain a copy
6# in the file LICENSE in the source distribution or at
7# https://www.openssl.org/source/license.html
8
9#
10# ====================================================================
11# Written by Andy Polyakov <appro@openssl.org> for the OpenSSL
12# project. The module is, however, dual licensed under OpenSSL and
13# CRYPTOGAMS licenses depending on where you obtain it. For further
14# details see http://www.openssl.org/~appro/cryptogams/.
15# ====================================================================
16#
17# October 2012
18#
19# The module implements bn_GF2m_mul_2x2 polynomial multiplication used
20# in bn_gf2m.c. It's kind of low-hanging mechanical port from C for
21# the time being... Except that it has two code paths: one suitable
22# for all SPARCv9 processors and one for VIS3-capable ones. Former
23# delivers ~25-45% more, more for longer keys, heaviest DH and DSA
24# verify operations on venerable UltraSPARC II. On T4 VIS3 code is
25# ~100-230% faster than gcc-generated code and ~35-90% faster than
26# the pure SPARCv9 code path.
27
28$output = pop;
29open STDOUT,">$output";
30
31$locals=16*8;
32
33$tab="%l0";
34
35@T=("%g2","%g3");
36@i=("%g4","%g5");
37
38($a1,$a2,$a4,$a8,$a12,$a48)=map("%o$_",(0..5));
39($lo,$hi,$b)=("%g1",$a8,"%o7"); $a=$lo;
40
41$code.=<<___;
42#include <sparc_arch.h>
43
44#ifdef __arch64__
45.register	%g2,#scratch
46.register	%g3,#scratch
47#endif
48
49#ifdef __PIC__
50SPARC_PIC_THUNK(%g1)
51#endif
52
53.globl	bn_GF2m_mul_2x2
54.align	16
55bn_GF2m_mul_2x2:
56        SPARC_LOAD_ADDRESS_LEAF(OPENSSL_sparcv9cap_P,%g1,%g5)
57        ld	[%g1+0],%g1             	! OPENSSL_sparcv9cap_P[0]
58
59        andcc	%g1, SPARCV9_VIS3, %g0
60        bz,pn	%icc,.Lsoftware
61        nop
62
63	sllx	%o1, 32, %o1
64	sllx	%o3, 32, %o3
65	or	%o2, %o1, %o1
66	or	%o4, %o3, %o3
67	.word	0x95b262ab			! xmulx   %o1, %o3, %o2
68	.word	0x99b262cb			! xmulxhi %o1, %o3, %o4
69	srlx	%o2, 32, %o1			! 13 cycles later
70	st	%o2, [%o0+0]
71	st	%o1, [%o0+4]
72	srlx	%o4, 32, %o3
73	st	%o4, [%o0+8]
74	retl
75	st	%o3, [%o0+12]
76
77.align	16
78.Lsoftware:
79	save	%sp,-STACK_FRAME-$locals,%sp
80
81	sllx	%i1,32,$a
82	mov	-1,$a12
83	sllx	%i3,32,$b
84	or	%i2,$a,$a
85	srlx	$a12,1,$a48			! 0x7fff...
86	or	%i4,$b,$b
87	srlx	$a12,2,$a12			! 0x3fff...
88	add	%sp,STACK_BIAS+STACK_FRAME,$tab
89
90	sllx	$a,2,$a4
91	mov	$a,$a1
92	sllx	$a,1,$a2
93
94	srax	$a4,63,@i[1]			! broadcast 61st bit
95	and	$a48,$a4,$a4			! (a<<2)&0x7fff...
96	srlx	$a48,2,$a48
97	srax	$a2,63,@i[0]			! broadcast 62nd bit
98	and	$a12,$a2,$a2			! (a<<1)&0x3fff...
99	srax	$a1,63,$lo			! broadcast 63rd bit
100	and	$a48,$a1,$a1			! (a<<0)&0x1fff...
101
102	sllx	$a1,3,$a8
103	and	$b,$lo,$lo
104	and	$b,@i[0],@i[0]
105	and	$b,@i[1],@i[1]
106
107	stx	%g0,[$tab+0*8]			! tab[0]=0
108	xor	$a1,$a2,$a12
109	stx	$a1,[$tab+1*8]			! tab[1]=a1
110	stx	$a2,[$tab+2*8]			! tab[2]=a2
111	 xor	$a4,$a8,$a48
112	stx	$a12,[$tab+3*8]			! tab[3]=a1^a2
113	 xor	$a4,$a1,$a1
114
115	stx	$a4,[$tab+4*8]			! tab[4]=a4
116	xor	$a4,$a2,$a2
117	stx	$a1,[$tab+5*8]			! tab[5]=a1^a4
118	xor	$a4,$a12,$a12
119	stx	$a2,[$tab+6*8]			! tab[6]=a2^a4
120	 xor	$a48,$a1,$a1
121	stx	$a12,[$tab+7*8]			! tab[7]=a1^a2^a4
122	 xor	$a48,$a2,$a2
123
124	stx	$a8,[$tab+8*8]			! tab[8]=a8
125	xor	$a48,$a12,$a12
126	stx	$a1,[$tab+9*8]			! tab[9]=a1^a8
127	 xor	$a4,$a1,$a1
128	stx	$a2,[$tab+10*8]			! tab[10]=a2^a8
129	 xor	$a4,$a2,$a2
130	stx	$a12,[$tab+11*8]		! tab[11]=a1^a2^a8
131
132	xor	$a4,$a12,$a12
133	stx	$a48,[$tab+12*8]		! tab[12]=a4^a8
134	 srlx	$lo,1,$hi
135	stx	$a1,[$tab+13*8]			! tab[13]=a1^a4^a8
136	 sllx	$lo,63,$lo
137	stx	$a2,[$tab+14*8]			! tab[14]=a2^a4^a8
138	 srlx	@i[0],2,@T[0]
139	stx	$a12,[$tab+15*8]		! tab[15]=a1^a2^a4^a8
140
141	sllx	@i[0],62,$a1
142	 sllx	$b,3,@i[0]
143	srlx	@i[1],3,@T[1]
144	 and	@i[0],`0xf<<3`,@i[0]
145	sllx	@i[1],61,$a2
146	 ldx	[$tab+@i[0]],@i[0]
147	 srlx	$b,4-3,@i[1]
148	xor	@T[0],$hi,$hi
149	 and	@i[1],`0xf<<3`,@i[1]
150	xor	$a1,$lo,$lo
151	 ldx	[$tab+@i[1]],@i[1]
152	xor	@T[1],$hi,$hi
153
154	xor	@i[0],$lo,$lo
155	srlx	$b,8-3,@i[0]
156	 xor	$a2,$lo,$lo
157	and	@i[0],`0xf<<3`,@i[0]
158___
159for($n=1;$n<14;$n++) {
160$code.=<<___;
161	sllx	@i[1],`$n*4`,@T[0]
162	ldx	[$tab+@i[0]],@i[0]
163	srlx	@i[1],`64-$n*4`,@T[1]
164	xor	@T[0],$lo,$lo
165	srlx	$b,`($n+2)*4`-3,@i[1]
166	xor	@T[1],$hi,$hi
167	and	@i[1],`0xf<<3`,@i[1]
168___
169	push(@i,shift(@i)); push(@T,shift(@T));
170}
171$code.=<<___;
172	sllx	@i[1],`$n*4`,@T[0]
173	ldx	[$tab+@i[0]],@i[0]
174	srlx	@i[1],`64-$n*4`,@T[1]
175	xor	@T[0],$lo,$lo
176
177	sllx	@i[0],`($n+1)*4`,@T[0]
178	 xor	@T[1],$hi,$hi
179	srlx	@i[0],`64-($n+1)*4`,@T[1]
180	xor	@T[0],$lo,$lo
181	xor	@T[1],$hi,$hi
182
183	srlx	$lo,32,%i1
184	st	$lo,[%i0+0]
185	st	%i1,[%i0+4]
186	srlx	$hi,32,%i2
187	st	$hi,[%i0+8]
188	st	%i2,[%i0+12]
189
190	ret
191	restore
192.type	bn_GF2m_mul_2x2,#function
193.size	bn_GF2m_mul_2x2,.-bn_GF2m_mul_2x2
194.asciz	"GF(2^m) Multiplication for SPARCv9, CRYPTOGAMS by <appro\@openssl.org>"
195.align	4
196___
197
198$code =~ s/\`([^\`]*)\`/eval($1)/gem;
199print $code;
200close STDOUT or die "error closing STDOUT: $!";
201