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-rw-r--r--src/lib/libcrypto/modes/asm/ghash-s390x.pl262
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diff --git a/src/lib/libcrypto/modes/asm/ghash-s390x.pl b/src/lib/libcrypto/modes/asm/ghash-s390x.pl
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1#!/usr/bin/env perl
2
3# ====================================================================
4# Written by Andy Polyakov <appro@openssl.org> for the OpenSSL
5# project. The module is, however, dual licensed under OpenSSL and
6# CRYPTOGAMS licenses depending on where you obtain it. For further
7# details see http://www.openssl.org/~appro/cryptogams/.
8# ====================================================================
9
10# September 2010.
11#
12# The module implements "4-bit" GCM GHASH function and underlying
13# single multiplication operation in GF(2^128). "4-bit" means that it
14# uses 256 bytes per-key table [+128 bytes shared table]. Performance
15# was measured to be ~18 cycles per processed byte on z10, which is
16# almost 40% better than gcc-generated code. It should be noted that
17# 18 cycles is worse result than expected: loop is scheduled for 12
18# and the result should be close to 12. In the lack of instruction-
19# level profiling data it's impossible to tell why...
20
21# November 2010.
22#
23# Adapt for -m31 build. If kernel supports what's called "highgprs"
24# feature on Linux [see /proc/cpuinfo], it's possible to use 64-bit
25# instructions and achieve "64-bit" performance even in 31-bit legacy
26# application context. The feature is not specific to any particular
27# processor, as long as it's "z-CPU". Latter implies that the code
28# remains z/Architecture specific. On z990 it was measured to perform
29# 2.8x better than 32-bit code generated by gcc 4.3.
30
31# March 2011.
32#
33# Support for hardware KIMD-GHASH is verified to produce correct
34# result and therefore is engaged. On z196 it was measured to process
35# 8KB buffer ~7 faster than software implementation. It's not as
36# impressive for smaller buffer sizes and for smallest 16-bytes buffer
37# it's actually almost 2 times slower. Which is the reason why
38# KIMD-GHASH is not used in gcm_gmult_4bit.
39
40$flavour = shift;
41
42if ($flavour =~ /3[12]/) {
43 $SIZE_T=4;
44 $g="";
45} else {
46 $SIZE_T=8;
47 $g="g";
48}
49
50while (($output=shift) && ($output!~/^\w[\w\-]*\.\w+$/)) {}
51open STDOUT,">$output";
52
53$softonly=0;
54
55$Zhi="%r0";
56$Zlo="%r1";
57
58$Xi="%r2"; # argument block
59$Htbl="%r3";
60$inp="%r4";
61$len="%r5";
62
63$rem0="%r6"; # variables
64$rem1="%r7";
65$nlo="%r8";
66$nhi="%r9";
67$xi="%r10";
68$cnt="%r11";
69$tmp="%r12";
70$x78="%r13";
71$rem_4bit="%r14";
72
73$sp="%r15";
74
75$code.=<<___;
76.text
77
78.globl gcm_gmult_4bit
79.align 32
80gcm_gmult_4bit:
81___
82$code.=<<___ if(!$softonly && 0); # hardware is slow for single block...
83 larl %r1,OPENSSL_s390xcap_P
84 lg %r0,0(%r1)
85 tmhl %r0,0x4000 # check for message-security-assist
86 jz .Lsoft_gmult
87 lghi %r0,0
88 la %r1,16($sp)
89 .long 0xb93e0004 # kimd %r0,%r4
90 lg %r1,24($sp)
91 tmhh %r1,0x4000 # check for function 65
92 jz .Lsoft_gmult
93 stg %r0,16($sp) # arrange 16 bytes of zero input
94 stg %r0,24($sp)
95 lghi %r0,65 # function 65
96 la %r1,0($Xi) # H lies right after Xi in gcm128_context
97 la $inp,16($sp)
98 lghi $len,16
99 .long 0xb93e0004 # kimd %r0,$inp
100 brc 1,.-4 # pay attention to "partial completion"
101 br %r14
102.align 32
103.Lsoft_gmult:
104___
105$code.=<<___;
106 stm${g} %r6,%r14,6*$SIZE_T($sp)
107
108 aghi $Xi,-1
109 lghi $len,1
110 lghi $x78,`0xf<<3`
111 larl $rem_4bit,rem_4bit
112
113 lg $Zlo,8+1($Xi) # Xi
114 j .Lgmult_shortcut
115.type gcm_gmult_4bit,\@function
116.size gcm_gmult_4bit,(.-gcm_gmult_4bit)
117
118.globl gcm_ghash_4bit
119.align 32
120gcm_ghash_4bit:
121___
122$code.=<<___ if(!$softonly);
123 larl %r1,OPENSSL_s390xcap_P
124 lg %r0,0(%r1)
125 tmhl %r0,0x4000 # check for message-security-assist
126 jz .Lsoft_ghash
127 lghi %r0,0
128 la %r1,16($sp)
129 .long 0xb93e0004 # kimd %r0,%r4
130 lg %r1,24($sp)
131 tmhh %r1,0x4000 # check for function 65
132 jz .Lsoft_ghash
133 lghi %r0,65 # function 65
134 la %r1,0($Xi) # H lies right after Xi in gcm128_context
135 .long 0xb93e0004 # kimd %r0,$inp
136 brc 1,.-4 # pay attention to "partial completion"
137 br %r14
138.align 32
139.Lsoft_ghash:
140___
141$code.=<<___ if ($flavour =~ /3[12]/);
142 llgfr $len,$len
143___
144$code.=<<___;
145 stm${g} %r6,%r14,6*$SIZE_T($sp)
146
147 aghi $Xi,-1
148 srlg $len,$len,4
149 lghi $x78,`0xf<<3`
150 larl $rem_4bit,rem_4bit
151
152 lg $Zlo,8+1($Xi) # Xi
153 lg $Zhi,0+1($Xi)
154 lghi $tmp,0
155.Louter:
156 xg $Zhi,0($inp) # Xi ^= inp
157 xg $Zlo,8($inp)
158 xgr $Zhi,$tmp
159 stg $Zlo,8+1($Xi)
160 stg $Zhi,0+1($Xi)
161
162.Lgmult_shortcut:
163 lghi $tmp,0xf0
164 sllg $nlo,$Zlo,4
165 srlg $xi,$Zlo,8 # extract second byte
166 ngr $nlo,$tmp
167 lgr $nhi,$Zlo
168 lghi $cnt,14
169 ngr $nhi,$tmp
170
171 lg $Zlo,8($nlo,$Htbl)
172 lg $Zhi,0($nlo,$Htbl)
173
174 sllg $nlo,$xi,4
175 sllg $rem0,$Zlo,3
176 ngr $nlo,$tmp
177 ngr $rem0,$x78
178 ngr $xi,$tmp
179
180 sllg $tmp,$Zhi,60
181 srlg $Zlo,$Zlo,4
182 srlg $Zhi,$Zhi,4
183 xg $Zlo,8($nhi,$Htbl)
184 xg $Zhi,0($nhi,$Htbl)
185 lgr $nhi,$xi
186 sllg $rem1,$Zlo,3
187 xgr $Zlo,$tmp
188 ngr $rem1,$x78
189 j .Lghash_inner
190.align 16
191.Lghash_inner:
192 srlg $Zlo,$Zlo,4
193 sllg $tmp,$Zhi,60
194 xg $Zlo,8($nlo,$Htbl)
195 srlg $Zhi,$Zhi,4
196 llgc $xi,0($cnt,$Xi)
197 xg $Zhi,0($nlo,$Htbl)
198 sllg $nlo,$xi,4
199 xg $Zhi,0($rem0,$rem_4bit)
200 nill $nlo,0xf0
201 sllg $rem0,$Zlo,3
202 xgr $Zlo,$tmp
203 ngr $rem0,$x78
204 nill $xi,0xf0
205
206 sllg $tmp,$Zhi,60
207 srlg $Zlo,$Zlo,4
208 srlg $Zhi,$Zhi,4
209 xg $Zlo,8($nhi,$Htbl)
210 xg $Zhi,0($nhi,$Htbl)
211 lgr $nhi,$xi
212 xg $Zhi,0($rem1,$rem_4bit)
213 sllg $rem1,$Zlo,3
214 xgr $Zlo,$tmp
215 ngr $rem1,$x78
216 brct $cnt,.Lghash_inner
217
218 sllg $tmp,$Zhi,60
219 srlg $Zlo,$Zlo,4
220 srlg $Zhi,$Zhi,4
221 xg $Zlo,8($nlo,$Htbl)
222 xg $Zhi,0($nlo,$Htbl)
223 sllg $xi,$Zlo,3
224 xg $Zhi,0($rem0,$rem_4bit)
225 xgr $Zlo,$tmp
226 ngr $xi,$x78
227
228 sllg $tmp,$Zhi,60
229 srlg $Zlo,$Zlo,4
230 srlg $Zhi,$Zhi,4
231 xg $Zlo,8($nhi,$Htbl)
232 xg $Zhi,0($nhi,$Htbl)
233 xgr $Zlo,$tmp
234 xg $Zhi,0($rem1,$rem_4bit)
235
236 lg $tmp,0($xi,$rem_4bit)
237 la $inp,16($inp)
238 sllg $tmp,$tmp,4 # correct last rem_4bit[rem]
239 brctg $len,.Louter
240
241 xgr $Zhi,$tmp
242 stg $Zlo,8+1($Xi)
243 stg $Zhi,0+1($Xi)
244 lm${g} %r6,%r14,6*$SIZE_T($sp)
245 br %r14
246.type gcm_ghash_4bit,\@function
247.size gcm_ghash_4bit,(.-gcm_ghash_4bit)
248
249.align 64
250rem_4bit:
251 .long `0x0000<<12`,0,`0x1C20<<12`,0,`0x3840<<12`,0,`0x2460<<12`,0
252 .long `0x7080<<12`,0,`0x6CA0<<12`,0,`0x48C0<<12`,0,`0x54E0<<12`,0
253 .long `0xE100<<12`,0,`0xFD20<<12`,0,`0xD940<<12`,0,`0xC560<<12`,0
254 .long `0x9180<<12`,0,`0x8DA0<<12`,0,`0xA9C0<<12`,0,`0xB5E0<<12`,0
255.type rem_4bit,\@object
256.size rem_4bit,(.-rem_4bit)
257.string "GHASH for s390x, CRYPTOGAMS by <appro\@openssl.org>"
258___
259
260$code =~ s/\`([^\`]*)\`/eval $1/gem;
261print $code;
262close STDOUT;
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