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diff --git a/src/lib/libcrypto/sha/asm/sha1-thumb.pl b/src/lib/libcrypto/sha/asm/sha1-thumb.pl
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1#!/usr/bin/env perl
2
3# ====================================================================
4# Written by Andy Polyakov <appro@fy.chalmers.se> 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# sha1_block for Thumb.
11#
12# January 2007.
13#
14# The code does not present direct interest to OpenSSL, because of low
15# performance. Its purpose is to establish _size_ benchmark. Pretty
16# useless one I must say, because 30% or 88 bytes larger ARMv4 code
17# [avialable on demand] is almost _twice_ as fast. It should also be
18# noted that in-lining of .Lcommon and .Lrotate improves performance
19# by over 40%, while code increases by only 10% or 32 bytes. But once
20# again, the goal was to establish _size_ benchmark, not performance.
21
22$output=shift;
23open STDOUT,">$output";
24
25$inline=0;
26#$cheat_on_binutils=1;
27
28$t0="r0";
29$t1="r1";
30$t2="r2";
31$a="r3";
32$b="r4";
33$c="r5";
34$d="r6";
35$e="r7";
36$K="r8"; # "upper" registers can be used in add/sub and mov insns
37$ctx="r9";
38$inp="r10";
39$len="r11";
40$Xi="r12";
41
42sub common {
43<<___;
44 sub $t0,#4
45 ldr $t1,[$t0]
46 add $e,$K @ E+=K_xx_xx
47 lsl $t2,$a,#5
48 add $t2,$e
49 lsr $e,$a,#27
50 add $t2,$e @ E+=ROR(A,27)
51 add $t2,$t1 @ E+=X[i]
52___
53}
54sub rotate {
55<<___;
56 mov $e,$d @ E=D
57 mov $d,$c @ D=C
58 lsl $c,$b,#30
59 lsr $b,$b,#2
60 orr $c,$b @ C=ROR(B,2)
61 mov $b,$a @ B=A
62 add $a,$t2,$t1 @ A=E+F_xx_xx(B,C,D)
63___
64}
65
66sub BODY_00_19 {
67$code.=$inline?&common():"\tbl .Lcommon\n";
68$code.=<<___;
69 mov $t1,$c
70 eor $t1,$d
71 and $t1,$b
72 eor $t1,$d @ F_00_19(B,C,D)
73___
74$code.=$inline?&rotate():"\tbl .Lrotate\n";
75}
76
77sub BODY_20_39 {
78$code.=$inline?&common():"\tbl .Lcommon\n";
79$code.=<<___;
80 mov $t1,$b
81 eor $t1,$c
82 eor $t1,$d @ F_20_39(B,C,D)
83___
84$code.=$inline?&rotate():"\tbl .Lrotate\n";
85}
86
87sub BODY_40_59 {
88$code.=$inline?&common():"\tbl .Lcommon\n";
89$code.=<<___;
90 mov $t1,$b
91 and $t1,$c
92 mov $e,$b
93 orr $e,$c
94 and $e,$d
95 orr $t1,$e @ F_40_59(B,C,D)
96___
97$code.=$inline?&rotate():"\tbl .Lrotate\n";
98}
99
100$code=<<___;
101.text
102.code 16
103
104.global sha1_block_data_order
105.type sha1_block_data_order,%function
106
107.align 2
108sha1_block_data_order:
109___
110if ($cheat_on_binutils) {
111$code.=<<___;
112.code 32
113 add r3,pc,#1
114 bx r3 @ switch to Thumb ISA
115.code 16
116___
117}
118$code.=<<___;
119 push {r4-r7}
120 mov r3,r8
121 mov r4,r9
122 mov r5,r10
123 mov r6,r11
124 mov r7,r12
125 push {r3-r7,lr}
126 lsl r2,#6
127 mov $ctx,r0 @ save context
128 mov $inp,r1 @ save inp
129 mov $len,r2 @ save len
130 add $len,$inp @ $len to point at inp end
131
132.Lloop:
133 mov $Xi,sp
134 mov $t2,sp
135 sub $t2,#16*4 @ [3]
136.LXload:
137 ldrb $a,[$t1,#0] @ $t1 is r1 and holds inp
138 ldrb $b,[$t1,#1]
139 ldrb $c,[$t1,#2]
140 ldrb $d,[$t1,#3]
141 lsl $a,#24
142 lsl $b,#16
143 lsl $c,#8
144 orr $a,$b
145 orr $a,$c
146 orr $a,$d
147 add $t1,#4
148 push {$a}
149 cmp sp,$t2
150 bne .LXload @ [+14*16]
151
152 mov $inp,$t1 @ update $inp
153 sub $t2,#32*4
154 sub $t2,#32*4
155 mov $e,#31 @ [+4]
156.LXupdate:
157 ldr $a,[sp,#15*4]
158 ldr $b,[sp,#13*4]
159 ldr $c,[sp,#7*4]
160 ldr $d,[sp,#2*4]
161 eor $a,$b
162 eor $a,$c
163 eor $a,$d
164 ror $a,$e
165 push {$a}
166 cmp sp,$t2
167 bne .LXupdate @ [+(11+1)*64]
168
169 ldmia $t0!,{$a,$b,$c,$d,$e} @ $t0 is r0 and holds ctx
170 mov $t0,$Xi
171
172 ldr $t2,.LK_00_19
173 mov $t1,$t0
174 sub $t1,#20*4
175 mov $Xi,$t1
176 mov $K,$t2 @ [+7+4]
177.L_00_19:
178___
179 &BODY_00_19();
180$code.=<<___;
181 cmp $Xi,$t0
182 bne .L_00_19 @ [+(2+9+4+2+8+2)*20]
183
184 ldr $t2,.LK_20_39
185 mov $t1,$t0
186 sub $t1,#20*4
187 mov $Xi,$t1
188 mov $K,$t2 @ [+5]
189.L_20_39_or_60_79:
190___
191 &BODY_20_39();
192$code.=<<___;
193 cmp $Xi,$t0
194 bne .L_20_39_or_60_79 @ [+(2+9+3+2+8+2)*20*2]
195 cmp sp,$t0
196 beq .Ldone @ [+2]
197
198 ldr $t2,.LK_40_59
199 mov $t1,$t0
200 sub $t1,#20*4
201 mov $Xi,$t1
202 mov $K,$t2 @ [+5]
203.L_40_59:
204___
205 &BODY_40_59();
206$code.=<<___;
207 cmp $Xi,$t0
208 bne .L_40_59 @ [+(2+9+6+2+8+2)*20]
209
210 ldr $t2,.LK_60_79
211 mov $Xi,sp
212 mov $K,$t2
213 b .L_20_39_or_60_79 @ [+4]
214.Ldone:
215 mov $t0,$ctx
216 ldr $t1,[$t0,#0]
217 ldr $t2,[$t0,#4]
218 add $a,$t1
219 ldr $t1,[$t0,#8]
220 add $b,$t2
221 ldr $t2,[$t0,#12]
222 add $c,$t1
223 ldr $t1,[$t0,#16]
224 add $d,$t2
225 add $e,$t1
226 stmia $t0!,{$a,$b,$c,$d,$e} @ [+20]
227
228 add sp,#80*4 @ deallocate stack frame
229 mov $t0,$ctx @ restore ctx
230 mov $t1,$inp @ restore inp
231 cmp $t1,$len
232 beq .Lexit
233 b .Lloop @ [+6] total 3212 cycles
234.Lexit:
235 pop {r2-r7}
236 mov r8,r2
237 mov r9,r3
238 mov r10,r4
239 mov r11,r5
240 mov r12,r6
241 mov lr,r7
242 pop {r4-r7}
243 bx lr
244.align 2
245___
246$code.=".Lcommon:\n".&common()."\tmov pc,lr\n" if (!$inline);
247$code.=".Lrotate:\n".&rotate()."\tmov pc,lr\n" if (!$inline);
248$code.=<<___;
249.align 2
250.LK_00_19: .word 0x5a827999
251.LK_20_39: .word 0x6ed9eba1
252.LK_40_59: .word 0x8f1bbcdc
253.LK_60_79: .word 0xca62c1d6
254.size sha1_block_data_order,.-sha1_block_data_order
255.asciz "SHA1 block transform for Thumb, CRYPTOGAMS by <appro\@openssl.org>"
256___
257
258print $code;
259close STDOUT; # enforce flush
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