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| #! /usr/bin/env perl
| # Copyright 2007-2020 The OpenSSL Project Authors. All Rights Reserved.
| #
| # Licensed under the OpenSSL license (the "License"). You may not use
| # this file except in compliance with the License. You can obtain a copy
| # in the file LICENSE in the source distribution or at
| # https://www.openssl.org/source/license.html
|
|
| # ====================================================================
| # Written by Andy Polyakov <appro@openssl.org> for the OpenSSL
| # project. The module is, however, dual licensed under OpenSSL and
| # CRYPTOGAMS licenses depending on where you obtain it. For further
| # details see http://www.openssl.org/~appro/cryptogams/.
| # ====================================================================
|
| # sha1_block for Thumb.
| #
| # January 2007.
| #
| # The code does not present direct interest to OpenSSL, because of low
| # performance. Its purpose is to establish _size_ benchmark. Pretty
| # useless one I must say, because 30% or 88 bytes larger ARMv4 code
| # [available on demand] is almost _twice_ as fast. It should also be
| # noted that in-lining of .Lcommon and .Lrotate improves performance
| # by over 40%, while code increases by only 10% or 32 bytes. But once
| # again, the goal was to establish _size_ benchmark, not performance.
|
| $output=shift;
| open STDOUT,">$output";
|
| $inline=0;
| #$cheat_on_binutils=1;
|
| $t0="r0";
| $t1="r1";
| $t2="r2";
| $a="r3";
| $b="r4";
| $c="r5";
| $d="r6";
| $e="r7";
| $K="r8"; # "upper" registers can be used in add/sub and mov insns
| $ctx="r9";
| $inp="r10";
| $len="r11";
| $Xi="r12";
|
| sub common {
| <<___;
| sub $t0,#4
| ldr $t1,[$t0]
| add $e,$K @ E+=K_xx_xx
| lsl $t2,$a,#5
| add $t2,$e
| lsr $e,$a,#27
| add $t2,$e @ E+=ROR(A,27)
| add $t2,$t1 @ E+=X[i]
| ___
| }
| sub rotate {
| <<___;
| mov $e,$d @ E=D
| mov $d,$c @ D=C
| lsl $c,$b,#30
| lsr $b,$b,#2
| orr $c,$b @ C=ROR(B,2)
| mov $b,$a @ B=A
| add $a,$t2,$t1 @ A=E+F_xx_xx(B,C,D)
| ___
| }
|
| sub BODY_00_19 {
| $code.=$inline?&common():"\tbl .Lcommon\n";
| $code.=<<___;
| mov $t1,$c
| eor $t1,$d
| and $t1,$b
| eor $t1,$d @ F_00_19(B,C,D)
| ___
| $code.=$inline?&rotate():"\tbl .Lrotate\n";
| }
|
| sub BODY_20_39 {
| $code.=$inline?&common():"\tbl .Lcommon\n";
| $code.=<<___;
| mov $t1,$b
| eor $t1,$c
| eor $t1,$d @ F_20_39(B,C,D)
| ___
| $code.=$inline?&rotate():"\tbl .Lrotate\n";
| }
|
| sub BODY_40_59 {
| $code.=$inline?&common():"\tbl .Lcommon\n";
| $code.=<<___;
| mov $t1,$b
| and $t1,$c
| mov $e,$b
| orr $e,$c
| and $e,$d
| orr $t1,$e @ F_40_59(B,C,D)
| ___
| $code.=$inline?&rotate():"\tbl .Lrotate\n";
| }
|
| $code=<<___;
| .text
| .code 16
|
| .global sha1_block_data_order
| .type sha1_block_data_order,%function
|
| .align 2
| sha1_block_data_order:
| ___
| if ($cheat_on_binutils) {
| $code.=<<___;
| .code 32
| add r3,pc,#1
| bx r3 @ switch to Thumb ISA
| .code 16
| ___
| }
| $code.=<<___;
| push {r4-r7}
| mov r3,r8
| mov r4,r9
| mov r5,r10
| mov r6,r11
| mov r7,r12
| push {r3-r7,lr}
| lsl r2,#6
| mov $ctx,r0 @ save context
| mov $inp,r1 @ save inp
| mov $len,r2 @ save len
| add $len,$inp @ $len to point at inp end
|
| .Lloop:
| mov $Xi,sp
| mov $t2,sp
| sub $t2,#16*4 @ [3]
| .LXload:
| ldrb $a,[$t1,#0] @ $t1 is r1 and holds inp
| ldrb $b,[$t1,#1]
| ldrb $c,[$t1,#2]
| ldrb $d,[$t1,#3]
| lsl $a,#24
| lsl $b,#16
| lsl $c,#8
| orr $a,$b
| orr $a,$c
| orr $a,$d
| add $t1,#4
| push {$a}
| cmp sp,$t2
| bne .LXload @ [+14*16]
|
| mov $inp,$t1 @ update $inp
| sub $t2,#32*4
| sub $t2,#32*4
| mov $e,#31 @ [+4]
| .LXupdate:
| ldr $a,[sp,#15*4]
| ldr $b,[sp,#13*4]
| ldr $c,[sp,#7*4]
| ldr $d,[sp,#2*4]
| eor $a,$b
| eor $a,$c
| eor $a,$d
| ror $a,$e
| push {$a}
| cmp sp,$t2
| bne .LXupdate @ [+(11+1)*64]
|
| ldmia $t0!,{$a,$b,$c,$d,$e} @ $t0 is r0 and holds ctx
| mov $t0,$Xi
|
| ldr $t2,.LK_00_19
| mov $t1,$t0
| sub $t1,#20*4
| mov $Xi,$t1
| mov $K,$t2 @ [+7+4]
| .L_00_19:
| ___
| &BODY_00_19();
| $code.=<<___;
| cmp $Xi,$t0
| bne .L_00_19 @ [+(2+9+4+2+8+2)*20]
|
| ldr $t2,.LK_20_39
| mov $t1,$t0
| sub $t1,#20*4
| mov $Xi,$t1
| mov $K,$t2 @ [+5]
| .L_20_39_or_60_79:
| ___
| &BODY_20_39();
| $code.=<<___;
| cmp $Xi,$t0
| bne .L_20_39_or_60_79 @ [+(2+9+3+2+8+2)*20*2]
| cmp sp,$t0
| beq .Ldone @ [+2]
|
| ldr $t2,.LK_40_59
| mov $t1,$t0
| sub $t1,#20*4
| mov $Xi,$t1
| mov $K,$t2 @ [+5]
| .L_40_59:
| ___
| &BODY_40_59();
| $code.=<<___;
| cmp $Xi,$t0
| bne .L_40_59 @ [+(2+9+6+2+8+2)*20]
|
| ldr $t2,.LK_60_79
| mov $Xi,sp
| mov $K,$t2
| b .L_20_39_or_60_79 @ [+4]
| .Ldone:
| mov $t0,$ctx
| ldr $t1,[$t0,#0]
| ldr $t2,[$t0,#4]
| add $a,$t1
| ldr $t1,[$t0,#8]
| add $b,$t2
| ldr $t2,[$t0,#12]
| add $c,$t1
| ldr $t1,[$t0,#16]
| add $d,$t2
| add $e,$t1
| stmia $t0!,{$a,$b,$c,$d,$e} @ [+20]
|
| add sp,#80*4 @ deallocate stack frame
| mov $t0,$ctx @ restore ctx
| mov $t1,$inp @ restore inp
| cmp $t1,$len
| beq .Lexit
| b .Lloop @ [+6] total 3212 cycles
| .Lexit:
| pop {r2-r7}
| mov r8,r2
| mov r9,r3
| mov r10,r4
| mov r11,r5
| mov r12,r6
| mov lr,r7
| pop {r4-r7}
| bx lr
| .align 2
| ___
| $code.=".Lcommon:\n".&common()."\tmov pc,lr\n" if (!$inline);
| $code.=".Lrotate:\n".&rotate()."\tmov pc,lr\n" if (!$inline);
| $code.=<<___;
| .align 2
| .LK_00_19: .word 0x5a827999
| .LK_20_39: .word 0x6ed9eba1
| .LK_40_59: .word 0x8f1bbcdc
| .LK_60_79: .word 0xca62c1d6
| .size sha1_block_data_order,.-sha1_block_data_order
| .asciz "SHA1 block transform for Thumb, CRYPTOGAMS by <appro\@openssl.org>"
| ___
|
| print $code;
| close STDOUT or die "error closing STDOUT: $!"; # enforce flush
|
|
