228 lines
5.8 KiB
Prolog
228 lines
5.8 KiB
Prolog
#!/usr/bin/env perl
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# ====================================================================
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# Written by Andy Polyakov <appro@fy.chalmers.se> for the OpenSSL
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# project. The module is, however, dual licensed under OpenSSL and
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# CRYPTOGAMS licenses depending on where you obtain it. For further
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# details see http://www.openssl.org/~appro/cryptogams/.
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# ====================================================================
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# sha1_block procedure for ARMv4.
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#
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# January 2007.
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# Size/performance trade-off
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# ====================================================================
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# impl size in bytes comp cycles[*] measured performance
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# ====================================================================
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# thumb 304 3212 4420
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# armv4-small 392/+29% 1958/+64% 2250/+96%
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# armv4-compact 740/+89% 1552/+26% 1840/+22%
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# armv4-large 1420/+92% 1307/+19% 1370/+34%[***]
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# full unroll ~5100/+260% ~1260/+4% ~1300/+5%
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# ====================================================================
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# thumb = same as 'small' but in Thumb instructions[**] and
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# with recurring code in two private functions;
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# small = detached Xload/update, loops are folded;
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# compact = detached Xload/update, 5x unroll;
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# large = interleaved Xload/update, 5x unroll;
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# full unroll = interleaved Xload/update, full unroll, estimated[!];
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#
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# [*] Manually counted instructions in "grand" loop body. Measured
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# performance is affected by prologue and epilogue overhead,
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# i-cache availability, branch penalties, etc.
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# [**] While each Thumb instruction is twice smaller, they are not as
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# diverse as ARM ones: e.g., there are only two arithmetic
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# instructions with 3 arguments, no [fixed] rotate, addressing
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# modes are limited. As result it takes more instructions to do
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# the same job in Thumb, therefore the code is never twice as
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# small and always slower.
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# [***] which is also ~35% better than compiler generated code. Dual-
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# issue Cortex A8 core was measured to process input block in
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# ~990 cycles.
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# August 2010.
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#
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# Rescheduling for dual-issue pipeline resulted in 13% improvement on
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# Cortex A8 core and in absolute terms ~870 cycles per input block
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# [or 13.6 cycles per byte].
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while (($output=shift) && ($output!~/^\w[\w\-]*\.\w+$/)) {}
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open STDOUT,">$output";
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$ctx="r0";
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$inp="r1";
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$len="r2";
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$a="r3";
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$b="r4";
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$c="r5";
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$d="r6";
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$e="r7";
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$K="r8";
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$t0="r9";
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$t1="r10";
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$t2="r11";
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$t3="r12";
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$Xi="r14";
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@V=($a,$b,$c,$d,$e);
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sub Xupdate {
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my ($a,$b,$c,$d,$e,$opt1,$opt2)=@_;
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$code.=<<___;
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ldr $t0,[$Xi,#15*4]
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ldr $t1,[$Xi,#13*4]
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ldr $t2,[$Xi,#7*4]
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add $e,$K,$e,ror#2 @ E+=K_xx_xx
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ldr $t3,[$Xi,#2*4]
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eor $t0,$t0,$t1
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eor $t2,$t2,$t3
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eor $t1,$c,$d @ F_xx_xx
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mov $t0,$t0,ror#31
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add $e,$e,$a,ror#27 @ E+=ROR(A,27)
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eor $t0,$t0,$t2,ror#31
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$opt1 @ F_xx_xx
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$opt2 @ F_xx_xx
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add $e,$e,$t0 @ E+=X[i]
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str $t0,[$Xi,#-4]!
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___
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}
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sub BODY_00_15 {
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my ($a,$b,$c,$d,$e)=@_;
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$code.=<<___;
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ldrb $t0,[$inp],#4
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ldrb $t1,[$inp,#-1]
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ldrb $t2,[$inp,#-2]
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add $e,$K,$e,ror#2 @ E+=K_00_19
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ldrb $t3,[$inp,#-3]
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add $e,$e,$a,ror#27 @ E+=ROR(A,27)
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orr $t0,$t1,$t0,lsl#24
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eor $t1,$c,$d @ F_xx_xx
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orr $t0,$t0,$t2,lsl#8
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orr $t0,$t0,$t3,lsl#16
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and $t1,$b,$t1,ror#2
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add $e,$e,$t0 @ E+=X[i]
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eor $t1,$t1,$d,ror#2 @ F_00_19(B,C,D)
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str $t0,[$Xi,#-4]!
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add $e,$e,$t1 @ E+=F_00_19(B,C,D)
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___
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}
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sub BODY_16_19 {
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my ($a,$b,$c,$d,$e)=@_;
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&Xupdate(@_,"and $t1,$b,$t1,ror#2");
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$code.=<<___;
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eor $t1,$t1,$d,ror#2 @ F_00_19(B,C,D)
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add $e,$e,$t1 @ E+=F_00_19(B,C,D)
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___
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}
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sub BODY_20_39 {
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my ($a,$b,$c,$d,$e)=@_;
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&Xupdate(@_,"eor $t1,$b,$t1,ror#2");
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$code.=<<___;
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add $e,$e,$t1 @ E+=F_20_39(B,C,D)
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___
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}
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sub BODY_40_59 {
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my ($a,$b,$c,$d,$e)=@_;
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&Xupdate(@_,"and $t1,$b,$t1,ror#2","and $t2,$c,$d");
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$code.=<<___;
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add $e,$e,$t1 @ E+=F_40_59(B,C,D)
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add $e,$e,$t2,ror#2
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___
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}
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$code=<<___;
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.text
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.global sha1_block_data_order
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.type sha1_block_data_order,%function
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.align 2
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sha1_block_data_order:
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stmdb sp!,{r4-r12,lr}
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add $len,$inp,$len,lsl#6 @ $len to point at the end of $inp
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ldmia $ctx,{$a,$b,$c,$d,$e}
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.Lloop:
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ldr $K,.LK_00_19
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mov $Xi,sp
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sub sp,sp,#15*4
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mov $c,$c,ror#30
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mov $d,$d,ror#30
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mov $e,$e,ror#30 @ [6]
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.L_00_15:
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___
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for($i=0;$i<5;$i++) {
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&BODY_00_15(@V); unshift(@V,pop(@V));
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}
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$code.=<<___;
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teq $Xi,sp
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bne .L_00_15 @ [((11+4)*5+2)*3]
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___
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&BODY_00_15(@V); unshift(@V,pop(@V));
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&BODY_16_19(@V); unshift(@V,pop(@V));
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&BODY_16_19(@V); unshift(@V,pop(@V));
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&BODY_16_19(@V); unshift(@V,pop(@V));
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&BODY_16_19(@V); unshift(@V,pop(@V));
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$code.=<<___;
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ldr $K,.LK_20_39 @ [+15+16*4]
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sub sp,sp,#25*4
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cmn sp,#0 @ [+3], clear carry to denote 20_39
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.L_20_39_or_60_79:
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___
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for($i=0;$i<5;$i++) {
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&BODY_20_39(@V); unshift(@V,pop(@V));
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}
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$code.=<<___;
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teq $Xi,sp @ preserve carry
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bne .L_20_39_or_60_79 @ [+((12+3)*5+2)*4]
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bcs .L_done @ [+((12+3)*5+2)*4], spare 300 bytes
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ldr $K,.LK_40_59
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sub sp,sp,#20*4 @ [+2]
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.L_40_59:
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___
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for($i=0;$i<5;$i++) {
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&BODY_40_59(@V); unshift(@V,pop(@V));
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}
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$code.=<<___;
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teq $Xi,sp
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bne .L_40_59 @ [+((12+5)*5+2)*4]
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ldr $K,.LK_60_79
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sub sp,sp,#20*4
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cmp sp,#0 @ set carry to denote 60_79
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b .L_20_39_or_60_79 @ [+4], spare 300 bytes
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.L_done:
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add sp,sp,#80*4 @ "deallocate" stack frame
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ldmia $ctx,{$K,$t0,$t1,$t2,$t3}
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add $a,$K,$a
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add $b,$t0,$b
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add $c,$t1,$c,ror#2
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add $d,$t2,$d,ror#2
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add $e,$t3,$e,ror#2
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stmia $ctx,{$a,$b,$c,$d,$e}
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teq $inp,$len
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bne .Lloop @ [+18], total 1307
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ldmia sp!,{r4-r12,lr}
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tst lr,#1
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moveq pc,lr @ be binary compatible with V4, yet
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bx lr @ interoperable with Thumb ISA:-)
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.align 2
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.LK_00_19: .word 0x5a827999
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.LK_20_39: .word 0x6ed9eba1
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.LK_40_59: .word 0x8f1bbcdc
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.LK_60_79: .word 0xca62c1d6
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.size sha1_block_data_order,.-sha1_block_data_order
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.asciz "SHA1 block transform for ARMv4, CRYPTOGAMS by <appro\@openssl.org>"
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.align 2
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___
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$code =~ s/\bbx\s+lr\b/.word\t0xe12fff1e/gm; # make it possible to compile with -march=armv4
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print $code;
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close STDOUT; # enforce flush
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