--- /dev/null
+#!/usr/bin/env perl
+
+# ====================================================================
+# Written by Andy Polyakov <appro@fy.chalmers.se> 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 procedure for ARMv4.
+#
+# January 2007.
+
+# Size/performance trade-off
+# ====================================================================
+# impl size in bytes comp cycles[*] measured performance
+# ====================================================================
+# thumb 304 3212 4420
+# armv4-small 392/+29% 1958/+64% 2250/+96%
+# armv4-compact 740/+89% 1552/+26% 1840/+22%
+# armv4-large 1420/+92% 1307/+19% 1370/+34%[***]
+# full unroll ~5100/+260% ~1260/+4% ~1300/+5%
+# ====================================================================
+# thumb = same as 'small' but in Thumb instructions[**] and
+# with recurring code in two private functions;
+# small = detached Xload/update, loops are folded;
+# compact = detached Xload/update, 5x unroll;
+# large = interleaved Xload/update, 5x unroll;
+# full unroll = interleaved Xload/update, full unroll, estimated[!];
+#
+# [*] Manually counted instructions in "grand" loop body. Measured
+# performance is affected by prologue and epilogue overhead,
+# i-cache availability, branch penalties, etc.
+# [**] While each Thumb instruction is twice smaller, they are not as
+# diverse as ARM ones: e.g., there are only two arithmetic
+# instructions with 3 arguments, no [fixed] rotate, addressing
+# modes are limited. As result it takes more instructions to do
+# the same job in Thumb, therefore the code is never twice as
+# small and always slower.
+# [***] which is also ~35% better than compiler generated code. Dual-
+# issue Cortex A8 core was measured to process input block in
+# ~990 cycles.
+
+# August 2010.
+#
+# Rescheduling for dual-issue pipeline resulted in 13% improvement on
+# Cortex A8 core and in absolute terms ~870 cycles per input block
+# [or 13.6 cycles per byte].
+
+# February 2011.
+#
+# Profiler-assisted and platform-specific optimization resulted in 10%
+# improvement on Cortex A8 core and 12.2 cycles per byte.
+
+while (($output=shift) && ($output!~/^\w[\w\-]*\.\w+$/)) {}
+open STDOUT,">$output";
+
+$ctx="r0";
+$inp="r1";
+$len="r2";
+$a="r3";
+$b="r4";
+$c="r5";
+$d="r6";
+$e="r7";
+$K="r8";
+$t0="r9";
+$t1="r10";
+$t2="r11";
+$t3="r12";
+$Xi="r14";
+@V=($a,$b,$c,$d,$e);
+
+sub Xupdate {
+my ($a,$b,$c,$d,$e,$opt1,$opt2)=@_;
+$code.=<<___;
+ ldr $t0,[$Xi,#15*4]
+ ldr $t1,[$Xi,#13*4]
+ ldr $t2,[$Xi,#7*4]
+ add $e,$K,$e,ror#2 @ E+=K_xx_xx
+ ldr $t3,[$Xi,#2*4]
+ eor $t0,$t0,$t1
+ eor $t2,$t2,$t3 @ 1 cycle stall
+ eor $t1,$c,$d @ F_xx_xx
+ mov $t0,$t0,ror#31
+ add $e,$e,$a,ror#27 @ E+=ROR(A,27)
+ eor $t0,$t0,$t2,ror#31
+ str $t0,[$Xi,#-4]!
+ $opt1 @ F_xx_xx
+ $opt2 @ F_xx_xx
+ add $e,$e,$t0 @ E+=X[i]
+___
+}
+
+sub BODY_00_15 {
+my ($a,$b,$c,$d,$e)=@_;
+$code.=<<___;
+#if __ARM_ARCH__<7
+ ldrb $t1,[$inp,#2]
+ ldrb $t0,[$inp,#3]
+ ldrb $t2,[$inp,#1]
+ add $e,$K,$e,ror#2 @ E+=K_00_19
+ ldrb $t3,[$inp],#4
+ orr $t0,$t0,$t1,lsl#8
+ eor $t1,$c,$d @ F_xx_xx
+ orr $t0,$t0,$t2,lsl#16
+ add $e,$e,$a,ror#27 @ E+=ROR(A,27)
+ orr $t0,$t0,$t3,lsl#24
+#else
+ ldr $t0,[$inp],#4 @ handles unaligned
+ add $e,$K,$e,ror#2 @ E+=K_00_19
+ eor $t1,$c,$d @ F_xx_xx
+ add $e,$e,$a,ror#27 @ E+=ROR(A,27)
+#ifdef __ARMEL__
+ rev $t0,$t0 @ byte swap
+#endif
+#endif
+ and $t1,$b,$t1,ror#2
+ add $e,$e,$t0 @ E+=X[i]
+ eor $t1,$t1,$d,ror#2 @ F_00_19(B,C,D)
+ str $t0,[$Xi,#-4]!
+ add $e,$e,$t1 @ E+=F_00_19(B,C,D)
+___
+}
+
+sub BODY_16_19 {
+my ($a,$b,$c,$d,$e)=@_;
+ &Xupdate(@_,"and $t1,$b,$t1,ror#2");
+$code.=<<___;
+ eor $t1,$t1,$d,ror#2 @ F_00_19(B,C,D)
+ add $e,$e,$t1 @ E+=F_00_19(B,C,D)
+___
+}
+
+sub BODY_20_39 {
+my ($a,$b,$c,$d,$e)=@_;
+ &Xupdate(@_,"eor $t1,$b,$t1,ror#2");
+$code.=<<___;
+ add $e,$e,$t1 @ E+=F_20_39(B,C,D)
+___
+}
+
+sub BODY_40_59 {
+my ($a,$b,$c,$d,$e)=@_;
+ &Xupdate(@_,"and $t1,$b,$t1,ror#2","and $t2,$c,$d");
+$code.=<<___;
+ add $e,$e,$t1 @ E+=F_40_59(B,C,D)
+ add $e,$e,$t2,ror#2
+___
+}
+
+$code=<<___;
+#include "arm_arch.h"
+
+.text
+
+.global sha1_block_data_order
+.type sha1_block_data_order,%function
+
+.align 2
+sha1_block_data_order:
+ stmdb sp!,{r4-r12,lr}
+ add $len,$inp,$len,lsl#6 @ $len to point at the end of $inp
+ ldmia $ctx,{$a,$b,$c,$d,$e}
+.Lloop:
+ ldr $K,.LK_00_19
+ mov $Xi,sp
+ sub sp,sp,#15*4
+ mov $c,$c,ror#30
+ mov $d,$d,ror#30
+ mov $e,$e,ror#30 @ [6]
+.L_00_15:
+___
+for($i=0;$i<5;$i++) {
+ &BODY_00_15(@V); unshift(@V,pop(@V));
+}
+$code.=<<___;
+ teq $Xi,sp
+ bne .L_00_15 @ [((11+4)*5+2)*3]
+ sub sp,sp,#25*4
+___
+ &BODY_00_15(@V); unshift(@V,pop(@V));
+ &BODY_16_19(@V); unshift(@V,pop(@V));
+ &BODY_16_19(@V); unshift(@V,pop(@V));
+ &BODY_16_19(@V); unshift(@V,pop(@V));
+ &BODY_16_19(@V); unshift(@V,pop(@V));
+$code.=<<___;
+
+ ldr $K,.LK_20_39 @ [+15+16*4]
+ cmn sp,#0 @ [+3], clear carry to denote 20_39
+.L_20_39_or_60_79:
+___
+for($i=0;$i<5;$i++) {
+ &BODY_20_39(@V); unshift(@V,pop(@V));
+}
+$code.=<<___;
+ teq $Xi,sp @ preserve carry
+ bne .L_20_39_or_60_79 @ [+((12+3)*5+2)*4]
+ bcs .L_done @ [+((12+3)*5+2)*4], spare 300 bytes
+
+ ldr $K,.LK_40_59
+ sub sp,sp,#20*4 @ [+2]
+.L_40_59:
+___
+for($i=0;$i<5;$i++) {
+ &BODY_40_59(@V); unshift(@V,pop(@V));
+}
+$code.=<<___;
+ teq $Xi,sp
+ bne .L_40_59 @ [+((12+5)*5+2)*4]
+
+ ldr $K,.LK_60_79
+ sub sp,sp,#20*4
+ cmp sp,#0 @ set carry to denote 60_79
+ b .L_20_39_or_60_79 @ [+4], spare 300 bytes
+.L_done:
+ add sp,sp,#80*4 @ "deallocate" stack frame
+ ldmia $ctx,{$K,$t0,$t1,$t2,$t3}
+ add $a,$K,$a
+ add $b,$t0,$b
+ add $c,$t1,$c,ror#2
+ add $d,$t2,$d,ror#2
+ add $e,$t3,$e,ror#2
+ stmia $ctx,{$a,$b,$c,$d,$e}
+ teq $inp,$len
+ bne .Lloop @ [+18], total 1307
+
+#if __ARM_ARCH__>=5
+ ldmia sp!,{r4-r12,pc}
+#else
+ ldmia sp!,{r4-r12,lr}
+ tst lr,#1
+ moveq pc,lr @ be binary compatible with V4, yet
+ bx lr @ interoperable with Thumb ISA:-)
+#endif
+.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 ARMv4, CRYPTOGAMS by <appro\@openssl.org>"
+.align 2
+___
+
+$code =~ s/\bbx\s+lr\b/.word\t0xe12fff1e/gm; # make it possible to compile with -march=armv4
+print $code;
+close STDOUT; # enforce flush
projects / cassiopeia.git / blobdiff