--- /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/.
+# ====================================================================
+#
+# February 2009
+#
+# Performance is 2x of gcc 3.4.6 on z10. Coding "secret" is to
+# "cluster" Address Generation Interlocks, so that one pipeline stall
+# resolves several dependencies.
+
+# November 2010.
+#
+# Adapt for -m31 build. If kernel supports what's called "highgprs"
+# feature on Linux [see /proc/cpuinfo], it's possible to use 64-bit
+# instructions and achieve "64-bit" performance even in 31-bit legacy
+# application context. The feature is not specific to any particular
+# processor, as long as it's "z-CPU". Latter implies that the code
+# remains z/Architecture specific. On z990 it was measured to perform
+# 50% better than code generated by gcc 4.3.
+
+$flavour = shift;
+
+if ($flavour =~ /3[12]/) {
+ $SIZE_T=4;
+ $g="";
+} else {
+ $SIZE_T=8;
+ $g="g";
+}
+
+while (($output=shift) && ($output!~/^\w[\w\-]*\.\w+$/)) {}
+open STDOUT,">$output";
+
+$rp="%r14";
+$sp="%r15";
+$code=<<___;
+.text
+
+___
+
+# void RC4(RC4_KEY *key,size_t len,const void *inp,void *out)
+{
+$acc="%r0";
+$cnt="%r1";
+$key="%r2";
+$len="%r3";
+$inp="%r4";
+$out="%r5";
+
+@XX=("%r6","%r7");
+@TX=("%r8","%r9");
+$YY="%r10";
+$TY="%r11";
+
+$code.=<<___;
+.globl RC4
+.type RC4,\@function
+.align 64
+RC4:
+ stm${g} %r6,%r11,6*$SIZE_T($sp)
+___
+$code.=<<___ if ($flavour =~ /3[12]/);
+ llgfr $len,$len
+___
+$code.=<<___;
+ llgc $XX[0],0($key)
+ llgc $YY,1($key)
+ la $XX[0],1($XX[0])
+ nill $XX[0],0xff
+ srlg $cnt,$len,3
+ ltgr $cnt,$cnt
+ llgc $TX[0],2($XX[0],$key)
+ jz .Lshort
+ j .Loop8
+
+.align 64
+.Loop8:
+___
+for ($i=0;$i<8;$i++) {
+$code.=<<___;
+ la $YY,0($YY,$TX[0]) # $i
+ nill $YY,255
+ la $XX[1],1($XX[0])
+ nill $XX[1],255
+___
+$code.=<<___ if ($i==1);
+ llgc $acc,2($TY,$key)
+___
+$code.=<<___ if ($i>1);
+ sllg $acc,$acc,8
+ ic $acc,2($TY,$key)
+___
+$code.=<<___;
+ llgc $TY,2($YY,$key)
+ stc $TX[0],2($YY,$key)
+ llgc $TX[1],2($XX[1],$key)
+ stc $TY,2($XX[0],$key)
+ cr $XX[1],$YY
+ jne .Lcmov$i
+ la $TX[1],0($TX[0])
+.Lcmov$i:
+ la $TY,0($TY,$TX[0])
+ nill $TY,255
+___
+push(@TX,shift(@TX)); push(@XX,shift(@XX)); # "rotate" registers
+}
+
+$code.=<<___;
+ lg $TX[1],0($inp)
+ sllg $acc,$acc,8
+ la $inp,8($inp)
+ ic $acc,2($TY,$key)
+ xgr $acc,$TX[1]
+ stg $acc,0($out)
+ la $out,8($out)
+ brctg $cnt,.Loop8
+
+.Lshort:
+ lghi $acc,7
+ ngr $len,$acc
+ jz .Lexit
+ j .Loop1
+
+.align 16
+.Loop1:
+ la $YY,0($YY,$TX[0])
+ nill $YY,255
+ llgc $TY,2($YY,$key)
+ stc $TX[0],2($YY,$key)
+ stc $TY,2($XX[0],$key)
+ ar $TY,$TX[0]
+ ahi $XX[0],1
+ nill $TY,255
+ nill $XX[0],255
+ llgc $acc,0($inp)
+ la $inp,1($inp)
+ llgc $TY,2($TY,$key)
+ llgc $TX[0],2($XX[0],$key)
+ xr $acc,$TY
+ stc $acc,0($out)
+ la $out,1($out)
+ brct $len,.Loop1
+
+.Lexit:
+ ahi $XX[0],-1
+ stc $XX[0],0($key)
+ stc $YY,1($key)
+ lm${g} %r6,%r11,6*$SIZE_T($sp)
+ br $rp
+.size RC4,.-RC4
+.string "RC4 for s390x, CRYPTOGAMS by <appro\@openssl.org>"
+
+___
+}
+
+# void RC4_set_key(RC4_KEY *key,unsigned int len,const void *inp)
+{
+$cnt="%r0";
+$idx="%r1";
+$key="%r2";
+$len="%r3";
+$inp="%r4";
+$acc="%r5";
+$dat="%r6";
+$ikey="%r7";
+$iinp="%r8";
+
+$code.=<<___;
+.globl private_RC4_set_key
+.type private_RC4_set_key,\@function
+.align 64
+private_RC4_set_key:
+ stm${g} %r6,%r8,6*$SIZE_T($sp)
+ lhi $cnt,256
+ la $idx,0(%r0)
+ sth $idx,0($key)
+.align 4
+.L1stloop:
+ stc $idx,2($idx,$key)
+ la $idx,1($idx)
+ brct $cnt,.L1stloop
+
+ lghi $ikey,-256
+ lr $cnt,$len
+ la $iinp,0(%r0)
+ la $idx,0(%r0)
+.align 16
+.L2ndloop:
+ llgc $acc,2+256($ikey,$key)
+ llgc $dat,0($iinp,$inp)
+ la $idx,0($idx,$acc)
+ la $ikey,1($ikey)
+ la $idx,0($idx,$dat)
+ nill $idx,255
+ la $iinp,1($iinp)
+ tml $ikey,255
+ llgc $dat,2($idx,$key)
+ stc $dat,2+256-1($ikey,$key)
+ stc $acc,2($idx,$key)
+ jz .Ldone
+ brct $cnt,.L2ndloop
+ lr $cnt,$len
+ la $iinp,0(%r0)
+ j .L2ndloop
+.Ldone:
+ lm${g} %r6,%r8,6*$SIZE_T($sp)
+ br $rp
+.size private_RC4_set_key,.-private_RC4_set_key
+
+___
+}
+
+# const char *RC4_options()
+$code.=<<___;
+.globl RC4_options
+.type RC4_options,\@function
+.align 16
+RC4_options:
+ larl %r2,.Loptions
+ br %r14
+.size RC4_options,.-RC4_options
+.section .rodata
+.Loptions:
+.align 8
+.string "rc4(8x,char)"
+___
+
+print $code;
+close STDOUT; # force flush
projects / cassiopeia.git / blobdiff