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| #! /usr/bin/env perl
| # Copyright 2009-2020 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/.
| # ====================================================================
| #
| # 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";
|
| $code.=<<___;
| .globl RC4_set_key
| .type RC4_set_key,\@function
| .align 64
| RC4_set_key:
| stm${g} %r6,%r8,6*$SIZE_T($sp)
| lhi $cnt,256
| la $idx,0
| 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
| la $idx,0
| .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 $iinp,0
| j .L2ndloop
| .Ldone:
| lm${g} %r6,%r8,6*$SIZE_T($sp)
| br $rp
| .size RC4_set_key,.-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 or die "error closing STDOUT: $!"; # force flush
|
|
