337 lines
6.9 KiB
Perl
337 lines
6.9 KiB
Perl
#!/usr/bin/env perl
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#
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# ====================================================================
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# Written by Andy Polyakov <appro@openssl.org> 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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#
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# March 2010
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#
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# The module implements "4-bit" GCM GHASH function and underlying
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# single multiplication operation in GF(2^128). "4-bit" means that it
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# uses 256 bytes per-key table [+128 bytes shared table]. Performance
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# results are for streamed GHASH subroutine and are expressed in
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# cycles per processed byte, less is better:
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#
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# gcc 3.4.x assembler
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#
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# Opteron 18.5 10.2 +80%
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# Core2 26.0 16.4 +58%
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$flavour = shift;
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$output = shift;
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if ($flavour =~ /\./) { $output = $flavour; undef $flavour; }
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$win64=0; $win64=1 if ($flavour =~ /[nm]asm|mingw64/ || $output =~ /\.asm$/);
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$0 =~ m/(.*[\/\\])[^\/\\]+$/; $dir=$1;
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( $xlate="${dir}x86_64-xlate.pl" and -f $xlate ) or
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( $xlate="${dir}../../perlasm/x86_64-xlate.pl" and -f $xlate) or
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die "can't locate x86_64-xlate.pl";
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open STDOUT,"| $^X $xlate $flavour $output";
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# common register layout
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$nlo="%rax";
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$nhi="%rbx";
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$Zlo="%r8";
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$Zhi="%r9";
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$tmp="%r10";
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$rem_4bit = "%r11";
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# per-function register layout
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$Xi="%rdi";
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$Htbl="%rsi";
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$cnt="%rcx";
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$rem="%rdx";
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sub lo() { my $r=shift; $r =~ s/%[er]([a-d])x/%\1l/;
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$r =~ s/%[er]([sd]i)/%\1l/;
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$r =~ s/%(r[0-9]+)[d]?/%\1b/; $r; }
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{ my $N;
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sub loop() {
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my $inp = shift;
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$N++;
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$code.=<<___;
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xor $nlo,$nlo
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xor $nhi,$nhi
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mov `&lo("$Zlo")`,`&lo("$nlo")`
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mov `&lo("$Zlo")`,`&lo("$nhi")`
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shl \$4,`&lo("$nlo")`
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mov \$14,$cnt
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mov 8($Htbl,$nlo),$Zlo
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mov ($Htbl,$nlo),$Zhi
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and \$0xf0,`&lo("$nhi")`
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mov $Zlo,$rem
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jmp .Loop$N
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.align 16
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.Loop$N:
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shr \$4,$Zlo
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and \$0xf,$rem
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mov $Zhi,$tmp
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mov ($inp,$cnt),`&lo("$nlo")`
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shr \$4,$Zhi
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xor 8($Htbl,$nhi),$Zlo
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shl \$60,$tmp
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xor ($Htbl,$nhi),$Zhi
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mov `&lo("$nlo")`,`&lo("$nhi")`
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xor ($rem_4bit,$rem,8),$Zhi
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mov $Zlo,$rem
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shl \$4,`&lo("$nlo")`
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xor $tmp,$Zlo
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dec $cnt
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js .Lbreak$N
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shr \$4,$Zlo
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and \$0xf,$rem
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mov $Zhi,$tmp
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shr \$4,$Zhi
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xor 8($Htbl,$nlo),$Zlo
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shl \$60,$tmp
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xor ($Htbl,$nlo),$Zhi
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and \$0xf0,`&lo("$nhi")`
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xor ($rem_4bit,$rem,8),$Zhi
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mov $Zlo,$rem
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xor $tmp,$Zlo
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jmp .Loop$N
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.align 16
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.Lbreak$N:
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shr \$4,$Zlo
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and \$0xf,$rem
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mov $Zhi,$tmp
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shr \$4,$Zhi
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xor 8($Htbl,$nlo),$Zlo
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shl \$60,$tmp
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xor ($Htbl,$nlo),$Zhi
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and \$0xf0,`&lo("$nhi")`
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xor ($rem_4bit,$rem,8),$Zhi
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mov $Zlo,$rem
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xor $tmp,$Zlo
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shr \$4,$Zlo
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and \$0xf,$rem
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mov $Zhi,$tmp
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shr \$4,$Zhi
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xor 8($Htbl,$nhi),$Zlo
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shl \$60,$tmp
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xor ($Htbl,$nhi),$Zhi
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xor $tmp,$Zlo
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xor ($rem_4bit,$rem,8),$Zhi
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bswap $Zlo
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bswap $Zhi
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___
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}}
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$code=<<___;
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.text
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.globl gcm_gmult_4bit
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.type gcm_gmult_4bit,\@function,2
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.align 16
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gcm_gmult_4bit:
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push %rbx
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push %rbp # %rbp and %r12 are pushed exclusively in
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push %r12 # order to reuse Win64 exception handler...
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.Lgmult_prologue:
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movzb 15($Xi),$Zlo
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lea .Lrem_4bit(%rip),$rem_4bit
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___
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&loop ($Xi);
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$code.=<<___;
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mov $Zlo,8($Xi)
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mov $Zhi,($Xi)
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mov 16(%rsp),%rbx
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lea 24(%rsp),%rsp
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.Lgmult_epilogue:
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ret
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.size gcm_gmult_4bit,.-gcm_gmult_4bit
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___
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# per-function register layout
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$inp="%rdi";
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$len="%rsi";
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$Xi="%rdx";
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$Htbl="%rcx";
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$cnt="%rbp";
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$rem="%r12";
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$code.=<<___;
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.globl gcm_ghash_4bit
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.type gcm_ghash_4bit,\@function,4
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.align 16
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gcm_ghash_4bit:
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push %rbx
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push %rbp
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push %r12
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.Lghash_prologue:
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mov 8($Xi),$Zlo
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mov ($Xi),$Zhi
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add $inp,$len
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lea .Lrem_4bit(%rip),$rem_4bit
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.align 4
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.Louter_loop:
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xor 8($inp),$Zlo
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xor ($inp),$Zhi
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lea 16($inp),$inp
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mov $Zlo,8($Xi)
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mov $Zhi,($Xi)
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shr \$56,$Zlo
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___
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&loop ($Xi);
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$code.=<<___;
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cmp $len,$inp
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jb .Louter_loop
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mov $Zlo,8($Xi)
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mov $Zhi,($Xi)
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mov 0(%rsp),%r12
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mov 8(%rsp),%rbp
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mov 16(%rsp),%rbx
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lea 24(%rsp),%rsp
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.Lghash_epilogue:
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ret
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.size gcm_ghash_4bit,.-gcm_ghash_4bit
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.align 64
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.type rem_4bit,\@object
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.Lrem_4bit:
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.long 0,`0x0000<<16`,0,`0x1C20<<16`,0,`0x3840<<16`,0,`0x2460<<16`
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.long 0,`0x7080<<16`,0,`0x6CA0<<16`,0,`0x48C0<<16`,0,`0x54E0<<16`
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.long 0,`0xE100<<16`,0,`0xFD20<<16`,0,`0xD940<<16`,0,`0xC560<<16`
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.long 0,`0x9180<<16`,0,`0x8DA0<<16`,0,`0xA9C0<<16`,0,`0xB5E0<<16`
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.asciz "GHASH for x86_64, CRYPTOGAMS by <appro\@openssl.org>"
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.align 64
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___
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# EXCEPTION_DISPOSITION handler (EXCEPTION_RECORD *rec,ULONG64 frame,
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# CONTEXT *context,DISPATCHER_CONTEXT *disp)
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if ($win64) {
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$rec="%rcx";
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$frame="%rdx";
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$context="%r8";
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$disp="%r9";
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$code.=<<___;
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.extern __imp_RtlVirtualUnwind
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.type se_handler,\@abi-omnipotent
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.align 16
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se_handler:
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push %rsi
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push %rdi
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push %rbx
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push %rbp
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push %r12
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push %r13
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push %r14
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push %r15
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pushfq
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sub \$64,%rsp
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mov 120($context),%rax # pull context->Rax
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mov 248($context),%rbx # pull context->Rip
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mov 8($disp),%rsi # disp->ImageBase
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mov 56($disp),%r11 # disp->HandlerData
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mov 0(%r11),%r10d # HandlerData[0]
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lea (%rsi,%r10),%r10 # prologue label
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cmp %r10,%rbx # context->Rip<prologue label
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jb .Lin_prologue
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mov 152($context),%rax # pull context->Rsp
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mov 4(%r11),%r10d # HandlerData[1]
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lea (%rsi,%r10),%r10 # epilogue label
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cmp %r10,%rbx # context->Rip>=epilogue label
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jae .Lin_prologue
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lea 24(%rax),%rax # adjust "rsp"
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mov -8(%rax),%rbx
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mov -16(%rax),%rbp
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mov -24(%rax),%r12
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mov %rbx,144($context) # restore context->Rbx
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mov %rbp,160($context) # restore context->Rbp
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mov %r12,216($context) # restore context->R12
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.Lin_prologue:
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mov 8(%rax),%rdi
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mov 16(%rax),%rsi
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mov %rax,152($context) # restore context->Rsp
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mov %rsi,168($context) # restore context->Rsi
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mov %rdi,176($context) # restore context->Rdi
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mov 40($disp),%rdi # disp->ContextRecord
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mov $context,%rsi # context
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mov \$`1232/8`,%ecx # sizeof(CONTEXT)
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.long 0xa548f3fc # cld; rep movsq
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mov $disp,%rsi
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xor %rcx,%rcx # arg1, UNW_FLAG_NHANDLER
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mov 8(%rsi),%rdx # arg2, disp->ImageBase
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mov 0(%rsi),%r8 # arg3, disp->ControlPc
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mov 16(%rsi),%r9 # arg4, disp->FunctionEntry
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mov 40(%rsi),%r10 # disp->ContextRecord
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lea 56(%rsi),%r11 # &disp->HandlerData
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lea 24(%rsi),%r12 # &disp->EstablisherFrame
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mov %r10,32(%rsp) # arg5
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mov %r11,40(%rsp) # arg6
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mov %r12,48(%rsp) # arg7
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mov %rcx,56(%rsp) # arg8, (NULL)
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call *__imp_RtlVirtualUnwind(%rip)
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mov \$1,%eax # ExceptionContinueSearch
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add \$64,%rsp
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popfq
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pop %r15
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pop %r14
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pop %r13
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pop %r12
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pop %rbp
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pop %rbx
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pop %rdi
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pop %rsi
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ret
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.size se_handler,.-se_handler
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.section .pdata
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.align 4
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.rva .LSEH_begin_gcm_gmult_4bit
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.rva .LSEH_end_gcm_gmult_4bit
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.rva .LSEH_info_gcm_gmult_4bit
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.rva .LSEH_begin_gcm_ghash_4bit
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.rva .LSEH_end_gcm_ghash_4bit
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.rva .LSEH_info_gcm_ghash_4bit
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.section .xdata
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.align 8
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.LSEH_info_gcm_gmult_4bit:
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.byte 9,0,0,0
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.rva se_handler
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.rva .Lgmult_prologue,.Lgmult_epilogue # HandlerData
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.LSEH_info_gcm_ghash_4bit:
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.byte 9,0,0,0
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.rva se_handler
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.rva .Lghash_prologue,.Lghash_epilogue # HandlerData
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___
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}
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$code =~ s/\`([^\`]*)\`/eval($1)/gem;
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print $code;
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close STDOUT;
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