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331 lines
7.0 KiB
331 lines
7.0 KiB
14 years ago
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#!/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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# October 2005.
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#
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# Montgomery multiplication routine for x86_64. While it gives modest
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# 9% improvement of rsa4096 sign on Opteron, rsa512 sign runs more
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# than twice, >2x, as fast. Most common rsa1024 sign is improved by
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# respectful 50%. It remains to be seen if loop unrolling and
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# dedicated squaring routine can provide further improvement...
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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 $output";
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# int bn_mul_mont(
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$rp="%rdi"; # BN_ULONG *rp,
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$ap="%rsi"; # const BN_ULONG *ap,
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$bp="%rdx"; # const BN_ULONG *bp,
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$np="%rcx"; # const BN_ULONG *np,
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$n0="%r8"; # const BN_ULONG *n0,
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$num="%r9"; # int num);
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$lo0="%r10";
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$hi0="%r11";
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$bp="%r12"; # reassign $bp
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$hi1="%r13";
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$i="%r14";
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$j="%r15";
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$m0="%rbx";
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$m1="%rbp";
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$code=<<___;
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.text
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.globl bn_mul_mont
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.type bn_mul_mont,\@function,6
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.align 16
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bn_mul_mont:
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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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mov ${num}d,${num}d
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lea 2($num),%r10
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mov %rsp,%r11
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neg %r10
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lea (%rsp,%r10,8),%rsp # tp=alloca(8*(num+2))
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and \$-1024,%rsp # minimize TLB usage
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mov %r11,8(%rsp,$num,8) # tp[num+1]=%rsp
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.Lprologue:
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mov %rdx,$bp # $bp reassigned, remember?
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mov ($n0),$n0 # pull n0[0] value
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xor $i,$i # i=0
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xor $j,$j # j=0
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mov ($bp),$m0 # m0=bp[0]
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mov ($ap),%rax
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mulq $m0 # ap[0]*bp[0]
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mov %rax,$lo0
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mov %rdx,$hi0
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imulq $n0,%rax # "tp[0]"*n0
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mov %rax,$m1
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mulq ($np) # np[0]*m1
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add $lo0,%rax # discarded
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adc \$0,%rdx
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mov %rdx,$hi1
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lea 1($j),$j # j++
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.L1st:
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mov ($ap,$j,8),%rax
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mulq $m0 # ap[j]*bp[0]
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add $hi0,%rax
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adc \$0,%rdx
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mov %rax,$lo0
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mov ($np,$j,8),%rax
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mov %rdx,$hi0
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mulq $m1 # np[j]*m1
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add $hi1,%rax
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lea 1($j),$j # j++
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adc \$0,%rdx
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add $lo0,%rax # np[j]*m1+ap[j]*bp[0]
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adc \$0,%rdx
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mov %rax,-16(%rsp,$j,8) # tp[j-1]
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cmp $num,$j
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mov %rdx,$hi1
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jl .L1st
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xor %rdx,%rdx
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add $hi0,$hi1
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adc \$0,%rdx
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mov $hi1,-8(%rsp,$num,8)
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mov %rdx,(%rsp,$num,8) # store upmost overflow bit
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lea 1($i),$i # i++
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.align 4
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.Louter:
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xor $j,$j # j=0
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mov ($bp,$i,8),$m0 # m0=bp[i]
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mov ($ap),%rax # ap[0]
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mulq $m0 # ap[0]*bp[i]
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add (%rsp),%rax # ap[0]*bp[i]+tp[0]
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adc \$0,%rdx
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mov %rax,$lo0
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mov %rdx,$hi0
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imulq $n0,%rax # tp[0]*n0
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mov %rax,$m1
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mulq ($np,$j,8) # np[0]*m1
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add $lo0,%rax # discarded
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mov 8(%rsp),$lo0 # tp[1]
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adc \$0,%rdx
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mov %rdx,$hi1
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lea 1($j),$j # j++
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.align 4
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.Linner:
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mov ($ap,$j,8),%rax
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mulq $m0 # ap[j]*bp[i]
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add $hi0,%rax
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adc \$0,%rdx
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add %rax,$lo0 # ap[j]*bp[i]+tp[j]
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mov ($np,$j,8),%rax
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adc \$0,%rdx
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mov %rdx,$hi0
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mulq $m1 # np[j]*m1
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add $hi1,%rax
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lea 1($j),$j # j++
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adc \$0,%rdx
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add $lo0,%rax # np[j]*m1+ap[j]*bp[i]+tp[j]
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adc \$0,%rdx
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mov (%rsp,$j,8),$lo0
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cmp $num,$j
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mov %rax,-16(%rsp,$j,8) # tp[j-1]
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mov %rdx,$hi1
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jl .Linner
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xor %rdx,%rdx
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add $hi0,$hi1
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adc \$0,%rdx
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add $lo0,$hi1 # pull upmost overflow bit
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adc \$0,%rdx
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mov $hi1,-8(%rsp,$num,8)
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mov %rdx,(%rsp,$num,8) # store upmost overflow bit
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lea 1($i),$i # i++
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cmp $num,$i
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jl .Louter
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lea (%rsp),$ap # borrow ap for tp
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lea -1($num),$j # j=num-1
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mov ($ap),%rax # tp[0]
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xor $i,$i # i=0 and clear CF!
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jmp .Lsub
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.align 16
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.Lsub: sbb ($np,$i,8),%rax
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mov %rax,($rp,$i,8) # rp[i]=tp[i]-np[i]
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dec $j # doesn't affect CF!
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mov 8($ap,$i,8),%rax # tp[i+1]
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lea 1($i),$i # i++
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jge .Lsub
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sbb \$0,%rax # handle upmost overflow bit
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and %rax,$ap
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not %rax
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mov $rp,$np
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and %rax,$np
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lea -1($num),$j
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or $np,$ap # ap=borrow?tp:rp
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.align 16
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.Lcopy: # copy or in-place refresh
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mov ($ap,$j,8),%rax
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mov %rax,($rp,$j,8) # rp[i]=tp[i]
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mov $i,(%rsp,$j,8) # zap temporary vector
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dec $j
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jge .Lcopy
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mov 8(%rsp,$num,8),%rsi # restore %rsp
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mov \$1,%rax
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mov (%rsi),%r15
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mov 8(%rsi),%r14
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mov 16(%rsi),%r13
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mov 24(%rsi),%r12
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mov 32(%rsi),%rbp
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mov 40(%rsi),%rbx
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lea 48(%rsi),%rsp
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.Lepilogue:
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ret
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.size bn_mul_mont,.-bn_mul_mont
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.asciz "Montgomery Multiplication for x86_64, CRYPTOGAMS by <appro\@openssl.org>"
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.align 16
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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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lea .Lprologue(%rip),%r10
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cmp %r10,%rbx # context->Rip<.Lprologue
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jb .Lin_prologue
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mov 152($context),%rax # pull context->Rsp
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lea .Lepilogue(%rip),%r10
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cmp %r10,%rbx # context->Rip>=.Lepilogue
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jae .Lin_prologue
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mov 192($context),%r10 # pull $num
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mov 8(%rax,%r10,8),%rax # pull saved stack pointer
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lea 48(%rax),%rax
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mov -8(%rax),%rbx
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mov -16(%rax),%rbp
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mov -24(%rax),%r12
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mov -32(%rax),%r13
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mov -40(%rax),%r14
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mov -48(%rax),%r15
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mov %rbx,144($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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mov %r13,224($context) # restore context->R13
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mov %r14,232($context) # restore context->R14
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mov %r15,240($context) # restore context->R15
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.Lin_prologue:
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mov 8(%rax),%rdi
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mov 16(%rax),%rsi
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mov %rax,152($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 \$154,%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_bn_mul_mont
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.rva .LSEH_end_bn_mul_mont
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.rva .LSEH_info_bn_mul_mont
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.section .xdata
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.align 8
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.LSEH_info_bn_mul_mont:
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.byte 9,0,0,0
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.rva se_handler
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___
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}
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print $code;
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close STDOUT;
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