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OpenBoard/thirdparty/openssl/openssl-1.0.0d/crypto/bn/asm/x86_64-mont.pl

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7.0 KiB

#!/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/.
# ====================================================================
# October 2005.
#
# Montgomery multiplication routine for x86_64. While it gives modest
# 9% improvement of rsa4096 sign on Opteron, rsa512 sign runs more
# than twice, >2x, as fast. Most common rsa1024 sign is improved by
# respectful 50%. It remains to be seen if loop unrolling and
# dedicated squaring routine can provide further improvement...
$flavour = shift;
$output = shift;
if ($flavour =~ /\./) { $output = $flavour; undef $flavour; }
$win64=0; $win64=1 if ($flavour =~ /[nm]asm|mingw64/ || $output =~ /\.asm$/);
$0 =~ m/(.*[\/\\])[^\/\\]+$/; $dir=$1;
( $xlate="${dir}x86_64-xlate.pl" and -f $xlate ) or
( $xlate="${dir}../../perlasm/x86_64-xlate.pl" and -f $xlate) or
die "can't locate x86_64-xlate.pl";
open STDOUT,"| $^X $xlate $flavour $output";
# int bn_mul_mont(
$rp="%rdi"; # BN_ULONG *rp,
$ap="%rsi"; # const BN_ULONG *ap,
$bp="%rdx"; # const BN_ULONG *bp,
$np="%rcx"; # const BN_ULONG *np,
$n0="%r8"; # const BN_ULONG *n0,
$num="%r9"; # int num);
$lo0="%r10";
$hi0="%r11";
$bp="%r12"; # reassign $bp
$hi1="%r13";
$i="%r14";
$j="%r15";
$m0="%rbx";
$m1="%rbp";
$code=<<___;
.text
.globl bn_mul_mont
.type bn_mul_mont,\@function,6
.align 16
bn_mul_mont:
push %rbx
push %rbp
push %r12
push %r13
push %r14
push %r15
mov ${num}d,${num}d
lea 2($num),%r10
mov %rsp,%r11
neg %r10
lea (%rsp,%r10,8),%rsp # tp=alloca(8*(num+2))
and \$-1024,%rsp # minimize TLB usage
mov %r11,8(%rsp,$num,8) # tp[num+1]=%rsp
.Lprologue:
mov %rdx,$bp # $bp reassigned, remember?
mov ($n0),$n0 # pull n0[0] value
xor $i,$i # i=0
xor $j,$j # j=0
mov ($bp),$m0 # m0=bp[0]
mov ($ap),%rax
mulq $m0 # ap[0]*bp[0]
mov %rax,$lo0
mov %rdx,$hi0
imulq $n0,%rax # "tp[0]"*n0
mov %rax,$m1
mulq ($np) # np[0]*m1
add $lo0,%rax # discarded
adc \$0,%rdx
mov %rdx,$hi1
lea 1($j),$j # j++
.L1st:
mov ($ap,$j,8),%rax
mulq $m0 # ap[j]*bp[0]
add $hi0,%rax
adc \$0,%rdx
mov %rax,$lo0
mov ($np,$j,8),%rax
mov %rdx,$hi0
mulq $m1 # np[j]*m1
add $hi1,%rax
lea 1($j),$j # j++
adc \$0,%rdx
add $lo0,%rax # np[j]*m1+ap[j]*bp[0]
adc \$0,%rdx
mov %rax,-16(%rsp,$j,8) # tp[j-1]
cmp $num,$j
mov %rdx,$hi1
jl .L1st
xor %rdx,%rdx
add $hi0,$hi1
adc \$0,%rdx
mov $hi1,-8(%rsp,$num,8)
mov %rdx,(%rsp,$num,8) # store upmost overflow bit
lea 1($i),$i # i++
.align 4
.Louter:
xor $j,$j # j=0
mov ($bp,$i,8),$m0 # m0=bp[i]
mov ($ap),%rax # ap[0]
mulq $m0 # ap[0]*bp[i]
add (%rsp),%rax # ap[0]*bp[i]+tp[0]
adc \$0,%rdx
mov %rax,$lo0
mov %rdx,$hi0
imulq $n0,%rax # tp[0]*n0
mov %rax,$m1
mulq ($np,$j,8) # np[0]*m1
add $lo0,%rax # discarded
mov 8(%rsp),$lo0 # tp[1]
adc \$0,%rdx
mov %rdx,$hi1
lea 1($j),$j # j++
.align 4
.Linner:
mov ($ap,$j,8),%rax
mulq $m0 # ap[j]*bp[i]
add $hi0,%rax
adc \$0,%rdx
add %rax,$lo0 # ap[j]*bp[i]+tp[j]
mov ($np,$j,8),%rax
adc \$0,%rdx
mov %rdx,$hi0
mulq $m1 # np[j]*m1
add $hi1,%rax
lea 1($j),$j # j++
adc \$0,%rdx
add $lo0,%rax # np[j]*m1+ap[j]*bp[i]+tp[j]
adc \$0,%rdx
mov (%rsp,$j,8),$lo0
cmp $num,$j
mov %rax,-16(%rsp,$j,8) # tp[j-1]
mov %rdx,$hi1
jl .Linner
xor %rdx,%rdx
add $hi0,$hi1
adc \$0,%rdx
add $lo0,$hi1 # pull upmost overflow bit
adc \$0,%rdx
mov $hi1,-8(%rsp,$num,8)
mov %rdx,(%rsp,$num,8) # store upmost overflow bit
lea 1($i),$i # i++
cmp $num,$i
jl .Louter
lea (%rsp),$ap # borrow ap for tp
lea -1($num),$j # j=num-1
mov ($ap),%rax # tp[0]
xor $i,$i # i=0 and clear CF!
jmp .Lsub
.align 16
.Lsub: sbb ($np,$i,8),%rax
mov %rax,($rp,$i,8) # rp[i]=tp[i]-np[i]
dec $j # doesn't affect CF!
mov 8($ap,$i,8),%rax # tp[i+1]
lea 1($i),$i # i++
jge .Lsub
sbb \$0,%rax # handle upmost overflow bit
and %rax,$ap
not %rax
mov $rp,$np
and %rax,$np
lea -1($num),$j
or $np,$ap # ap=borrow?tp:rp
.align 16
.Lcopy: # copy or in-place refresh
mov ($ap,$j,8),%rax
mov %rax,($rp,$j,8) # rp[i]=tp[i]
mov $i,(%rsp,$j,8) # zap temporary vector
dec $j
jge .Lcopy
mov 8(%rsp,$num,8),%rsi # restore %rsp
mov \$1,%rax
mov (%rsi),%r15
mov 8(%rsi),%r14
mov 16(%rsi),%r13
mov 24(%rsi),%r12
mov 32(%rsi),%rbp
mov 40(%rsi),%rbx
lea 48(%rsi),%rsp
.Lepilogue:
ret
.size bn_mul_mont,.-bn_mul_mont
.asciz "Montgomery Multiplication for x86_64, CRYPTOGAMS by <appro\@openssl.org>"
.align 16
___
# EXCEPTION_DISPOSITION handler (EXCEPTION_RECORD *rec,ULONG64 frame,
# CONTEXT *context,DISPATCHER_CONTEXT *disp)
if ($win64) {
$rec="%rcx";
$frame="%rdx";
$context="%r8";
$disp="%r9";
$code.=<<___;
.extern __imp_RtlVirtualUnwind
.type se_handler,\@abi-omnipotent
.align 16
se_handler:
push %rsi
push %rdi
push %rbx
push %rbp
push %r12
push %r13
push %r14
push %r15
pushfq
sub \$64,%rsp
mov 120($context),%rax # pull context->Rax
mov 248($context),%rbx # pull context->Rip
lea .Lprologue(%rip),%r10
cmp %r10,%rbx # context->Rip<.Lprologue
jb .Lin_prologue
mov 152($context),%rax # pull context->Rsp
lea .Lepilogue(%rip),%r10
cmp %r10,%rbx # context->Rip>=.Lepilogue
jae .Lin_prologue
mov 192($context),%r10 # pull $num
mov 8(%rax,%r10,8),%rax # pull saved stack pointer
lea 48(%rax),%rax
mov -8(%rax),%rbx
mov -16(%rax),%rbp
mov -24(%rax),%r12
mov -32(%rax),%r13
mov -40(%rax),%r14
mov -48(%rax),%r15
mov %rbx,144($context) # restore context->Rbx
mov %rbp,160($context) # restore context->Rbp
mov %r12,216($context) # restore context->R12
mov %r13,224($context) # restore context->R13
mov %r14,232($context) # restore context->R14
mov %r15,240($context) # restore context->R15
.Lin_prologue:
mov 8(%rax),%rdi
mov 16(%rax),%rsi
mov %rax,152($context) # restore context->Rsp
mov %rsi,168($context) # restore context->Rsi
mov %rdi,176($context) # restore context->Rdi
mov 40($disp),%rdi # disp->ContextRecord
mov $context,%rsi # context
mov \$154,%ecx # sizeof(CONTEXT)
.long 0xa548f3fc # cld; rep movsq
mov $disp,%rsi
xor %rcx,%rcx # arg1, UNW_FLAG_NHANDLER
mov 8(%rsi),%rdx # arg2, disp->ImageBase
mov 0(%rsi),%r8 # arg3, disp->ControlPc
mov 16(%rsi),%r9 # arg4, disp->FunctionEntry
mov 40(%rsi),%r10 # disp->ContextRecord
lea 56(%rsi),%r11 # &disp->HandlerData
lea 24(%rsi),%r12 # &disp->EstablisherFrame
mov %r10,32(%rsp) # arg5
mov %r11,40(%rsp) # arg6
mov %r12,48(%rsp) # arg7
mov %rcx,56(%rsp) # arg8, (NULL)
call *__imp_RtlVirtualUnwind(%rip)
mov \$1,%eax # ExceptionContinueSearch
add \$64,%rsp
popfq
pop %r15
pop %r14
pop %r13
pop %r12
pop %rbp
pop %rbx
pop %rdi
pop %rsi
ret
.size se_handler,.-se_handler
.section .pdata
.align 4
.rva .LSEH_begin_bn_mul_mont
.rva .LSEH_end_bn_mul_mont
.rva .LSEH_info_bn_mul_mont
.section .xdata
.align 8
.LSEH_info_bn_mul_mont:
.byte 9,0,0,0
.rva se_handler
___
}
print $code;
close STDOUT;