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openssl/crypto/x86_64cpuid.pl
Andy Polyakov 7933762870 crypto/x86_64cpuid.pl: suppress AVX512F flag on Skylake-X. 
It was observed that AVX512 code paths can negatively affect overall
Skylake-X system performance. But we are talking specifically about
512-bit code, while AVX512VL, 256-bit variant of AVX512F instructions,
is supposed to fly as smooth as AVX2. Which is why it remains unmasked.

Reviewed-by: Rich Salz <rsalz@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/4838)
2017-12-08 12:57:09 +01:00

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#! /usr/bin/env perl
# Copyright 2005-2016 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
$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 $xlate) or
die "can't locate x86_64-xlate.pl";
open OUT,"| \"$^X\" \"$xlate\" $flavour \"$output\"";
*STDOUT=*OUT;
($arg1,$arg2,$arg3,$arg4)=$win64?("%rcx","%rdx","%r8", "%r9") : # Win64 order
("%rdi","%rsi","%rdx","%rcx"); # Unix order
print<<___;
.extern OPENSSL_cpuid_setup
.hidden OPENSSL_cpuid_setup
.section .init
call OPENSSL_cpuid_setup
.hidden OPENSSL_ia32cap_P
.comm OPENSSL_ia32cap_P,16,4
.text
.globl OPENSSL_atomic_add
.type OPENSSL_atomic_add,\@abi-omnipotent
.align 16
OPENSSL_atomic_add:
movl ($arg1),%eax
.Lspin: leaq ($arg2,%rax),%r8
.byte 0xf0 # lock
cmpxchgl %r8d,($arg1)
jne .Lspin
movl %r8d,%eax
.byte 0x48,0x98 # cltq/cdqe
ret
.size OPENSSL_atomic_add,.-OPENSSL_atomic_add
.globl OPENSSL_rdtsc
.type OPENSSL_rdtsc,\@abi-omnipotent
.align 16
OPENSSL_rdtsc:
rdtsc
shl \$32,%rdx
or %rdx,%rax
ret
.size OPENSSL_rdtsc,.-OPENSSL_rdtsc
.globl OPENSSL_ia32_cpuid
.type OPENSSL_ia32_cpuid,\@function,1
.align 16
OPENSSL_ia32_cpuid:
.cfi_startproc
mov %rbx,%r8 # save %rbx
.cfi_register %rbx,%r8
xor %eax,%eax
mov %rax,8(%rdi) # clear extended feature flags
cpuid
mov %eax,%r11d # max value for standard query level
xor %eax,%eax
cmp \$0x756e6547,%ebx # "Genu"
setne %al
mov %eax,%r9d
cmp \$0x49656e69,%edx # "ineI"
setne %al
or %eax,%r9d
cmp \$0x6c65746e,%ecx # "ntel"
setne %al
or %eax,%r9d # 0 indicates Intel CPU
jz .Lintel
cmp \$0x68747541,%ebx # "Auth"
setne %al
mov %eax,%r10d
cmp \$0x69746E65,%edx # "enti"
setne %al
or %eax,%r10d
cmp \$0x444D4163,%ecx # "cAMD"
setne %al
or %eax,%r10d # 0 indicates AMD CPU
jnz .Lintel
# AMD specific
mov \$0x80000000,%eax
cpuid
cmp \$0x80000001,%eax
jb .Lintel
mov %eax,%r10d
mov \$0x80000001,%eax
cpuid
or %ecx,%r9d
and \$0x00000801,%r9d # isolate AMD XOP bit, 1<<11
cmp \$0x80000008,%r10d
jb .Lintel
mov \$0x80000008,%eax
cpuid
movzb %cl,%r10 # number of cores - 1
inc %r10 # number of cores
mov \$1,%eax
cpuid
bt \$28,%edx # test hyper-threading bit
jnc .Lgeneric
shr \$16,%ebx # number of logical processors
cmp %r10b,%bl
ja .Lgeneric
and \$0xefffffff,%edx # ~(1<<28)
jmp .Lgeneric
.Lintel:
cmp \$4,%r11d
mov \$-1,%r10d
jb .Lnocacheinfo
mov \$4,%eax
mov \$0,%ecx # query L1D
cpuid
mov %eax,%r10d
shr \$14,%r10d
and \$0xfff,%r10d # number of cores -1 per L1D
.Lnocacheinfo:
mov \$1,%eax
cpuid
movd %eax,%xmm0 # put aside processor id
and \$0xbfefffff,%edx # force reserved bits to 0
cmp \$0,%r9d
jne .Lnotintel
or \$0x40000000,%edx # set reserved bit#30 on Intel CPUs
and \$15,%ah
cmp \$15,%ah # examine Family ID
jne .LnotP4
or \$0x00100000,%edx # set reserved bit#20 to engage RC4_CHAR
.LnotP4:
cmp \$6,%ah
jne .Lnotintel
and \$0x0fff0ff0,%eax
cmp \$0x00050670,%eax # Knights Landing
je .Lknights
cmp \$0x00080650,%eax # Knights Mill (according to sde)
jne .Lnotintel
.Lknights:
and \$0xfbffffff,%ecx # clear XSAVE flag to mimic Silvermont
.Lnotintel:
bt \$28,%edx # test hyper-threading bit
jnc .Lgeneric
and \$0xefffffff,%edx # ~(1<<28)
cmp \$0,%r10d
je .Lgeneric
or \$0x10000000,%edx # 1<<28
shr \$16,%ebx
cmp \$1,%bl # see if cache is shared
ja .Lgeneric
and \$0xefffffff,%edx # ~(1<<28)
.Lgeneric:
and \$0x00000800,%r9d # isolate AMD XOP flag
and \$0xfffff7ff,%ecx
or %ecx,%r9d # merge AMD XOP flag
mov %edx,%r10d # %r9d:%r10d is copy of %ecx:%edx
cmp \$7,%r11d
jb .Lno_extended_info
mov \$7,%eax
xor %ecx,%ecx
cpuid
bt \$26,%r9d # check XSAVE bit, cleared on Knights
jc .Lnotknights
and \$0xfff7ffff,%ebx # clear ADCX/ADOX flag
.Lnotknights:
movd %xmm0,%eax # restore processor id
and \$0x0fff0ff0,%eax
cmp \$0x00050650,%eax # Skylake-X
jne .Lnotskylakex
and \$0xfffeffff,%ebx # ~(1<<16)
# suppress AVX512F flag on Skylake-X
.Lnotskylakex:
mov %ebx,8(%rdi) # save extended feature flags
mov %ecx,12(%rdi)
.Lno_extended_info:
bt \$27,%r9d # check OSXSAVE bit
jnc .Lclear_avx
xor %ecx,%ecx # XCR0
.byte 0x0f,0x01,0xd0 # xgetbv
and \$0xe6,%eax # isolate XMM, YMM and ZMM state support
cmp \$0xe6,%eax
je .Ldone
andl \$0x3fdeffff,8(%rdi) # ~(1<<31|1<<30|1<<21|1<<16)
# clear AVX512F+BW+VL+FIMA, all of
# them are EVEX-encoded, which requires
# ZMM state support even if one uses
# only XMM and YMM :-(
and \$6,%eax # isolate XMM and YMM state support
cmp \$6,%eax
je .Ldone
.Lclear_avx:
mov \$0xefffe7ff,%eax # ~(1<<28|1<<12|1<<11)
and %eax,%r9d # clear AVX, FMA and AMD XOP bits
mov \$0x3fdeffdf,%eax # ~(1<<31|1<<30|1<<21|1<<16|1<<5)
and %eax,8(%rdi) # clear AVX2 and AVX512* bits
.Ldone:
shl \$32,%r9
mov %r10d,%eax
mov %r8,%rbx # restore %rbx
.cfi_restore %rbx
or %r9,%rax
ret
.cfi_endproc
.size OPENSSL_ia32_cpuid,.-OPENSSL_ia32_cpuid
.globl OPENSSL_cleanse
.type OPENSSL_cleanse,\@abi-omnipotent
.align 16
OPENSSL_cleanse:
xor %rax,%rax
cmp \$15,$arg2
jae .Lot
cmp \$0,$arg2
je .Lret
.Little:
mov %al,($arg1)
sub \$1,$arg2
lea 1($arg1),$arg1
jnz .Little
.Lret:
ret
.align 16
.Lot:
test \$7,$arg1
jz .Laligned
mov %al,($arg1)
lea -1($arg2),$arg2
lea 1($arg1),$arg1
jmp .Lot
.Laligned:
mov %rax,($arg1)
lea -8($arg2),$arg2
test \$-8,$arg2
lea 8($arg1),$arg1
jnz .Laligned
cmp \$0,$arg2
jne .Little
ret
.size OPENSSL_cleanse,.-OPENSSL_cleanse
.globl CRYPTO_memcmp
.type CRYPTO_memcmp,\@abi-omnipotent
.align 16
CRYPTO_memcmp:
xor %rax,%rax
xor %r10,%r10
cmp \$0,$arg3
je .Lno_data
.Loop_cmp:
mov ($arg1),%r10b
lea 1($arg1),$arg1
xor ($arg2),%r10b
lea 1($arg2),$arg2
or %r10b,%al
dec $arg3
jnz .Loop_cmp
neg %rax
shr \$63,%rax
.Lno_data:
ret
.size CRYPTO_memcmp,.-CRYPTO_memcmp
___
print<<___ if (!$win64);
.globl OPENSSL_wipe_cpu
.type OPENSSL_wipe_cpu,\@abi-omnipotent
.align 16
OPENSSL_wipe_cpu:
pxor %xmm0,%xmm0
pxor %xmm1,%xmm1
pxor %xmm2,%xmm2
pxor %xmm3,%xmm3
pxor %xmm4,%xmm4
pxor %xmm5,%xmm5
pxor %xmm6,%xmm6
pxor %xmm7,%xmm7
pxor %xmm8,%xmm8
pxor %xmm9,%xmm9
pxor %xmm10,%xmm10
pxor %xmm11,%xmm11
pxor %xmm12,%xmm12
pxor %xmm13,%xmm13
pxor %xmm14,%xmm14
pxor %xmm15,%xmm15
xorq %rcx,%rcx
xorq %rdx,%rdx
xorq %rsi,%rsi
xorq %rdi,%rdi
xorq %r8,%r8
xorq %r9,%r9
xorq %r10,%r10
xorq %r11,%r11
leaq 8(%rsp),%rax
ret
.size OPENSSL_wipe_cpu,.-OPENSSL_wipe_cpu
___
print<<___ if ($win64);
.globl OPENSSL_wipe_cpu
.type OPENSSL_wipe_cpu,\@abi-omnipotent
.align 16
OPENSSL_wipe_cpu:
pxor %xmm0,%xmm0
pxor %xmm1,%xmm1
pxor %xmm2,%xmm2
pxor %xmm3,%xmm3
pxor %xmm4,%xmm4
pxor %xmm5,%xmm5
xorq %rcx,%rcx
xorq %rdx,%rdx
xorq %r8,%r8
xorq %r9,%r9
xorq %r10,%r10
xorq %r11,%r11
leaq 8(%rsp),%rax
ret
.size OPENSSL_wipe_cpu,.-OPENSSL_wipe_cpu
___
{
my $out="%r10";
my $cnt="%rcx";
my $max="%r11";
my $lasttick="%r8d";
my $lastdiff="%r9d";
my $redzone=win64?8:-8;
print<<___;
.globl OPENSSL_instrument_bus
.type OPENSSL_instrument_bus,\@abi-omnipotent
.align 16
OPENSSL_instrument_bus:
mov $arg1,$out # tribute to Win64
mov $arg2,$cnt
mov $arg2,$max
rdtsc # collect 1st tick
mov %eax,$lasttick # lasttick = tick
mov \$0,$lastdiff # lastdiff = 0
clflush ($out)
.byte 0xf0 # lock
add $lastdiff,($out)
jmp .Loop
.align 16
.Loop: rdtsc
mov %eax,%edx
sub $lasttick,%eax
mov %edx,$lasttick
mov %eax,$lastdiff
clflush ($out)
.byte 0xf0 # lock
add %eax,($out)
lea 4($out),$out
sub \$1,$cnt
jnz .Loop
mov $max,%rax
ret
.size OPENSSL_instrument_bus,.-OPENSSL_instrument_bus
.globl OPENSSL_instrument_bus2
.type OPENSSL_instrument_bus2,\@abi-omnipotent
.align 16
OPENSSL_instrument_bus2:
mov $arg1,$out # tribute to Win64
mov $arg2,$cnt
mov $arg3,$max
mov $cnt,$redzone(%rsp)
rdtsc # collect 1st tick
mov %eax,$lasttick # lasttick = tick
mov \$0,$lastdiff # lastdiff = 0
clflush ($out)
.byte 0xf0 # lock
add $lastdiff,($out)
rdtsc # collect 1st diff
mov %eax,%edx
sub $lasttick,%eax # diff
mov %edx,$lasttick # lasttick = tick
mov %eax,$lastdiff # lastdiff = diff
.Loop2:
clflush ($out)
.byte 0xf0 # lock
add %eax,($out) # accumulate diff
sub \$1,$max
jz .Ldone2
rdtsc
mov %eax,%edx
sub $lasttick,%eax # diff
mov %edx,$lasttick # lasttick = tick
cmp $lastdiff,%eax
mov %eax,$lastdiff # lastdiff = diff
mov \$0,%edx
setne %dl
sub %rdx,$cnt # conditional --$cnt
lea ($out,%rdx,4),$out # conditional ++$out
jnz .Loop2
.Ldone2:
mov $redzone(%rsp),%rax
sub $cnt,%rax
ret
.size OPENSSL_instrument_bus2,.-OPENSSL_instrument_bus2
___
}
sub gen_random {
my $rdop = shift;
print<<___;
.globl OPENSSL_ia32_${rdop}
.type OPENSSL_ia32_${rdop},\@abi-omnipotent
.align 16
OPENSSL_ia32_${rdop}:
mov \$8,%ecx
.Loop_${rdop}:
${rdop} %rax
jc .Lbreak_${rdop}
loop .Loop_${rdop}
.Lbreak_${rdop}:
cmp \$0,%rax
cmove %rcx,%rax
ret
.size OPENSSL_ia32_${rdop},.-OPENSSL_ia32_${rdop}
.globl OPENSSL_ia32_${rdop}_bytes
.type OPENSSL_ia32_${rdop}_bytes,\@abi-omnipotent
.align 16
OPENSSL_ia32_${rdop}_bytes:
xor %rax, %rax # return value
cmp \$0,$arg2
je .Ldone_${rdop}_bytes
mov \$8,%r11
.Loop_${rdop}_bytes:
${rdop} %r10
jc .Lbreak_${rdop}_bytes
dec %r11
jnz .Loop_${rdop}_bytes
jmp .Ldone_${rdop}_bytes
.align 16
.Lbreak_${rdop}_bytes:
cmp \$8,$arg2
jb .Ltail_${rdop}_bytes
mov %r10,($arg1)
lea 8($arg1),$arg1
add \$8,%rax
sub \$8,$arg2
jz .Ldone_${rdop}_bytes
mov \$8,%r11
jmp .Loop_${rdop}_bytes
.align 16
.Ltail_${rdop}_bytes:
mov %r10b,($arg1)
lea 1($arg1),$arg1
inc %rax
shr \$8,%r8
dec $arg2
jnz .Ltail_${rdop}_bytes
.Ldone_${rdop}_bytes:
ret
.size OPENSSL_ia32_${rdop}_bytes,.-OPENSSL_ia32_${rdop}_bytes
___
}
gen_random("rdrand");
gen_random("rdseed");
close STDOUT; # flush
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