openssl/crypto/x86_64cpuid.pl

#!/usr/bin/env perl

$output=shift;
$masm=1 if ($output =~ /\.asm/);
open STDOUT,">$output" || die "can't open $output: $!";

print<<___ if(defined($masm));
_TEXT	SEGMENT
PUBLIC	OPENSSL_rdtsc

PUBLIC	OPENSSL_atomic_add
ALIGN	16
OPENSSL_atomic_add	PROC
	mov	eax,DWORD PTR[rcx]
\$Lspin:	lea	r8,DWORD PTR[rdx+rax]
lock	cmpxchg	DWORD PTR[rcx],r8d
	jne	\$Lspin
	mov	eax,r8d
	cdqe    
	ret
OPENSSL_atomic_add	ENDP

PUBLIC	OPENSSL_wipe_cpu
ALIGN	16
OPENSSL_wipe_cpu	PROC
	pxor	xmm0,xmm0
	pxor	xmm1,xmm1
	pxor	xmm2,xmm2
	pxor	xmm3,xmm3
	pxor	xmm4,xmm4
	pxor	xmm5,xmm5
	xor	rcx,rcx
	xor	rdx,rdx
	xor	r8,r8
	xor	r9,r9
	xor	r10,r10
	xor	r11,r11
	lea	rax,QWORD PTR[rsp+8]
	ret
OPENSSL_wipe_cpu	ENDP
_TEXT	ENDS

CRT\$XIU	SEGMENT
EXTRN	OPENSSL_cpuid_setup:PROC
DQ	OPENSSL_cpuid_setup
CRT\$XIU	ENDS

___
print<<___ if(!defined($masm));
.text

.globl	OPENSSL_atomic_add
.type	OPENSSL_atomic_add,\@function
.align	16
OPENSSL_atomic_add:
	movl	(%rdi),%eax
.Lspin:	leaq	(%rsi,%rax),%r8
lock;	cmpxchgl	%r8d,(%rdi)
	jne	.Lspin
	movl	%r8d,%eax
	.byte	0x48,0x98
	ret
.size	OPENSSL_atomic_add,.-OPENSSL_atomic_add

.globl	OPENSSL_wipe_cpu
.type	OPENSSL_wipe_cpu,\@function
.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

.section	.init
	call	OPENSSL_cpuid_setup

___

open STDOUT,"| $^X perlasm/x86_64-xlate.pl $output";
print<<___;
.text

.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,\@abi-omnipotent
.align	16
OPENSSL_ia32_cpuid:
	mov	%rbx,%r8

	xor	%eax,%eax
	cpuid
	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

	mov	\$1,%eax
	cpuid
	cmp	\$0,%r9d
	jne	.Lnotintel
	or	\$0x00100000,%edx	# use reserved 20th bit to engage RC4_CHAR
	and	\$15,%ah
	cmp	\$15,%ah		# examine Family ID
	je	.Lnotintel
	or	\$0x40000000,%edx	# use reserved 30th bit to skip unrolled loop
.Lnotintel:
	bt	\$28,%edx		# test hyper-threading bit
	jnc	.Ldone
	shr	\$16,%ebx
	cmp	\$1,%bl			# see if cache is shared
	ja	.Ldone
	and	\$0xefffffff,%edx	# ~(1<<28)
.Ldone:
	shl	\$32,%rcx
	mov	%edx,%eax
	mov	%r8,%rbx
	or	%rcx,%rax
	ret
.size	OPENSSL_ia32_cpuid,.-OPENSSL_ia32_cpuid
___
close STDOUT;	# flush