github.com/epfl-dcsl/gotee@v0.0.0-20200909122901-014b35f5e5e9/src/internal/cpu/cpu_x86.s (about)

     1  // Copyright 2017 The Go Authors. All rights reserved.
     2  // Use of this source code is governed by a BSD-style
     3  // license that can be found in the LICENSE file.
     4  
     5  // +build 386 amd64 amd64p32
     6  
     7  #include "textflag.h"
     8  
     9  // func cpuid(eaxArg, ecxArg uint32) (eax, ebx, ecx, edx uint32)
    10  TEXT ·cpuid(SB), NOSPLIT, $0-24
    11  	// try to check if it is enclave.
    12  	MOVB runtime·isEnclave(SB), R8
    13  	CMPB R8, $1
    14  	JNE normal
    15  	RET
    16  
    17  normal:
    18  	MOVL eaxArg+0(FP), AX
    19  	MOVL ecxArg+4(FP), CX
    20  	CPUID
    21  	MOVL AX, eax+8(FP)
    22  	MOVL BX, ebx+12(FP)
    23  	MOVL CX, ecx+16(FP)
    24  	MOVL DX, edx+20(FP)
    25  	RET
    26  
    27  // func xgetbv() (eax, edx uint32)
    28  TEXT ·xgetbv(SB),NOSPLIT,$0-8
    29  #ifdef GOOS_nacl
    30  	// nacl does not support XGETBV.
    31  	MOVL $0, eax+0(FP)
    32  	MOVL $0, edx+4(FP)
    33  #else
    34  	MOVL $0, CX
    35  	XGETBV
    36  	MOVL AX, eax+0(FP)
    37  	MOVL DX, edx+4(FP)
    38  #endif
    39  	RET