github.com/icodeface/tls@v0.0.0-20230910023335-34df9250cd12/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  	MOVL eaxArg+0(FP), AX
    12  	MOVL ecxArg+4(FP), CX
    13  	CPUID
    14  	MOVL AX, eax+8(FP)
    15  	MOVL BX, ebx+12(FP)
    16  	MOVL CX, ecx+16(FP)
    17  	MOVL DX, edx+20(FP)
    18  	RET
    19  
    20  // func xgetbv() (eax, edx uint32)
    21  TEXT ·xgetbv(SB),NOSPLIT,$0-8
    22  #ifdef GOOS_nacl
    23  	// nacl does not support XGETBV.
    24  	MOVL $0, eax+0(FP)
    25  	MOVL $0, edx+4(FP)
    26  #else
    27  	MOVL $0, CX
    28  	XGETBV
    29  	MOVL AX, eax+0(FP)
    30  	MOVL DX, edx+4(FP)
    31  #endif
    32  	RET