github.com/riscv/riscv-go@v0.0.0-20200123204226-124ebd6fcc8e/misc/cgo/test/issue9400/asm_amd64x.s (about)

     1  // Copyright 2014 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 amd64 amd64p32
     6  // +build !gccgo
     7  
     8  #include "textflag.h"
     9  
    10  TEXT ·RewindAndSetgid(SB),NOSPLIT,$0-0
    11  	// Rewind stack pointer so anything that happens on the stack
    12  	// will clobber the test pattern created by the caller
    13  	ADDQ	$(1024 * 8), SP
    14  
    15  	// Ask signaller to setgid
    16  	MOVL	$1, ·Baton(SB)
    17  
    18  	// Wait for setgid completion
    19  loop:
    20  	PAUSE
    21  	MOVL	·Baton(SB), AX
    22  	CMPL	AX, $0
    23  	JNE	loop
    24  
    25  	// Restore stack
    26  	SUBQ	$(1024 * 8), SP
    27  	RET