github.com/huandu/go@v0.0.0-20151114150818-04e615e41150/misc/cgo/test/issue9400/asm_ppc64x.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 ppc64 ppc64le
     6  // +build !gccgo
     7  
     8  #include "textflag.h"
     9  
    10  TEXT ·RewindAndSetgid(SB),NOSPLIT,$-8-0
    11  	// Rewind stack pointer so anything that happens on the stack
    12  	// will clobber the test pattern created by the caller
    13  	ADD	$(1024 * 8), R1
    14  
    15  	// Ask signaller to setgid
    16  	MOVW	$1, R3
    17  	SYNC
    18  	MOVW	R3, ·Baton(SB)
    19  
    20  	// Wait for setgid completion
    21  loop:
    22  	SYNC
    23  	MOVW	·Baton(SB), R3
    24  	CMP	R3, $0
    25  	// Hint that we're in a spin loop
    26  	OR	R1, R1, R1
    27  	BNE	loop
    28  	ISYNC
    29  
    30  	// Restore stack
    31  	SUB	$(1024 * 8), R1
    32  	RET