github.com/bir3/gocompiler@v0.9.2202/src/cmd/cgo/internal/test/issue9400/asm_s390x.s (about)

     1  // Copyright 2016 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  //go:build gc
     6  
     7  #include "textflag.h"
     8  
     9  TEXT ·RewindAndSetgid(SB),NOSPLIT,$0-0
    10  	// Rewind stack pointer so anything that happens on the stack
    11  	// will clobber the test pattern created by the caller
    12  	ADD	$(1024 * 8), R15
    13  
    14  	// Ask signaller to setgid
    15  	MOVD	$·Baton(SB), R5
    16  	MOVW	$1, 0(R5)
    17  
    18  	// Wait for setgid completion
    19  loop:
    20  	SYNC
    21  	MOVW	·Baton(SB), R3
    22  	CMPBNE	R3, $0, loop
    23  
    24  	// Restore stack
    25  	SUB	$(1024 * 8), R15
    26  	RET