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// +build !gccgo 6 7#include "textflag.h" 8 9TEXT ·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 19loop: 20 SYNC 21 MOVW ·Baton(SB), R3 22 CMPBNE R3, $0, loop 23 24 // Restore stack 25 SUB $(1024 * 8), R15 26 RET 27