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// Copyright 2014 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
//go:build gc
#include "textflag.h"
TEXT cas<>(SB),NOSPLIT,$0
MOVW $0xffff0fc0, R15 // R15 is PC
TEXT ·RewindAndSetgid(SB),NOSPLIT|NOFRAME,$0-0
// Save link register
MOVW R14, R4
// Rewind stack pointer so anything that happens on the stack
// will clobber the test pattern created by the caller
ADD $(1024 * 8), R13
// Ask signaller to setgid
MOVW $·Baton(SB), R2
storeloop:
MOVW 0(R2), R0
MOVW $1, R1
BL cas<>(SB)
BCC storeloop
// Wait for setgid completion
loop:
MOVW $0, R0
MOVW $0, R1
BL cas<>(SB)
BCC loop
// Restore stack
SUB $(1024 * 8), R13
MOVW R4, R14
RET
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