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// Copyright 2020 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.
// +build riscv64
// +build gc
#include "textflag.h"
TEXT ·RewindAndSetgid(SB),NOSPLIT|NOFRAME,$0-0
// Rewind stack pointer so anything that happens on the stack
// will clobber the test pattern created by the caller
ADD $(1024*8), X2
// Ask signaller to setgid
MOV $1, X5
FENCE
MOVW X5, ·Baton(SB)
FENCE
// Wait for setgid completion
loop:
FENCE
MOVW ·Baton(SB), X5
OR X6, X6, X6 // hint that we're in a spin loop
BNE ZERO, X5, loop
FENCE
// Restore stack
ADD $(-1024*8), X2
RET
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