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32 lines
670 B
ArmAsm
32 lines
670 B
ArmAsm
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// Copyright 2020 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// +build riscv64
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// +build !gccgo
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#include "textflag.h"
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TEXT ·RewindAndSetgid(SB),NOSPLIT|NOFRAME,$0-0
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// Rewind stack pointer so anything that happens on the stack
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// will clobber the test pattern created by the caller
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ADD $(1024*8), X2
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// Ask signaller to setgid
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MOV $1, X5
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FENCE
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MOVW X5, ·Baton(SB)
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FENCE
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// Wait for setgid completion
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loop:
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FENCE
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MOVW ·Baton(SB), X5
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OR X6, X6, X6 // hint that we're in a spin loop
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BNE ZERO, X5, loop
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FENCE
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// Restore stack
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ADD $(-1024*8), X2
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RET
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