Text file src/cmd/cgo/internal/test/issue9400/asm_riscv64.s

Documentation: cmd/cgo/internal/test/issue9400

     1// Copyright 2020 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 riscv64 && gc
     6
     7#include "textflag.h"
     8
     9TEXT ·RewindAndSetgid(SB),NOSPLIT|NOFRAME,$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), X2
    13
    14	// Ask signaller to setgid
    15	MOV	$1, X5
    16	FENCE
    17	MOVW	X5, ·Baton(SB)
    18	FENCE
    19
    20	// Wait for setgid completion
    21loop:
    22	FENCE
    23	MOVW	·Baton(SB), X5
    24	OR	X6, X6, X6	// hint that we're in a spin loop
    25	BNE	ZERO, X5, loop
    26	FENCE
    27
    28	// Restore stack
    29	ADD	$(-1024*8), X2
    30	RET

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