github.com/bir3/gocompiler@v0.9.2202/src/cmd/cgo/internal/test/issue9400/asm_riscv64.s (about)

     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  
     9  TEXT ·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
    21  loop:
    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