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 // +build riscv64
6 // +build gc
7
8 #include "textflag.h"
9
10 TEXT ·RewindAndSetgid(SB),NOSPLIT|NOFRAME,$0-0
11 // Rewind stack pointer so anything that happens on the stack
12 // will clobber the test pattern created by the caller
13 ADD $(1024*8), X2
14
15 // Ask signaller to setgid
16 MOV $1, X5
17 FENCE
18 MOVW X5, ·Baton(SB)
19 FENCE
20
21 // Wait for setgid completion
22 loop:
23 FENCE
24 MOVW ·Baton(SB), X5
25 OR X6, X6, X6 // hint that we're in a spin loop
26 BNE ZERO, X5, loop
27 FENCE
28
29 // Restore stack
30 ADD $(-1024*8), X2
31 RET
32
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