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1 // Copyright 2014 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 !gccgo
6
7 #include "textflag.h"
8
9 TEXT cas<>(SB),NOSPLIT,$0
10         MOVW    $0xffff0fc0, R15 // R15 is PC
11
12 TEXT ·RewindAndSetgid(SB),NOSPLIT,$-4-0
13         // Save link register
14         MOVW    R14, R4
15
16         // Rewind stack pointer so anything that happens on the stack
17         // will clobber the test pattern created by the caller
18         ADD     $(1024 * 8), R13
19
20         // Ask signaller to setgid
21         MOVW    $·Baton(SB), R2
22 storeloop:
23         MOVW    0(R2), R0
24         MOVW    $1, R1
25         BL      cas<>(SB)
26         BCC     storeloop
27
28         // Wait for setgid completion
29 loop:
30         MOVW    $0, R0
31         MOVW    $0, R1
32         BL      cas<>(SB)
33         BCC     loop
34
35         // Restore stack
36         SUB     $(1024 * 8), R13
37
38         MOVW    R4, R14
39         RET