| // Copyright 2016 The Go Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style |
| // license that can be found in the LICENSE file. |
| |
| // +build gc |
| |
| #include "textflag.h" |
| |
| TEXT ·RewindAndSetgid(SB),NOSPLIT,$0-0 |
| // Rewind stack pointer so anything that happens on the stack |
| // will clobber the test pattern created by the caller |
| ADD $(1024 * 8), R15 |
| |
| // Ask signaller to setgid |
| MOVD $·Baton(SB), R5 |
| MOVW $1, 0(R5) |
| |
| // Wait for setgid completion |
| loop: |
| SYNC |
| MOVW ·Baton(SB), R3 |
| CMPBNE R3, $0, loop |
| |
| // Restore stack |
| SUB $(1024 * 8), R15 |
| RET |
