| // 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 mips64 mips64le |
| // +build !gccgo |
| |
| #include "textflag.h" |
| |
| #define SYNC WORD $0xf |
| |
| TEXT ·RewindAndSetgid(SB),NOSPLIT|NOFRAME,$0-0 |
| // Rewind stack pointer so anything that happens on the stack |
| // will clobber the test pattern created by the caller |
| ADDV $(1024*8), R29 |
| |
| // Ask signaller to setgid |
| MOVW $1, R1 |
| SYNC |
| MOVW R1, ·Baton(SB) |
| SYNC |
| |
| // Wait for setgid completion |
| loop: |
| SYNC |
| MOVW ·Baton(SB), R1 |
| OR R2, R2, R2 // hint that we're in a spin loop |
| BNE R1, loop |
| SYNC |
| |
| // Restore stack |
| ADDV $(-1024*8), R29 |
| RET |
