| // Copyright 2014 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 ppc64 ppc64le |
| // +build !gccgo |
| |
| #include "textflag.h" |
| |
| 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 |
| ADD $(1024 * 8), R1 |
| |
| // Ask signaller to setgid |
| MOVW $1, R3 |
| SYNC |
| MOVW R3, ·Baton(SB) |
| |
| // Wait for setgid completion |
| loop: |
| SYNC |
| MOVW ·Baton(SB), R3 |
| CMP R3, $0 |
| // Hint that we're in a spin loop |
| OR R1, R1, R1 |
| BNE loop |
| ISYNC |
| |
| // Restore stack |
| SUB $(1024 * 8), R1 |
| RET |
