| // 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. |
| |
| //go:build (amd64 || amd64p32) && 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 |
| ADDQ $(1024 * 8), SP |
| |
| // Ask signaller to setgid |
| MOVL $1, ·Baton(SB) |
| |
| // Wait for setgid completion |
| loop: |
| PAUSE |
| MOVL ·Baton(SB), AX |
| CMPL AX, $0 |
| JNE loop |
| |
| // Restore stack |
| SUBQ $(1024 * 8), SP |
| RET |
