| // 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 amd64 amd64p32 | |
| // +build !gccgo | |
| #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 |