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- // 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 gc
- #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
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