mirror of
https://github.com/golang/go
synced 2024-11-24 19:40:09 -07:00
45c06b27a4
Replace the confusing game where a frame size of $-8 would suppress the implicit setting up of a stack frame with a nice explicit flag. The code to set up the function prologue is still a little confusing but better than it was. Change-Id: I1d49278ff42c6bc734ebfb079998b32bc53f8d9a Reviewed-on: https://go-review.googlesource.com/15670 Reviewed-by: Minux Ma <minux@golang.org>
33 lines
674 B
ArmAsm
33 lines
674 B
ArmAsm
// 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
|