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https://github.com/golang/go
synced 2024-09-30 14:18:32 -06:00
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.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// +build ppc64 ppc64le
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// +build !gccgo
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#include "textflag.h"
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TEXT ·RewindAndSetgid(SB),NOSPLIT|NOFRAME,$0-0
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// Rewind stack pointer so anything that happens on the stack
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// will clobber the test pattern created by the caller
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ADD $(1024 * 8), R1
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// Ask signaller to setgid
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MOVW $1, R3
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SYNC
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MOVW R3, ·Baton(SB)
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// Wait for setgid completion
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loop:
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SYNC
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MOVW ·Baton(SB), R3
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CMP R3, $0
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// Hint that we're in a spin loop
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OR R1, R1, R1
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BNE loop
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ISYNC
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// Restore stack
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SUB $(1024 * 8), R1
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RET
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