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The test for #9400 relies on an assembler function that manipulates the stack pointer. Meanwile, it uses a global variable for synchronization. However, position independent code on 386 use a function call to fetch the base address for global variables. That function call in turn overwrites the Go stack. Fix that by fetching the global variable address once before the stack register manipulation. Fixes the android/386 builder. Change-Id: Ib77bd80affaa12f09d582d09d8b84a73bd021b60 Reviewed-on: https://go-review.googlesource.com/23683 Run-TryBot: Elias Naur <elias.naur@gmail.com> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: David Crawshaw <crawshaw@golang.org>
28 lines
578 B
ArmAsm
28 lines
578 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 !gccgo
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#include "textflag.h"
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TEXT ·RewindAndSetgid(SB),NOSPLIT,$0-0
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MOVL $·Baton(SB), BX
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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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ADDL $(1024 * 8), SP
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// Ask signaller to setgid
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MOVL $1, (BX)
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// Wait for setgid completion
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loop:
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PAUSE
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MOVL (BX), AX
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CMPL AX, $0
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JNE loop
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// Restore stack
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SUBL $(1024 * 8), SP
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RET
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