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runtime: increase stack frame during cgo call on windows/amd64
Fixes #3945. R=golang-dev, minux.ma CC=golang-dev, vcc.163 https://golang.org/cl/6490056
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@ -29,5 +29,6 @@ func TestSetEnv(t *testing.T) { testSetEnv(t) }
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func TestHelpers(t *testing.T) { testHelpers(t) }
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func TestLibgcc(t *testing.T) { testLibgcc(t) }
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func Test1635(t *testing.T) { test1635(t) }
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func TestPrintf(t *testing.T) { testPrintf(t) }
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func BenchmarkCgoCall(b *testing.B) { benchCgoCall(b) }
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22
misc/cgo/test/issue3945.go
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22
misc/cgo/test/issue3945.go
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@ -0,0 +1,22 @@
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// Copyright 2012 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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package cgotest
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// Test that cgo reserves enough stack space during cgo call.
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// See http://golang.org/issue/3945 for details.
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// #include <stdio.h>
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//
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// void say() {
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// printf("%s from C\n", "hello");
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// }
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//
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import "C"
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import "testing"
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func testPrintf(t *testing.T) {
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C.say()
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}
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@ -489,19 +489,21 @@ TEXT runtime·asmcgocall(SB),7,$0
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MOVQ (g_sched+gobuf_sp)(SI), SP
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// Now on a scheduling stack (a pthread-created stack).
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SUBQ $48, SP
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// Make sure we have enough room for 4 stack-backed fast-call
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// registers as per windows amd64 calling convention.
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SUBQ $64, SP
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ANDQ $~15, SP // alignment for gcc ABI
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MOVQ DI, 32(SP) // save g
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MOVQ DX, 24(SP) // save SP
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MOVQ DI, 48(SP) // save g
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MOVQ DX, 40(SP) // save SP
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MOVQ BX, DI // DI = first argument in AMD64 ABI
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MOVQ BX, CX // CX = first argument in Win64
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CALL AX
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// Restore registers, g, stack pointer.
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get_tls(CX)
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MOVQ 32(SP), DI
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MOVQ 48(SP), DI
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MOVQ DI, g(CX)
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MOVQ 24(SP), SP
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MOVQ 40(SP), SP
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RET
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// cgocallback(void (*fn)(void*), void *frame, uintptr framesize)
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