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bc15070085
The Windows unhandled exception mechanism fails to call the callback set in SetUnhandledExceptionFilter if the stack can't be correctly unwound. Some cgo glue code was not properly chaining the frame pointer, making the stack unwind to fail in case of an exception inside a cgo call. This CL fix that and adds a test case to avoid regressions. Fixes #50951 Change-Id: Ic782b5257fe90b05e3def8dbf0bb8d4ed37a190b Reviewed-on: https://go-review.googlesource.com/c/go/+/525475 Reviewed-by: Bryan Mills <bcmills@google.com> Reviewed-by: Cherry Mui <cherryyz@google.com> Run-TryBot: Quim Muntal <quimmuntal@gmail.com> LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com> TryBot-Result: Gopher Robot <gobot@golang.org>
89 lines
2.3 KiB
Go
89 lines
2.3 KiB
Go
// Copyright 2009 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 runtime
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const _CONTEXT_CONTROL = 0x10001
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type floatingsavearea struct {
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controlword uint32
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statusword uint32
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tagword uint32
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erroroffset uint32
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errorselector uint32
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dataoffset uint32
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dataselector uint32
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registerarea [80]uint8
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cr0npxstate uint32
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}
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type context struct {
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contextflags uint32
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dr0 uint32
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dr1 uint32
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dr2 uint32
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dr3 uint32
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dr6 uint32
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dr7 uint32
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floatsave floatingsavearea
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seggs uint32
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segfs uint32
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seges uint32
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segds uint32
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edi uint32
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esi uint32
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ebx uint32
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edx uint32
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ecx uint32
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eax uint32
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ebp uint32
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eip uint32
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segcs uint32
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eflags uint32
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esp uint32
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segss uint32
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extendedregisters [512]uint8
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}
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func (c *context) ip() uintptr { return uintptr(c.eip) }
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func (c *context) sp() uintptr { return uintptr(c.esp) }
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// 386 does not have link register, so this returns 0.
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func (c *context) lr() uintptr { return 0 }
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func (c *context) set_lr(x uintptr) {}
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func (c *context) set_ip(x uintptr) { c.eip = uint32(x) }
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func (c *context) set_sp(x uintptr) { c.esp = uint32(x) }
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// 386 does not have frame pointer register.
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func (c *context) set_fp(x uintptr) {}
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func prepareContextForSigResume(c *context) {
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c.edx = c.esp
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c.ecx = c.eip
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}
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func dumpregs(r *context) {
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print("eax ", hex(r.eax), "\n")
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print("ebx ", hex(r.ebx), "\n")
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print("ecx ", hex(r.ecx), "\n")
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print("edx ", hex(r.edx), "\n")
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print("edi ", hex(r.edi), "\n")
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print("esi ", hex(r.esi), "\n")
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print("ebp ", hex(r.ebp), "\n")
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print("esp ", hex(r.esp), "\n")
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print("eip ", hex(r.eip), "\n")
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print("eflags ", hex(r.eflags), "\n")
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print("cs ", hex(r.segcs), "\n")
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print("fs ", hex(r.segfs), "\n")
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print("gs ", hex(r.seggs), "\n")
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}
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// _DISPATCHER_CONTEXT is not defined on 386.
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type _DISPATCHER_CONTEXT struct{}
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func (c *_DISPATCHER_CONTEXT) ctx() *context {
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return nil
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}
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