kernel/eka/common/win32/seh.cpp
author Adrian Taylor <adrian@macrobug.com>
Tue, 10 Nov 2009 20:10:34 +0000
changeset 1 cb3e90eb7d89
parent 0 a41df078684a
permissions -rw-r--r--
Improving comments on panics generated by CActive::SetActive. Patch slightly altered based on comments by John Imhofe.
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
0
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
     1
// Copyright (c) 2004-2009 Nokia Corporation and/or its subsidiary(-ies).
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
     2
// All rights reserved.
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
     3
// This component and the accompanying materials are made available
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
     4
// under the terms of the License "Eclipse Public License v1.0"
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
     5
// which accompanies this distribution, and is available
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
     6
// at the URL "http://www.eclipse.org/legal/epl-v10.html".
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
     7
//
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
     8
// Initial Contributors:
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
     9
// Nokia Corporation - initial contribution.
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
    10
//
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
    11
// Contributors:
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
    12
//
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
    13
// Description:
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
    14
// e32\common\win32\seh.cpp
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
    15
// 
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
    16
//
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
    17
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
    18
#include "seh.h"
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
    19
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
    20
// Fill in the blank types for TWin32SEHTrap
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
    21
#define __WIN32_SEH_TYPES_KNOWN__
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
    22
#define __UnknownWindowsType1 EXCEPTION_RECORD
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
    23
#define __UnknownWindowsType2 CONTEXT
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
    24
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
    25
// Pretend we're tools to avoid clashes with Win32 headers
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
    26
#define __TOOLS__
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
    27
#define __IN_SEH_CPP__
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
    28
#include <e32cmn.h>
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
    29
#include <e32cmn_private.h>
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
    30
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
    31
#include <emulator.h>
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
    32
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
    33
#include <e32panic.h>
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
    34
GLREF_C void Panic(TCdtPanic);
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
    35
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
    36
// magic value denoting the end of the SEH handler list
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
    37
static const TWin32SEHTrap* const KFencePost = (TWin32SEHTrap*)-1;
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
    38
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
    39
//
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
    40
// Class TWin32SEHTrap
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
    41
//
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
    42
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
    43
#ifdef __KERNEL_MODE__
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
    44
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
    45
extern DWORD CallFinalSEHHandler(EXCEPTION_RECORD* aException, CONTEXT* aContext)
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
    46
	{
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
    47
	// Get the final SEH entry on the chain
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
    48
	TWin32SEHTrap* finalHandler = TWin32SEHTrap::IterateForFinal();
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
    49
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
    50
	// Call the handler - ignoring return value
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
    51
	(void)(*finalHandler->ExceptionHandler())(aException, finalHandler, aContext);
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
    52
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
    53
	// Explicitly tell Win32 the exception has been handled
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
    54
	return ExceptionContinueExecution;
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
    55
	}
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
    56
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
    57
TWin32SEHTrap* TWin32SEHTrap::IterateForFinal()
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
    58
	{
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
    59
	TWin32SEHTrap* p = (TWin32SEHTrap*)Tib()->ExceptionList;
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
    60
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
    61
	// Iterate through the SEH chain to find the final SEH record that we wish to skip to
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
    62
    for (; p && p!=KFencePost && p->iPrevExceptionRegistrationRecord!=KFencePost; p=p->iPrevExceptionRegistrationRecord)
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
    63
		{}
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
    64
	return p;
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
    65
	}
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
    66
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
    67
TWin32SEHExceptionHandler* TWin32SEHTrap::ExceptionHandler()
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
    68
	{
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
    69
	return iExceptionHandler;
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
    70
	}
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
    71
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
    72
#else // !__KERNEL_MODE__
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
    73
#include <u32exec.h>
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
    74
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
    75
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
    76
extern "C" void trap_check(TWin32SEHTrap* a)
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
    77
	{
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
    78
	TWin32SEHTrap* p = a->iPrevExceptionRegistrationRecord;
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
    79
	if (p && p!=KFencePost && a->iExceptionHandler == p->iExceptionHandler && a->iExceptionHandler == &TWin32SEHTrap::ExceptionHandler)
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
    80
		Exec::PushTrapFrame((TTrap*)p);
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
    81
	else
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
    82
		Exec::PushTrapFrame(0);
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
    83
	}
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
    84
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
    85
extern "C" void untrap_check()
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
    86
	{
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
    87
	// search back for consecutive TWin32SEHTrap and remember the second one
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
    88
	TWin32SEHTrap* p = (TWin32SEHTrap*)Tib()->ExceptionList;
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
    89
	TWin32SEHTrap* q = 0;
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
    90
	TWin32SEHTrap* s = 0;
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
    91
	if (p && p!=KFencePost)
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
    92
		{
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
    93
		for(;;)
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
    94
			{
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
    95
			q = p->iPrevExceptionRegistrationRecord;
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
    96
			if (!q || q==KFencePost)
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
    97
				break;
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
    98
			if (p->iExceptionHandler == &TWin32SEHTrap::ExceptionHandler && q->iExceptionHandler == &TWin32SEHTrap::ExceptionHandler)
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
    99
				{
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
   100
				s = q;
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
   101
				break;
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
   102
				}
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
   103
			p = q;
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
   104
			}
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
   105
		}
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
   106
	Exec::PushTrapFrame((TTrap*)s);
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
   107
	}
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
   108
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
   109
// Use assembler to ensure no extra SEH frame is created by the compiler
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
   110
UEXPORT_C __NAKED__ void TWin32SEHTrap::Trap()
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
   111
	{
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
   112
	_asm mov eax, fs:[0]
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
   113
	_asm mov [ecx], eax
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
   114
	_asm mov fs:[0], ecx
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
   115
	_asm push ecx
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
   116
	_asm call trap_check
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
   117
	_asm pop ecx
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
   118
	_asm ret
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
   119
	}
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
   120
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
   121
extern "C" void panic_chain_corrupt()
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
   122
	{
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
   123
	Panic(EWin32SEHChainCorrupt);
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
   124
	}
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
   125
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
   126
// Use assembler to ensure no extra SEH frame is created by the compiler
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
   127
UEXPORT_C __NAKED__ void TWin32SEHTrap::UnTrap()
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
   128
	{
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
   129
	_asm mov eax, fs:[0]
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
   130
	_asm cmp eax, ecx
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
   131
	_asm ja untrap_0
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
   132
	_asm jb untrap_error
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
   133
	_asm mov eax, [ecx]
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
   134
	_asm mov fs:[0], eax
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
   135
	_asm xor eax, eax
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
   136
	_asm mov [ecx], eax
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
   137
	_asm call untrap_check
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
   138
untrap_0:
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
   139
	_asm ret
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
   140
untrap_error:
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
   141
	_asm jmp panic_chain_corrupt
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
   142
	}
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
   143
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
   144
UEXPORT_C TWin32SEHTrap::TWin32SEHTrap()
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
   145
	:	iPrevExceptionRegistrationRecord(NULL),
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
   146
		iExceptionHandler(&ExceptionHandler)
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
   147
	{
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
   148
	}
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
   149
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
   150
// Handler called whilst Win32 is walking the SEH chain
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
   151
DWORD TWin32SEHTrap::ExceptionHandler(EXCEPTION_RECORD* aException, TWin32SEHTrap* /*aRegistrationRecord*/, CONTEXT* aContext)
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
   152
	{
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
   153
	if (aException->ExceptionCode != EXCEPTION_MSCPP)
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
   154
		{
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
   155
		return Emulator::Win32SEHException(aException, aContext);
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
   156
		}
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
   157
	else
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
   158
		{
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
   159
		return ExceptionContinueSearch;
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
   160
		}
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
   161
	}
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
   162
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
   163
#if defined(__LEAVE_EQUALS_THROW__) && defined(__WINS__)
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
   164
extern "C" TWin32SEHTrap* pop_trap_frame()
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
   165
	{
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
   166
	return (TWin32SEHTrap*)Exec::PopTrapFrame();
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
   167
	}
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
   168
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
   169
extern "C" void leave_end()
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
   170
	{
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
   171
	Exec::LeaveEnd();
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
   172
	}
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
   173
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
   174
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
   175
EXPORT_C __NAKED__ TInt XLeaveException::GetReason() const
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
   176
	{
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
   177
	_asm push ecx
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
   178
	_asm call pop_trap_frame
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
   179
	_asm test eax, eax
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
   180
	_asm jz no_nested_trap
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
   181
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
   182
	// eax points to TWin32SEHTrap to be restored
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
   183
	// if current exception record is above eax on the stack just restore eax
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
   184
	_asm cmp eax, esp
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
   185
	_asm jbe nested_trap_error
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
   186
	_asm mov edx, fs:[0]
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
   187
	_asm cmp eax, edx
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
   188
	_asm ja nested_trap_insert_in_middle
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
   189
	_asm je no_nested_trap	// we haven't been unwound after all
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
   190
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
   191
	// check we eventually reach current exception record from eax
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
   192
	_asm mov ecx, eax
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
   193
	_asm mov edx, [eax+4]	// &TWin32SEHTrap::ExceptionHandler
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
   194
nested_trap_check:
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
   195
	_asm mov ecx, [ecx]
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
   196
	_asm cmp ecx, 0
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
   197
	_asm jz nested_trap_error
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
   198
	_asm cmp ecx, 0ffffffffh
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
   199
	_asm jz nested_trap_error
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
   200
	_asm cmp ecx, fs:[0]
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
   201
	_asm jz nested_trap_check_ok
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
   202
	_asm cmp edx, [ecx+4]	// all intervening entries should be TWin32SEHTrap
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
   203
	_asm jz nested_trap_check
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
   204
	_asm jmp nested_trap_error
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
   205
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
   206
	// other SEH handlers have been added after we were unwound so we need to insert eax 'in the middle'
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
   207
nested_trap_insert_in_middle:
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
   208
	_asm cmp eax, [edx]
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
   209
	_asm je no_nested_trap	// eax is still in the chain
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
   210
	_asm jb nested_trap_insert_in_middle_found
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
   211
	_asm mov edx, [edx]
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
   212
	_asm jmp nested_trap_insert_in_middle
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
   213
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
   214
nested_trap_insert_in_middle_found:
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
   215
	_asm mov ecx, [edx]		// first SEH above eax on stack
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
   216
	_asm cmp ecx, 0ffffffffh
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
   217
	_asm je nested_trap_error	// reached end of SEH list
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
   218
	_asm push edx
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
   219
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
   220
	// ECX should be reachable from EAX
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
   221
	_asm mov edx, eax
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
   222
nested_trap_insert_in_middle_check:
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
   223
	_asm mov edx, [edx]
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
   224
	_asm cmp ecx, edx
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
   225
	_asm je nested_trap_insert_in_middle_ok
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
   226
	_asm cmp edx, 0ffffffffh
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
   227
	_asm je nested_trap_error	// reached end of SEH list
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
   228
	_asm test edx, edx
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
   229
	_asm jnz nested_trap_insert_in_middle_check
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
   230
	_asm jmp nested_trap_error
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
   231
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
   232
nested_trap_insert_in_middle_ok:
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
   233
	_asm pop edx
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
   234
	_asm mov [edx], eax		// insert eax back into chain
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
   235
	_asm jmp no_nested_trap
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
   236
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
   237
nested_trap_check_ok:
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
   238
	_asm mov fs:[0], eax	// reinstall nested trap SEH handlers
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
   239
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
   240
no_nested_trap:
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
   241
	_asm call untrap_check	// check for other nested TRAPs
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
   242
	_asm call leave_end
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
   243
	_asm pop ecx
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
   244
	_asm mov eax, [ecx]XLeaveException.iR
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
   245
	_asm ret
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
   246
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
   247
nested_trap_error:
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
   248
	_asm jmp panic_chain_corrupt
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
   249
	}
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
   250
#endif	// defined(__LEAVE_EQUALS_THROW__) && defined(__WINS__)
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
   251
a41df078684a Convert Kernelhwsrv package from SFL to EPL
John Imhofe
parents:
diff changeset
   252
#endif //__KERNEL_MODE__