mirror of
https://github.com/reactos/reactos.git
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300 lines
6.6 KiB
C
300 lines
6.6 KiB
C
/*
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* ReactOS kernel
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* Copyright (C) 2000 David Welch <welch@cwcom.net>
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*
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* Moved to MSVC-compatible inline assembler by Mike Nordell, 2003-12-26
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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/*
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* FILE: ntoskrnl/ke/i386/vm86_sup.S
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* PURPOSE: V86 mode support
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* PROGRAMMER: David Welch (welch@cwcom.net)
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* UPDATE HISTORY:
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* Created 09/10/00
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*/
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/* INCLUDES ******************************************************************/
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#pragma hdrstop
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#include <ddk/ntddk.h>
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#include <ddk/status.h>
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#include <internal/i386/segment.h>
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#include <internal/i386/fpu.h>
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#include <internal/ps.h>
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#include <ddk/defines.h>
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#include <internal/v86m.h>
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#include <ntos/tss.h>
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//#include <ntos/service.h>
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#include <internal/trap.h>
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#include <internal/ps.h>
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#include <roscfg.h>
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#include <internal/ntoskrnl.h>
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#include <internal/i386/segment.h>
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#define EXCEPTION_UNWINDING 0x02
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#define EREC_FLAGS 0x04
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#define ExceptionContinueExecution 0
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#define ExceptionContinueSearch 1
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#define ExceptionNestedException 2
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#define ExceptionCollidedUnwind 3
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//.globl _RtlpExecuteHandlerForException
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//.globl _RtlpExecuteHandlerForUnwind
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#define CONTEXT_FLAGS 0x00
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#define CONTEXT_SEGGS 0x8C
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#define CONTEXT_SEGFS 0x90
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#define CONTEXT_SEGES 0x94
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#define CONTEXT_SEGDS 0x98
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#define CONTEXT_EDI 0x9C
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#define CONTEXT_ESI 0xA0
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#define CONTEXT_EBX 0xA4
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#define CONTEXT_EDX 0xA8
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#define CONTEXT_ECX 0xAC
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#define CONTEXT_EAX 0xB0
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#define CONTEXT_EBP 0xB4
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#define CONTEXT_EIP 0xB8
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#define CONTEXT_SEGCS 0xBC
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#define CONTEXT_EFLAGS 0xC0
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#define CONTEXT_ESP 0xC4
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#define CONTEXT_SEGSS 0xC8
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#define RCC_CONTEXT 0x08
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VOID STDCALL
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AsmDebug(ULONG Value);
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// EAX = value to print
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__declspec(naked)
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void do_debug()
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{
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__asm
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{
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pusha
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push eax
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call AsmDebug
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popa
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ret
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}
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}
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#define REH_ERECORD 0x08
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#define REH_RFRAME 0x0C
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#define REH_CONTEXT 0x10
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#define REH_DCONTEXT 0x14
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#define REH_EROUTINE 0x18
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// Parameters:
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// None
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// Registers:
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// [EBP+08h] - PEXCEPTION_RECORD ExceptionRecord
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// [EBP+0Ch] - PEXCEPTION_REGISTRATION RegistrationFrame
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// [EBP+10h] - PVOID Context
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// [EBP+14h] - PVOID DispatcherContext
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// [EBP+18h] - PEXCEPTION_HANDLER ExceptionRoutine
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// EDX - Address of protecting exception handler
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// Returns:
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// EXCEPTION_DISPOSITION
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// Notes:
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// Setup the protecting exception handler and call the exception
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// handler in the right context.
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__declspec(naked)
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void RtlpExecuteHandler()
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{
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__asm
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{
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push ebp
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mov ebp, esp
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push REH_RFRAME[ebp]
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push edx
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push fs:0x0
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mov fs:0x0, esp
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// Prepare to call the exception handler
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push REH_DCONTEXT[ebp]
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push REH_CONTEXT[ebp]
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push REH_RFRAME[ebp]
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push REH_ERECORD[ebp]
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// Now call the exception handler
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mov eax, REH_EROUTINE[ebp]
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call eax
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cmp fs:0x0, -1
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jne reh_stack_looks_ok
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// This should not happen
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push 0
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push 0
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push 0
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push 0
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call RtlAssert
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reh_loop:
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jmp reh_loop
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reh_stack_looks_ok:
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mov esp, fs:0x0
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// Return to the 'front-end' for this function
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pop dword ptr fs:0x0
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mov esp, ebp
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pop ebp
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ret
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}
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}
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#if 0
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#endif // 0
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#define REP_ERECORD 0x04
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#define REP_RFRAME 0x08
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#define REP_CONTEXT 0x0C
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#define REP_DCONTEXT 0x10
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// Parameters:
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// [ESP+04h] - PEXCEPTION_RECORD ExceptionRecord
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// [ESP+08h] - PEXCEPTION_REGISTRATION RegistrationFrame
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// [ESP+0Ch] - PCONTEXT Context
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// [ESP+10h] - PVOID DispatcherContext
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// Registers:
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// None
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// Returns:
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// EXCEPTION_DISPOSITION
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// Notes:
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// This exception handler protects the exception handling
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// mechanism by detecting nested exceptions.
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__declspec(naked)
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void RtlpExceptionProtector()
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{
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__asm
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{
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mov eax, ExceptionContinueSearch
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mov ecx, REP_ERECORD[esp]
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test EREC_FLAGS[ecx], EXCEPTION_UNWINDING
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jnz rep_end
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// Unwinding is not taking place, so return ExceptionNestedException
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// Set DispatcherContext field to the exception registration for the
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// exception handler that executed when a nested exception occurred
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mov ecx, REP_DCONTEXT[esp]
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mov eax, REP_RFRAME[esp]
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mov [ecx], eax
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mov eax, ExceptionNestedException
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rep_end:
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ret
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}
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}
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// Parameters:
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// [ESP+04h] - PEXCEPTION_RECORD ExceptionRecord
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// [ESP+08h] - PEXCEPTION_REGISTRATION RegistrationFrame
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// [ESP+0Ch] - PCONTEXT Context
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// [ESP+10h] - PVOID DispatcherContext
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// [ESP+14h] - PEXCEPTION_HANDLER ExceptionHandler
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// Registers:
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// None
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// Returns:
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// EXCEPTION_DISPOSITION
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// Notes:
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// Front-end
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__declspec(naked)
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void RtlpExecuteHandlerForException()
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{
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__asm
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{
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mov edx, RtlpExceptionProtector
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jmp RtlpExecuteHandler
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}
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}
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#define RUP_ERECORD 0x04
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#define RUP_RFRAME 0x08
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#define RUP_CONTEXT 0x0C
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#define RUP_DCONTEXT 0x10
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// Parameters:
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// [ESP+04h] - PEXCEPTION_RECORD ExceptionRecord
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// [ESP+08h] - PEXCEPTION_REGISTRATION RegistrationFrame
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// [ESP+0Ch] - PCONTEXT Context
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// [ESP+10h] - PVOID DispatcherContext
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// Registers:
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// None
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// Returns:
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// EXCEPTION_DISPOSITION
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// Notes:
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// This exception handler protects the exception handling
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// mechanism by detecting collided unwinds.
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__declspec(naked)
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void RtlpUnwindProtector()
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{
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__asm
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{
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mov eax, ExceptionContinueSearch
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mov RUP_ERECORD[esp], ecx
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test EREC_FLAGS[ecx], EXCEPTION_UNWINDING
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jz rup_end
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// Unwinding is taking place, so return ExceptionCollidedUnwind
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mov ecx, RUP_RFRAME[esp]
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mov edx, RUP_DCONTEXT[esp]
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// Set DispatcherContext field to the exception registration for the
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// exception handler that executed when a collision occurred
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mov eax, RUP_RFRAME[ecx]
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mov [edx], eax
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mov eax, ExceptionCollidedUnwind
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rup_end:
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ret
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}
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}
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// Parameters:
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// [ESP+04h] - PEXCEPTION_RECORD ExceptionRecord
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// [ESP+08h] - PEXCEPTION_REGISTRATION RegistrationFrame
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// [ESP+0Ch] - PCONTEXT Context
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// [ESP+10h] - PVOID DispatcherContext
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// [ESP+14h] - PEXCEPTION_HANDLER ExceptionHandler
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// Registers:
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// None
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// Returns:
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// EXCEPTION_DISPOSITION
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__declspec(naked)
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void RtlpExecuteHandlerForUnwind()
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{
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__asm mov edx, RtlpUnwindProtector
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__asm jmp RtlpExecuteHandler
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}
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