472 lines
12 KiB
NASM
472 lines
12 KiB
NASM
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page ,132
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subttl emerror.asm - Emulator error handler
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;***
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;emerror.asm - Emulator error handler
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;
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; Microsoft Confidential
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;
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; Copyright (c) Microsoft Corporation 1987, 1991
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;
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; All Rights Reserved
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;
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;Purpose:
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; Emulator error handler
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;
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;Revision History: (also see emulator.hst)
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;
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; 10/30/89 WAJ Added this header.
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; 11/15/89 WAJ Major changes for Dos32RaiseExcpetion().
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; 12/01/89 WAJ Now set cbExceptionInfo correctly.
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; 02/08/90 WAJ Fixed GP fault in 32 bit exception handler.
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; 09/03/91 JWM Modified entry/exit sequence for DOSX32.
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; 02/15/92 JWM Adapted for NT.
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;
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;*******************************************************************************
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ifdef _DOS32EXT
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include except32.inc
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endif
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;*** error_return - return to user code (regardless of error)
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;
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; This macro returns to user code. It goes to some lengths
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; to restore the flags on the instruction immediately before
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; the return so that any pending trace trap will be
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; acknowledged immediately after the retfd (and before the
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; next user instruction) instead of after the instruction
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; following the return as would be the case if we returned
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; using iretd.
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;
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; ENTRY ((SS:ESP)) = user's EAX
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; ((SS:ESP)+4) = return EIP
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; ((SS:ESP)+8) = return CS
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; ((SS:ESP)+12) = user's EFLAGS
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; EXIT return to user program, above arguments
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; popped off stack, user's EAX and EFLAGS
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; restored.
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error_return macro noerror
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ifdef _DOS32EXT
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sti ; JWM, 9/3/91
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push dword ptr [esp+8] ; JWM, 9/6/91
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popfd ; JWM, 9/6/91
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endif ; DOS32EXT
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ifdef NT386
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if DBG
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push dword ptr [esp+8] ; On checked build, allow
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popfd ; single step to work
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endif
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endif
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iretd
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endm
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TESTif macro nam
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mov bl,err&nam ; default error number
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if (nam ge 100h)
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test ah,nam/256
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else ;not (nam ge 100h)
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test al,nam
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endif ;(nam ge 100h)
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JSNZ signalerror
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endm
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EM_ENTRY eCommonExceptions
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CommonExceptions:
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mov ebx,[esp].[OldLongStatus]
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and ebx,LongSavedFlags ;preserve condition codes, error flags
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or EMSEG:[LongStatusWord],ebx ;merge saved status word, condition codes
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pop eax
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pop ecx
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pop edx
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pop ebx
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add esp,4 ; toss esp value
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pop ebp
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pop esi
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pop edi
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add esp,8 ;toss old PrevCodeOff and StatusWord
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pop ds
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call Emexcept
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error_return noerror
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ifdef _DOS32EXT
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EmExcept PROC C, OldEIP:DWORD, OldCS:DWORD, OldFlags:DWORD
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LOCAL SSAR:DWORD
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LOCAL ec:_DX32_CONTEXT
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;*
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;* Set up SS access rights.
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;*
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push ds
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mov [ec.R_Eax], eax
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GetEmData ds,ax
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mov eax, ss
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lar eax, eax
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mov [SSAR], eax
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;*
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;* Fill in ExceptionContext structure.
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;*
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mov [ec.NPXContextFlags], NPX_CONTEXT_FULL
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mov [ec.R_Edi], edi
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mov [ec.R_Esi], esi
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mov eax, [ebp]
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mov [ec.R_Ebp], eax
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lea eax, [OldFlags+4]
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mov [ec.R_Esp], eax
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mov [ec.R_Ebx], ebx
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mov [ec.R_Edx], edx
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mov [ec.R_Ecx], ecx
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mov eax, EMSEG:[PrevCodeOff]
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mov [ec.R_Eip], eax
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mov eax, [OldFlags]
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mov [ec.EFlags], eax
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mov eax, [OldCS]
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movzx eax,ax
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mov [ec.SegCs], eax
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mov ax,ss
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movzx eax,ax
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mov [ec.SegSs], eax
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pop eax
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movzx eax,ax
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mov [ec.SegDs], eax ; ds was pushed on entry.
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mov ax,es
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movzx eax,ax
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mov [ec.SegEs], eax
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mov ax,fs
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movzx eax,ax
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mov [ec.SegFs], eax
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mov ax,gs
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movzx eax,ax
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mov [ec.SegGs], eax
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lea esi, [ec]
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add esi, 4
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push ebp
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call SaveState
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pop ebp
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lea eax, [ec]
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push ds
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push es
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mov bx, seg FLAT:CURstk
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mov ds, ebx
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mov es, ebx
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push eax
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call DOS32RAISEEXCEPTION
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add esp, 4
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pop es
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pop ds
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RaiseExceptRet:
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or eax, eax
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JZ ExceptNotHandled
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;*
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;* Copy new flags, cs, eip to new stack.
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;*
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mov ds, [ec.SegSs]
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mov esi, [ec.R_Esp] ; ds:esi == new ss:esp
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mov eax, [ec.Eflags] ; set up iretd frame
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mov [esi-4], eax
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mov eax, [ec.SegCs]
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mov [esi-8], eax
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mov eax, [ec.R_Eip]
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mov [esi-12], eax
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;*
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;* Put new stack pointer on stack.
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;*
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push ds
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sub esi, 12
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push esi
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;*
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;* Reset other registers.
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;*
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mov edi, [ec.R_Edi]
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mov esi, [ec.R_Esi]
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mov ebx, [ec.R_Ebx]
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mov edx, [ec.R_Edx]
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mov ecx, [ec.R_Ecx]
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mov eax, [ec.R_Eax]
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mov ds, [ec.SegDs]
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mov es, [ec.SegEs]
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mov fs, [ec.SegFs]
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mov gs, [ec.SegGs]
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mov ebp, [ec.R_Ebp] ; must do this last.
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lss esp, fword ptr [esp] ; reset ss:esp
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sti ; JWM, 9/3/91
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push [esp+8] ; JWM, 9/6/91
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popfd ; JWM, 9/6/91
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iretd ; reset flags, cs, eip
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ExceptNotHandled:
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EmExcept ENDP
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endif ; ifdef _DOS32EXT
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ifdef NT386
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ISIZE equ 4
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ISizeEC equ (ContextFrameLength + ISIZE - 1) and (not (ISIZE - 1))
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ISizeExceptStruct equ (ExceptionRecordLength + ISIZE - 1) and (not (ISIZE - 1))
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ec_off EQU 4+ISizeEc
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estruct_off EQU ec_off+ISizeExceptStruct
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SSAR EQU <[ebp][-4]>
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ec EQU <[ebp][-ec_off]>
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eStruct EQU <[ebp][-estruct_off]>
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OldEIP EQU <ebp+8>
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OldCS EQU <ebp+12>
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OldFlags EQU <ebp+16>
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EmExcept PROC NEAR
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push ebp
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mov ebp,esp
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sub esp,estruct_off
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;*
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;* Set up SS access rights.
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;*
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push ds
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mov [ec.ctx_RegEax], eax
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GetEmData ds,ax
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mov eax, ss
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lar eax, eax
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mov [SSAR], eax
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;*
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;* Fill in ExceptionContext structure.
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;*
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mov dword ptr [ec.ContextFlags], NPX_CONTEXT_FULL
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mov dword ptr [ec.ctx_Cr0NpxState], CR0_EM
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mov [ec.ctx_RegEdi], edi
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mov [ec.ctx_RegEsi], esi
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mov eax, [ebp]
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mov [ec.ctx_RegEbp], eax
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lea eax, [OldFlags+4]
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mov [ec.ctx_RegEsp], eax
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mov [ec.ctx_RegEbx], ebx
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mov [ec.ctx_RegEdx], edx
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mov [ec.ctx_RegEcx], ecx
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mov eax, [OldEIP]
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mov [ec.ctx_RegEip], eax
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mov eax, [OldFlags]
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mov [ec.ctx_EFlags], eax
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mov eax, [OldCS]
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movzx eax,ax
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mov [ec.ctx_SegCs], eax
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mov ax,ss
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movzx eax,ax
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mov [ec.ctx_SegSs], eax
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pop eax
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movzx eax,ax
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mov [ec.ctx_SegDs], eax ; ds was pushed on entry.
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mov ax,es
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movzx eax,ax
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mov [ec.ctx_SegEs], eax
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mov ax,fs
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movzx eax,ax
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mov [ec.ctx_SegFs], eax
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mov ax,gs
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movzx eax,ax
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mov [ec.ctx_SegGs], eax
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lea esi, [ec]
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add esi, ctx_env
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or EMSEG:[StatusWord], 8000H ; set 'busy' bit
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or EMSEG:[SWerr], Summary ; set Summary bit
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or EMSEG:[CURerr], Summary
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mov cl, EMSEG:[ErrMask]
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push ecx
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push ebp
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call SaveState
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pop ebp
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pop ecx
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call GetEMSEGStatusWord ; EAX = status word
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test al, cl ; test status word against mask
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jne short Err00
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ifdef TRACENPX
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mov edx, 0C1020304h ; Raise bogus exception code, to trace with
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jmp short Err50
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endif
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mov al, Invalid
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;
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; According to the floating error priority, we test what is the cause of
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; the NPX error and raise an appropriate exception.
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;
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Err00:
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test al, Invalid ; Invalid Op?
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jz short Err10 ; No, go check next
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mov edx, XCPT_FLOAT_INVALID_OPERATION
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test al, StackFlag ; Stack fault?
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jz short Err50 ; No, go raise invalid op
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mov edx, XCPT_FLOAT_STACK_CHECK
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jmp short Err50 ; Go raise stack fault
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Err10: mov edx, XCPT_FLOAT_DIVIDE_BY_ZERO
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test al, ZeroDivide
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jnz short Err50
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mov edx, XCPT_FLOAT_DENORMAL_OPERAND
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test al, Denormal
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jnz short Err50
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mov edx, XCPT_FLOAT_OVERFLOW
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test al, Overflow
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jnz short Err50
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mov edx, XCPT_FLOAT_UNDERFLOW
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test al, Underflow
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jnz short Err50
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mov edx, XCPT_FLOAT_INEXACT_RESULT
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Err50: mov [eStruct.ExceptionNum], edx
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xor eax,eax
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mov [eStruct.fHandlerFlags], eax
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mov [eStruct.NestedExceptionReportRecord], eax
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mov dword ptr [eStruct.CParameters], 1 ; GeorgioP convention
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mov [eStruct.ErExceptionInformation], eax ; GeorgioP convention
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mov eax, EMSEG:[PrevCodeOff]
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mov [eStruct.ExceptionAddress], eax
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lea edx, [eStruct]
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lea eax, [ec]
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push ds
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push es
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;TRUE, this is a first-chance exception
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stdCall _NtRaiseException,<edx, eax, 1>
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stdCall _RtlRaiseStatus, <eax>
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pop es
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pop ds
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RaiseExceptRet:
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or eax, eax
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JZ ExceptNotHandled
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;*
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;* Copy new flags, cs, eip to new stack.
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;*
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mov ds, [ec.ctx_SegSs]
|
||
|
|
mov esi, [ec.ctx_RegEsp] ; ds:esi == new ss:esp
|
||
|
|
|
||
|
|
mov eax, [ec.ctx_Eflags] ; set up iretd frame
|
||
|
|
mov [esi-4], eax
|
||
|
|
|
||
|
|
mov eax, [ec.ctx_SegCs]
|
||
|
|
mov [esi-8], eax
|
||
|
|
|
||
|
|
mov eax, [ec.ctx_RegEip]
|
||
|
|
mov [esi-12], eax
|
||
|
|
|
||
|
|
;*
|
||
|
|
;* Put new stack pointer on stack.
|
||
|
|
;*
|
||
|
|
|
||
|
|
push ds
|
||
|
|
sub esi, 12
|
||
|
|
push esi
|
||
|
|
|
||
|
|
;*
|
||
|
|
;* Reset other registers.
|
||
|
|
;*
|
||
|
|
|
||
|
|
mov edi, [ec.ctx_RegEdi]
|
||
|
|
mov esi, [ec.ctx_RegEsi]
|
||
|
|
mov ebx, [ec.ctx_RegEbx]
|
||
|
|
mov edx, [ec.ctx_RegEdx]
|
||
|
|
mov ecx, [ec.ctx_RegEcx]
|
||
|
|
mov eax, [ec.ctx_RegEax]
|
||
|
|
mov ds, [ec.ctx_SegDs]
|
||
|
|
mov es, [ec.ctx_SegEs]
|
||
|
|
mov fs, [ec.ctx_SegFs]
|
||
|
|
mov gs, [ec.ctx_SegGs]
|
||
|
|
|
||
|
|
mov ebp, [ec.ctx_RegEbp] ; must do this last.
|
||
|
|
|
||
|
|
lss esp, fword ptr [esp] ; reset ss:esp
|
||
|
|
|
||
|
|
sti ; JWM, 9/3/91
|
||
|
|
push [esp+8] ; JWM, 9/6/91
|
||
|
|
popfd ; JWM, 9/6/91
|
||
|
|
|
||
|
|
iretd ; reset flags, cs, eip
|
||
|
|
|
||
|
|
ExceptNotHandled:
|
||
|
|
EmExcept ENDP
|
||
|
|
|
||
|
|
endif ; ifdef NT386
|
||
|
|
|
||
|
|
int 3 ; Added For BBT, a return here is needed or BBT
|
||
|
|
ret ; has a flow problem.
|
||
|
|
ifdef DEBUG
|
||
|
|
|
||
|
|
lab PageFault
|
||
|
|
mov al, byte ptr cs:[iax]
|
||
|
|
ret
|
||
|
|
endif
|