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85 lines
2.7 KiB
C
85 lines
2.7 KiB
C
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/*
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* Interrupt emulation
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*
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* Copyright 2002 Jukka Heinonen
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library 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 GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include "dosexe.h"
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#include "wine/debug.h"
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WINE_DEFAULT_DEBUG_CHANNEL(int);
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/**********************************************************************
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* DOSVM_EmulateInterruptPM
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*
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* Emulate software interrupt in 16-bit or 32-bit protected mode.
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* Called from signal handler when intXX opcode is executed.
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*
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* Pushes interrupt frame to stack and changes instruction
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* pointer to interrupt handler.
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*/
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void WINAPI DOSVM_EmulateInterruptPM( CONTEXT86 *context, BYTE intnum )
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{
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BOOL islong;
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if(context->SegCs == DOSVM_dpmi_segments->int48_sel)
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islong = FALSE;
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else if(DOSVM_IsDos32())
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islong = TRUE;
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else if(IS_SELECTOR_32BIT(context->SegCs)) {
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WARN("Interrupt in 32-bit code and mode is not DPMI32\n");
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islong = TRUE;
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} else
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islong = FALSE;
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/* FIXME: Remove this check when DPMI32 support has been added */
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if(islong) {
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ERR("Interrupts not supported in 32-bit DPMI\n");
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islong = FALSE;
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}
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if(islong)
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{
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FARPROC48 addr = {0,0}; /* FIXME: INT_GetPMHandler48( intnum ); */
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DWORD *stack = CTX_SEG_OFF_TO_LIN(context, context->SegSs, context->Esp);
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/* Push the flags and return address on the stack */
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*(--stack) = context->EFlags;
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*(--stack) = context->SegCs;
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*(--stack) = context->Eip;
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/* Jump to the interrupt handler */
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context->SegCs = addr.selector;
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context->Eip = addr.offset;
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}
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else
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{
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FARPROC16 addr = INT_GetPMHandler( intnum );
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WORD *stack = CTX_SEG_OFF_TO_LIN(context, context->SegSs, context->Esp);
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/* Push the flags and return address on the stack */
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*(--stack) = LOWORD(context->EFlags);
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*(--stack) = context->SegCs;
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*(--stack) = LOWORD(context->Eip);
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/* Jump to the interrupt handler */
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context->SegCs = HIWORD(addr);
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context->Eip = LOWORD(addr);
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}
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if (IS_SELECTOR_32BIT(context->SegSs))
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context->Esp += islong ? -12 : -6;
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else
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ADD_LOWORD( context->Esp, islong ? -12 : -6 );
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}
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