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209 lines
6.8 KiB
C
209 lines
6.8 KiB
C
/*
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* Routines for dynamically building calls to Wine from
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* protected mode applications.
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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 "thread.h"
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#include "wine/debug.h"
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#include "builtin16.h"
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WINE_DEFAULT_DEBUG_CHANNEL(int);
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/*
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* Magic DWORD used to check stack integrity.
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*/
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#define RELAY_MAGIC 0xabcdef00
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/*
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* Memory block for temporary 16-bit stacks used with relay calls.
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*/
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typedef struct {
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DWORD inuse; /* non-zero if stack block is in use */
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DWORD eip; /* saved ip */
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DWORD seg_cs; /* saved cs */
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DWORD esp; /* saved sp */
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DWORD seg_ss; /* saved ss */
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DWORD stack_bottom; /* guard dword */
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BYTE stack[256-7*4]; /* 16-bit stack */
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DWORD stack_top; /* guard dword */
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} RELAY_Stack16;
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/**********************************************************************
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* RELAY_GetPointer
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*
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* Get pointer to stack block when given esp pointing to 16-bit stack
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* inside relay data segment.
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*/
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static RELAY_Stack16 *RELAY_GetPointer( DWORD offset )
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{
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offset = offset / sizeof(RELAY_Stack16) * sizeof(RELAY_Stack16);
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return MapSL(MAKESEGPTR(DOSVM_dpmi_segments->relay_data_sel, offset));
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}
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/**********************************************************************
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* RELAY_MakeShortContext
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*
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* Allocate separate 16-bit stack, make stack pointer point to this
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* stack and make code pointer point to stub that restores everything.
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* So, after this routine, SS and CS are guaranteed to be 16-bit.
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*
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* Note: This might be called from signal handler, so the stack
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* allocation algorithm must be signal safe.
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*/
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static void RELAY_MakeShortContext( CONTEXT86 *context )
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{
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DWORD offset = offsetof(RELAY_Stack16, stack_top);
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RELAY_Stack16 *stack = RELAY_GetPointer( 0 );
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while (stack->inuse && offset < DOSVM_RELAY_DATA_SIZE) {
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stack++;
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offset += sizeof(RELAY_Stack16);
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}
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if (offset >= DOSVM_RELAY_DATA_SIZE)
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ERR( "Too many nested interrupts!\n" );
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stack->inuse = 1;
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stack->eip = context->Eip;
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stack->seg_cs = context->SegCs;
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stack->esp = context->Esp;
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stack->seg_ss = context->SegSs;
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stack->stack_bottom = RELAY_MAGIC;
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stack->stack_top = RELAY_MAGIC;
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context->SegSs = DOSVM_dpmi_segments->relay_data_sel;
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context->Esp = offset;
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context->SegCs = DOSVM_dpmi_segments->relay_code_sel;
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context->Eip = 3;
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}
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/**********************************************************************
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* RELAY_RelayStub
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*
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* This stub is called by __wine_call_from_16_regs in order to marshall
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* relay parameters.
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*/
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static void __stdcall RELAY_RelayStub( DOSRELAY proc,
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unsigned char *args,
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void *ctx86 )
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{
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if (proc)
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{
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CONTEXT86 *context = (CONTEXT86*)ctx86;
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RELAY_Stack16 *stack = RELAY_GetPointer( context->Esp );
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DWORD old_seg_cs = context->SegCs;
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DWORD old_eip = context->Eip;
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DWORD old_seg_ss = context->SegSs;
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DWORD old_esp = context->Esp;
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context->SegCs = stack->seg_cs;
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context->Eip = stack->eip;
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context->SegSs = stack->seg_ss;
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context->Esp = stack->esp;
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proc( context, *(LPVOID *)args );
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stack->seg_cs = context->SegCs;
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stack->eip = context->Eip;
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stack->seg_ss = context->SegSs;
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stack->esp = context->Esp;
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context->SegCs = old_seg_cs;
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context->Eip = old_eip;
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context->SegSs = old_seg_ss;
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context->Esp = old_esp;
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}
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}
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/**********************************************************************
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* DOSVM_RelayHandler
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*
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* Restore saved code and stack pointers and release stack block.
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*/
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void DOSVM_RelayHandler( CONTEXT86 *context )
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{
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RELAY_Stack16 *stack = RELAY_GetPointer( context->Esp );
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context->SegSs = stack->seg_ss;
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context->Esp = stack->esp;
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context->SegCs = stack->seg_cs;
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context->Eip = stack->eip;
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if (!stack->inuse ||
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stack->stack_bottom != RELAY_MAGIC ||
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stack->stack_top != RELAY_MAGIC)
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ERR( "Stack corrupted!\n" );
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stack->inuse = 0;
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}
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/**********************************************************************
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* DOSVM_BuildCallFrame
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*
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* Modifies the context so that return to context calls DOSRELAY and
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* only after return from DOSRELAY the original context will be returned to.
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*/
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void DOSVM_BuildCallFrame( CONTEXT86 *context, DOSRELAY relay, LPVOID data )
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{
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WORD *stack;
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WORD code_sel = DOSVM_dpmi_segments->relay_code_sel;
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/*
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* Allocate separate stack for relay call.
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*/
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RELAY_MakeShortContext( context );
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/*
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* Get stack pointer after RELAY_MakeShortContext.
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*/
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stack = CTX_SEG_OFF_TO_LIN(context, context->SegSs, context->Esp);
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/*
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* Build call frame.
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*/
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*(--stack) = HIWORD(data); /* argument.hiword */
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*(--stack) = LOWORD(data); /* argument.loword */
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*(--stack) = context->SegCs; /* STACK16FRAME.cs */
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*(--stack) = LOWORD(context->Eip); /* STACK16FRAME.ip */
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*(--stack) = LOWORD(context->Ebp); /* STACK16FRAME.bp */
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*(--stack) = HIWORD(relay); /* STACK16FRAME.entry_point.hiword */
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*(--stack) = LOWORD(relay); /* STACK16FRAME.entry_point.loword */
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*(--stack) = 0; /* STACK16FRAME.entry_ip */
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*(--stack) = HIWORD(RELAY_RelayStub); /* STACK16FRAME.relay.hiword */
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*(--stack) = LOWORD(RELAY_RelayStub); /* STACK16FRAME.relay.loword */
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*(--stack) = 0; /* STACK16FRAME.module_cs.hiword */
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*(--stack) = code_sel; /* STACK16FRAME.module_cs.loword */
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*(--stack) = 0; /* STACK16FRAME.callfrom_ip.hiword */
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*(--stack) = 0; /* STACK16FRAME.callfrom_ip.loword */
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/*
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* Adjust stack and code pointers.
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*/
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ADD_LOWORD( context->Esp, -28 );
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context->SegCs = wine_get_cs();
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context->Eip = (DWORD)__wine_call_from_16_regs;
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}
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