263 lines
8.6 KiB
C
263 lines
8.6 KiB
C
|
/*
|
||
|
|
* Routines for dynamically building calls to Wine from
|
||
|
|
* protected mode applications.
|
||
|
|
*
|
||
|
|
* Copyright 2002 Jukka Heinonen
|
||
|
|
*
|
||
|
|
* This library is free software; you can redistribute it and/or
|
||
|
|
* modify it under the terms of the GNU Lesser General Public
|
||
|
|
* License as published by the Free Software Foundation; either
|
||
|
|
* version 2.1 of the License, or (at your option) any later version.
|
||
|
|
*
|
||
|
|
* This library is distributed in the hope that it will be useful,
|
||
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
||
|
|
* Lesser General Public License for more details.
|
||
|
|
*
|
||
|
|
* You should have received a copy of the GNU Lesser General Public
|
||
|
|
* License along with this library; if not, write to the Free Software
|
||
|
|
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
||
|
|
*/
|
||
|
|
#include "dosexe.h"
|
||
|
|
#include "stackframe.h"
|
||
|
|
#include "wine/debug.h"
|
||
|
|
#include "builtin16.h"
|
||
|
|
|
||
|
|
WINE_DEFAULT_DEBUG_CHANNEL(int);
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Magic DWORD used to check stack integrity.
|
||
|
|
*/
|
||
|
|
#define RELAY_MAGIC 0xabcdef00
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Memory block for temporary 16-bit stacks used when
|
||
|
|
* 32-bit code calls relay.
|
||
|
|
*/
|
||
|
|
typedef struct {
|
||
|
|
DWORD inuse; /* non-zero if stack block is in use */
|
||
|
|
DWORD eip; /* saved ip */
|
||
|
|
DWORD seg_cs; /* saved cs */
|
||
|
|
DWORD esp; /* saved sp */
|
||
|
|
DWORD seg_ss; /* saved ss */
|
||
|
|
DWORD stack_bottom; /* guard dword */
|
||
|
|
BYTE stack[256-7*4]; /* 16-bit stack */
|
||
|
|
DWORD stack_top; /* guard dword */
|
||
|
|
} RELAY_Stack16;
|
||
|
|
|
||
|
|
|
||
|
|
/**********************************************************************
|
||
|
|
* RELAY_GetPointer
|
||
|
|
*
|
||
|
|
* Get pointer to stack block when given esp pointing to 16-bit stack
|
||
|
|
* inside relay data segment.
|
||
|
|
*/
|
||
|
|
static RELAY_Stack16 *RELAY_GetPointer( DWORD offset )
|
||
|
|
{
|
||
|
|
offset = offset / sizeof(RELAY_Stack16) * sizeof(RELAY_Stack16);
|
||
|
|
return MapSL(MAKESEGPTR(DOSVM_dpmi_segments->relay_data_sel, offset));
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
/**********************************************************************
|
||
|
|
* RELAY_MakeShortContext
|
||
|
|
*
|
||
|
|
* If context is using 32-bit stack or code segment, allocate
|
||
|
|
* 16-bit stack, make stack pointer point to this stack and
|
||
|
|
* make code pointer point to stub that restores everything.
|
||
|
|
* So, after this routine, SS and CS are guaranteed to be 16-bit.
|
||
|
|
*
|
||
|
|
* Note: This might be called from signal handler, so the stack
|
||
|
|
* allocation algorithm must be signal safe.
|
||
|
|
*/
|
||
|
|
static void RELAY_MakeShortContext( CONTEXT86 *context )
|
||
|
|
{
|
||
|
|
if (IS_SELECTOR_32BIT(context->SegCs) || IS_SELECTOR_32BIT(context->SegSs))
|
||
|
|
{
|
||
|
|
DWORD offset = offsetof(RELAY_Stack16, stack_top);
|
||
|
|
RELAY_Stack16 *stack = RELAY_GetPointer( 0 );
|
||
|
|
|
||
|
|
while (stack->inuse && offset < DOSVM_RELAY_DATA_SIZE) {
|
||
|
|
stack++;
|
||
|
|
offset += sizeof(RELAY_Stack16);
|
||
|
|
}
|
||
|
|
|
||
|
|
if (offset >= DOSVM_RELAY_DATA_SIZE)
|
||
|
|
ERR( "Too many nested interrupts!\n" );
|
||
|
|
|
||
|
|
stack->inuse = 1;
|
||
|
|
stack->eip = context->Eip;
|
||
|
|
stack->seg_cs = context->SegCs;
|
||
|
|
stack->esp = context->Esp;
|
||
|
|
stack->seg_ss = context->SegSs;
|
||
|
|
|
||
|
|
stack->stack_bottom = RELAY_MAGIC;
|
||
|
|
stack->stack_top = RELAY_MAGIC;
|
||
|
|
|
||
|
|
context->SegSs = DOSVM_dpmi_segments->relay_data_sel;
|
||
|
|
context->Esp = offset;
|
||
|
|
context->SegCs = DOSVM_dpmi_segments->relay_code_sel;
|
||
|
|
context->Eip = 3;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
/**********************************************************************
|
||
|
|
* RELAY_RelayStub
|
||
|
|
*
|
||
|
|
* This stub is called by __wine_call_from_16_regs in order to marshall
|
||
|
|
* relay parameters.
|
||
|
|
*/
|
||
|
|
static void __stdcall RELAY_RelayStub( DOSRELAY proc,
|
||
|
|
unsigned char *args,
|
||
|
|
void *context )
|
||
|
|
{
|
||
|
|
proc( (CONTEXT86*)context, *(LPVOID *)args );
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
/**********************************************************************
|
||
|
|
* DOSVM_RelayHandler
|
||
|
|
*
|
||
|
|
* Restore saved code and stack pointers and release stack block.
|
||
|
|
*/
|
||
|
|
void DOSVM_RelayHandler( CONTEXT86 *context )
|
||
|
|
{
|
||
|
|
RELAY_Stack16 *stack = RELAY_GetPointer( context->Esp );
|
||
|
|
|
||
|
|
context->SegSs = stack->seg_ss;
|
||
|
|
context->Esp = stack->esp;
|
||
|
|
context->SegCs = stack->seg_cs;
|
||
|
|
context->Eip = stack->eip;
|
||
|
|
|
||
|
|
if (!stack->inuse ||
|
||
|
|
stack->stack_bottom != RELAY_MAGIC ||
|
||
|
|
stack->stack_top != RELAY_MAGIC)
|
||
|
|
ERR( "Stack corrupted!\n" );
|
||
|
|
|
||
|
|
stack->inuse = 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
/**********************************************************************
|
||
|
|
* DOSVM_SaveCallFrame
|
||
|
|
*
|
||
|
|
* Save current call frame. This routine must be called from DOSRELAY
|
||
|
|
* called using DOSVM_BuildCallFrame before the relay modifies stack
|
||
|
|
* pointer. This routine makes sure that the relay can return safely
|
||
|
|
* to application context and that no memory is leaked.
|
||
|
|
*
|
||
|
|
* Note: If DOSVM_BuildCallFrame was called using 32-bit CS or SS,
|
||
|
|
* old values of CS and SS will be lost. This does not matter
|
||
|
|
* since this routine is only used by Raw Mode Switch.
|
||
|
|
*/
|
||
|
|
void DOSVM_SaveCallFrame( CONTEXT86 *context, STACK16FRAME *frame )
|
||
|
|
{
|
||
|
|
*frame = *CURRENT_STACK16;
|
||
|
|
|
||
|
|
/*
|
||
|
|
* If context is using allocated stack, release it.
|
||
|
|
*/
|
||
|
|
if (context->SegSs == DOSVM_dpmi_segments->relay_data_sel)
|
||
|
|
{
|
||
|
|
RELAY_Stack16 *stack = RELAY_GetPointer( context->Esp );
|
||
|
|
|
||
|
|
if (!stack->inuse ||
|
||
|
|
stack->stack_bottom != RELAY_MAGIC ||
|
||
|
|
stack->stack_top != RELAY_MAGIC)
|
||
|
|
ERR( "Stack corrupted!\n" );
|
||
|
|
|
||
|
|
stack->inuse = 0;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
/**********************************************************************
|
||
|
|
* DOSVM_RestoreCallFrame
|
||
|
|
*
|
||
|
|
* Restore saved call frame to currect stack. This routine must always
|
||
|
|
* be called after DOSVM_SaveCallFrame has been called and before returning
|
||
|
|
* from DOSRELAY.
|
||
|
|
*/
|
||
|
|
void DOSVM_RestoreCallFrame( CONTEXT86 *context, STACK16FRAME *frame )
|
||
|
|
{
|
||
|
|
/*
|
||
|
|
* Make sure that CS and SS are 16-bit.
|
||
|
|
*/
|
||
|
|
RELAY_MakeShortContext( context );
|
||
|
|
|
||
|
|
/*
|
||
|
|
* After this function returns to relay code, protected mode
|
||
|
|
* 16 bit stack will contain STACK16FRAME and single WORD
|
||
|
|
* (EFlags, see next comment).
|
||
|
|
*/
|
||
|
|
NtCurrentTeb()->cur_stack =
|
||
|
|
MAKESEGPTR( context->SegSs,
|
||
|
|
context->Esp - sizeof(STACK16FRAME) - sizeof(WORD) );
|
||
|
|
|
||
|
|
/*
|
||
|
|
* After relay code returns to glue function, protected
|
||
|
|
* mode 16 bit stack will contain interrupt return record:
|
||
|
|
* IP, CS and EFlags. Since EFlags is ignored, it won't
|
||
|
|
* need to be initialized.
|
||
|
|
*/
|
||
|
|
context->Esp -= 3 * sizeof(WORD);
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Restore stack frame so that relay code won't be confused.
|
||
|
|
* It should be noted that relay code overwrites IP and CS
|
||
|
|
* in STACK16FRAME with values taken from current CONTEXT86.
|
||
|
|
* These values are what is returned to glue function
|
||
|
|
* (see previous comment).
|
||
|
|
*/
|
||
|
|
*CURRENT_STACK16 = *frame;
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
/**********************************************************************
|
||
|
|
* DOSVM_BuildCallFrame
|
||
|
|
*
|
||
|
|
* Modifies the context so that return to context calls DOSRELAY and
|
||
|
|
* only after return from DOSRELAY the original context will be returned to.
|
||
|
|
*/
|
||
|
|
void DOSVM_BuildCallFrame( CONTEXT86 *context, DOSRELAY relay, LPVOID data )
|
||
|
|
{
|
||
|
|
WORD *stack;
|
||
|
|
WORD code_sel = DOSVM_dpmi_segments->relay_code_sel;
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Make sure that CS and SS are 16-bit.
|
||
|
|
*/
|
||
|
|
RELAY_MakeShortContext( context );
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Get stack pointer after RELAY_MakeShortContext.
|
||
|
|
*/
|
||
|
|
stack = CTX_SEG_OFF_TO_LIN(context, context->SegSs, context->Esp);
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Build call frame.
|
||
|
|
*/
|
||
|
|
*(--stack) = HIWORD(data); /* argument.hiword */
|
||
|
|
*(--stack) = LOWORD(data); /* argument.loword */
|
||
|
|
*(--stack) = context->SegCs; /* STACK16FRAME.cs */
|
||
|
|
*(--stack) = LOWORD(context->Eip); /* STACK16FRAME.ip */
|
||
|
|
*(--stack) = LOWORD(context->Ebp); /* STACK16FRAME.bp */
|
||
|
|
*(--stack) = HIWORD(relay); /* STACK16FRAME.entry_point.hiword */
|
||
|
|
*(--stack) = LOWORD(relay); /* STACK16FRAME.entry_point.loword */
|
||
|
|
*(--stack) = 0; /* STACK16FRAME.entry_ip */
|
||
|
|
*(--stack) = HIWORD(RELAY_RelayStub); /* STACK16FRAME.relay.hiword */
|
||
|
|
*(--stack) = LOWORD(RELAY_RelayStub); /* STACK16FRAME.relay.loword */
|
||
|
|
*(--stack) = 0; /* STACK16FRAME.module_cs.hiword */
|
||
|
|
*(--stack) = code_sel; /* STACK16FRAME.module_cs.loword */
|
||
|
|
*(--stack) = 0; /* STACK16FRAME.callfrom_ip.hiword */
|
||
|
|
*(--stack) = 0; /* STACK16FRAME.callfrom_ip.loword */
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Adjust stack and code pointers.
|
||
|
|
*/
|
||
|
|
ADD_LOWORD( context->Esp, -28 );
|
||
|
|
context->SegCs = wine_get_cs();
|
||
|
|
context->Eip = (DWORD)__wine_call_from_16_regs;
|
||
|
|
}
|