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RawModeSwitch can now be used to return DPMI application back to

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protected mode.
This commit is contained in:
Jukka Heinonen 2002-05-11 23:00:45 +00:00 committed by Alexandre Julliard
parent 4a0a2ee00e
commit e929a20e6b
1 changed files with 40 additions and 1 deletions
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41
msdos/dpmi.c
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@ -33,6 +33,7 @@
#include "selectors.h"
#include "callback.h"
#include "wine/debug.h"
#include "stackframe.h"
WINE_DEFAULT_DEBUG_CHANNEL(int31);
@ -198,7 +199,45 @@ static void RawModeSwitch( CONTEXT86 *context )
ERR("could not setup real-mode calls\n");
return;
}
else Dosvm.RawModeSwitch( context );
else
{
/*
* FIXME: This routine will not work if it is called
* from 32 bit DPMI program and the program returns
* to protected mode while ESP or EIP is over 0xffff.
* FIXME: This routine will not work if it is not called
* using 16-bit-to-Wine callback glue function.
*/
STACK16FRAME frame = *CURRENT_STACK16;
Dosvm.RawModeSwitch( 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;
}
}
/**********************************************************************