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Update ESP correctly on return from flat thunk routines.

This commit is contained in:
Ulrich Weigand 2000-09-13 20:30:03 +00:00 committed by Alexandre Julliard
parent a761e3dad0
commit 53dbe16cc2
1 changed files with 26 additions and 16 deletions
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42
dlls/kernel/thunk.c
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@ -304,9 +304,13 @@ void WINAPI QT_Thunk( CONTEXT86 *context )
memcpy( (LPBYTE)CURRENT_STACK16 - argsize,
(LPBYTE)ESP_reg(context), argsize );
EAX_reg(context) = CallTo16RegisterShort( &context16, argsize );
EDX_reg(context) = HIWORD(EAX_reg(context));
EAX_reg(context) = LOWORD(EAX_reg(context));
CallTo16RegisterShort( &context16, argsize );
EAX_reg(context) = EAX_reg(&context16);
EDX_reg(context) = EDX_reg(&context16);
ECX_reg(context) = ECX_reg(&context16);
ESP_reg(context) += LOWORD(ESP_reg(&context16)) -
( OFFSETOF( NtCurrentTeb()->cur_stack ) - argsize );
}
@ -427,9 +431,13 @@ void WINAPI FT_Thunk( CONTEXT86 *context )
+ (*(LPBYTE *)arg - oldstack));
}
EAX_reg(context) = CallTo16RegisterShort( &context16, argsize );
EDX_reg(context) = HIWORD(EAX_reg(context));
EAX_reg(context) = LOWORD(EAX_reg(context));
CallTo16RegisterShort( &context16, argsize );
EAX_reg(context) = EAX_reg(&context16);
EDX_reg(context) = EDX_reg(&context16);
ECX_reg(context) = ECX_reg(&context16);
ESP_reg(context) += LOWORD(ESP_reg(&context16)) -
( OFFSETOF( NtCurrentTeb()->cur_stack ) - argsize );
/* Copy modified buffers back to 32-bit stack */
memcpy( oldstack, newstack, argsize );
@ -604,14 +612,9 @@ DWORD WINAPI ThunkInitLS(
* (CallRegisterLongProc instead of CallRegisterShortProc).
*
* Finally, we return to the caller, popping the arguments off
* the stack.
* the stack. The number of arguments to be popped is returned
* in the BL register by the called 16-bit routine.
*
* FIXME: The called function uses EBX to return the number of
* arguments that are to be popped off the caller's stack.
* This is clobbered by the assembly glue, so we simply use
* the original EDX.HI to get the number of arguments.
* (Those two values should be equal anyway ...?)
*
*/
void WINAPI Common32ThkLS( CONTEXT86 *context )
{
@ -635,10 +638,11 @@ void WINAPI Common32ThkLS( CONTEXT86 *context )
memcpy( (LPBYTE)CURRENT_STACK16 - argsize,
(LPBYTE)ESP_reg(context), argsize );
EAX_reg(context) = CallTo16RegisterLong(&context16, argsize + 32);
CallTo16RegisterLong(&context16, argsize + 32);
EAX_reg(context) = EAX_reg(&context16);
/* Clean up caller's stack frame */
ESP_reg(context) += argsize;
ESP_reg(context) += BL_reg(&context16);
}
/***********************************************************************
@ -685,10 +689,16 @@ void WINAPI OT_32ThkLSF( CONTEXT86 *context )
memcpy( (LPBYTE)CURRENT_STACK16 - argsize,
(LPBYTE)ESP_reg(context), argsize );
EAX_reg(context) = CallTo16RegisterShort(&context16, argsize);
CallTo16RegisterShort(&context16, argsize);
EAX_reg(context) = EAX_reg(&context16);
EDX_reg(context) = EDX_reg(&context16);
/* Copy modified buffers back to 32-bit stack */
memcpy( (LPBYTE)ESP_reg(context),
(LPBYTE)CURRENT_STACK16 - argsize, argsize );
ESP_reg(context) += LOWORD(ESP_reg(&context16)) -
( OFFSETOF( NtCurrentTeb()->cur_stack ) - argsize );
}
/***********************************************************************