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ntdll: Added emulation of ATL thunks for platforms with NX support.

This commit is contained in:
Alexandre Julliard 2006-02-10 15:13:59 +01:00
parent d7187d79bd
commit 57550776ce
1 changed files with 32 additions and 1 deletions
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33
dlls/ntdll/signal_i386.c
View File

@ -902,6 +902,34 @@ static inline int is_privileged_instr( CONTEXT86 *context )
}
#include "pshpack1.h"
struct atl_thunk
{
DWORD movl; /* movl this,4(%esp) */
DWORD this;
BYTE jmp; /* jmp func */
int func;
};
#include "poppack.h"
/**********************************************************************
* check_atl_thunk
*
* Check if code destination is an ATL thunk, and emulate it if so.
*/
static BOOL check_atl_thunk( EXCEPTION_RECORD *rec, CONTEXT *context )
{
struct atl_thunk *thunk = (struct atl_thunk *)rec->ExceptionInformation[1];
if (thunk->movl != 0x042444c7 || thunk->jmp != 0xe9) return FALSE;
*((DWORD *)context->Esp + 1) = thunk->this;
context->Eip = (DWORD_PTR)(&thunk->func + 1) + thunk->func;
TRACE( "emulating ATL thunk at %p, func=%08lx arg=%08lx\n",
thunk, context->Eip, *((DWORD *)context->Esp + 1) );
return TRUE;
}
/***********************************************************************
* setup_exception
*
@ -1026,7 +1054,10 @@ static void WINAPI raise_segv_exception( EXCEPTION_RECORD *rec, CONTEXT *context
{
case EXCEPTION_ACCESS_VIOLATION:
if (rec->NumberParameters == 2)
{
if ((rec->ExceptionInformation[0] == 8) && check_atl_thunk( rec, context )) goto done;
rec->ExceptionCode = VIRTUAL_HandleFault( (void *)rec->ExceptionInformation[1] );
}
break;
case EXCEPTION_DATATYPE_MISALIGNMENT:
/* FIXME: pass through exception handler first? */
@ -1175,7 +1206,7 @@ static HANDLER_DEF(segv_handler)
rec->ExceptionCode = EXCEPTION_ACCESS_VIOLATION;
#ifdef FAULT_ADDRESS
rec->NumberParameters = 2;
rec->ExceptionInformation[0] = (get_error_code(HANDLER_CONTEXT) & 2) != 0;
rec->ExceptionInformation[0] = (get_error_code(HANDLER_CONTEXT) >> 1) & 0x09;
rec->ExceptionInformation[1] = (ULONG_PTR)FAULT_ADDRESS;
#endif
break;