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Sweden-Number/dlls/krnl386.exe16/wowthunk.c

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/*
* Win32 WOW Generic Thunk API
*
* Copyright 1999 Ulrich Weigand
*
* 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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
*/
#include "config.h"
#include "wine/port.h"
#include <assert.h>
#include <stdarg.h>
#include <errno.h>
#include "wine/winbase16.h"
#include "windef.h"
#include "winbase.h"
#include "winerror.h"
#include "wownt32.h"
#include "excpt.h"
#include "winternl.h"
#include "kernel16_private.h"
#include "wine/exception.h"
#include "wine/debug.h"
WINE_DEFAULT_DEBUG_CHANNEL(thunk);
WINE_DECLARE_DEBUG_CHANNEL(relay);
WINE_DECLARE_DEBUG_CHANNEL(snoop);
/* symbols exported from relay16.s */
extern DWORD WINAPI wine_call_to_16( FARPROC16 target, DWORD cbArgs, PEXCEPTION_HANDLER handler );
extern void WINAPI wine_call_to_16_regs( CONTEXT *context, DWORD cbArgs, PEXCEPTION_HANDLER handler );
extern void __wine_call_to_16_ret(void);
extern void CALL32_CBClient_Ret(void);
extern void CALL32_CBClientEx_Ret(void);
extern void DPMI_PendingEventCheck(void);
extern void DPMI_PendingEventCheck_Cleanup(void);
extern void DPMI_PendingEventCheck_Return(void);
extern BYTE __wine_call16_start[];
extern BYTE __wine_call16_end[];
static SEGPTR call16_ret_addr; /* segptr to __wine_call_to_16_ret routine */
static WORD dpmi_checker_selector;
static DWORD dpmi_checker_offset_call;
static DWORD dpmi_checker_offset_cleanup;
static DWORD dpmi_checker_offset_return;
/***********************************************************************
* WOWTHUNK_Init
*/
BOOL WOWTHUNK_Init(void)
{
/* allocate the code selector for CallTo16 routines */
LDT_ENTRY entry;
WORD codesel = wine_ldt_alloc_entries(1);
if (!codesel) return FALSE;
wine_ldt_set_base( &entry, __wine_call16_start );
wine_ldt_set_limit( &entry, (BYTE *)(&CallTo16_TebSelector + 1) - __wine_call16_start - 1 );
wine_ldt_set_flags( &entry, WINE_LDT_FLAGS_CODE | WINE_LDT_FLAGS_32BIT );
wine_ldt_set_entry( codesel, &entry );
/* Patch the return addresses for CallTo16 routines */
CallTo16_DataSelector = wine_get_ds();
call16_ret_addr = MAKESEGPTR( codesel, (BYTE *)__wine_call_to_16_ret - __wine_call16_start );
CALL32_CBClient_RetAddr =
MAKESEGPTR( codesel, (BYTE *)CALL32_CBClient_Ret - __wine_call16_start );
CALL32_CBClientEx_RetAddr =
MAKESEGPTR( codesel, (BYTE *)CALL32_CBClientEx_Ret - __wine_call16_start );
/* Prepare selector and offsets for DPMI event checking. */
dpmi_checker_selector = codesel;
dpmi_checker_offset_call = (BYTE *)DPMI_PendingEventCheck - __wine_call16_start;
dpmi_checker_offset_cleanup = (BYTE *)DPMI_PendingEventCheck_Cleanup - __wine_call16_start;
dpmi_checker_offset_return = (BYTE *)DPMI_PendingEventCheck_Return - __wine_call16_start;
if (TRACE_ON(relay) || TRACE_ON(snoop)) RELAY16_InitDebugLists();
return TRUE;
}
/*************************************************************
* fix_selector
*
* Fix a selector load that caused an exception if it's in the
* 16-bit relay code.
*/
static BOOL fix_selector( CONTEXT *context )
{
WORD *stack;
BYTE *instr = (BYTE *)context->Eip;
if (instr < __wine_call16_start || instr >= __wine_call16_end) return FALSE;
/* skip prefixes */
while (*instr == 0x66 || *instr == 0x67) instr++;
switch(instr[0])
{
case 0x07: /* pop es */
case 0x17: /* pop ss */
case 0x1f: /* pop ds */
break;
case 0x0f: /* extended instruction */
switch(instr[1])
{
case 0xa1: /* pop fs */
case 0xa9: /* pop gs */
break;
default:
return FALSE;
}
break;
default:
return FALSE;
}
stack = wine_ldt_get_ptr( context->SegSs, context->Esp );
TRACE( "fixing up selector %x for pop instruction\n", *stack );
*stack = 0;
return TRUE;
}
/*************************************************************
* insert_event_check
*
* Make resuming the context check for pending DPMI events
* before the original context is restored. This is required
* because DPMI events are asynchronous, they are blocked while
* Wine 32-bit code is being executed and we want to prevent
* a race when returning back to 16-bit or 32-bit DPMI context.
*/
static void insert_event_check( CONTEXT *context )
{
char *stack = wine_ldt_get_ptr( context->SegSs, context->Esp );
/* don't do event check while in system code */
if (wine_ldt_is_system(context->SegCs))
return;
if(context->SegCs == dpmi_checker_selector &&
context->Eip >= dpmi_checker_offset_call &&
context->Eip <= dpmi_checker_offset_cleanup)
{
/*
* Nested call. Stack will be preserved.
*/
}
else if(context->SegCs == dpmi_checker_selector &&
context->Eip == dpmi_checker_offset_return)
{
/*
* Nested call. We have just finished popping the fs
* register, lets put it back into stack.
*/
stack -= sizeof(WORD);
*(WORD*)stack = context->SegFs;
context->Esp -= 2;
}
else
{
/*
* Call is not nested.
* Push modified registers into stack.
* These will be popped by the assembler stub.
*/
stack -= sizeof(DWORD);
*(DWORD*)stack = context->EFlags;
stack -= sizeof(DWORD);
*(DWORD*)stack = context->SegCs;
stack -= sizeof(DWORD);
*(DWORD*)stack = context->Eip;
stack -= sizeof(WORD);
*(WORD*)stack = context->SegFs;
context->Esp -= 14;
}
/*
* Modify the context so that we jump into assembler stub.
* TEB access is made easier by providing the stub
* with the correct fs register value.
*/
context->SegCs = dpmi_checker_selector;
context->Eip = dpmi_checker_offset_call;
context->SegFs = wine_get_fs();
}
/*************************************************************
* call16_handler
*
* Handler for exceptions occurring in 16-bit code.
*/
static DWORD call16_handler( EXCEPTION_RECORD *record, EXCEPTION_REGISTRATION_RECORD *frame,
CONTEXT *context, EXCEPTION_REGISTRATION_RECORD **pdispatcher )
{
if (record->ExceptionFlags & (EH_UNWINDING | EH_EXIT_UNWIND))
{
/* unwinding: restore the stack pointer in the TEB, and leave the Win16 mutex */
STACK32FRAME *frame32 = CONTAINING_RECORD(frame, STACK32FRAME, frame);
NtCurrentTeb()->WOW32Reserved = (void *)frame32->frame16;
_LeaveWin16Lock();
}
else if (record->ExceptionCode == EXCEPTION_ACCESS_VIOLATION ||
record->ExceptionCode == EXCEPTION_PRIV_INSTRUCTION)
{
if (wine_ldt_is_system(context->SegCs))
{
if (fix_selector( context )) return ExceptionContinueExecution;
}
else
{
SEGPTR gpHandler;
DWORD ret = __wine_emulate_instruction( record, context );
/*
* Insert check for pending DPMI events. Note that this
* check must be inserted after instructions have been
* emulated because the instruction emulation requires
* original CS:IP and the emulation may change TEB.dpmi_vif.
*/
if(get_vm86_teb_info()->dpmi_vif)
insert_event_check( context );
if (ret != ExceptionContinueSearch) return ret;
/* check for Win16 __GP handler */
if ((gpHandler = HasGPHandler16( MAKESEGPTR( context->SegCs, context->Eip ) )))
{
WORD *stack = wine_ldt_get_ptr( context->SegSs, context->Esp );
*--stack = context->SegCs;
*--stack = context->Eip;
if (!IS_SELECTOR_32BIT(context->SegSs))
context->Esp = MAKELONG( LOWORD(context->Esp - 2*sizeof(WORD)),
HIWORD(context->Esp) );
else
context->Esp -= 2*sizeof(WORD);
context->SegCs = SELECTOROF( gpHandler );
context->Eip = OFFSETOF( gpHandler );
return ExceptionContinueExecution;
}
}
}
else if (record->ExceptionCode == EXCEPTION_VM86_STI)
{
insert_event_check( context );
}
return ExceptionContinueSearch;
}
/*************************************************************
* vm86_handler
*
* Handler for exceptions occurring in vm86 code.
*/
static DWORD vm86_handler( EXCEPTION_RECORD *record, EXCEPTION_REGISTRATION_RECORD *frame,
CONTEXT *context, EXCEPTION_REGISTRATION_RECORD **pdispatcher )
{
if (record->ExceptionFlags & (EH_UNWINDING | EH_EXIT_UNWIND))
return ExceptionContinueSearch;
if (record->ExceptionCode == EXCEPTION_ACCESS_VIOLATION ||
record->ExceptionCode == EXCEPTION_PRIV_INSTRUCTION)
{
return __wine_emulate_instruction( record, context );
}
return ExceptionContinueSearch;
}
/*
* 32-bit WOW routines (in WOW32, but actually forwarded to KERNEL32)
*/
/**********************************************************************
* K32WOWGetDescriptor (KERNEL32.70)
*/
BOOL WINAPI K32WOWGetDescriptor( SEGPTR segptr, LPLDT_ENTRY ldtent )
{
return GetThreadSelectorEntry( GetCurrentThread(),
segptr >> 16, ldtent );
}
/**********************************************************************
* K32WOWGetVDMPointer (KERNEL32.56)
*/
LPVOID WINAPI K32WOWGetVDMPointer( DWORD vp, DWORD dwBytes, BOOL fProtectedMode )
{
/* FIXME: add size check too */
if ( fProtectedMode )
return MapSL( vp );
else
return DOSMEM_MapRealToLinear( vp );
}
/**********************************************************************
* K32WOWGetVDMPointerFix (KERNEL32.68)
*/
LPVOID WINAPI K32WOWGetVDMPointerFix( DWORD vp, DWORD dwBytes, BOOL fProtectedMode )
{
/*
* Hmmm. According to the docu, we should call:
*
* GlobalFix16( SELECTOROF(vp) );
*
* But this is unnecessary under Wine, as we never move global
* memory segments in linear memory anyway.
*
* (I'm not so sure what we are *supposed* to do if
* fProtectedMode is TRUE, anyway ...)
*/
return K32WOWGetVDMPointer( vp, dwBytes, fProtectedMode );
}
/**********************************************************************
* K32WOWGetVDMPointerUnfix (KERNEL32.69)
*/
VOID WINAPI K32WOWGetVDMPointerUnfix( DWORD vp )
{
/*
* See above why we don't call:
*
* GlobalUnfix16( SELECTOROF(vp) );
*
*/
}
/**********************************************************************
* K32WOWGlobalAlloc16 (KERNEL32.59)
*/
WORD WINAPI K32WOWGlobalAlloc16( WORD wFlags, DWORD cb )
{
return (WORD)GlobalAlloc16( wFlags, cb );
}
/**********************************************************************
* K32WOWGlobalFree16 (KERNEL32.62)
*/
WORD WINAPI K32WOWGlobalFree16( WORD hMem )
{
return (WORD)GlobalFree16( (HGLOBAL16)hMem );
}
/**********************************************************************
* K32WOWGlobalUnlock16 (KERNEL32.61)
*/
BOOL WINAPI K32WOWGlobalUnlock16( WORD hMem )
{
return (BOOL)GlobalUnlock16( (HGLOBAL16)hMem );
}
/**********************************************************************
* K32WOWGlobalAllocLock16 (KERNEL32.63)
*/
DWORD WINAPI K32WOWGlobalAllocLock16( WORD wFlags, DWORD cb, WORD *phMem )
{
WORD hMem = K32WOWGlobalAlloc16( wFlags, cb );
if (phMem) *phMem = hMem;
return K32WOWGlobalLock16( hMem );
}
/**********************************************************************
* K32WOWGlobalLockSize16 (KERNEL32.65)
*/
DWORD WINAPI K32WOWGlobalLockSize16( WORD hMem, PDWORD pcb )
{
if ( pcb )
*pcb = GlobalSize16( (HGLOBAL16)hMem );
return K32WOWGlobalLock16( hMem );
}
/**********************************************************************
* K32WOWGlobalUnlockFree16 (KERNEL32.64)
*/
WORD WINAPI K32WOWGlobalUnlockFree16( DWORD vpMem )
{
if ( !K32WOWGlobalUnlock16( HIWORD(vpMem) ) )
return FALSE;
return K32WOWGlobalFree16( HIWORD(vpMem) );
}
/**********************************************************************
* K32WOWYield16 (KERNEL32.66)
*/
VOID WINAPI K32WOWYield16( void )
{
/*
* This does the right thing for both Win16 and Win32 tasks.
* More or less, at least :-/
*/
Yield16();
}
/**********************************************************************
* K32WOWDirectedYield16 (KERNEL32.67)
*/
VOID WINAPI K32WOWDirectedYield16( WORD htask16 )
{
/*
* Argh. Our scheduler doesn't like DirectedYield by Win32
* tasks at all. So we do hope that this routine is indeed
* only ever called by Win16 tasks that have thunked up ...
*/
DirectedYield16( (HTASK16)htask16 );
}
/***********************************************************************
* K32WOWHandle32 (KERNEL32.57)
*/
HANDLE WINAPI K32WOWHandle32( WORD handle, WOW_HANDLE_TYPE type )
{
switch ( type )
{
case WOW_TYPE_HWND:
case WOW_TYPE_HMENU:
case WOW_TYPE_HDWP:
case WOW_TYPE_HDROP:
case WOW_TYPE_HDC:
case WOW_TYPE_HFONT:
case WOW_TYPE_HRGN:
case WOW_TYPE_HBITMAP:
case WOW_TYPE_HBRUSH:
case WOW_TYPE_HPALETTE:
case WOW_TYPE_HPEN:
case WOW_TYPE_HACCEL:
return (HANDLE)(ULONG_PTR)handle;
case WOW_TYPE_HMETAFILE:
FIXME( "conversion of metafile handles not supported yet\n" );
return (HANDLE)(ULONG_PTR)handle;
case WOW_TYPE_HTASK:
return ((TDB *)GlobalLock16(handle))->teb->ClientId.UniqueThread;
case WOW_TYPE_FULLHWND:
FIXME( "conversion of full window handles not supported yet\n" );
return (HANDLE)(ULONG_PTR)handle;
default:
ERR( "handle 0x%04x of unknown type %d\n", handle, type );
return (HANDLE)(ULONG_PTR)handle;
}
}
/***********************************************************************
* K32WOWHandle16 (KERNEL32.58)
*/
WORD WINAPI K32WOWHandle16( HANDLE handle, WOW_HANDLE_TYPE type )
{
switch ( type )
{
case WOW_TYPE_HWND:
case WOW_TYPE_HMENU:
case WOW_TYPE_HDWP:
case WOW_TYPE_HDROP:
case WOW_TYPE_HDC:
case WOW_TYPE_HFONT:
case WOW_TYPE_HRGN:
case WOW_TYPE_HBITMAP:
case WOW_TYPE_HBRUSH:
case WOW_TYPE_HPALETTE:
case WOW_TYPE_HPEN:
case WOW_TYPE_HACCEL:
case WOW_TYPE_FULLHWND:
if ( HIWORD(handle ) )
ERR( "handle %p of type %d has non-zero HIWORD\n", handle, type );
return LOWORD(handle);
case WOW_TYPE_HMETAFILE:
FIXME( "conversion of metafile handles not supported yet\n" );
return LOWORD(handle);
case WOW_TYPE_HTASK:
return TASK_GetTaskFromThread( (DWORD)handle );
default:
ERR( "handle %p of unknown type %d\n", handle, type );
return LOWORD(handle);
}
}
/**********************************************************************
* K32WOWCallback16Ex (KERNEL32.55)
*/
BOOL WINAPI K32WOWCallback16Ex( DWORD vpfn16, DWORD dwFlags,
DWORD cbArgs, LPVOID pArgs, LPDWORD pdwRetCode )
{
/*
* Arguments must be prepared in the correct order by the caller
* (both for PASCAL and CDECL calling convention), so we simply
* copy them to the 16-bit stack ...
*/
char *stack = (char *)CURRENT_STACK16 - cbArgs;
memcpy( stack, pArgs, cbArgs );
if (dwFlags & (WCB16_REGS|WCB16_REGS_LONG))
{
CONTEXT *context = (CONTEXT *)pdwRetCode;
if (TRACE_ON(relay))
{
DWORD count = cbArgs / sizeof(WORD);
WORD * wstack = (WORD *)stack;
TRACE_(relay)( "\1CallTo16(func=%04x:%04x", context->SegCs, LOWORD(context->Eip) );
while (count) TRACE_(relay)( ",%04x", wstack[--count] );
TRACE_(relay)( ") ss:sp=%04x:%04x ax=%04x bx=%04x cx=%04x dx=%04x si=%04x di=%04x bp=%04x ds=%04x es=%04x\n",
SELECTOROF(NtCurrentTeb()->WOW32Reserved),
OFFSETOF(NtCurrentTeb()->WOW32Reserved),
(WORD)context->Eax, (WORD)context->Ebx, (WORD)context->Ecx,
(WORD)context->Edx, (WORD)context->Esi, (WORD)context->Edi,
(WORD)context->Ebp, (WORD)context->SegDs, (WORD)context->SegEs );
SYSLEVEL_CheckNotLevel( 2 );
}
if (context->EFlags & 0x00020000) /* v86 mode */
{
EXCEPTION_REGISTRATION_RECORD frame;
frame.Handler = vm86_handler;
errno = 0;
__wine_push_frame( &frame );
__wine_enter_vm86( context );
__wine_pop_frame( &frame );
if (errno != 0) /* enter_vm86 will fail with ENOSYS on x64 kernels */
{
WARN("__wine_enter_vm86 failed (errno=%d)\n", errno);
if (errno == ENOSYS)
SetLastError(ERROR_NOT_SUPPORTED);
else
SetLastError(ERROR_GEN_FAILURE);
return FALSE;
}
}
else
{
/* push return address */
if (dwFlags & WCB16_REGS_LONG)
{
stack -= sizeof(DWORD);
*((DWORD *)stack) = HIWORD(call16_ret_addr);
stack -= sizeof(DWORD);
*((DWORD *)stack) = LOWORD(call16_ret_addr);
cbArgs += 2 * sizeof(DWORD);
}
else
{
stack -= sizeof(SEGPTR);
*((SEGPTR *)stack) = call16_ret_addr;
cbArgs += sizeof(SEGPTR);
}
/*
* Start call by checking for pending events.
* Note that wine_call_to_16_regs overwrites context stack
* pointer so we may modify it here without a problem.
*/
if (get_vm86_teb_info()->dpmi_vif)
{
context->SegSs = wine_get_ds();
context->Esp = (DWORD)stack;
insert_event_check( context );
cbArgs += (DWORD)stack - context->Esp;
}
_EnterWin16Lock();
wine_call_to_16_regs( context, cbArgs, call16_handler );
_LeaveWin16Lock();
}
if (TRACE_ON(relay))
{
TRACE_(relay)( "\1RetFrom16() ss:sp=%04x:%04x ax=%04x bx=%04x cx=%04x dx=%04x bp=%04x sp=%04x\n",
SELECTOROF(NtCurrentTeb()->WOW32Reserved),
OFFSETOF(NtCurrentTeb()->WOW32Reserved),
(WORD)context->Eax, (WORD)context->Ebx, (WORD)context->Ecx,
(WORD)context->Edx, (WORD)context->Ebp, (WORD)context->Esp );
SYSLEVEL_CheckNotLevel( 2 );
}
}
else
{
DWORD ret;
if (TRACE_ON(relay))
{
DWORD count = cbArgs / sizeof(WORD);
WORD * wstack = (WORD *)stack;
TRACE_(relay)( "\1CallTo16(func=%04x:%04x,ds=%04x",
HIWORD(vpfn16), LOWORD(vpfn16), SELECTOROF(NtCurrentTeb()->WOW32Reserved) );
while (count) TRACE_(relay)( ",%04x", wstack[--count] );
TRACE_(relay)( ") ss:sp=%04x:%04x\n", SELECTOROF(NtCurrentTeb()->WOW32Reserved),
OFFSETOF(NtCurrentTeb()->WOW32Reserved) );
SYSLEVEL_CheckNotLevel( 2 );
}
/* push return address */
stack -= sizeof(SEGPTR);
*((SEGPTR *)stack) = call16_ret_addr;
cbArgs += sizeof(SEGPTR);
/*
* Actually, we should take care whether the called routine cleans up
* its stack or not. Fortunately, our wine_call_to_16 core doesn't rely on
* the callee to do so; after the routine has returned, the 16-bit
* stack pointer is always reset to the position it had before.
*/
_EnterWin16Lock();
ret = wine_call_to_16( (FARPROC16)vpfn16, cbArgs, call16_handler );
if (pdwRetCode) *pdwRetCode = ret;
_LeaveWin16Lock();
if (TRACE_ON(relay))
{
TRACE_(relay)( "\1RetFrom16() ss:sp=%04x:%04x retval=%08x\n",
SELECTOROF(NtCurrentTeb()->WOW32Reserved),
OFFSETOF(NtCurrentTeb()->WOW32Reserved), ret );
SYSLEVEL_CheckNotLevel( 2 );
}
}
return TRUE; /* success */
}
/**********************************************************************
* K32WOWCallback16 (KERNEL32.54)
*/
DWORD WINAPI K32WOWCallback16( DWORD vpfn16, DWORD dwParam )
{
DWORD ret;
if ( !K32WOWCallback16Ex( vpfn16, WCB16_PASCAL,
sizeof(DWORD), &dwParam, &ret ) )
ret = 0L;
return ret;
}
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