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wine-wine/dlls/krnl386.exe16/relay.c

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/*
* Copyright 1993 Robert J. Amstadt
* Copyright 1995 Alexandre Julliard
* 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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
*/
#include <assert.h>
#include <stdlib.h>
#include <string.h>
#include <stdarg.h>
#include <stdio.h>
#include "windef.h"
#include "winbase.h"
#include "wine/winbase16.h"
#include "winternl.h"
#include "kernel16_private.h"
#include "dosexe.h"
#include "wine/debug.h"
WINE_DEFAULT_DEBUG_CHANNEL(relay);
/*
* Magic DWORD used to check stack integrity.
*/
#define RELAY_MAGIC 0xabcdef00
/*
* Memory block for temporary 16-bit stacks used with relay calls.
*/
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;
static const char **debug_relay_excludelist;
static const char **debug_relay_includelist;
static const char **debug_snoop_excludelist;
static const char **debug_snoop_includelist;
/***********************************************************************
* build_list
*
* Build a function list from a ';'-separated string.
*/
static const char **build_list( const WCHAR *buffer )
{
int count = 1;
const WCHAR *p = buffer;
const char **ret;
while ((p = wcschr( p, ';' )))
{
count++;
p++;
}
/* allocate count+1 pointers, plus the space for a copy of the string */
if ((ret = RtlAllocateHeap( GetProcessHeap(), 0,
(count + 1) * sizeof(char *) + (lstrlenW(buffer) + 1) )))
{
char *str = (char *)(ret + count + 1);
char *p = str;
while ((*str++ = *buffer++));
count = 0;
for (;;)
{
ret[count++] = p;
if (!(p = strchr( p, ';' ))) break;
*p++ = 0;
}
ret[count++] = NULL;
}
return ret;
}
/***********************************************************************
* RELAY16_InitDebugLists
*
* Build the relay include/exclude function lists.
*/
void RELAY16_InitDebugLists(void)
{
OBJECT_ATTRIBUTES attr;
UNICODE_STRING name;
char buffer[1024];
HANDLE root, hkey;
DWORD count;
WCHAR *str;
static const WCHAR configW[] = {'S','o','f','t','w','a','r','e','\\',
'W','i','n','e','\\',
'D','e','b','u','g',0};
static const WCHAR RelayIncludeW[] = {'R','e','l','a','y','I','n','c','l','u','d','e',0};
static const WCHAR RelayExcludeW[] = {'R','e','l','a','y','E','x','c','l','u','d','e',0};
static const WCHAR SnoopIncludeW[] = {'S','n','o','o','p','I','n','c','l','u','d','e',0};
static const WCHAR SnoopExcludeW[] = {'S','n','o','o','p','E','x','c','l','u','d','e',0};
RtlOpenCurrentUser( KEY_READ, &root );
attr.Length = sizeof(attr);
attr.RootDirectory = root;
attr.ObjectName = &name;
attr.Attributes = 0;
attr.SecurityDescriptor = NULL;
attr.SecurityQualityOfService = NULL;
RtlInitUnicodeString( &name, configW );
/* @@ Wine registry key: HKCU\Software\Wine\Debug */
if (NtOpenKey( &hkey, KEY_READ, &attr )) hkey = 0;
NtClose( root );
if (!hkey) return;
str = (WCHAR *)((KEY_VALUE_PARTIAL_INFORMATION *)buffer)->Data;
RtlInitUnicodeString( &name, RelayIncludeW );
if (!NtQueryValueKey( hkey, &name, KeyValuePartialInformation, buffer, sizeof(buffer), &count ))
{
debug_relay_includelist = build_list( str );
}
RtlInitUnicodeString( &name, RelayExcludeW );
if (!NtQueryValueKey( hkey, &name, KeyValuePartialInformation, buffer, sizeof(buffer), &count ))
{
debug_relay_excludelist = build_list( str );
}
RtlInitUnicodeString( &name, SnoopIncludeW );
if (!NtQueryValueKey( hkey, &name, KeyValuePartialInformation, buffer, sizeof(buffer), &count ))
{
debug_snoop_includelist = build_list( str );
}
RtlInitUnicodeString( &name, SnoopExcludeW );
if (!NtQueryValueKey( hkey, &name, KeyValuePartialInformation, buffer, sizeof(buffer), &count ))
{
debug_snoop_excludelist = build_list( str );
}
NtClose( hkey );
}
/***********************************************************************
* check_list
*
* Check if a given module and function is in the list.
*/
static BOOL check_list( const char *module, int ordinal, const char *func, const char **list )
{
char ord_str[10];
sprintf( ord_str, "%d", ordinal );
for(; *list; list++)
{
const char *p = strrchr( *list, '.' );
if (p && p > *list) /* check module and function */
{
int len = p - *list;
if (_strnicmp( module, *list, len-1 ) || module[len]) continue;
if (p[1] == '*' && !p[2]) return TRUE;
if (!strcmp( ord_str, p + 1 )) return TRUE;
if (func && !stricmp( func, p + 1 )) return TRUE;
}
else /* function only */
{
if (func && !stricmp( func, *list )) return TRUE;
}
}
return FALSE;
}
/***********************************************************************
* RELAY_ShowDebugmsgRelay
*
* Simple function to decide if a particular debugging message is
* wanted.
*/
static BOOL RELAY_ShowDebugmsgRelay(const char *module, int ordinal, const char *func)
{
if (debug_relay_excludelist && check_list( module, ordinal, func, debug_relay_excludelist ))
return FALSE;
if (debug_relay_includelist && !check_list( module, ordinal, func, debug_relay_includelist ))
return FALSE;
return TRUE;
}
/***********************************************************************
* SNOOP16_ShowDebugmsgSnoop
*
* Simple function to decide if a particular debugging message is
* wanted.
*/
BOOL SNOOP16_ShowDebugmsgSnoop(const char *module, int ordinal, const char *func)
{
if (debug_snoop_excludelist && check_list( module, ordinal, func, debug_snoop_excludelist ))
return FALSE;
if (debug_snoop_includelist && !check_list( module, ordinal, func, debug_snoop_includelist ))
return FALSE;
return TRUE;
}
/***********************************************************************
* get_entry_point
*
* Return the ordinal, name, and type info corresponding to a CS:IP address.
*/
static const CALLFROM16 *get_entry_point( STACK16FRAME *frame, LPSTR module, LPSTR func, WORD *pOrd )
{
WORD i, max_offset;
register BYTE *p;
NE_MODULE *pModule;
ET_BUNDLE *bundle;
ET_ENTRY *entry;
*pOrd = 0;
if (!(pModule = NE_GetPtr( FarGetOwner16( GlobalHandle16( frame->module_cs ) ))))
return NULL;
max_offset = 0;
bundle = (ET_BUNDLE *)((BYTE *)pModule + pModule->ne_enttab);
do
{
entry = (ET_ENTRY *)((BYTE *)bundle+6);
for (i = bundle->first + 1; i <= bundle->last; i++)
{
if ((entry->offs < frame->entry_ip)
&& (entry->segnum == 1) /* code segment ? */
&& (entry->offs >= max_offset))
{
max_offset = entry->offs;
*pOrd = i;
}
entry++;
}
} while ( (bundle->next)
&& (bundle = (ET_BUNDLE *)((BYTE *)pModule+bundle->next)));
/* Search for the name in the resident names table */
/* (built-in modules have no non-resident table) */
p = (BYTE *)pModule + pModule->ne_restab;
memcpy( module, p + 1, *p );
module[*p] = 0;
while (*p)
{
p += *p + 1 + sizeof(WORD);
if (*(WORD *)(p + *p + 1) == *pOrd) break;
}
memcpy( func, p + 1, *p );
func[*p] = 0;
/* Retrieve entry point call structure */
p = MapSL( MAKESEGPTR( frame->module_cs, frame->callfrom_ip ) );
/* p now points to lret, get the start of CALLFROM16 structure */
return (CALLFROM16 *)(p - FIELD_OFFSET( CALLFROM16, ret ));
}
extern int call_entry_point( void *func, int nb_args, const int *args );
__ASM_GLOBAL_FUNC( call_entry_point,
"pushl %ebp\n\t"
__ASM_CFI(".cfi_adjust_cfa_offset 4\n\t")
__ASM_CFI(".cfi_rel_offset %ebp,0\n\t")
"movl %esp,%ebp\n\t"
__ASM_CFI(".cfi_def_cfa_register %ebp\n\t")
"pushl %esi\n\t"
__ASM_CFI(".cfi_rel_offset %esi,-4\n\t")
"pushl %edi\n\t"
__ASM_CFI(".cfi_rel_offset %edi,-8\n\t")
"movl 12(%ebp),%edx\n\t"
"shll $2,%edx\n\t"
"jz 1f\n\t"
"subl %edx,%esp\n\t"
"andl $~15,%esp\n\t"
"movl 12(%ebp),%ecx\n\t"
"movl 16(%ebp),%esi\n\t"
"movl %esp,%edi\n\t"
"cld\n\t"
"rep; movsl\n"
"1:\tcall *8(%ebp)\n\t"
"leal -8(%ebp),%esp\n\t"
"popl %edi\n\t"
__ASM_CFI(".cfi_same_value %edi\n\t")
"popl %esi\n\t"
__ASM_CFI(".cfi_same_value %esi\n\t")
"popl %ebp\n\t"
__ASM_CFI(".cfi_def_cfa %esp,4\n\t")
__ASM_CFI(".cfi_same_value %ebp\n\t")
"ret" )
/***********************************************************************
* relay_call_from_16_no_debug
*
* Same as relay_call_from_16 but doesn't print any debug information.
*/
static int relay_call_from_16_no_debug( void *entry_point, unsigned char *args16, CONTEXT *context,
const CALLFROM16 *call )
{
unsigned int i, j, nb_args = 0;
int args32[20];
/* look for the ret instruction */
for (j = 0; j < ARRAY_SIZE(call->ret); j++)
if (call->ret[j] == 0xca66 || call->ret[j] == 0xcb66) break;
if (call->ret[j] == 0xcb66) /* cdecl */
{
for (i = 0; i < 20; i++, nb_args++)
{
int type = (call->arg_types[i / 10] >> (3 * (i % 10))) & 7;
if (type == ARG_NONE) break;
switch(type)
{
case ARG_WORD:
args32[nb_args] = *(WORD *)args16;
args16 += sizeof(WORD);
break;
case ARG_SWORD:
args32[nb_args] = *(short *)args16;
args16 += sizeof(WORD);
break;
case ARG_LONG:
case ARG_SEGSTR:
args32[nb_args] = *(int *)args16;
args16 += sizeof(int);
break;
case ARG_PTR:
case ARG_STR:
args32[nb_args] = (int)MapSL( *(SEGPTR *)args16 );
args16 += sizeof(SEGPTR);
break;
case ARG_VARARG:
args32[nb_args] = (int)args16;
break;
default:
break;
}
}
}
else /* not cdecl */
{
/* Start with the last arg */
args16 += call->ret[j + 1];
for (i = 0; i < 20; i++, nb_args++)
{
int type = (call->arg_types[i / 10] >> (3 * (i % 10))) & 7;
if (type == ARG_NONE) break;
switch(type)
{
case ARG_WORD:
args16 -= sizeof(WORD);
args32[nb_args] = *(WORD *)args16;
break;
case ARG_SWORD:
args16 -= sizeof(WORD);
args32[nb_args] = *(short *)args16;
break;
case ARG_LONG:
case ARG_SEGSTR:
args16 -= sizeof(int);
args32[nb_args] = *(int *)args16;
break;
case ARG_PTR:
case ARG_STR:
args16 -= sizeof(SEGPTR);
args32[nb_args] = (int)MapSL( *(SEGPTR *)args16 );
break;
default:
break;
}
}
}
if (!j) /* register function */
args32[nb_args++] = (int)context;
SYSLEVEL_CheckNotLevel( 2 );
return call_entry_point( entry_point, nb_args, args32 );
}
/***********************************************************************
* relay_call_from_16
*
* Replacement for the 16-bit relay functions when relay debugging is on.
*/
int relay_call_from_16( void *entry_point, unsigned char *args16, CONTEXT *context )
{
STACK16FRAME *frame;
WORD ordinal;
unsigned int i, j, nb_args = 0;
int ret_val, args32[20];
char module[10], func[64];
const CALLFROM16 *call;
frame = CURRENT_STACK16;
call = get_entry_point( frame, module, func, &ordinal );
if (!TRACE_ON(relay) || !RELAY_ShowDebugmsgRelay( module, ordinal, func ))
return relay_call_from_16_no_debug( entry_point, args16, context, call );
TRACE( "\1Call %s.%d: %s(", module, ordinal, func );
/* look for the ret instruction */
for (j = 0; j < ARRAY_SIZE(call->ret); j++)
if (call->ret[j] == 0xca66 || call->ret[j] == 0xcb66) break;
if (call->ret[j] == 0xcb66) /* cdecl */
{
for (i = 0; i < 20; i++, nb_args++)
{
int type = (call->arg_types[i / 10] >> (3 * (i % 10))) & 7;
if (type == ARG_NONE) break;
if (i) TRACE( "," );
switch(type)
{
case ARG_WORD:
TRACE( "%04x", *(WORD *)args16 );
args32[nb_args] = *(WORD *)args16;
args16 += sizeof(WORD);
break;
case ARG_SWORD:
TRACE( "%04x", *(WORD *)args16 );
args32[nb_args] = *(short *)args16;
args16 += sizeof(WORD);
break;
case ARG_LONG:
TRACE( "%08x", *(int *)args16 );
args32[nb_args] = *(int *)args16;
args16 += sizeof(int);
break;
case ARG_PTR:
TRACE( "%04x:%04x", *(WORD *)(args16+2), *(WORD *)args16 );
args32[nb_args] = (int)MapSL( *(SEGPTR *)args16 );
args16 += sizeof(SEGPTR);
break;
case ARG_STR:
TRACE( "%08x %s", *(int *)args16, debugstr_a( MapSL(*(SEGPTR *)args16 )));
args32[nb_args] = (int)MapSL( *(SEGPTR *)args16 );
args16 += sizeof(int);
break;
case ARG_SEGSTR:
TRACE( "%04x:%04x %s", *(WORD *)(args16+2), *(WORD *)args16,
debugstr_a( MapSL(*(SEGPTR *)args16 )) );
args32[nb_args] = *(SEGPTR *)args16;
args16 += sizeof(SEGPTR);
break;
case ARG_VARARG:
TRACE( "..." );
args32[nb_args] = (int)args16;
break;
default:
break;
}
}
}
else /* not cdecl */
{
/* Start with the last arg */
args16 += call->ret[j + 1];
for (i = 0; i < 20; i++, nb_args++)
{
int type = (call->arg_types[i / 10] >> (3 * (i % 10))) & 7;
if (type == ARG_NONE) break;
if (i) TRACE( "," );
switch(type)
{
case ARG_WORD:
args16 -= sizeof(WORD);
args32[nb_args] = *(WORD *)args16;
TRACE( "%04x", *(WORD *)args16 );
break;
case ARG_SWORD:
args16 -= sizeof(WORD);
args32[nb_args] = *(short *)args16;
TRACE( "%04x", *(WORD *)args16 );
break;
case ARG_LONG:
args16 -= sizeof(int);
args32[nb_args] = *(int *)args16;
TRACE( "%08x", *(int *)args16 );
break;
case ARG_PTR:
args16 -= sizeof(SEGPTR);
args32[nb_args] = (int)MapSL( *(SEGPTR *)args16 );
TRACE( "%04x:%04x", *(WORD *)(args16+2), *(WORD *)args16 );
break;
case ARG_STR:
args16 -= sizeof(int);
args32[nb_args] = (int)MapSL( *(SEGPTR *)args16 );
TRACE( "%08x %s", *(int *)args16, debugstr_a( MapSL(*(SEGPTR *)args16 )));
break;
case ARG_SEGSTR:
args16 -= sizeof(SEGPTR);
args32[nb_args] = *(SEGPTR *)args16;
TRACE( "%04x:%04x %s", *(WORD *)(args16+2), *(WORD *)args16,
debugstr_a( MapSL(*(SEGPTR *)args16 )) );
break;
case ARG_VARARG:
TRACE( "..." );
args32[nb_args] = (int)args16;
break;
default:
break;
}
}
}
if (!j) /* register function */
{
args32[nb_args++] = (int)context;
TRACE( ") ret=%04x:%04x ax=%04x bx=%04x cx=%04x dx=%04x si=%04x di=%04x ds=%04x es=%04x efl=%08x\n",
frame->cs, frame->ip, (WORD)context->Eax, (WORD)context->Ebx, (WORD)context->Ecx,
(WORD)context->Edx, (WORD)context->Esi, (WORD)context->Edi, (WORD)context->SegDs,
(WORD)context->SegEs, context->EFlags );
}
else TRACE( ") ret=%04x:%04x ds=%04x\n", frame->cs, frame->ip, frame->ds );
SYSLEVEL_CheckNotLevel( 2 );
ret_val = call_entry_point( entry_point, nb_args, args32 );
SYSLEVEL_CheckNotLevel( 2 );
TRACE( "\1Ret %s.%d: %s() ", module, ordinal, func );
if (!j) /* register function */
{
TRACE( "retval=none ret=%04x:%04x ax=%04x bx=%04x cx=%04x dx=%04x si=%04x di=%04x ds=%04x es=%04x efl=%08x\n",
(WORD)context->SegCs, LOWORD(context->Eip), (WORD)context->Eax, (WORD)context->Ebx,
(WORD)context->Ecx, (WORD)context->Edx, (WORD)context->Esi, (WORD)context->Edi,
(WORD)context->SegDs, (WORD)context->SegEs, context->EFlags );
}
else
{
frame = CURRENT_STACK16; /* might have be changed by the entry point */
if (j == 1) /* 16-bit return sequence */
TRACE( "retval=%04x ret=%04x:%04x ds=%04x\n",
ret_val & 0xffff, frame->cs, frame->ip, frame->ds );
else
TRACE( "retval=%08x ret=%04x:%04x ds=%04x\n",
ret_val, frame->cs, frame->ip, frame->ds );
}
return ret_val;
}
/**********************************************************************
* 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(relay_data_sel, offset));
}
/**********************************************************************
* RELAY_MakeShortContext
*
* Allocate separate 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( CONTEXT *context )
{
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 = relay_data_sel;
context->Esp = offset;
context->SegCs = 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, CONTEXT *context )
{
if (proc)
{
RELAY_Stack16 *stack = RELAY_GetPointer( context->Esp );
DWORD old_seg_cs = context->SegCs;
DWORD old_eip = context->Eip;
DWORD old_seg_ss = context->SegSs;
DWORD old_esp = context->Esp;
context->SegCs = stack->seg_cs;
context->Eip = stack->eip;
context->SegSs = stack->seg_ss;
context->Esp = stack->esp;
proc( context, *(LPVOID *)args );
stack->seg_cs = context->SegCs;
stack->eip = context->Eip;
stack->seg_ss = context->SegSs;
stack->esp = context->Esp;
context->SegCs = old_seg_cs;
context->Eip = old_eip;
context->SegSs = old_seg_ss;
context->Esp = old_esp;
}
}
/**********************************************************************
* DOSVM_RelayHandler
*
* Restore saved code and stack pointers and release stack block.
*/
void DOSVM_RelayHandler( CONTEXT *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_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( CONTEXT *context, DOSRELAY relay, LPVOID data )
{
WORD code_sel = relay_code_sel;
/*
* Allocate separate stack for relay call.
*/
RELAY_MakeShortContext( context );
/*
* Build call frame.
*/
PUSH_WORD16( context, HIWORD(data) ); /* argument.hiword */
PUSH_WORD16( context, LOWORD(data) ); /* argument.loword */
PUSH_WORD16( context, context->SegCs ); /* STACK16FRAME.cs */
PUSH_WORD16( context, LOWORD(context->Eip) ); /* STACK16FRAME.ip */
PUSH_WORD16( context, LOWORD(context->Ebp) ); /* STACK16FRAME.bp */
PUSH_WORD16( context, HIWORD(relay) ); /* STACK16FRAME.entry_point.hiword */
PUSH_WORD16( context, LOWORD(relay) ); /* STACK16FRAME.entry_point.loword */
PUSH_WORD16( context, 0 ); /* STACK16FRAME.entry_ip */
PUSH_WORD16( context, HIWORD(RELAY_RelayStub) ); /* STACK16FRAME.relay.hiword */
PUSH_WORD16( context, LOWORD(RELAY_RelayStub) ); /* STACK16FRAME.relay.loword */
PUSH_WORD16( context, 0 ); /* STACK16FRAME.module_cs.hiword */
PUSH_WORD16( context, code_sel ); /* STACK16FRAME.module_cs.loword */
PUSH_WORD16( context, 0 ); /* STACK16FRAME.callfrom_ip.hiword */
PUSH_WORD16( context, 0 ); /* STACK16FRAME.callfrom_ip.loword */
/*
* Adjust code pointer.
*/
context->SegCs = get_cs();
context->Eip = (DWORD)__wine_call_from_16_regs;
}
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