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751 lines
25 KiB
C
751 lines
25 KiB
C
/*
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* Copyright 1993 Robert J. Amstadt
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* Copyright 1995 Alexandre Julliard
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* Copyright 2002 Jukka Heinonen
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
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*/
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#include "config.h"
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#include "wine/port.h"
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#include <assert.h>
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#include <stdlib.h>
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#include <string.h>
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#include <stdarg.h>
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#include <stdio.h>
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#include "windef.h"
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#include "winbase.h"
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#include "wine/winbase16.h"
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#include "winternl.h"
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#include "kernel16_private.h"
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#include "dosexe.h"
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#include "wine/unicode.h"
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#include "wine/library.h"
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#include "wine/debug.h"
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WINE_DEFAULT_DEBUG_CHANNEL(relay);
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/*
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* Magic DWORD used to check stack integrity.
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*/
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#define RELAY_MAGIC 0xabcdef00
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/*
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* Memory block for temporary 16-bit stacks used with relay calls.
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*/
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typedef struct {
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DWORD inuse; /* non-zero if stack block is in use */
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DWORD eip; /* saved ip */
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DWORD seg_cs; /* saved cs */
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DWORD esp; /* saved sp */
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DWORD seg_ss; /* saved ss */
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DWORD stack_bottom; /* guard dword */
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BYTE stack[256-7*4]; /* 16-bit stack */
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DWORD stack_top; /* guard dword */
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} RELAY_Stack16;
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static const WCHAR **debug_relay_excludelist;
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static const WCHAR **debug_relay_includelist;
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static const WCHAR **debug_snoop_excludelist;
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static const WCHAR **debug_snoop_includelist;
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/* compare an ASCII and a Unicode string without depending on the current codepage */
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static inline int strcmpiAW( const char *strA, const WCHAR *strW )
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{
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while (*strA && (toupperW((unsigned char)*strA) == toupperW(*strW))) { strA++; strW++; }
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return toupperW((unsigned char)*strA) - toupperW(*strW);
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}
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/* compare an ASCII and a Unicode string without depending on the current codepage */
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static inline int strncmpiAW( const char *strA, const WCHAR *strW, int n )
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{
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int ret = 0;
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for ( ; n > 0; n--, strA++, strW++)
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if ((ret = toupperW((unsigned char)*strA) - toupperW(*strW)) || !*strA) break;
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return ret;
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}
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/***********************************************************************
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* build_list
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*
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* Build a function list from a ';'-separated string.
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*/
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static const WCHAR **build_list( const WCHAR *buffer )
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{
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int count = 1;
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const WCHAR *p = buffer;
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const WCHAR **ret;
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while ((p = strchrW( p, ';' )))
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{
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count++;
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p++;
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}
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/* allocate count+1 pointers, plus the space for a copy of the string */
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if ((ret = RtlAllocateHeap( GetProcessHeap(), 0,
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(count+1) * sizeof(WCHAR*) + (strlenW(buffer)+1) * sizeof(WCHAR) )))
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{
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WCHAR *str = (WCHAR *)(ret + count + 1);
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WCHAR *p = str;
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strcpyW( str, buffer );
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count = 0;
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for (;;)
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{
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ret[count++] = p;
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if (!(p = strchrW( p, ';' ))) break;
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*p++ = 0;
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}
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ret[count++] = NULL;
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}
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return ret;
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}
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/***********************************************************************
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* RELAY16_InitDebugLists
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*
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* Build the relay include/exclude function lists.
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*/
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void RELAY16_InitDebugLists(void)
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{
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OBJECT_ATTRIBUTES attr;
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UNICODE_STRING name;
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char buffer[1024];
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HANDLE root, hkey;
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DWORD count;
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WCHAR *str;
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static const WCHAR configW[] = {'S','o','f','t','w','a','r','e','\\',
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'W','i','n','e','\\',
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'D','e','b','u','g',0};
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static const WCHAR RelayIncludeW[] = {'R','e','l','a','y','I','n','c','l','u','d','e',0};
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static const WCHAR RelayExcludeW[] = {'R','e','l','a','y','E','x','c','l','u','d','e',0};
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static const WCHAR SnoopIncludeW[] = {'S','n','o','o','p','I','n','c','l','u','d','e',0};
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static const WCHAR SnoopExcludeW[] = {'S','n','o','o','p','E','x','c','l','u','d','e',0};
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RtlOpenCurrentUser( KEY_READ, &root );
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attr.Length = sizeof(attr);
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attr.RootDirectory = root;
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attr.ObjectName = &name;
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attr.Attributes = 0;
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attr.SecurityDescriptor = NULL;
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attr.SecurityQualityOfService = NULL;
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RtlInitUnicodeString( &name, configW );
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/* @@ Wine registry key: HKCU\Software\Wine\Debug */
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if (NtOpenKey( &hkey, KEY_READ, &attr )) hkey = 0;
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NtClose( root );
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if (!hkey) return;
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str = (WCHAR *)((KEY_VALUE_PARTIAL_INFORMATION *)buffer)->Data;
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RtlInitUnicodeString( &name, RelayIncludeW );
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if (!NtQueryValueKey( hkey, &name, KeyValuePartialInformation, buffer, sizeof(buffer), &count ))
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{
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debug_relay_includelist = build_list( str );
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}
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RtlInitUnicodeString( &name, RelayExcludeW );
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if (!NtQueryValueKey( hkey, &name, KeyValuePartialInformation, buffer, sizeof(buffer), &count ))
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{
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debug_relay_excludelist = build_list( str );
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}
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RtlInitUnicodeString( &name, SnoopIncludeW );
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if (!NtQueryValueKey( hkey, &name, KeyValuePartialInformation, buffer, sizeof(buffer), &count ))
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{
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debug_snoop_includelist = build_list( str );
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}
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RtlInitUnicodeString( &name, SnoopExcludeW );
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if (!NtQueryValueKey( hkey, &name, KeyValuePartialInformation, buffer, sizeof(buffer), &count ))
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{
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debug_snoop_excludelist = build_list( str );
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}
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NtClose( hkey );
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}
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/***********************************************************************
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* check_list
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*
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* Check if a given module and function is in the list.
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*/
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static BOOL check_list( const char *module, int ordinal, const char *func, const WCHAR **list )
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{
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char ord_str[10];
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sprintf( ord_str, "%d", ordinal );
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for(; *list; list++)
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{
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const WCHAR *p = strrchrW( *list, '.' );
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if (p && p > *list) /* check module and function */
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{
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int len = p - *list;
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if (strncmpiAW( module, *list, len-1 ) || module[len]) continue;
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if (p[1] == '*' && !p[2]) return TRUE;
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if (!strcmpiAW( ord_str, p + 1 )) return TRUE;
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if (func && !strcmpiAW( func, p + 1 )) return TRUE;
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}
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else /* function only */
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{
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if (func && !strcmpiAW( func, *list )) return TRUE;
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}
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}
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return FALSE;
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}
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/***********************************************************************
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* RELAY_ShowDebugmsgRelay
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*
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* Simple function to decide if a particular debugging message is
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* wanted.
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*/
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static BOOL RELAY_ShowDebugmsgRelay(const char *module, int ordinal, const char *func)
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{
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if (debug_relay_excludelist && check_list( module, ordinal, func, debug_relay_excludelist ))
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return FALSE;
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if (debug_relay_includelist && !check_list( module, ordinal, func, debug_relay_includelist ))
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return FALSE;
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return TRUE;
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}
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/***********************************************************************
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* SNOOP16_ShowDebugmsgSnoop
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*
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* Simple function to decide if a particular debugging message is
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* wanted.
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*/
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BOOL SNOOP16_ShowDebugmsgSnoop(const char *module, int ordinal, const char *func)
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{
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if (debug_snoop_excludelist && check_list( module, ordinal, func, debug_snoop_excludelist ))
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return FALSE;
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if (debug_snoop_includelist && !check_list( module, ordinal, func, debug_snoop_includelist ))
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return FALSE;
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return TRUE;
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}
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/***********************************************************************
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* get_entry_point
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*
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* Return the ordinal, name, and type info corresponding to a CS:IP address.
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*/
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static const CALLFROM16 *get_entry_point( STACK16FRAME *frame, LPSTR module, LPSTR func, WORD *pOrd )
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{
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WORD i, max_offset;
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register BYTE *p;
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NE_MODULE *pModule;
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ET_BUNDLE *bundle;
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ET_ENTRY *entry;
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*pOrd = 0;
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if (!(pModule = NE_GetPtr( FarGetOwner16( GlobalHandle16( frame->module_cs ) ))))
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return NULL;
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max_offset = 0;
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bundle = (ET_BUNDLE *)((BYTE *)pModule + pModule->ne_enttab);
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do
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{
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entry = (ET_ENTRY *)((BYTE *)bundle+6);
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for (i = bundle->first + 1; i <= bundle->last; i++)
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{
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if ((entry->offs < frame->entry_ip)
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&& (entry->segnum == 1) /* code segment ? */
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&& (entry->offs >= max_offset))
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{
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max_offset = entry->offs;
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*pOrd = i;
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}
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entry++;
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}
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} while ( (bundle->next)
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&& (bundle = (ET_BUNDLE *)((BYTE *)pModule+bundle->next)));
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/* Search for the name in the resident names table */
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/* (built-in modules have no non-resident table) */
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p = (BYTE *)pModule + pModule->ne_restab;
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memcpy( module, p + 1, *p );
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module[*p] = 0;
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while (*p)
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{
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p += *p + 1 + sizeof(WORD);
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if (*(WORD *)(p + *p + 1) == *pOrd) break;
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}
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memcpy( func, p + 1, *p );
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func[*p] = 0;
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/* Retrieve entry point call structure */
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p = MapSL( MAKESEGPTR( frame->module_cs, frame->callfrom_ip ) );
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/* p now points to lret, get the start of CALLFROM16 structure */
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return (CALLFROM16 *)(p - FIELD_OFFSET( CALLFROM16, ret ));
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}
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extern int call_entry_point( void *func, int nb_args, const int *args );
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__ASM_GLOBAL_FUNC( call_entry_point,
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"pushl %ebp\n\t"
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__ASM_CFI(".cfi_adjust_cfa_offset 4\n\t")
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__ASM_CFI(".cfi_rel_offset %ebp,0\n\t")
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"movl %esp,%ebp\n\t"
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__ASM_CFI(".cfi_def_cfa_register %ebp\n\t")
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"pushl %esi\n\t"
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__ASM_CFI(".cfi_rel_offset %esi,-4\n\t")
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"pushl %edi\n\t"
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__ASM_CFI(".cfi_rel_offset %edi,-8\n\t")
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"movl 12(%ebp),%edx\n\t"
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"shll $2,%edx\n\t"
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"jz 1f\n\t"
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"subl %edx,%esp\n\t"
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"andl $~15,%esp\n\t"
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"movl 12(%ebp),%ecx\n\t"
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"movl 16(%ebp),%esi\n\t"
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"movl %esp,%edi\n\t"
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"cld\n\t"
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"rep; movsl\n"
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"1:\tcall *8(%ebp)\n\t"
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"leal -8(%ebp),%esp\n\t"
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"popl %edi\n\t"
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__ASM_CFI(".cfi_same_value %edi\n\t")
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"popl %esi\n\t"
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__ASM_CFI(".cfi_same_value %esi\n\t")
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"popl %ebp\n\t"
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__ASM_CFI(".cfi_def_cfa %esp,4\n\t")
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__ASM_CFI(".cfi_same_value %ebp\n\t")
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"ret" )
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/***********************************************************************
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* relay_call_from_16_no_debug
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*
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* Same as relay_call_from_16 but doesn't print any debug information.
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*/
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static int relay_call_from_16_no_debug( void *entry_point, unsigned char *args16, CONTEXT *context,
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const CALLFROM16 *call )
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{
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unsigned int i, j, nb_args = 0;
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int args32[20];
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/* look for the ret instruction */
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for (j = 0; j < sizeof(call->ret)/sizeof(call->ret[0]); j++)
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if (call->ret[j] == 0xca66 || call->ret[j] == 0xcb66) break;
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if (call->ret[j] == 0xcb66) /* cdecl */
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{
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for (i = 0; i < 20; i++, nb_args++)
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{
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int type = (call->arg_types[i / 10] >> (3 * (i % 10))) & 7;
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if (type == ARG_NONE) break;
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switch(type)
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{
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case ARG_WORD:
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args32[nb_args] = *(WORD *)args16;
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args16 += sizeof(WORD);
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break;
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case ARG_SWORD:
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args32[nb_args] = *(short *)args16;
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args16 += sizeof(WORD);
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break;
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case ARG_LONG:
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case ARG_SEGSTR:
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args32[nb_args] = *(int *)args16;
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args16 += sizeof(int);
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break;
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case ARG_PTR:
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case ARG_STR:
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args32[nb_args] = (int)MapSL( *(SEGPTR *)args16 );
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args16 += sizeof(SEGPTR);
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break;
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case ARG_VARARG:
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args32[nb_args] = (int)args16;
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break;
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default:
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break;
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}
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}
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}
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else /* not cdecl */
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{
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/* Start with the last arg */
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args16 += call->ret[j + 1];
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for (i = 0; i < 20; i++, nb_args++)
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{
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int type = (call->arg_types[i / 10] >> (3 * (i % 10))) & 7;
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if (type == ARG_NONE) break;
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switch(type)
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{
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case ARG_WORD:
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args16 -= sizeof(WORD);
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args32[nb_args] = *(WORD *)args16;
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break;
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case ARG_SWORD:
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args16 -= sizeof(WORD);
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args32[nb_args] = *(short *)args16;
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break;
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case ARG_LONG:
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case ARG_SEGSTR:
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args16 -= sizeof(int);
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args32[nb_args] = *(int *)args16;
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break;
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case ARG_PTR:
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case ARG_STR:
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args16 -= sizeof(SEGPTR);
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args32[nb_args] = (int)MapSL( *(SEGPTR *)args16 );
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break;
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default:
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break;
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}
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}
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}
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if (!j) /* register function */
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args32[nb_args++] = (int)context;
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SYSLEVEL_CheckNotLevel( 2 );
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return call_entry_point( entry_point, nb_args, args32 );
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}
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/***********************************************************************
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* relay_call_from_16
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*
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* Replacement for the 16-bit relay functions when relay debugging is on.
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*/
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int relay_call_from_16( void *entry_point, unsigned char *args16, CONTEXT *context )
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{
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STACK16FRAME *frame;
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WORD ordinal;
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unsigned int i, j, nb_args = 0;
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int ret_val, args32[20];
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char module[10], func[64];
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const CALLFROM16 *call;
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frame = CURRENT_STACK16;
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call = get_entry_point( frame, module, func, &ordinal );
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if (!TRACE_ON(relay) || !RELAY_ShowDebugmsgRelay( module, ordinal, func ))
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return relay_call_from_16_no_debug( entry_point, args16, context, call );
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DPRINTF( "%04x:Call %s.%d: %s(",GetCurrentThreadId(), module, ordinal, func );
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/* look for the ret instruction */
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for (j = 0; j < sizeof(call->ret)/sizeof(call->ret[0]); j++)
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if (call->ret[j] == 0xca66 || call->ret[j] == 0xcb66) break;
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if (call->ret[j] == 0xcb66) /* cdecl */
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{
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for (i = 0; i < 20; i++, nb_args++)
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{
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int type = (call->arg_types[i / 10] >> (3 * (i % 10))) & 7;
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if (type == ARG_NONE) break;
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if (i) DPRINTF( "," );
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switch(type)
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{
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case ARG_WORD:
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DPRINTF( "%04x", *(WORD *)args16 );
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args32[nb_args] = *(WORD *)args16;
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args16 += sizeof(WORD);
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break;
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case ARG_SWORD:
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DPRINTF( "%04x", *(WORD *)args16 );
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args32[nb_args] = *(short *)args16;
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args16 += sizeof(WORD);
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break;
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case ARG_LONG:
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DPRINTF( "%08x", *(int *)args16 );
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args32[nb_args] = *(int *)args16;
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args16 += sizeof(int);
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break;
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case ARG_PTR:
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DPRINTF( "%04x:%04x", *(WORD *)(args16+2), *(WORD *)args16 );
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args32[nb_args] = (int)MapSL( *(SEGPTR *)args16 );
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args16 += sizeof(SEGPTR);
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break;
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case ARG_STR:
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DPRINTF( "%08x %s", *(int *)args16,
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debugstr_a( MapSL(*(SEGPTR *)args16 )));
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args32[nb_args] = (int)MapSL( *(SEGPTR *)args16 );
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|
args16 += sizeof(int);
|
|
break;
|
|
case ARG_SEGSTR:
|
|
DPRINTF( "%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:
|
|
DPRINTF( "..." );
|
|
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) DPRINTF( "," );
|
|
switch(type)
|
|
{
|
|
case ARG_WORD:
|
|
args16 -= sizeof(WORD);
|
|
args32[nb_args] = *(WORD *)args16;
|
|
DPRINTF( "%04x", *(WORD *)args16 );
|
|
break;
|
|
case ARG_SWORD:
|
|
args16 -= sizeof(WORD);
|
|
args32[nb_args] = *(short *)args16;
|
|
DPRINTF( "%04x", *(WORD *)args16 );
|
|
break;
|
|
case ARG_LONG:
|
|
args16 -= sizeof(int);
|
|
args32[nb_args] = *(int *)args16;
|
|
DPRINTF( "%08x", *(int *)args16 );
|
|
break;
|
|
case ARG_PTR:
|
|
args16 -= sizeof(SEGPTR);
|
|
args32[nb_args] = (int)MapSL( *(SEGPTR *)args16 );
|
|
DPRINTF( "%04x:%04x", *(WORD *)(args16+2), *(WORD *)args16 );
|
|
break;
|
|
case ARG_STR:
|
|
args16 -= sizeof(int);
|
|
args32[nb_args] = (int)MapSL( *(SEGPTR *)args16 );
|
|
DPRINTF( "%08x %s", *(int *)args16,
|
|
debugstr_a( MapSL(*(SEGPTR *)args16 )));
|
|
break;
|
|
case ARG_SEGSTR:
|
|
args16 -= sizeof(SEGPTR);
|
|
args32[nb_args] = *(SEGPTR *)args16;
|
|
DPRINTF( "%04x:%04x %s", *(WORD *)(args16+2), *(WORD *)args16,
|
|
debugstr_a( MapSL(*(SEGPTR *)args16 )) );
|
|
break;
|
|
case ARG_VARARG:
|
|
DPRINTF( "..." );
|
|
args32[nb_args] = (int)args16;
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
DPRINTF( ") ret=%04x:%04x ds=%04x\n", frame->cs, frame->ip, frame->ds );
|
|
|
|
if (!j) /* register function */
|
|
{
|
|
args32[nb_args++] = (int)context;
|
|
DPRINTF(" AX=%04x BX=%04x CX=%04x DX=%04x SI=%04x DI=%04x ES=%04x EFL=%08x\n",
|
|
(WORD)context->Eax, (WORD)context->Ebx, (WORD)context->Ecx,
|
|
(WORD)context->Edx, (WORD)context->Esi, (WORD)context->Edi,
|
|
(WORD)context->SegEs, context->EFlags );
|
|
}
|
|
|
|
SYSLEVEL_CheckNotLevel( 2 );
|
|
|
|
ret_val = call_entry_point( entry_point, nb_args, args32 );
|
|
|
|
SYSLEVEL_CheckNotLevel( 2 );
|
|
|
|
DPRINTF( "%04x:Ret %s.%d: %s() ",GetCurrentThreadId(), module, ordinal, func );
|
|
if (!j) /* register function */
|
|
{
|
|
DPRINTF("retval=none ret=%04x:%04x ds=%04x\n",
|
|
(WORD)context->SegCs, LOWORD(context->Eip), (WORD)context->SegDs);
|
|
DPRINTF(" AX=%04x BX=%04x CX=%04x DX=%04x SI=%04x DI=%04x ES=%04x EFL=%08x\n",
|
|
(WORD)context->Eax, (WORD)context->Ebx, (WORD)context->Ecx,
|
|
(WORD)context->Edx, (WORD)context->Esi, (WORD)context->Edi,
|
|
(WORD)context->SegEs, context->EFlags );
|
|
}
|
|
else
|
|
{
|
|
frame = CURRENT_STACK16; /* might have be changed by the entry point */
|
|
if (j == 1) /* 16-bit return sequence */
|
|
DPRINTF( "retval=%04x ret=%04x:%04x ds=%04x\n",
|
|
ret_val & 0xffff, frame->cs, frame->ip, frame->ds );
|
|
else
|
|
DPRINTF( "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(DOSVM_dpmi_segments->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 = DOSVM_dpmi_segments->relay_data_sel;
|
|
context->Esp = offset;
|
|
context->SegCs = DOSVM_dpmi_segments->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 = DOSVM_dpmi_segments->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 = wine_get_cs();
|
|
context->Eip = (DWORD)__wine_call_from_16_regs;
|
|
}
|