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wine/dlls/ntdll/relay.c
Alexandre Julliard 8e21562903 Added small assembly wrapper to call entry points without having to 
worry about their calling convention.
2005-07-22 19:50:13 +00:00

1045 lines
33 KiB
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/*
* Win32 relay and snoop functions
*
* Copyright 1997 Alexandre Julliard
* Copyright 1998 Marcus Meissner
*
* 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "config.h"
#include "wine/port.h"
#include <assert.h>
#include <string.h>
#include <stdarg.h>
#include <stdio.h>
#include "windef.h"
#include "winternl.h"
#include "excpt.h"
#include "wine/exception.h"
#include "ntdll_misc.h"
#include "wine/unicode.h"
#include "wine/debug.h"
WINE_DEFAULT_DEBUG_CHANNEL(relay);
WINE_DECLARE_DEBUG_CHANNEL(snoop);
WINE_DECLARE_DEBUG_CHANNEL(seh);
#ifdef __i386__
static const WCHAR **debug_relay_excludelist;
static const WCHAR **debug_relay_includelist;
static const WCHAR **debug_snoop_excludelist;
static const WCHAR **debug_snoop_includelist;
static const WCHAR **debug_from_relay_excludelist;
static const WCHAR **debug_from_relay_includelist;
static const WCHAR **debug_from_snoop_excludelist;
static const WCHAR **debug_from_snoop_includelist;
static BOOL init_done;
/* compare an ASCII and a Unicode string without depending on the current codepage */
inline static int strcmpAW( const char *strA, const WCHAR *strW )
{
while (*strA && ((unsigned char)*strA == *strW)) { strA++; strW++; }
return (unsigned char)*strA - *strW;
}
/* compare an ASCII and a Unicode string without depending on the current codepage */
inline static int strncmpiAW( const char *strA, const WCHAR *strW, int n )
{
int ret = 0;
for ( ; n > 0; n--, strA++, strW++)
if ((ret = toupperW((unsigned char)*strA) - toupperW(*strW)) || !*strA) break;
return ret;
}
/***********************************************************************
* build_list
*
* Build a function list from a ';'-separated string.
*/
static const WCHAR **build_list( const WCHAR *buffer )
{
int count = 1;
const WCHAR *p = buffer;
const WCHAR **ret;
while ((p = strchrW( p, ';' )))
{
count++;
p++;
}
/* allocate count+1 pointers, plus the space for a copy of the string */
if ((ret = RtlAllocateHeap( GetProcessHeap(), 0,
(count+1) * sizeof(WCHAR*) + (strlenW(buffer)+1) * sizeof(WCHAR) )))
{
WCHAR *str = (WCHAR *)(ret + count + 1);
WCHAR *p = str;
strcpyW( str, buffer );
count = 0;
for (;;)
{
ret[count++] = p;
if (!(p = strchrW( p, ';' ))) break;
*p++ = 0;
}
ret[count++] = NULL;
}
return ret;
}
/***********************************************************************
* init_debug_lists
*
* Build the relay include/exclude function lists.
*/
static void init_debug_lists(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};
static const WCHAR RelayFromIncludeW[] = {'R','e','l','a','y','F','r','o','m','I','n','c','l','u','d','e',0};
static const WCHAR RelayFromExcludeW[] = {'R','e','l','a','y','F','r','o','m','E','x','c','l','u','d','e',0};
static const WCHAR SnoopFromIncludeW[] = {'S','n','o','o','p','F','r','o','m','I','n','c','l','u','d','e',0};
static const WCHAR SnoopFromExcludeW[] = {'S','n','o','o','p','F','r','o','m','E','x','c','l','u','d','e',0};
if (init_done) return;
init_done = TRUE;
RtlOpenCurrentUser( KEY_ALL_ACCESS, &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_ALL_ACCESS, &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 ))
{
TRACE("RelayInclude = %s\n", debugstr_w(str) );
debug_relay_includelist = build_list( str );
}
RtlInitUnicodeString( &name, RelayExcludeW );
if (!NtQueryValueKey( hkey, &name, KeyValuePartialInformation, buffer, sizeof(buffer), &count ))
{
TRACE( "RelayExclude = %s\n", debugstr_w(str) );
debug_relay_excludelist = build_list( str );
}
RtlInitUnicodeString( &name, SnoopIncludeW );
if (!NtQueryValueKey( hkey, &name, KeyValuePartialInformation, buffer, sizeof(buffer), &count ))
{
TRACE_(snoop)( "SnoopInclude = %s\n", debugstr_w(str) );
debug_snoop_includelist = build_list( str );
}
RtlInitUnicodeString( &name, SnoopExcludeW );
if (!NtQueryValueKey( hkey, &name, KeyValuePartialInformation, buffer, sizeof(buffer), &count ))
{
TRACE_(snoop)( "SnoopExclude = %s\n", debugstr_w(str) );
debug_snoop_excludelist = build_list( str );
}
RtlInitUnicodeString( &name, RelayFromIncludeW );
if (!NtQueryValueKey( hkey, &name, KeyValuePartialInformation, buffer, sizeof(buffer), &count ))
{
TRACE("RelayFromInclude = %s\n", debugstr_w(str) );
debug_from_relay_includelist = build_list( str );
}
RtlInitUnicodeString( &name, RelayFromExcludeW );
if (!NtQueryValueKey( hkey, &name, KeyValuePartialInformation, buffer, sizeof(buffer), &count ))
{
TRACE( "RelayFromExclude = %s\n", debugstr_w(str) );
debug_from_relay_excludelist = build_list( str );
}
RtlInitUnicodeString( &name, SnoopFromIncludeW );
if (!NtQueryValueKey( hkey, &name, KeyValuePartialInformation, buffer, sizeof(buffer), &count ))
{
TRACE_(snoop)("SnoopFromInclude = %s\n", debugstr_w(str) );
debug_from_snoop_includelist = build_list( str );
}
RtlInitUnicodeString( &name, SnoopFromExcludeW );
if (!NtQueryValueKey( hkey, &name, KeyValuePartialInformation, buffer, sizeof(buffer), &count ))
{
TRACE_(snoop)( "SnoopFromExclude = %s\n", debugstr_w(str) );
debug_from_snoop_excludelist = build_list( str );
}
NtClose( hkey );
}
#include "pshpack1.h"
typedef struct
{
BYTE call; /* 0xe8 call callfrom32 (relative) */
DWORD callfrom32; /* RELAY_CallFrom32 relative addr */
BYTE ret; /* 0xc2 ret $n or 0xc3 ret */
WORD args; /* nb of args to remove from the stack */
void *orig; /* original entry point */
DWORD argtypes; /* argument types */
} DEBUG_ENTRY_POINT;
typedef struct
{
/* code part */
BYTE lcall; /* 0xe8 call snoopentry (relative) */
/* NOTE: If you move snoopentry OR nrofargs fix the relative offset
* calculation!
*/
DWORD snoopentry; /* SNOOP_Entry relative */
/* unreached */
int nrofargs;
FARPROC origfun;
const char *name;
} SNOOP_FUN;
typedef struct tagSNOOP_DLL {
HMODULE hmod;
SNOOP_FUN *funs;
DWORD ordbase;
DWORD nrofordinals;
struct tagSNOOP_DLL *next;
char name[1];
} SNOOP_DLL;
typedef struct
{
/* code part */
BYTE lcall; /* 0xe8 call snoopret relative*/
/* NOTE: If you move snoopret OR origreturn fix the relative offset
* calculation!
*/
DWORD snoopret; /* SNOOP_Ret relative */
/* unreached */
FARPROC origreturn;
SNOOP_DLL *dll;
DWORD ordinal;
DWORD origESP;
DWORD *args; /* saved args across a stdcall */
} SNOOP_RETURNENTRY;
typedef struct tagSNOOP_RETURNENTRIES {
SNOOP_RETURNENTRY entry[4092/sizeof(SNOOP_RETURNENTRY)];
struct tagSNOOP_RETURNENTRIES *next;
} SNOOP_RETURNENTRIES;
#include "poppack.h"
extern void WINAPI SNOOP_Entry();
extern void WINAPI SNOOP_Return();
static SNOOP_DLL *firstdll;
static SNOOP_RETURNENTRIES *firstrets;
static WINE_EXCEPTION_FILTER(page_fault)
{
if (GetExceptionCode() == EXCEPTION_ACCESS_VIOLATION ||
GetExceptionCode() == EXCEPTION_PRIV_INSTRUCTION)
return EXCEPTION_EXECUTE_HANDLER;
return EXCEPTION_CONTINUE_SEARCH;
}
/***********************************************************************
* 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 WCHAR **list )
{
char ord_str[10];
sprintf( ord_str, "%d", ordinal );
for(; *list; list++)
{
const WCHAR *p = strrchrW( *list, '.' );
if (p && p > *list) /* check module and function */
{
int len = p - *list;
if (strncmpiAW( module, *list, len-1 ) || module[len]) continue;
if (p[1] == '*' && !p[2]) return TRUE;
if (!strcmpAW( ord_str, p + 1 )) return TRUE;
if (func && !strcmpAW( func, p + 1 )) return TRUE;
}
else /* function only */
{
if (func && !strcmpAW( func, *list )) return TRUE;
}
}
return FALSE;
}
/***********************************************************************
* check_relay_include
*
* Check if a given function must be included in the relay output.
*/
static BOOL check_relay_include( 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;
}
/***********************************************************************
* check_from_module
*
* Check if calls from a given module must be included in the relay/snoop output,
* given the exclusion and inclusion lists.
*/
static BOOL check_from_module( const WCHAR **includelist, const WCHAR **excludelist, const WCHAR *module )
{
static const WCHAR dllW[] = {'.','d','l','l',0 };
const WCHAR **listitem;
BOOL show;
if (!module) return TRUE;
if (!includelist && !excludelist) return TRUE;
if (excludelist)
{
show = TRUE;
listitem = excludelist;
}
else
{
show = FALSE;
listitem = includelist;
}
for(; *listitem; listitem++)
{
int len;
if (!strcmpiW( *listitem, module )) return !show;
len = strlenW( *listitem );
if (!strncmpiW( *listitem, module, len ) && !strcmpiW( module + len, dllW ))
return !show;
}
return show;
}
/***********************************************************************
* find_exported_name
*
* Find the name of an exported function.
*/
static const char *find_exported_name( HMODULE module,
IMAGE_EXPORT_DIRECTORY *exp, int ordinal )
{
unsigned int i;
const char *ret = NULL;
WORD *ordptr = (WORD *)((char *)module + exp->AddressOfNameOrdinals);
for (i = 0; i < exp->NumberOfNames; i++, ordptr++)
if (*ordptr + exp->Base == ordinal) break;
if (i < exp->NumberOfNames)
ret = (char *)module + ((DWORD*)((char *)module + exp->AddressOfNames))[i];
return ret;
}
/***********************************************************************
* get_entry_point
*
* Get the name of the DLL entry point corresponding to a relay address.
*/
static void get_entry_point( char *buffer, DEBUG_ENTRY_POINT *relay )
{
IMAGE_EXPORT_DIRECTORY *exp = NULL;
DEBUG_ENTRY_POINT *debug;
char *p;
const char *name;
int ordinal = 0;
PLIST_ENTRY mark, entry;
PLDR_MODULE mod = NULL;
DWORD size;
/* First find the module */
mark = &NtCurrentTeb()->Peb->LdrData->InLoadOrderModuleList;
for (entry = mark->Flink; entry != mark; entry = entry->Flink)
{
mod = CONTAINING_RECORD(entry, LDR_MODULE, InLoadOrderModuleList);
if (!(mod->Flags & LDR_WINE_INTERNAL)) continue;
exp = RtlImageDirectoryEntryToData( mod->BaseAddress, TRUE, IMAGE_DIRECTORY_ENTRY_EXPORT, &size );
if (!exp) continue;
debug = (DEBUG_ENTRY_POINT *)((char *)exp + size);
if (debug <= relay && relay < debug + exp->NumberOfFunctions)
{
ordinal = relay - debug;
break;
}
}
/* Now find the function */
strcpy( buffer, (char *)mod->BaseAddress + exp->Name );
p = buffer + strlen(buffer);
if (p > buffer + 4 && !strcasecmp( p - 4, ".dll" )) p -= 4;
if ((name = find_exported_name( mod->BaseAddress, exp, ordinal + exp->Base )))
sprintf( p, ".%s", name );
else
sprintf( p, ".%ld", ordinal + exp->Base );
}
/***********************************************************************
* RELAY_PrintArgs
*/
static inline void RELAY_PrintArgs( int *args, int nb_args, unsigned int typemask )
{
while (nb_args--)
{
if ((typemask & 3) && HIWORD(*args))
{
if (typemask & 2)
DPRINTF( "%08x %s", *args, debugstr_w((LPWSTR)*args) );
else
DPRINTF( "%08x %s", *args, debugstr_a((LPCSTR)*args) );
}
else DPRINTF( "%08x", *args );
if (nb_args) DPRINTF( "," );
args++;
typemask >>= 2;
}
}
extern LONGLONG call_entry_point( void *func, int nb_args, const int *args );
__ASM_GLOBAL_FUNC( call_entry_point,
"\tpushl %ebp\n"
"\tmovl %esp,%ebp\n"
"\tmovl 12(%ebp),%ecx\n"
"\tmovl 16(%ebp),%edx\n"
"\tjecxz 1f\n"
"2:\tpushl -4(%edx,%ecx,4)\n"
"\tloop 2b\n"
"1:\tcall *8(%ebp)\n"
"\tmovl %ebp,%esp\n"
"\tleave\n"
"\tret" );
/***********************************************************************
* RELAY_CallFrom32
*
* Stack layout on entry to this function:
* ... ...
* (esp+12) arg2
* (esp+8) arg1
* (esp+4) ret_addr
* (esp) return addr to relay code
*/
static LONGLONG RELAY_CallFrom32( int ret_addr, ... )
{
LONGLONG ret;
char buffer[80];
int *args = &ret_addr + 1;
/* Relay addr is the return address for this function */
BYTE *relay_addr = (BYTE *)__builtin_return_address(0);
DEBUG_ENTRY_POINT *relay = (DEBUG_ENTRY_POINT *)(relay_addr - 5);
WORD nb_args = relay->args / sizeof(int);
if (TRACE_ON(relay))
{
get_entry_point( buffer, relay );
DPRINTF( "%04lx:Call %s(", GetCurrentThreadId(), buffer );
RELAY_PrintArgs( args, nb_args, relay->argtypes );
DPRINTF( ") ret=%08x\n", ret_addr );
}
ret = call_entry_point( relay->orig, nb_args, args );
if (TRACE_ON(relay))
{
BOOL ret64 = (relay->argtypes & 0x80000000) && (nb_args < 16);
if (ret64)
DPRINTF( "%04lx:Ret %s() retval=%08x%08x ret=%08x\n",
GetCurrentThreadId(),
buffer, (UINT)(ret >> 32), (UINT)ret, ret_addr );
else
DPRINTF( "%04lx:Ret %s() retval=%08x ret=%08x\n",
GetCurrentThreadId(),
buffer, (UINT)ret, ret_addr );
}
return ret;
}
/***********************************************************************
* RELAY_CallFrom32Regs
*
* Stack layout (esp is context->Esp, not the current %esp):
*
* ...
* (esp+4) first arg
* (esp) return addr to caller
* (esp-4) return addr to DEBUG_ENTRY_POINT
* (esp-8) ptr to relay entry code for RELAY_CallFrom32Regs
* ... >128 bytes space free to be modified (ensured by the assembly glue)
*/
void WINAPI __regs_RELAY_CallFrom32Regs( CONTEXT86 *context )
{
char buffer[80];
int* args;
int args_copy[17];
BYTE *entry_point;
BYTE *relay_addr = *((BYTE **)context->Esp - 1);
DEBUG_ENTRY_POINT *relay = (DEBUG_ENTRY_POINT *)(relay_addr - 5);
WORD nb_args = relay->args / sizeof(int);
/* remove extra stuff from the stack */
context->Eip = *(DWORD *)context->Esp;
context->Esp += sizeof(DWORD);
args = (int *)context->Esp;
if (relay->ret == 0xc2) /* stdcall */
context->Esp += nb_args * sizeof(int);
entry_point = (BYTE *)relay->orig;
assert( *entry_point == 0xe8 /* lcall */ );
if (TRACE_ON(relay))
{
get_entry_point( buffer, relay );
DPRINTF( "%04lx:Call %s(", GetCurrentThreadId(), buffer );
RELAY_PrintArgs( args, nb_args, relay->argtypes );
DPRINTF( ") ret=%08lx fs=%04lx\n", context->Eip, context->SegFs );
DPRINTF(" eax=%08lx ebx=%08lx ecx=%08lx edx=%08lx esi=%08lx edi=%08lx\n",
context->Eax, context->Ebx, context->Ecx,
context->Edx, context->Esi, context->Edi );
DPRINTF(" ebp=%08lx esp=%08lx ds=%04lx es=%04lx gs=%04lx flags=%08lx\n",
context->Ebp, context->Esp, context->SegDs,
context->SegEs, context->SegGs, context->EFlags );
}
/* Now call the real function */
memcpy( args_copy, args, nb_args * sizeof(args[0]) );
args_copy[nb_args] = (int)context; /* append context argument */
call_entry_point( (entry_point + 5 + *(DWORD *)(entry_point + 5)), nb_args+1, args_copy );
if (TRACE_ON(relay))
{
DPRINTF( "%04lx:Ret %s() retval=%08lx ret=%08lx fs=%04lx\n",
GetCurrentThreadId(),
buffer, context->Eax, context->Eip, context->SegFs );
DPRINTF(" eax=%08lx ebx=%08lx ecx=%08lx edx=%08lx esi=%08lx edi=%08lx\n",
context->Eax, context->Ebx, context->Ecx,
context->Edx, context->Esi, context->Edi );
DPRINTF(" ebp=%08lx esp=%08lx ds=%04lx es=%04lx gs=%04lx flags=%08lx\n",
context->Ebp, context->Esp, context->SegDs,
context->SegEs, context->SegGs, context->EFlags );
}
}
void WINAPI RELAY_CallFrom32Regs(void);
DEFINE_REGS_ENTRYPOINT( RELAY_CallFrom32Regs, 0, 0 );
/* check whether the function at addr starts with a call to __wine_call_from_32_regs */
static BOOL is_register_entry_point( const BYTE *addr )
{
extern void __wine_call_from_32_regs();
const int *offset;
const void *ptr;
if (*addr != 0xe8) return FALSE; /* not a call */
/* check if call target is __wine_call_from_32_regs */
offset = (const int *)(addr + 1);
if (*offset == (const char *)__wine_call_from_32_regs - (const char *)(offset + 1)) return TRUE;
/* now check if call target is an import table jump to __wine_call_from_32_regs */
addr = (const BYTE *)(offset + 1) + *offset;
/* Note: the following checks depend on the asm code generated by winebuild */
if (addr[0] == 0xff && addr[1] == 0x25) /* indirect jmp */
{
ptr = *(const void * const*)(addr + 2); /* get indirect jmp target address */
}
else /* check for import thunk */
{
if (addr[0] != 0x50) return FALSE; /* pushl %eax */
if (addr[1] != 0xe8 || addr[2] || addr[3] || addr[4] || addr[5]) return FALSE; /* call .+0 */
if (addr[6] != 0x58) return FALSE; /* popl %eax */
if (addr[7] != 0x8b || addr[8] != 0x80) return FALSE; /* movl offset(%eax),%eax */
ptr = addr + 6 + *(const int *)(addr + 9);
}
return (*(const char * const*)ptr == (char *)__wine_call_from_32_regs);
}
/***********************************************************************
* RELAY_GetProcAddress
*
* Return the proc address to use for a given function.
*/
FARPROC RELAY_GetProcAddress( HMODULE module, const IMAGE_EXPORT_DIRECTORY *exports,
DWORD exp_size, FARPROC proc, const WCHAR *user )
{
const DEBUG_ENTRY_POINT *debug = (DEBUG_ENTRY_POINT *)proc;
const DEBUG_ENTRY_POINT *list = (const DEBUG_ENTRY_POINT *)((const char *)exports + exp_size);
if (debug < list || debug >= list + exports->NumberOfFunctions) return proc;
if (list + (debug - list) != debug) return proc; /* not a valid address */
if (check_from_module( debug_from_relay_includelist, debug_from_relay_excludelist, user ))
return proc; /* we want to relay it */
if (!debug->call) return proc; /* not a normal function */
if (debug->call != 0xe8 && debug->call != 0xe9) return proc; /* not a debug thunk at all */
return debug->orig;
}
/***********************************************************************
* RELAY_SetupDLL
*
* Setup relay debugging for a built-in dll.
*/
void RELAY_SetupDLL( HMODULE module )
{
IMAGE_EXPORT_DIRECTORY *exports;
DEBUG_ENTRY_POINT *debug;
DWORD *funcs;
unsigned int i;
const char *name;
char *p, dllname[80];
DWORD size;
if (!init_done) init_debug_lists();
exports = RtlImageDirectoryEntryToData( module, TRUE, IMAGE_DIRECTORY_ENTRY_EXPORT, &size );
if (!exports) return;
debug = (DEBUG_ENTRY_POINT *)((char *)exports + size);
funcs = (DWORD *)((char *)module + exports->AddressOfFunctions);
strcpy( dllname, (char *)module + exports->Name );
p = dllname + strlen(dllname) - 4;
if (p > dllname && !strcasecmp( p, ".dll" )) *p = 0;
for (i = 0; i < exports->NumberOfFunctions; i++, funcs++, debug++)
{
int on = 1;
if (!debug->call) continue; /* not a normal function */
if (debug->call != 0xe8 && debug->call != 0xe9) break; /* not a debug thunk at all */
name = find_exported_name( module, exports, i + exports->Base );
on = check_relay_include( dllname, i + exports->Base, name );
if (on)
{
debug->call = 0xe8; /* call relative */
if (is_register_entry_point( debug->orig ))
debug->callfrom32 = (char *)RELAY_CallFrom32Regs - (char *)&debug->ret;
else
debug->callfrom32 = (char *)RELAY_CallFrom32 - (char *)&debug->ret;
}
else
{
debug->call = 0xe9; /* jmp relative */
debug->callfrom32 = (char *)debug->orig - (char *)&debug->ret;
}
*funcs = (char *)debug - (char *)module;
}
}
/***********************************************************************
* SNOOP_ShowDebugmsgSnoop
*
* Simple function to decide if a particular debugging message is
* wanted.
*/
static BOOL SNOOP_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;
}
/***********************************************************************
* SNOOP_SetupDLL
*
* Setup snoop debugging for a native dll.
*/
void SNOOP_SetupDLL(HMODULE hmod)
{
SNOOP_DLL **dll = &firstdll;
char *p, *name;
void *addr;
SIZE_T size;
IMAGE_EXPORT_DIRECTORY *exports;
if (!init_done) init_debug_lists();
exports = RtlImageDirectoryEntryToData( hmod, TRUE, IMAGE_DIRECTORY_ENTRY_EXPORT, &size );
if (!exports) return;
name = (char *)hmod + exports->Name;
TRACE_(snoop)("hmod=%p, name=%s\n", hmod, name);
while (*dll) {
if ((*dll)->hmod == hmod)
{
/* another dll, loaded at the same address */
addr = (*dll)->funs;
size = (*dll)->nrofordinals * sizeof(SNOOP_FUN);
NtFreeVirtualMemory(NtCurrentProcess(), &addr, &size, MEM_RELEASE);
break;
}
dll = &((*dll)->next);
}
if (*dll)
*dll = RtlReAllocateHeap(GetProcessHeap(),
HEAP_ZERO_MEMORY, *dll,
sizeof(SNOOP_DLL) + strlen(name));
else
*dll = RtlAllocateHeap(GetProcessHeap(),
HEAP_ZERO_MEMORY,
sizeof(SNOOP_DLL) + strlen(name));
(*dll)->hmod = hmod;
(*dll)->ordbase = exports->Base;
(*dll)->nrofordinals = exports->NumberOfFunctions;
strcpy( (*dll)->name, name );
p = (*dll)->name + strlen((*dll)->name) - 4;
if (p > (*dll)->name && !strcasecmp( p, ".dll" )) *p = 0;
size = exports->NumberOfFunctions * sizeof(SNOOP_FUN);
addr = NULL;
NtAllocateVirtualMemory(NtCurrentProcess(), &addr, 0, &size,
MEM_COMMIT | MEM_RESERVE, PAGE_EXECUTE_READWRITE);
if (!addr) {
RtlFreeHeap(GetProcessHeap(),0,*dll);
FIXME("out of memory\n");
return;
}
(*dll)->funs = addr;
memset((*dll)->funs,0,size);
}
/***********************************************************************
* SNOOP_GetProcAddress
*
* Return the proc address to use for a given function.
*/
FARPROC SNOOP_GetProcAddress( HMODULE hmod, const IMAGE_EXPORT_DIRECTORY *exports,
DWORD exp_size, FARPROC origfun, DWORD ordinal,
const WCHAR *user)
{
unsigned int i;
const char *ename;
const WORD *ordinals;
const DWORD *names;
SNOOP_DLL *dll = firstdll;
SNOOP_FUN *fun;
const IMAGE_SECTION_HEADER *sec;
if (!TRACE_ON(snoop)) return origfun;
if (!check_from_module( debug_from_snoop_includelist, debug_from_snoop_excludelist, user ))
return origfun; /* the calling module was explicitly excluded */
if (!*(LPBYTE)origfun) /* 0x00 is an imposs. opcode, poss. dataref. */
return origfun;
sec = RtlImageRvaToSection( RtlImageNtHeader(hmod), hmod, (char *)origfun - (char *)hmod );
if (!sec || !(sec->Characteristics & IMAGE_SCN_CNT_CODE))
return origfun; /* most likely a data reference */
while (dll) {
if (hmod == dll->hmod)
break;
dll = dll->next;
}
if (!dll) /* probably internal */
return origfun;
/* try to find a name for it */
ename = NULL;
names = (const DWORD *)((const char *)hmod + exports->AddressOfNames);
ordinals = (const WORD *)((const char *)hmod + exports->AddressOfNameOrdinals);
if (names) for (i = 0; i < exports->NumberOfNames; i++)
{
if (ordinals[i] == ordinal)
{
ename = (const char *)hmod + names[i];
break;
}
}
if (!SNOOP_ShowDebugmsgSnoop(dll->name,ordinal,ename))
return origfun;
assert(ordinal < dll->nrofordinals);
fun = dll->funs + ordinal;
if (!fun->name)
{
fun->name = ename;
fun->lcall = 0xe8;
/* NOTE: origreturn struct member MUST come directly after snoopentry */
fun->snoopentry = (char*)SNOOP_Entry-((char*)(&fun->nrofargs));
fun->origfun = origfun;
fun->nrofargs = -1;
}
return (FARPROC)&(fun->lcall);
}
static void SNOOP_PrintArg(DWORD x)
{
int i,nostring;
DPRINTF("%08lx",x);
if (!HIWORD(x) || TRACE_ON(seh)) return; /* trivial reject to avoid faults */
__TRY
{
LPBYTE s=(LPBYTE)x;
i=0;nostring=0;
while (i<80) {
if (s[i]==0) break;
if (s[i]<0x20) {nostring=1;break;}
if (s[i]>=0x80) {nostring=1;break;}
i++;
}
if (!nostring && i > 5)
DPRINTF(" %s",debugstr_an((LPSTR)x,i));
else /* try unicode */
{
LPWSTR s=(LPWSTR)x;
i=0;nostring=0;
while (i<80) {
if (s[i]==0) break;
if (s[i]<0x20) {nostring=1;break;}
if (s[i]>0x100) {nostring=1;break;}
i++;
}
if (!nostring && i > 5) DPRINTF(" %s",debugstr_wn((LPWSTR)x,i));
}
}
__EXCEPT(page_fault)
{
}
__ENDTRY
}
#define CALLER1REF (*(DWORD*)context->Esp)
void WINAPI __regs_SNOOP_Entry( CONTEXT86 *context )
{
DWORD ordinal=0,entry = context->Eip - 5;
SNOOP_DLL *dll = firstdll;
SNOOP_FUN *fun = NULL;
SNOOP_RETURNENTRIES **rets = &firstrets;
SNOOP_RETURNENTRY *ret;
int i=0, max;
while (dll) {
if ( ((char*)entry>=(char*)dll->funs) &&
((char*)entry<=(char*)(dll->funs+dll->nrofordinals))
) {
fun = (SNOOP_FUN*)entry;
ordinal = fun-dll->funs;
break;
}
dll=dll->next;
}
if (!dll) {
FIXME("entrypoint 0x%08lx not found\n",entry);
return; /* oops */
}
/* guess cdecl ... */
if (fun->nrofargs<0) {
/* Typical cdecl return frame is:
* add esp, xxxxxxxx
* which has (for xxxxxxxx up to 255 the opcode "83 C4 xx".
* (after that 81 C2 xx xx xx xx)
*/
LPBYTE reteip = (LPBYTE)CALLER1REF;
if (reteip) {
if ((reteip[0]==0x83)&&(reteip[1]==0xc4))
fun->nrofargs=reteip[2]/4;
}
}
while (*rets) {
for (i=0;i<sizeof((*rets)->entry)/sizeof((*rets)->entry[0]);i++)
if (!(*rets)->entry[i].origreturn)
break;
if (i!=sizeof((*rets)->entry)/sizeof((*rets)->entry[0]))
break;
rets = &((*rets)->next);
}
if (!*rets) {
SIZE_T size = 4096;
VOID* addr = NULL;
NtAllocateVirtualMemory(NtCurrentProcess(), &addr, 0, &size,
MEM_COMMIT | MEM_RESERVE,
PAGE_EXECUTE_READWRITE);
if (!addr) return;
*rets = addr;
memset(*rets,0,4096);
i = 0; /* entry 0 is free */
}
ret = &((*rets)->entry[i]);
ret->lcall = 0xe8;
/* NOTE: origreturn struct member MUST come directly after snoopret */
ret->snoopret = ((char*)SNOOP_Return)-(char*)(&ret->origreturn);
ret->origreturn = (FARPROC)CALLER1REF;
CALLER1REF = (DWORD)&ret->lcall;
ret->dll = dll;
ret->args = NULL;
ret->ordinal = ordinal;
ret->origESP = context->Esp;
context->Eip = (DWORD)fun->origfun;
if (fun->name) DPRINTF("%04lx:CALL %s.%s(",GetCurrentThreadId(),dll->name,fun->name);
else DPRINTF("%04lx:CALL %s.%ld(",GetCurrentThreadId(),dll->name,dll->ordbase+ordinal);
if (fun->nrofargs>0) {
max = fun->nrofargs; if (max>16) max=16;
for (i=0;i<max;i++)
{
SNOOP_PrintArg(*(DWORD*)(context->Esp + 4 + sizeof(DWORD)*i));
if (i<fun->nrofargs-1) DPRINTF(",");
}
if (max!=fun->nrofargs)
DPRINTF(" ...");
} else if (fun->nrofargs<0) {
DPRINTF("<unknown, check return>");
ret->args = RtlAllocateHeap(GetProcessHeap(),
0,16*sizeof(DWORD));
memcpy(ret->args,(LPBYTE)(context->Esp + 4),sizeof(DWORD)*16);
}
DPRINTF(") ret=%08lx\n",(DWORD)ret->origreturn);
}
void WINAPI __regs_SNOOP_Return( CONTEXT86 *context )
{
SNOOP_RETURNENTRY *ret = (SNOOP_RETURNENTRY*)(context->Eip - 5);
SNOOP_FUN *fun = &ret->dll->funs[ret->ordinal];
/* We haven't found out the nrofargs yet. If we called a cdecl
* function it is too late anyway and we can just set '0' (which
* will be the difference between orig and current ESP
* If stdcall -> everything ok.
*/
if (ret->dll->funs[ret->ordinal].nrofargs<0)
ret->dll->funs[ret->ordinal].nrofargs=(context->Esp - ret->origESP-4)/4;
context->Eip = (DWORD)ret->origreturn;
if (ret->args) {
int i,max;
if (fun->name)
DPRINTF("%04lx:RET %s.%s(", GetCurrentThreadId(), ret->dll->name, fun->name);
else
DPRINTF("%04lx:RET %s.%ld(", GetCurrentThreadId(),
ret->dll->name,ret->dll->ordbase+ret->ordinal);
max = fun->nrofargs;
if (max>16) max=16;
for (i=0;i<max;i++)
{
SNOOP_PrintArg(ret->args[i]);
if (i<max-1) DPRINTF(",");
}
DPRINTF(") retval=%08lx ret=%08lx\n",
context->Eax,(DWORD)ret->origreturn );
RtlFreeHeap(GetProcessHeap(),0,ret->args);
ret->args = NULL;
}
else
{
if (fun->name)
DPRINTF("%04lx:RET %s.%s() retval=%08lx ret=%08lx\n",
GetCurrentThreadId(),
ret->dll->name, fun->name, context->Eax, (DWORD)ret->origreturn);
else
DPRINTF("%04lx:RET %s.%ld() retval=%08lx ret=%08lx\n",
GetCurrentThreadId(),
ret->dll->name,ret->dll->ordbase+ret->ordinal,
context->Eax, (DWORD)ret->origreturn);
}
ret->origreturn = NULL; /* mark as empty */
}
/* assembly wrappers that save the context */
DEFINE_REGS_ENTRYPOINT( SNOOP_Entry, 0, 0 );
DEFINE_REGS_ENTRYPOINT( SNOOP_Return, 0, 0 );
#else /* __i386__ */
FARPROC RELAY_GetProcAddress( HMODULE module, const IMAGE_EXPORT_DIRECTORY *exports,
DWORD exp_size, FARPROC proc, const WCHAR *user )
{
return proc;
}
FARPROC SNOOP_GetProcAddress( HMODULE hmod, const IMAGE_EXPORT_DIRECTORY *exports, DWORD exp_size,
FARPROC origfun, DWORD ordinal, const WCHAR *user )
{
return origfun;
}
void RELAY_SetupDLL( HMODULE module )
{
}
void SNOOP_SetupDLL( HMODULE hmod )
{
FIXME("snooping works only on i386 for now.\n");
}
#endif /* __i386__ */
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