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wine/dlls/kernel32/snoop16.c

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/*
* 386-specific Win16 dll<->dll snooping functions
*
* 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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
*/
#include "config.h"
#include "wine/port.h"
#include <assert.h>
#include <string.h>
#include <stdarg.h>
#include <stdio.h>
#include "windef.h"
#include "winbase.h"
#include "winnt.h"
#include "wine/winbase16.h"
#include "winternl.h"
#include "wine/library.h"
#include "kernel_private.h"
#include "kernel16_private.h"
#include "toolhelp.h"
#include "wine/debug.h"
WINE_DEFAULT_DEBUG_CHANNEL(snoop);
#ifdef __i386__
#include "pshpack1.h"
void WINAPI SNOOP16_Entry(FARPROC proc, LPBYTE args, CONTEXT86 *context);
void WINAPI SNOOP16_Return(FARPROC proc, LPBYTE args, CONTEXT86 *context);
typedef struct tagSNOOP16_FUN {
/* code part */
BYTE lcall; /* 0x9a call absolute with segment */
DWORD snr;
/* unreached */
int nrofargs;
FARPROC16 origfun;
char *name;
} SNOOP16_FUN;
typedef struct tagSNOOP16_DLL {
HMODULE16 hmod;
HANDLE16 funhandle;
SNOOP16_FUN *funs;
struct tagSNOOP16_DLL *next;
char name[1];
} SNOOP16_DLL;
typedef struct tagSNOOP16_RETURNENTRY {
/* code part */
BYTE lcall; /* 0x9a call absolute with segment */
DWORD snr;
/* unreached */
FARPROC16 origreturn;
SNOOP16_DLL *dll;
DWORD ordinal;
WORD origSP;
WORD *args; /* saved args across a stdcall */
} SNOOP16_RETURNENTRY;
typedef struct tagSNOOP16_RETURNENTRIES {
SNOOP16_RETURNENTRY entry[65500/sizeof(SNOOP16_RETURNENTRY)];
HANDLE16 rethandle;
struct tagSNOOP16_RETURNENTRIES *next;
} SNOOP16_RETURNENTRIES;
typedef struct tagSNOOP16_RELAY {
WORD pushbp; /* 0x5566 */
BYTE pusheax; /* 0x50 */
WORD pushax; /* 0x5066 */
BYTE pushl; /* 0x68 */
DWORD realfun; /* SNOOP16_Return */
BYTE lcall; /* 0x9a call absolute with segment */
DWORD callfromregs;
WORD seg;
WORD lret; /* 0xcb66 */
} SNOOP16_RELAY;
#include "poppack.h"
static SNOOP16_DLL *firstdll = NULL;
static SNOOP16_RETURNENTRIES *firstrets = NULL;
static SNOOP16_RELAY *snr;
static HANDLE16 xsnr = 0;
void
SNOOP16_RegisterDLL(HMODULE16 hModule,LPCSTR name) {
SNOOP16_DLL **dll = &(firstdll);
char *s;
if (!TRACE_ON(snoop)) return;
TRACE("hmod=%x, name=%s\n", hModule, name);
if (!snr) {
xsnr=GLOBAL_Alloc(GMEM_ZEROINIT,2*sizeof(*snr),0,WINE_LDT_FLAGS_CODE|WINE_LDT_FLAGS_32BIT);
snr = GlobalLock16(xsnr);
snr[0].pushbp = 0x5566;
snr[0].pusheax = 0x50;
snr[0].pushax = 0x5066;
snr[0].pushl = 0x68;
snr[0].realfun = (DWORD)SNOOP16_Entry;
snr[0].lcall = 0x9a;
snr[0].callfromregs = (DWORD)__wine_call_from_16_regs;
snr[0].seg = wine_get_cs();
snr[0].lret = 0xcb66;
snr[1].pushbp = 0x5566;
snr[1].pusheax = 0x50;
snr[1].pushax = 0x5066;
snr[1].pushl = 0x68;
snr[1].realfun = (DWORD)SNOOP16_Return;
snr[1].lcall = 0x9a;
snr[1].callfromregs = (DWORD)__wine_call_from_16_regs;
snr[1].seg = wine_get_cs();
snr[1].lret = 0xcb66;
}
while (*dll) {
if ((*dll)->hmod == hModule)
{
/* another dll, loaded at the same address */
GlobalUnlock16((*dll)->funhandle);
GlobalFree16((*dll)->funhandle);
break;
}
dll = &((*dll)->next);
}
if (*dll)
*dll = HeapReAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, *dll, sizeof(SNOOP16_DLL)+strlen(name));
else
*dll = HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, sizeof(SNOOP16_DLL)+strlen(name));
(*dll)->next = NULL;
(*dll)->hmod = hModule;
if ((s=strrchr(name,'\\')))
name = s+1;
strcpy( (*dll)->name, name );
if ((s=strrchr((*dll)->name,'.')))
*s='\0';
(*dll)->funhandle = GlobalHandleToSel16(GLOBAL_Alloc(GMEM_ZEROINIT,65535,0,WINE_LDT_FLAGS_CODE));
(*dll)->funs = GlobalLock16((*dll)->funhandle);
if (!(*dll)->funs) {
HeapFree(GetProcessHeap(),0,*dll);
FIXME("out of memory\n");
return;
}
}
FARPROC16
SNOOP16_GetProcAddress16(HMODULE16 hmod,DWORD ordinal,FARPROC16 origfun) {
SNOOP16_DLL *dll = firstdll;
SNOOP16_FUN *fun;
NE_MODULE *pModule = NE_GetPtr(hmod);
unsigned char *cpnt;
char name[200];
if (!TRACE_ON(snoop) || !pModule || !HIWORD(origfun))
return origfun;
if (!*(LPBYTE)MapSL((SEGPTR)origfun)) /* 0x00 is an imposs. opcode, poss. dataref. */
return origfun;
while (dll) {
if (hmod == dll->hmod)
break;
dll=dll->next;
}
if (!dll) /* probably internal */
return origfun;
if (ordinal>65535/sizeof(SNOOP16_FUN))
return origfun;
fun = dll->funs+ordinal;
/* already done? */
fun->lcall = 0x9a;
fun->snr = MAKELONG(0,xsnr);
fun->origfun = origfun;
if (fun->name)
return (FARPROC16)(SEGPTR)MAKELONG(((char*)fun-(char*)dll->funs),dll->funhandle);
cpnt = (unsigned char *)pModule + pModule->ne_restab;
while (*cpnt) {
cpnt += *cpnt + 1 + sizeof(WORD);
if (*(WORD*)(cpnt+*cpnt+1) == ordinal) {
sprintf(name,"%.*s",*cpnt,cpnt+1);
break;
}
}
/* Now search the non-resident names table */
if (!*cpnt && pModule->nrname_handle) {
cpnt = (unsigned char *)GlobalLock16( pModule->nrname_handle );
while (*cpnt) {
cpnt += *cpnt + 1 + sizeof(WORD);
if (*(WORD*)(cpnt+*cpnt+1) == ordinal) {
sprintf(name,"%.*s",*cpnt,cpnt+1);
break;
}
}
}
if (*cpnt)
{
fun->name = HeapAlloc(GetProcessHeap(),0,strlen(name)+1);
strcpy( fun->name, name );
}
else
fun->name = HeapAlloc(GetProcessHeap(),HEAP_ZERO_MEMORY,1); /* empty string */
if (!SNOOP16_ShowDebugmsgSnoop(dll->name, ordinal, fun->name))
return origfun;
/* more magic. do not try to snoop thunk data entries (MMSYSTEM) */
if (strchr(fun->name,'_')) {
char *s=strchr(fun->name,'_');
if (!strncasecmp(s,"_thunkdata",10)) {
HeapFree(GetProcessHeap(),0,fun->name);
fun->name = NULL;
return origfun;
}
}
fun->lcall = 0x9a;
fun->snr = MAKELONG(0,xsnr);
fun->origfun = origfun;
fun->nrofargs = -1;
return (FARPROC16)(SEGPTR)MAKELONG(((char*)fun-(char*)dll->funs),dll->funhandle);
}
#define CALLER1REF (*(DWORD*)(MapSL( MAKESEGPTR(context->SegSs,LOWORD(context->Esp)+4))))
void WINAPI SNOOP16_Entry(FARPROC proc, LPBYTE args, CONTEXT86 *context) {
DWORD ordinal=0;
DWORD entry=(DWORD)MapSL( MAKESEGPTR(context->SegCs,LOWORD(context->Eip)) )-5;
WORD xcs = context->SegCs;
SNOOP16_DLL *dll = firstdll;
SNOOP16_FUN *fun = NULL;
SNOOP16_RETURNENTRIES **rets = &firstrets;
SNOOP16_RETURNENTRY *ret;
unsigned i=0;
int max;
while (dll) {
if (xcs == dll->funhandle) {
fun = (SNOOP16_FUN*)entry;
ordinal = fun-dll->funs;
break;
}
dll=dll->next;
}
if (!dll) {
FIXME("entrypoint 0x%08x not found\n",entry);
return; /* oops */
}
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) {
HANDLE16 hand = GlobalHandleToSel16(GLOBAL_Alloc(GMEM_ZEROINIT,65535,0,WINE_LDT_FLAGS_CODE));
*rets = GlobalLock16(hand);
(*rets)->rethandle = hand;
i = 0; /* entry 0 is free */
}
ret = &((*rets)->entry[i]);
ret->lcall = 0x9a;
ret->snr = MAKELONG(sizeof(SNOOP16_RELAY),xsnr);
ret->origreturn = (FARPROC16)CALLER1REF;
CALLER1REF = MAKELONG((char*)&(ret->lcall)-(char*)((*rets)->entry),(*rets)->rethandle);
ret->dll = dll;
ret->args = NULL;
ret->ordinal = ordinal;
ret->origSP = LOWORD(context->Esp);
context->Eip= LOWORD(fun->origfun);
context->SegCs = HIWORD(fun->origfun);
DPRINTF("%04x:CALL %s.%d: %s(",GetCurrentThreadId(), dll->name,ordinal,fun->name);
if (fun->nrofargs>0) {
max = fun->nrofargs;
if (max>16) max=16;
for (i=max;i--;)
DPRINTF("%04x%s",*(WORD*)((char *) MapSL( MAKESEGPTR(context->SegSs,LOWORD(context->Esp)) )+8+sizeof(WORD)*i),i?",":"");
if (max!=fun->nrofargs)
DPRINTF(" ...");
} else if (fun->nrofargs<0) {
DPRINTF("<unknown, check return>");
ret->args = HeapAlloc(GetProcessHeap(),0,16*sizeof(WORD));
memcpy(ret->args,(LPBYTE)((char *) MapSL( MAKESEGPTR(context->SegSs,LOWORD(context->Esp)) )+8),sizeof(WORD)*16);
}
DPRINTF(") ret=%04x:%04x\n",HIWORD(ret->origreturn),LOWORD(ret->origreturn));
}
void WINAPI SNOOP16_Return(FARPROC proc, LPBYTE args, CONTEXT86 *context) {
SNOOP16_RETURNENTRY *ret = (SNOOP16_RETURNENTRY*)((char *) MapSL( MAKESEGPTR(context->SegCs,LOWORD(context->Eip)) )-5);
/* 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 SP
* If pascal -> everything ok.
*/
if (ret->dll->funs[ret->ordinal].nrofargs<0) {
ret->dll->funs[ret->ordinal].nrofargs=(LOWORD(context->Esp)-ret->origSP-4)/2;
}
context->Eip = LOWORD(ret->origreturn);
context->SegCs = HIWORD(ret->origreturn);
DPRINTF("%04x:RET %s.%d: %s(",
GetCurrentThreadId(),ret->dll->name,ret->ordinal,
ret->dll->funs[ret->ordinal].name);
if (ret->args) {
int i,max;
max = ret->dll->funs[ret->ordinal].nrofargs;
if (max>16)
max=16;
if (max<0)
max=0;
for (i=max;i--;)
DPRINTF("%04x%s",ret->args[i],i?",":"");
if (max!=ret->dll->funs[ret->ordinal].nrofargs)
DPRINTF(" ...");
HeapFree(GetProcessHeap(),0,ret->args);
ret->args = NULL;
}
DPRINTF(") retval = %04x:%04x ret=%04x:%04x\n",
(WORD)context->Edx,(WORD)context->Eax,
HIWORD(ret->origreturn),LOWORD(ret->origreturn));
ret->origreturn = NULL; /* mark as empty */
}
#else /* !__i386__ */
void SNOOP16_RegisterDLL(HMODULE16 hModule,LPCSTR name) {
if (!TRACE_ON(snoop)) return;
FIXME("snooping works only on i386 for now.\n");
}
FARPROC16 SNOOP16_GetProcAddress16(HMODULE16 hmod,DWORD ordinal,FARPROC16 origfun) {
return origfun;
}
#endif /* !__i386__ */
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