2 * 386-specific Win16 dll<->dll snooping functions
4 * Copyright 1998 Marcus Meissner
15 #include "selectors.h"
16 #include "stackframe.h"
23 void WINAPI
SNOOP16_Entry(CONTEXT
*context
);
24 void WINAPI
SNOOP16_Return(CONTEXT
*context
);
25 extern void CallFrom16_p_regs_();
27 /* Generic callfrom16_p_regs function entry.
29 * pushl $DOS3Call DWORD fun32
31 * .long CallFrom16_p_regs_ DWORD addr
32 * .long 0x90900023 WORD seg;nop;nop
35 typedef struct tagSNOOP16_FUN
{
37 BYTE lcall
; /* 0x9a call absolute with segment */
45 typedef struct tagSNOOP16_DLL
{
50 struct tagSNOOP16_DLL
*next
;
53 typedef struct tagSNOOP16_RETURNENTRY
{
55 BYTE lcall
; /* 0x9a call absolute with segment */
62 WORD
*args
; /* saved args across a stdcall */
63 } SNOOP16_RETURNENTRY
;
65 typedef struct tagSNOOP16_RETURNENTRIES
{
66 SNOOP16_RETURNENTRY entry
[65500/sizeof(SNOOP16_RETURNENTRY
)];
68 struct tagSNOOP16_RETURNENTRIES
*next
;
69 } SNOOP16_RETURNENTRIES
;
71 typedef struct tagSNOOP16_RELAY
{
73 BYTE prefix
; /* 0x66 , 32bit prefix */
74 BYTE pushbp
; /* 0x55 */
75 BYTE pushl
; /* 0x68 */
76 DWORD realfun
; /* SNOOP16_Return */
77 BYTE lcall
; /* 0x9a call absolute with segment */
85 static SNOOP16_DLL
*firstdll
= NULL
;
86 static SNOOP16_RETURNENTRIES
*firstrets
= NULL
;
87 static SNOOP16_RELAY
*snr
;
88 static HANDLE16 xsnr
= 0;
91 SNOOP16_RegisterDLL(NE_MODULE
*pModule
,LPCSTR name
) {
92 SNOOP16_DLL
**dll
= &(firstdll
);
95 if (!TRACE_ON(snoop
)) return;
97 xsnr
=GLOBAL_Alloc(GMEM_ZEROINIT
,2*sizeof(*snr
),0,TRUE
,TRUE
,FALSE
);
98 snr
= GlobalLock16(xsnr
);
100 snr
[0].pushbp
= 0x55;
102 snr
[0].realfun
= (DWORD
)SNOOP16_Entry
;
104 snr
[0].callfromregs
= (DWORD
)CallFrom16_p_regs_
;
106 snr
[1].prefix
= 0x66;
107 snr
[1].pushbp
= 0x55;
109 snr
[1].realfun
= (DWORD
)SNOOP16_Return
;
111 snr
[1].callfromregs
= (DWORD
)CallFrom16_p_regs_
;
115 if ((*dll
)->hmod
== pModule
->self
)
116 return; /* already registered */
117 dll
= &((*dll
)->next
);
119 *dll
= (SNOOP16_DLL
*)HeapAlloc(SystemHeap
,HEAP_ZERO_MEMORY
,sizeof(SNOOP16_DLL
));
121 (*dll
)->hmod
= pModule
->self
;
122 if ((s
=strrchr(name
,'\\')))
124 (*dll
)->name
= HEAP_strdupA(SystemHeap
,0,name
);
125 if ((s
=strrchr((*dll
)->name
,'.')))
127 (*dll
)->funhandle
= GlobalHandleToSel(GLOBAL_Alloc(GMEM_ZEROINIT
,65535,0,TRUE
,FALSE
,FALSE
));
128 (*dll
)->funs
= GlobalLock16((*dll
)->funhandle
);
130 HeapFree(SystemHeap
,0,*dll
);
131 FIXME(snoop
,"out of memory\n");
134 memset((*dll
)->funs
,0,65535);
138 SNOOP16_GetProcAddress16(HMODULE16 hmod
,DWORD ordinal
,FARPROC16 origfun
) {
139 SNOOP16_DLL
*dll
= firstdll
;
141 NE_MODULE
*pModule
= NE_GetPtr(hmod
);
145 if (!TRACE_ON(snoop
) || !pModule
|| !HIWORD(origfun
))
147 if (!*(LPBYTE
)PTR_SEG_TO_LIN(origfun
)) /* 0x00 is an imposs. opcode, poss. dataref. */
150 if (hmod
== dll
->hmod
)
154 if (!dll
) /* probably internal */
156 if (ordinal
>65535/sizeof(SNOOP16_FUN
))
158 fun
= dll
->funs
+ordinal
;
161 fun
->snr
= MAKELONG(0,xsnr
);
162 fun
->origfun
= origfun
;
164 return (FARPROC16
)(SEGPTR
)MAKELONG(((char*)fun
-(char*)dll
->funs
),dll
->funhandle
);
165 cpnt
= (unsigned char *)pModule
+ pModule
->name_table
;
167 cpnt
+= *cpnt
+ 1 + sizeof(WORD
);
168 if (*(WORD
*)(cpnt
+*cpnt
+1) == ordinal
) {
169 sprintf(name
,"%.*s",*cpnt
,cpnt
+1);
173 /* Now search the non-resident names table */
175 if (!*cpnt
&& pModule
->nrname_handle
) {
176 cpnt
= (char *)GlobalLock16( pModule
->nrname_handle
);
178 cpnt
+= *cpnt
+ 1 + sizeof(WORD
);
179 if (*(WORD
*)(cpnt
+*cpnt
+1) == ordinal
) {
180 sprintf(name
,"%.*s",*cpnt
,cpnt
+1);
186 fun
->name
= HEAP_strdupA(SystemHeap
,0,name
);
188 fun
->name
= HEAP_strdupA(SystemHeap
,0,"");
189 /* more magic. do not try to snoop thunk data entries (MMSYSTEM) */
190 if (strchr(fun
->name
,'_')) {
191 char *s
=strchr(fun
->name
,'_');
193 if (!strncasecmp(s
,"_thunkdata",10)) {
194 HeapFree(SystemHeap
,0,fun
->name
);
200 fun
->snr
= MAKELONG(0,xsnr
);
201 fun
->origfun
= origfun
;
203 return (FARPROC16
)(SEGPTR
)MAKELONG(((char*)fun
-(char*)dll
->funs
),dll
->funhandle
);
206 #define CALLER1REF (*(DWORD*)(PTR_SEG_OFF_TO_LIN(SS_reg(context),SP_reg(context)+4)))
207 void WINAPI
SNOOP16_Entry(CONTEXT
*context
) {
209 DWORD entry
=(DWORD
)PTR_SEG_OFF_TO_LIN(CS_reg(context
),IP_reg(context
))-5;
210 WORD xcs
= CS_reg(context
);
211 SNOOP16_DLL
*dll
= firstdll
;
212 SNOOP16_FUN
*fun
= NULL
;
213 SNOOP16_RETURNENTRIES
**rets
= &firstrets
;
214 SNOOP16_RETURNENTRY
*ret
;
218 if (xcs
== dll
->funhandle
) {
219 fun
= (SNOOP16_FUN
*)entry
;
220 ordinal
= fun
-dll
->funs
;
226 FIXME(snoop
,"entrypoint 0x%08lx not found\n",entry
);
229 /* guess cdecl ... */
230 if (fun
->nrofargs
<0) {
231 /* Typical cdecl return frame is:
233 * which has (for xxxxxxxx up to 255 the opcode "83 C4 xx".
235 LPBYTE reteip
= (LPBYTE
)PTR_SEG_TO_LIN(CALLER1REF
);
237 if ((reteip
[0]==0x83)&&(reteip
[1]==0xc4))
238 fun
->nrofargs
=reteip
[2]/2;
242 for (i
=0;i
<sizeof((*rets
)->entry
)/sizeof((*rets
)->entry
[0]);i
++)
243 if (!(*rets
)->entry
[i
].origreturn
)
245 if (i
!=sizeof((*rets
)->entry
)/sizeof((*rets
)->entry
[0]))
247 rets
= &((*rets
)->next
);
250 HANDLE16 hand
= GlobalHandleToSel(GLOBAL_Alloc(GMEM_ZEROINIT
,65535,0,TRUE
,FALSE
,FALSE
));
251 *rets
= GlobalLock16(hand
);
252 memset(*rets
,0,65535);
253 (*rets
)->rethandle
= hand
;
254 i
= 0; /* entry 0 is free */
256 ret
= &((*rets
)->entry
[i
]);
258 ret
->snr
= MAKELONG(sizeof(SNOOP16_RELAY
),xsnr
);
259 ret
->origreturn
= (FARPROC16
)CALLER1REF
;
260 CALLER1REF
= MAKELONG((char*)&(ret
->lcall
)-(char*)((*rets
)->entry
),(*rets
)->rethandle
);
263 ret
->ordinal
= ordinal
;
264 ret
->origSP
= SP_reg(context
);
266 IP_reg(context
)= LOWORD(fun
->origfun
);
267 CS_reg(context
)= HIWORD(fun
->origfun
);
269 DPRINTF("Call %s.%ld: %s(",dll
->name
,ordinal
,fun
->name
);
270 if (fun
->nrofargs
>0) {
271 max
= fun
->nrofargs
; if (max
>16) max
=16;
273 DPRINTF("%04x%s",*(WORD
*)(PTR_SEG_OFF_TO_LIN(SS_reg(context
),SP_reg(context
))+8+sizeof(WORD
)*i
),i
?",":"");
274 if (max
!=fun
->nrofargs
)
276 } else if (fun
->nrofargs
<0) {
277 DPRINTF("<unknown, check return>");
278 ret
->args
= HeapAlloc(SystemHeap
,0,16*sizeof(WORD
));
279 memcpy(ret
->args
,(LPBYTE
)(PTR_SEG_OFF_TO_LIN(SS_reg(context
),SP_reg(context
))+8),sizeof(WORD
)*16);
281 DPRINTF(") ret=%04x:%04x\n",HIWORD((DWORD
)(*rets
)->entry
[i
].origreturn
),LOWORD((DWORD
)(*rets
)->entry
[i
].origreturn
));
284 void WINAPI
SNOOP16_Return(CONTEXT
*context
) {
285 SNOOP16_RETURNENTRY
*ret
= (SNOOP16_RETURNENTRY
*)(PTR_SEG_OFF_TO_LIN(CS_reg(context
),IP_reg(context
))-5);
287 /* We haven't found out the nrofargs yet. If we called a cdecl
288 * function it is too late anyway and we can just set '0' (which
289 * will be the difference between orig and current SP
290 * If pascal -> everything ok.
292 if (ret
->dll
->funs
[ret
->ordinal
].nrofargs
<0)
293 ret
->dll
->funs
[ret
->ordinal
].nrofargs
=(SP_reg(context
)-ret
->origSP
-4)/2;
294 IP_reg(context
) = LOWORD(ret
->origreturn
);
295 CS_reg(context
) = HIWORD(ret
->origreturn
);
299 DPRINTF("Ret %s.%ld: %s(",ret
->dll
->name
,ret
->ordinal
,ret
->dll
->funs
[ret
->ordinal
].name
);
300 max
= ret
->dll
->funs
[ret
->ordinal
].nrofargs
;
304 DPRINTF("%04x%s",ret
->args
[i
],i
?",":"");
305 DPRINTF(") retval = %04x:%04x ret=%04x:%04x\n",
306 DX_reg(context
),AX_reg(context
),HIWORD(ret
->origreturn
),LOWORD(ret
->origreturn
)
308 HeapFree(SystemHeap
,0,ret
->args
);
311 DPRINTF("Ret %s.%ld: %s() retval = %04x:%04x ret=%04x:%04x\n",
312 ret
->dll
->name
,ret
->ordinal
,ret
->dll
->funs
[ret
->ordinal
].name
,
313 DX_reg(context
),AX_reg(context
),HIWORD(ret
->origreturn
),LOWORD(ret
->origreturn
)
315 ret
->origreturn
= NULL
; /* mark as empty */
317 #else /* !__i386__ */
318 void SNOOP16_RegisterDLL(NE_MODULE
*pModule
,LPCSTR name
) {
319 FIXME(snoop
,"snooping works only on i386 for now.\n");
323 FARPROC16
SNOOP16_GetProcAddress16(HMODULE16 hmod
,DWORD ordinal
,FARPROC16 origfun
) {
326 #endif /* !__i386__ */
330 fnSNOOP16_GetProcAddress16
=SNOOP16_GetProcAddress16
;
331 fnSNOOP16_RegisterDLL
=SNOOP16_RegisterDLL
;