Zebediah Figura : krnl386: Call generated 16-bit entry points from the snoop thunks.

[Alexandre Julliard]

Module: wine
Branch: master
Commit: b035fe601dc61395c782f462d5072c9df87db7a9
URL:    https://source.winehq.org/git/wine.git/?a=commit;h=b035fe601dc61395c782f462d...

Author: Zebediah Figura <zfigura(a)codeweavers.com>
Date:   Tue Sep 28 20:39:05 2021 -0500

krnl386: Call generated 16-bit entry points from the snoop thunks.

Instead of manually building a STACK16FRAME.

Signed-off-by: Zebediah Figura <zfigura(a)codeweavers.com>
Signed-off-by: Alexandre Julliard <julliard(a)winehq.org>

---

 dlls/krnl386.exe16/krnl386.exe16.spec |  4 +++
 dlls/krnl386.exe16/snoop.c            | 56 ++++++-----------------------------
 2 files changed, 13 insertions(+), 47 deletions(-)

diff --git a/dlls/krnl386.exe16/krnl386.exe16.spec b/dlls/krnl386.exe16/krnl386.exe16.spec
index c6ffd9df701..6a55aad78f8 100644
--- a/dlls/krnl386.exe16/krnl386.exe16.spec
+++ b/dlls/krnl386.exe16/krnl386.exe16.spec
@@ -747,3 +747,7 @@
 # VxDs
 @ cdecl -arch=win32 -private __wine_vxd_open(wstr long ptr)
 @ cdecl -arch=win32 -private __wine_vxd_get_proc(long)
+
+# Snoop support
+2001 pascal -register __wine_snoop_entry()
+2002 pascal -register __wine_snoop_return()
diff --git a/dlls/krnl386.exe16/snoop.c b/dlls/krnl386.exe16/snoop.c
index 170796da390..d5c528d3382 100644
--- a/dlls/krnl386.exe16/snoop.c
+++ b/dlls/krnl386.exe16/snoop.c
@@ -34,13 +34,10 @@ WINE_DEFAULT_DEBUG_CHANNEL(snoop);
 
 #include "pshpack1.h"
 
-static void WINAPI SNOOP16_Entry(FARPROC proc, LPBYTE args, CONTEXT *context);
-static void WINAPI SNOOP16_Return(FARPROC proc, LPBYTE args, CONTEXT *context);
-
 typedef	struct tagSNOOP16_FUN {
 	/* code part */
 	BYTE		lcall;		/* 0x9a call absolute with segment */
-	DWORD		snr;
+	FARPROC16 snoop_entry;
 	/* unreached */
 	int		nrofargs;
 	FARPROC16	origfun;
@@ -58,7 +55,7 @@ typedef struct tagSNOOP16_DLL {
 typedef struct tagSNOOP16_RETURNENTRY {
 	/* code part */
 	BYTE		lcall;		/* 0x9a call absolute with segment */
-	DWORD		snr;
+	FARPROC16 snoop_return;
 	/* unreached */
 	FARPROC16	origreturn;
 	SNOOP16_DLL	*dll;
@@ -73,24 +70,10 @@ typedef struct tagSNOOP16_RETURNENTRIES {
 	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) {
@@ -102,29 +85,6 @@ SNOOP16_RegisterDLL(HMODULE16 hModule,LPCSTR name) {
 
         TRACE("hmod=%x, name=%s\n", hModule, name);
 
-	if (!snr) {
-		xsnr=GLOBAL_Alloc(GMEM_ZEROINIT,2*sizeof(*snr),0,LDT_FLAGS_CODE | 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      = 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      = get_cs();
-		snr[1].lret     = 0xcb66;
-	}
 	while (*dll) {
 		if ((*dll)->hmod == hModule)
                 {
@@ -181,7 +141,7 @@ SNOOP16_GetProcAddress16(HMODULE16 hmod,DWORD ordinal,FARPROC16 origfun) {
 	fun = dll->funs+ordinal;
 	/* already done? */
 	fun->lcall 	= 0x9a;
-	fun->snr	= MAKELONG(0,xsnr);
+	fun->snoop_entry = GetProcAddress16( GetModuleHandle16( "KERNEL" ), "__wine_snoop_entry" );
 	fun->origfun	= origfun;
 	if (fun->name)
 		return (FARPROC16)(SEGPTR)MAKELONG(((char*)fun-(char*)dll->funs),dll->funhandle);
@@ -227,14 +187,15 @@ SNOOP16_GetProcAddress16(HMODULE16 hmod,DWORD ordinal,FARPROC16 origfun) {
 		}
 	}
 	fun->lcall 	= 0x9a;
-	fun->snr	= MAKELONG(0,xsnr);
+	fun->snoop_entry = GetProcAddress16( GetModuleHandle16( "KERNEL" ), "__wine_snoop_entry" );
 	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))))
-static void WINAPI SNOOP16_Entry(FARPROC proc, LPBYTE args, CONTEXT *context) {
+void WINAPI __wine_snoop_entry( CONTEXT *context )
+{
 	DWORD		ordinal=0;
 	DWORD		entry=(DWORD)MapSL( MAKESEGPTR(context->SegCs,LOWORD(context->Eip)) )-5;
 	WORD		xcs = context->SegCs;
@@ -273,7 +234,7 @@ static void WINAPI SNOOP16_Entry(FARPROC proc, LPBYTE args, CONTEXT *context) {
 	}
 	ret = &((*rets)->entry[i]);
 	ret->lcall 	= 0x9a;
-	ret->snr	= MAKELONG(sizeof(SNOOP16_RELAY),xsnr);
+	ret->snoop_return = GetProcAddress16( GetModuleHandle16( "KERNEL" ), "__wine_snoop_return" );
 	ret->origreturn	= (FARPROC16)CALLER1REF;
 	CALLER1REF	= MAKELONG((char*)&(ret->lcall)-(char*)((*rets)->entry),(*rets)->rethandle);
 	ret->dll	= dll;
@@ -301,7 +262,8 @@ static void WINAPI SNOOP16_Entry(FARPROC proc, LPBYTE args, CONTEXT *context) {
 	TRACE(") ret=%04x:%04x\n",HIWORD(ret->origreturn),LOWORD(ret->origreturn));
 }
 
-static void WINAPI SNOOP16_Return(FARPROC proc, LPBYTE args, CONTEXT *context) {
+void WINAPI __wine_snoop_return( CONTEXT *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