From 0ccfc6f18ee6f98aa2fc15b62a3c482dd8b927f6 Mon Sep 17 00:00:00 2001
From: mdejong <mdejong>
Date: Thu, 28 Oct 2004 20:11:20 +0000
Subject: 	* win/tkWin32Dll.c (DllMain, _except_dllmain_detach_handler): 
 Back port HAVE_NO_SEH handler code from CVS HEAD to fix 	gcc build
 breakage caused by 2004-10-26 back port.

---
 ChangeLog        |   6 +++
 win/tkWin32Dll.c | 121 ++++++++++++++++++++++++++++++++++++++++++++++++++++++-
 2 files changed, 126 insertions(+), 1 deletion(-)

diff --git a/ChangeLog b/ChangeLog
index d1fcd12..8354bd4 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,9 @@
+2004-10-28  Mo DeJong  <mdejong@users.sourceforge.net>
+
+	* win/tkWin32Dll.c (DllMain, _except_dllmain_detach_handler):
+	Back port HAVE_NO_SEH handler code from CVS HEAD to fix
+	gcc build breakage caused by 2004-10-26 back port.
+
 2004-10-28  Don Porter	<dgp@users.sourceforge.net>
 
 	* README:				Bumped to patch level 8.4.8
diff --git a/win/tkWin32Dll.c b/win/tkWin32Dll.c
index fde647b..bf9ba29 100644
--- a/win/tkWin32Dll.c
+++ b/win/tkWin32Dll.c
@@ -8,18 +8,52 @@
  * See the file "license.terms" for information on usage and redistribution
  * of this file, and for a DISCLAIMER OF ALL WARRANTIES.
  *
- * RCS: @(#) $Id: tkWin32Dll.c,v 1.6.2.1 2004/10/27 00:37:38 davygrvy Exp $
+ * RCS: @(#) $Id: tkWin32Dll.c,v 1.6.2.2 2004/10/28 20:11:20 mdejong Exp $
  */
 
 #include "tkWinInt.h"
 #ifndef STATIC_BUILD
 
+#if defined(HAVE_NO_SEH) && defined(TCL_MEM_DEBUG)
+static void *INITIAL_ESP,
+            *INITIAL_EBP,
+            *INITIAL_HANDLER,
+            *RESTORED_ESP,
+            *RESTORED_EBP,
+            *RESTORED_HANDLER;
+#endif /* HAVE_NO_SEH && TCL_MEM_DEBUG */
+
+#ifdef HAVE_NO_SEH
+static
+__attribute__ ((cdecl))
+EXCEPTION_DISPOSITION
+_except_dllmain_detach_handler(
+    struct _EXCEPTION_RECORD *ExceptionRecord,
+    void *EstablisherFrame,
+    struct _CONTEXT *ContextRecord,
+    void *DispatcherContext);
+#endif /* HAVE_NO_SEH */
+
+#ifdef HAVE_NO_SEH
+
+/* Need to add noinline flag to DllMain declaration so that gcc -O3
+ * does not inline asm code into DllEntryPoint and cause a
+ * compile time error because of redefined local labels.
+ */
+
+BOOL WINAPI		DllMain(HINSTANCE hInst, DWORD reason, 
+				LPVOID reserved)
+                        __attribute__ ((noinline));
+
+#else
+
 /*
  * The following declaration is for the VC++ DLL entry point.
  */
 
 BOOL WINAPI		DllMain _ANSI_ARGS_((HINSTANCE hInst,
 			    DWORD reason, LPVOID reserved));
+#endif /* HAVE_NO_SEH */
 
 /*
  *----------------------------------------------------------------------
@@ -93,7 +127,27 @@ DllMain(hInstance, reason, reserved)
 	 * condition.
 	 */
 
+#ifdef HAVE_NO_SEH
+# ifdef TCL_MEM_DEBUG
+    __asm__ __volatile__ (
+            "movl %%esp,  %0" "\n\t"
+            "movl %%ebp,  %1" "\n\t"
+            "movl %%fs:0, %2" "\n\t"
+            : "=m"(INITIAL_ESP),
+              "=m"(INITIAL_EBP),
+              "=r"(INITIAL_HANDLER) );
+# endif /* TCL_MEM_DEBUG */
+            
+    __asm__ __volatile__ (
+            "pushl %%ebp" "\n\t"
+            "pushl %0" "\n\t"
+            "pushl %%fs:0" "\n\t"
+            "movl  %%esp, %%fs:0"
+            :
+            : "r" (_except_dllmain_detach_handler) );
+#else
 	__try {
+#endif /* HAVE_NO_SEH */
 	    /*
 	     * Run and remove our exit handlers, if they haven't already
 	     * been run.  Just in case we are being unloaded prior to
@@ -102,11 +156,76 @@ DllMain(hInstance, reason, reserved)
 	     */
 
 	    TkFinalize(NULL);
+
+#ifdef HAVE_NO_SEH
+    __asm__ __volatile__ (
+            "jmp  dllmain_detach_pop" "\n"
+        "dllmain_detach_reentry:" "\n\t"
+            "movl %%fs:0, %%eax" "\n\t"
+            "movl 0x8(%%eax), %%esp" "\n\t"
+            "movl 0x8(%%esp), %%ebp" "\n"
+        "dllmain_detach_pop:" "\n\t"
+            "movl (%%esp), %%eax" "\n\t"
+            "movl %%eax, %%fs:0" "\n\t"
+            "add  $12, %%esp" "\n\t"
+            :
+            :
+            : "%eax");
+
+# ifdef TCL_MEM_DEBUG
+    __asm__ __volatile__ (
+            "movl  %%esp,  %0" "\n\t"
+            "movl  %%ebp,  %1" "\n\t"
+            "movl  %%fs:0, %2" "\n\t"
+            : "=m"(RESTORED_ESP),
+              "=m"(RESTORED_EBP),
+              "=r"(RESTORED_HANDLER) );
+
+    if (INITIAL_ESP != RESTORED_ESP)
+        Tcl_Panic("ESP restored incorrectly");
+    if (INITIAL_EBP != RESTORED_EBP)
+        Tcl_Panic("EBP restored incorrectly");
+    if (INITIAL_HANDLER != RESTORED_HANDLER)
+        Tcl_Panic("HANDLER restored incorrectly");
+# endif /* TCL_MEM_DEBUG */
+#else
 	} __except (EXCEPTION_EXECUTE_HANDLER) {
 	    /* empty handler body */
 	}
+#endif /* HAVE_NO_SEH */
 	break;
     }
     return TRUE;
 }
+/*
+ *----------------------------------------------------------------------
+ *
+ * _except_dllmain_detach_handler --
+ *
+ *	SEH exception handler for DllMain.
+ *
+ * Results:
+ *	See DllMain.
+ *
+ * Side effects:
+ *	See DllMain.
+ *
+ *----------------------------------------------------------------------
+ */
+#ifdef HAVE_NO_SEH
+static
+__attribute__ ((cdecl))
+EXCEPTION_DISPOSITION
+_except_dllmain_detach_handler(
+    struct _EXCEPTION_RECORD *ExceptionRecord,
+    void *EstablisherFrame,
+    struct _CONTEXT *ContextRecord,
+    void *DispatcherContext)
+{
+    __asm__ __volatile__ (
+            "jmp dllmain_detach_reentry");
+    return 0; /* Function does not return */
+}
+#endif /* HAVE_NO_SEH */
+
 #endif /* !STATIC_BUILD */
-- 
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