* win/tkWin32Dll.c (DllMain): Add HAVE_NO_SEH

	blocks in place of __try and __except statements
	to support gcc builds. This is needed after
	David's changes on 2003-12-21. [Tcl patch 858493]

1 files changed, 71 insertions, 1 deletions

diff --git a/win/tkWin32Dll.c b/win/tkWin32Dll.c
index f5aa7ed..e02b5ea 100644
--- a/win/tkWin32Dll.c
+++ b/win/tkWin32Dll.c
@@ -8,7 +8,7 @@
  * 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 1.7 2003/12/21 23:50:13 davygrvy Exp $
+ * RCS: @(#) $Id: tkWin32Dll.c,v 1.8 2003/12/26 04:14:38 mdejong Exp $
  */
 
 #include "tkWinInt.h"
@@ -93,7 +93,25 @@ 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 $__except_dllmain_detach_handler" "\n\t"
+            "pushl %fs:0" "\n\t"
+            "movl  %esp, %fs:0");
+#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
@@ -102,12 +120,64 @@ 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;
 }
+#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");
+    /* Nuke compiler warning about unused static function */
+    _except_dllmain_detach_handler(NULL, NULL, NULL, NULL);
+    return 0; /* Function does not return */
+}
+#endif /* HAVE_NO_SEH */
+
 #endif /* !STATIC_BUILD */