* win/tclWin32Dll.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, 69 insertions, 1 deletions

diff --git a/win/tclWin32Dll.c b/win/tclWin32Dll.c
index 579cf55..2bccd07 100644
--- a/win/tclWin32Dll.c
+++ b/win/tclWin32Dll.c
@@ -9,7 +9,7 @@
  * See the file "license.terms" for information on usage and redistribution
  * of this file, and for a DISCLAIMER OF ALL WARRANTIES.
  *
- * RCS: @(#) $Id: tclWin32Dll.c,v 1.30 2003/12/24 04:18:22 davygrvy Exp $
+ * RCS: @(#) $Id: tclWin32Dll.c,v 1.31 2003/12/26 04:12:16 mdejong Exp $
  */
 
 #include "tclWinInt.h"
@@ -255,18 +255,86 @@ DllMain(hInst, reason, reserved)
 	 * us from an exception handler and the state of the stack might
 	 * be unstable.
 	 */
+#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 */
   	    Tcl_Finalize();
+#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 */
 #endif /* __WIN32__ */