1 files changed, 135 insertions, 0 deletions
diff --git a/gcc/config/i386/cygming-crtbegin.c b/gcc/config/i386/cygming-crtbegin.c
new file mode 100644
index 000000000..fc36cce25
--- /dev/null
+++ b/gcc/config/i386/cygming-crtbegin.c
@@ -0,0 +1,135 @@
+/* crtbegin object for windows32 targets.
+   Copyright (C) 2007, 2009, 2010  Free Software Foundation, Inc.
+
+   Contributed by Danny Smith <dannysmith@users.sourceforge.net>
+
+This file is part of GCC.
+
+GCC is free software; you can redistribute it and/or modify it under
+the terms of the GNU General Public License as published by the Free
+Software Foundation; either version 3, or (at your option) any later
+version.
+
+GCC is distributed in the hope that it will be useful, but WITHOUT ANY
+WARRANTY; without even the implied warranty of MERCHANTABILITY or
+FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+for more details.
+
+Under Section 7 of GPL version 3, you are granted additional
+permissions described in the GCC Runtime Library Exception, version
+3.1, as published by the Free Software Foundation.
+
+You should have received a copy of the GNU General Public License and
+a copy of the GCC Runtime Library Exception along with this program;
+see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
+<http://www.gnu.org/licenses/>.  */
+
+/* Target machine header files require this define. */
+#define IN_LIBGCC2
+
+#include "auto-host.h"
+#include "tconfig.h"
+#include "tsystem.h"
+#include "coretypes.h"
+#include "tm.h"
+#include "unwind-dw2-fde.h"
+
+#define WIN32_LEAN_AND_MEAN
+#include <windows.h>
+
+#ifndef LIBGCC_SONAME
+#define LIBGCC_SONAME "libgcc_s.dll"
+#endif
+
+#ifndef LIBGCJ_SONAME
+#define LIBGCJ_SONAME "libgcj_s.dll"
+#endif
+
+
+/* Make the declarations weak.  This is critical for
+   _Jv_RegisterClasses because it lives in libgcj.a  */
+extern void __register_frame_info (const void *, struct object *)
+				   TARGET_ATTRIBUTE_WEAK;
+extern void *__deregister_frame_info (const void *)
+				      TARGET_ATTRIBUTE_WEAK;
+extern void _Jv_RegisterClasses (const void *) TARGET_ATTRIBUTE_WEAK;
+
+#if defined(HAVE_LD_RO_RW_SECTION_MIXING)
+# define EH_FRAME_SECTION_CONST const
+#else
+# define EH_FRAME_SECTION_CONST
+#endif
+
+/* Stick a label at the beginning of the frame unwind info so we can
+   register/deregister it with the exception handling library code.  */
+#if DWARF2_UNWIND_INFO
+static EH_FRAME_SECTION_CONST char __EH_FRAME_BEGIN__[]
+  __attribute__((used, section(EH_FRAME_SECTION_NAME), aligned(4)))
+  = { };
+
+static struct object obj;
+#endif
+
+#if TARGET_USE_JCR_SECTION
+static void *__JCR_LIST__[]
+  __attribute__ ((used, section(JCR_SECTION_NAME), aligned(4)))
+  = { };
+#endif
+
+/* Pull in references from libgcc.a(unwind-dw2-fde.o) in the
+   startfile. These are referenced by a ctor and dtor in crtend.o.  */
+extern void __gcc_register_frame (void);
+extern void __gcc_deregister_frame (void);
+
+void
+__gcc_register_frame (void)
+{
+#if DWARF2_UNWIND_INFO
+/* Weak undefined symbols won't be pulled in from dlls; hence
+   we first test if the dll is already loaded and, if so,
+   get the symbol's address at run-time.  If the dll is not loaded,
+   fallback to weak linkage to static archive.  */
+
+  void (*register_frame_fn) (const void *, struct object *);
+  HANDLE h = GetModuleHandle (LIBGCC_SONAME);
+  if (h)
+    register_frame_fn = (void (*) (const void *, struct object *))
+			GetProcAddress (h, "__register_frame_info");
+  else 
+    register_frame_fn = __register_frame_info;
+  if (register_frame_fn)
+     register_frame_fn (__EH_FRAME_BEGIN__, &obj);
+#endif
+
+#if TARGET_USE_JCR_SECTION 
+  if (__JCR_LIST__[0])
+    {
+      void (*register_class_fn) (const void *);
+      HANDLE h = GetModuleHandle (LIBGCJ_SONAME);
+      if (h)
+	register_class_fn = (void (*) (const void *))
+			     GetProcAddress (h, "_Jv_RegisterClasses");
+      else
+	register_class_fn = _Jv_RegisterClasses;
+
+      if (register_class_fn)
+	register_class_fn (__JCR_LIST__);
+    }
+#endif
+}
+
+void
+__gcc_deregister_frame (void)
+{
+#if DWARF2_UNWIND_INFO
+  void *  (*deregister_frame_fn) (const void *);
+  HANDLE h = GetModuleHandle (LIBGCC_SONAME);
+  if (h)
+    deregister_frame_fn = (void* (*) (const void *))
+			  GetProcAddress (h, "__deregister_frame_info");
+  else 
+    deregister_frame_fn = __deregister_frame_info;
+  if (deregister_frame_fn)
+     deregister_frame_fn (__EH_FRAME_BEGIN__);
+#endif
+}