1 /* crtbegin object for windows32 targets.
2 Copyright (C) 2007, 2009 Free Software Foundation, Inc.
4 Contributed by Danny Smith <dannysmith@users.sourceforge.net>
6 This file is part of GCC.
8 GCC is free software; you can redistribute it and/or modify it under
9 the terms of the GNU General Public License as published by the Free
10 Software Foundation; either version 3, or (at your option) any later
13 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
14 WARRANTY; without even the implied warranty of MERCHANTABILITY or
15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
18 Under Section 7 of GPL version 3, you are granted additional
19 permissions described in the GCC Runtime Library Exception, version
20 3.1, as published by the Free Software Foundation.
22 You should have received a copy of the GNU General Public License and
23 a copy of the GCC Runtime Library Exception along with this program;
24 see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
25 <http://www.gnu.org/licenses/>. */
27 /* Target machine header files require this define. */
30 #include "auto-host.h"
33 #include "coretypes.h"
35 #include "unwind-dw2-fde.h"
37 #define WIN32_LEAN_AND_MEAN
41 #define LIBGCC_SONAME "libgcc_s.dll"
45 #define LIBGCJ_SONAME "libgcj_s.dll"
49 /* Make the declarations weak. This is critical for
50 _Jv_RegisterClasses because it lives in libgcj.a */
51 extern void __register_frame_info (const void *, struct object *)
52 TARGET_ATTRIBUTE_WEAK;
53 extern void *__deregister_frame_info (const void *)
54 TARGET_ATTRIBUTE_WEAK;
55 extern void _Jv_RegisterClasses (const void *) TARGET_ATTRIBUTE_WEAK;
57 #if defined(HAVE_LD_RO_RW_SECTION_MIXING)
58 # define EH_FRAME_SECTION_CONST const
60 # define EH_FRAME_SECTION_CONST
63 /* Stick a label at the beginning of the frame unwind info so we can
64 register/deregister it with the exception handling library code. */
65 #if DWARF2_UNWIND_INFO
66 static EH_FRAME_SECTION_CONST char __EH_FRAME_BEGIN__[]
67 __attribute__((section(EH_FRAME_SECTION_NAME), aligned(4)))
70 static struct object obj;
73 #if TARGET_USE_JCR_SECTION
74 static void *__JCR_LIST__[]
75 __attribute__ ((unused, section(JCR_SECTION_NAME), aligned(4)))
79 /* Pull in references from libgcc.a(unwind-dw2-fde.o) in the
80 startfile. These are referenced by a ctor and dtor in crtend.o. */
81 extern void __gcc_register_frame (void);
82 extern void __gcc_deregister_frame (void);
85 __gcc_register_frame (void)
87 #if DWARF2_UNWIND_INFO
88 /* Weak undefined symbols won't be pulled in from dlls; hence
89 we first test if the dll is already loaded and, if so,
90 get the symbol's address at run-time. If the dll is not loaded,
91 fallback to weak linkage to static archive. */
93 void (*register_frame_fn) (const void *, struct object *);
94 HANDLE h = GetModuleHandle (LIBGCC_SONAME);
96 register_frame_fn = (void (*) (const void *, struct object *))
97 GetProcAddress (h, "__register_frame_info");
99 register_frame_fn = __register_frame_info;
100 if (register_frame_fn)
101 register_frame_fn (__EH_FRAME_BEGIN__, &obj);
104 #if TARGET_USE_JCR_SECTION
107 void (*register_class_fn) (const void *);
108 HANDLE h = GetModuleHandle (LIBGCJ_SONAME);
110 register_class_fn = (void (*) (const void *))
111 GetProcAddress (h, "_Jv_RegisterClasses");
113 register_class_fn = _Jv_RegisterClasses;
115 if (register_class_fn)
116 register_class_fn (__JCR_LIST__);
122 __gcc_deregister_frame (void)
124 #if DWARF2_UNWIND_INFO
125 void * (*deregister_frame_fn) (const void *);
126 HANDLE h = GetModuleHandle (LIBGCC_SONAME);
128 deregister_frame_fn = (void* (*) (const void *))
129 GetProcAddress (h, "__deregister_frame_info");
131 deregister_frame_fn = __deregister_frame_info;
132 if (deregister_frame_fn)
133 deregister_frame_fn (__EH_FRAME_BEGIN__);