1 /* crtbegin object for windows32 targets.
2 Copyright (C) 2007, 2009, 2010, 2011 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 "libgcc_tm.h"
36 #include "unwind-dw2-fde.h"
38 #define WIN32_LEAN_AND_MEAN
42 #define LIBGCC_SONAME "libgcc_s.dll"
46 #define LIBGCJ_SONAME "libgcj_s.dll"
50 /* Make the declarations weak. This is critical for
51 _Jv_RegisterClasses because it lives in libgcj.a */
52 extern void __register_frame_info (const void *, struct object *)
53 TARGET_ATTRIBUTE_WEAK;
54 extern void *__deregister_frame_info (const void *)
55 TARGET_ATTRIBUTE_WEAK;
56 extern void _Jv_RegisterClasses (const void *) TARGET_ATTRIBUTE_WEAK;
58 #if defined(HAVE_LD_RO_RW_SECTION_MIXING)
59 # define EH_FRAME_SECTION_CONST const
61 # define EH_FRAME_SECTION_CONST
64 /* Stick a label at the beginning of the frame unwind info so we can
65 register/deregister it with the exception handling library code. */
66 #if DWARF2_UNWIND_INFO
67 static EH_FRAME_SECTION_CONST char __EH_FRAME_BEGIN__[]
68 __attribute__((used, section(EH_FRAME_SECTION_NAME), aligned(4)))
71 static struct object obj;
74 #if TARGET_USE_JCR_SECTION
75 static void *__JCR_LIST__[]
76 __attribute__ ((used, section(JCR_SECTION_NAME), aligned(4)))
80 /* Pull in references from libgcc.a(unwind-dw2-fde.o) in the
81 startfile. These are referenced by a ctor and dtor in crtend.o. */
82 extern void __gcc_register_frame (void);
83 extern void __gcc_deregister_frame (void);
86 __gcc_register_frame (void)
88 #if DWARF2_UNWIND_INFO
89 /* Weak undefined symbols won't be pulled in from dlls; hence
90 we first test if the dll is already loaded and, if so,
91 get the symbol's address at run-time. If the dll is not loaded,
92 fallback to weak linkage to static archive. */
94 void (*register_frame_fn) (const void *, struct object *);
95 HANDLE h = GetModuleHandle (LIBGCC_SONAME);
97 register_frame_fn = (void (*) (const void *, struct object *))
98 GetProcAddress (h, "__register_frame_info");
100 register_frame_fn = __register_frame_info;
101 if (register_frame_fn)
102 register_frame_fn (__EH_FRAME_BEGIN__, &obj);
105 #if TARGET_USE_JCR_SECTION
108 void (*register_class_fn) (const void *);
109 HANDLE h = GetModuleHandle (LIBGCJ_SONAME);
111 register_class_fn = (void (*) (const void *))
112 GetProcAddress (h, "_Jv_RegisterClasses");
114 register_class_fn = _Jv_RegisterClasses;
116 if (register_class_fn)
117 register_class_fn (__JCR_LIST__);
123 __gcc_deregister_frame (void)
125 #if DWARF2_UNWIND_INFO
126 void * (*deregister_frame_fn) (const void *);
127 HANDLE h = GetModuleHandle (LIBGCC_SONAME);
129 deregister_frame_fn = (void* (*) (const void *))
130 GetProcAddress (h, "__deregister_frame_info");
132 deregister_frame_fn = __deregister_frame_info;
133 if (deregister_frame_fn)
134 deregister_frame_fn (__EH_FRAME_BEGIN__);