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9e51385b | 1 | /* crtbegin object for windows32 targets. |
f1717362 | 2 | Copyright (C) 2007-2016 Free Software Foundation, Inc. |
9e51385b | 3 | |
4 | Contributed by Danny Smith <dannysmith@users.sourceforge.net> | |
5 | ||
6 | This file is part of GCC. | |
7 | ||
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 | |
6bc9506f | 10 | Software Foundation; either version 3, or (at your option) any later |
9e51385b | 11 | version. |
12 | ||
9e51385b | 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 | |
16 | for more details. | |
17 | ||
6bc9506f | 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. | |
21 | ||
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/>. */ | |
9e51385b | 26 | |
27 | /* Target machine header files require this define. */ | |
28 | #define IN_LIBGCC2 | |
29 | ||
30 | #include "auto-host.h" | |
31 | #include "tconfig.h" | |
32 | #include "tsystem.h" | |
33 | #include "coretypes.h" | |
34 | #include "tm.h" | |
022a2799 | 35 | #include "libgcc_tm.h" |
9e51385b | 36 | #include "unwind-dw2-fde.h" |
37 | ||
38 | #define WIN32_LEAN_AND_MEAN | |
39 | #include <windows.h> | |
40 | ||
41 | #ifndef LIBGCC_SONAME | |
42 | #define LIBGCC_SONAME "libgcc_s.dll" | |
43 | #endif | |
44 | ||
45 | #ifndef LIBGCJ_SONAME | |
46 | #define LIBGCJ_SONAME "libgcj_s.dll" | |
47 | #endif | |
48 | ||
bd89d2b6 | 49 | #if DWARF2_UNWIND_INFO |
9e51385b | 50 | /* Make the declarations weak. This is critical for |
51 | _Jv_RegisterClasses because it lives in libgcj.a */ | |
bd89d2b6 | 52 | extern void __register_frame_info (__attribute__((unused)) const void *, |
53 | __attribute__((unused)) struct object *) | |
9e51385b | 54 | TARGET_ATTRIBUTE_WEAK; |
bd89d2b6 | 55 | extern void *__deregister_frame_info (__attribute__((unused)) const void *) |
9e51385b | 56 | TARGET_ATTRIBUTE_WEAK; |
d3c4b980 | 57 | |
58 | /* Work around for current cygwin32 build problems (Bug gas/16858). | |
59 | Compile weak default functions only for 64-bit systems, | |
60 | when absolutely necessary. */ | |
61 | #ifdef __x86_64__ | |
bd89d2b6 | 62 | TARGET_ATTRIBUTE_WEAK void |
63 | __register_frame_info (__attribute__((unused)) const void *p, | |
64 | __attribute__((unused)) struct object *o) | |
65 | { | |
66 | } | |
67 | ||
68 | TARGET_ATTRIBUTE_WEAK void * | |
69 | __deregister_frame_info (__attribute__((unused)) const void *p) | |
70 | { | |
71 | return (void*) 0; | |
72 | } | |
d3c4b980 | 73 | #endif |
bd89d2b6 | 74 | #endif /* DWARF2_UNWIND_INFO */ |
75 | ||
76 | #if TARGET_USE_JCR_SECTION | |
77 | extern void _Jv_RegisterClasses (__attribute__((unused)) const void *) | |
78 | TARGET_ATTRIBUTE_WEAK; | |
79 | ||
d3c4b980 | 80 | #ifdef __x86_64__ |
bd89d2b6 | 81 | TARGET_ATTRIBUTE_WEAK void |
82 | _Jv_RegisterClasses (__attribute__((unused)) const void *p) | |
83 | { | |
84 | } | |
d3c4b980 | 85 | #endif |
bd89d2b6 | 86 | #endif /* TARGET_USE_JCR_SECTION */ |
9e51385b | 87 | |
88 | #if defined(HAVE_LD_RO_RW_SECTION_MIXING) | |
89 | # define EH_FRAME_SECTION_CONST const | |
90 | #else | |
91 | # define EH_FRAME_SECTION_CONST | |
92 | #endif | |
93 | ||
94 | /* Stick a label at the beginning of the frame unwind info so we can | |
95 | register/deregister it with the exception handling library code. */ | |
96 | #if DWARF2_UNWIND_INFO | |
97 | static EH_FRAME_SECTION_CONST char __EH_FRAME_BEGIN__[] | |
325b8c3c | 98 | __attribute__((used, section(__LIBGCC_EH_FRAME_SECTION_NAME__), aligned(4))) |
9e51385b | 99 | = { }; |
100 | ||
101 | static struct object obj; | |
024d645a | 102 | |
103 | /* Handle of libgcc's DLL reference. */ | |
104 | HANDLE hmod_libgcc; | |
827d5daf | 105 | static void * (*deregister_frame_fn) (const void *) = NULL; |
9e51385b | 106 | #endif |
107 | ||
108 | #if TARGET_USE_JCR_SECTION | |
109 | static void *__JCR_LIST__[] | |
325b8c3c | 110 | __attribute__ ((used, section(__LIBGCC_JCR_SECTION_NAME__), aligned(4))) |
9e51385b | 111 | = { }; |
112 | #endif | |
113 | ||
1db4f54b | 114 | #ifdef __CYGWIN__ |
115 | /* Declare the __dso_handle variable. It should have a unique value | |
116 | in every shared-object; in a main program its value is zero. The | |
117 | object should in any case be protected. This means the instance | |
118 | in one DSO or the main program is not used in another object. The | |
119 | dynamic linker takes care of this. */ | |
120 | ||
121 | #ifdef CRTSTUFFS_O | |
122 | extern void *__ImageBase; | |
123 | void *__dso_handle = &__ImageBase; | |
124 | #else | |
125 | void *__dso_handle = 0; | |
126 | #endif | |
127 | ||
128 | #endif /* __CYGWIN__ */ | |
129 | ||
130 | ||
9e51385b | 131 | /* Pull in references from libgcc.a(unwind-dw2-fde.o) in the |
132 | startfile. These are referenced by a ctor and dtor in crtend.o. */ | |
133 | extern void __gcc_register_frame (void); | |
134 | extern void __gcc_deregister_frame (void); | |
135 | ||
136 | void | |
137 | __gcc_register_frame (void) | |
138 | { | |
139 | #if DWARF2_UNWIND_INFO | |
140 | /* Weak undefined symbols won't be pulled in from dlls; hence | |
141 | we first test if the dll is already loaded and, if so, | |
142 | get the symbol's address at run-time. If the dll is not loaded, | |
143 | fallback to weak linkage to static archive. */ | |
144 | ||
145 | void (*register_frame_fn) (const void *, struct object *); | |
146 | HANDLE h = GetModuleHandle (LIBGCC_SONAME); | |
024d645a | 147 | |
9e51385b | 148 | if (h) |
024d645a | 149 | { |
150 | /* Increasing the load-count of LIBGCC_SONAME DLL. */ | |
151 | hmod_libgcc = LoadLibrary (LIBGCC_SONAME); | |
152 | register_frame_fn = (void (*) (const void *, struct object *)) | |
153 | GetProcAddress (h, "__register_frame_info"); | |
2b333d82 | 154 | deregister_frame_fn = (void* (*) (const void *)) |
155 | GetProcAddress (h, "__deregister_frame_info"); | |
156 | } | |
157 | else | |
158 | { | |
159 | register_frame_fn = __register_frame_info; | |
160 | deregister_frame_fn = __deregister_frame_info; | |
024d645a | 161 | } |
9e51385b | 162 | if (register_frame_fn) |
163 | register_frame_fn (__EH_FRAME_BEGIN__, &obj); | |
164 | #endif | |
165 | ||
166 | #if TARGET_USE_JCR_SECTION | |
167 | if (__JCR_LIST__[0]) | |
168 | { | |
169 | void (*register_class_fn) (const void *); | |
170 | HANDLE h = GetModuleHandle (LIBGCJ_SONAME); | |
171 | if (h) | |
172 | register_class_fn = (void (*) (const void *)) | |
173 | GetProcAddress (h, "_Jv_RegisterClasses"); | |
174 | else | |
175 | register_class_fn = _Jv_RegisterClasses; | |
176 | ||
177 | if (register_class_fn) | |
178 | register_class_fn (__JCR_LIST__); | |
179 | } | |
180 | #endif | |
1db4f54b | 181 | |
182 | #if DEFAULT_USE_CXA_ATEXIT | |
183 | /* If we use the __cxa_atexit method to register C++ dtors | |
184 | at object construction, also use atexit to register eh frame | |
185 | info cleanup. */ | |
186 | atexit(__gcc_deregister_frame); | |
187 | #endif /* DEFAULT_USE_CXA_ATEXIT */ | |
9e51385b | 188 | } |
189 | ||
190 | void | |
191 | __gcc_deregister_frame (void) | |
192 | { | |
193 | #if DWARF2_UNWIND_INFO | |
9e51385b | 194 | if (deregister_frame_fn) |
195 | deregister_frame_fn (__EH_FRAME_BEGIN__); | |
024d645a | 196 | if (hmod_libgcc) |
197 | FreeLibrary (hmod_libgcc); | |
9e51385b | 198 | #endif |
199 | } |