cygming-crtbegin.c revision 1.1
1 1.1 mrg /* crtbegin object for windows32 targets. 2 1.1 mrg Copyright (C) 2007-2013 Free Software Foundation, Inc. 3 1.1 mrg 4 1.1 mrg Contributed by Danny Smith <dannysmith (at) users.sourceforge.net> 5 1.1 mrg 6 1.1 mrg This file is part of GCC. 7 1.1 mrg 8 1.1 mrg GCC is free software; you can redistribute it and/or modify it under 9 1.1 mrg the terms of the GNU General Public License as published by the Free 10 1.1 mrg Software Foundation; either version 3, or (at your option) any later 11 1.1 mrg version. 12 1.1 mrg 13 1.1 mrg GCC is distributed in the hope that it will be useful, but WITHOUT ANY 14 1.1 mrg WARRANTY; without even the implied warranty of MERCHANTABILITY or 15 1.1 mrg FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 16 1.1 mrg for more details. 17 1.1 mrg 18 1.1 mrg Under Section 7 of GPL version 3, you are granted additional 19 1.1 mrg permissions described in the GCC Runtime Library Exception, version 20 1.1 mrg 3.1, as published by the Free Software Foundation. 21 1.1 mrg 22 1.1 mrg You should have received a copy of the GNU General Public License and 23 1.1 mrg a copy of the GCC Runtime Library Exception along with this program; 24 1.1 mrg see the files COPYING3 and COPYING.RUNTIME respectively. If not, see 25 1.1 mrg <http://www.gnu.org/licenses/>. */ 26 1.1 mrg 27 1.1 mrg /* Target machine header files require this define. */ 28 1.1 mrg #define IN_LIBGCC2 29 1.1 mrg 30 1.1 mrg #include "auto-host.h" 31 1.1 mrg #include "tconfig.h" 32 1.1 mrg #include "tsystem.h" 33 1.1 mrg #include "coretypes.h" 34 1.1 mrg #include "tm.h" 35 1.1 mrg #include "libgcc_tm.h" 36 1.1 mrg #include "unwind-dw2-fde.h" 37 1.1 mrg 38 1.1 mrg #define WIN32_LEAN_AND_MEAN 39 1.1 mrg #include <windows.h> 40 1.1 mrg 41 1.1 mrg #ifndef LIBGCC_SONAME 42 1.1 mrg #define LIBGCC_SONAME "libgcc_s.dll" 43 1.1 mrg #endif 44 1.1 mrg 45 1.1 mrg #ifndef LIBGCJ_SONAME 46 1.1 mrg #define LIBGCJ_SONAME "libgcj_s.dll" 47 1.1 mrg #endif 48 1.1 mrg 49 1.1 mrg 50 1.1 mrg /* Make the declarations weak. This is critical for 51 1.1 mrg _Jv_RegisterClasses because it lives in libgcj.a */ 52 1.1 mrg extern void __register_frame_info (const void *, struct object *) 53 1.1 mrg TARGET_ATTRIBUTE_WEAK; 54 1.1 mrg extern void *__deregister_frame_info (const void *) 55 1.1 mrg TARGET_ATTRIBUTE_WEAK; 56 1.1 mrg extern void _Jv_RegisterClasses (const void *) TARGET_ATTRIBUTE_WEAK; 57 1.1 mrg 58 1.1 mrg #if defined(HAVE_LD_RO_RW_SECTION_MIXING) 59 1.1 mrg # define EH_FRAME_SECTION_CONST const 60 1.1 mrg #else 61 1.1 mrg # define EH_FRAME_SECTION_CONST 62 1.1 mrg #endif 63 1.1 mrg 64 1.1 mrg /* Stick a label at the beginning of the frame unwind info so we can 65 1.1 mrg register/deregister it with the exception handling library code. */ 66 1.1 mrg #if DWARF2_UNWIND_INFO 67 1.1 mrg static EH_FRAME_SECTION_CONST char __EH_FRAME_BEGIN__[] 68 1.1 mrg __attribute__((used, section(EH_FRAME_SECTION_NAME), aligned(4))) 69 1.1 mrg = { }; 70 1.1 mrg 71 1.1 mrg static struct object obj; 72 1.1 mrg 73 1.1 mrg /* Handle of libgcc's DLL reference. */ 74 1.1 mrg HANDLE hmod_libgcc; 75 1.1 mrg #endif 76 1.1 mrg 77 1.1 mrg #if TARGET_USE_JCR_SECTION 78 1.1 mrg static void *__JCR_LIST__[] 79 1.1 mrg __attribute__ ((used, section(JCR_SECTION_NAME), aligned(4))) 80 1.1 mrg = { }; 81 1.1 mrg #endif 82 1.1 mrg 83 1.1 mrg /* Pull in references from libgcc.a(unwind-dw2-fde.o) in the 84 1.1 mrg startfile. These are referenced by a ctor and dtor in crtend.o. */ 85 1.1 mrg extern void __gcc_register_frame (void); 86 1.1 mrg extern void __gcc_deregister_frame (void); 87 1.1 mrg 88 1.1 mrg void 89 1.1 mrg __gcc_register_frame (void) 90 1.1 mrg { 91 1.1 mrg #if DWARF2_UNWIND_INFO 92 1.1 mrg /* Weak undefined symbols won't be pulled in from dlls; hence 93 1.1 mrg we first test if the dll is already loaded and, if so, 94 1.1 mrg get the symbol's address at run-time. If the dll is not loaded, 95 1.1 mrg fallback to weak linkage to static archive. */ 96 1.1 mrg 97 1.1 mrg void (*register_frame_fn) (const void *, struct object *); 98 1.1 mrg HANDLE h = GetModuleHandle (LIBGCC_SONAME); 99 1.1 mrg 100 1.1 mrg if (h) 101 1.1 mrg { 102 1.1 mrg /* Increasing the load-count of LIBGCC_SONAME DLL. */ 103 1.1 mrg hmod_libgcc = LoadLibrary (LIBGCC_SONAME); 104 1.1 mrg register_frame_fn = (void (*) (const void *, struct object *)) 105 1.1 mrg GetProcAddress (h, "__register_frame_info"); 106 1.1 mrg } 107 1.1 mrg else 108 1.1 mrg register_frame_fn = __register_frame_info; 109 1.1 mrg if (register_frame_fn) 110 1.1 mrg register_frame_fn (__EH_FRAME_BEGIN__, &obj); 111 1.1 mrg #endif 112 1.1 mrg 113 1.1 mrg #if TARGET_USE_JCR_SECTION 114 1.1 mrg if (__JCR_LIST__[0]) 115 1.1 mrg { 116 1.1 mrg void (*register_class_fn) (const void *); 117 1.1 mrg HANDLE h = GetModuleHandle (LIBGCJ_SONAME); 118 1.1 mrg if (h) 119 1.1 mrg register_class_fn = (void (*) (const void *)) 120 1.1 mrg GetProcAddress (h, "_Jv_RegisterClasses"); 121 1.1 mrg else 122 1.1 mrg register_class_fn = _Jv_RegisterClasses; 123 1.1 mrg 124 1.1 mrg if (register_class_fn) 125 1.1 mrg register_class_fn (__JCR_LIST__); 126 1.1 mrg } 127 1.1 mrg #endif 128 1.1 mrg } 129 1.1 mrg 130 1.1 mrg void 131 1.1 mrg __gcc_deregister_frame (void) 132 1.1 mrg { 133 1.1 mrg #if DWARF2_UNWIND_INFO 134 1.1 mrg void * (*deregister_frame_fn) (const void *); 135 1.1 mrg HANDLE h = GetModuleHandle (LIBGCC_SONAME); 136 1.1 mrg if (h) 137 1.1 mrg deregister_frame_fn = (void* (*) (const void *)) 138 1.1 mrg GetProcAddress (h, "__deregister_frame_info"); 139 1.1 mrg else 140 1.1 mrg deregister_frame_fn = __deregister_frame_info; 141 1.1 mrg if (deregister_frame_fn) 142 1.1 mrg deregister_frame_fn (__EH_FRAME_BEGIN__); 143 1.1 mrg if (hmod_libgcc) 144 1.1 mrg FreeLibrary (hmod_libgcc); 145 1.1 mrg #endif 146 1.1 mrg } 147
Indexes created Sun Mar 01 05:31:48 UTC 2026