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1 /* crtbegin object for windows32 targets.
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2 Copyright (C) 2007, 2009 Free Software Foundation, Inc.
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3
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4 Contributed by Danny Smith <dannysmith@users.sourceforge.net>
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5
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6 This file is part of GCC.
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7
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8 GCC is free software; you can redistribute it and/or modify it under
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9 the terms of the GNU General Public License as published by the Free
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10 Software Foundation; either version 3, or (at your option) any later
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11 version.
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12
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13 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
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14 WARRANTY; without even the implied warranty of MERCHANTABILITY or
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15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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16 for more details.
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17
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18 Under Section 7 of GPL version 3, you are granted additional
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19 permissions described in the GCC Runtime Library Exception, version
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20 3.1, as published by the Free Software Foundation.
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21
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22 You should have received a copy of the GNU General Public License and
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23 a copy of the GCC Runtime Library Exception along with this program;
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24 see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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25 <http://www.gnu.org/licenses/>. */
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26
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27 /* Target machine header files require this define. */
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28 #define IN_LIBGCC2
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29
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30 #include "auto-host.h"
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31 #include "tconfig.h"
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32 #include "tsystem.h"
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33 #include "coretypes.h"
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34 #include "tm.h"
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35 #include "unwind-dw2-fde.h"
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36
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37 #define WIN32_LEAN_AND_MEAN
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38 #include <windows.h>
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39
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40 #ifndef LIBGCC_SONAME
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41 #define LIBGCC_SONAME "libgcc_s.dll"
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42 #endif
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43
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44 #ifndef LIBGCJ_SONAME
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45 #define LIBGCJ_SONAME "libgcj_s.dll"
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46 #endif
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47
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48
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49 /* Make the declarations weak. This is critical for
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50 _Jv_RegisterClasses because it lives in libgcj.a */
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51 extern void __register_frame_info (const void *, struct object *)
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52 TARGET_ATTRIBUTE_WEAK;
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53 extern void *__deregister_frame_info (const void *)
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54 TARGET_ATTRIBUTE_WEAK;
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55 extern void _Jv_RegisterClasses (const void *) TARGET_ATTRIBUTE_WEAK;
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56
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57 #if defined(HAVE_LD_RO_RW_SECTION_MIXING)
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58 # define EH_FRAME_SECTION_CONST const
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59 #else
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60 # define EH_FRAME_SECTION_CONST
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61 #endif
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62
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63 /* Stick a label at the beginning of the frame unwind info so we can
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64 register/deregister it with the exception handling library code. */
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65 #if DWARF2_UNWIND_INFO
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66 static EH_FRAME_SECTION_CONST char __EH_FRAME_BEGIN__[]
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67 __attribute__((section(EH_FRAME_SECTION_NAME), aligned(4)))
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68 = { };
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69
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70 static struct object obj;
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71 #endif
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72
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73 #if TARGET_USE_JCR_SECTION
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74 static void *__JCR_LIST__[]
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75 __attribute__ ((unused, section(JCR_SECTION_NAME), aligned(4)))
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76 = { };
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77 #endif
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78
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79 /* Pull in references from libgcc.a(unwind-dw2-fde.o) in the
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80 startfile. These are referenced by a ctor and dtor in crtend.o. */
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81 extern void __gcc_register_frame (void);
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82 extern void __gcc_deregister_frame (void);
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83
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84 void
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85 __gcc_register_frame (void)
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86 {
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87 #if DWARF2_UNWIND_INFO
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88 /* Weak undefined symbols won't be pulled in from dlls; hence
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89 we first test if the dll is already loaded and, if so,
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90 get the symbol's address at run-time. If the dll is not loaded,
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91 fallback to weak linkage to static archive. */
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92
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93 void (*register_frame_fn) (const void *, struct object *);
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94 HANDLE h = GetModuleHandle (LIBGCC_SONAME);
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95 if (h)
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96 register_frame_fn = (void (*) (const void *, struct object *))
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97 GetProcAddress (h, "__register_frame_info");
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98 else
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99 register_frame_fn = __register_frame_info;
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100 if (register_frame_fn)
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101 register_frame_fn (__EH_FRAME_BEGIN__, &obj);
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102 #endif
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103
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104 #if TARGET_USE_JCR_SECTION
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105 if (__JCR_LIST__[0])
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106 {
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107 void (*register_class_fn) (const void *);
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108 HANDLE h = GetModuleHandle (LIBGCJ_SONAME);
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109 if (h)
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110 register_class_fn = (void (*) (const void *))
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111 GetProcAddress (h, "_Jv_RegisterClasses");
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112 else
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113 register_class_fn = _Jv_RegisterClasses;
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114
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115 if (register_class_fn)
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116 register_class_fn (__JCR_LIST__);
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117 }
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118 #endif
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119 }
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120
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121 void
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122 __gcc_deregister_frame (void)
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123 {
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124 #if DWARF2_UNWIND_INFO
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125 void * (*deregister_frame_fn) (const void *);
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126 HANDLE h = GetModuleHandle (LIBGCC_SONAME);
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127 if (h)
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128 deregister_frame_fn = (void* (*) (const void *))
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129 GetProcAddress (h, "__deregister_frame_info");
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130 else
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131 deregister_frame_fn = __deregister_frame_info;
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132 if (deregister_frame_fn)
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133 deregister_frame_fn (__EH_FRAME_BEGIN__);
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134 #endif
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135 }
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