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/* crtbegin object for windows32 targets.
Copyright (C) 2007-2014 Free Software Foundation, Inc.
Contributed by Danny Smith <dannysmith@users.sourceforge.net>
This file is part of GCC.
GCC is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free
Software Foundation; either version 3, or (at your option) any later
version.
GCC is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
for more details.
Under Section 7 of GPL version 3, you are granted additional
permissions described in the GCC Runtime Library Exception, version
3.1, as published by the Free Software Foundation.
You should have received a copy of the GNU General Public License and
a copy of the GCC Runtime Library Exception along with this program;
see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
<http://www.gnu.org/licenses/>. */
/* Target machine header files require this define. */
#define IN_LIBGCC2
#include "auto-host.h"
#include "tconfig.h"
#include "tsystem.h"
#include "coretypes.h"
#include "tm.h"
#include "libgcc_tm.h"
#include "unwind-dw2-fde.h"
#define WIN32_LEAN_AND_MEAN
#include <windows.h>
#ifndef LIBGCC_SONAME
#define LIBGCC_SONAME "libgcc_s.dll"
#endif
#ifndef LIBGCJ_SONAME
#define LIBGCJ_SONAME "libgcj_s.dll"
#endif
#if DWARF2_UNWIND_INFO
/* Make the declarations weak. This is critical for
_Jv_RegisterClasses because it lives in libgcj.a */
extern void __register_frame_info (__attribute__((unused)) const void *,
__attribute__((unused)) struct object *)
TARGET_ATTRIBUTE_WEAK;
extern void *__deregister_frame_info (__attribute__((unused)) const void *)
TARGET_ATTRIBUTE_WEAK;
/* Work around for current cygwin32 build problems (Bug gas/16858).
Compile weak default functions only for 64-bit systems,
when absolutely necessary. */
#ifdef __x86_64__
TARGET_ATTRIBUTE_WEAK void
__register_frame_info (__attribute__((unused)) const void *p,
__attribute__((unused)) struct object *o)
{
}
TARGET_ATTRIBUTE_WEAK void *
__deregister_frame_info (__attribute__((unused)) const void *p)
{
return (void*) 0;
}
#endif
#endif /* DWARF2_UNWIND_INFO */
#if TARGET_USE_JCR_SECTION
extern void _Jv_RegisterClasses (__attribute__((unused)) const void *)
TARGET_ATTRIBUTE_WEAK;
#ifdef __x86_64__
TARGET_ATTRIBUTE_WEAK void
_Jv_RegisterClasses (__attribute__((unused)) const void *p)
{
}
#endif
#endif /* TARGET_USE_JCR_SECTION */
#if defined(HAVE_LD_RO_RW_SECTION_MIXING)
# define EH_FRAME_SECTION_CONST const
#else
# define EH_FRAME_SECTION_CONST
#endif
/* Stick a label at the beginning of the frame unwind info so we can
register/deregister it with the exception handling library code. */
#if DWARF2_UNWIND_INFO
static EH_FRAME_SECTION_CONST char __EH_FRAME_BEGIN__[]
__attribute__((used, section(EH_FRAME_SECTION_NAME), aligned(4)))
= { };
static struct object obj;
/* Handle of libgcc's DLL reference. */
HANDLE hmod_libgcc;
static void * (*deregister_frame_fn) (const void *) = NULL;
#endif
#if TARGET_USE_JCR_SECTION
static void *__JCR_LIST__[]
__attribute__ ((used, section(JCR_SECTION_NAME), aligned(4)))
= { };
#endif
/* Pull in references from libgcc.a(unwind-dw2-fde.o) in the
startfile. These are referenced by a ctor and dtor in crtend.o. */
extern void __gcc_register_frame (void);
extern void __gcc_deregister_frame (void);
void
__gcc_register_frame (void)
{
#if DWARF2_UNWIND_INFO
/* Weak undefined symbols won't be pulled in from dlls; hence
we first test if the dll is already loaded and, if so,
get the symbol's address at run-time. If the dll is not loaded,
fallback to weak linkage to static archive. */
void (*register_frame_fn) (const void *, struct object *);
HANDLE h = GetModuleHandle (LIBGCC_SONAME);
if (h)
{
/* Increasing the load-count of LIBGCC_SONAME DLL. */
hmod_libgcc = LoadLibrary (LIBGCC_SONAME);
register_frame_fn = (void (*) (const void *, struct object *))
GetProcAddress (h, "__register_frame_info");
deregister_frame_fn = (void* (*) (const void *))
GetProcAddress (h, "__deregister_frame_info");
}
else
{
register_frame_fn = __register_frame_info;
deregister_frame_fn = __deregister_frame_info;
}
if (register_frame_fn)
register_frame_fn (__EH_FRAME_BEGIN__, &obj);
#endif
#if TARGET_USE_JCR_SECTION
if (__JCR_LIST__[0])
{
void (*register_class_fn) (const void *);
HANDLE h = GetModuleHandle (LIBGCJ_SONAME);
if (h)
register_class_fn = (void (*) (const void *))
GetProcAddress (h, "_Jv_RegisterClasses");
else
register_class_fn = _Jv_RegisterClasses;
if (register_class_fn)
register_class_fn (__JCR_LIST__);
}
#endif
}
void
__gcc_deregister_frame (void)
{
#if DWARF2_UNWIND_INFO
if (deregister_frame_fn)
deregister_frame_fn (__EH_FRAME_BEGIN__);
if (hmod_libgcc)
FreeLibrary (hmod_libgcc);
#endif
}
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