78e49fb1bc
2019-11-06 Jerome Lambourg <lambourg@adacore.com>
Olivier Hainque <hainque@adacore.com>
libgcc/
* config/vxcrtstuff.c: New file.
* config/t-vxcrtstuff: New Makefile fragment.
* config.host: Append t-vxcrtstuff to the tmake_file list
on all VxWorks ports using dwarf for table based EH.
gcc/
* config/vx-common.h (USE_TM_CLONE_REGISTRY): Remove
definition, pointless with a VxWorks specific version
of crtstuff.
(DWARF2_UNWIND_INFO): Conditionalize on !ARM_UNWIND_INFO.
* config/vxworks.h (VX_CRTBEGIN_SPEC, VX_CRTEND_SPEC):
New local macros, controlling the addition of vxworks specific
crtstuff objects depending on the EH mechanism and kind of
module being linked.
(VXWORKS_STARTFILE_SPEC, VXWORKS_ENDFILE_SPEC): Use them.
Co-Authored-By: Olivier Hainque <hainque@adacore.com>
From-SVN: r278248
133 lines
4.5 KiB
C
133 lines
4.5 KiB
C
/* This file is part of GCC.
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GCC is free software; you can redistribute it and/or modify it under
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the terms of the GNU General Public License as published by the Free
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Software Foundation; either version 3, or (at your option) any later
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version.
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GCC is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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for more details.
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Under Section 7 of GPL version 3, you are granted additional
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permissions described in the GCC Runtime Library Exception, version
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3.1, as published by the Free Software Foundation.
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You should have received a copy of the GNU General Public License and
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a copy of the GCC Runtime Library Exception along with this program;
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see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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<http://www.gnu.org/licenses/>. */
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/* The essential point of the crtbegin/crtend files on VxWorks is to handle
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the eh frames registration thanks to dedicated constructors and
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destructors. What needs to be done depends on the VxWorks version and the
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kind of module (rtp, dkm, ...) one is building. */
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#define IN_LIBGCC2
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#include "auto-host.h"
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#include "tconfig.h"
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#include "tsystem.h"
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#include "coretypes.h"
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#include "tm.h"
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#include "libgcc_tm.h"
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#include "unwind-dw2-fde.h"
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/* If we are entitled/requested to use init/fini arrays, we'll rely on that.
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Otherwise, we may rely on ctors/dtors sections for RTPs or expect munch to
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be involved for kernel modules. */
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#if !defined(USE_INIT_FINI_ARRAY) && defined(__RTP__)
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#define USE_CDTORS_SECTIONS
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#endif
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/* ------------------------------ crtbegin ------------------------------- */
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#ifdef CRT_BEGIN
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/* Stick a label at the beginning of the frame unwind info so we can register
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and deregister it with the exception handling library code. */
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static const char __EH_FRAME_BEGIN__[]
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__attribute__((section(__LIBGCC_EH_FRAME_SECTION_NAME__), aligned(4)))
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= { };
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/* Determine what names to use for the constructor/destructor functions. */
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#if defined(USE_CDTORS_SECTIONS) || defined(USE_INITFINI_ARRAY)
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#define EH_CTOR_NAME _crtbe_register_frame
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#define EH_DTOR_NAME _ctrbe_deregister_frame
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#else
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/* No specific sections for constructors or destructors: we thus use a
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symbol naming convention so that the constructors are then recognized
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by munch or whatever tool is used for the final link phase. */
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#define EH_CTOR_NAME _GLOBAL__I_00101_0__crtbe_register_frame
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#define EH_DTOR_NAME _GLOBAL__D_00101_1__crtbe_deregister_frame
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#endif
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#ifdef USE_INITFINI_ARRAY
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/* .init_array and .fini_array is supported starting VxWorks 7.2 in all
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cases. The compiler is then configured to always support priorities in
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constructors, so we can rely on the constructor and destructor attributes
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to generate the proper sections. */
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#define EH_CTOR_ATTRIBUTE __attribute__((constructor (101)))
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#define EH_DTOR_ATTRIBUTE __attribute__((destructor (101)))
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#else /* USE_INITFINI_ARRAY */
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/* Note: Even in case of .ctors/.dtors sections, we can't use the attribute
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(constructor (15)) here as gcc may have been configured with constructors
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priority disabled. We will instead craft an explicit section name for this
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purpose. */
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#define EH_CTOR_ATTRIBUTE
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#define EH_DTOR_ATTRIBUTE
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#endif /* USE_INITFINI_ARRAY */
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void EH_CTOR_NAME (void);
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void EH_DTOR_NAME (void);
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EH_CTOR_ATTRIBUTE void EH_CTOR_NAME (void)
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{
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static struct object object;
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__register_frame_info (__EH_FRAME_BEGIN__, &object);
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}
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EH_DTOR_ATTRIBUTE void EH_DTOR_NAME (void)
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{
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__deregister_frame_info (__EH_FRAME_BEGIN__);
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}
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#ifdef USE_CDTORS_SECTIONS
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/* As explained above, we need to manually build the sections here as the
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compiler may not have support for constructors priority enabled. */
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static void (* volatile eh_registration_ctors[])()
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__attribute__((section (".ctors.101")))
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= { &EH_CTOR_NAME };
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static void (* volatile eh_registration_dtors[])()
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__attribute__((section (".dtors.65434")))
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= { &EH_DTOR_NAME };
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#endif
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/* ------------------------------ crtend --------------------------------- */
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#elif defined (CRT_END) /* ! CRT_BEGIN */
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/* Terminate the frame unwind info section with a 4byte 0 as a sentinel;
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this would be the 'length' field in a real FDE. */
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static const char __FRAME_END__[]
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__attribute__ ((used, section(__LIBGCC_EH_FRAME_SECTION_NAME__),
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aligned(4)))
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= { 0, 0, 0, 0 };
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#else /* ! CRT_BEGIN & ! CRT_END */
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#error "One of CRT_BEGIN or CRT_END must be defined."
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#endif
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