79 lines
2.3 KiB
C
79 lines
2.3 KiB
C
/* Support for ARM EABI unwinding on VxWorks Downloadable Kernel Modules.
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Copyright (C) 2017-2020 Free Software Foundation, Inc.
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This file is free software; you can redistribute it and/or modify it
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under the terms of the GNU General Public License as published by the
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Free Software Foundation; either version 3, or (at your option) any
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later version.
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This file is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License 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 common unwinding code refers to __gnu_Unwind_Find_exidx and
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__cxa_type_match symbols, which are not in VxWorks kernels on ARM,
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now llvm based.
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While the common code works just fine for RTPs thanks to weak references
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and proper positioning of __exidx_start/end from linker scripts, we need
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symbol definitions for kernel modules. */
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#ifndef __RTP__
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#include <private/moduleLibP.h>
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/* __gnu_Unwind_Find_exidx. See if we can use _func_moduleExidxGet to
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refine whatever we have in __exidx_start and __exidx_end. */
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typedef struct
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{
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UINT32 fnoffset;
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UINT32 content;
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} __EIT_entry;
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extern __EIT_entry __exidx_start;
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extern __EIT_entry __exidx_end;
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__EIT_entry *
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__gnu_Unwind_Find_exidx (void *pc, int *nrec)
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{
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__EIT_entry *pstart = 0;
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__EIT_entry *pend = 0;
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if (_func_moduleExidxGet != NULL)
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_func_moduleExidxGet (pc,
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(void *) &__exidx_start, (void *) &__exidx_end,
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(void **) &pstart, (void **) &pend);
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if (!pstart)
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{
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pstart = &__exidx_start;
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pend = &__exidx_end;
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}
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*nrec = pend - pstart;
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return pstart;
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}
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/* __cxa_type_match. A dummy version to be overridden by the libstdc++ one
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when we link with it. */
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void * __attribute__((weak))
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__cxa_type_match ()
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{
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return (void *) 0;
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}
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#endif
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