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/* Support for ARM EABI unwinding on VxWorks Downloadable Kernel Modules.
Copyright (C) 2017-2025 Free Software Foundation, Inc.
This file 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.
This file 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/>. */
/* The common unwinding code refers to __gnu_Unwind_Find_exidx and
__cxa_type_match symbols, which are not in VxWorks kernels on ARM,
now llvm based.
While the common code works just fine for RTPs thanks to weak references
and proper positioning of __exidx_start/end from linker scripts, we need
symbol definitions for kernel modules. */
#ifndef __RTP__
#include <private/moduleLibP.h>
/* __gnu_Unwind_Find_exidx. See if we can use _func_moduleExidxGet to
refine whatever we have in __exidx_start and __exidx_end. */
typedef struct
{
UINT32 fnoffset;
UINT32 content;
} __EIT_entry;
extern __EIT_entry __exidx_start;
extern __EIT_entry __exidx_end;
__EIT_entry *
__gnu_Unwind_Find_exidx (void *pc, int *nrec)
{
__EIT_entry *pstart = 0;
__EIT_entry *pend = 0;
if (_func_moduleExidxGet != NULL)
_func_moduleExidxGet (pc,
(void *) &__exidx_start, (void *) &__exidx_end,
(void **) &pstart, (void **) &pend);
if (!pstart)
{
pstart = &__exidx_start;
pend = &__exidx_end;
}
*nrec = pend - pstart;
return pstart;
}
/* __cxa_type_match. A dummy version to be overridden by the libstdc++ one
when we link with it. */
void * __attribute__((weak))
__cxa_type_match ()
{
return (void *) 0;
}
#endif
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