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/* Header file for the ARM EABI unwinder
Copyright (C) 2003-2022 Free Software Foundation, Inc.
Contributed by Paul Brook
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/>. */
/* Language-independent unwinder header public defines. This contains both
ABI defined objects, and GNU support routines. */
#ifndef UNWIND_ARM_H
#define UNWIND_ARM_H
#include "unwind-arm-common.h"
#define UNWIND_STACK_REG 13
/* Use IP as a scratch register within the personality routine. */
#define UNWIND_POINTER_REG 12
#define FDPIC_REGNUM 9
#define STR(x) #x
#define XSTR(x) STR(x)
#ifdef __cplusplus
extern "C" {
#endif
_Unwind_Ptr __attribute__((weak)) __gnu_Unwind_Find_got (_Unwind_Ptr);
static inline _Unwind_Ptr _Unwind_gnu_Find_got (_Unwind_Ptr ptr)
{
_Unwind_Ptr res;
if (__gnu_Unwind_Find_got)
res = __gnu_Unwind_Find_got (ptr);
else
__asm volatile ("mov %[result], r" XSTR(FDPIC_REGNUM)
: [result] "=r" (res));
return res;
}
/* Decode an R_ARM_TARGET2 relocation. */
static inline _Unwind_Word
_Unwind_decode_typeinfo_ptr (_Unwind_Word base __attribute__ ((unused)),
_Unwind_Word ptr)
{
_Unwind_Word tmp;
tmp = *(_Unwind_Word *) ptr;
/* Zero values are always NULL. */
if (!tmp)
return 0;
#if __FDPIC__
/* For FDPIC, we store the offset of the GOT entry. */
/* So, first get GOT from dynamic linker and then use indirect access. */
tmp += _Unwind_gnu_Find_got (ptr);
tmp = *(_Unwind_Word *) tmp;
#elif (defined(linux) && !defined(__uClinux__)) || defined(__NetBSD__) \
|| defined(__FreeBSD__) || defined(__fuchsia__)
/* Pc-relative indirect. */
#define _GLIBCXX_OVERRIDE_TTYPE_ENCODING (DW_EH_PE_pcrel | DW_EH_PE_indirect)
tmp += ptr;
tmp = *(_Unwind_Word *) tmp;
#elif defined(__symbian__) || defined(__uClinux__)
#define _GLIBCXX_OVERRIDE_TTYPE_ENCODING (DW_EH_PE_absptr)
/* Absolute pointer. Nothing more to do. */
#else
#define _GLIBCXX_OVERRIDE_TTYPE_ENCODING (DW_EH_PE_pcrel)
/* Pc-relative pointer. */
tmp += ptr;
#endif
return tmp;
}
static inline _Unwind_Reason_Code
__gnu_unwind_24bit (_Unwind_Context * context __attribute__ ((unused)),
_uw data __attribute__ ((unused)),
int compact __attribute__ ((unused)))
{
return _URC_FAILURE;
}
#ifndef __FreeBSD__
/* Return the address of the instruction, not the actual IP value. */
#define _Unwind_GetIP(context) \
(_Unwind_GetGR (context, 15) & ~(_Unwind_Word)1)
#define _Unwind_SetIP(context, val) \
_Unwind_SetGR (context, 15, val | (_Unwind_GetGR (context, 15) & 1))
#else
#undef _Unwind_GetIPInfo
_Unwind_Ptr _Unwind_GetIP (struct _Unwind_Context *);
_Unwind_Ptr _Unwind_GetIPInfo (struct _Unwind_Context *, int *);
void _Unwind_SetIP (struct _Unwind_Context *, _Unwind_Ptr);
#endif
#ifdef __cplusplus
} /* extern "C" */
#endif
#endif /* defined UNWIND_ARM_H */
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