libgcc/config/arm/unwind-arm.h

   1 /* Header file for the ARM EABI unwinder
   2    Copyright (C) 2003-2019 Free Software Foundation, Inc.
   3    Contributed by Paul Brook
   4
   5    This file is free software; you can redistribute it and/or modify it
   6    under the terms of the GNU General Public License as published by the
   7    Free Software Foundation; either version 3, or (at your option) any
   8    later version.
   9
  10    This file is distributed in the hope that it will be useful, but
  11    WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    General Public License for more details.
  14
  15    Under Section 7 of GPL version 3, you are granted additional
  16    permissions described in the GCC Runtime Library Exception, version
  17    3.1, as published by the Free Software Foundation.
  18
  19    You should have received a copy of the GNU General Public License and
  20    a copy of the GCC Runtime Library Exception along with this program;
  21    see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
  22    <http://www.gnu.org/licenses/>.  */
  23
  24 /* Language-independent unwinder header public defines.  This contains both
  25    ABI defined objects, and GNU support routines.  */
  26
  27 #ifndef UNWIND_ARM_H
  28 #define UNWIND_ARM_H
  29
  30 #include "unwind-arm-common.h"
  31
  32 #define UNWIND_STACK_REG 13
  33 /* Use IP as a scratch register within the personality routine.  */
  34 #define UNWIND_POINTER_REG 12
  35
  36 #ifdef __cplusplus
  37 extern "C" {
  38 #endif
  39   /* Decode an R_ARM_TARGET2 relocation.  */
  40   static inline _Unwind_Word
  41   _Unwind_decode_typeinfo_ptr (_Unwind_Word base __attribute__ ((unused)),
  42                                _Unwind_Word ptr)
  43     {
  44       _Unwind_Word tmp;
  45
  46       tmp = *(_Unwind_Word *) ptr;
  47       /* Zero values are always NULL.  */
  48       if (!tmp)
  49         return 0;
  50
  51 #if (defined(linux) && !defined(__uClinux__)) || defined(__NetBSD__) \
  52     || defined(__FreeBSD__) || defined(__fuchsia__)
  53       /* Pc-relative indirect.  */
  54 #define _GLIBCXX_OVERRIDE_TTYPE_ENCODING (DW_EH_PE_pcrel | DW_EH_PE_indirect)
  55       tmp += ptr;
  56       tmp = *(_Unwind_Word *) tmp;
  57 #elif defined(__symbian__) || defined(__uClinux__)
  58 #define _GLIBCXX_OVERRIDE_TTYPE_ENCODING (DW_EH_PE_absptr)
  59       /* Absolute pointer.  Nothing more to do.  */
  60 #else
  61 #define _GLIBCXX_OVERRIDE_TTYPE_ENCODING (DW_EH_PE_pcrel)
  62       /* Pc-relative pointer.  */
  63       tmp += ptr;
  64 #endif
  65       return tmp;
  66     }
  67
  68   static inline _Unwind_Reason_Code
  69   __gnu_unwind_24bit (_Unwind_Context * context __attribute__ ((unused)),
  70                       _uw data __attribute__ ((unused)),
  71                       int compact __attribute__ ((unused)))
  72     {
  73       return _URC_FAILURE;
  74     }
  75 #ifndef __FreeBSD__
  76   /* Return the address of the instruction, not the actual IP value.  */
  77 #define _Unwind_GetIP(context) \
  78   (_Unwind_GetGR (context, 15) & ~(_Unwind_Word)1)
  79
  80 #define _Unwind_SetIP(context, val) \
  81   _Unwind_SetGR (context, 15, val | (_Unwind_GetGR (context, 15) & 1))
  82 #else
  83   #undef _Unwind_GetIPInfo
  84   _Unwind_Ptr _Unwind_GetIP (struct _Unwind_Context *);
  85   _Unwind_Ptr _Unwind_GetIPInfo (struct _Unwind_Context *, int *);
  86   void _Unwind_SetIP (struct _Unwind_Context *, _Unwind_Ptr);
  87 #endif
  88
  89 #ifdef __cplusplus
  90 }   /* extern "C" */
  91 #endif
  92
  93 #endif /* defined UNWIND_ARM_H */