libphobos/libdruntime/gcc/unwind/arm.d

   1 // Exception handling and frame unwind runtime interface routines.
   2 // Copyright (C) 2011-2025 Free Software Foundation, Inc.
   3
   4 // GCC is free software; you can redistribute it and/or modify it under
   5 // the terms of the GNU General Public License as published by the Free
   6 // Software Foundation; either version 3, or (at your option) any later
   7 // version.
   8
   9 // GCC is distributed in the hope that it will be useful, but WITHOUT ANY
  10 // WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11 // FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12 // for more details.
  13
  14 // Under Section 7 of GPL version 3, you are granted additional
  15 // permissions described in the GCC Runtime Library Exception, version
  16 // 3.1, as published by the Free Software Foundation.
  17
  18 // You should have received a copy of the GNU General Public License and
  19 // a copy of the GCC Runtime Library Exception along with this program;
  20 // see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
  21 // <http://www.gnu.org/licenses/>.
  22
  23 // extern(C) interface for the ARM EABI unwinder library.
  24 // This corresponds to unwind-arm.h
  25
  26 module gcc.unwind.arm;
  27
  28 import gcc.config;
  29
  30 version (ARM):
  31 static if (GNU_ARM_EABI_Unwinder):
  32
  33 public import gcc.unwind.arm_common;
  34 import gcc.unwind.pe;
  35
  36 extern (C):
  37 @nogc:
  38
  39 enum int UNWIND_STACK_REG = 13;
  40 // Use IP as a scratch register within the personality routine.
  41 enum int UNWIND_POINTER_REG = 12;
  42
  43 version (linux)
  44     enum _TTYPE_ENCODING = (DW_EH_PE_pcrel | DW_EH_PE_indirect);
  45 else version (NetBSD)
  46     enum _TTYPE_ENCODING = (DW_EH_PE_pcrel | DW_EH_PE_indirect);
  47 else version (FreeBSD)
  48     enum _TTYPE_ENCODING = (DW_EH_PE_pcrel | DW_EH_PE_indirect);
  49 else version (Symbian)
  50     enum _TTYPE_ENCODING = (DW_EH_PE_absptr);
  51 else version (uClinux)
  52     enum _TTYPE_ENCODING = (DW_EH_PE_absptr);
  53 else
  54     enum _TTYPE_ENCODING = (DW_EH_PE_pcrel);
  55
  56 // Return the address of the instruction, not the actual IP value.
  57 _Unwind_Word _Unwind_GetIP(_Unwind_Context* context)
  58 {
  59     return _Unwind_GetGR(context, 15) & ~ cast(_Unwind_Word) 1;
  60 }
  61
  62 void _Unwind_SetIP(_Unwind_Context* context, _Unwind_Word val)
  63 {
  64     return _Unwind_SetGR(context, 15, val | (_Unwind_GetGR(context, 15) & 1));
  65 }
  66
  67 _Unwind_Word _Unwind_GetIPInfo(_Unwind_Context* context, int* ip_before_insn)
  68 {
  69     *ip_before_insn = 0;
  70     return _Unwind_GetIP(context);
  71 }