// Exception handling and frame unwind runtime interface routines.
// Copyright (C) 2011-2022 Free Software Foundation, Inc.

// GCC 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.

// GCC 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/>.

// extern(C) interface for the ARM EABI unwinder library.
// This corresponds to unwind-arm.h

module gcc.unwind.arm;

import gcc.config;

version (ARM):
static if (GNU_ARM_EABI_Unwinder):

public import gcc.unwind.arm_common;
import gcc.unwind.pe;

extern (C):
@nogc:

enum int UNWIND_STACK_REG = 13;
// Use IP as a scratch register within the personality routine.
enum int UNWIND_POINTER_REG = 12;

version (linux)
    enum _TTYPE_ENCODING = (DW_EH_PE_pcrel | DW_EH_PE_indirect);
else version (NetBSD)
    enum _TTYPE_ENCODING = (DW_EH_PE_pcrel | DW_EH_PE_indirect);
else version (FreeBSD)
    enum _TTYPE_ENCODING = (DW_EH_PE_pcrel | DW_EH_PE_indirect);
else version (Symbian)
    enum _TTYPE_ENCODING = (DW_EH_PE_absptr);
else version (uClinux)
    enum _TTYPE_ENCODING = (DW_EH_PE_absptr);
else
    enum _TTYPE_ENCODING = (DW_EH_PE_pcrel);

// Return the address of the instruction, not the actual IP value.
_Unwind_Word _Unwind_GetIP(_Unwind_Context* context)
{
    return _Unwind_GetGR(context, 15) & ~ cast(_Unwind_Word) 1;
}

void _Unwind_SetIP(_Unwind_Context* context, _Unwind_Word val)
{
    return _Unwind_SetGR(context, 15, val | (_Unwind_GetGR(context, 15) & 1));
}

_Unwind_Word _Unwind_GetIPInfo(_Unwind_Context* context, int* ip_before_insn)
{
    *ip_before_insn = 0;
    return _Unwind_GetIP(context);
}