1// Exception handling and frame unwind runtime interface routines.
2// Copyright (C) 2011-2020 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
26module gcc.unwind.arm;
27
28import gcc.config;
29
30version (ARM):
31static if (GNU_ARM_EABI_Unwinder):
32
33public import gcc.unwind.arm_common;
34import gcc.unwind.pe;
35
36extern (C):
37@nogc:
38
39enum int UNWIND_STACK_REG = 13;
40// Use IP as a scratch register within the personality routine.
41enum int UNWIND_POINTER_REG = 12;
42
43version (linux)
44    enum _TTYPE_ENCODING = (DW_EH_PE_pcrel | DW_EH_PE_indirect);
45else version (NetBSD)
46    enum _TTYPE_ENCODING = (DW_EH_PE_pcrel | DW_EH_PE_indirect);
47else version (FreeBSD)
48    enum _TTYPE_ENCODING = (DW_EH_PE_pcrel | DW_EH_PE_indirect);
49else version (Symbian)
50    enum _TTYPE_ENCODING = (DW_EH_PE_absptr);
51else version (uClinux)
52    enum _TTYPE_ENCODING = (DW_EH_PE_absptr);
53else
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
62void _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}
72