value-unwind.h revision 1.1.1.4
1/* Store register values as _Unwind_Word type in DWARF2 EH unwind context. 2 Copyright (C) 2017-2018 Free Software Foundation, Inc. 3 4 This file is part of GCC. 5 6 GCC is free software; you can redistribute it and/or modify it 7 under the terms of the GNU General Public License as published 8 by the Free Software Foundation; either version 3, or (at your 9 option) any later version. 10 11 GCC is distributed in the hope that it will be useful, but WITHOUT 12 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY 13 or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public 14 License for more details. 15 16 You should have received a copy of the GNU General Public License and 17 a copy of the GCC Runtime Library Exception along with this program; 18 see the files COPYING3 and COPYING.RUNTIME respectively. If not, see 19 <http://www.gnu.org/licenses/>. */ 20 21/* Define this macro if the target stores register values as _Unwind_Word 22 type in unwind context. Only enable it for ilp32. */ 23#if defined __aarch64__ && !defined __LP64__ 24# define REG_VALUE_IN_UNWIND_CONTEXT 25#endif 26 27/* Return the value of the pseudo VG register. This should only be 28 called if we know this is an SVE host. */ 29static inline int 30aarch64_vg (void) 31{ 32 register int vg asm ("x0"); 33 /* CNTD X0. */ 34 asm (".inst 0x04e0e3e0" : "=r" (vg)); 35 return vg; 36} 37 38/* Lazily provide a value for VG, so that we don't try to execute SVE 39 instructions unless we know they're needed. */ 40#define DWARF_LAZY_REGISTER_VALUE(REGNO, VALUE) \ 41 ((REGNO) == AARCH64_DWARF_VG && ((*VALUE) = aarch64_vg (), 1)) 42