| /* Copyright (C) 2017-2021 Free Software Foundation, Inc. |
| Contributed by ARM Ltd. |
| |
| This file is part of GCC. |
| |
| 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/>. */ |
| |
| #if !defined (AARCH64_UNWIND_H) && !defined (__ILP32__) |
| #define AARCH64_UNWIND_H |
| |
| #define DWARF_REGNUM_AARCH64_RA_STATE 34 |
| |
| #define MD_DEMANGLE_RETURN_ADDR(context, fs, addr) \ |
| aarch64_demangle_return_addr (context, fs, addr) |
| #define MD_FROB_UPDATE_CONTEXT(context, fs) \ |
| aarch64_frob_update_context (context, fs) |
| |
| static inline int |
| aarch64_cie_signed_with_b_key (struct _Unwind_Context *context) |
| { |
| const struct dwarf_fde *fde = _Unwind_Find_FDE (context->bases.func, |
| &context->bases); |
| if (fde != NULL) |
| { |
| const struct dwarf_cie *cie = get_cie (fde); |
| if (cie != NULL) |
| { |
| char *aug_str = cie->augmentation; |
| return strchr (aug_str, 'B') == NULL ? 0 : 1; |
| } |
| } |
| return 0; |
| } |
| |
| /* Do AArch64 private extraction on ADDR_WORD based on context info CONTEXT and |
| unwind frame info FS. If ADDR_WORD is signed, we do address authentication |
| on it using CFA of current frame. */ |
| |
| static inline void * |
| aarch64_demangle_return_addr (struct _Unwind_Context *context, |
| _Unwind_FrameState *fs ATTRIBUTE_UNUSED, |
| _Unwind_Word addr_word) |
| { |
| void *addr = (void *)addr_word; |
| if (context->flags & RA_SIGNED_BIT) |
| { |
| _Unwind_Word salt = (_Unwind_Word) context->cfa; |
| if (aarch64_cie_signed_with_b_key (context) != 0) |
| return __builtin_aarch64_autib1716 (addr, salt); |
| return __builtin_aarch64_autia1716 (addr, salt); |
| } |
| else |
| return addr; |
| } |
| |
| /* Do AArch64 private initialization on CONTEXT based on frame info FS. Mark |
| CONTEXT as return address signed if bit 0 of DWARF_REGNUM_AARCH64_RA_STATE is |
| set. */ |
| |
| static inline void |
| aarch64_frob_update_context (struct _Unwind_Context *context, |
| _Unwind_FrameState *fs) |
| { |
| if (fs->regs.reg[DWARF_REGNUM_AARCH64_RA_STATE].loc.offset & 0x1) |
| /* The flag is used for re-authenticating EH handler's address. */ |
| context->flags |= RA_SIGNED_BIT; |
| else |
| context->flags &= ~RA_SIGNED_BIT; |
| |
| return; |
| } |
| |
| #endif /* defined AARCH64_UNWIND_H && defined __ILP32__ */ |