Mercurial > hg > CbC > CbC_gcc
view libgcc/config/aarch64/aarch64-unwind.h @ 158:494b0b89df80 default tip
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author | Shinji KONO <kono@ie.u-ryukyu.ac.jp> |
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date | Mon, 25 May 2020 18:13:55 +0900 |
parents | 1830386684a0 |
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/* Copyright (C) 2017-2020 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_POST_EXTRACT_ROOT_ADDR(addr) __builtin_aarch64_xpaclri (addr) #define MD_POST_EXTRACT_FRAME_ADDR(context, fs, addr) \ aarch64_post_extract_frame_addr (context, fs, addr) #define MD_POST_FROB_EH_HANDLER_ADDR(current, target, addr) \ aarch64_post_frob_eh_handler_addr (current, target, 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 based on context info CONTEXT and unwind frame info FS. If ADDR is signed, we do address authentication on it using CFA of current frame. */ static inline void * aarch64_post_extract_frame_addr (struct _Unwind_Context *context, _Unwind_FrameState *fs, void *addr) { 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 frob on exception handler's address HANDLER_ADDR before installing it into current context CURRENT. TARGET is currently not used. We need to sign exception handler's address if CURRENT itself is signed. */ static inline void * aarch64_post_frob_eh_handler_addr (struct _Unwind_Context *current, struct _Unwind_Context *target ATTRIBUTE_UNUSED, void *handler_addr) { if (current->flags & RA_SIGNED_BIT) { if (aarch64_cie_signed_with_b_key (current)) return __builtin_aarch64_pacib1716 (handler_addr, (_Unwind_Word) current->cfa); return __builtin_aarch64_pacia1716 (handler_addr, (_Unwind_Word) current->cfa); } else return handler_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; return; } #endif /* defined AARCH64_UNWIND_H && defined __ILP32__ */