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98 lines
3.2 KiB
C
98 lines
3.2 KiB
C
/* Copyright (C) 2017-2024 Free Software Foundation, Inc.
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Contributed by ARM Ltd.
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This file is part of GCC.
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GCC is free software; you can redistribute it and/or modify it under
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the terms of the GNU General Public License as published by the Free
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Software Foundation; either version 3, or (at your option) any later
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version.
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GCC is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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for more details.
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Under Section 7 of GPL version 3, you are granted additional
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permissions described in the GCC Runtime Library Exception, version
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3.1, as published by the Free Software Foundation.
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You should have received a copy of the GNU General Public License and
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a copy of the GCC Runtime Library Exception along with this program;
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see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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<http://www.gnu.org/licenses/>. */
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#if !defined (AARCH64_UNWIND_H) && !defined (__ILP32__)
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#define AARCH64_UNWIND_H
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#define DWARF_REGNUM_AARCH64_RA_STATE 34
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#define MD_DEMANGLE_RETURN_ADDR(context, fs, addr) \
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aarch64_demangle_return_addr (context, fs, addr)
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static inline int
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aarch64_cie_signed_with_b_key (struct _Unwind_Context *context)
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{
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const struct dwarf_fde *fde = _Unwind_Find_FDE (context->bases.func,
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&context->bases);
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if (fde != NULL)
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{
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const struct dwarf_cie *cie = get_cie (fde);
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if (cie != NULL)
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{
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const unsigned char *aug_str = cie->augmentation;
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return __builtin_strchr ((const char *) aug_str,
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'B') == NULL ? 0 : 1;
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}
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}
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return 0;
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}
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/* Do AArch64 private extraction on ADDR_WORD based on context info CONTEXT and
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unwind frame info FS. If ADDR_WORD is signed, we do address authentication
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on it using CFA of current frame. */
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static inline void *
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aarch64_demangle_return_addr (struct _Unwind_Context *context,
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_Unwind_FrameState *fs,
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_Unwind_Word addr_word)
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{
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void *addr = (void *)addr_word;
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const int reg = DWARF_REGNUM_AARCH64_RA_STATE;
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if (fs->regs.how[reg] == REG_UNSAVED)
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return addr;
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/* Return-address signing state is toggled by DW_CFA_GNU_window_save (where
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REG_UNSAVED/REG_UNSAVED_ARCHEXT means RA signing is disabled/enabled),
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or set by a DW_CFA_expression. */
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if (fs->regs.how[reg] == REG_UNSAVED_ARCHEXT
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|| (_Unwind_GetGR (context, reg) & 0x1) != 0)
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{
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_Unwind_Word salt = (_Unwind_Word) context->cfa;
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if (aarch64_cie_signed_with_b_key (context) != 0)
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return __builtin_aarch64_autib1716 (addr, salt);
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return __builtin_aarch64_autia1716 (addr, salt);
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}
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return addr;
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}
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/* SME runtime function local to libgcc, streaming compatible
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and preserves more registers than the base PCS requires, but
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we don't rely on that here. */
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__attribute__ ((visibility ("hidden")))
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void __libgcc_arm_za_disable (void);
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/* Disable the SME ZA state in case an unwound frame used the ZA
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lazy saving scheme. */
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#undef _Unwind_Frames_Extra
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#define _Unwind_Frames_Extra(x) \
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do \
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{ \
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__libgcc_arm_za_disable (); \
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} \
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while (0)
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#endif /* defined AARCH64_UNWIND_H && defined __ILP32__ */
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