Retro68/gcc/libgcc/config/aarch64/aarch64-unwind.h
2017-10-07 02:16:47 +02:00

88 lines
3.1 KiB
C

/* Copyright (C) 2017 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)
/* 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 (fs->regs.reg[DWARF_REGNUM_AARCH64_RA_STATE].loc.offset & 0x1)
{
_Unwind_Word salt = (_Unwind_Word) context->cfa;
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_A_SIGNED_BIT)
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_A_SIGNED_BIT;
return;
}
#endif /* defined AARCH64_UNWIND_H && defined __ILP32__ */