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52 lines
1.8 KiB
C
52 lines
1.8 KiB
C
/* _Unwind_Frames_Extra with shadow stack for x86-64 and x86.
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Copyright (C) 2017-2019 Free Software Foundation, Inc.
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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
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3, or (at your option)
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any later version.
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GCC is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License 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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/* NB: We need _get_ssp and _inc_ssp from <cetintrin.h>. But we can't
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include <x86intrin.h> which ends up including <mm_malloc.h>, which
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includes <stdlib.h> and <errno.h> unconditionally. But we can't
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include any libc system headers unconditionally from libgcc. Avoid
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including <mm_malloc.h> here by defining _IMMINTRIN_H_INCLUDED. */
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#define _IMMINTRIN_H_INCLUDED
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#include <cetintrin.h>
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#undef _IMMINTRIN_H_INCLUDED
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/* Unwind the shadow stack for EH. */
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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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_Unwind_Word ssp = _get_ssp (); \
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if (ssp != 0) \
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{ \
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_Unwind_Word tmp = (x); \
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while (tmp > 255) \
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{ \
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_inc_ssp (255); \
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tmp -= 255; \
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} \
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_inc_ssp (tmp); \
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} \
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} \
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while (0)
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