1 /* _Unwind_Frames_Extra with shadow stack for x86-64 and x86. 2 Copyright (C) 2017-2018 Free Software Foundation, Inc. 3 4 This file is part of GCC. 5 6 GCC is free software; you can redistribute it and/or modify 7 it under the terms of the GNU General Public License as published by 8 the Free Software Foundation; either version 3, or (at your option) 9 any later version. 10 11 GCC is distributed in the hope that it will be useful, 12 but WITHOUT ANY WARRANTY; without even the implied warranty of 13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 GNU General Public License for more details. 15 16 Under Section 7 of GPL version 3, you are granted additional 17 permissions described in the GCC Runtime Library Exception, version 18 3.1, as published by the Free Software Foundation. 19 20 You should have received a copy of the GNU General Public License and 21 a copy of the GCC Runtime Library Exception along with this program; 22 see the files COPYING3 and COPYING.RUNTIME respectively. If not, see 23 <http://www.gnu.org/licenses/>. */ 24 25 /* NB: We need _get_ssp and _inc_ssp from <cetintrin.h>. But we can't 26 include <x86intrin.h> which ends up including <mm_malloc.h>, which 27 includes <stdlib.h> and <errno.h> unconditionally. But we can't 28 include any libc system headers unconditionally from libgcc. Avoid 29 including <mm_malloc.h> here by defining _IMMINTRIN_H_INCLUDED. */ 30 #define _IMMINTRIN_H_INCLUDED 31 #include <cetintrin.h> 32 #undef _IMMINTRIN_H_INCLUDED 33 34 /* Unwind the shadow stack for EH. */ 35 #undef _Unwind_Frames_Extra 36 #define _Unwind_Frames_Extra(x) \ 37 do \ 38 { \ 39 _Unwind_Word ssp = _get_ssp (); \ 40 if (ssp != 0) \ 41 { \ 42 _Unwind_Word tmp = (x); \ 43 while (tmp > 255) \ 44 { \ 45 _inc_ssp (255); \ 46 tmp -= 255; \ 47 } \ 48 _inc_ssp (tmp); \ 49 } \ 50 } \ 51 while (0) 52