diff options
Diffstat (limited to 'libgcc/config/i386/shadow-stack-unwind.h')
| -rw-r--r-- | libgcc/config/i386/shadow-stack-unwind.h | 51 |
1 files changed, 51 insertions, 0 deletions
diff --git a/libgcc/config/i386/shadow-stack-unwind.h b/libgcc/config/i386/shadow-stack-unwind.h new file mode 100644 index 00000000000..2789e894130 --- /dev/null +++ b/libgcc/config/i386/shadow-stack-unwind.h @@ -0,0 +1,51 @@ +/* _Unwind_Frames_Extra with shadow stack for x86-64 and x86. + Copyright (C) 2017 Free Software Foundation, Inc. + +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/>. */ + +#ifdef __x86_64__ +# define incssp(x) __builtin_ia32_incsspq ((x)) +# define rdssp(x) __builtin_ia32_rdsspq (x) +#else +# define incssp(x) __builtin_ia32_incsspd ((x)) +# define rdssp(x) __builtin_ia32_rdsspd (x) +#endif + +/* Unwind the shadow stack for EH. */ +#undef _Unwind_Frames_Extra +#define _Unwind_Frames_Extra(x) \ + do \ + { \ + unsigned long ssp = 0; \ + ssp = rdssp (ssp); \ + if (ssp != 0) \ + { \ + unsigned long tmp = (x); \ + while (tmp > 255) \ + { \ + incssp (tmp); \ + tmp -= 255; \ + } \ + incssp (tmp); \ + } \ + } \ + while (0) |