| /* Copyright (C) 2009 Free Software Foundation, Inc. |
| This file is part of the GNU C Library. |
| Contributed by Jakub Jelinek <jakub@redhat.com>. |
| |
| The GNU C Library is free software; you can redistribute it and/or |
| modify it under the terms of the GNU Lesser General Public |
| License as published by the Free Software Foundation; either |
| version 2.1 of the License, or (at your option) any later version. |
| |
| The GNU C Library 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 |
| Lesser General Public License for more details. |
| |
| You should have received a copy of the GNU Lesser General Public |
| License along with the GNU C Library; if not, write to the Free |
| Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA |
| 02111-1307 USA. */ |
| |
| #include <errno.h> |
| #include <sysdep.h> |
| #include <setjmp.h> |
| #include <bits/setjmp.h> |
| #include <stdlib.h> |
| #include <unistd.h> |
| #include <stdio.h> |
| #include <stdint.h> |
| #include <signal.h> |
| #include <sys/syscall.h> |
| |
| #define __longjmp ____longjmp_chk |
| |
| #define CHECK_SP(env, guard) \ |
| do \ |
| { \ |
| uintptr_t cur_sp; \ |
| uintptr_t new_sp = env->__gregs[9]; \ |
| __asm ("lr %0, %%r15" : "=r" (cur_sp)); \ |
| new_sp ^= guard; \ |
| if (new_sp < cur_sp) \ |
| { \ |
| stack_t oss; \ |
| INTERNAL_SYSCALL_DECL (err); \ |
| int res = INTERNAL_SYSCALL (sigaltstack, err, 2, NULL, &oss); \ |
| if (!INTERNAL_SYSCALL_ERROR_P (res, err)) \ |
| { \ |
| if ((oss.ss_flags & SS_ONSTACK) == 0 \ |
| || ((uintptr_t) (oss.ss_sp + oss.ss_size) - new_sp \ |
| < oss.ss_size)) \ |
| __fortify_fail ("longjmp causes uninitialized stack frame");\ |
| } \ |
| } \ |
| } while (0) |
| |
| #include "__longjmp.c" |
