diff options
Diffstat (limited to 'sysdeps/arm/nacl/____longjmp_chk.S')
| -rw-r--r-- | sysdeps/arm/nacl/____longjmp_chk.S | 47 |
1 files changed, 47 insertions, 0 deletions
diff --git a/sysdeps/arm/nacl/____longjmp_chk.S b/sysdeps/arm/nacl/____longjmp_chk.S new file mode 100644 index 0000000000..f950f17d7b --- /dev/null +++ b/sysdeps/arm/nacl/____longjmp_chk.S @@ -0,0 +1,47 @@ +/* longjmp that validates stack addresses. ARM/NaCl version. + Copyright (C) 2015 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + 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, see + <http://www.gnu.org/licenses/>. */ + +#include <sysdep.h> + + .section .rodata.str1.1,"aMS",%progbits,1 + .type longjmp_msg,%object +longjmp_msg: + .string "longjmp causes uninitialized stack frame" + .size longjmp_msg, .-longjmp_msg + + .text + +/* We don't have sigaltstack and so any longjmp must be to an outer frame. */ +.macro check_sp reg + cmp sp, \reg + bls .Lok +#ifdef PIC + movw r0, #:lower16:longjmp_msg-(.LPIC0+8) + movt r0, #:upper16:longjmp_msg-(.LPIC0+8) +.LPIC0: add r0, r0, pc +#else + movw r0, #:lower16:longjmp_msg + movt r0, #:upper16:longjmp_msg +#endif + b HIDDEN_JUMPTARGET(__fortify_fail) +.Lok: +.endm + +#define CHECK_SP(reg) check_sp reg +#define __longjmp ____longjmp_chk +#include <__longjmp.S> |