diff options
Diffstat (limited to 'sysdeps/unix/sysv/linux/sparc/sparc64/____longjmp_chk.S')
-rw-r--r-- | sysdeps/unix/sysv/linux/sparc/sparc64/____longjmp_chk.S | 71 |
1 files changed, 71 insertions, 0 deletions
diff --git a/sysdeps/unix/sysv/linux/sparc/sparc64/____longjmp_chk.S b/sysdeps/unix/sysv/linux/sparc/sparc64/____longjmp_chk.S new file mode 100644 index 0000000000..9a4c8fe3b9 --- /dev/null +++ b/sysdeps/unix/sysv/linux/sparc/sparc64/____longjmp_chk.S @@ -0,0 +1,71 @@ +/* Copyright (C) 2009 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, write to the Free + Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA + 02111-1307 USA. */ + +/* longjmp is implemented in terms of the setcontext trap on Linux/Sparc64. */ + +#include <sysdep.h> + +/* Offsets into the jmp_buf structure. */ + +#define O_mask_was_saved 512 +#define O_gregs 32 +#define O_g1 (O_gregs + 4*8) +#define O_sp (O_gregs + 17*8) + +.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 +ENTRY (____longjmp_chk) + ldx [%o0 + O_sp], %o2 + cmp %sp, %o2 + bleu,pt %xcc, .Lok + nop + + save %sp, -128, %sp + +#ifdef PIC +1: call 2f + sethi %hi(_GLOBAL_OFFSET_TABLE_-(1b-.)), %l7 +2: or %l7, %lo(_GLOBAL_OFFSET_TABLE_-(1b-.)), %l7 + add %l7, %o7, %l7 +#endif + sethi %hi(longjmp_msg), %o0 + or %o0, %lo(longjmp_msg), %o0 +#ifdef PIC + ldx [%l7 + %o0], %o0 +#endif + call HIDDEN_JUMPTARGET(__fortify_fail) + nop + + restore + +.Lok: + /* Modify the context with the value we want to return. */ + movre %o1, 1, %o1 + stx %o1, [%o0 + O_g1] + + /* Let setcontext know if we want to modify the current sigmask. */ + ld [%o0 + O_mask_was_saved], %o1 + + /* And bamf back to where we belong! */ + ta 0x6f +END(____longjmp_chk) |