diff options
Diffstat (limited to 'sysdeps/unix/sysv/linux/sparc/sparc32/____longjmp_chk.S')
| -rw-r--r-- | sysdeps/unix/sysv/linux/sparc/sparc32/____longjmp_chk.S | 113 |
1 files changed, 113 insertions, 0 deletions
diff --git a/sysdeps/unix/sysv/linux/sparc/sparc32/____longjmp_chk.S b/sysdeps/unix/sysv/linux/sparc/sparc32/____longjmp_chk.S new file mode 100644 index 0000000000..0ecd7ddf83 --- /dev/null +++ b/sysdeps/unix/sysv/linux/sparc/sparc32/____longjmp_chk.S @@ -0,0 +1,113 @@ +/* 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. */ + +#include <sysdep.h> +#include <jmpbuf-offsets.h> + +#define ENV(base,reg) [%base + (reg * 4)] +#define ST_FLUSH_WINDOWS 3 +#define RW_FP [%fp + 0x48] + +.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) + ld ENV(o0,JB_SP), %g5 +#ifdef PTR_DEMANGLE + PTR_DEMANGLE (%g5, %g5, %g4) +#endif + + cmp %sp, %g5 + bleu .Lok_norestore + nop + + save %sp, -80, %sp + + clr %o0 + add %sp, 64, %o1 + set __NR_sigaltstack, %g1 + ta 0x10 + bcs .Lok + ld [%sp + 64 + 4], %o2 + andcc %o2, 0x1, %g0 + be .Lfail + ld [%sp + 64 + 0], %o0 + + ld [%sp + 64 + 8], %o1 + add %o0, %o1, %o0 + sub %o0, %g3, %o0 + cmp %o1, %o0 + bgeu .Lok + nop + +.Lfail: +#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 + ld [%l7 + %o0], %o0 +#endif + call HIDDEN_JUMPTARGET(__fortify_fail) + nop + +.Lok: + restore + +.Lok_norestore: + ld ENV(o0,JB_FP), %g3 /* Cache target FP in register %g3. */ +#ifdef PTR_DEMANGLE + PTR_DEMANGLE2 (%g3, %g3, %g4) +#endif + + mov %o0, %g1 /* ENV in %g1 */ + orcc %o1, %g0, %g2 /* VAL in %g2 */ + be,a 0f /* Branch if zero; else skip delay slot. */ + mov 1, %g2 /* Delay slot only hit if zero: VAL = 1. */ +0: + + /* + * Do a "flush register windows trap". The trap handler in the + * kernel writes all the register windows to their stack slots, and + * marks them all as invalid (needing to be sucked up from the + * stack when used). This ensures that all information needed to + * unwind to these callers is in memory, not in the register + * windows. + */ + ta ST_FLUSH_WINDOWS +#ifdef PTR_DEMANGLE + ld ENV(g1,JB_PC), %g1 /* Set return PC. */ + PTR_DEMANGLE2 (%o7, %g1, %g4) +#else + ld ENV(g1,JB_PC), %o7 /* Set return PC. */ +#endif + mov %g5, %fp + sub %fp, 64, %sp /* Allocate a register frame. */ + st %g3, RW_FP /* Set saved FP on restore below. */ + retl + restore %g2, 0, %o0 /* Restore values from above register frame. */ + +END(____longjmp_chk) |