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/* 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
cfi_remember_state
cfi_def_cfa_register(%fp)
cfi_window_save
cfi_register(%o7, %i7)
clr %o0
add %sp, 64, %o1
LOADSYSCALL(sigaltstack)
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, %g5, %o0
cmp %o0, %o1
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
cfi_restore_state
.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)
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