1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
|
/* Copyright (C) 2009-2016 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/>. */
/* 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, -208, %sp
cfi_remember_state
cfi_def_cfa_register(%fp)
cfi_window_save
cfi_register(%o7, %i7)
add %fp, 2023, %o1
clr %o0
LOADSYSCALL(sigaltstack)
ta 0x6d
bcs,pn %xcc, .Lok2
lduw [%fp + 2031], %l2
andcc %l2, 0x1, %g0
be,pn %xcc, .Lfail
ldx [%fp + 2023], %l0
ldx [%fp + 2039], %l1
sub %l0, STACK_BIAS, %l0
add %l0, %l1, %l0
sub %l0, %i2, %l0
cmp %l0, %l1
bgeu,pt %xcc, .Lok2
nop
.Lfail:
#ifndef PIC
sethi %hi(longjmp_msg), %o0
or %o0, %lo(longjmp_msg), %o0
#else
SETUP_PIC_REG(l7)
sethi %gdop_hix22(longjmp_msg), %o0
xor %o0, %gdop_lox10(longjmp_msg), %o0
ldx [%l7 + %o0], %o0, %gdop(longjmp_msg)
#endif
call HIDDEN_JUMPTARGET(__fortify_fail)
nop
.Lok2: restore
cfi_restore_state
.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)
|
