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
|
/* DWARF2 EH unwinding support for AIX.
Copyright (C) 2011 Free Software Foundation, Inc.
This file is part of GCC.
GCC is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3, or (at your option)
any later version.
GCC 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 General Public
License for more details.
Under Section 7 of GPL version 3, you are granted additional
permissions described in the GCC Runtime Library Exception, version
3.1, as published by the Free Software Foundation.
You should have received a copy of the GNU General Public License and
a copy of the GCC Runtime Library Exception along with this program;
see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
<http://www.gnu.org/licenses/>. */
/* If the current unwind info (FS) does not contain explicit info
saving R2, then we have to do a minor amount of code reading to
figure out if it was saved. The big problem here is that the
code that does the save/restore is generated by the linker, so
we have no good way to determine at compile time what to do. */
#define R_LR 65
#ifdef __64BIT__
#define MD_FROB_UPDATE_CONTEXT(CTX, FS) \
do { \
if ((FS)->regs.reg[2].how == REG_UNSAVED) \
{ \
unsigned int *insn \
= (unsigned int *) \
_Unwind_GetGR ((CTX), R_LR); \
if (*insn == 0xE8410028) \
_Unwind_SetGRPtr ((CTX), 2, (CTX)->cfa + 40); \
} \
} while (0)
#else
#define MD_FROB_UPDATE_CONTEXT(CTX, FS) \
do { \
if ((FS)->regs.reg[2].how == REG_UNSAVED) \
{ \
unsigned int *insn \
= (unsigned int *) \
_Unwind_GetGR ((CTX), R_LR); \
if (*insn == 0x80410014) \
_Unwind_SetGRPtr ((CTX), 2, (CTX)->cfa + 20); \
} \
} while (0)
#endif
|
