1 /* ppc ABI-specified defaults for DWARF CFI.
2 Copyright (C) 2012, 2013 Red Hat, Inc.
3 This file is part of elfutils.
4
5 This file is free software; you can redistribute it and/or modify
6 it under the terms of either
7
8 * the GNU Lesser General Public License as published by the Free
9 Software Foundation; either version 3 of the License, or (at
10 your option) any later version
11
12 or
13
14 * the GNU General Public License as published by the Free
15 Software Foundation; either version 2 of the License, or (at
16 your option) any later version
17
18 or both in parallel, as here.
19
20 elfutils is distributed in the hope that it will be useful, but
21 WITHOUT ANY WARRANTY; without even the implied warranty of
22 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
23 General Public License for more details.
24
25 You should have received copies of the GNU General Public License and
26 the GNU Lesser General Public License along with this program. If
27 not, see <http://www.gnu.org/licenses/>. */
28
29 #ifdef HAVE_CONFIG_H
30 # include <config.h>
31 #endif
32
33 #include <dwarf.h>
34
35 #define BACKEND ppc_
36 #include "libebl_CPU.h"
37
38 int
ppc_abi_cfi(Ebl * ebl,Dwarf_CIE * abi_info)39 ppc_abi_cfi (Ebl *ebl __attribute__ ((unused)), Dwarf_CIE *abi_info)
40 {
41 static const uint8_t abi_cfi[] =
42 {
43 /* This instruction is provided in every CIE. It is not repeated here:
44 DW_CFA_def_cfa, ULEB128_7 (1), ULEB128_7 (0) */
45 /* r1 is assumed to be restored from cfa address,
46 r1 acts as a stack frame pointer. */
47 DW_CFA_val_offset, ULEB128_7 (1), ULEB128_7 (0),
48 /* lr is not callee-saved but it needs to be preserved as it is pre-set
49 by the caller. */
50 DW_CFA_same_value, ULEB128_7 (65), /* lr */
51
52 /* Callee-saved regs. */
53 #define SV(n) DW_CFA_same_value, ULEB128_7 (n)
54 SV (2), /* r2 is TOC pointer. */
55 SV (13), /* Reserved as system thread id (is it for CFI?). */
56 /* r14-r31 are non-volatile registers. */
57 SV (14), SV (15), SV (16), SV (17), SV (18), SV (19), SV (20), SV (21),
58 SV (22), SV (23), SV (24), SV (25), SV (26), SV (27), SV (28), SV (29),
59 SV (30), SV (31)
60 /* VMX registers v20-v31 and vrsave are non-volatile but they are
61 assigned DWARF registers 1144-1156 (v20-v31) which is outside of the
62 CFI supported range. */
63 #undef SV
64 };
65
66 abi_info->initial_instructions = abi_cfi;
67 abi_info->initial_instructions_end = &abi_cfi[sizeof abi_cfi];
68 abi_info->data_alignment_factor = ebl->class == ELFCLASS64 ? 8 : 4;
69
70 abi_info->return_address_register = 65;
71
72 return 0;
73 }
74
75 __typeof (ppc_abi_cfi)
76 ppc64_abi_cfi
77 __attribute__ ((alias ("ppc_abi_cfi")));
78