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1 : : /* arm ABI-specified defaults for DWARF CFI.
2 : : Copyright (C) 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 arm_
36 : : #include "libebl_CPU.h"
37 : :
38 : :
39 : : /* ABI-specified state of DWARF CFI based on:
40 : :
41 : : "DWARF for the ARM Architecture ABI r2.09"
42 : : http://infocenter.arm.com/help/topic/com.arm.doc.ihi0040b/IHI0040B_aadwarf.pdf
43 : :
44 : : "Procedure Call Standard for the ARM Architecture ABI r2.09"
45 : : http://infocenter.arm.com/help/topic/com.arm.doc.ihi0042e/IHI0042E_aapcs.pdf
46 : : */
47 : :
48 : : int
49 : 4 : arm_abi_cfi (Ebl *ebl __attribute__ ((unused)), Dwarf_CIE *abi_info)
50 : : {
51 : 4 : static const uint8_t abi_cfi[] =
52 : : {
53 : : /* The initial Canonical Frame Address is the value of the
54 : : Stack Pointer (r13) as setup in the previous frame. */
55 : : DW_CFA_def_cfa, ULEB128_7 (13), ULEB128_7 (0),
56 : :
57 : : /* The Stack Pointer (r13) is restored from CFA address by default. */
58 : : DW_CFA_val_offset, ULEB128_7 (13), ULEB128_7 (0),
59 : :
60 : : #define SV(n) DW_CFA_same_value, ULEB128_7 (n)
61 : : /* Callee-saved regs r4-r8, r10, r11. */
62 : : SV (4), SV (5), SV (6), SV (7), SV (8), SV (10), SV (11),
63 : :
64 : : /* The link register contains the return address setup by caller. */
65 : : SV (14),
66 : : DW_CFA_register, ULEB128_7 (15), ULEB128_7 (14), /* pc = lr */
67 : : #undef SV
68 : :
69 : : /* VFP S16-S31/D8-D15/Q4-Q7 are callee saved.
70 : : And uleb128 encoded with two bytes. */
71 : : #define ULEB128_8_2(x) ((x & 0x7f) | 0x80), 0x02
72 : : #define SV(n) DW_CFA_same_value, ULEB128_8_2 (n)
73 : : SV (264), SV (265), SV (266), SV (267),
74 : : SV (268), SV (269), SV (270), SV (271),
75 : :
76 : : /* XXX Note: registers intentionally unused by the program,
77 : : for example as a consequence of the procedure call standard
78 : : should be initialized as if by DW_CFA_same_value. */
79 : : };
80 : : #undef ULEB128_8_2
81 : : #undef SV
82 : :
83 : 4 : abi_info->initial_instructions = abi_cfi;
84 : 4 : abi_info->initial_instructions_end = &abi_cfi[sizeof abi_cfi];
85 : 4 : abi_info->data_alignment_factor = 4;
86 : :
87 : 4 : abi_info->return_address_register = 15; /* pc. */
88 : :
89 : 4 : return 0;
90 : : }
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