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1 : : /* arm64 ABI-specified defaults for DWARF CFI.
2 : : Copyright (C) 2013, 2018 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 aarch64_
36 : : #include "libebl_CPU.h"
37 : :
38 : :
39 : : /* ABI-specified state of DWARF CFI based on:
40 : :
41 : : "DWARF for the ARM 64 bit architecture (AArch64) 1.0"
42 : : http://infocenter.arm.com/help/topic/com.arm.doc.ihi0057b/IHI0057B_aadwarf64.pdf
43 : :
44 : : "Procedure Call Standard for the ARM 64 bit Architecture 1.0"
45 : : http://infocenter.arm.com/help/topic/com.arm.doc.ihi0055b/IHI0055B_aapcs64.pdf
46 : : */
47 : :
48 : : int
49 : 16 : aarch64_abi_cfi (Ebl *ebl __attribute__ ((unused)), Dwarf_CIE *abi_info)
50 : : {
51 : 16 : static const uint8_t abi_cfi[] =
52 : : {
53 : : /* The initial Canonical Frame Address is the value of the
54 : : Stack Pointer (r31) as setup in the previous frame. */
55 : : DW_CFA_def_cfa, ULEB128_7 (30), ULEB128_7 (0),
56 : :
57 : : #define SV(n) DW_CFA_same_value, ULEB128_7 (n)
58 : : /* Callee-saved regs r19-r28. */
59 : : SV (19), SV (20), SV (21), SV (22), SV (23),
60 : : SV (24), SV (25), SV (26), SV (27), SV (28),
61 : :
62 : : /* The Frame Pointer (FP, r29) and Link Register (LR, r30). */
63 : : SV (29), SV (30),
64 : :
65 : : /* The Stack Pointer (r31) is restored from CFA address by default. */
66 : : DW_CFA_val_offset, ULEB128_7 (31), ULEB128_7 (0),
67 : :
68 : : /* Callee-saved fpregs v8-v15. v0 == 64. */
69 : : SV (72), SV (73), SV (74), SV (75),
70 : : SV (76), SV (77), SV (78), SV (79),
71 : : #undef SV
72 : :
73 : : /* XXX Note: registers intentionally unused by the program,
74 : : for example as a consequence of the procedure call standard
75 : : should be initialized as if by DW_CFA_same_value. */
76 : : };
77 : :
78 : 16 : abi_info->initial_instructions = abi_cfi;
79 : 16 : abi_info->initial_instructions_end = &abi_cfi[sizeof abi_cfi];
80 : 16 : abi_info->data_alignment_factor = -4;
81 : :
82 : 16 : abi_info->return_address_register = 30; /* lr. */
83 : :
84 : 16 : return 0;
85 : : }
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