1 /* Common interface for libebl modules.
2 Copyright (C) 2000, 2001, 2002, 2003, 2005, 2013, 2014 Red Hat, Inc.
3 Copyright (C) 2023 Mark J. Wielaard <[email protected]>
4 This file is part of elfutils.
5
6 This file is free software; you can redistribute it and/or modify
7 it under the terms of either
8
9 * the GNU Lesser General Public License as published by the Free
10 Software Foundation; either version 3 of the License, or (at
11 your option) any later version
12
13 or
14
15 * the GNU General Public License as published by the Free
16 Software Foundation; either version 2 of the License, or (at
17 your option) any later version
18
19 or both in parallel, as here.
20
21 elfutils is distributed in the hope that it will be useful, but
22 WITHOUT ANY WARRANTY; without even the implied warranty of
23 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
24 General Public License for more details.
25
26 You should have received copies of the GNU General Public License and
27 the GNU Lesser General Public License along with this program. If
28 not, see <http://www.gnu.org/licenses/>. */
29
30 #ifndef _LIBEBL_CPU_H
31 #define _LIBEBL_CPU_H 1
32
33 #include <dwarf.h>
34 #include <libeblP.h>
35
36 #define EBLHOOK(name) EBLHOOK_1(BACKEND, name)
37 #define EBLHOOK_1(a, b) EBLHOOK_2(a, b)
38 #define EBLHOOK_2(a, b) a##b
39
40 /* Constructor. */
41 extern Ebl *EBLHOOK(init) (Elf *elf, GElf_Half machine, Ebl *eh);
42
43 #include "ebl-hooks.h"
44
45 #define HOOK(eh, name) eh->name = EBLHOOK(name)
46
47 extern bool (*generic_debugscn_p) (const char *) attribute_hidden;
48
49 /* Helper for retval. Return dwarf_tag (die), but calls return -1
50 if there where previous errors that leave die NULL. */
51 #define DWARF_TAG_OR_RETURN(die) \
52 ({ Dwarf_Die *_die = (die); \
53 if (_die == NULL) return -1; \
54 dwarf_tag (_die); })
55
56 /* Get a type die corresponding to DIE. Peel CV qualifiers off
57 it. Returns zero if the DIE doesn't have a type, or the type
58 is DW_TAG_unspecified_type. Returns -1 on error. Otherwise
59 returns the result tag DW_AT value. */
60 static inline int
dwarf_peeled_die_type(Dwarf_Die * die,Dwarf_Die * result)61 dwarf_peeled_die_type (Dwarf_Die *die, Dwarf_Die *result)
62 {
63 Dwarf_Attribute attr_mem;
64 Dwarf_Attribute *attr = dwarf_attr_integrate (die, DW_AT_type, &attr_mem);
65 if (attr == NULL)
66 /* The function has no return value, like a `void' function in C. */
67 return 0;
68
69 if (result == NULL)
70 return -1;
71
72 if (dwarf_formref_die (attr, result) == NULL)
73 return -1;
74
75 if (dwarf_peel_type (result, result) != 0)
76 return -1;
77
78 int tag = dwarf_tag (result);
79 if (tag == DW_TAG_unspecified_type)
80 return 0; /* Treat an unspecified type as if there was no type. */
81
82 return tag;
83 }
84
85 static inline bool
dwarf_is_pointer(int tag)86 dwarf_is_pointer (int tag)
87 {
88 return tag == DW_TAG_pointer_type
89 || tag == DW_TAG_ptr_to_member_type
90 || tag == DW_TAG_reference_type
91 || tag == DW_TAG_rvalue_reference_type;
92 }
93
94 #define CASE_POINTER \
95 case DW_TAG_pointer_type: \
96 case DW_TAG_ptr_to_member_type: \
97 case DW_TAG_reference_type: \
98 case DW_TAG_rvalue_reference_type
99
100 #endif /* libebl_CPU.h */
101