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2c86cff9 TT |
1 | /* DWARF 2 low-level section code |
2 | ||
4a94e368 | 3 | Copyright (C) 1994-2022 Free Software Foundation, Inc. |
2c86cff9 TT |
4 | |
5 | Adapted by Gary Funck (gary@intrepid.com), Intrepid Technology, | |
6 | Inc. with support from Florida State University (under contract | |
7 | with the Ada Joint Program Office), and Silicon Graphics, Inc. | |
8 | Initial contribution by Brent Benson, Harris Computer Systems, Inc., | |
9 | based on Fred Fish's (Cygnus Support) implementation of DWARF 1 | |
10 | support. | |
11 | ||
12 | This file is part of GDB. | |
13 | ||
14 | This program is free software; you can redistribute it and/or modify | |
15 | it under the terms of the GNU General Public License as published by | |
16 | the Free Software Foundation; either version 3 of the License, or | |
17 | (at your option) any later version. | |
18 | ||
19 | This program is distributed in the hope that it will be useful, | |
20 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
21 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
22 | GNU General Public License for more details. | |
23 | ||
24 | You should have received a copy of the GNU General Public License | |
25 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ | |
26 | ||
27 | #include "defs.h" | |
28 | #include "dwarf2/section.h" | |
29 | #include "gdb_bfd.h" | |
30 | #include "objfiles.h" | |
3d27bbdb TT |
31 | #include "complaints.h" |
32 | ||
33 | void | |
a0194fa8 | 34 | dwarf2_section_info::overflow_complaint () const |
3d27bbdb TT |
35 | { |
36 | complaint (_("debug info runs off end of %s section" | |
37 | " [in module %s]"), | |
a0194fa8 | 38 | get_name (), get_file_name ()); |
3d27bbdb | 39 | } |
2c86cff9 TT |
40 | |
41 | struct dwarf2_section_info * | |
96b79293 | 42 | dwarf2_section_info::get_containing_section () const |
2c86cff9 | 43 | { |
96b79293 TT |
44 | gdb_assert (is_virtual); |
45 | return s.containing_section; | |
2c86cff9 TT |
46 | } |
47 | ||
48 | struct bfd * | |
96b79293 | 49 | dwarf2_section_info::get_bfd_owner () const |
2c86cff9 | 50 | { |
96b79293 TT |
51 | const dwarf2_section_info *section = this; |
52 | if (is_virtual) | |
2c86cff9 | 53 | { |
96b79293 | 54 | section = get_containing_section (); |
2c86cff9 TT |
55 | gdb_assert (!section->is_virtual); |
56 | } | |
1fd999d9 | 57 | gdb_assert (section->s.section != nullptr); |
2c86cff9 TT |
58 | return section->s.section->owner; |
59 | } | |
60 | ||
61 | asection * | |
96b79293 | 62 | dwarf2_section_info::get_bfd_section () const |
2c86cff9 | 63 | { |
96b79293 | 64 | const dwarf2_section_info *section = this; |
2c86cff9 TT |
65 | if (section->is_virtual) |
66 | { | |
96b79293 | 67 | section = get_containing_section (); |
2c86cff9 TT |
68 | gdb_assert (!section->is_virtual); |
69 | } | |
70 | return section->s.section; | |
71 | } | |
72 | ||
73 | const char * | |
96b79293 | 74 | dwarf2_section_info::get_name () const |
2c86cff9 | 75 | { |
96b79293 | 76 | asection *sectp = get_bfd_section (); |
2c86cff9 TT |
77 | |
78 | gdb_assert (sectp != NULL); | |
79 | return bfd_section_name (sectp); | |
80 | } | |
81 | ||
82 | const char * | |
96b79293 | 83 | dwarf2_section_info::get_file_name () const |
2c86cff9 | 84 | { |
96b79293 | 85 | bfd *abfd = get_bfd_owner (); |
2c86cff9 | 86 | |
1fd999d9 | 87 | gdb_assert (abfd != nullptr); |
2c86cff9 TT |
88 | return bfd_get_filename (abfd); |
89 | } | |
90 | ||
91 | int | |
96b79293 | 92 | dwarf2_section_info::get_id () const |
2c86cff9 | 93 | { |
96b79293 | 94 | asection *sectp = get_bfd_section (); |
2c86cff9 TT |
95 | |
96 | if (sectp == NULL) | |
97 | return 0; | |
98 | return sectp->id; | |
99 | } | |
100 | ||
101 | int | |
96b79293 | 102 | dwarf2_section_info::get_flags () const |
2c86cff9 | 103 | { |
96b79293 | 104 | asection *sectp = get_bfd_section (); |
2c86cff9 TT |
105 | |
106 | gdb_assert (sectp != NULL); | |
107 | return bfd_section_flags (sectp); | |
108 | } | |
109 | ||
96b79293 TT |
110 | bool |
111 | dwarf2_section_info::empty () const | |
2c86cff9 | 112 | { |
96b79293 TT |
113 | if (is_virtual) |
114 | return size == 0; | |
115 | return s.section == NULL || size == 0; | |
2c86cff9 TT |
116 | } |
117 | ||
118 | void | |
96b79293 | 119 | dwarf2_section_info::read (struct objfile *objfile) |
2c86cff9 TT |
120 | { |
121 | asection *sectp; | |
122 | bfd *abfd; | |
123 | gdb_byte *buf, *retbuf; | |
124 | ||
96b79293 | 125 | if (readin) |
2c86cff9 | 126 | return; |
96b79293 TT |
127 | buffer = NULL; |
128 | readin = true; | |
2c86cff9 | 129 | |
96b79293 | 130 | if (empty ()) |
2c86cff9 TT |
131 | return; |
132 | ||
96b79293 | 133 | sectp = get_bfd_section (); |
2c86cff9 TT |
134 | |
135 | /* If this is a virtual section we need to read in the real one first. */ | |
96b79293 | 136 | if (is_virtual) |
2c86cff9 TT |
137 | { |
138 | struct dwarf2_section_info *containing_section = | |
96b79293 | 139 | get_containing_section (); |
2c86cff9 TT |
140 | |
141 | gdb_assert (sectp != NULL); | |
142 | if ((sectp->flags & SEC_RELOC) != 0) | |
143 | { | |
144 | error (_("Dwarf Error: DWP format V2 with relocations is not" | |
145 | " supported in section %s [in module %s]"), | |
96b79293 | 146 | get_name (), get_file_name ()); |
2c86cff9 | 147 | } |
96b79293 | 148 | containing_section->read (objfile); |
2c86cff9 TT |
149 | /* Other code should have already caught virtual sections that don't |
150 | fit. */ | |
96b79293 | 151 | gdb_assert (virtual_offset + size <= containing_section->size); |
2c86cff9 TT |
152 | /* If the real section is empty or there was a problem reading the |
153 | section we shouldn't get here. */ | |
154 | gdb_assert (containing_section->buffer != NULL); | |
96b79293 | 155 | buffer = containing_section->buffer + virtual_offset; |
2c86cff9 TT |
156 | return; |
157 | } | |
158 | ||
159 | /* If the section has relocations, we must read it ourselves. | |
160 | Otherwise we attach it to the BFD. */ | |
161 | if ((sectp->flags & SEC_RELOC) == 0) | |
162 | { | |
96b79293 | 163 | buffer = gdb_bfd_map_section (sectp, &size); |
2c86cff9 TT |
164 | return; |
165 | } | |
166 | ||
96b79293 TT |
167 | buf = (gdb_byte *) obstack_alloc (&objfile->objfile_obstack, size); |
168 | buffer = buf; | |
2c86cff9 TT |
169 | |
170 | /* When debugging .o files, we may need to apply relocations; see | |
171 | http://sourceware.org/ml/gdb-patches/2002-04/msg00136.html . | |
172 | We never compress sections in .o files, so we only need to | |
173 | try this when the section is not compressed. */ | |
174 | retbuf = symfile_relocate_debug_section (objfile, sectp, buf); | |
175 | if (retbuf != NULL) | |
176 | { | |
96b79293 | 177 | buffer = retbuf; |
2c86cff9 TT |
178 | return; |
179 | } | |
180 | ||
96b79293 | 181 | abfd = get_bfd_owner (); |
2c86cff9 TT |
182 | gdb_assert (abfd != NULL); |
183 | ||
184 | if (bfd_seek (abfd, sectp->filepos, SEEK_SET) != 0 | |
96b79293 | 185 | || bfd_bread (buf, size, abfd) != size) |
2c86cff9 TT |
186 | { |
187 | error (_("Dwarf Error: Can't read DWARF data" | |
188 | " in section %s [in module %s]"), | |
189 | bfd_section_name (sectp), bfd_get_filename (abfd)); | |
190 | } | |
191 | } | |
4f44ae6c TT |
192 | |
193 | const char * | |
194 | dwarf2_section_info::read_string (struct objfile *objfile, LONGEST str_offset, | |
195 | const char *form_name) | |
196 | { | |
197 | read (objfile); | |
198 | if (buffer == NULL) | |
1fd999d9 AB |
199 | { |
200 | if (get_bfd_section () == nullptr) | |
201 | error (_("Dwarf Error: %s used without required section"), | |
202 | form_name); | |
203 | else | |
204 | error (_("Dwarf Error: %s used without %s section [in module %s]"), | |
205 | form_name, get_name (), get_file_name ()); | |
206 | } | |
4f44ae6c TT |
207 | if (str_offset >= size) |
208 | error (_("%s pointing outside of %s section [in module %s]"), | |
209 | form_name, get_name (), get_file_name ()); | |
210 | gdb_assert (HOST_CHAR_BIT == 8); | |
211 | if (buffer[str_offset] == '\0') | |
212 | return NULL; | |
213 | return (const char *) (buffer + str_offset); | |
214 | } |