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2c86cff9 TT |
1 | /* DWARF 2 low-level section code |
2 | ||
3 | Copyright (C) 1994-2020 Free Software Foundation, Inc. | |
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 | } | |
57 | return section->s.section->owner; | |
58 | } | |
59 | ||
60 | asection * | |
96b79293 | 61 | dwarf2_section_info::get_bfd_section () const |
2c86cff9 | 62 | { |
96b79293 | 63 | const dwarf2_section_info *section = this; |
2c86cff9 TT |
64 | if (section->is_virtual) |
65 | { | |
96b79293 | 66 | section = get_containing_section (); |
2c86cff9 TT |
67 | gdb_assert (!section->is_virtual); |
68 | } | |
69 | return section->s.section; | |
70 | } | |
71 | ||
72 | const char * | |
96b79293 | 73 | dwarf2_section_info::get_name () const |
2c86cff9 | 74 | { |
96b79293 | 75 | asection *sectp = get_bfd_section (); |
2c86cff9 TT |
76 | |
77 | gdb_assert (sectp != NULL); | |
78 | return bfd_section_name (sectp); | |
79 | } | |
80 | ||
81 | const char * | |
96b79293 | 82 | dwarf2_section_info::get_file_name () const |
2c86cff9 | 83 | { |
96b79293 | 84 | bfd *abfd = get_bfd_owner (); |
2c86cff9 TT |
85 | |
86 | return bfd_get_filename (abfd); | |
87 | } | |
88 | ||
89 | int | |
96b79293 | 90 | dwarf2_section_info::get_id () const |
2c86cff9 | 91 | { |
96b79293 | 92 | asection *sectp = get_bfd_section (); |
2c86cff9 TT |
93 | |
94 | if (sectp == NULL) | |
95 | return 0; | |
96 | return sectp->id; | |
97 | } | |
98 | ||
99 | int | |
96b79293 | 100 | dwarf2_section_info::get_flags () const |
2c86cff9 | 101 | { |
96b79293 | 102 | asection *sectp = get_bfd_section (); |
2c86cff9 TT |
103 | |
104 | gdb_assert (sectp != NULL); | |
105 | return bfd_section_flags (sectp); | |
106 | } | |
107 | ||
96b79293 TT |
108 | bool |
109 | dwarf2_section_info::empty () const | |
2c86cff9 | 110 | { |
96b79293 TT |
111 | if (is_virtual) |
112 | return size == 0; | |
113 | return s.section == NULL || size == 0; | |
2c86cff9 TT |
114 | } |
115 | ||
116 | void | |
96b79293 | 117 | dwarf2_section_info::read (struct objfile *objfile) |
2c86cff9 TT |
118 | { |
119 | asection *sectp; | |
120 | bfd *abfd; | |
121 | gdb_byte *buf, *retbuf; | |
122 | ||
96b79293 | 123 | if (readin) |
2c86cff9 | 124 | return; |
96b79293 TT |
125 | buffer = NULL; |
126 | readin = true; | |
2c86cff9 | 127 | |
96b79293 | 128 | if (empty ()) |
2c86cff9 TT |
129 | return; |
130 | ||
96b79293 | 131 | sectp = get_bfd_section (); |
2c86cff9 TT |
132 | |
133 | /* If this is a virtual section we need to read in the real one first. */ | |
96b79293 | 134 | if (is_virtual) |
2c86cff9 TT |
135 | { |
136 | struct dwarf2_section_info *containing_section = | |
96b79293 | 137 | get_containing_section (); |
2c86cff9 TT |
138 | |
139 | gdb_assert (sectp != NULL); | |
140 | if ((sectp->flags & SEC_RELOC) != 0) | |
141 | { | |
142 | error (_("Dwarf Error: DWP format V2 with relocations is not" | |
143 | " supported in section %s [in module %s]"), | |
96b79293 | 144 | get_name (), get_file_name ()); |
2c86cff9 | 145 | } |
96b79293 | 146 | containing_section->read (objfile); |
2c86cff9 TT |
147 | /* Other code should have already caught virtual sections that don't |
148 | fit. */ | |
96b79293 | 149 | gdb_assert (virtual_offset + size <= containing_section->size); |
2c86cff9 TT |
150 | /* If the real section is empty or there was a problem reading the |
151 | section we shouldn't get here. */ | |
152 | gdb_assert (containing_section->buffer != NULL); | |
96b79293 | 153 | buffer = containing_section->buffer + virtual_offset; |
2c86cff9 TT |
154 | return; |
155 | } | |
156 | ||
157 | /* If the section has relocations, we must read it ourselves. | |
158 | Otherwise we attach it to the BFD. */ | |
159 | if ((sectp->flags & SEC_RELOC) == 0) | |
160 | { | |
96b79293 | 161 | buffer = gdb_bfd_map_section (sectp, &size); |
2c86cff9 TT |
162 | return; |
163 | } | |
164 | ||
96b79293 TT |
165 | buf = (gdb_byte *) obstack_alloc (&objfile->objfile_obstack, size); |
166 | buffer = buf; | |
2c86cff9 TT |
167 | |
168 | /* When debugging .o files, we may need to apply relocations; see | |
169 | http://sourceware.org/ml/gdb-patches/2002-04/msg00136.html . | |
170 | We never compress sections in .o files, so we only need to | |
171 | try this when the section is not compressed. */ | |
172 | retbuf = symfile_relocate_debug_section (objfile, sectp, buf); | |
173 | if (retbuf != NULL) | |
174 | { | |
96b79293 | 175 | buffer = retbuf; |
2c86cff9 TT |
176 | return; |
177 | } | |
178 | ||
96b79293 | 179 | abfd = get_bfd_owner (); |
2c86cff9 TT |
180 | gdb_assert (abfd != NULL); |
181 | ||
182 | if (bfd_seek (abfd, sectp->filepos, SEEK_SET) != 0 | |
96b79293 | 183 | || bfd_bread (buf, size, abfd) != size) |
2c86cff9 TT |
184 | { |
185 | error (_("Dwarf Error: Can't read DWARF data" | |
186 | " in section %s [in module %s]"), | |
187 | bfd_section_name (sectp), bfd_get_filename (abfd)); | |
188 | } | |
189 | } | |
4f44ae6c TT |
190 | |
191 | const char * | |
192 | dwarf2_section_info::read_string (struct objfile *objfile, LONGEST str_offset, | |
193 | const char *form_name) | |
194 | { | |
195 | read (objfile); | |
196 | if (buffer == NULL) | |
197 | error (_("%s used without %s section [in module %s]"), | |
198 | form_name, get_name (), get_file_name ()); | |
199 | if (str_offset >= size) | |
200 | error (_("%s pointing outside of %s section [in module %s]"), | |
201 | form_name, get_name (), get_file_name ()); | |
202 | gdb_assert (HOST_CHAR_BIT == 8); | |
203 | if (buffer[str_offset] == '\0') | |
204 | return NULL; | |
205 | return (const char *) (buffer + str_offset); | |
206 | } |