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e1c14599 ILT |
1 | /* rddbg.c -- Read debugging information into a generic form. |
2 | Copyright (C) 1995 Free Software Foundation, Inc. | |
3 | Written by Ian Lance Taylor <ian@cygnus.com>. | |
4 | ||
5 | This file is part of GNU Binutils. | |
6 | ||
7 | This program is free software; you can redistribute it and/or modify | |
8 | it under the terms of the GNU General Public License as published by | |
9 | the Free Software Foundation; either version 2 of the License, or | |
10 | (at your option) any later version. | |
11 | ||
12 | This program is distributed in the hope that it will be useful, | |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | GNU General Public License for more details. | |
16 | ||
17 | You should have received a copy of the GNU General Public License | |
18 | along with this program; if not, write to the Free Software | |
19 | Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA | |
20 | 02111-1307, USA. */ | |
21 | ||
22 | /* This file reads debugging information into a generic form. This | |
23 | file knows how to dig the debugging information out of an object | |
24 | file. */ | |
25 | ||
26 | #include "bfd.h" | |
27 | #include "bucomm.h" | |
28 | #include "libiberty.h" | |
29 | #include "debug.h" | |
30 | #include "budbg.h" | |
31 | ||
32 | static boolean read_section_stabs_debugging_info | |
33 | PARAMS ((bfd *, PTR, boolean *)); | |
34 | ||
35 | /* Read debugging information from a BFD. Returns a generic debugging | |
36 | pointer. */ | |
37 | ||
38 | PTR | |
39 | read_debugging_info (abfd) | |
40 | bfd *abfd; | |
41 | { | |
42 | PTR dhandle; | |
43 | boolean found; | |
44 | ||
45 | dhandle = debug_init (); | |
46 | if (dhandle == NULL) | |
47 | return NULL; | |
48 | ||
49 | /* All we know about right now is stabs in sections. */ | |
50 | ||
51 | if (! read_section_stabs_debugging_info (abfd, dhandle, &found)) | |
52 | return NULL; | |
53 | ||
54 | if (! found) | |
55 | { | |
56 | fprintf (stderr, "%s: no recognized debugging information\n", | |
57 | bfd_get_filename (abfd)); | |
58 | return NULL; | |
59 | } | |
60 | ||
61 | return dhandle; | |
62 | } | |
63 | ||
64 | /* Read stabs in sections debugging information from a BFD. */ | |
65 | ||
66 | static boolean | |
67 | read_section_stabs_debugging_info (abfd, dhandle, pfound) | |
68 | bfd *abfd; | |
69 | PTR dhandle; | |
70 | boolean *pfound; | |
71 | { | |
72 | static struct | |
73 | { | |
74 | const char *secname; | |
75 | const char *strsecname; | |
76 | } names[] = { { ".stab", ".stabstr" } }; | |
77 | unsigned int i; | |
78 | PTR shandle; | |
79 | ||
80 | *pfound = false; | |
81 | shandle = NULL; | |
82 | ||
83 | for (i = 0; i < sizeof names / sizeof names[0]; i++) | |
84 | { | |
85 | asection *sec, *strsec; | |
86 | ||
87 | sec = bfd_get_section_by_name (abfd, names[i].secname); | |
88 | strsec = bfd_get_section_by_name (abfd, names[i].strsecname); | |
89 | if (sec != NULL && strsec != NULL) | |
90 | { | |
91 | bfd_size_type stabsize, strsize; | |
92 | bfd_byte *stabs, *strings; | |
93 | bfd_byte *stab; | |
94 | bfd_size_type stroff, next_stroff; | |
95 | ||
96 | stabsize = bfd_section_size (abfd, sec); | |
97 | stabs = (bfd_byte *) xmalloc (stabsize); | |
98 | if (! bfd_get_section_contents (abfd, sec, stabs, 0, stabsize)) | |
99 | { | |
100 | fprintf (stderr, "%s: %s: %s\n", | |
101 | bfd_get_filename (abfd), names[i].secname, | |
102 | bfd_errmsg (bfd_get_error ())); | |
103 | return false; | |
104 | } | |
105 | ||
106 | strsize = bfd_section_size (abfd, strsec); | |
107 | strings = (bfd_byte *) xmalloc (strsize); | |
108 | if (! bfd_get_section_contents (abfd, strsec, strings, 0, strsize)) | |
109 | { | |
110 | fprintf (stderr, "%s: %s: %s\n", | |
111 | bfd_get_filename (abfd), names[i].strsecname, | |
112 | bfd_errmsg (bfd_get_error ())); | |
113 | return false; | |
114 | } | |
115 | ||
116 | if (shandle == NULL) | |
117 | { | |
118 | shandle = start_stab (dhandle); | |
119 | if (shandle == NULL) | |
120 | return false; | |
121 | } | |
122 | ||
123 | *pfound = true; | |
124 | ||
125 | stroff = 0; | |
126 | next_stroff = 0; | |
127 | for (stab = stabs; stab < stabs + stabsize; stab += 12) | |
128 | { | |
129 | bfd_size_type strx; | |
130 | int type; | |
131 | int other; | |
132 | int desc; | |
133 | bfd_vma value; | |
134 | ||
135 | /* This code presumes 32 bit values. */ | |
136 | ||
137 | strx = bfd_get_32 (abfd, stab); | |
138 | type = bfd_get_8 (abfd, stab + 4); | |
139 | other = bfd_get_8 (abfd, stab + 5); | |
140 | desc = bfd_get_16 (abfd, stab + 6); | |
141 | value = bfd_get_32 (abfd, stab + 8); | |
142 | ||
143 | if (type == 0) | |
144 | { | |
145 | /* Special type 0 stabs indicate the offset to the | |
146 | next string table. */ | |
147 | stroff = next_stroff; | |
148 | next_stroff += value; | |
149 | } | |
150 | else | |
151 | { | |
152 | char *f, *s; | |
153 | ||
154 | f = NULL; | |
155 | s = (char *) strings + stroff + strx; | |
156 | while (s[strlen (s) - 1] == '\\' | |
157 | && stab + 12 < stabs + stabsize) | |
158 | { | |
159 | stab += 12; | |
160 | s[strlen (s) - 1] = '\0'; | |
161 | s = concat (s, | |
162 | ((char *) strings | |
163 | + stroff | |
164 | + bfd_get_32 (abfd, stab)), | |
165 | (const char *) NULL); | |
166 | if (f != NULL) | |
167 | free (f); | |
168 | f = s; | |
169 | } | |
170 | ||
171 | if (! parse_stab (dhandle, shandle, type, desc, value, s)) | |
172 | return false; | |
173 | ||
174 | /* Don't free f, since I think the stabs code | |
175 | expects strings to hang around. This should be | |
176 | straightened out. FIXME. */ | |
177 | } | |
178 | } | |
179 | ||
180 | free (stabs); | |
181 | ||
182 | /* Don't free strings, since I think the stabs code expects | |
183 | the strings to hang around. This should be straightened | |
184 | out. FIXME. */ | |
185 | } | |
186 | } | |
187 | ||
188 | if (shandle != NULL) | |
189 | { | |
190 | if (! finish_stab (dhandle, shandle)) | |
191 | return false; | |
192 | } | |
193 | ||
194 | return true; | |
195 | } |