1 /* $NetBSD: libdwarf_sections.c,v 1.2 2014/03/09 16:58:04 christos Exp $ */
2
3 /*-
4 * Copyright (c) 2010 Kai Wang
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29 #include "_libdwarf.h"
30
31 __RCSID("$NetBSD: libdwarf_sections.c,v 1.2 2014/03/09 16:58:04 christos Exp $");
32 ELFTC_VCSID("Id: libdwarf_sections.c 2379 2012-01-05 02:08:20Z jkoshy ");
33
34 #define _SECTION_INIT_SIZE 128
35
36 int
_dwarf_section_init(Dwarf_P_Debug dbg,Dwarf_P_Section * dsp,const char * name,int pseudo,Dwarf_Error * error)37 _dwarf_section_init(Dwarf_P_Debug dbg, Dwarf_P_Section *dsp, const char *name,
38 int pseudo, Dwarf_Error *error)
39 {
40 Dwarf_P_Section ds;
41
42 assert(dbg != NULL && dsp != NULL && name != NULL);
43
44 if ((ds = calloc(1, sizeof(struct _Dwarf_P_Section))) == NULL) {
45 DWARF_SET_ERROR(dbg, error, DW_DLE_MEMORY);
46 return (DW_DLE_MEMORY);
47 }
48
49 if ((ds->ds_name = strdup(name)) == NULL) {
50 free(ds);
51 DWARF_SET_ERROR(dbg, error, DW_DLE_MEMORY);
52 return (DW_DLE_MEMORY);
53 }
54
55 if (!pseudo) {
56 ds->ds_cap = _SECTION_INIT_SIZE;
57 if ((ds->ds_data = malloc((size_t) ds->ds_cap)) == NULL) {
58 free(ds->ds_name);
59 free(ds);
60 DWARF_SET_ERROR(dbg, error, DW_DLE_MEMORY);
61 return (DW_DLE_MEMORY);
62 }
63 STAILQ_INSERT_TAIL(&dbg->dbgp_seclist, ds, ds_next);
64 dbg->dbgp_seccnt++;
65 }
66
67 *dsp = ds;
68
69 return (DW_DLE_NONE);
70 }
71
72 void
_dwarf_section_free(Dwarf_P_Debug dbg,Dwarf_P_Section * dsp)73 _dwarf_section_free(Dwarf_P_Debug dbg, Dwarf_P_Section *dsp)
74 {
75 Dwarf_P_Section ds, tds;
76
77 assert(dbg != NULL && dsp != NULL);
78
79 if (*dsp == NULL)
80 return;
81
82 STAILQ_FOREACH_SAFE(ds, &dbg->dbgp_seclist, ds_next, tds) {
83 if (ds == *dsp) {
84 STAILQ_REMOVE(&dbg->dbgp_seclist, ds, _Dwarf_P_Section,
85 ds_next);
86 dbg->dbgp_seccnt--;
87 break;
88 }
89 }
90 ds = *dsp;
91 if (ds->ds_name)
92 free(ds->ds_name);
93 if (ds->ds_data)
94 free(ds->ds_data);
95 free(ds);
96 *dsp = NULL;
97 }
98
99 int
_dwarf_pro_callback(Dwarf_P_Debug dbg,char * name,int size,Dwarf_Unsigned type,Dwarf_Unsigned flags,Dwarf_Unsigned link,Dwarf_Unsigned info,Dwarf_Unsigned * symndx,int * error)100 _dwarf_pro_callback(Dwarf_P_Debug dbg, char *name, int size,
101 Dwarf_Unsigned type, Dwarf_Unsigned flags, Dwarf_Unsigned link,
102 Dwarf_Unsigned info, Dwarf_Unsigned *symndx, int *error)
103 {
104 int e, ret, isymndx;
105
106 assert(dbg != NULL && name != NULL && symndx != NULL);
107
108 if (dbg->dbgp_func_b)
109 ret = dbg->dbgp_func_b(name, size, type, flags, link, info,
110 symndx, &e);
111 else {
112 ret = dbg->dbgp_func(name, size, type, flags, link, info,
113 &isymndx, &e);
114 *symndx = isymndx;
115 }
116 if (ret < 0) {
117 if (error)
118 *error = e;
119 }
120
121 return (ret);
122 }
123
124 int
_dwarf_section_callback(Dwarf_P_Debug dbg,Dwarf_P_Section ds,Dwarf_Unsigned type,Dwarf_Unsigned flags,Dwarf_Unsigned link,Dwarf_Unsigned info,Dwarf_Error * error)125 _dwarf_section_callback(Dwarf_P_Debug dbg, Dwarf_P_Section ds,
126 Dwarf_Unsigned type, Dwarf_Unsigned flags, Dwarf_Unsigned link,
127 Dwarf_Unsigned info, Dwarf_Error *error)
128 {
129 int ret, ndx;
130
131 ndx = _dwarf_pro_callback(dbg, ds->ds_name, (int) ds->ds_size,
132 type, flags, link, info, &ds->ds_symndx, NULL);
133 if (ndx < 0) {
134 ret = DW_DLE_ELF_SECT_ERR;
135 DWARF_SET_ERROR(dbg, error, ret);
136 return (ret);
137 }
138 ds->ds_ndx = ndx;
139
140 return (DW_DLE_NONE);
141 }
142
143 int
_dwarf_generate_sections(Dwarf_P_Debug dbg,Dwarf_Error * error)144 _dwarf_generate_sections(Dwarf_P_Debug dbg, Dwarf_Error *error)
145 {
146 int ret;
147
148 /* Produce .debug_info section. */
149 if ((ret = _dwarf_info_gen(dbg, error)) != DW_DLE_NONE)
150 return (ret);
151
152 /* Produce .debug_abbrev section. */
153 if ((ret = _dwarf_abbrev_gen(dbg, error)) != DW_DLE_NONE)
154 return (ret);
155
156 /* Produce .debug_line section. */
157 if ((ret = _dwarf_lineno_gen(dbg, error)) != DW_DLE_NONE)
158 return (ret);
159
160 /* Produce .debug_frame section. */
161 if ((ret = _dwarf_frame_gen(dbg, error)) != DW_DLE_NONE)
162 return (ret);
163
164 /* Produce .debug_aranges section. */
165 if ((ret = _dwarf_arange_gen(dbg, error)) != DW_DLE_NONE)
166 return (ret);
167
168 /* Produce .debug_macinfo section. */
169 if ((ret = _dwarf_macinfo_gen(dbg, error)) != DW_DLE_NONE)
170 return (ret);
171
172 /* Produce .debug_pubnames section. */
173 if ((ret = _dwarf_nametbl_gen(dbg, ".debug_pubnames", dbg->dbgp_pubs,
174 error)) != DW_DLE_NONE)
175 return (ret);
176
177 /* Produce .debug_weaknames section. */
178 if ((ret = _dwarf_nametbl_gen(dbg, ".debug_weaknames", dbg->dbgp_weaks,
179 error)) != DW_DLE_NONE)
180 return (ret);
181
182 /* Produce .debug_funcnames section. */
183 if ((ret = _dwarf_nametbl_gen(dbg, ".debug_funcnames", dbg->dbgp_funcs,
184 error)) != DW_DLE_NONE)
185 return (ret);
186
187 /* Produce .debug_typenames section. */
188 if ((ret = _dwarf_nametbl_gen(dbg, ".debug_typenames", dbg->dbgp_types,
189 error)) != DW_DLE_NONE)
190 return (ret);
191
192 /* Produce .debug_varnames section. */
193 if ((ret = _dwarf_nametbl_gen(dbg, ".debug_varnames", dbg->dbgp_vars,
194 error)) != DW_DLE_NONE)
195 return (ret);
196
197 /* Produce .debug_str section. */
198 if ((ret = _dwarf_strtab_gen(dbg, error)) != DW_DLE_NONE)
199 return (ret);
200
201 /* Finally, update and generate all relocation sections. */
202 if ((ret = _dwarf_reloc_gen(dbg, error)) != DW_DLE_NONE)
203 return (ret);
204
205 /* Set section/relocation iterator to the first element. */
206 dbg->dbgp_secpos = STAILQ_FIRST(&dbg->dbgp_seclist);
207 dbg->dbgp_drspos = STAILQ_FIRST(&dbg->dbgp_drslist);
208
209 return (DW_DLE_NONE);
210 }
211
212 Dwarf_Section *
_dwarf_find_section(Dwarf_Debug dbg,const char * name)213 _dwarf_find_section(Dwarf_Debug dbg, const char *name)
214 {
215 Dwarf_Section *ds;
216 Dwarf_Half i;
217
218 assert(name != NULL);
219
220 for (i = 0; i < dbg->dbg_seccnt; i++) {
221 ds = &dbg->dbg_section[i];
222 if (ds->ds_name != NULL && !strcmp(ds->ds_name, name))
223 return (ds);
224 }
225
226 return (NULL);
227 }
228
229 Dwarf_P_Section
_dwarf_pro_find_section(Dwarf_P_Debug dbg,const char * name)230 _dwarf_pro_find_section(Dwarf_P_Debug dbg, const char *name)
231 {
232 Dwarf_P_Section ds;
233
234 assert(dbg != NULL && name != NULL);
235
236 STAILQ_FOREACH(ds, &dbg->dbgp_seclist, ds_next) {
237 if (ds->ds_name != NULL && !strcmp(ds->ds_name ,name))
238 return (ds);
239 }
240
241 return (NULL);
242 }
243
244 void
_dwarf_section_cleanup(Dwarf_P_Debug dbg)245 _dwarf_section_cleanup(Dwarf_P_Debug dbg)
246 {
247 Dwarf_P_Section ds, tds;
248
249 assert(dbg != NULL && dbg->dbg_mode == DW_DLC_WRITE);
250
251 STAILQ_FOREACH_SAFE(ds, &dbg->dbgp_seclist, ds_next, tds) {
252 STAILQ_REMOVE(&dbg->dbgp_seclist, ds, _Dwarf_P_Section,
253 ds_next);
254 if (ds->ds_name)
255 free(ds->ds_name);
256 if (ds->ds_data)
257 free(ds->ds_data);
258 free(ds);
259 }
260 dbg->dbgp_seccnt = 0;
261 dbg->dbgp_secpos = 0;
262 }
263