libdwarf_sections.c revision 276371 
1/*-
2 * Copyright (c) 2010 Kai Wang
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 */
26
27#include "_libdwarf.h"
28
29ELFTC_VCSID("$Id: libdwarf_sections.c 3041 2014-05-18 15:11:03Z kaiwang27 $");
30
31#define	_SECTION_INIT_SIZE	128
32
33int
34_dwarf_section_init(Dwarf_P_Debug dbg, Dwarf_P_Section *dsp, const char *name,
35    int pseudo, Dwarf_Error *error)
36{
37	Dwarf_P_Section ds;
38
39	assert(dbg != NULL && dsp != NULL && name != NULL);
40
41	if ((ds = calloc(1, sizeof(struct _Dwarf_P_Section))) == NULL) {
42		DWARF_SET_ERROR(dbg, error, DW_DLE_MEMORY);
43		return (DW_DLE_MEMORY);
44	}
45
46	if ((ds->ds_name = strdup(name)) == NULL) {
47		free(ds);
48		DWARF_SET_ERROR(dbg, error, DW_DLE_MEMORY);
49		return (DW_DLE_MEMORY);
50	}
51
52	if (!pseudo) {
53		ds->ds_cap = _SECTION_INIT_SIZE;
54		if ((ds->ds_data = malloc((size_t) ds->ds_cap)) == NULL) {
55			free(ds->ds_name);
56			free(ds);
57			DWARF_SET_ERROR(dbg, error, DW_DLE_MEMORY);
58			return (DW_DLE_MEMORY);
59		}
60		STAILQ_INSERT_TAIL(&dbg->dbgp_seclist, ds, ds_next);
61		dbg->dbgp_seccnt++;
62	}
63
64	*dsp = ds;
65
66	return (DW_DLE_NONE);
67}
68
69void
70_dwarf_section_free(Dwarf_P_Debug dbg, Dwarf_P_Section *dsp)
71{
72	Dwarf_P_Section ds, tds;
73
74	assert(dbg != NULL && dsp != NULL);
75
76	if (*dsp == NULL)
77		return;
78
79	STAILQ_FOREACH_SAFE(ds, &dbg->dbgp_seclist, ds_next, tds) {
80		if (ds == *dsp) {
81			STAILQ_REMOVE(&dbg->dbgp_seclist, ds, _Dwarf_P_Section,
82			    ds_next);
83			dbg->dbgp_seccnt--;
84			break;
85		}
86	}
87	ds = *dsp;
88	if (ds->ds_name)
89		free(ds->ds_name);
90	if (ds->ds_data)
91		free(ds->ds_data);
92	free(ds);
93	*dsp = NULL;
94}
95
96int
97_dwarf_pro_callback(Dwarf_P_Debug dbg, char *name, int size,
98    Dwarf_Unsigned type, Dwarf_Unsigned flags, Dwarf_Unsigned link,
99    Dwarf_Unsigned info, Dwarf_Unsigned *symndx, int *error)
100{
101	int e, ret, isymndx;
102
103	assert(dbg != NULL && name != NULL && symndx != NULL);
104
105	if (dbg->dbgp_func_b)
106		ret = dbg->dbgp_func_b(name, size, type, flags, link, info,
107		    symndx, &e);
108	else {
109		ret = dbg->dbgp_func(name, size, type, flags, link, info,
110		    &isymndx, &e);
111		*symndx = isymndx;
112	}
113	if (ret < 0) {
114		if (error)
115			*error = e;
116	}
117
118	return (ret);
119}
120
121int
122_dwarf_section_callback(Dwarf_P_Debug dbg, Dwarf_P_Section ds,
123    Dwarf_Unsigned type, Dwarf_Unsigned flags, Dwarf_Unsigned link,
124    Dwarf_Unsigned info, Dwarf_Error *error)
125{
126	int ret, ndx;
127
128	ndx = _dwarf_pro_callback(dbg, ds->ds_name, (int) ds->ds_size,
129	    type, flags, link, info, &ds->ds_symndx, NULL);
130	if (ndx < 0) {
131		ret = DW_DLE_ELF_SECT_ERR;
132		DWARF_SET_ERROR(dbg, error, ret);
133		return (ret);
134	}
135	ds->ds_ndx = ndx;
136
137	return (DW_DLE_NONE);
138}
139
140int
141_dwarf_generate_sections(Dwarf_P_Debug dbg, Dwarf_Error *error)
142{
143	int ret;
144
145	/* Produce .debug_info section. */
146	if ((ret = _dwarf_info_gen(dbg, error)) != DW_DLE_NONE)
147		return (ret);
148
149	/* Produce .debug_abbrev section. */
150	if ((ret = _dwarf_abbrev_gen(dbg, error)) != DW_DLE_NONE)
151		return (ret);
152
153	/* Produce .debug_line section. */
154	if ((ret = _dwarf_lineno_gen(dbg, error)) != DW_DLE_NONE)
155		return (ret);
156
157	/* Produce .debug_frame section. */
158	if ((ret = _dwarf_frame_gen(dbg, error)) != DW_DLE_NONE)
159		return (ret);
160
161	/* Produce .debug_aranges section. */
162	if ((ret = _dwarf_arange_gen(dbg, error)) != DW_DLE_NONE)
163		return (ret);
164
165	/* Produce .debug_macinfo section. */
166	if ((ret = _dwarf_macinfo_gen(dbg, error)) != DW_DLE_NONE)
167		return (ret);
168
169	/* Produce .debug_pubnames section. */
170	if ((ret = _dwarf_nametbl_gen(dbg, ".debug_pubnames", dbg->dbgp_pubs,
171	    error)) != DW_DLE_NONE)
172		return (ret);
173
174	/* Produce .debug_weaknames section. */
175	if ((ret = _dwarf_nametbl_gen(dbg, ".debug_weaknames", dbg->dbgp_weaks,
176	    error)) != DW_DLE_NONE)
177		return (ret);
178
179	/* Produce .debug_funcnames section. */
180	if ((ret = _dwarf_nametbl_gen(dbg, ".debug_funcnames", dbg->dbgp_funcs,
181	    error)) != DW_DLE_NONE)
182		return (ret);
183
184	/* Produce .debug_typenames section. */
185	if ((ret = _dwarf_nametbl_gen(dbg, ".debug_typenames", dbg->dbgp_types,
186	    error)) != DW_DLE_NONE)
187		return (ret);
188
189	/* Produce .debug_varnames section. */
190	if ((ret = _dwarf_nametbl_gen(dbg, ".debug_varnames", dbg->dbgp_vars,
191	    error)) != DW_DLE_NONE)
192		return (ret);
193
194	/* Produce .debug_str section. */
195	if ((ret = _dwarf_strtab_gen(dbg, error)) != DW_DLE_NONE)
196		return (ret);
197
198	/* Finally, update and generate all relocation sections. */
199	if ((ret = _dwarf_reloc_gen(dbg, error)) != DW_DLE_NONE)
200		return (ret);
201
202	/* Set section/relocation iterator to the first element. */
203	dbg->dbgp_secpos = STAILQ_FIRST(&dbg->dbgp_seclist);
204	dbg->dbgp_drspos = STAILQ_FIRST(&dbg->dbgp_drslist);
205
206	return (DW_DLE_NONE);
207}
208
209Dwarf_Section *
210_dwarf_find_section(Dwarf_Debug dbg, const char *name)
211{
212	Dwarf_Section *ds;
213	Dwarf_Half i;
214
215	assert(dbg != NULL && name != NULL);
216
217	for (i = 0; i < dbg->dbg_seccnt; i++) {
218		ds = &dbg->dbg_section[i];
219		if (ds->ds_name != NULL && !strcmp(ds->ds_name, name))
220			return (ds);
221	}
222
223	return (NULL);
224}
225
226Dwarf_Section *
227_dwarf_find_next_types_section(Dwarf_Debug dbg, Dwarf_Section *ds)
228{
229
230	assert(dbg != NULL);
231
232	if (ds == NULL)
233		return (_dwarf_find_section(dbg, ".debug_types"));
234
235	assert(ds->ds_name != NULL);
236
237	do {
238		ds++;
239		if (ds->ds_name != NULL &&
240		    !strcmp(ds->ds_name, ".debug_types"))
241			return (ds);
242	} while (ds->ds_name != NULL);
243
244	return (NULL);
245}
246
247Dwarf_P_Section
248_dwarf_pro_find_section(Dwarf_P_Debug dbg, const char *name)
249{
250	Dwarf_P_Section ds;
251
252	assert(dbg != NULL && name != NULL);
253
254	STAILQ_FOREACH(ds, &dbg->dbgp_seclist, ds_next) {
255		if (ds->ds_name != NULL && !strcmp(ds->ds_name ,name))
256			return (ds);
257	}
258
259	return (NULL);
260}
261
262void
263_dwarf_section_cleanup(Dwarf_P_Debug dbg)
264{
265	Dwarf_P_Section ds, tds;
266
267	assert(dbg != NULL && dbg->dbg_mode == DW_DLC_WRITE);
268
269	STAILQ_FOREACH_SAFE(ds, &dbg->dbgp_seclist, ds_next, tds) {
270		STAILQ_REMOVE(&dbg->dbgp_seclist, ds, _Dwarf_P_Section,
271		    ds_next);
272		if (ds->ds_name)
273			free(ds->ds_name);
274		if (ds->ds_data)
275			free(ds->ds_data);
276		free(ds);
277	}
278	dbg->dbgp_seccnt = 0;
279	dbg->dbgp_secpos = 0;
280}
281