1 /* $NetBSD: libdwarf_str.c,v 1.5 2024/03/03 17:37:33 christos Exp $ */
2
3 /*-
4 * Copyright (c) 2009,2010,2023 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_str.c,v 1.5 2024/03/03 17:37:33 christos Exp $");
32 ELFTC_VCSID("Id: libdwarf_str.c 4016 2023-10-15 05:39:46Z kaiwang27");
33
34 #define _INIT_DWARF_STRTAB_SIZE 1024
35
36 int
_dwarf_strtab_add(Dwarf_Debug dbg,char * string,uint64_t * off,Dwarf_Error * error)37 _dwarf_strtab_add(Dwarf_Debug dbg, char *string, uint64_t *off,
38 Dwarf_Error *error)
39 {
40 size_t len;
41
42 assert(dbg != NULL && string != NULL);
43
44 len = strlen(string) + 1;
45 while (dbg->dbg_strtab_size + len > dbg->dbg_strtab_cap) {
46 dbg->dbg_strtab_cap *= 2;
47 dbg->dbg_strtab = realloc(dbg->dbg_strtab,
48 (size_t) dbg->dbg_strtab_cap);
49 if (dbg->dbg_strtab == NULL) {
50 DWARF_SET_ERROR(dbg, error, DW_DLE_MEMORY);
51 return (DW_DLE_MEMORY);
52 }
53 }
54
55 if (off != NULL)
56 *off = dbg->dbg_strtab_size;
57
58 memcpy(&dbg->dbg_strtab[dbg->dbg_strtab_size], string, len - 1);
59 dbg->dbg_strtab_size += len;
60 dbg->dbg_strtab[dbg->dbg_strtab_size - 1] = '\0';
61
62 return (DW_DLE_NONE);
63 }
64
65 char *
_dwarf_strtab_get_table(Dwarf_Debug dbg)66 _dwarf_strtab_get_table(Dwarf_Debug dbg)
67 {
68
69 assert(dbg != NULL);
70
71 return (dbg->dbg_strtab);
72 }
73
74 char *
_dwarf_strtab_get_line_table(Dwarf_Debug dbg)75 _dwarf_strtab_get_line_table(Dwarf_Debug dbg)
76 {
77
78 assert(dbg != NULL);
79
80 return (dbg->dbg_line_strtab);
81 }
82
83 int
_dwarf_strtab_init(Dwarf_Debug dbg,Dwarf_Error * error)84 _dwarf_strtab_init(Dwarf_Debug dbg, Dwarf_Error *error)
85 {
86 Dwarf_Section *ds;
87
88 assert(dbg != NULL);
89
90 if (dbg->dbg_mode == DW_DLC_READ || dbg->dbg_mode == DW_DLC_RDWR) {
91 ds = _dwarf_find_section(dbg, ".debug_str");
92 if (ds == NULL) {
93 dbg->dbg_strtab = NULL;
94 dbg->dbg_strtab_cap = dbg->dbg_strtab_size = 0;
95 return (DW_DLE_NONE);
96 }
97
98 dbg->dbg_strtab_cap = dbg->dbg_strtab_size = ds->ds_size;
99
100 if (dbg->dbg_mode == DW_DLC_RDWR) {
101 if ((dbg->dbg_strtab = malloc((size_t) ds->ds_size)) ==
102 NULL) {
103 DWARF_SET_ERROR(dbg, error, DW_DLE_MEMORY);
104 return (DW_DLE_MEMORY);
105 }
106 memcpy(dbg->dbg_strtab, ds->ds_data, ds->ds_size);
107 } else
108 dbg->dbg_strtab = (char *) ds->ds_data;
109
110 ds = _dwarf_find_section(dbg, ".debug_line_str");
111 if (ds != NULL) {
112 dbg->dbg_line_strtab = (char *) ds->ds_data;
113 }
114 } else {
115 /* DW_DLC_WRITE */
116
117 dbg->dbg_strtab_cap = _INIT_DWARF_STRTAB_SIZE;
118 dbg->dbg_strtab_size = 0;
119
120 if ((dbg->dbg_strtab = malloc((size_t) dbg->dbg_strtab_cap)) ==
121 NULL) {
122 DWARF_SET_ERROR(dbg, error, DW_DLE_MEMORY);
123 return (DW_DLE_MEMORY);
124 }
125
126 dbg->dbg_strtab[0] = '\0';
127 }
128
129 return (DW_DLE_NONE);
130 }
131
132 void
_dwarf_strtab_cleanup(Dwarf_Debug dbg)133 _dwarf_strtab_cleanup(Dwarf_Debug dbg)
134 {
135
136 assert(dbg != NULL);
137
138 if (dbg->dbg_mode == DW_DLC_RDWR || dbg->dbg_mode == DW_DLC_WRITE)
139 free(dbg->dbg_strtab);
140 }
141
142 int
_dwarf_strtab_gen(Dwarf_P_Debug dbg,Dwarf_Error * error)143 _dwarf_strtab_gen(Dwarf_P_Debug dbg, Dwarf_Error *error)
144 {
145 Dwarf_P_Section ds;
146 int ret;
147
148 assert(dbg != NULL);
149
150 if ((ret = _dwarf_section_init(dbg, &ds, ".debug_str", 0, error)) !=
151 DW_DLE_NONE)
152 return (ret);
153
154 if (dbg->dbg_strtab_size > ds->ds_cap) {
155 ds->ds_data = realloc(ds->ds_data,
156 (size_t) dbg->dbg_strtab_size);
157 if (ds->ds_data == NULL) {
158 _dwarf_section_free(dbg, &ds);
159 DWARF_SET_ERROR(dbg, error, DW_DLE_MEMORY);
160 return (DW_DLE_MEMORY);
161 }
162 ds->ds_cap = dbg->dbg_strtab_size;
163 }
164
165 memcpy(ds->ds_data, dbg->dbg_strtab, dbg->dbg_strtab_size);
166 ds->ds_size = dbg->dbg_strtab_size;
167
168 /*
169 * Inform application the creation of .debug_str ELF section.
170 * Note that .debug_str use a different format than usual ELF
171 * string table, so it should not have SHT_STRTAB as its type.
172 */
173 ret = _dwarf_section_callback(dbg, ds, SHT_PROGBITS, 0, 0, 0, error);
174
175 return (ret);
176 }
177