1 /* $NetBSD: libdwarf_elf_access.c,v 1.2 2014/03/09 16:58:04 christos Exp $ */
2
3 /*-
4 * Copyright (c) 2009 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_elf_access.c,v 1.2 2014/03/09 16:58:04 christos Exp $");
32 ELFTC_VCSID("Id: libdwarf_elf_access.c 2070 2011-10-27 03:05:32Z jkoshy ");
33
34 int
_dwarf_elf_get_section_info(void * obj,Dwarf_Half ndx,Dwarf_Obj_Access_Section * ret_section,int * error)35 _dwarf_elf_get_section_info(void *obj, Dwarf_Half ndx,
36 Dwarf_Obj_Access_Section *ret_section, int *error)
37 {
38 Dwarf_Elf_Object *e;
39 GElf_Shdr *sh;
40
41 e = obj;
42 assert(e != NULL);
43
44 if (ret_section == NULL) {
45 if (error)
46 *error = DW_DLE_ARGUMENT;
47 return (DW_DLV_ERROR);
48 }
49
50 if (ndx >= e->eo_seccnt) {
51 if (error)
52 *error = DW_DLE_NO_ENTRY;
53 return (DW_DLV_NO_ENTRY);
54 }
55
56 sh = &e->eo_shdr[ndx];
57
58 ret_section->addr = sh->sh_addr;
59 ret_section->size = sh->sh_size;
60
61 ret_section->name = elf_strptr(e->eo_elf, e->eo_strndx, sh->sh_name);
62 if (ret_section->name == NULL) {
63 if (error)
64 *error = DW_DLE_ELF;
65 return (DW_DLV_ERROR);
66 }
67
68 return (DW_DLV_OK);
69 }
70
71 Dwarf_Endianness
_dwarf_elf_get_byte_order(void * obj)72 _dwarf_elf_get_byte_order(void *obj)
73 {
74 Dwarf_Elf_Object *e;
75
76 e = obj;
77 assert(e != NULL);
78
79 switch (e->eo_ehdr.e_ident[EI_DATA]) {
80 case ELFDATA2MSB:
81 return (DW_OBJECT_MSB);
82
83 case ELFDATA2LSB:
84 case ELFDATANONE:
85 default:
86 return (DW_OBJECT_LSB);
87 }
88 }
89
90 Dwarf_Small
_dwarf_elf_get_length_size(void * obj)91 _dwarf_elf_get_length_size(void *obj)
92 {
93 Dwarf_Elf_Object *e;
94
95 e = obj;
96 assert(e != NULL);
97
98 if (gelf_getclass(e->eo_elf) == ELFCLASS32)
99 return (4);
100 else if (e->eo_ehdr.e_machine == EM_MIPS)
101 return (8);
102 else
103 return (4);
104 }
105
106 Dwarf_Small
_dwarf_elf_get_pointer_size(void * obj)107 _dwarf_elf_get_pointer_size(void *obj)
108 {
109 Dwarf_Elf_Object *e;
110
111 e = obj;
112 assert(e != NULL);
113
114 if (gelf_getclass(e->eo_elf) == ELFCLASS32)
115 return (4);
116 else
117 return (8);
118 }
119
120 Dwarf_Unsigned
_dwarf_elf_get_section_count(void * obj)121 _dwarf_elf_get_section_count(void *obj)
122 {
123 Dwarf_Elf_Object *e;
124
125 e = obj;
126 assert(e != NULL);
127
128 return (e->eo_seccnt);
129 }
130
131 int
_dwarf_elf_load_section(void * obj,Dwarf_Half ndx,Dwarf_Small ** ret_data,int * error)132 _dwarf_elf_load_section(void *obj, Dwarf_Half ndx, Dwarf_Small** ret_data,
133 int *error)
134 {
135 Dwarf_Elf_Object *e;
136 Dwarf_Elf_Data *ed;
137
138 e = obj;
139 assert(e != NULL);
140
141 if (ret_data == NULL) {
142 if (error)
143 *error = DW_DLE_ARGUMENT;
144 return (DW_DLV_ERROR);
145 }
146
147 if (ndx >= e->eo_seccnt) {
148 if (error)
149 *error = DW_DLE_NO_ENTRY;
150 return (DW_DLV_NO_ENTRY);
151 }
152
153 ed = &e->eo_data[ndx];
154
155 if (ed->ed_alloc != NULL)
156 *ret_data = ed->ed_alloc;
157 else {
158 if (ed->ed_data == NULL) {
159 if (error)
160 *error = DW_DLE_NO_ENTRY;
161 return (DW_DLV_NO_ENTRY);
162 }
163 *ret_data = ed->ed_data->d_buf;
164 }
165
166 return (DW_DLV_OK);
167 }
168