1 /*-
2 * Copyright (c) 2009 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
29 ELFTC_VCSID("$Id: libdwarf_elf_access.c 2070 2011-10-27 03:05:32Z jkoshy $");
30
31 int
_dwarf_elf_get_section_info(void * obj,Dwarf_Half ndx,Dwarf_Obj_Access_Section * ret_section,int * error)32 _dwarf_elf_get_section_info(void *obj, Dwarf_Half ndx,
33 Dwarf_Obj_Access_Section *ret_section, int *error)
34 {
35 Dwarf_Elf_Object *e;
36 GElf_Shdr *sh;
37
38 e = obj;
39 assert(e != NULL);
40
41 if (ret_section == NULL) {
42 if (error)
43 *error = DW_DLE_ARGUMENT;
44 return (DW_DLV_ERROR);
45 }
46
47 if (ndx >= e->eo_seccnt) {
48 if (error)
49 *error = DW_DLE_NO_ENTRY;
50 return (DW_DLV_NO_ENTRY);
51 }
52
53 sh = &e->eo_shdr[ndx];
54
55 ret_section->addr = sh->sh_addr;
56 ret_section->size = sh->sh_size;
57
58 ret_section->name = elf_strptr(e->eo_elf, e->eo_strndx, sh->sh_name);
59 if (ret_section->name == NULL) {
60 if (error)
61 *error = DW_DLE_ELF;
62 return (DW_DLV_ERROR);
63 }
64
65 return (DW_DLV_OK);
66 }
67
68 Dwarf_Endianness
_dwarf_elf_get_byte_order(void * obj)69 _dwarf_elf_get_byte_order(void *obj)
70 {
71 Dwarf_Elf_Object *e;
72
73 e = obj;
74 assert(e != NULL);
75
76 switch (e->eo_ehdr.e_ident[EI_DATA]) {
77 case ELFDATA2MSB:
78 return (DW_OBJECT_MSB);
79
80 case ELFDATA2LSB:
81 case ELFDATANONE:
82 default:
83 return (DW_OBJECT_LSB);
84 }
85 }
86
87 Dwarf_Small
_dwarf_elf_get_length_size(void * obj)88 _dwarf_elf_get_length_size(void *obj)
89 {
90 Dwarf_Elf_Object *e;
91
92 e = obj;
93 assert(e != NULL);
94
95 if (gelf_getclass(e->eo_elf) == ELFCLASS32)
96 return (4);
97 else if (e->eo_ehdr.e_machine == EM_MIPS)
98 return (8);
99 else
100 return (4);
101 }
102
103 Dwarf_Small
_dwarf_elf_get_pointer_size(void * obj)104 _dwarf_elf_get_pointer_size(void *obj)
105 {
106 Dwarf_Elf_Object *e;
107
108 e = obj;
109 assert(e != NULL);
110
111 if (gelf_getclass(e->eo_elf) == ELFCLASS32)
112 return (4);
113 else
114 return (8);
115 }
116
117 Dwarf_Unsigned
_dwarf_elf_get_section_count(void * obj)118 _dwarf_elf_get_section_count(void *obj)
119 {
120 Dwarf_Elf_Object *e;
121
122 e = obj;
123 assert(e != NULL);
124
125 return (e->eo_seccnt);
126 }
127
128 int
_dwarf_elf_load_section(void * obj,Dwarf_Half ndx,Dwarf_Small ** ret_data,int * error)129 _dwarf_elf_load_section(void *obj, Dwarf_Half ndx, Dwarf_Small** ret_data,
130 int *error)
131 {
132 Dwarf_Elf_Object *e;
133 Dwarf_Elf_Data *ed;
134
135 e = obj;
136 assert(e != NULL);
137
138 if (ret_data == NULL) {
139 if (error)
140 *error = DW_DLE_ARGUMENT;
141 return (DW_DLV_ERROR);
142 }
143
144 if (ndx >= e->eo_seccnt) {
145 if (error)
146 *error = DW_DLE_NO_ENTRY;
147 return (DW_DLV_NO_ENTRY);
148 }
149
150 ed = &e->eo_data[ndx];
151
152 if (ed->ed_alloc != NULL)
153 *ret_data = ed->ed_alloc;
154 else {
155 if (ed->ed_data == NULL) {
156 if (error)
157 *error = DW_DLE_NO_ENTRY;
158 return (DW_DLV_NO_ENTRY);
159 }
160 *ret_data = ed->ed_data->d_buf;
161 }
162
163 return (DW_DLV_OK);
164 }
165