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[FreeBSD/FreeBSD.git] / contrib / elftoolchain / libdwarf / libdwarf_elf_access.c
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
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
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
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
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
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
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 }