1/*	$NetBSD: libdwarf_elf_access.c,v 1.5 2024/03/03 17:37:32 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 1.5 2024/03/03 17:37:32 christos Exp $");
32ELFTC_VCSID("Id: libdwarf_elf_access.c 2070 2011-10-27 03:05:32Z jkoshy");
33
34int
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
71Dwarf_Endianness
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
90Dwarf_Small
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
106Dwarf_Small
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
120Dwarf_Unsigned
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
131int
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