1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
|
/*
Copyright (C) 2000-2006 Silicon Graphics, Inc. All Rights Reserved.
Portions Copyright 2007-2010 Sun Microsystems, Inc. All rights reserved.
Portions Copyright 2008-2010 Arxan Technologies, Inc. All rights reserved.
Portions Copyright 2011 David Anderson. All rights reserved.
This program is free software; you can redistribute it and/or modify it
under the terms of version 2.1 of the GNU Lesser General Public License
as published by the Free Software Foundation.
This program is distributed in the hope that it would be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
Further, this software is distributed without any warranty that it is
free of the rightful claim of any third person regarding infringement
or the like. Any license provided herein, whether implied or
otherwise, applies only to this software file. Patent licenses, if
any, provided herein do not apply to combinations of this program with
other software, or any other product whatsoever.
You should have received a copy of the GNU Lesser General Public
License along with this program; if not, write the Free Software
Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston MA 02110-1301,
USA.
Contact information: Silicon Graphics, Inc., 1500 Crittenden Lane,
Mountain View, CA 94043, or:
http://www.sgi.com
For further information regarding this notice, see:
http://oss.sgi.com/projects/GenInfo/NoticeExplan
*/
#include "config.h"
#include "dwarf_incl.h"
#include "dwarf_elf_access.h"
#ifdef HAVE_ELF_H
#include <elf.h>
#endif
#ifdef HAVE_LIBELF_H
#include <libelf.h>
#else
#ifdef HAVE_LIBELF_LIBELF_H
#include <libelf/libelf.h>
#endif
#endif
#include <stdio.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <string.h>
#include <stdlib.h>
#define DWARF_DBG_ERROR(dbg,errval,retval) \
_dwarf_error(dbg, error, errval); return(retval);
#define FALSE 0
#define TRUE 1
static int
dwarf_elf_init_file_ownership(dwarf_elf_handle elf_file_pointer,
int libdwarf_owns_elf,
Dwarf_Unsigned access,
Dwarf_Handler errhand,
Dwarf_Ptr errarg,
Dwarf_Debug * ret_dbg,
Dwarf_Error * error);
/* The basic dwarf initializer function for consumers using
libelf.
Return a libdwarf error code on error, return DW_DLV_OK
if this succeeds. */
int
dwarf_init(int fd,
Dwarf_Unsigned access,
Dwarf_Handler errhand,
Dwarf_Ptr errarg, Dwarf_Debug * ret_dbg, Dwarf_Error * error)
{
struct stat fstat_buf;
dwarf_elf_handle elf_file_pointer = 0;
/* ELF_C_READ is a portable value */
Elf_Cmd what_kind_of_elf_read = ELF_C_READ;
#if !defined(S_ISREG)
#define S_ISREG(mode) (((mode) & S_IFMT) == S_IFREG)
#endif
if (fstat(fd, &fstat_buf) != 0) {
DWARF_DBG_ERROR(NULL, DW_DLE_FSTAT_ERROR, DW_DLV_ERROR);
}
if (!S_ISREG(fstat_buf.st_mode)) {
DWARF_DBG_ERROR(NULL, DW_DLE_FSTAT_MODE_ERROR, DW_DLV_ERROR);
}
if (access != DW_DLC_READ) {
DWARF_DBG_ERROR(NULL, DW_DLE_INIT_ACCESS_WRONG, DW_DLV_ERROR);
}
elf_version(EV_CURRENT);
/* Changed to mmap request per bug 281217. 6/95 */
#ifdef HAVE_ELF_C_READ_MMAP
/* ELF_C_READ_MMAP is an SGI IRIX specific enum value from IRIX
libelf.h meaning read but use mmap */
what_kind_of_elf_read = ELF_C_READ_MMAP;
#endif /* !HAVE_ELF_C_READ_MMAP */
elf_file_pointer = elf_begin(fd, what_kind_of_elf_read, 0);
if (elf_file_pointer == NULL) {
DWARF_DBG_ERROR(NULL, DW_DLE_ELF_BEGIN_ERROR, DW_DLV_ERROR);
}
return dwarf_elf_init_file_ownership(elf_file_pointer,
TRUE, access, errhand, errarg, ret_dbg, error);
}
/* An alternate dwarf setup call for consumers using
libelf.
When the caller has opened libelf already, so the
caller must free libelf. */
int
dwarf_elf_init(dwarf_elf_handle elf_file_pointer,
Dwarf_Unsigned access,
Dwarf_Handler errhand,
Dwarf_Ptr errarg,
Dwarf_Debug * ret_dbg, Dwarf_Error * error)
{
return dwarf_elf_init_file_ownership(elf_file_pointer,
FALSE, access, errhand, errarg, ret_dbg, error);
}
/* Initialize the ELF object access for libdwarf. */
static int
dwarf_elf_init_file_ownership(dwarf_elf_handle elf_file_pointer,
int libdwarf_owns_elf,
Dwarf_Unsigned access,
Dwarf_Handler errhand,
Dwarf_Ptr errarg,
Dwarf_Debug * ret_dbg,
Dwarf_Error * error)
{
/* ELF is no longer tied to libdwarf. */
Dwarf_Obj_Access_Interface *binary_interface = 0;
int res = DW_DLV_OK;
int err = 0;
if (access != DW_DLC_READ) {
DWARF_DBG_ERROR(NULL, DW_DLE_INIT_ACCESS_WRONG, DW_DLV_ERROR);
}
/* This allocates and fills in *binary_interface. */
res = dwarf_elf_object_access_init(
elf_file_pointer,
libdwarf_owns_elf,
&binary_interface,
&err);
if(res != DW_DLV_OK){
DWARF_DBG_ERROR(NULL, err, DW_DLV_ERROR);
}
/* This mallocs space and returns pointer thru ret_dbg,
saving the binary interface in 'ret-dbg' */
res = dwarf_object_init(binary_interface, errhand, errarg,
ret_dbg, error);
if(res != DW_DLV_OK){
dwarf_elf_object_access_finish(binary_interface);
}
return res;
}
/*
Frees all memory that was not previously freed
by dwarf_dealloc.
Aside from certain categories.
This is only applicable when dwarf_init() or dwarf_elf_init()
was used to init 'dbg'.
*/
int
dwarf_finish(Dwarf_Debug dbg, Dwarf_Error * error)
{
dwarf_elf_object_access_finish(dbg->de_obj_file);
return dwarf_object_finish(dbg, error);
}
|
