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
|
/* Low-level DWARF 2 reading code
Copyright (C) 1994-2024 Free Software Foundation, Inc.
Adapted by Gary Funck (gary@intrepid.com), Intrepid Technology,
Inc. with support from Florida State University (under contract
with the Ada Joint Program Office), and Silicon Graphics, Inc.
Initial contribution by Brent Benson, Harris Computer Systems, Inc.,
based on Fred Fish's (Cygnus Support) implementation of DWARF 1
support.
This file is part of GDB.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>. */
#include "dwarf2/leb.h"
ULONGEST
read_unsigned_leb128 (bfd *abfd, const gdb_byte *buf,
unsigned int *bytes_read_ptr)
{
ULONGEST result;
unsigned int num_read;
int shift;
unsigned char byte;
result = 0;
shift = 0;
num_read = 0;
while (1)
{
byte = bfd_get_8 (abfd, buf);
buf++;
num_read++;
result |= ((ULONGEST) (byte & 127) << shift);
if ((byte & 128) == 0)
{
break;
}
shift += 7;
}
*bytes_read_ptr = num_read;
return result;
}
LONGEST
read_signed_leb128 (bfd *abfd, const gdb_byte *buf,
unsigned int *bytes_read_ptr)
{
ULONGEST result;
int shift, num_read;
unsigned char byte;
result = 0;
shift = 0;
num_read = 0;
while (1)
{
byte = bfd_get_8 (abfd, buf);
buf++;
num_read++;
result |= ((ULONGEST) (byte & 127) << shift);
shift += 7;
if ((byte & 128) == 0)
{
break;
}
}
if ((shift < 8 * sizeof (result)) && (byte & 0x40))
result |= -(((ULONGEST) 1) << shift);
*bytes_read_ptr = num_read;
return result;
}
/* See leb.h. */
LONGEST
read_initial_length (bfd *abfd, const gdb_byte *buf, unsigned int *bytes_read,
bool handle_nonstd)
{
LONGEST length = bfd_get_32 (abfd, buf);
if (length == 0xffffffff)
{
length = bfd_get_64 (abfd, buf + 4);
*bytes_read = 12;
}
else if (handle_nonstd && length == 0)
{
/* Handle the (non-standard) 64-bit DWARF2 format used by IRIX. */
length = bfd_get_64 (abfd, buf);
*bytes_read = 8;
}
else
{
*bytes_read = 4;
}
return length;
}
/* See leb.h. */
LONGEST
read_offset (bfd *abfd, const gdb_byte *buf, unsigned int offset_size)
{
LONGEST retval = 0;
switch (offset_size)
{
case 4:
retval = bfd_get_32 (abfd, buf);
break;
case 8:
retval = bfd_get_64 (abfd, buf);
break;
default:
internal_error (_("read_offset_1: bad switch [in module %s]"),
bfd_get_filename (abfd));
}
return retval;
}
|
