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
|
#!/usr/bin/perl -w
# -*- Mode: perl; tab-width: 4; indent-tabs-mode: nil; -*-
# ***** BEGIN LICENSE BLOCK *****
# Version: MPL 1.1/GPL 2.0/LGPL 2.1
#
# The contents of this file are subject to the Mozilla Public License Version
# 1.1 (the "License"); you may not use this file except in compliance with
# the License. You may obtain a copy of the License at
# http://www.mozilla.org/MPL/
#
# Software distributed under the License is distributed on an "AS IS" basis,
# WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
# for the specific language governing rights and limitations under the
# License.
#
# The Original Code is readelf_wrap.pl.
#
# The Initial Developer of the Original Code is
# IBM Corporation.
# Portions created by the Initial Developer are Copyright (C) 2003
# the Initial Developer. All Rights Reserved.
#
# Contributor(s):
# Brian Ryner <bryner@brianryner.com>
#
# Alternatively, the contents of this file may be used under the terms of
# either the GNU General Public License Version 2 or later (the "GPL"), or
# the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
# in which case the provisions of the GPL or the LGPL are applicable instead
# of those above. If you wish to allow use of your version of this file only
# under the terms of either the GPL or the LGPL, and not to allow others to
# use your version of this file under the terms of the MPL, indicate your
# decision by deleting the provisions above and replace them with the notice
# and other provisions required by the GPL or the LGPL. If you do not delete
# the provisions above, a recipient may use your version of this file under
# the terms of any one of the MPL, the GPL or the LGPL.
#
# ***** END LICENSE BLOCK *****
use strict;
# Section fields (the full list of values is in <elf.h>)
my $SECT_NUM = 0; # section index
my $SECT_NAME = 1; # section name
my $SECT_TYPE = 2; # section type
my $SECT_ADDR = 3; # section virtual address
my $SECT_OFF = 4; # section offset in file
my $SECT_SIZE = 5; # size of section
my $SECT_ES = 6; # section entry size
my $SECT_FLG = 7; # section flags
my $SECT_LK = 8; # link to another section
my $SECT_INF = 9; # additional section info
my $SECT_AL = 10; # section alignment
# Symbol fields (note: the full list of possible values for each field
# is given in <elf.h>)
my $SYM_NUM = 0; # unique index of the symbol
my $SYM_VALUE = 1; # value of the symbol
my $SYM_SIZE = 2; # size of the symbol
my $SYM_TYPE = 3; # type (NOTYPE, OBJECT, FUNC, SECTION, FILE, ...)
my $SYM_BIND = 4; # binding/scope (LOCAL, GLOBAL, WEAK, ...)
my $SYM_VIS = 5; # visibility (DEFAULT, INTERNAL, HIDDEN, PROTECTED)
my $SYM_NDX = 6; # index of section the symbol is in
my $SYM_NAME = 7; # name of the symbol
my $SYM_FILE = 8; # (not part of readelf) file for symbol
# Tell readelf to print out the list of sections and then the symbols
die "Usage: $^X <binary>\n" unless ($#ARGV >= 0);
my $readelf = $ENV{'READELF_PROG'};
if (!$readelf) {
$readelf = 'readelf';
}
open(READELF_OUTPUT, "$readelf -Ss $ARGV[0] 2>/dev/null | c++filt |") or die "readelf failed to run on $ARGV[0]\n";
my @section_list;
my @symbol_list;
my ($module) = ($ARGV[0] =~ /([^\/]+)$/);
my $in_symbols = 0;
while (<READELF_OUTPUT>) {
if (!$in_symbols) {
if (/^ *\[ *(\d+)\]/) {
my @section;
# note that we strip off the leading '.' of section names for
# readability
if (! (@section = (/^ *\[ *(\d+)\] \.([\w\.\-]+) *(\w+) *(.{8}) (.{6}[0-9a-fA-F]*) (.{6}[0-9a-fA-F]*) *(\d+) ([a-zA-Z]+ +| +[a-zA-Z]+|) *(\d+) *(\w+) *(\d+)/))) {
# capture the 'null' section which has no name, so that the
# array indices are the same as the section indices.
@section = ($1, '', 'NULL', '00000000', '000000', '000000',
'00', '', '0', '0', '0');
}
push (@section_list, \@section);
} elsif (/^Symbol table/) {
$in_symbols = 1;
}
} else {
my @sym;
if (@sym = /^\s*(\d+): (\w+)\s*(\d+)\s*(\w+)\s*(\w+)\s*(\w+)\s*(\w+) (.*)/)
{
# Filter out types of symbols that we don't care about:
# - anything that's not of type OBJECT or FUNC
# - any undefined symbols (ndx = UND[EF])
# - any 0-size symbols
if (($sym[$SYM_TYPE] !~ /^(OBJECT|FUNC)$/) ||
$sym[$SYM_NDX] eq 'UND' || $sym[$SYM_NDX] eq 'UNDEF'
|| $sym[$SYM_SIZE] eq '0') {
next;
}
push (@symbol_list, \@sym);
}
elsif (/^Symbol table .*'\.symtab'/) {
# We've been using .dynsym up to this point, but if we have .symtab
# available, it will have everything in .dynsym and more.
# So, reset our symbol list.
@symbol_list = ();
}
}
}
close(READELF_OUTPUT);
# spit them out in codesighs TSV format
my $sym;
my @section_sizes;
$#section_sizes = $#section_list;
foreach (@section_sizes) { $_ = 0; }
foreach $sym (@symbol_list) {
# size
printf "%08x\t", $sym->[$SYM_SIZE];
# code or data
if ($sym->[$SYM_TYPE] eq 'FUNC') {
print "CODE\t";
} else { # OBJECT
print "DATA\t";
}
# scope
if ($sym->[$SYM_BIND] eq 'LOCAL') {
print "STATIC\t";
} elsif ($sym->[$SYM_BIND] =~ /(GLOBAL|WEAK)/) {
print "PUBLIC\t";
} else {
print "UNDEF\t";
}
# module name
print "$module\t";
# section
my $section = $section_list[$sym->[$SYM_NDX]]->[$SECT_NAME];
print "$section\t";
# should be the object file, but for now just module/section
print "UNDEF:$module:$section\t";
# now the symbol name
print $sym->[$SYM_NAME]."\n";
# update our cumulative section sizes
$section_sizes[$section_list[$sym->[$SYM_NDX]]->[$SECT_NUM]] += $sym->[$SYM_SIZE];
}
# Output extra entries to make the sum of the symbol sizes equal the
# section size.
my $section;
foreach $section (@section_list) {
my $diff = hex($section->[$SECT_SIZE]) - $section_sizes[$section->[$SECT_NUM]];
if ($diff > 0) {
my $sectname = $section->[$SECT_NAME];
if ($section->[$SECT_NAME] =~ /^(rodata|data|text|bss)/) {
printf "%08x", $diff;
print "\tDATA\tSTATIC\t$module\t$sectname\tUNDEF:$module:$sectname\t.nosyms.$sectname\n";
# } else {
# print "ignoring $diff bytes of empty space in $sectname section\n";
}
}
}
|
