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
|
# SPDX-License-Identifier: GPL-2.0+
# Copyright (c) 2017 Google, Inc
# Written by Simon Glass <sjg@chromium.org>
#
# Test for the elf module
import os
import sys
import unittest
import elf
import test_util
import tools
binman_dir = os.path.dirname(os.path.realpath(sys.argv[0]))
class FakeEntry:
"""A fake Entry object, usedfor testing
This supports an entry with a given size.
"""
def __init__(self, contents_size):
self.contents_size = contents_size
self.data = 'a' * contents_size
def GetPath(self):
return 'entry_path'
class FakeSection:
"""A fake Section object, used for testing
This has the minimum feature set needed to support testing elf functions.
A LookupSymbol() function is provided which returns a fake value for amu
symbol requested.
"""
def __init__(self, sym_value=1):
self.sym_value = sym_value
def GetPath(self):
return 'section_path'
def LookupSymbol(self, name, weak, msg):
"""Fake implementation which returns the same value for all symbols"""
return self.sym_value
class TestElf(unittest.TestCase):
@classmethod
def setUpClass(self):
tools.SetInputDirs(['.'])
def testAllSymbols(self):
"""Test that we can obtain a symbol from the ELF file"""
fname = os.path.join(binman_dir, 'test', 'u_boot_ucode_ptr')
syms = elf.GetSymbols(fname, [])
self.assertIn('.ucode', syms)
def testRegexSymbols(self):
"""Test that we can obtain from the ELF file by regular expression"""
fname = os.path.join(binman_dir, 'test', 'u_boot_ucode_ptr')
syms = elf.GetSymbols(fname, ['ucode'])
self.assertIn('.ucode', syms)
syms = elf.GetSymbols(fname, ['missing'])
self.assertNotIn('.ucode', syms)
syms = elf.GetSymbols(fname, ['missing', 'ucode'])
self.assertIn('.ucode', syms)
def testMissingFile(self):
"""Test that a missing file is detected"""
entry = FakeEntry(10)
section = FakeSection()
with self.assertRaises(ValueError) as e:
syms = elf.LookupAndWriteSymbols('missing-file', entry, section)
self.assertIn("Filename 'missing-file' not found in input path",
str(e.exception))
def testOutsideFile(self):
"""Test a symbol which extends outside the entry area is detected"""
entry = FakeEntry(10)
section = FakeSection()
elf_fname = os.path.join(binman_dir, 'test', 'u_boot_binman_syms')
with self.assertRaises(ValueError) as e:
syms = elf.LookupAndWriteSymbols(elf_fname, entry, section)
self.assertIn('entry_path has offset 4 (size 8) but the contents size '
'is a', str(e.exception))
def testMissingImageStart(self):
"""Test that we detect a missing __image_copy_start symbol
This is needed to mark the start of the image. Without it we cannot
locate the offset of a binman symbol within the image.
"""
entry = FakeEntry(10)
section = FakeSection()
elf_fname = os.path.join(binman_dir, 'test', 'u_boot_binman_syms_bad')
self.assertEqual(elf.LookupAndWriteSymbols(elf_fname, entry, section),
None)
def testBadSymbolSize(self):
"""Test that an attempt to use an 8-bit symbol are detected
Only 32 and 64 bits are supported, since we need to store an offset
into the image.
"""
entry = FakeEntry(10)
section = FakeSection()
elf_fname = os.path.join(binman_dir, 'test', 'u_boot_binman_syms_size')
with self.assertRaises(ValueError) as e:
syms = elf.LookupAndWriteSymbols(elf_fname, entry, section)
self.assertIn('has size 1: only 4 and 8 are supported',
str(e.exception))
def testNoValue(self):
"""Test the case where we have no value for the symbol
This should produce -1 values for all thress symbols, taking up the
first 16 bytes of the image.
"""
entry = FakeEntry(20)
section = FakeSection(sym_value=None)
elf_fname = os.path.join(binman_dir, 'test', 'u_boot_binman_syms')
syms = elf.LookupAndWriteSymbols(elf_fname, entry, section)
self.assertEqual(chr(255) * 16 + 'a' * 4, entry.data)
def testDebug(self):
"""Check that enabling debug in the elf module produced debug output"""
elf.debug = True
entry = FakeEntry(20)
section = FakeSection()
elf_fname = os.path.join(binman_dir, 'test', 'u_boot_binman_syms')
with test_util.capture_sys_output() as (stdout, stderr):
syms = elf.LookupAndWriteSymbols(elf_fname, entry, section)
elf.debug = False
self.assertTrue(len(stdout.getvalue()) > 0)
if __name__ == '__main__':
unittest.main()
|
