1 # SPDX-License-Identifier: GPL-2.0+
2 # Copyright (c) 2017 Google, Inc
3 # Written by Simon Glass <sjg@chromium.org>
5 # Test for the elf module
19 binman_dir = os.path.dirname(os.path.realpath(sys.argv[0]))
23 """A fake Entry object, usedfor testing
25 This supports an entry with a given size.
27 def __init__(self, contents_size):
28 self.contents_size = contents_size
29 self.data = tools.GetBytes(ord('a'), contents_size)
36 """A fake Section object, used for testing
38 This has the minimum feature set needed to support testing elf functions.
39 A LookupSymbol() function is provided which returns a fake value for amu
42 def __init__(self, sym_value=1):
43 self.sym_value = sym_value
48 def LookupSymbol(self, name, weak, msg):
49 """Fake implementation which returns the same value for all symbols"""
53 def BuildElfTestFiles(target_dir):
54 """Build ELF files used for testing in binman
56 This compiles and links the test files into the specified directory. It the
57 Makefile and source files in the binman test/ directory.
60 target_dir: Directory to put the files into
62 if not os.path.exists(target_dir):
64 testdir = os.path.join(binman_dir, 'test')
66 # If binman is involved from the main U-Boot Makefile the -r and -R
67 # flags are set in MAKEFLAGS. This prevents this Makefile from working
68 # correctly. So drop any make flags here.
69 if 'MAKEFLAGS' in os.environ:
70 del os.environ['MAKEFLAGS']
71 tools.Run('make', '-C', target_dir, '-f',
72 os.path.join(testdir, 'Makefile'), 'SRC=%s/' % testdir,
73 'bss_data', 'u_boot_ucode_ptr', 'u_boot_no_ucode_ptr')
76 class TestElf(unittest.TestCase):
79 cls._indir = tempfile.mkdtemp(prefix='elf.')
80 tools.SetInputDirs(['.'])
81 BuildElfTestFiles(cls._indir)
84 def tearDownClass(cls):
86 shutil.rmtree(cls._indir)
89 def ElfTestFile(cls, fname):
90 return os.path.join(cls._indir, fname)
92 def testAllSymbols(self):
93 """Test that we can obtain a symbol from the ELF file"""
94 fname = self.ElfTestFile('u_boot_ucode_ptr')
95 syms = elf.GetSymbols(fname, [])
96 self.assertIn('.ucode', syms)
98 def testRegexSymbols(self):
99 """Test that we can obtain from the ELF file by regular expression"""
100 fname = self.ElfTestFile('u_boot_ucode_ptr')
101 syms = elf.GetSymbols(fname, ['ucode'])
102 self.assertIn('.ucode', syms)
103 syms = elf.GetSymbols(fname, ['missing'])
104 self.assertNotIn('.ucode', syms)
105 syms = elf.GetSymbols(fname, ['missing', 'ucode'])
106 self.assertIn('.ucode', syms)
108 def testMissingFile(self):
109 """Test that a missing file is detected"""
110 entry = FakeEntry(10)
111 section = FakeSection()
112 with self.assertRaises(ValueError) as e:
113 syms = elf.LookupAndWriteSymbols('missing-file', entry, section)
114 self.assertIn("Filename 'missing-file' not found in input path",
117 def testOutsideFile(self):
118 """Test a symbol which extends outside the entry area is detected"""
119 entry = FakeEntry(10)
120 section = FakeSection()
121 elf_fname = os.path.join(binman_dir, 'test', 'u_boot_binman_syms')
122 with self.assertRaises(ValueError) as e:
123 syms = elf.LookupAndWriteSymbols(elf_fname, entry, section)
124 self.assertIn('entry_path has offset 4 (size 8) but the contents size '
125 'is a', str(e.exception))
127 def testMissingImageStart(self):
128 """Test that we detect a missing __image_copy_start symbol
130 This is needed to mark the start of the image. Without it we cannot
131 locate the offset of a binman symbol within the image.
133 entry = FakeEntry(10)
134 section = FakeSection()
135 elf_fname = os.path.join(binman_dir, 'test', 'u_boot_binman_syms_bad')
136 self.assertEqual(elf.LookupAndWriteSymbols(elf_fname, entry, section),
139 def testBadSymbolSize(self):
140 """Test that an attempt to use an 8-bit symbol are detected
142 Only 32 and 64 bits are supported, since we need to store an offset
145 entry = FakeEntry(10)
146 section = FakeSection()
147 elf_fname = os.path.join(binman_dir, 'test', 'u_boot_binman_syms_size')
148 with self.assertRaises(ValueError) as e:
149 syms = elf.LookupAndWriteSymbols(elf_fname, entry, section)
150 self.assertIn('has size 1: only 4 and 8 are supported',
153 def testNoValue(self):
154 """Test the case where we have no value for the symbol
156 This should produce -1 values for all thress symbols, taking up the
157 first 16 bytes of the image.
159 entry = FakeEntry(20)
160 section = FakeSection(sym_value=None)
161 elf_fname = os.path.join(binman_dir, 'test', 'u_boot_binman_syms')
162 syms = elf.LookupAndWriteSymbols(elf_fname, entry, section)
163 self.assertEqual(tools.GetBytes(255, 16) + tools.GetBytes(ord('a'), 4),
167 """Check that enabling debug in the elf module produced debug output"""
169 tout.Init(tout.DEBUG)
170 entry = FakeEntry(20)
171 section = FakeSection()
172 elf_fname = os.path.join(binman_dir, 'test', 'u_boot_binman_syms')
173 with test_util.capture_sys_output() as (stdout, stderr):
174 syms = elf.LookupAndWriteSymbols(elf_fname, entry, section)
175 self.assertTrue(len(stdout.getvalue()) > 0)
177 tout.Init(tout.WARNING)
179 def testMakeElf(self):
180 """Test for the MakeElf function"""
181 outdir = tempfile.mkdtemp(prefix='elf.')
182 expected_text = b'1234'
183 expected_data = b'wxyz'
184 elf_fname = os.path.join(outdir, 'elf')
185 bin_fname = os.path.join(outdir, 'bin')
187 # Make an Elf file and then convert it to a fkat binary file. This
188 # should produce the original data.
189 elf.MakeElf(elf_fname, expected_text, expected_data)
190 stdout = command.Output('objcopy', '-O', 'binary', elf_fname, bin_fname)
191 with open(bin_fname, 'rb') as fd:
193 self.assertEqual(expected_text + expected_data, data)
194 shutil.rmtree(outdir)
196 def testDecodeElf(self):
197 """Test for the MakeElf function"""
198 if not elf.ELF_TOOLS:
199 self.skipTest('Python elftools not available')
200 outdir = tempfile.mkdtemp(prefix='elf.')
201 expected_text = b'1234'
202 expected_data = b'wxyz'
203 elf_fname = os.path.join(outdir, 'elf')
204 elf.MakeElf(elf_fname, expected_text, expected_data)
205 data = tools.ReadFile(elf_fname)
209 expected = expected_text + expected_data
210 self.assertEqual(elf.ElfInfo(expected, load, entry, len(expected)),
211 elf.DecodeElf(data, 0))
212 self.assertEqual(elf.ElfInfo(b'\0\0' + expected[2:],
213 load, entry, len(expected)),
214 elf.DecodeElf(data, load + 2))
215 shutil.rmtree(outdir)
218 if __name__ == '__main__':