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