elf_test.py
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#
# Copyright (c) 2017 Google, Inc
# Written by Simon Glass <sjg@chromium.org>
#
# SPDX-License-Identifier: GPL-2.0+
#
# Test for the elf module
from contextlib import contextmanager
import os
import sys
import unittest
try:
from StringIO import StringIO
except ImportError:
from io import StringIO
import elf
binman_dir = os.path.dirname(os.path.realpath(sys.argv[0]))
# Use this to suppress stdout/stderr output:
# with capture_sys_output() as (stdout, stderr)
# ...do something...
@contextmanager
def capture_sys_output():
capture_out, capture_err = StringIO(), StringIO()
old_out, old_err = sys.stdout, sys.stderr
try:
sys.stdout, sys.stderr = capture_out, capture_err
yield capture_out, capture_err
finally:
sys.stdout, sys.stderr = old_out, old_err
class FakeEntry:
def __init__(self, contents_size):
self.contents_size = contents_size
self.data = 'a' * contents_size
def GetPath(self):
return 'entry_path'
class FakeImage:
def __init__(self, sym_value=1):
self.sym_value = sym_value
def GetPath(self):
return 'image_path'
def LookupSymbol(self, name, weak, msg):
return self.sym_value
class TestElf(unittest.TestCase):
def testAllSymbols(self):
fname = os.path.join(binman_dir, 'test', 'u_boot_ucode_ptr')
syms = elf.GetSymbols(fname, [])
self.assertIn('.ucode', syms)
def testRegexSymbols(self):
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):
entry = FakeEntry(10)
image = FakeImage()
with self.assertRaises(ValueError) as e:
syms = elf.LookupAndWriteSymbols('missing-file', entry, image)
self.assertIn("Filename 'missing-file' not found in input path",
str(e.exception))
def testOutsideFile(self):
entry = FakeEntry(10)
image = FakeImage()
elf_fname = os.path.join(binman_dir, 'test', 'u_boot_binman_syms')
with self.assertRaises(ValueError) as e:
syms = elf.LookupAndWriteSymbols(elf_fname, entry, image)
self.assertIn('entry_path has offset 4 (size 8) but the contents size '
'is a', str(e.exception))
def testMissingImageStart(self):
entry = FakeEntry(10)
image = FakeImage()
elf_fname = os.path.join(binman_dir, 'test', 'u_boot_binman_syms_bad')
self.assertEqual(elf.LookupAndWriteSymbols(elf_fname, entry, image),
None)
def testBadSymbolSize(self):
entry = FakeEntry(10)
image = FakeImage()
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, image)
self.assertIn('has size 1: only 4 and 8 are supported',
str(e.exception))
def testNoValue(self):
entry = FakeEntry(20)
image = FakeImage(sym_value=None)
elf_fname = os.path.join(binman_dir, 'test', 'u_boot_binman_syms')
syms = elf.LookupAndWriteSymbols(elf_fname, entry, image)
self.assertEqual(chr(255) * 16 + 'a' * 4, entry.data)
def testDebug(self):
elf.debug = True
entry = FakeEntry(20)
image = FakeImage()
elf_fname = os.path.join(binman_dir, 'test', 'u_boot_binman_syms')
with capture_sys_output() as (stdout, stderr):
syms = elf.LookupAndWriteSymbols(elf_fname, entry, image)
elf.debug = False
self.assertTrue(len(stdout.getvalue()) > 0)
if __name__ == '__main__':
unittest.main()