def EnsureCompiled(fname, tmpdir=None, capture_stderr=False):
"""Compile an fdt .dts source file into a .dtb binary blob if needed.
Args:
fname: Filename (if .dts it will be compiled). It not it will be
left alone
tmpdir: Temporary directory for output files, or None to use the
tools-module output directory
Returns:
Filename of resulting .dtb file
"""
_, ext = os.path.splitext(fname)
if ext != '.dts':
return fname
if tmpdir:
dts_input = os.path.join(tmpdir, 'source.dts')
dtb_output = os.path.join(tmpdir, 'source.dtb')
else:
dts_input = tools.get_output_filename('source.dts')
dtb_output = tools.get_output_filename('source.dtb')
search_paths = [os.path.join(os.getcwd(), 'include')]
root, _ = os.path.splitext(fname)
cc, args = tools.get_target_compile_tool('cc')
args += ['-E', '-P', '-x', 'assembler-with-cpp', '-D__ASSEMBLY__']
args += ['-Ulinux']
for path in search_paths:
args.extend(['-I', path])
args += ['-o', dts_input, fname]
command.run(cc, *args)
# If we don't have a directory, put it in the tools tempdir
search_list = []
for path in search_paths:
search_list.extend(['-i', path])
dtc, args = tools.get_target_compile_tool('dtc')
args += [
'-I', 'dts', '-o', dtb_output, '-O', 'dtb', '-W',
'no-unit_address_vs_reg'
]
args.extend(search_list)
args.append(dts_input)
command.run(dtc, *args, capture_stderr=capture_stderr)
return dtb_output
def testMakeElf(self):
"""Test for the MakeElf function"""
outdir = tempfile.mkdtemp(prefix='elf.')
expected_text = b'1234'
expected_data = b'wxyz'
elf_fname = os.path.join(outdir, 'elf')
bin_fname = os.path.join(outdir, 'bin')
# Make an Elf file and then convert it to a fkat binary file. This
# should produce the original data.
elf.MakeElf(elf_fname, expected_text, expected_data)
objcopy, args = tools.get_target_compile_tool('objcopy')
args += ['-O', 'binary', elf_fname, bin_fname]
stdout = command.output(objcopy, *args)
with open(bin_fname, 'rb') as fd:
data = fd.read()
self.assertEqual(expected_text + expected_data, data)
shutil.rmtree(outdir)
def MakeElf(elf_fname, text, data):
"""Make an elf file with the given data in a single section
The output file has a several section including '.text' and '.data',
containing the info provided in arguments.
Args:
elf_fname: Output filename
text: Text (code) to put in the file's .text section
data: Data to put in the file's .data section
"""
outdir = tempfile.mkdtemp(prefix='binman.elf.')
s_file = os.path.join(outdir, 'elf.S')
# Spilt the text into two parts so that we can make the entry point two
# bytes after the start of the text section
text_bytes1 = ['\t.byte\t%#x' % byte for byte in text[:2]]
text_bytes2 = ['\t.byte\t%#x' % byte for byte in text[2:]]
data_bytes = ['\t.byte\t%#x' % byte for byte in data]
with open(s_file, 'w') as fd:
print(
'''/* Auto-generated C program to produce an ELF file for testing */
.section .text
.code32
.globl _start
.type _start, @function
%s
_start:
%s
.ident "comment"
.comm fred,8,4
.section .empty
.globl _empty
_empty:
.byte 1
.globl ernie
.data
.type ernie, @object
.size ernie, 4
ernie:
%s
''' % ('\n'.join(text_bytes1), '\n'.join(text_bytes2), '\n'.join(data_bytes)),
file=fd)
lds_file = os.path.join(outdir, 'elf.lds')
# Use a linker script to set the alignment and text address.
with open(lds_file, 'w') as fd:
print(
'''/* Auto-generated linker script to produce an ELF file for testing */
PHDRS
{
text PT_LOAD ;
data PT_LOAD ;
empty PT_LOAD FLAGS ( 6 ) ;
note PT_NOTE ;
}
SECTIONS
{
. = 0xfef20000;
ENTRY(_start)
.text . : SUBALIGN(0)
{
*(.text)
} :text
.data : {
*(.data)
} :data
_bss_start = .;
.empty : {
*(.empty)
} :empty
/DISCARD/ : {
*(.note.gnu.property)
}
.note : {
*(.comment)
} :note
.bss _bss_start (OVERLAY) : {
*(.bss)
}
}
''',
file=fd)
# -static: Avoid requiring any shared libraries
# -nostdlib: Don't link with C library
# -Wl,--build-id=none: Don't generate a build ID, so that we just get the
# text section at the start
# -m32: Build for 32-bit x86
# -T...: Specifies the link script, which sets the start address
cc, args = tools.get_target_compile_tool('cc')
args += [
'-static', '-nostdlib', '-Wl,--build-id=none', '-m32', '-T', lds_file,
'-o', elf_fname, s_file
]
stdout = command.output(cc, *args)
shutil.rmtree(outdir)