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binman: Support splitting an ELF file into multiple nodes

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Some boards need to load an ELF file using the 'loadables' property, but
the file has segments at different memory addresses. This means that it
cannot be supplied as a flat binary.

Allow generating a separate node in the FIT for each segment in the ELF,
with a different load address for each.

Also add checks that the fit,xxx directives are valid.

Signed-off-by: Simon Glass <sjg@chromium.org>
Acked-by: Alper Nebi Yasak <alpernebiyasak@gmail.com>
This commit is contained in:
Simon Glass 2022-03-05 20:19:12 -07:00
parent 2337eca283
commit 40c8bdd87e
6 changed files with 597 additions and 10 deletions
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146
tools/binman/entries.rst
View file

@ -612,6 +612,9 @@ gen-fdt-nodes
Generate FDT nodes as above. This is the default if there is no
`fit,operation` property.
split-elf
Split an ELF file into a separate node for each segment.
Generating nodes from an FDT list (gen-fdt-nodes)
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
@ -655,6 +658,149 @@ for each of your two files.
Note that if no devicetree files are provided (with '-a of-list' as above)
then no nodes will be generated.
Generating nodes from an ELF file (split-elf)
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
This uses the node as a template to generate multiple nodes. The following
special properties are available:
split-elf
Split an ELF file into a separate node for each segment. This uses the
node as a template to generate multiple nodes. The following special
properties are available:
fit,load
Generates a `load = <...>` property with the load address of the
segment
fit,entry
Generates a `entry = <...>` property with the entry address of the
ELF. This is only produced for the first entry
fit,data
Generates a `data = <...>` property with the contents of the segment
fit,loadables
Generates a `loadable = <...>` property with a list of the generated
nodes (including all nodes if this operation is used multiple times)
Here is an example showing ATF, TEE and a device tree all combined::
fit {
description = "test-desc";
#address-cells = <1>;
fit,fdt-list = "of-list";
images {
u-boot {
description = "U-Boot (64-bit)";
type = "standalone";
os = "U-Boot";
arch = "arm64";
compression = "none";
load = <CONFIG_SYS_TEXT_BASE>;
u-boot-nodtb {
};
};
@fdt-SEQ {
description = "fdt-NAME.dtb";
type = "flat_dt";
compression = "none";
};
@atf-SEQ {
fit,operation = "split-elf";
description = "ARM Trusted Firmware";
type = "firmware";
arch = "arm64";
os = "arm-trusted-firmware";
compression = "none";
fit,load;
fit,entry;
fit,data;
atf-bl31 {
};
};
@tee-SEQ {
fit,operation = "split-elf";
description = "TEE";
type = "tee";
arch = "arm64";
os = "tee";
compression = "none";
fit,load;
fit,entry;
fit,data;
tee-os {
};
};
};
configurations {
default = "@config-DEFAULT-SEQ";
@config-SEQ {
description = "conf-NAME.dtb";
fdt = "fdt-SEQ";
firmware = "u-boot";
fit,loadables;
};
};
};
If ATF-BL31 is available, this generates a node for each segment in the
ELF file, for example::
images {
atf-1 {
data = <...contents of first segment...>;
data-offset = <0x00000000>;
entry = <0x00040000>;
load = <0x00040000>;
compression = "none";
os = "arm-trusted-firmware";
arch = "arm64";
type = "firmware";
description = "ARM Trusted Firmware";
};
atf-2 {
data = <...contents of second segment...>;
load = <0xff3b0000>;
compression = "none";
os = "arm-trusted-firmware";
arch = "arm64";
type = "firmware";
description = "ARM Trusted Firmware";
};
};
The same applies for OP-TEE if that is available.
If each binary is not available, the relevant template node (@atf-SEQ or
@tee-SEQ) is removed from the output.
This also generates a `config-xxx` node for each device tree in `of-list`.
Note that the U-Boot build system uses `-a of-list=$(CONFIG_OF_LIST)`
so you can use `CONFIG_OF_LIST` to define that list. In this example it is
set up for `firefly-rk3399` with a single device tree and the default set
with `-a default-dt=$(CONFIG_DEFAULT_DEVICE_TREE)`, so the resulting output
is::
configurations {
default = "config-1";
config-1 {
loadables = "atf-1", "atf-2", "atf-3", "tee-1", "tee-2";
description = "rk3399-firefly.dtb";
fdt = "fdt-1";
firmware = "u-boot";
};
};
U-Boot SPL can then load the firmware (U-Boot proper) and all the loadables
(ATF and TEE), then proceed with the boot.
Entry: fmap: An entry which contains an Fmap section

219
tools/binman/etype/fit.py
View file

@ -9,14 +9,16 @@ import libfdt
from binman.entry import Entry, EntryArg
from binman.etype.section import Entry_section
from binman import elf
from dtoc import fdt_util
from dtoc.fdt import Fdt
from patman import tools
# Supported operations, with the fit,operation property
OP_GEN_FDT_NODES = range(1)
OP_GEN_FDT_NODES, OP_SPLIT_ELF = range(2)
OPERATIONS = {
'gen-fdt-nodes': OP_GEN_FDT_NODES,
'split-elf': OP_SPLIT_ELF,
}
class Entry_fit(Entry_section):
@ -112,6 +114,9 @@ class Entry_fit(Entry_section):
Generate FDT nodes as above. This is the default if there is no
`fit,operation` property.
split-elf
Split an ELF file into a separate node for each segment.
Generating nodes from an FDT list (gen-fdt-nodes)
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
@ -154,6 +159,149 @@ class Entry_fit(Entry_section):
Note that if no devicetree files are provided (with '-a of-list' as above)
then no nodes will be generated.
Generating nodes from an ELF file (split-elf)
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
This uses the node as a template to generate multiple nodes. The following
special properties are available:
split-elf
Split an ELF file into a separate node for each segment. This uses the
node as a template to generate multiple nodes. The following special
properties are available:
fit,load
Generates a `load = <...>` property with the load address of the
segment
fit,entry
Generates a `entry = <...>` property with the entry address of the
ELF. This is only produced for the first entry
fit,data
Generates a `data = <...>` property with the contents of the segment
fit,loadables
Generates a `loadable = <...>` property with a list of the generated
nodes (including all nodes if this operation is used multiple times)
Here is an example showing ATF, TEE and a device tree all combined::
fit {
description = "test-desc";
#address-cells = <1>;
fit,fdt-list = "of-list";
images {
u-boot {
description = "U-Boot (64-bit)";
type = "standalone";
os = "U-Boot";
arch = "arm64";
compression = "none";
load = <CONFIG_SYS_TEXT_BASE>;
u-boot-nodtb {
};
};
@fdt-SEQ {
description = "fdt-NAME.dtb";
type = "flat_dt";
compression = "none";
};
@atf-SEQ {
fit,operation = "split-elf";
description = "ARM Trusted Firmware";
type = "firmware";
arch = "arm64";
os = "arm-trusted-firmware";
compression = "none";
fit,load;
fit,entry;
fit,data;
atf-bl31 {
};
};
@tee-SEQ {
fit,operation = "split-elf";
description = "TEE";
type = "tee";
arch = "arm64";
os = "tee";
compression = "none";
fit,load;
fit,entry;
fit,data;
tee-os {
};
};
};
configurations {
default = "@config-DEFAULT-SEQ";
@config-SEQ {
description = "conf-NAME.dtb";
fdt = "fdt-SEQ";
firmware = "u-boot";
fit,loadables;
};
};
};
If ATF-BL31 is available, this generates a node for each segment in the
ELF file, for example::
images {
atf-1 {
data = <...contents of first segment...>;
data-offset = <0x00000000>;
entry = <0x00040000>;
load = <0x00040000>;
compression = "none";
os = "arm-trusted-firmware";
arch = "arm64";
type = "firmware";
description = "ARM Trusted Firmware";
};
atf-2 {
data = <...contents of second segment...>;
load = <0xff3b0000>;
compression = "none";
os = "arm-trusted-firmware";
arch = "arm64";
type = "firmware";
description = "ARM Trusted Firmware";
};
};
The same applies for OP-TEE if that is available.
If each binary is not available, the relevant template node (@atf-SEQ or
@tee-SEQ) is removed from the output.
This also generates a `config-xxx` node for each device tree in `of-list`.
Note that the U-Boot build system uses `-a of-list=$(CONFIG_OF_LIST)`
so you can use `CONFIG_OF_LIST` to define that list. In this example it is
set up for `firefly-rk3399` with a single device tree and the default set
with `-a default-dt=$(CONFIG_DEFAULT_DEVICE_TREE)`, so the resulting output
is::
configurations {
default = "config-1";
config-1 {
loadables = "atf-1", "atf-2", "atf-3", "tee-1", "tee-2";
description = "rk3399-firefly.dtb";
fdt = "fdt-1";
firmware = "u-boot";
};
};
U-Boot SPL can then load the firmware (U-Boot proper) and all the loadables
(ATF and TEE), then proceed with the boot.
"""
def __init__(self, section, etype, node):
"""
@ -167,6 +315,7 @@ class Entry_fit(Entry_section):
entries which are used to create the FIT, but should not be
processed as real entries. This is set up once we have the
entries
_loadables: List of generated split-elf nodes, each a node name
"""
super().__init__(section, etype, node)
self._fit = None
@ -174,6 +323,7 @@ class Entry_fit(Entry_section):
self._fdts = None
self.mkimage = None
self._priv_entries = {}
self._loadables = []
def ReadNode(self):
super().ReadNode()
@ -337,7 +487,7 @@ class Entry_fit(Entry_section):
return
fsw.property(pname, prop.bytes)
def _gen_fdt_nodes(node, depth, in_images):
def _gen_fdt_nodes(base_node, node, depth, in_images):
"""Generate FDT nodes
This creates one node for each member of self._fdts using the
@ -359,6 +509,15 @@ class Entry_fit(Entry_section):
fname = tools.get_input_filename(fdt_fname + '.dtb')
with fsw.add_node(node_name):
for pname, prop in node.props.items():
if pname == 'fit,loadables':
val = '\0'.join(self._loadables) + '\0'
fsw.property('loadables', val.encode('utf-8'))
elif pname == 'fit,operation':
pass
elif pname.startswith('fit,'):
self._raise_subnode(
node, f"Unknown directive '{pname}'")
else:
val = prop.bytes.replace(
b'NAME', tools.to_bytes(fdt_fname))
val = val.replace(
@ -380,7 +539,43 @@ class Entry_fit(Entry_section):
else:
self.Raise("Generator node requires 'fit,fdt-list' property")
def _gen_node(base_node, node, depth, in_images):
def _gen_split_elf(base_node, node, elf_data, missing):
"""Add nodes for the ELF file, one per group of contiguous segments
Args:
base_node (Node): Template node from the binman definition
node (Node): Node to replace (in the FIT being built)
data (bytes): ELF-format data to process (may be empty)
missing (bool): True if any of the data is missing
"""
# If any pieces are missing, skip this. The missing entries will
# show an error
if not missing:
try:
segments, entry = elf.read_loadable_segments(elf_data)
except ValueError as exc:
self._raise_subnode(node,
f'Failed to read ELF file: {str(exc)}')
for (seq, start, data) in segments:
node_name = node.name[1:].replace('SEQ', str(seq + 1))
with fsw.add_node(node_name):
loadables.append(node_name)
for pname, prop in node.props.items():
if not pname.startswith('fit,'):
fsw.property(pname, prop.bytes)
elif pname == 'fit,load':
fsw.property_u32('load', start)
elif pname == 'fit,entry':
if seq == 0:
fsw.property_u32('entry', entry)
elif pname == 'fit,data':
fsw.property('data', bytes(data))
elif pname != 'fit,operation':
self._raise_subnode(
node, f"Unknown directive '{pname}'")
def _gen_node(base_node, node, depth, in_images, entry):
"""Generate nodes from a template
This creates one node for each member of self._fdts using the
@ -399,7 +594,18 @@ class Entry_fit(Entry_section):
"""
oper = self._get_operation(base_node, node)
if oper == OP_GEN_FDT_NODES:
_gen_fdt_nodes(node, depth, in_images)
_gen_fdt_nodes(base_node, node, depth, in_images)
elif oper == OP_SPLIT_ELF:
# Entry_section.ObtainContents() either returns True or
# raises an exception.
data = None
missing_list = []
entry.ObtainContents()
entry.Pack(0)
data = entry.GetData()
entry.CheckMissing(missing_list)
_gen_split_elf(base_node, node, data, bool(missing_list))
def _add_node(base_node, depth, node):
"""Add nodes to the output FIT
@ -437,7 +643,8 @@ class Entry_fit(Entry_section):
# fsw.add_node() or _add_node() for it.
pass
elif self.GetImage().generate and subnode.name.startswith('@'):
_gen_node(base_node, subnode, depth, in_images)
entry = self._priv_entries.get(subnode_path)
_gen_node(base_node, subnode, depth, in_images, entry)
# This is a generator (template) entry, so remove it from
# the list of entries used by PackEntries(), etc. Otherwise
# it will appear in the binman output
@ -451,8 +658,10 @@ class Entry_fit(Entry_section):
fsw = libfdt.FdtSw()
fsw.finish_reservemap()
to_remove = []
loadables = []
with fsw.add_node(''):
_add_node(self._node, 0, self._node)
self._loadables = loadables
fdt = fsw.as_fdt()
# Remove generator entries from the main list

147
tools/binman/ftest.py
View file

@ -202,6 +202,13 @@ class TestFunctional(unittest.TestCase):
TestFunctional._MakeInputFile('env.txt', ENV_DATA)
# ELF file with two sections in different parts of memory, used for both
# ATF and OP_TEE
TestFunctional._MakeInputFile('bl31.elf',
tools.read_file(cls.ElfTestFile('elf_sections')))
TestFunctional._MakeInputFile('tee.elf',
tools.read_file(cls.ElfTestFile('elf_sections')))
cls.have_lz4 = comp_util.HAVE_LZ4
@classmethod
@ -5324,6 +5331,146 @@ fdt fdtmap Extract the devicetree blob from the fdtmap
err,
"Image '.*' has faked external blobs and is non-functional: .*")
def testFitSplitElf(self):
"""Test an image with an FIT with an split-elf operation"""
entry_args = {
'of-list': 'test-fdt1 test-fdt2',
'default-dt': 'test-fdt2',
'atf-bl31-path': 'bl31.elf',
'tee-os-path': 'tee.elf',
}
test_subdir = os.path.join(self._indir, TEST_FDT_SUBDIR)
data = self._DoReadFileDtb(
'226_fit_split_elf.dts',
entry_args=entry_args,
extra_indirs=[test_subdir])[0]
self.assertEqual(U_BOOT_NODTB_DATA, data[-len(U_BOOT_NODTB_DATA):])
fit_data = data[len(U_BOOT_DATA):-len(U_BOOT_NODTB_DATA)]
base_keys = {'description', 'type', 'arch', 'os', 'compression',
'data', 'load'}
dtb = fdt.Fdt.FromData(fit_data)
dtb.Scan()
elf_data = tools.read_file(os.path.join(self._indir, 'bl31.elf'))
segments, entry = elf.read_loadable_segments(elf_data)
# We assume there are two segments
self.assertEquals(2, len(segments))
atf1 = dtb.GetNode('/images/atf-1')
_, start, data = segments[0]
self.assertEqual(base_keys | {'entry'}, atf1.props.keys())
self.assertEqual(entry,
fdt_util.fdt32_to_cpu(atf1.props['entry'].value))
self.assertEqual(start,
fdt_util.fdt32_to_cpu(atf1.props['load'].value))
self.assertEqual(data, atf1.props['data'].bytes)
atf2 = dtb.GetNode('/images/atf-2')
self.assertEqual(base_keys, atf2.props.keys())
_, start, data = segments[1]
self.assertEqual(start,
fdt_util.fdt32_to_cpu(atf2.props['load'].value))
self.assertEqual(data, atf2.props['data'].bytes)
conf = dtb.GetNode('/configurations')
self.assertEqual({'default'}, conf.props.keys())
for subnode in conf.subnodes:
self.assertEqual({'description', 'fdt', 'loadables'},
subnode.props.keys())
self.assertEqual(
['atf-1', 'atf-2', 'tee-1', 'tee-2'],
fdt_util.GetStringList(subnode, 'loadables'))
def _check_bad_fit(self, dts):
"""Check a bad FIT
This runs with the given dts and returns the assertion raised
Args:
dts (str): dts filename to use
Returns:
str: Assertion string raised
"""
entry_args = {
'of-list': 'test-fdt1 test-fdt2',
'default-dt': 'test-fdt2',
'atf-bl31-path': 'bl31.elf',
'tee-os-path': 'tee.elf',
}
test_subdir = os.path.join(self._indir, TEST_FDT_SUBDIR)
with self.assertRaises(ValueError) as exc:
self._DoReadFileDtb(dts, entry_args=entry_args,
extra_indirs=[test_subdir])[0]
return str(exc.exception)
def testFitSplitElfBadElf(self):
"""Test a FIT split-elf operation with an invalid ELF file"""
TestFunctional._MakeInputFile('bad.elf', tools.get_bytes(100, 100))
entry_args = {
'of-list': 'test-fdt1 test-fdt2',
'default-dt': 'test-fdt2',
'atf-bl31-path': 'bad.elf',
'tee-os-path': 'tee.elf',
}
test_subdir = os.path.join(self._indir, TEST_FDT_SUBDIR)
with self.assertRaises(ValueError) as exc:
self._DoReadFileDtb(
'226_fit_split_elf.dts',
entry_args=entry_args,
extra_indirs=[test_subdir])[0]
self.assertIn(
"Node '/binman/fit': subnode 'images/@atf-SEQ': Failed to read ELF file: Magic number does not match",
str(exc.exception))
def testFitSplitElfBadDirective(self):
"""Test a FIT split-elf invalid fit,xxx directive in an image node"""
err = self._check_bad_fit('227_fit_bad_dir.dts')
self.assertIn(
"Node '/binman/fit': subnode 'images/@atf-SEQ': Unknown directive 'fit,something'",
err)
def testFitSplitElfBadDirectiveConfig(self):
"""Test a FIT split-elf with invalid fit,xxx directive in config"""
err = self._check_bad_fit('228_fit_bad_dir_config.dts')
self.assertEqual(
"Node '/binman/fit': subnode 'configurations/@config-SEQ': Unknown directive 'fit,config'",
err)
def checkFitSplitElf(self, **kwargs):
"""Test an split-elf FIT with a missing ELF file"""
entry_args = {
'of-list': 'test-fdt1 test-fdt2',
'default-dt': 'test-fdt2',
'atf-bl31-path': 'bl31.elf',
'tee-os-path': 'missing.elf',
}
test_subdir = os.path.join(self._indir, TEST_FDT_SUBDIR)
with test_util.capture_sys_output() as (stdout, stderr):
self._DoTestFile(
'226_fit_split_elf.dts', entry_args=entry_args,
extra_indirs=[test_subdir], **kwargs)
err = stderr.getvalue()
return err
def testFitSplitElfMissing(self):
"""Test an split-elf FIT with a missing ELF file"""
err = self.checkFitSplitElf(allow_missing=True)
self.assertRegex(
err,
"Image '.*' is missing external blobs and is non-functional: .*")
def testFitSplitElfFaked(self):
"""Test an split-elf FIT with faked ELF file"""
err = self.checkFitSplitElf(allow_missing=True, allow_fake_blobs=True)
self.assertRegex(
err,
"Image '.*' is missing external blobs and is non-functional: .*")
if __name__ == "__main__":
unittest.main()

67
tools/binman/test/226_fit_split_elf.dts Normal file
View file

@ -0,0 +1,67 @@
// SPDX-License-Identifier: GPL-2.0+
/dts-v1/;
/ {
#address-cells = <1>;
#size-cells = <1>;
binman {
u-boot {
};
fit {
description = "test-desc";
#address-cells = <1>;
fit,fdt-list = "of-list";
images {
@fdt-SEQ {
description = "fdt-NAME.dtb";
type = "flat_dt";
compression = "none";
};
atf: @atf-SEQ {
fit,operation = "split-elf";
description = "ARM Trusted Firmware";
type = "firmware";
arch = "arm64";
os = "arm-trusted-firmware";
compression = "none";
fit,load;
fit,entry;
fit,data;
atf-bl31 {
};
};
@tee-SEQ {
fit,operation = "split-elf";
description = "TEE";
type = "tee";
arch = "arm64";
os = "tee";
compression = "none";
fit,load;
fit,entry;
fit,data;
tee-os {
};
};
};
configurations {
default = "@config-DEFAULT-SEQ";
config: @config-SEQ {
description = "conf-NAME.dtb";
fdt = "fdt-SEQ";
fit,loadables;
};
};
};
u-boot-nodtb {
};
};
};

9
tools/binman/test/227_fit_bad_dir.dts Normal file
View file

@ -0,0 +1,9 @@
// SPDX-License-Identifier: GPL-2.0+
/dts-v1/;
#include "226_fit_split_elf.dts"
&atf {
fit,something = "bad";
};

9
tools/binman/test/228_fit_bad_dir_config.dts Normal file
View file

@ -0,0 +1,9 @@
// SPDX-License-Identifier: GPL-2.0+
/dts-v1/;
#include "226_fit_split_elf.dts"
&config {
fit,config = "bad";
};