326 lines
11 KiB
Python
Executable File
326 lines
11 KiB
Python
Executable File
#!/usr/bin/env python3
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#
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# Copyright (c) 2017 Intel Corporation
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# Copyright (c) 2020 Nordic Semiconductor NA
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#
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# SPDX-License-Identifier: Apache-2.0
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"""Translate generic handles into ones optimized for the application.
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Immutable device data includes information about dependencies,
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e.g. that a particular sensor is controlled through a specific I2C bus
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and that it signals event on a pin on a specific GPIO controller.
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This information is encoded in the first-pass binary using identifiers
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derived from the devicetree. This script extracts those identifiers
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and replaces them with ones optimized for use with the devices
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actually present.
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For example the sensor might have a first-pass handle defined by its
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devicetree ordinal 52, with the I2C driver having ordinal 24 and the
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GPIO controller ordinal 14. The runtime ordinal is the index of the
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corresponding device in the static devicetree array, which might be 6,
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5, and 3, respectively.
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The output is a C source file that provides alternative definitions
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for the array contents referenced from the immutable device objects.
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In the final link these definitions supersede the ones in the
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driver-specific object file.
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"""
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import sys
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import argparse
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import os
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import struct
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import pickle
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from distutils.version import LooseVersion
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import elftools
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from elftools.elf.elffile import ELFFile
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from elftools.elf.sections import SymbolTableSection
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import elftools.elf.enums
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if LooseVersion(elftools.__version__) < LooseVersion('0.24'):
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sys.exit("pyelftools is out of date, need version 0.24 or later")
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scr = os.path.basename(sys.argv[0])
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def debug(text):
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if not args.verbose:
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return
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sys.stdout.write(scr + ": " + text + "\n")
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def parse_args():
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global args
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parser = argparse.ArgumentParser(
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description=__doc__,
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formatter_class=argparse.RawDescriptionHelpFormatter)
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parser.add_argument("-k", "--kernel", required=True,
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help="Input zephyr ELF binary")
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parser.add_argument("-o", "--output-source", required=True,
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help="Output source file")
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parser.add_argument("-v", "--verbose", action="store_true",
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help="Print extra debugging information")
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parser.add_argument("-z", "--zephyr-base",
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help="Path to current Zephyr base. If this argument \
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is not provided the environment will be checked for \
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the ZEPHYR_BASE environment variable.")
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args = parser.parse_args()
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if "VERBOSE" in os.environ:
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args.verbose = 1
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ZEPHYR_BASE = args.zephyr_base or os.getenv("ZEPHYR_BASE")
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if ZEPHYR_BASE is None:
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sys.exit("-z / --zephyr-base not provided. Please provide "
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"--zephyr-base or set ZEPHYR_BASE in environment")
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sys.path.insert(0, os.path.join(ZEPHYR_BASE, "scripts/dts"))
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def symbol_data(elf, sym):
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addr = sym.entry.st_value
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len = sym.entry.st_size
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for section in elf.iter_sections():
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start = section['sh_addr']
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end = start + section['sh_size']
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if (start <= addr) and (addr + len) <= end:
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offset = addr - section['sh_addr']
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return bytes(section.data()[offset:offset + len])
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def symbol_handle_data(elf, sym):
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data = symbol_data(elf, sym)
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if data:
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format = "<" if elf.little_endian else ">"
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format += "%uh" % (len(data) / 2)
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return struct.unpack(format, data)
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# These match the corresponding constants in <device.h>
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DEVICE_HANDLE_SEP = -32768
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DEVICE_HANDLE_ENDS = 32767
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def handle_name(hdl):
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if hdl == DEVICE_HANDLE_SEP:
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return "DEVICE_HANDLE_SEP"
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if hdl == DEVICE_HANDLE_ENDS:
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return "DEVICE_HANDLE_ENDS"
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if hdl == 0:
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return "DEVICE_HANDLE_NULL"
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return str(int(hdl))
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class Device:
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"""
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Represents information about a device object and its references to other objects.
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"""
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def __init__(self, elf, ld_constants, sym, addr):
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self.elf = elf
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self.ld_constants = ld_constants
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self.sym = sym
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self.addr = addr
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# Point to the handles instance associated with the device;
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# assigned by correlating the device struct handles pointer
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# value with the addr of a Handles instance.
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self.__handles = None
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@property
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def obj_handles(self):
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"""
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Returns the value from the device struct handles field, pointing to the
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array of handles for devices this device depends on.
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"""
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if self.__handles is None:
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data = symbol_data(self.elf, self.sym)
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format = "<" if self.elf.little_endian else ">"
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if self.elf.elfclass == 32:
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format += "I"
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size = 4
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else:
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format += "Q"
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size = 8
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offset = self.ld_constants["DEVICE_STRUCT_HANDLES_OFFSET"]
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self.__handles = struct.unpack(format, data[offset:offset + size])[0]
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return self.__handles
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class Handles:
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def __init__(self, sym, addr, handles, node):
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self.sym = sym
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self.addr = addr
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self.handles = handles
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self.node = node
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self.dep_ord = None
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self.dev_deps = None
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self.ext_deps = None
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def main():
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parse_args()
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assert args.kernel, "--kernel ELF required to extract data"
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elf = ELFFile(open(args.kernel, "rb"))
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edtser = os.path.join(os.path.split(args.kernel)[0], "edt.pickle")
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with open(edtser, 'rb') as f:
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edt = pickle.load(f)
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devices = []
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handles = []
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# Leading _ are stripped from the stored constant key
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want_constants = set(["__device_start",
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"_DEVICE_STRUCT_SIZEOF",
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"_DEVICE_STRUCT_HANDLES_OFFSET"])
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ld_constants = dict()
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for section in elf.iter_sections():
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if isinstance(section, SymbolTableSection):
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for sym in section.iter_symbols():
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if sym.name in want_constants:
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ld_constants[sym.name.lstrip("_")] = sym.entry.st_value
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continue
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if sym.entry.st_info.type != 'STT_OBJECT':
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continue
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if sym.name.startswith("__device"):
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addr = sym.entry.st_value
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if sym.name.startswith("__device_"):
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devices.append(Device(elf, ld_constants, sym, addr))
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debug("device %s" % (sym.name,))
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elif sym.name.startswith("__devicehdl_"):
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hdls = symbol_handle_data(elf, sym)
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# The first element of the hdls array is the dependency
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# ordinal of the device, which identifies the devicetree
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# node.
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node = edt.dep_ord2node[hdls[0]] if (hdls and hdls[0] != 0) else None
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handles.append(Handles(sym, addr, hdls, node))
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debug("handles %s %d %s" % (sym.name, hdls[0] if hdls else -1, node))
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assert len(want_constants) == len(ld_constants), "linker map data incomplete"
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devices = sorted(devices, key = lambda k: k.sym.entry.st_value)
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device_start_addr = ld_constants["device_start"]
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device_size = 0
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assert len(devices) == len(handles), 'mismatch devices and handles'
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used_nodes = set()
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for handle in handles:
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for device in devices:
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if handle.addr == device.obj_handles:
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handle.device = device
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break
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device = handle.device
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assert device, 'no device for %s' % (handle.sym.name,)
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device.handle = handle
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if device_size == 0:
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device_size = device.sym.entry.st_size
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# The device handle is one plus the ordinal of this device in
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# the device table.
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device.dev_handle = 1 + int((device.sym.entry.st_value - device_start_addr) / device_size)
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debug("%s dev ordinal %d" % (device.sym.name, device.dev_handle))
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n = handle.node
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if n is not None:
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debug("%s dev ordinal %d\n\t%s" % (n.path, device.dev_handle, ' ; '.join(str(_) for _ in handle.handles)))
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used_nodes.add(n)
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n.__device = device
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else:
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debug("orphan %d" % (device.dev_handle,))
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hv = handle.handles
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hvi = 1
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handle.dev_deps = []
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handle.ext_deps = []
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deps = handle.dev_deps
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while True:
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h = hv[hvi]
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if h == DEVICE_HANDLE_ENDS:
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break
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if h == DEVICE_HANDLE_SEP:
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deps = handle.ext_deps
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else:
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deps.append(h)
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n = edt
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hvi += 1
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# Compute the dependency graph induced from the full graph restricted to the
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# the nodes that exist in the application. Note that the edges in the
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# induced graph correspond to paths in the full graph.
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root = edt.dep_ord2node[0]
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assert root not in used_nodes
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for sn in used_nodes:
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# Where we're storing the final set of nodes: these are all used
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sn.__depends = set()
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deps = set(sn.depends_on)
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debug("\nNode: %s\nOrig deps:\n\t%s" % (sn.path, "\n\t".join([dn.path for dn in deps])))
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while len(deps) > 0:
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dn = deps.pop()
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if dn in used_nodes:
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# this is used
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sn.__depends.add(dn)
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elif dn != root:
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# forward the dependency up one level
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for ddn in dn.depends_on:
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deps.add(ddn)
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debug("final deps:\n\t%s\n" % ("\n\t".join([ _dn.path for _dn in sn.__depends])))
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with open(args.output_source, "w") as fp:
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fp.write('#include <device.h>\n')
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fp.write('#include <toolchain.h>\n')
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for dev in devices:
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hs = dev.handle
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assert hs, "no hs for %s" % (dev.sym.name,)
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dep_paths = []
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ext_paths = []
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hdls = []
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sn = hs.node
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if sn:
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hdls.extend(dn.__device.dev_handle for dn in sn.__depends)
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for dn in sn.depends_on:
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if dn in sn.__depends:
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dep_paths.append(dn.path)
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else:
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dep_paths.append('(%s)' % dn.path)
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if len(hs.ext_deps) > 0:
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# TODO: map these to something smaller?
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ext_paths.extend(map(str, hs.ext_deps))
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hdls.append(DEVICE_HANDLE_SEP)
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hdls.extend(hs.ext_deps)
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# When CONFIG_USERSPACE is enabled the pre-built elf is
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# also used to get hashes that identify kernel objects by
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# address. We can't allow the size of any object in the
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# final elf to change.
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while len(hdls) < len(hs.handles):
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hdls.append(DEVICE_HANDLE_ENDS)
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assert len(hdls) == len(hs.handles), "%s handle overflow" % (dev.sym.name,)
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lines = [
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'',
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'/* %d : %s:' % (dev.dev_handle, (sn and sn.path) or "sysinit"),
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]
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if len(dep_paths) > 0:
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lines.append(' * - %s' % ('\n * - '.join(dep_paths)))
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if len(ext_paths) > 0:
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lines.append(' * + %s' % ('\n * + '.join(ext_paths)))
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lines.extend([
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' */',
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'const device_handle_t __aligned(2) __attribute__((__section__(".__device_handles_pass2")))',
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'%s[] = { %s };' % (hs.sym.name, ', '.join([handle_name(_h) for _h in hdls])),
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'',
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])
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fp.write('\n'.join(lines))
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if __name__ == "__main__":
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main()
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