1003 lines
31 KiB
Python
Executable File
1003 lines
31 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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#
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# SPDX-License-Identifier: Apache-2.0
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"""
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Script to generate gperf tables of kernel object metadata
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User mode threads making system calls reference kernel objects by memory
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address, as the kernel/driver APIs in Zephyr are the same for both user
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and supervisor contexts. It is necessary for the kernel to be able to
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validate accesses to kernel objects to make the following assertions:
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- That the memory address points to a kernel object
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- The kernel object is of the expected type for the API being invoked
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- The kernel object is of the expected initialization state
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- The calling thread has sufficient permissions on the object
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For more details see the :ref:`kernelobjects` section in the documentation.
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The zephyr build generates an intermediate ELF binary, zephyr_prebuilt.elf,
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which this script scans looking for kernel objects by examining the DWARF
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debug information to look for instances of data structures that are considered
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kernel objects. For device drivers, the API struct pointer populated at build
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time is also examined to disambiguate between various device driver instances
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since they are all 'struct device'.
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This script can generate five different output files:
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- A gperf script to generate the hash table mapping kernel object memory
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addresses to kernel object metadata, used to track permissions,
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object type, initialization state, and any object-specific data.
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- A header file containing generated macros for validating driver instances
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inside the system call handlers for the driver subsystem APIs.
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- A code fragment included by kernel.h with one enum constant for
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each kernel object type and each driver instance.
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- The inner cases of a switch/case C statement, included by
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kernel/userspace.c, mapping the kernel object types and driver
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instances to their human-readable representation in the
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otype_to_str() function.
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- The inner cases of a switch/case C statement, included by
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kernel/userspace.c, mapping kernel object types to their sizes.
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This is used for allocating instances of them at runtime
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(CONFIG_DYNAMIC_OBJECTS) in the obj_size_get() function.
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"""
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import sys
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import argparse
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import math
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import os
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import struct
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import json
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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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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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from collections import OrderedDict
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# Keys in this dictionary are structs which should be recognized as kernel
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# objects. Values are a tuple:
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#
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# - The first item is None, or the name of a Kconfig that
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# indicates the presence of this object's definition in case it is not
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# available in all configurations.
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#
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# - The second item is a boolean indicating whether it is permissible for
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# the object to be located in user-accessible memory.
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# Regular dictionaries are ordered only with Python 3.6 and
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# above. Good summary and pointers to official documents at:
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# https://stackoverflow.com/questions/39980323/are-dictionaries-ordered-in-python-3-6
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kobjects = OrderedDict([
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("k_mem_slab", (None, False)),
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("k_msgq", (None, False)),
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("k_mutex", (None, False)),
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("k_pipe", (None, False)),
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("k_queue", (None, False)),
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("k_poll_signal", (None, False)),
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("k_sem", (None, False)),
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("k_stack", (None, False)),
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("k_thread", (None, False)),
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("k_timer", (None, False)),
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("z_thread_stack_element", (None, False)),
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("device", (None, False)),
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("sys_mutex", (None, True)),
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("k_futex", (None, True))
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])
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def kobject_to_enum(kobj):
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if kobj.startswith("k_") or kobj.startswith("z_"):
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name = kobj[2:]
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else:
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name = kobj
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return "K_OBJ_%s" % name.upper()
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subsystems = [
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# Editing the list is deprecated, add the __subsystem sentinal to your driver
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# api declaration instead. e.x.
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#
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# __subsystem struct my_driver_api {
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# ....
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#};
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]
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def subsystem_to_enum(subsys):
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return "K_OBJ_DRIVER_" + subsys[:-11].upper()
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# --- debug stuff ---
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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 error(text):
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sys.exit("%s ERROR: %s" % (scr, text))
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def debug_die(die, text):
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lp_header = die.dwarfinfo.line_program_for_CU(die.cu).header
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files = lp_header["file_entry"]
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includes = lp_header["include_directory"]
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fileinfo = files[die.attributes["DW_AT_decl_file"].value - 1]
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filename = fileinfo.name.decode("utf-8")
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filedir = includes[fileinfo.dir_index - 1].decode("utf-8")
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path = os.path.join(filedir, filename)
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lineno = die.attributes["DW_AT_decl_line"].value
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debug(str(die))
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debug("File '%s', line %d:" % (path, lineno))
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debug(" %s" % text)
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# -- ELF processing
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DW_OP_addr = 0x3
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DW_OP_fbreg = 0x91
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STACK_TYPE = "z_thread_stack_element"
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thread_counter = 0
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sys_mutex_counter = 0
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futex_counter = 0
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stack_counter = 0
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# Global type environment. Populated by pass 1.
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type_env = {}
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extern_env = {}
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class KobjectInstance:
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def __init__(self, type_obj, addr):
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global thread_counter
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global sys_mutex_counter
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global futex_counter
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global stack_counter
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self.addr = addr
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self.type_obj = type_obj
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# Type name determined later since drivers needs to look at the
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# API struct address
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self.type_name = None
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if self.type_obj.name == "k_thread":
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# Assign an ID for this thread object, used to track its
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# permissions to other kernel objects
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self.data = thread_counter
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thread_counter = thread_counter + 1
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elif self.type_obj.name == "sys_mutex":
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self.data = "&kernel_mutexes[%d]" % sys_mutex_counter
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sys_mutex_counter += 1
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elif self.type_obj.name == "k_futex":
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self.data = "&futex_data[%d]" % futex_counter
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futex_counter += 1
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elif self.type_obj.name == STACK_TYPE:
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stack_counter += 1
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else:
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self.data = 0
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class KobjectType:
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def __init__(self, offset, name, size, api=False):
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self.name = name
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self.size = size
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self.offset = offset
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self.api = api
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def __repr__(self):
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return "<kobject %s>" % self.name
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@staticmethod
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def has_kobject():
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return True
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def get_kobjects(self, addr):
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return {addr: KobjectInstance(self, addr)}
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class ArrayType:
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def __init__(self, offset, elements, member_type):
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self.elements = elements
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self.member_type = member_type
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self.offset = offset
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def __repr__(self):
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return "<array of %d>" % self.member_type
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def has_kobject(self):
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if self.member_type not in type_env:
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return False
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return type_env[self.member_type].has_kobject()
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def get_kobjects(self, addr):
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mt = type_env[self.member_type]
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# Stacks are arrays of _k_stack_element_t but we want to treat
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# the whole array as one kernel object (a thread stack)
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# Data value gets set to size of entire region
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if isinstance(mt, KobjectType) and mt.name == STACK_TYPE:
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# An array of stacks appears as a multi-dimensional array.
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# The last size is the size of each stack. We need to track
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# each stack within the array, not as one huge stack object.
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*dimensions, stacksize = self.elements
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num_members = 1
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for e in dimensions:
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num_members = num_members * e
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ret = {}
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for i in range(num_members):
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a = addr + (i * stacksize)
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o = mt.get_kobjects(a)
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o[a].data = stacksize
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ret.update(o)
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return ret
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objs = {}
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# Multidimensional array flattened out
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num_members = 1
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for e in self.elements:
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num_members = num_members * e
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for i in range(num_members):
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objs.update(mt.get_kobjects(addr + (i * mt.size)))
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return objs
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class AggregateTypeMember:
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def __init__(self, offset, member_name, member_type, member_offset):
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self.member_name = member_name
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self.member_type = member_type
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if isinstance(member_offset, list):
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# DWARF v2, location encoded as set of operations
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# only "DW_OP_plus_uconst" with ULEB128 argument supported
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if member_offset[0] == 0x23:
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self.member_offset = member_offset[1] & 0x7f
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for i in range(1, len(member_offset)-1):
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if member_offset[i] & 0x80:
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self.member_offset += (
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member_offset[i+1] & 0x7f) << i*7
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else:
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raise Exception("not yet supported location operation (%s:%d:%d)" %
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(self.member_name, self.member_type, member_offset[0]))
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else:
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self.member_offset = member_offset
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def __repr__(self):
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return "<member %s, type %d, offset %d>" % (
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self.member_name, self.member_type, self.member_offset)
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def has_kobject(self):
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if self.member_type not in type_env:
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return False
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return type_env[self.member_type].has_kobject()
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def get_kobjects(self, addr):
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mt = type_env[self.member_type]
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return mt.get_kobjects(addr + self.member_offset)
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class ConstType:
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def __init__(self, child_type):
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self.child_type = child_type
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def __repr__(self):
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return "<const %d>" % self.child_type
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def has_kobject(self):
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if self.child_type not in type_env:
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return False
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return type_env[self.child_type].has_kobject()
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def get_kobjects(self, addr):
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return type_env[self.child_type].get_kobjects(addr)
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class AggregateType:
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def __init__(self, offset, name, size):
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self.name = name
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self.size = size
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self.offset = offset
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self.members = []
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def add_member(self, member):
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self.members.append(member)
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def __repr__(self):
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return "<struct %s, with %s>" % (self.name, self.members)
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def has_kobject(self):
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result = False
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bad_members = []
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for member in self.members:
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if member.has_kobject():
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result = True
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else:
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bad_members.append(member)
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# Don't need to consider this again, just remove it
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for bad_member in bad_members:
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self.members.remove(bad_member)
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return result
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def get_kobjects(self, addr):
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objs = {}
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for member in self.members:
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objs.update(member.get_kobjects(addr))
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return objs
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# --- helper functions for getting data from DIEs ---
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def die_get_spec(die):
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if 'DW_AT_specification' not in die.attributes:
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return None
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spec_val = die.attributes["DW_AT_specification"].value
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# offset of the DW_TAG_variable for the extern declaration
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offset = spec_val + die.cu.cu_offset
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return extern_env.get(offset)
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def die_get_name(die):
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if 'DW_AT_name' not in die.attributes:
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die = die_get_spec(die)
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if not die:
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return None
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return die.attributes["DW_AT_name"].value.decode("utf-8")
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def die_get_type_offset(die):
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if 'DW_AT_type' not in die.attributes:
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die = die_get_spec(die)
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if not die:
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return None
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return die.attributes["DW_AT_type"].value + die.cu.cu_offset
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def die_get_byte_size(die):
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if 'DW_AT_byte_size' not in die.attributes:
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return 0
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return die.attributes["DW_AT_byte_size"].value
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def analyze_die_struct(die):
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name = die_get_name(die) or "<anon>"
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offset = die.offset
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size = die_get_byte_size(die)
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# Incomplete type
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if not size:
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return
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if name in kobjects:
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type_env[offset] = KobjectType(offset, name, size)
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elif name in subsystems:
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type_env[offset] = KobjectType(offset, name, size, api=True)
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else:
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at = AggregateType(offset, name, size)
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type_env[offset] = at
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for child in die.iter_children():
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if child.tag != "DW_TAG_member":
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continue
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data_member_location = child.attributes.get("DW_AT_data_member_location")
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if not data_member_location:
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continue
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child_type = die_get_type_offset(child)
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member_offset = data_member_location.value
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cname = die_get_name(child) or "<anon>"
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m = AggregateTypeMember(child.offset, cname, child_type,
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member_offset)
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at.add_member(m)
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return
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def analyze_die_const(die):
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type_offset = die_get_type_offset(die)
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if not type_offset:
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return
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type_env[die.offset] = ConstType(type_offset)
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def analyze_die_array(die):
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type_offset = die_get_type_offset(die)
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elements = []
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for child in die.iter_children():
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if child.tag != "DW_TAG_subrange_type":
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continue
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if "DW_AT_upper_bound" not in child.attributes:
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continue
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ub = child.attributes["DW_AT_upper_bound"]
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if not ub.form.startswith("DW_FORM_data"):
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continue
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elements.append(ub.value + 1)
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if not elements:
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if type_offset in type_env.keys():
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mt = type_env[type_offset]
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if mt.has_kobject():
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if isinstance(mt, KobjectType) and mt.name == STACK_TYPE:
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elements.append(1)
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type_env[die.offset] = ArrayType(die.offset, elements, type_offset)
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else:
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type_env[die.offset] = ArrayType(die.offset, elements, type_offset)
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def analyze_typedef(die):
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type_offset = die_get_type_offset(die)
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if type_offset not in type_env.keys():
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return
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type_env[die.offset] = type_env[type_offset]
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def unpack_pointer(elf, data, offset):
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endian_code = "<" if elf.little_endian else ">"
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if elf.elfclass == 32:
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size_code = "I"
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size = 4
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else:
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size_code = "Q"
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size = 8
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return struct.unpack(endian_code + size_code,
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data[offset:offset + size])[0]
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def addr_deref(elf, addr):
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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 < end:
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data = section.data()
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offset = addr - start
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return unpack_pointer(elf, data, offset)
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return 0
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def device_get_api_addr(elf, addr):
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# Read device->driver API
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offset = 4 if elf.elfclass == 32 else 8
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return addr_deref(elf, addr + offset)
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def find_kobjects(elf, syms):
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if not elf.has_dwarf_info():
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sys.exit("ELF file has no DWARF information")
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app_smem_start = syms["_app_smem_start"]
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app_smem_end = syms["_app_smem_end"]
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di = elf.get_dwarf_info()
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variables = []
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# Step 1: collect all type information.
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for CU in di.iter_CUs():
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for die in CU.iter_DIEs():
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# Unions are disregarded, kernel objects should never be union
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# members since the memory is not dedicated to that object and
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# could be something else
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if die.tag == "DW_TAG_structure_type":
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analyze_die_struct(die)
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elif die.tag == "DW_TAG_const_type":
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analyze_die_const(die)
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elif die.tag == "DW_TAG_array_type":
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analyze_die_array(die)
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elif die.tag == "DW_TAG_typedef":
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analyze_typedef(die)
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elif die.tag == "DW_TAG_variable":
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variables.append(die)
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# Step 2: filter type_env to only contain kernel objects, or structs
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# and arrays of kernel objects
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bad_offsets = []
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for offset, type_object in type_env.items():
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if not type_object.has_kobject():
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bad_offsets.append(offset)
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for offset in bad_offsets:
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del type_env[offset]
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# Step 3: Now that we know all the types we are looking for, examine
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# all variables
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all_objs = {}
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for die in variables:
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name = die_get_name(die)
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if not name:
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continue
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if name.startswith("__device_sys_init"):
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# Boot-time initialization function; not an actual device
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continue
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|
|
type_offset = die_get_type_offset(die)
|
|
|
|
# Is this a kernel object, or a structure containing kernel
|
|
# objects?
|
|
if type_offset not in type_env:
|
|
continue
|
|
|
|
if "DW_AT_declaration" in die.attributes:
|
|
# Extern declaration, only used indirectly
|
|
extern_env[die.offset] = die
|
|
continue
|
|
|
|
if "DW_AT_location" not in die.attributes:
|
|
debug_die(die,
|
|
"No location information for object '%s'; possibly stack allocated"
|
|
% name)
|
|
continue
|
|
|
|
loc = die.attributes["DW_AT_location"]
|
|
if loc.form != "DW_FORM_exprloc" and \
|
|
loc.form != "DW_FORM_block1":
|
|
debug_die(die, "kernel object '%s' unexpected location format" %
|
|
name)
|
|
continue
|
|
|
|
opcode = loc.value[0]
|
|
if opcode != DW_OP_addr:
|
|
|
|
# Check if frame pointer offset DW_OP_fbreg
|
|
if opcode == DW_OP_fbreg:
|
|
debug_die(die, "kernel object '%s' found on stack" % name)
|
|
else:
|
|
debug_die(die,
|
|
"kernel object '%s' unexpected exprloc opcode %s" %
|
|
(name, hex(opcode)))
|
|
continue
|
|
|
|
addr = (loc.value[1] | (loc.value[2] << 8) |
|
|
(loc.value[3] << 16) | (loc.value[4] << 24))
|
|
|
|
if addr == 0:
|
|
# Never linked; gc-sections deleted it
|
|
continue
|
|
|
|
type_obj = type_env[type_offset]
|
|
objs = type_obj.get_kobjects(addr)
|
|
all_objs.update(objs)
|
|
|
|
debug("symbol '%s' at %s contains %d object(s)"
|
|
% (name, hex(addr), len(objs)))
|
|
|
|
# Step 4: objs is a dictionary mapping variable memory addresses to
|
|
# their associated type objects. Now that we have seen all variables
|
|
# and can properly look up API structs, convert this into a dictionary
|
|
# mapping variables to the C enumeration of what kernel object type it
|
|
# is.
|
|
ret = {}
|
|
for addr, ko in all_objs.items():
|
|
# API structs don't get into the gperf table
|
|
if ko.type_obj.api:
|
|
continue
|
|
|
|
_, user_ram_allowed = kobjects[ko.type_obj.name]
|
|
if not user_ram_allowed and app_smem_start <= addr < app_smem_end:
|
|
debug_die(die, "object '%s' found in invalid location %s"
|
|
% (name, hex(addr)))
|
|
continue
|
|
|
|
if ko.type_obj.name != "device":
|
|
# Not a device struct so we immediately know its type
|
|
ko.type_name = kobject_to_enum(ko.type_obj.name)
|
|
ret[addr] = ko
|
|
continue
|
|
|
|
# Device struct. Need to get the address of its API struct,
|
|
# if it has one.
|
|
apiaddr = device_get_api_addr(elf, addr)
|
|
if apiaddr not in all_objs:
|
|
if apiaddr == 0:
|
|
debug("device instance at 0x%x has no associated subsystem"
|
|
% addr)
|
|
else:
|
|
debug("device instance at 0x%x has unknown API 0x%x"
|
|
% (addr, apiaddr))
|
|
# API struct does not correspond to a known subsystem, skip it
|
|
continue
|
|
|
|
apiobj = all_objs[apiaddr]
|
|
ko.type_name = subsystem_to_enum(apiobj.type_obj.name)
|
|
ret[addr] = ko
|
|
|
|
debug("found %d kernel object instances total" % len(ret))
|
|
|
|
# 1. Before python 3.7 dict order is not guaranteed. With Python
|
|
# 3.5 it doesn't seem random with *integer* keys but can't
|
|
# rely on that.
|
|
# 2. OrderedDict means _insertion_ order, so not enough because
|
|
# built from other (random!) dicts: need to _sort_ first.
|
|
# 3. Sorting memory address looks good.
|
|
return OrderedDict(sorted(ret.items()))
|
|
|
|
def get_symbols(elf):
|
|
for section in elf.iter_sections():
|
|
if isinstance(section, SymbolTableSection):
|
|
return {sym.name: sym.entry.st_value
|
|
for sym in section.iter_symbols()}
|
|
|
|
raise LookupError("Could not find symbol table")
|
|
|
|
|
|
# -- GPERF generation logic
|
|
|
|
header = """%compare-lengths
|
|
%define lookup-function-name z_object_lookup
|
|
%language=ANSI-C
|
|
%global-table
|
|
%struct-type
|
|
%{
|
|
#include <kernel.h>
|
|
#include <toolchain.h>
|
|
#include <syscall_handler.h>
|
|
#include <string.h>
|
|
%}
|
|
struct z_object;
|
|
"""
|
|
|
|
# Different versions of gperf have different prototypes for the lookup
|
|
# function, best to implement the wrapper here. The pointer value itself is
|
|
# turned into a string, we told gperf to expect binary strings that are not
|
|
# NULL-terminated.
|
|
footer = """%%
|
|
struct z_object *z_object_gperf_find(void *obj)
|
|
{
|
|
return z_object_lookup((const char *)obj, sizeof(void *));
|
|
}
|
|
|
|
void z_object_gperf_wordlist_foreach(_wordlist_cb_func_t func, void *context)
|
|
{
|
|
int i;
|
|
|
|
for (i = MIN_HASH_VALUE; i <= MAX_HASH_VALUE; i++) {
|
|
if (wordlist[i].name != NULL) {
|
|
func(&wordlist[i], context);
|
|
}
|
|
}
|
|
}
|
|
|
|
#ifndef CONFIG_DYNAMIC_OBJECTS
|
|
struct z_object *z_object_find(void *obj)
|
|
ALIAS_OF(z_object_gperf_find);
|
|
|
|
void z_object_wordlist_foreach(_wordlist_cb_func_t func, void *context)
|
|
ALIAS_OF(z_object_gperf_wordlist_foreach);
|
|
#endif
|
|
"""
|
|
|
|
|
|
def write_gperf_table(fp, syms, objs, little_endian, static_begin, static_end):
|
|
fp.write(header)
|
|
if sys_mutex_counter != 0:
|
|
fp.write("static struct k_mutex kernel_mutexes[%d] = {\n"
|
|
% sys_mutex_counter)
|
|
for i in range(sys_mutex_counter):
|
|
fp.write("_K_MUTEX_INITIALIZER(kernel_mutexes[%d])" % i)
|
|
if i != sys_mutex_counter - 1:
|
|
fp.write(", ")
|
|
fp.write("};\n")
|
|
|
|
if futex_counter != 0:
|
|
fp.write("static struct z_futex_data futex_data[%d] = {\n"
|
|
% futex_counter)
|
|
for i in range(futex_counter):
|
|
fp.write("Z_FUTEX_DATA_INITIALIZER(futex_data[%d])" % i)
|
|
if i != futex_counter - 1:
|
|
fp.write(", ")
|
|
fp.write("};\n")
|
|
|
|
metadata_names = {
|
|
"K_OBJ_THREAD" : "thread_id",
|
|
"K_OBJ_SYS_MUTEX" : "mutex",
|
|
"K_OBJ_FUTEX" : "futex_data"
|
|
}
|
|
|
|
if "CONFIG_GEN_PRIV_STACKS" in syms:
|
|
metadata_names["K_OBJ_THREAD_STACK_ELEMENT"] = "stack_data"
|
|
if stack_counter != 0:
|
|
fp.write("static u8_t Z_GENERIC_SECTION(.priv_stacks.noinit) "
|
|
" __aligned(Z_PRIVILEGE_STACK_ALIGN)"
|
|
" priv_stacks[%d][CONFIG_PRIVILEGED_STACK_SIZE];\n"
|
|
% stack_counter)
|
|
|
|
fp.write("static struct z_stack_data stack_data[%d] = {\n"
|
|
% stack_counter)
|
|
counter = 0
|
|
for _, ko in objs.items():
|
|
if ko.type_name != "K_OBJ_THREAD_STACK_ELEMENT":
|
|
continue
|
|
|
|
# ko.data currently has the stack size. fetch the value to
|
|
# populate the appropriate entry in stack_data, and put
|
|
# a reference to the entry in stack_data into the data value
|
|
# instead
|
|
size = ko.data
|
|
ko.data = "&stack_data[%d]" % counter
|
|
fp.write("\t{ %d, (u8_t *)(&priv_stacks[%d]) }"
|
|
% (size, counter))
|
|
if counter != (stack_counter - 1):
|
|
fp.write(",")
|
|
fp.write("\n")
|
|
counter += 1
|
|
fp.write("};\n")
|
|
else:
|
|
metadata_names["K_OBJ_THREAD_STACK_ELEMENT"] = "stack_size"
|
|
|
|
fp.write("%%\n")
|
|
# Setup variables for mapping thread indexes
|
|
thread_max_bytes = syms["CONFIG_MAX_THREAD_BYTES"]
|
|
thread_idx_map = {}
|
|
|
|
for i in range(0, thread_max_bytes):
|
|
thread_idx_map[i] = 0xFF
|
|
|
|
for obj_addr, ko in objs.items():
|
|
obj_type = ko.type_name
|
|
# pre-initialized objects fall within this memory range, they are
|
|
# either completely initialized at build time, or done automatically
|
|
# at boot during some PRE_KERNEL_* phase
|
|
initialized = static_begin <= obj_addr < static_end
|
|
is_driver = obj_type.startswith("K_OBJ_DRIVER_")
|
|
|
|
if "CONFIG_64BIT" in syms:
|
|
format_code = "Q"
|
|
else:
|
|
format_code = "I"
|
|
|
|
if little_endian:
|
|
endian = "<"
|
|
else:
|
|
endian = ">"
|
|
|
|
byte_str = struct.pack(endian + format_code, obj_addr)
|
|
fp.write("\"")
|
|
for byte in byte_str:
|
|
val = "\\x%02x" % byte
|
|
fp.write(val)
|
|
|
|
flags = "0"
|
|
if initialized:
|
|
flags += " | K_OBJ_FLAG_INITIALIZED"
|
|
if is_driver:
|
|
flags += " | K_OBJ_FLAG_DRIVER"
|
|
|
|
if ko.type_name in metadata_names:
|
|
tname = metadata_names[ko.type_name]
|
|
else:
|
|
tname = "unused"
|
|
|
|
fp.write("\", {}, %s, %s, { .%s = %s }\n" % (obj_type, flags,
|
|
tname, str(ko.data)))
|
|
|
|
if obj_type == "K_OBJ_THREAD":
|
|
idx = math.floor(ko.data / 8)
|
|
bit = ko.data % 8
|
|
thread_idx_map[idx] = thread_idx_map[idx] & ~(2**bit)
|
|
|
|
fp.write(footer)
|
|
|
|
# Generate the array of already mapped thread indexes
|
|
fp.write('\n')
|
|
fp.write('Z_GENERIC_SECTION(.kobject_data.data) ')
|
|
fp.write('u8_t _thread_idx_map[%d] = {' % (thread_max_bytes))
|
|
|
|
for i in range(0, thread_max_bytes):
|
|
fp.write(' 0x%x, ' % (thread_idx_map[i]))
|
|
|
|
fp.write('};\n')
|
|
|
|
|
|
driver_macro_tpl = """
|
|
#define Z_SYSCALL_DRIVER_%(driver_upper)s(ptr, op) Z_SYSCALL_DRIVER_GEN(ptr, op, %(driver_lower)s, %(driver_upper)s)
|
|
"""
|
|
|
|
|
|
def write_validation_output(fp):
|
|
fp.write("#ifndef DRIVER_VALIDATION_GEN_H\n")
|
|
fp.write("#define DRIVER_VALIDATION_GEN_H\n")
|
|
|
|
fp.write("""#define Z_SYSCALL_DRIVER_GEN(ptr, op, driver_lower_case, driver_upper_case) \\
|
|
(Z_SYSCALL_OBJ(ptr, K_OBJ_DRIVER_##driver_upper_case) || \\
|
|
Z_SYSCALL_DRIVER_OP(ptr, driver_lower_case##_driver_api, op))
|
|
""")
|
|
|
|
for subsystem in subsystems:
|
|
subsystem = subsystem.replace("_driver_api", "")
|
|
|
|
fp.write(driver_macro_tpl % {
|
|
"driver_lower": subsystem.lower(),
|
|
"driver_upper": subsystem.upper(),
|
|
})
|
|
|
|
fp.write("#endif /* DRIVER_VALIDATION_GEN_H */\n")
|
|
|
|
|
|
def write_kobj_types_output(fp):
|
|
fp.write("/* Core kernel objects */\n")
|
|
for kobj, obj_info in kobjects.items():
|
|
dep, _ = obj_info
|
|
if kobj == "device":
|
|
continue
|
|
|
|
if dep:
|
|
fp.write("#ifdef %s\n" % dep)
|
|
|
|
fp.write("%s,\n" % kobject_to_enum(kobj))
|
|
|
|
if dep:
|
|
fp.write("#endif\n")
|
|
|
|
fp.write("/* Driver subsystems */\n")
|
|
for subsystem in subsystems:
|
|
subsystem = subsystem.replace("_driver_api", "").upper()
|
|
fp.write("K_OBJ_DRIVER_%s,\n" % subsystem)
|
|
|
|
|
|
def write_kobj_otype_output(fp):
|
|
fp.write("/* Core kernel objects */\n")
|
|
for kobj, obj_info in kobjects.items():
|
|
dep, _ = obj_info
|
|
if kobj == "device":
|
|
continue
|
|
|
|
if dep:
|
|
fp.write("#ifdef %s\n" % dep)
|
|
|
|
fp.write('case %s: ret = "%s"; break;\n' %
|
|
(kobject_to_enum(kobj), kobj))
|
|
if dep:
|
|
fp.write("#endif\n")
|
|
|
|
fp.write("/* Driver subsystems */\n")
|
|
for subsystem in subsystems:
|
|
subsystem = subsystem.replace("_driver_api", "")
|
|
fp.write('case K_OBJ_DRIVER_%s: ret = "%s driver"; break;\n' % (
|
|
subsystem.upper(),
|
|
subsystem
|
|
))
|
|
|
|
|
|
def write_kobj_size_output(fp):
|
|
fp.write("/* Non device/stack objects */\n")
|
|
for kobj, obj_info in kobjects.items():
|
|
dep, _ = obj_info
|
|
# device handled by default case. Stacks are not currently handled,
|
|
# if they eventually are it will be a special case.
|
|
if kobj in {"device", STACK_TYPE}:
|
|
continue
|
|
|
|
if dep:
|
|
fp.write("#ifdef %s\n" % dep)
|
|
|
|
fp.write('case %s: ret = sizeof(struct %s); break;\n' %
|
|
(kobject_to_enum(kobj), kobj))
|
|
if dep:
|
|
fp.write("#endif\n")
|
|
|
|
|
|
def parse_subsystems_list_file(path):
|
|
with open(path, "r") as fp:
|
|
subsys_list = json.load(fp)
|
|
subsystems.extend(subsys_list)
|
|
|
|
def parse_args():
|
|
global args
|
|
|
|
parser = argparse.ArgumentParser(
|
|
description=__doc__,
|
|
formatter_class=argparse.RawDescriptionHelpFormatter)
|
|
|
|
parser.add_argument("-k", "--kernel", required=False,
|
|
help="Input zephyr ELF binary")
|
|
parser.add_argument(
|
|
"-g", "--gperf-output", required=False,
|
|
help="Output list of kernel object addresses for gperf use")
|
|
parser.add_argument(
|
|
"-V", "--validation-output", required=False,
|
|
help="Output driver validation macros")
|
|
parser.add_argument(
|
|
"-K", "--kobj-types-output", required=False,
|
|
help="Output k_object enum constants")
|
|
parser.add_argument(
|
|
"-S", "--kobj-otype-output", required=False,
|
|
help="Output case statements for otype_to_str()")
|
|
parser.add_argument(
|
|
"-Z", "--kobj-size-output", required=False,
|
|
help="Output case statements for obj_size_get()")
|
|
parser.add_argument("-i", "--include-subsystem-list", required=False, action='append',
|
|
help='''Specifies a file with a JSON encoded list of subsystem names to append to
|
|
the driver subsystems list. Can be specified multiple times:
|
|
-i file1 -i file2 ...''')
|
|
|
|
parser.add_argument("-v", "--verbose", action="store_true",
|
|
help="Print extra debugging information")
|
|
args = parser.parse_args()
|
|
if "VERBOSE" in os.environ:
|
|
args.verbose = 1
|
|
|
|
|
|
def main():
|
|
parse_args()
|
|
|
|
if args.include_subsystem_list is not None:
|
|
for list_file in args.include_subsystem_list:
|
|
parse_subsystems_list_file(list_file)
|
|
|
|
if args.gperf_output:
|
|
assert args.kernel, "--kernel ELF required for --gperf-output"
|
|
elf = ELFFile(open(args.kernel, "rb"))
|
|
syms = get_symbols(elf)
|
|
max_threads = syms["CONFIG_MAX_THREAD_BYTES"] * 8
|
|
objs = find_kobjects(elf, syms)
|
|
if not objs:
|
|
sys.stderr.write("WARNING: zero kobject found in %s\n"
|
|
% args.kernel)
|
|
|
|
if thread_counter > max_threads:
|
|
sys.exit("Too many thread objects ({})\n"
|
|
"Increase CONFIG_MAX_THREAD_BYTES to {}"
|
|
.format(thread_counter, -(-thread_counter // 8)))
|
|
|
|
with open(args.gperf_output, "w") as fp:
|
|
write_gperf_table(fp, syms, objs, elf.little_endian,
|
|
syms["_static_kernel_objects_begin"],
|
|
syms["_static_kernel_objects_end"])
|
|
|
|
if args.validation_output:
|
|
with open(args.validation_output, "w") as fp:
|
|
write_validation_output(fp)
|
|
|
|
if args.kobj_types_output:
|
|
with open(args.kobj_types_output, "w") as fp:
|
|
write_kobj_types_output(fp)
|
|
|
|
if args.kobj_otype_output:
|
|
with open(args.kobj_otype_output, "w") as fp:
|
|
write_kobj_otype_output(fp)
|
|
|
|
if args.kobj_size_output:
|
|
with open(args.kobj_size_output, "w") as fp:
|
|
write_kobj_size_output(fp)
|
|
|
|
|
|
if __name__ == "__main__":
|
|
main()
|