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#!/usr/bin/env python
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#
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# Based on cally.py (https://github.com/chaudron/cally/), Copyright 2018, Eelco Chaudron
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# Copyright 2020 Espressif Systems (Shanghai) PTE LTD
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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import argparse
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from functools import partial
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import os
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import re
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import elftools
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from elftools.elf import elffile
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try:
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from typing import List, Optional, BinaryIO, Tuple, Generator, Dict, Callable
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except ImportError:
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pass
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FUNCTION_REGEX = re.compile(
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r"^;; Function (?P<mangle>.*)\s+\((?P<function>\S+)(,.*)?\).*$"
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)
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CALL_REGEX = re.compile(r'^.*\(call.*"(?P<target>.*)".*$')
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SYMBOL_REF_REGEX = re.compile(r'^.*\(symbol_ref[^()]*\("(?P<target>.*)"\).*$')
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class RtlFunction(object):
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def __init__(self, name, rtl_filename, tu_filename):
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self.name = name
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self.rtl_filename = rtl_filename
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self.tu_filename = tu_filename
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self.calls = list() # type: List[str]
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self.refs = list() # type: List[str]
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self.sym = None
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class SectionAddressRange(object):
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def __init__(self, name, addr, size): # type: (str, int, int) -> None
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self.name = name
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self.low = addr
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self.high = addr + size
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def __str__(self):
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return "{}: 0x{:08x} - 0x{:08x}".format(self.name, self.low, self.high)
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def contains_address(self, addr):
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return self.low <= addr < self.high
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TARGET_SECTIONS = {
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"esp32": [
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SectionAddressRange(".rom.text", 0x40000000, 0x70000),
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SectionAddressRange(".rom.rodata", 0x3ff96000, 0x9018)
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],
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"esp32s2": [
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SectionAddressRange(".rom.text", 0x40000000, 0x1bed0),
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SectionAddressRange(".rom.rodata", 0x3ffac600, 0x392c)
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],
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"esp32s3": [
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SectionAddressRange(".rom.text", 0x40000000, 0x568d0),
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SectionAddressRange(".rom.rodata", 0x3ff071c0, 0x8e30)
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]
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} # type: Dict[str, List[SectionAddressRange]]
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class Symbol(object):
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def __init__(self, name, addr, local, filename, section): # type: (str, int, bool, Optional[str], Optional[str]) -> None
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self.name = name
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self.addr = addr
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self.local = local
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self.filename = filename
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self.section = section
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self.refers_to = list() # type: List[Symbol]
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self.referred_from = list() # type: List[Symbol]
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def __str__(self):
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return "{} @0x{:08x} [{}]{} {}".format(
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self.name,
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self.addr,
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self.section or "unknown",
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" (local)" if self.local else "",
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self.filename
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)
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class Reference(object):
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def __init__(self, from_sym, to_sym): # type: (Symbol, Symbol) -> None
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self.from_sym = from_sym
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self.to_sym = to_sym
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def __str__(self):
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return "{} @0x{:08x} ({}) -> {} @0x{:08x} ({})".format(
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self.from_sym.name,
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self.from_sym.addr,
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self.from_sym.section,
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self.to_sym.name,
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self.to_sym.addr,
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self.to_sym.section
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)
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class ElfInfo(object):
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def __init__(self, elf_file): # type: (BinaryIO) -> None
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self.elf_file = elf_file
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self.elf_obj = elffile.ELFFile(self.elf_file)
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self.section_ranges = self._load_sections()
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self.symbols = self._load_symbols()
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def _load_symbols(self): # type: () -> List[Symbol]
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symbols = []
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for s in self.elf_obj.iter_sections():
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if not isinstance(s, elftools.elf.sections.SymbolTableSection):
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continue
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filename = None
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for sym in s.iter_symbols():
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sym_type = sym.entry["st_info"]["type"]
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if sym_type == "STT_FILE":
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filename = sym.name
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if sym_type in ["STT_NOTYPE", "STT_FUNC", "STT_OBJECT"]:
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local = sym.entry["st_info"]["bind"] == "STB_LOCAL"
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addr = sym.entry["st_value"]
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symbols.append(
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Symbol(
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sym.name,
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addr,
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local,
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filename if local else None,
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self.section_for_addr(addr),
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)
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)
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return symbols
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def _load_sections(self): # type: () -> List[SectionAddressRange]
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result = []
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for segment in self.elf_obj.iter_segments():
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if segment["p_type"] == "PT_LOAD":
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for section in self.elf_obj.iter_sections():
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if not segment.section_in_segment(section):
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continue
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result.append(
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SectionAddressRange(
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section.name, section["sh_addr"], section["sh_size"]
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)
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)
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target = os.environ.get("IDF_TARGET")
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if target in TARGET_SECTIONS:
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result += TARGET_SECTIONS[target]
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return result
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def symbols_by_name(self, name): # type: (str) -> List[Symbol]
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res = []
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for sym in self.symbols:
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if sym.name == name:
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res.append(sym)
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return res
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def section_for_addr(self, sym_addr): # type: (int) -> Optional[str]
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for sar in self.section_ranges:
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if sar.contains_address(sym_addr):
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return sar.name
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return None
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def load_rtl_file(rtl_filename, tu_filename, functions): # type: (str, str, List[RtlFunction]) -> None
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last_function = None # type: Optional[RtlFunction]
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for line in open(rtl_filename):
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# Find function definition
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match = re.match(FUNCTION_REGEX, line)
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if match:
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function_name = match.group("function")
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last_function = RtlFunction(function_name, rtl_filename, tu_filename)
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functions.append(last_function)
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continue
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if last_function:
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# Find direct function calls
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match = re.match(CALL_REGEX, line)
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if match:
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target = match.group("target")
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if target not in last_function.calls:
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last_function.calls.append(target)
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continue
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# Find symbol references
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match = re.match(SYMBOL_REF_REGEX, line)
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if match:
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target = match.group("target")
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if target not in last_function.refs:
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last_function.refs.append(target)
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continue
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def rtl_filename_matches_sym_filename(rtl_filename, symbol_filename): # type: (str, str) -> bool
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# Symbol file names (from ELF debug info) are short source file names, without path: "cpu_start.c".
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# RTL file names are paths relative to the build directory, e.g.:
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# "build/esp-idf/esp_system/CMakeFiles/__idf_esp_system.dir/port/cpu_start.c.234r.expand"
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#
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# The check below may give a false positive if there are two files with the same name in
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# different directories. This doesn't seem to happen in IDF now, but if it does happen,
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# an assert in find_symbol_by_rtl_func should catch this.
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#
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# If this becomes and issue, consider also loading the .map file and using it to figure out
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# which object file was used as the source of each symbol. Names of the object files and RTL files
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# should be much easier to match.
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return os.path.basename(rtl_filename).startswith(symbol_filename)
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class SymbolNotFound(RuntimeError):
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pass
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def find_symbol_by_name(name, elfinfo, local_func_matcher): # type: (str, ElfInfo, Callable[[Symbol], bool]) -> Optional[Symbol]
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"""
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Find an ELF symbol for the given name.
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local_func_matcher is a callback function which checks is the candidate local symbol is suitable.
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"""
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syms = elfinfo.symbols_by_name(name)
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if not syms:
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return None
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if len(syms) == 1:
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return syms[0]
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else:
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# There are multiple symbols with a given name. Find the best fit.
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local_candidate = None
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global_candidate = None
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for sym in syms:
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if not sym.local:
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assert not global_candidate # can't have two global symbols with the same name
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global_candidate = sym
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elif local_func_matcher(sym):
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assert not local_candidate # can't have two symbols with the same name in a single file
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local_candidate = sym
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# If two symbols with the same name are defined, a global and a local one,
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# prefer the local symbol as the reference target.
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return local_candidate or global_candidate
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def match_local_source_func(rtl_filename, sym): # type: (str, Symbol) -> bool
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"""
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Helper for match_rtl_funcs_to_symbols, checks if local symbol sym is a good candidate for the
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reference source (caller), based on the RTL file name.
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"""
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assert sym.filename # should be set for local functions
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return rtl_filename_matches_sym_filename(rtl_filename, sym.filename)
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def match_local_target_func(rtl_filename, sym_from, sym): # type: (str, Symbol, Symbol) -> bool
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"""
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Helper for match_rtl_funcs_to_symbols, checks if local symbol sym is a good candidate for the
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reference target (callee or referenced data), based on RTL filename of the source symbol
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and the source symbol itself.
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"""
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assert sym.filename # should be set for local functions
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if sym_from.local:
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# local symbol referencing another local symbol
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return sym_from.filename == sym.filename
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else:
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# global symbol referencing a local symbol;
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# source filename is not known, use RTL filename as a hint
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return rtl_filename_matches_sym_filename(rtl_filename, sym.filename)
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def match_rtl_funcs_to_symbols(rtl_functions, elfinfo): # type: (List[RtlFunction], ElfInfo) -> Tuple[List[Symbol], List[Reference]]
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symbols = [] # type: List[Symbol]
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refs = [] # type: List[Reference]
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# General idea:
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# - iterate over RTL functions.
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# - for each RTL function, find the corresponding symbol
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# - iterate over the functions and variables referenced from this RTL function
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# - find symbols corresponding to the references
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# - record every pair (sym_from, sym_to) as a Reference object
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for source_rtl_func in rtl_functions:
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maybe_sym_from = find_symbol_by_name(source_rtl_func.name, elfinfo, partial(match_local_source_func, source_rtl_func.rtl_filename))
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if maybe_sym_from is None:
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# RTL references a symbol, but the symbol is not defined in the generated object file.
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# This means that the symbol was likely removed (or not included) at link time.
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# There is nothing we can do to check section placement in this case.
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continue
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sym_from = maybe_sym_from
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if sym_from not in symbols:
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symbols.append(sym_from)
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for target_rtl_func_name in source_rtl_func.calls + source_rtl_func.refs:
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if "*.LC" in target_rtl_func_name: # skip local labels
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continue
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maybe_sym_to = find_symbol_by_name(target_rtl_func_name, elfinfo, partial(match_local_target_func, source_rtl_func.rtl_filename, sym_from))
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if not maybe_sym_to:
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# This may happen for a extern reference in the RTL file, if the reference was later removed
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# by one of the optimization passes, and the external definition got garbage-collected.
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# TODO: consider adding some sanity check that we are here not because of some bug in
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# find_symbol_by_name?..
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continue
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sym_to = maybe_sym_to
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sym_from.refers_to.append(sym_to)
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sym_to.referred_from.append(sym_from)
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refs.append(Reference(sym_from, sym_to))
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if sym_to not in symbols:
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symbols.append(sym_to)
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return symbols, refs
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def get_symbols_and_refs(rtl_list, elf_file): # type: (List[str], BinaryIO) -> Tuple[List[Symbol], List[Reference]]
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elfinfo = ElfInfo(elf_file)
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rtl_functions = [] # type: List[RtlFunction]
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for file_name in rtl_list:
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load_rtl_file(file_name, file_name, rtl_functions)
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return match_rtl_funcs_to_symbols(rtl_functions, elfinfo)
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def list_refs_from_to_sections(refs, from_sections, to_sections): # type: (List[Reference], List[str], List[str]) -> int
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|
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found = 0
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for ref in refs:
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|
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if (not from_sections or ref.from_sym.section in from_sections) and \
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|
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(not to_sections or ref.to_sym.section in to_sections):
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|
|
print(str(ref))
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|
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found += 1
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|
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return found
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def find_files_recursive(root_path, ext): # type: (str, str) -> Generator[str, None, None]
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|
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for root, _, files in os.walk(root_path):
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|
for basename in files:
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|
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if basename.endswith(ext):
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|
|
filename = os.path.join(root, basename)
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|
|
yield filename
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|
|
def main():
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|
|
parser = argparse.ArgumentParser()
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|
|
|
|
parser.add_argument(
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|
|
"--rtl-list",
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|
|
help="File with the list of RTL files",
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|
|
type=argparse.FileType("r"),
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|
|
)
|
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|
|
parser.add_argument(
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|
|
"--rtl-dir", help="Directory where to look for RTL files, recursively"
|
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|
|
|
)
|
|
|
|
|
parser.add_argument(
|
|
|
|
|
"--elf-file",
|
|
|
|
|
required=True,
|
|
|
|
|
help="Program ELF file",
|
|
|
|
|
type=argparse.FileType("rb"),
|
|
|
|
|
)
|
|
|
|
|
action_sub = parser.add_subparsers(dest="action")
|
|
|
|
|
find_refs_parser = action_sub.add_parser(
|
|
|
|
|
"find-refs",
|
|
|
|
|
help="List the references coming from a given list of source sections"
|
|
|
|
|
"to a given list of target sections.",
|
|
|
|
|
)
|
|
|
|
|
find_refs_parser.add_argument(
|
|
|
|
|
"--from-sections", help="comma-separated list of source sections"
|
|
|
|
|
)
|
|
|
|
|
find_refs_parser.add_argument(
|
|
|
|
|
"--to-sections", help="comma-separated list of target sections"
|
|
|
|
|
)
|
|
|
|
|
find_refs_parser.add_argument(
|
|
|
|
|
"--exit-code",
|
|
|
|
|
action="store_true",
|
|
|
|
|
help="If set, exits with non-zero code when any references found",
|
|
|
|
|
)
|
|
|
|
|
action_sub.add_parser(
|
|
|
|
|
"all-refs",
|
|
|
|
|
help="Print the list of all references",
|
|
|
|
|
)
|
|
|
|
|
|
|
|
|
|
parser.parse_args()
|
|
|
|
|
args = parser.parse_args()
|
|
|
|
|
if args.rtl_list:
|
|
|
|
|
with open(args.rtl_list, "r") as rtl_list_file:
|
|
|
|
|
rtl_list = [line.strip for line in rtl_list_file]
|
|
|
|
|
else:
|
|
|
|
|
if not args.rtl_dir:
|
|
|
|
|
raise RuntimeError("Either --rtl-list or --rtl-dir must be specified")
|
|
|
|
|
rtl_list = list(find_files_recursive(args.rtl_dir, ".expand"))
|
|
|
|
|
|
|
|
|
|
if not rtl_list:
|
|
|
|
|
raise RuntimeError("No RTL files specified")
|
|
|
|
|
|
|
|
|
|
_, refs = get_symbols_and_refs(rtl_list, args.elf_file)
|
|
|
|
|
|
|
|
|
|
if args.action == "find-refs":
|
|
|
|
|
from_sections = args.from_sections.split(",") if args.from_sections else []
|
|
|
|
|
to_sections = args.to_sections.split(",") if args.to_sections else []
|
|
|
|
|
found = list_refs_from_to_sections(
|
|
|
|
|
refs, from_sections, to_sections
|
|
|
|
|
)
|
|
|
|
|
if args.exit_code and found:
|
|
|
|
|
raise SystemExit(1)
|
|
|
|
|
elif args.action == "all-refs":
|
|
|
|
|
for r in refs:
|
|
|
|
|
print(str(r))
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
if __name__ == "__main__":
|
|
|
|
|
main()
|
Ivan Grokhotkov