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Improvements compared to the legacy script: - Encapsulate trace disassembly state in a TraceDisasm class - Automatically search standard kernel debug paths (find_vmlinux()) when -k/--vmlinux is not specified, and query perf.config_get("annotate.objdump") for the default objdump binary. - Bound DISASM_CACHE memory consumption by evicting the cache at 1024 entries and skipping caching of oversized (> 512 lines) objdump outputs. - Use sample.srccode() from the perf extension module to annotate disassembly output with source filenames, line numbers, and source lines. Update the ARM CoreSight disassembly shell test (test_arm_coresight_disasm.sh) to invoke the standalone script. Assisted-by: Antigravity:gemini-3.1-pro Reviewed-by: James Clark Signed-off-by: Ian Rogers --- tools/perf/python/arm-cs-trace-disasm.py | 389 ++++++++++++++++++ .../coresight/test_arm_coresight_disasm.sh | 25 +- 2 files changed, 407 insertions(+), 7 deletions(-) create mode 100755 tools/perf/python/arm-cs-trace-disasm.py diff --git a/tools/perf/python/arm-cs-trace-disasm.py b/tools/perf/python/arm-cs-trace-disasm.py new file mode 100755 index 000000000000..0d95ef3604eb --- /dev/null +++ b/tools/perf/python/arm-cs-trace-disasm.py @@ -0,0 +1,389 @@ +#!/usr/bin/env python3 +# SPDX-License-Identifier: GPL-2.0 +""" +arm-cs-trace-disasm.py: ARM CoreSight Trace Dump With Disassember using perf python module +""" +from __future__ import annotations + +import os +from os import path +import re +from subprocess import CalledProcessError, check_output +import argparse +import platform +import sys +from typing import Dict, List, Optional + +import perf + +# Initialize global dicts and regular expression +DISASM_CACHE: Dict[str, List[str]] = {} +DISASM_RE = re.compile(r"^\s*([0-9a-fA-F]+):") +DISASM_FUNC_RE = re.compile(r"^\s*([0-9a-fA-F]+)\s.*:") +CACHE_SIZE = 1024 +class _State: + sample_idx: int = -1 + source_file_name: Optional[str] = None + line_number: Optional[int] = None + dso: Optional[str] = None + +_STATE = _State() + +KVER = platform.release() +VMLINUX_PATHS = [ + f"/usr/lib/debug/boot/vmlinux-{KVER}.debug", + f"/usr/lib/debug/lib/modules/{KVER}/vmlinux", + f"/lib/modules/{KVER}/build/vmlinux", + f"/usr/lib/debug/boot/vmlinux-{KVER}", + f"/boot/vmlinux-{KVER}", + "/boot/vmlinux", + "vmlinux", +] + +def default_objdump() -> str: + """Return the default objdump path from perf config or 'objdump'.""" + try: + config = perf.config_get("annotate.objdump") + return str(config) if config else "objdump" + except (AttributeError, TypeError): + return "objdump" + +def find_vmlinux() -> Optional[str]: + """Find the vmlinux file in standard paths.""" + if hasattr(find_vmlinux, "path"): + return getattr(find_vmlinux, "path") + + for v in VMLINUX_PATHS: + if os.access(v, os.R_OK): + setattr(find_vmlinux, "path", v) + return v + setattr(find_vmlinux, "path", None) + return None + +def get_dso_file_path(dso_name: str, dso_build_id: str, vmlinux: Optional[str]) -> str: + """Return the path to the DSO file.""" + # Locate DSO binaries in the perf build-id cache (~/.debug or PERF_BUILDID_DIR). + # Perf stores cached binaries under both ///elf + # and the canonical symlink/file layout /.build-id///elf. + buildid_dir = os.environ.get('PERF_BUILDID_DIR') + if not buildid_dir: + buildid_dir = os.path.join(os.environ.get('HOME', ''), '.debug') + + if (dso_name in ("[kernel.kallsyms]", "vmlinux", "kcore") + or dso_name.endswith("/vmlinux") or dso_name.endswith("/kcore")): + if vmlinux: + return vmlinux + if dso_build_id and dso_build_id != "[unknown]" and len(dso_build_id) > 2: + bid_candidate = os.path.join( + buildid_dir, ".build-id", dso_build_id[:2], dso_build_id[2:], "elf" + ) + if os.access(bid_candidate, os.R_OK): + return bid_candidate + for kname in (dso_name, "vmlinux", "[kernel.kallsyms]"): + candidate = os.path.join(buildid_dir, kname.lstrip("/"), dso_build_id, "elf") + if os.access(candidate, os.R_OK): + return candidate + return find_vmlinux() or dso_name + + if dso_name == "[vdso]": + append = "/vdso" + else: + append = "/elf" + + if dso_build_id and dso_build_id != "[unknown]" and len(dso_build_id) > 2: + bid_path = (buildid_dir + "/.build-id/" + dso_build_id[:2] + "/" + + dso_build_id[2:] + append).replace('//', '/') + if os.access(bid_path, os.R_OK): + return bid_path + + dso_path = buildid_dir + "/" + dso_name + "/" + dso_build_id + append + # Replace duplicate slash chars to single slash char + dso_path = dso_path.replace('//', '/') + return dso_path + +def read_disam(dso_fname: str, dso_start: int, start_addr: int, + stop_addr: int, objdump: str) -> List[str]: + """Read disassembly from a DSO file using objdump.""" + if stop_addr <= start_addr or (stop_addr - start_addr) > 0x100000: + return [] + addr_range = f"{start_addr}:{stop_addr}:{dso_start}:{dso_fname}" + + # Don't let the cache get too big, clear it when it hits max size + if len(DISASM_CACHE) > CACHE_SIZE: + DISASM_CACHE.clear() + + if addr_range in DISASM_CACHE: + disasm_output = DISASM_CACHE[addr_range] + else: + start_addr = start_addr - dso_start + stop_addr = stop_addr - dso_start + disasm = [objdump, "-d", "-z", + f"--start-address={start_addr:#x}", + f"--stop-address={stop_addr:#x}"] + disasm += [dso_fname] + try: + disasm_output = check_output(disasm).decode('utf-8', errors='replace').split('\n') + except (CalledProcessError, OSError): + return [] + if len(disasm_output) <= 512: + DISASM_CACHE[addr_range] = disasm_output + + return disasm_output + +def print_disam(dso_fname: str, dso_start: int, start_addr: int, + stop_addr: int, objdump: str) -> None: + """Print disassembly for a given address range.""" + for line in read_disam(dso_fname, dso_start, start_addr, stop_addr, objdump): + m = DISASM_FUNC_RE.search(line) + if m is None: + m = DISASM_RE.search(line) + if m is None: + continue + print(f"\t{line}") + +def print_sample(sample: perf.sample_event) -> None: + """Print sample details.""" + print(f"Sample = {{ cpu: {sample.sample_cpu:04d} addr: {sample.sample_addr:016x} " + f"phys_addr: {sample.sample_phys_addr:016x} ip: {sample.sample_ip:016x} " + f"pid: {sample.sample_pid} tid: {sample.sample_tid} period: {sample.sample_period} " + f"time: {sample.sample_time} index: {_STATE.sample_idx}}}") + +def common_start_str(comm: str, sample: perf.sample_event) -> str: + """Return common start string for sample output.""" + sec = int(sample.sample_time / 1000000000) + ns = sample.sample_time % 1000000000 + cpu = sample.sample_cpu + pid = sample.sample_pid + tid = sample.sample_tid + return f"{comm:>16s} {pid:5d}/{tid:<5d} [{cpu:04d}] {sec:9d}.{ns:09d} " + +def print_srccode(comm: str, sample: perf.sample_event, symbol: str, dso: str) -> None: + """Print source code and symbols for a sample.""" + ip = sample.sample_ip + if symbol == "[unknown]": + start_str = common_start_str(comm, sample) + f"{ip:x}".rjust(16).ljust(40) + else: + symoff = 0 + symoff = getattr(sample, 'sym_offset', 0) or 0 + offs = f"+{symoff:#x}" if symoff != 0 else "" + start_str = common_start_str(comm, sample) + (symbol + offs).ljust(40) + + source_file_name, line_number, source_line = sample.srccode() or (None, 0, None) + if source_file_name: + if _STATE.line_number == line_number and _STATE.source_file_name == source_file_name: + src_str = "" + else: + if len(source_file_name) > 40: + src_file = f"...{source_file_name[-37:]} " + else: + src_file = source_file_name.ljust(41) + + if source_line is None: + src_str = f"{src_file}{line_number:>4d} " + else: + src_str = f"{src_file}{line_number:>4d} {source_line}" + _STATE.dso = None + elif dso == _STATE.dso: + src_str = "" + else: + src_str = dso + _STATE.dso = dso + + _STATE.line_number = line_number + _STATE.source_file_name = source_file_name + + print(start_str, src_str) + +class TraceDisasm: + """Class to handle trace disassembly.""" + def __init__(self, cli_options: argparse.Namespace): + self.options = cli_options + self.sample_idx = -1 + self.cpu_data: Dict[str, int] = {} + self.session: Optional[perf.session] = None + + def process_event(self, sample: perf.sample_event) -> None: + """Process a single perf event.""" + self.sample_idx += 1 + _STATE.sample_idx = self.sample_idx + + if self.options.start_time is not None and sample.sample_time < self.options.start_time: + return + if self.options.stop_time is not None and sample.sample_time > self.options.stop_time: + sys.exit(0) + if self.options.start_sample is not None and self.sample_idx < self.options.start_sample: + return + if self.options.stop_sample is not None and self.sample_idx > self.options.stop_sample: + sys.exit(0) + + ev_name = str(sample.evsel) + if self.options.verbose: + print(f"Event type: {ev_name}") + print_sample(sample) + + dso = getattr(sample, 'dso_long_name', None) or sample.dso or '[unknown]' + symbol = sample.symbol or '[unknown]' + dso_bid = (sample.dso_bid.decode('utf-8') + if isinstance(sample.dso_bid, bytes) + else str(sample.dso_bid or '[unknown]')) + dso_start = sample.map_start + dso_end = sample.map_end + map_pgoff = sample.map_pgoff or 0 + + comm = "[unknown]" + try: + if self.session: + thread_info = self.session.find_thread(sample.sample_pid, sample.sample_tid) + if thread_info: + comm = thread_info.comm() or "[unknown]" + except (TypeError, AttributeError): + pass + + if dso == '[unknown]': + return + + if dso_start is None or dso_end is None: + print(f"Failed to find valid dso map for dso {dso}") + return + + if "instructions" in ev_name: + print_srccode(comm, sample, symbol, dso) + return + + if "branches" not in ev_name: + return + + self._process_branch(sample, comm, symbol, dso, dso_bid, dso_start, dso_end, map_pgoff) + + def _process_branch(self, sample: perf.sample_event, comm: str, symbol: str, dso: str, + dso_bid: str, dso_start: int, dso_end: int, map_pgoff: int) -> None: + """Helper to process branch events.""" + cpu = sample.sample_cpu + ip = sample.sample_ip + addr = sample.sample_addr + + if self.cpu_data.get(str(cpu) + 'addr') is None: + self.cpu_data[str(cpu) + 'addr'] = addr + return + + start_addr = self.cpu_data[str(cpu) + 'addr'] + stop_addr = ip + 4 + + # Record for previous sample packet + self.cpu_data[str(cpu) + 'addr'] = addr + + # Filter out zero start_address. Optionally identify CS_ETM_TRACE_ON packet + if start_addr == 0: + if stop_addr == 4 and self.options.verbose: + print(f"CPU{cpu}: CS_ETM_TRACE_ON packet is inserted") + return + + if start_addr < dso_start or start_addr > dso_end: + print(f"Start address {start_addr:#x} is out of range [ {dso_start:#x} .. " + f"{dso_end:#x} ] for dso {dso}") + return + + if stop_addr < dso_start or stop_addr > dso_end: + print(f"Stop address {stop_addr:#x} is out of range [ {dso_start:#x} .. " + f"{dso_end:#x} ] for dso {dso}") + return + + if self.options.objdump is not None: + # Kernel images (vmlinux / kcore) and non-PIE executables linked at + # the default 0x400000 base already have their virtual load addresses + # baked into the ELF symbol/section headers read by objdump, so + # dso_vm_start and map_pgoff_local must be 0 to avoid subtracting + # map_start from virtual sample addresses. + if (dso in ("[kernel.kallsyms]", "vmlinux", "kcore") + or dso.endswith("/vmlinux") or dso.endswith("/kcore")): + dso_vm_start = 0 + map_pgoff_local = 0 + elif dso_start == 0x400000: + dso_vm_start = 0 + map_pgoff_local = 0 + else: + dso_vm_start = dso_start + map_pgoff_local = map_pgoff + + dso_fname = get_dso_file_path(dso, dso_bid, self.options.vmlinux) + if path.exists(dso_fname): + print_disam(dso_fname, dso_vm_start, start_addr + map_pgoff_local, + stop_addr + map_pgoff_local, self.options.objdump) + else: + print(f"Failed to find dso {dso} for address range [ " + f"{start_addr + map_pgoff_local:#x} .. {stop_addr + map_pgoff_local:#x} ]") + + print_srccode(comm, sample, symbol, dso) + + def run(self) -> None: + """Run the trace disassembly session.""" + input_file = self.options.input or "perf.data" + if input_file != "-" and not os.path.exists(input_file): + print(f"Error: {input_file} not found.", file=sys.stderr) + sys.exit(1) + + print('ARM CoreSight Trace Data Assembler Dump') + try: + session_kwargs = { + "sample": self.process_event, + "itrace": self.options.itrace, + } + if self.options.vmlinux: + session_kwargs["vmlinux"] = self.options.vmlinux + try: + self.session = perf.session(perf.data(input_file), **session_kwargs) + except TypeError: + session_kwargs.pop("vmlinux", None) + self.session = perf.session(perf.data(input_file), **session_kwargs) + except (OSError, ValueError, KeyError, RuntimeError, TypeError, AttributeError) as e: + print(f"Error opening session: {e}", file=sys.stderr) + sys.exit(1) + + try: + self.session.process_events() + except (KeyboardInterrupt, SystemExit): + pass + finally: + # Break the reference cycle between self.session and the bound + # self.process_event callback so the C perf.session object is freed. + self.session = None + print('End') + +if __name__ == "__main__": + def int_arg(v: str) -> int: + """Helper for integer command line arguments.""" + val = int(v) + if val < 0: + raise argparse.ArgumentTypeError("Argument must be a positive integer") + return val + + arg_parser = argparse.ArgumentParser(description="ARM CoreSight Trace Dump With Disassembler") + arg_parser.add_argument("-i", "--input", help="input perf.data file") + arg_parser.add_argument("-k", "--vmlinux", default=os.environ.get("PERF_SYMBOL_VMLINUX"), + help="Set path to vmlinux file. Omit to autodetect") + arg_parser.add_argument("-d", "--objdump", nargs="?", const=default_objdump(), + help="Show disassembly. Can also be used to change the objdump path") + arg_parser.add_argument("-v", "--verbose", action="store_true", help="Enable debugging log") + arg_parser.add_argument("--start-time", type=int_arg, + help="Monotonic clock time of sample to start from.") + arg_parser.add_argument("--stop-time", type=int_arg, + help="Monotonic clock time of sample to stop at.") + arg_parser.add_argument("--itrace", default="b", + help="Instruction tracing options.") + arg_parser.add_argument("--start-sample", type=int_arg, + help="Index of sample to start from.") + arg_parser.add_argument("--stop-sample", type=int_arg, + help="Index of sample to stop at.") + + parsed_options = arg_parser.parse_args() + if (parsed_options.start_time is not None and parsed_options.stop_time is not None and + parsed_options.start_time >= parsed_options.stop_time): + print("--start-time must less than --stop-time") + sys.exit(2) + if (parsed_options.start_sample is not None and parsed_options.stop_sample is not None and + parsed_options.start_sample >= parsed_options.stop_sample): + print("--start-sample must less than --stop-sample") + sys.exit(2) + + td = TraceDisasm(parsed_options) + td.run() diff --git a/tools/perf/tests/shell/coresight/test_arm_coresight_disasm.sh b/tools/perf/tests/shell/coresight/test_arm_coresight_disasm.sh index f3ebad596378..2c04249a3496 100755 --- a/tools/perf/tests/shell/coresight/test_arm_coresight_disasm.sh +++ b/tools/perf/tests/shell/coresight/test_arm_coresight_disasm.sh @@ -1,6 +1,6 @@ #!/bin/bash -# Check Arm CoreSight disassembly script completes without errors (exclusive) # SPDX-License-Identifier: GPL-2.0 +# Check Arm CoreSight disassembly script completes without errors (exclusive) # The disassembly script reconstructs ranges of instructions and gives these to objdump to # decode. objdump doesn't like ranges that go backwards, but these are a good indication @@ -20,11 +20,23 @@ skip_if_no_cs_etm_event || exit 2 set -e glb_err=1 +# Relative path works whether it's installed or running from repo +if [ -n "$PERF_EXEC_PATH" ] && [ -e "$PERF_EXEC_PATH/python/arm-cs-trace-disasm.py" ]; then + script_path="$PERF_EXEC_PATH/python/arm-cs-trace-disasm.py" +else + script_path=$(dirname "$0")/../../../python/arm-cs-trace-disasm.py +fi + +# shellcheck source=lib/setup_python.sh +. "$(dirname "$0")"/../lib/setup_python.sh +$PYTHON -c "import perf" 2>/dev/null || { + echo "Skipping test, perf python module not found" + exit 2 +} + perfdata_dir=$(mktemp -d /tmp/__perf_test.perf.data.XXXXX) perfdata=${perfdata_dir}/perf.data file=$(mktemp /tmp/temporary_file.XXXXX) -# Relative path works whether it's installed or running from repo -script_path=$(dirname "$0")/../../../scripts/python/arm-cs-trace-disasm.py cleanup_files() { @@ -44,8 +56,8 @@ branch_search='[[:space:]](bl|b(\.(eq|ne|cs|cc|mi|pl|vs|vc|hi|ls|ge|lt|gt|le|al) if [ "$(id -u)" == 0 ] && [ -e /proc/kcore ]; then echo "Testing kernel disassembly" perf record -o ${perfdata} -e cs_etm//k --kcore -Se -m,64K -- touch $file > /dev/null 2>&1 - perf script -i ${perfdata} --itrace=b -s python:${script_path} -- \ - -d --stop-sample=2 -k ${perfdata}/kcore_dir/kcore 2> /dev/null > ${file} + $PYTHON ${script_path} -i ${perfdata} --itrace=b -d --stop-sample=2 \ + -k ${perfdata}/kcore_dir/kcore 2> /dev/null > ${file} grep -q -E ${branch_search} ${file} echo "Found kernel branches" else @@ -56,8 +68,7 @@ fi ## Test user ## echo "Testing userspace disassembly" perf record -o ${perfdata} -e cs_etm//u -Se -m,64K -- touch $file > /dev/null 2>&1 -perf script -i ${perfdata} --itrace=b -s python:${script_path} -- \ - -d --stop-sample=2 2> /dev/null > ${file} +$PYTHON ${script_path} -i ${perfdata} -d --stop-sample=2 2> /dev/null > ${file} grep -q -E ${branch_search} ${file} echo "Found userspace branches" -- 2.56.0.rc1.310.g51773c2048-goog