# SPDX-License-Identifier: GPL-2.0
# arm-cs-trace-disasm.py: ARM CoreSight Trace Dump With Disassember
#
# Author: Tor Jeremiassen <[email protected]>
# Mathieu Poirier <[email protected]>
# Leo Yan <[email protected]>
# Al Grant <[email protected]>
from __future__ import print_function
import os
from os import path
import re
from subprocess import *
from optparse import OptionParser, make_option
from perf_trace_context import perf_set_itrace_options, \
perf_sample_insn, perf_sample_srccode
# Below are some example commands for using this script.
#
# Output disassembly with objdump:
# perf script -s scripts/python/arm-cs-trace-disasm.py \
# -- -d objdump -k path/to/vmlinux
# Output disassembly with llvm-objdump:
# perf script -s scripts/python/arm-cs-trace-disasm.py \
# -- -d llvm-objdump-11 -k path/to/vmlinux
# Output only source line and symbols:
# perf script -s scripts/python/arm-cs-trace-disasm.py
# Command line parsing.
option_list = [
# formatting options for the bottom entry of the stack
make_option("-k", "--vmlinux", dest="vmlinux_name",
help="Set path to vmlinux file"),
make_option("-d", "--objdump", dest="objdump_name",
help="Set path to objdump executable file"),
make_option("-v", "--verbose", dest="verbose",
action="store_true", default=False,
help="Enable debugging log")
]
parser = OptionParser(option_list=option_list)
(options, args) = parser.parse_args()
# Initialize global dicts and regular expression
disasm_cache = dict()
cpu_data = dict()
disasm_re = re.compile(r"^\s*([0-9a-fA-F]+):")
disasm_func_re = re.compile(r"^\s*([0-9a-fA-F]+)\s.*:")
cache_size = 64*1024
glb_source_file_name = None
glb_line_number = None
glb_dso = None
def get_optional(perf_dict, field):
if field in perf_dict:
return perf_dict[field]
return "[unknown]"
def get_offset(perf_dict, field):
if field in perf_dict:
return "+%#x" % perf_dict[field]
return ""
def get_dso_file_path(dso_name, dso_build_id):
if (dso_name == "[kernel.kallsyms]" or dso_name == "vmlinux"):
if (options.vmlinux_name):
return options.vmlinux_name;
else:
return dso_name
if (dso_name == "[vdso]") :
append = "/vdso"
else:
append = "/elf"
dso_path = os.environ['PERF_BUILDID_DIR'] + "/" + dso_name + "/" + dso_build_id + append;
# Replace duplicate slash chars to single slash char
dso_path = dso_path.replace('//', '/', 1)
return dso_path
def read_disam(dso_fname, dso_start, start_addr, stop_addr):
addr_range = str(start_addr) + ":" + str(stop_addr) + ":" + 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 = [ options.objdump_name, "-d", "-z",
"--start-address="+format(start_addr,"#x"),
"--stop-address="+format(stop_addr,"#x") ]
disasm += [ dso_fname ]
disasm_output = check_output(disasm).decode('utf-8').split('\n')
disasm_cache[addr_range] = disasm_output
return disasm_output
def print_disam(dso_fname, dso_start, start_addr, stop_addr):
for line in read_disam(dso_fname, dso_start, start_addr, stop_addr):
m = disasm_func_re.search(line)
if m is None:
m = disasm_re.search(line)
if m is None:
continue
print("\t" + line)
def print_sample(sample):
print("Sample = { cpu: %04d addr: 0x%016x phys_addr: 0x%016x ip: 0x%016x " \
"pid: %d tid: %d period: %d time: %d }" % \
(sample['cpu'], sample['addr'], sample['phys_addr'], \
sample['ip'], sample['pid'], sample['tid'], \
sample['period'], sample['time']))
def trace_begin():
print('ARM CoreSight Trace Data Assembler Dump')
def trace_end():
print('End')
def trace_unhandled(event_name, context, event_fields_dict):
print(' '.join(['%s=%s'%(k,str(v))for k,v in sorted(event_fields_dict.items())]))
def common_start_str(comm, sample):
sec = int(sample["time"] / 1000000000)
ns = sample["time"] % 1000000000
cpu = sample["cpu"]
pid = sample["pid"]
tid = sample["tid"]
return "%16s %5u/%-5u [%04u] %9u.%09u " % (comm, pid, tid, cpu, sec, ns)
# This code is copied from intel-pt-events.py for printing source code
# line and symbols.
def print_srccode(comm, param_dict, sample, symbol, dso):
ip = sample["ip"]
if symbol == "[unknown]":
start_str = common_start_str(comm, sample) + ("%x" % ip).rjust(16).ljust(40)
else:
offs = get_offset(param_dict, "symoff")
start_str = common_start_str(comm, sample) + (symbol + offs).ljust(40)
global glb_source_file_name
global glb_line_number
global glb_dso
source_file_name, line_number, source_line = perf_sample_srccode(perf_script_context)
if source_file_name:
if glb_line_number == line_number and glb_source_file_name == source_file_name:
src_str = ""
else:
if len(source_file_name) > 40:
src_file = ("..." + source_file_name[-37:]) + " "
else:
src_file = source_file_name.ljust(41)
if source_line is None:
src_str = src_file + str(line_number).rjust(4) + " <source not found>"
else:
src_str = src_file + str(line_number).rjust(4) + " " + source_line
glb_dso = None
elif dso == glb_dso:
src_str = ""
else:
src_str = dso
glb_dso = dso
glb_line_number = line_number
glb_source_file_name = source_file_name
print(start_str, src_str)
def process_event(param_dict):
global cache_size
global options
sample = param_dict["sample"]
comm = param_dict["comm"]
name = param_dict["ev_name"]
dso = get_optional(param_dict, "dso")
dso_bid = get_optional(param_dict, "dso_bid")
dso_start = get_optional(param_dict, "dso_map_start")
dso_end = get_optional(param_dict, "dso_map_end")
symbol = get_optional(param_dict, "symbol")
cpu = sample["cpu"]
ip = sample["ip"]
addr = sample["addr"]
if (options.verbose == True):
print("Event type: %s" % name)
print_sample(sample)
# Initialize CPU data if it's empty, and directly return back
# if this is the first tracing event for this CPU.
if (cpu_data.get(str(cpu) + 'addr') == None):
cpu_data[str(cpu) + 'addr'] = addr
return
# If cannot find dso so cannot dump assembler, bail out
if (dso == '[unknown]'):
return
# Validate dso start and end addresses
if ((dso_start == '[unknown]') or (dso_end == '[unknown]')):
print("Failed to find valid dso map for dso %s" % dso)
return
if (name[0:12] == "instructions"):
print_srccode(comm, param_dict, sample, symbol, dso)
return
# Don't proceed if this event is not a branch sample, .
if (name[0:8] != "branches"):
return
# The format for packet is:
#
# +------------+------------+------------+
# sample_prev: | addr | ip | cpu |
# +------------+------------+------------+
# sample_next: | addr | ip | cpu |
# +------------+------------+------------+
#
# We need to combine the two continuous packets to get the instruction
# range for sample_prev::cpu:
#
# [ sample_prev::addr .. sample_next::ip ]
#
# For this purose, sample_prev::addr is stored into cpu_data structure
# and read back for 'start_addr' when the new packet comes, and we need
# to use sample_next::ip to calculate 'stop_addr', plusing extra 4 for
# 'stop_addr' is for the sake of objdump so the final assembler dump can
# include last instruction for sample_next::ip.
start_addr = cpu_data[str(cpu) + 'addr']
stop_addr = ip + 4
# Record for previous sample packet
cpu_data[str(cpu) + 'addr'] = addr
# Handle CS_ETM_TRACE_ON packet if start_addr=0 and stop_addr=4
if (start_addr == 0 and stop_addr == 4):
print("CPU%d: CS_ETM_TRACE_ON packet is inserted" % cpu)
return
if (start_addr < int(dso_start) or start_addr > int(dso_end)):
print("Start address 0x%x is out of range [ 0x%x .. 0x%x ] for dso %s" % (start_addr, int(dso_start), int(dso_end), dso))
return
if (stop_addr < int(dso_start) or stop_addr > int(dso_end)):
print("Stop address 0x%x is out of range [ 0x%x .. 0x%x ] for dso %s" % (stop_addr, int(dso_start), int(dso_end), dso))
return
if (options.objdump_name != None):
# It doesn't need to decrease virtual memory offset for disassembly
# for kernel dso and executable file dso, so in this case we set
# vm_start to zero.
if (dso == "[kernel.kallsyms]" or dso_start == 0x400000):
dso_vm_start = 0
else:
dso_vm_start = int(dso_start)
dso_fname = get_dso_file_path(dso, dso_bid)
if path.exists(dso_fname):
print_disam(dso_fname, dso_vm_start, start_addr, stop_addr)
else:
print("Failed to find dso %s for address range [ 0x%x .. 0x%x ]" % (dso, start_addr, stop_addr))
print_srccode(comm, param_dict, sample, symbol, dso)
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