tools/perf/scripts/python/arm-cs-trace-disasm.py

   1 # SPDX-License-Identifier: GPL-2.0
   2 # arm-cs-trace-disasm.py: ARM CoreSight Trace Dump With Disassember
   3 #
   4 # Author: Tor Jeremiassen <[email protected]>
   5 #         Mathieu Poirier <[email protected]>
   6 #         Leo Yan <[email protected]>
   7 #         Al Grant <[email protected]>
   8
   9 from __future__ import print_function
  10 import os
  11 from os import path
  12 import re
  13 from subprocess import *
  14 import argparse
  15 import platform
  16
  17 from perf_trace_context import perf_sample_srccode, perf_config_get
  18
  19 # Below are some example commands for using this script.
  20 # Note a --kcore recording is required for accurate decode
  21 # due to the alternatives patching mechanism. However this
  22 # script only supports reading vmlinux for disassembly dump,
  23 # meaning that any patched instructions will appear
  24 # as unpatched, but the instruction ranges themselves will
  25 # be correct. In addition to this, source line info comes
  26 # from Perf, and when using kcore there is no debug info. The
  27 # following lists the supported features in each mode:
  28 #
  29 # +-----------+-----------------+------------------+------------------+
  30 # | Recording | Accurate decode | Source line dump | Disassembly dump |
  31 # +-----------+-----------------+------------------+------------------+
  32 # | --kcore   | yes             | no               | yes              |
  33 # | normal    | no              | yes              | yes              |
  34 # +-----------+-----------------+------------------+------------------+
  35 #
  36 # Output disassembly with objdump and auto detect vmlinux
  37 # (when running on same machine.)
  38 #  perf script -s scripts/python/arm-cs-trace-disasm.py -d
  39 #
  40 # Output disassembly with llvm-objdump:
  41 #  perf script -s scripts/python/arm-cs-trace-disasm.py \
  42 #               -- -d llvm-objdump-11 -k path/to/vmlinux
  43 #
  44 # Output only source line and symbols:
  45 #  perf script -s scripts/python/arm-cs-trace-disasm.py
  46
  47 def default_objdump():
  48         config = perf_config_get("annotate.objdump")
  49         return config if config else "objdump"
  50
  51 # Command line parsing.
  52 def int_arg(v):
  53         v = int(v)
  54         if v < 0:
  55                 raise argparse.ArgumentTypeError("Argument must be a positive integer")
  56         return v
  57
  58 args = argparse.ArgumentParser()
  59 args.add_argument("-k", "--vmlinux",
  60                   help="Set path to vmlinux file. Omit to autodetect if running on same machine")
  61 args.add_argument("-d", "--objdump", nargs="?", const=default_objdump(),
  62                   help="Show disassembly. Can also be used to change the objdump path"),
  63 args.add_argument("-v", "--verbose", action="store_true", help="Enable debugging log")
  64 args.add_argument("--start-time", type=int_arg, help="Monotonic clock time of sample to start from. "
  65                   "See 'time' field on samples in -v mode.")
  66 args.add_argument("--stop-time", type=int_arg, help="Monotonic clock time of sample to stop at. "
  67                   "See 'time' field on samples in -v mode.")
  68 args.add_argument("--start-sample", type=int_arg, help="Index of sample to start from. "
  69                   "See 'index' field on samples in -v mode.")
  70 args.add_argument("--stop-sample", type=int_arg, help="Index of sample to stop at. "
  71                   "See 'index' field on samples in -v mode.")
  72
  73 options = args.parse_args()
  74 if (options.start_time and options.stop_time and
  75     options.start_time >= options.stop_time):
  76         print("--start-time must less than --stop-time")
  77         exit(2)
  78 if (options.start_sample and options.stop_sample and
  79     options.start_sample >= options.stop_sample):
  80         print("--start-sample must less than --stop-sample")
  81         exit(2)
  82
  83 # Initialize global dicts and regular expression
  84 disasm_cache = dict()
  85 cpu_data = dict()
  86 disasm_re = re.compile(r"^\s*([0-9a-fA-F]+):")
  87 disasm_func_re = re.compile(r"^\s*([0-9a-fA-F]+)\s.*:")
  88 cache_size = 64*1024
  89 sample_idx = -1
  90
  91 glb_source_file_name    = None
  92 glb_line_number         = None
  93 glb_dso                 = None
  94
  95 kver = platform.release()
  96 vmlinux_paths = [
  97         f"/usr/lib/debug/boot/vmlinux-{kver}.debug",
  98         f"/usr/lib/debug/lib/modules/{kver}/vmlinux",
  99         f"/lib/modules/{kver}/build/vmlinux",
 100         f"/usr/lib/debug/boot/vmlinux-{kver}",
 101         f"/boot/vmlinux-{kver}",
 102         f"/boot/vmlinux",
 103         f"vmlinux"
 104 ]
 105
 106 def get_optional(perf_dict, field):
 107        if field in perf_dict:
 108                return perf_dict[field]
 109        return "[unknown]"
 110
 111 def get_offset(perf_dict, field):
 112         if field in perf_dict:
 113                 return "+%#x" % perf_dict[field]
 114         return ""
 115
 116 def find_vmlinux():
 117         if hasattr(find_vmlinux, "path"):
 118                 return find_vmlinux.path
 119
 120         for v in vmlinux_paths:
 121                 if os.access(v, os.R_OK):
 122                         find_vmlinux.path = v
 123                         break
 124         else:
 125                 find_vmlinux.path = None
 126
 127         return find_vmlinux.path
 128
 129 def get_dso_file_path(dso_name, dso_build_id):
 130         if (dso_name == "[kernel.kallsyms]" or dso_name == "vmlinux"):
 131                 if (options.vmlinux):
 132                         return options.vmlinux;
 133                 else:
 134                         return find_vmlinux() if find_vmlinux() else dso_name
 135
 136         if (dso_name == "[vdso]") :
 137                 append = "/vdso"
 138         else:
 139                 append = "/elf"
 140
 141         dso_path = os.environ['PERF_BUILDID_DIR'] + "/" + dso_name + "/" + dso_build_id + append;
 142         # Replace duplicate slash chars to single slash char
 143         dso_path = dso_path.replace('//', '/', 1)
 144         return dso_path
 145
 146 def read_disam(dso_fname, dso_start, start_addr, stop_addr):
 147         addr_range = str(start_addr) + ":" + str(stop_addr) + ":" + dso_fname
 148
 149         # Don't let the cache get too big, clear it when it hits max size
 150         if (len(disasm_cache) > cache_size):
 151                 disasm_cache.clear();
 152
 153         if addr_range in disasm_cache:
 154                 disasm_output = disasm_cache[addr_range];
 155         else:
 156                 start_addr = start_addr - dso_start;
 157                 stop_addr = stop_addr - dso_start;
 158                 disasm = [ options.objdump, "-d", "-z",
 159                            "--start-address="+format(start_addr,"#x"),
 160                            "--stop-address="+format(stop_addr,"#x") ]
 161                 disasm += [ dso_fname ]
 162                 disasm_output = check_output(disasm).decode('utf-8').split('\n')
 163                 disasm_cache[addr_range] = disasm_output
 164
 165         return disasm_output
 166
 167 def print_disam(dso_fname, dso_start, start_addr, stop_addr):
 168         for line in read_disam(dso_fname, dso_start, start_addr, stop_addr):
 169                 m = disasm_func_re.search(line)
 170                 if m is None:
 171                         m = disasm_re.search(line)
 172                         if m is None:
 173                                 continue
 174                 print("\t" + line)
 175
 176 def print_sample(sample):
 177         print("Sample = { cpu: %04d addr: 0x%016x phys_addr: 0x%016x ip: 0x%016x " \
 178               "pid: %d tid: %d period: %d time: %d index: %d}" % \
 179               (sample['cpu'], sample['addr'], sample['phys_addr'], \
 180                sample['ip'], sample['pid'], sample['tid'], \
 181                sample['period'], sample['time'], sample_idx))
 182
 183 def trace_begin():
 184         print('ARM CoreSight Trace Data Assembler Dump')
 185
 186 def trace_end():
 187         print('End')
 188
 189 def trace_unhandled(event_name, context, event_fields_dict):
 190         print(' '.join(['%s=%s'%(k,str(v))for k,v in sorted(event_fields_dict.items())]))
 191
 192 def common_start_str(comm, sample):
 193         sec = int(sample["time"] / 1000000000)
 194         ns = sample["time"] % 1000000000
 195         cpu = sample["cpu"]
 196         pid = sample["pid"]
 197         tid = sample["tid"]
 198         return "%16s %5u/%-5u [%04u] %9u.%09u  " % (comm, pid, tid, cpu, sec, ns)
 199
 200 # This code is copied from intel-pt-events.py for printing source code
 201 # line and symbols.
 202 def print_srccode(comm, param_dict, sample, symbol, dso):
 203         ip = sample["ip"]
 204         if symbol == "[unknown]":
 205                 start_str = common_start_str(comm, sample) + ("%x" % ip).rjust(16).ljust(40)
 206         else:
 207                 offs = get_offset(param_dict, "symoff")
 208                 start_str = common_start_str(comm, sample) + (symbol + offs).ljust(40)
 209
 210         global glb_source_file_name
 211         global glb_line_number
 212         global glb_dso
 213
 214         source_file_name, line_number, source_line = perf_sample_srccode(perf_script_context)
 215         if source_file_name:
 216                 if glb_line_number == line_number and glb_source_file_name == source_file_name:
 217                         src_str = ""
 218                 else:
 219                         if len(source_file_name) > 40:
 220                                 src_file = ("..." + source_file_name[-37:]) + " "
 221                         else:
 222                                 src_file = source_file_name.ljust(41)
 223
 224                         if source_line is None:
 225                                 src_str = src_file + str(line_number).rjust(4) + " <source not found>"
 226                         else:
 227                                 src_str = src_file + str(line_number).rjust(4) + " " + source_line
 228                 glb_dso = None
 229         elif dso == glb_dso:
 230                 src_str = ""
 231         else:
 232                 src_str = dso
 233                 glb_dso = dso
 234
 235         glb_line_number = line_number
 236         glb_source_file_name = source_file_name
 237
 238         print(start_str, src_str)
 239
 240 def process_event(param_dict):
 241         global cache_size
 242         global options
 243         global sample_idx
 244
 245         sample = param_dict["sample"]
 246         comm = param_dict["comm"]
 247
 248         name = param_dict["ev_name"]
 249         dso = get_optional(param_dict, "dso")
 250         dso_bid = get_optional(param_dict, "dso_bid")
 251         dso_start = get_optional(param_dict, "dso_map_start")
 252         dso_end = get_optional(param_dict, "dso_map_end")
 253         symbol = get_optional(param_dict, "symbol")
 254         map_pgoff = get_optional(param_dict, "map_pgoff")
 255         # check for valid map offset
 256         if (str(map_pgoff) == '[unknown]'):
 257                 map_pgoff = 0
 258
 259         cpu = sample["cpu"]
 260         ip = sample["ip"]
 261         addr = sample["addr"]
 262
 263         sample_idx += 1
 264
 265         if (options.start_time and sample["time"] < options.start_time):
 266                 return
 267         if (options.stop_time and sample["time"] > options.stop_time):
 268                 exit(0)
 269         if (options.start_sample and sample_idx < options.start_sample):
 270                 return
 271         if (options.stop_sample and sample_idx > options.stop_sample):
 272                 exit(0)
 273
 274         if (options.verbose == True):
 275                 print("Event type: %s" % name)
 276                 print_sample(sample)
 277
 278         # Initialize CPU data if it's empty, and directly return back
 279         # if this is the first tracing event for this CPU.
 280         if (cpu_data.get(str(cpu) + 'addr') == None):
 281                 cpu_data[str(cpu) + 'addr'] = addr
 282                 return
 283
 284         # If cannot find dso so cannot dump assembler, bail out
 285         if (dso == '[unknown]'):
 286                 return
 287
 288         # Validate dso start and end addresses
 289         if ((dso_start == '[unknown]') or (dso_end == '[unknown]')):
 290                 print("Failed to find valid dso map for dso %s" % dso)
 291                 return
 292
 293         if (name[0:12] == "instructions"):
 294                 print_srccode(comm, param_dict, sample, symbol, dso)
 295                 return
 296
 297         # Don't proceed if this event is not a branch sample, .
 298         if (name[0:8] != "branches"):
 299                 return
 300
 301         # The format for packet is:
 302         #
 303         #                 +------------+------------+------------+
 304         #  sample_prev:   |    addr    |    ip      |    cpu     |
 305         #                 +------------+------------+------------+
 306         #  sample_next:   |    addr    |    ip      |    cpu     |
 307         #                 +------------+------------+------------+
 308         #
 309         # We need to combine the two continuous packets to get the instruction
 310         # range for sample_prev::cpu:
 311         #
 312         #     [ sample_prev::addr .. sample_next::ip ]
 313         #
 314         # For this purose, sample_prev::addr is stored into cpu_data structure
 315         # and read back for 'start_addr' when the new packet comes, and we need
 316         # to use sample_next::ip to calculate 'stop_addr', plusing extra 4 for
 317         # 'stop_addr' is for the sake of objdump so the final assembler dump can
 318         # include last instruction for sample_next::ip.
 319         start_addr = cpu_data[str(cpu) + 'addr']
 320         stop_addr  = ip + 4
 321
 322         # Record for previous sample packet
 323         cpu_data[str(cpu) + 'addr'] = addr
 324
 325         # Filter out zero start_address. Optionally identify CS_ETM_TRACE_ON packet
 326         if (start_addr == 0):
 327                 if ((stop_addr == 4) and (options.verbose == True)):
 328                         print("CPU%d: CS_ETM_TRACE_ON packet is inserted" % cpu)
 329                 return
 330
 331         if (start_addr < int(dso_start) or start_addr > int(dso_end)):
 332                 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))
 333                 return
 334
 335         if (stop_addr < int(dso_start) or stop_addr > int(dso_end)):
 336                 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))
 337                 return
 338
 339         if (options.objdump != None):
 340                 # It doesn't need to decrease virtual memory offset for disassembly
 341                 # for kernel dso and executable file dso, so in this case we set
 342                 # vm_start to zero.
 343                 if (dso == "[kernel.kallsyms]" or dso_start == 0x400000):
 344                         dso_vm_start = 0
 345                         map_pgoff = 0
 346                 else:
 347                         dso_vm_start = int(dso_start)
 348
 349                 dso_fname = get_dso_file_path(dso, dso_bid)
 350                 if path.exists(dso_fname):
 351                         print_disam(dso_fname, dso_vm_start, start_addr + map_pgoff, stop_addr + map_pgoff)
 352                 else:
 353                         print("Failed to find dso %s for address range [ 0x%x .. 0x%x ]" % (dso, start_addr + map_pgoff, stop_addr + map_pgoff))
 354
 355         print_srccode(comm, param_dict, sample, symbol, dso)