projects/linux·blob f24767ca · refs

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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
9from __future__ import print_function
10import os
11from os import path
12import re
13from subprocess import *
14from optparse import OptionParser, make_option
15
16from perf_trace_context import perf_set_itrace_options, \
17 perf_sample_insn, perf_sample_srccode
18
19# Below are some example commands for using this script.
20#
21# Output disassembly with objdump:
22# perf script -s scripts/python/arm-cs-trace-disasm.py \
23# -- -d objdump -k path/to/vmlinux
24# Output disassembly with llvm-objdump:
25# perf script -s scripts/python/arm-cs-trace-disasm.py \
26# -- -d llvm-objdump-11 -k path/to/vmlinux
27# Output only source line and symbols:
28# perf script -s scripts/python/arm-cs-trace-disasm.py
29
30# Command line parsing.
31option_list = [
32 # formatting options for the bottom entry of the stack
33 make_option("-k", "--vmlinux", dest="vmlinux_name",
34 help="Set path to vmlinux file"),
35 make_option("-d", "--objdump", dest="objdump_name",
36 help="Set path to objdump executable file"),
37 make_option("-v", "--verbose", dest="verbose",
38 action="store_true", default=False,
39 help="Enable debugging log")
40]
41
42parser = OptionParser(option_list=option_list)
43(options, args) = parser.parse_args()
44
45# Initialize global dicts and regular expression
46disasm_cache = dict()
47cpu_data = dict()
48disasm_re = re.compile("^\s*([0-9a-fA-F]+):")
49disasm_func_re = re.compile("^\s*([0-9a-fA-F]+)\s.*:")
50cache_size = 64*1024
51
52glb_source_file_name = None
53glb_line_number = None
54glb_dso = None
55
56def get_optional(perf_dict, field):
57 if field in perf_dict:
58 return perf_dict[field]
59 return "[unknown]"
60
61def get_offset(perf_dict, field):
62 if field in perf_dict:
63 return "+%#x" % perf_dict[field]
64 return ""
65
66def get_dso_file_path(dso_name, dso_build_id):
67 if (dso_name == "[kernel.kallsyms]" or dso_name == "vmlinux"):
68 if (options.vmlinux_name):
69 return options.vmlinux_name;
70 else:
71 return dso_name
72
73 if (dso_name == "[vdso]") :
74 append = "/vdso"
75 else:
76 append = "/elf"
77
78 dso_path = os.environ['PERF_BUILDID_DIR'] + "/" + dso_name + "/" + dso_build_id + append;
79 # Replace duplicate slash chars to single slash char
80 dso_path = dso_path.replace('//', '/', 1)
81 return dso_path
82
83def read_disam(dso_fname, dso_start, start_addr, stop_addr):
84 addr_range = str(start_addr) + ":" + str(stop_addr) + ":" + dso_fname
85
86 # Don't let the cache get too big, clear it when it hits max size
87 if (len(disasm_cache) > cache_size):
88 disasm_cache.clear();
89
90 if addr_range in disasm_cache:
91 disasm_output = disasm_cache[addr_range];
92 else:
93 start_addr = start_addr - dso_start;
94 stop_addr = stop_addr - dso_start;
95 disasm = [ options.objdump_name, "-d", "-z",
96 "--start-address="+format(start_addr,"#x"),
97 "--stop-address="+format(stop_addr,"#x") ]
98 disasm += [ dso_fname ]
99 disasm_output = check_output(disasm).decode('utf-8').split('\n')
100 disasm_cache[addr_range] = disasm_output
101
102 return disasm_output
103
104def print_disam(dso_fname, dso_start, start_addr, stop_addr):
105 for line in read_disam(dso_fname, dso_start, start_addr, stop_addr):
106 m = disasm_func_re.search(line)
107 if m is None:
108 m = disasm_re.search(line)
109 if m is None:
110 continue
111 print("\t" + line)
112
113def print_sample(sample):
114 print("Sample = { cpu: %04d addr: 0x%016x phys_addr: 0x%016x ip: 0x%016x " \
115 "pid: %d tid: %d period: %d time: %d }" % \
116 (sample['cpu'], sample['addr'], sample['phys_addr'], \
117 sample['ip'], sample['pid'], sample['tid'], \
118 sample['period'], sample['time']))
119
120def trace_begin():
121 print('ARM CoreSight Trace Data Assembler Dump')
122
123def trace_end():
124 print('End')
125
126def trace_unhandled(event_name, context, event_fields_dict):
127 print(' '.join(['%s=%s'%(k,str(v))for k,v in sorted(event_fields_dict.items())]))
128
129def common_start_str(comm, sample):
130 sec = int(sample["time"] / 1000000000)
131 ns = sample["time"] % 1000000000
132 cpu = sample["cpu"]
133 pid = sample["pid"]
134 tid = sample["tid"]
135 return "%16s %5u/%-5u [%04u] %9u.%09u " % (comm, pid, tid, cpu, sec, ns)
136
137# This code is copied from intel-pt-events.py for printing source code
138# line and symbols.
139def print_srccode(comm, param_dict, sample, symbol, dso):
140 ip = sample["ip"]
141 if symbol == "[unknown]":
142 start_str = common_start_str(comm, sample) + ("%x" % ip).rjust(16).ljust(40)
143 else:
144 offs = get_offset(param_dict, "symoff")
145 start_str = common_start_str(comm, sample) + (symbol + offs).ljust(40)
146
147 global glb_source_file_name
148 global glb_line_number
149 global glb_dso
150
151 source_file_name, line_number, source_line = perf_sample_srccode(perf_script_context)
152 if source_file_name:
153 if glb_line_number == line_number and glb_source_file_name == source_file_name:
154 src_str = ""
155 else:
156 if len(source_file_name) > 40:
157 src_file = ("..." + source_file_name[-37:]) + " "
158 else:
159 src_file = source_file_name.ljust(41)
160
161 if source_line is None:
162 src_str = src_file + str(line_number).rjust(4) + " <source not found>"
163 else:
164 src_str = src_file + str(line_number).rjust(4) + " " + source_line
165 glb_dso = None
166 elif dso == glb_dso:
167 src_str = ""
168 else:
169 src_str = dso
170 glb_dso = dso
171
172 glb_line_number = line_number
173 glb_source_file_name = source_file_name
174
175 print(start_str, src_str)
176
177def process_event(param_dict):
178 global cache_size
179 global options
180
181 sample = param_dict["sample"]
182 comm = param_dict["comm"]
183
184 name = param_dict["ev_name"]
185 dso = get_optional(param_dict, "dso")
186 dso_bid = get_optional(param_dict, "dso_bid")
187 dso_start = get_optional(param_dict, "dso_map_start")
188 dso_end = get_optional(param_dict, "dso_map_end")
189 symbol = get_optional(param_dict, "symbol")
190
191 if (options.verbose == True):
192 print("Event type: %s" % name)
193 print_sample(sample)
194
195 # If cannot find dso so cannot dump assembler, bail out
196 if (dso == '[unknown]'):
197 return
198
199 # Validate dso start and end addresses
200 if ((dso_start == '[unknown]') or (dso_end == '[unknown]')):
201 print("Failed to find valid dso map for dso %s" % dso)
202 return
203
204 if (name[0:12] == "instructions"):
205 print_srccode(comm, param_dict, sample, symbol, dso)
206 return
207
208 # Don't proceed if this event is not a branch sample, .
209 if (name[0:8] != "branches"):
210 return
211
212 cpu = sample["cpu"]
213 ip = sample["ip"]
214 addr = sample["addr"]
215
216 # Initialize CPU data if it's empty, and directly return back
217 # if this is the first tracing event for this CPU.
218 if (cpu_data.get(str(cpu) + 'addr') == None):
219 cpu_data[str(cpu) + 'addr'] = addr
220 return
221
222 # The format for packet is:
223 #
224 # +------------+------------+------------+
225 # sample_prev: | addr | ip | cpu |
226 # +------------+------------+------------+
227 # sample_next: | addr | ip | cpu |
228 # +------------+------------+------------+
229 #
230 # We need to combine the two continuous packets to get the instruction
231 # range for sample_prev::cpu:
232 #
233 # [ sample_prev::addr .. sample_next::ip ]
234 #
235 # For this purose, sample_prev::addr is stored into cpu_data structure
236 # and read back for 'start_addr' when the new packet comes, and we need
237 # to use sample_next::ip to calculate 'stop_addr', plusing extra 4 for
238 # 'stop_addr' is for the sake of objdump so the final assembler dump can
239 # include last instruction for sample_next::ip.
240 start_addr = cpu_data[str(cpu) + 'addr']
241 stop_addr = ip + 4
242
243 # Record for previous sample packet
244 cpu_data[str(cpu) + 'addr'] = addr
245
246 # Handle CS_ETM_TRACE_ON packet if start_addr=0 and stop_addr=4
247 if (start_addr == 0 and stop_addr == 4):
248 print("CPU%d: CS_ETM_TRACE_ON packet is inserted" % cpu)
249 return
250
251 if (start_addr < int(dso_start) or start_addr > int(dso_end)):
252 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))
253 return
254
255 if (stop_addr < int(dso_start) or stop_addr > int(dso_end)):
256 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))
257 return
258
259 if (options.objdump_name != None):
260 # It doesn't need to decrease virtual memory offset for disassembly
261 # for kernel dso, so in this case we set vm_start to zero.
262 if (dso == "[kernel.kallsyms]"):
263 dso_vm_start = 0
264 else:
265 dso_vm_start = int(dso_start)
266
267 dso_fname = get_dso_file_path(dso, dso_bid)
268 if path.exists(dso_fname):
269 print_disam(dso_fname, dso_vm_start, start_addr, stop_addr)
270 else:
271 print("Failed to find dso %s for address range [ 0x%x .. 0x%x ]" % (dso, start_addr, stop_addr))
272
273 print_srccode(comm, param_dict, sample, symbol, dso)