| Message ID | 20240912151143.1264483-6-james.clark@linaro.org (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | perf: cs-etm: Coresight decode and disassembly improvements | expand |
On 9/12/24 16:11, James Clark wrote: > > Make vmlinux detection automatic and use Perf's default objdump > when -d is specified. This will make it easier for a test to use the > script without having to provide arguments. And similarly for users. > > Signed-off-by: James Clark <james.clark@linaro.org> Reviewed-by: Leo Yan <leo.yan@arm.com> > --- > .../scripts/python/arm-cs-trace-disasm.py | 63 ++++++++++++++++--- > 1 file changed, 55 insertions(+), 8 deletions(-) > > diff --git a/tools/perf/scripts/python/arm-cs-trace-disasm.py b/tools/perf/scripts/python/arm-cs-trace-disasm.py > index 45f682a8b34d..02e957d037ea 100755 > --- a/tools/perf/scripts/python/arm-cs-trace-disasm.py > +++ b/tools/perf/scripts/python/arm-cs-trace-disasm.py > @@ -12,25 +12,48 @@ from os import path > import re > from subprocess import * > import argparse > +import platform > > -from perf_trace_context import perf_set_itrace_options, \ > - perf_sample_insn, perf_sample_srccode > +from perf_trace_context import perf_sample_srccode, perf_config_get > > # Below are some example commands for using this script. > +# Note a --kcore recording is required for accurate decode > +# due to the alternatives patching mechanism. However this > +# script only supports reading vmlinux for disassembly dump, > +# meaning that any patched instructions will appear > +# as unpatched, but the instruction ranges themselves will > +# be correct. In addition to this, source line info comes > +# from Perf, and when using kcore there is no debug info. The > +# following lists the supported features in each mode: > +# > +# +-----------+-----------------+------------------+------------------+ > +# | Recording | Accurate decode | Source line dump | Disassembly dump | > +# +-----------+-----------------+------------------+------------------+ > +# | --kcore | yes | no | yes | > +# | normal | no | yes | yes | > +# +-----------+-----------------+------------------+------------------+ > +# > +# Output disassembly with objdump and auto detect vmlinux > +# (when running on same machine.) > +# perf script -s scripts/python/arm-cs-trace-disasm.py -d > # > -# 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 > > +def default_objdump(): > + config = perf_config_get("annotate.objdump") > + return config if config else "objdump" > + > # Command line parsing. > args = argparse.ArgumentParser() > -args.add_argument("-k", "--vmlinux", help="Set path to vmlinux file") > -args.add_argument("-d", "--objdump", help="Set path to objdump executable file"), > +args.add_argument("-k", "--vmlinux", > + help="Set path to vmlinux file. Omit to autodetect if running on same machine") > +args.add_argument("-d", "--objdump", nargs="?", const=default_objdump(), > + help="Show disassembly. Can also be used to change the objdump path"), > args.add_argument("-v", "--verbose", action="store_true", help="Enable debugging log") > options = args.parse_args() > > @@ -45,6 +68,17 @@ glb_source_file_name = None > glb_line_number = None > glb_dso = None > > +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}", > + f"/boot/vmlinux", > + f"vmlinux" > +] > + > def get_optional(perf_dict, field): > if field in perf_dict: > return perf_dict[field] > @@ -55,12 +89,25 @@ def get_offset(perf_dict, field): > return "+%#x" % perf_dict[field] > return "" > > +def find_vmlinux(): > + if hasattr(find_vmlinux, "path"): > + return find_vmlinux.path > + > + for v in vmlinux_paths: > + if os.access(v, os.R_OK): > + find_vmlinux.path = v > + break > + else: > + find_vmlinux.path = None > + > + return find_vmlinux.path > + > def get_dso_file_path(dso_name, dso_build_id): > if (dso_name == "[kernel.kallsyms]" or dso_name == "vmlinux"): > if (options.vmlinux): > return options.vmlinux; > else: > - return dso_name > + return find_vmlinux() if find_vmlinux() else dso_name > > if (dso_name == "[vdso]") : > append = "/vdso" > -- > 2.34.1 >
diff --git a/tools/perf/scripts/python/arm-cs-trace-disasm.py b/tools/perf/scripts/python/arm-cs-trace-disasm.py index 45f682a8b34d..02e957d037ea 100755 --- a/tools/perf/scripts/python/arm-cs-trace-disasm.py +++ b/tools/perf/scripts/python/arm-cs-trace-disasm.py @@ -12,25 +12,48 @@ from os import path import re from subprocess import * import argparse +import platform -from perf_trace_context import perf_set_itrace_options, \ - perf_sample_insn, perf_sample_srccode +from perf_trace_context import perf_sample_srccode, perf_config_get # Below are some example commands for using this script. +# Note a --kcore recording is required for accurate decode +# due to the alternatives patching mechanism. However this +# script only supports reading vmlinux for disassembly dump, +# meaning that any patched instructions will appear +# as unpatched, but the instruction ranges themselves will +# be correct. In addition to this, source line info comes +# from Perf, and when using kcore there is no debug info. The +# following lists the supported features in each mode: +# +# +-----------+-----------------+------------------+------------------+ +# | Recording | Accurate decode | Source line dump | Disassembly dump | +# +-----------+-----------------+------------------+------------------+ +# | --kcore | yes | no | yes | +# | normal | no | yes | yes | +# +-----------+-----------------+------------------+------------------+ +# +# Output disassembly with objdump and auto detect vmlinux +# (when running on same machine.) +# perf script -s scripts/python/arm-cs-trace-disasm.py -d # -# 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 +def default_objdump(): + config = perf_config_get("annotate.objdump") + return config if config else "objdump" + # Command line parsing. args = argparse.ArgumentParser() -args.add_argument("-k", "--vmlinux", help="Set path to vmlinux file") -args.add_argument("-d", "--objdump", help="Set path to objdump executable file"), +args.add_argument("-k", "--vmlinux", + help="Set path to vmlinux file. Omit to autodetect if running on same machine") +args.add_argument("-d", "--objdump", nargs="?", const=default_objdump(), + help="Show disassembly. Can also be used to change the objdump path"), args.add_argument("-v", "--verbose", action="store_true", help="Enable debugging log") options = args.parse_args() @@ -45,6 +68,17 @@ glb_source_file_name = None glb_line_number = None glb_dso = None +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}", + f"/boot/vmlinux", + f"vmlinux" +] + def get_optional(perf_dict, field): if field in perf_dict: return perf_dict[field] @@ -55,12 +89,25 @@ def get_offset(perf_dict, field): return "+%#x" % perf_dict[field] return "" +def find_vmlinux(): + if hasattr(find_vmlinux, "path"): + return find_vmlinux.path + + for v in vmlinux_paths: + if os.access(v, os.R_OK): + find_vmlinux.path = v + break + else: + find_vmlinux.path = None + + return find_vmlinux.path + def get_dso_file_path(dso_name, dso_build_id): if (dso_name == "[kernel.kallsyms]" or dso_name == "vmlinux"): if (options.vmlinux): return options.vmlinux; else: - return dso_name + return find_vmlinux() if find_vmlinux() else dso_name if (dso_name == "[vdso]") : append = "/vdso"
Make vmlinux detection automatic and use Perf's default objdump when -d is specified. This will make it easier for a test to use the script without having to provide arguments. And similarly for users. Signed-off-by: James Clark <james.clark@linaro.org> --- .../scripts/python/arm-cs-trace-disasm.py | 63 ++++++++++++++++--- 1 file changed, 55 insertions(+), 8 deletions(-)