On Fri, Jun 01, 2018 at 05:58:40PM +0800, Leo Yan wrote:
This commit documents CoreSight trace disassembler usage and gives example for it.
Signed-off-by: Leo Yan leo.yan@linaro.org
Documentation/trace/coresight.txt | 52 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 52 insertions(+)
diff --git a/Documentation/trace/coresight.txt b/Documentation/trace/coresight.txt index 6f0120c..b8f2359 100644 --- a/Documentation/trace/coresight.txt +++ b/Documentation/trace/coresight.txt @@ -381,3 +381,55 @@ sort example is from the AutoFDO tutorial (https://gcc.gnu.org/wiki/AutoFDO/Tuto $ taskset -c 2 ./sort_autofdo Bubble sorting array of 30000 elements 5806 ms
+Tracing data disassembler +-------------------------
+'perf script' supports to use script to parse tracing packet and rely on +'objdump' for disassembled lines, this can convert tracing data to readable
Isn't better to use an arch specific objdump, something like aarch64-linux-gnu-objdump?
+program execution flow for easily reviewing tracing data.
+The CoreSight trace disassembler is located in the folder: +tools/perf/scripts/python/arm-cs-trace-disasm.py. This script support below +options:
- -d, --objdump: Set path to objdump executable, this option is
mandatory.- -k, --vmlinux: Set path to vmlinux file.
- -v, --verbose: Enable debugging log, after enable this option the
script dumps every event data.+Below is one example for using python script to dump CoreSight trace +disassembler:
- $ perf script -s arm-cs-trace-disasm.py -i perf.data \
-F cpu,event,ip,addr,sym -- -d objdump -k ./vmlinux > cs-disasm.log+Below is one example for the disassembler log:
+ARM CoreSight Trace Data Assembler Dump
- ffff000008a5f2dc <etm4_enable_hw+0x344>:
- ffff000008a5f2dc: 340000a0 cbz w0, ffff000008a5f2f0 <etm4_enable_hw+0x358>
- ffff000008a5f2f0 <etm4_enable_hw+0x358>:
- ffff000008a5f2f0: f9400260 ldr x0, [x19]
- ffff000008a5f2f4: d5033f9f dsb sy
- ffff000008a5f2f8: 913ec000 add x0, x0, #0xfb0
- ffff000008a5f2fc: b900001f str wzr, [x0]
- ffff000008a5f300: f9400bf3 ldr x19, [sp, #16]
- ffff000008a5f304: a8c27bfd ldp x29, x30, [sp], #32
- ffff000008a5f308: d65f03c0 ret
- ffff000008a5fa18 <etm4_enable+0x1b0>:
- ffff000008a5fa18: 14000025 b ffff000008a5faac <etm4_enable+0x244>
- ffff000008a5faac <etm4_enable+0x244>:
- ffff000008a5faac: b9406261 ldr w1, [x19, #96]
- ffff000008a5fab0: 52800015 mov w21, #0x0 // #0
- ffff000008a5fab4: f901ca61 str x1, [x19, #912]
- ffff000008a5fab8: 2a1503e0 mov w0, w21
- ffff000008a5fabc: 3940e261 ldrb w1, [x19, #56]
- ffff000008a5fac0: f901ce61 str x1, [x19, #920]
- ffff000008a5fac4: a94153f3 ldp x19, x20, [sp, #16]
- ffff000008a5fac8: a9425bf5 ldp x21, x22, [sp, #32]
- ffff000008a5facc: a94363f7 ldp x23, x24, [sp, #48]
- ffff000008a5fad0: a8c47bfd ldp x29, x30, [sp], #64
- ffff000008a5fad4: d65f03c0 ret
-- 2.7.4