Thank you for your answers. I fixed the issue by applying the patches in the pull-request. I'm not getting any segfaults.. but i have a different issue now. I'm recording my own program, super simple(int main() { printf("Sleep\n"); return 0; }). The recording seems to work:
$ sudo perf record -e cs_etm/@826000.etr/u --per-thread ./check
Sleep [ perf record: Woken up 1 times to write data ] [ perf record: Captured and wrote 0.003 MB perf.data ]
But when i try to run the perf script, i'm not getting any trace events, even though i can see there are trace packets(using perf report --dump):
$ /home/mike/repo/trace/linux/tools/perf/perf
--exec-path=/home/mike/repo/trace/linux/tools/perf script --script=python:/home/mike/repo/trace/linux/tools/perf/scripts/python/cs-trace-disasm.py -- -d /usr/bin/aarch64-linux-gnu-objdump /lib/aarch64-linux-gnu/ld-2.26.so with build id 6516ef8fa13fcb739834af9e87fb5fe9df612096 not found, continuing without symbols /lib/aarch64-linux-gnu/libc-2.26.so with build id 06e99d8d6acabab0643e0f525ac561cf73db6498 not found, continuing without symbols /home/linaro/check with build id 31694f29996e06da12f63d6088ec6eb23b3079c4 not found, continuing without symbols /lib/aarch64-linux-gnu/ld-2.26.so with build id 6516ef8fa13fcb739834af9e87fb5fe9df612096 not found, continuing without symbols /lib/aarch64-linux-gnu/libc-2.26.so with build id 06e99d8d6acabab0643e0f525ac561cf73db6498 not found, continuing without symbols /home/linaro/check with build id 31694f29996e06da12f63d6088ec6eb23b3079c4 not found, continuing without symbols
The output gives nothing but the "not found, continuing without symbols". I have dived into the code a little bit, and i can see that the only packet types that i get are* CS_ETM_TRACE_ON.* This switch case(cs-etm.c line 1010): 1009 switch (etmq->packet->sample_type) {
1010 case CS_ETM_RANGE:
1011 /*
1012 * If the packet contains an instruction 1013 * range, generate instruction sequence 1014 * events.
1015 */
1016 cs_etm__sample(etmq);
1017 break;
1018 case CS_ETM_TRACE_ON:
1019 /*
1020 * Discontinuity in trace, flush 1021 * previous branch stack
1022 */
1023 cs_etm__flush(etmq);
1024 break;
1025 default:
1026 break;
1027 }
Never! gets to CS_ETM_RANGE.. therefore i get no decoded instructions. perf report does show packets:
Idx:0; ID:16; I_ASYNC : Alignment Synchronisation. Idx:12; ID:16; I_TRACE_INFO : Trace Info.; INFO=0x1;CC_THRESHOLD=0x100 Idx:19; ID:16; I_ADDR_L_64IS0 : Address, Long, 64 bit, IS0.; Addr=0x0000000000000000; Idx:28; ID:16; I_TRACE_ON : Trace On. Idx:29; ID:16; I_ADDR_CTXT_L_64IS0 : Address & Context, Long, 64 bit, IS0.; Addr=0x0000FFFF9D3> Idx:40; ID:16; I_ATOM_F1 : Atom format 1.; E Idx:41; ID:16; I_CCNT_F1 : Cycle Count format 1.; Count=0x0 Idx:42; ID:16; I_TIMESTAMP : Timestamp.; Updated val = 0x70fcdee7; CC=0x1 Idx:54; ID:16; I_ATOM_F1 : Atom format 1.; E Idx:55; ID:16; I_CCNT_F1 : Cycle Count format 1.; Count=0x1d4 Idx:58; ID:16; I_ATOM_F6 : Atom format 6.; EEEEEEEEEEEEEEEEEEEEEEEE Idx:59; ID:16; I_ATOM_F6 : Atom format 6.; EEEEEEEEEEEEEEEEEEEEEEEE Idx:60; ID:16; I_ATOM_F6 : Atom format 6.; EEEEEEEEEEEEEEEEEEEEEEEE Idx:61; ID:16; I_ATOM_F3 : Atom format 3.; EEN Idx:62; ID:16; I_ATOM_F1 : Atom format 1.; E Idx:64; ID:16; I_EXCEPT : Exception.; Data Fault; Ret Addr Follows, Match Prev; Idx:66; ID:16; I_ADDR_L_64IS0 : Address, Long, 64 bit, IS0.; Addr=0x0000FFFF9D378770; Idx:75; ID:16; I_ADDR_CTXT_L_64IS0 : Address & Context, Long, 64 bit, IS0.; Addr=0xFFFF7DFFFE7> Idx:86; ID:16; I_TIMESTAMP : Timestamp.; Updated val = 0x70fcdf71; CC=0xf6 Idx:91; ID:16; I_TRACE_ON : Trace On. Idx:92; ID:16; I_ADDR_CTXT_L_64IS0 : Address & Context, Long, 64 bit, IS0.; Addr=0x0000FFFF9D3> Idx:103; ID:16; I_ATOM_F1 : Atom format 1.; N Idx:104; ID:16; I_CCNT_F1 : Cycle Count format 1.; Count=0x0 Idx:105; ID:16; I_ATOM_F6 : Atom format 6.; EEEEN Idx:106; ID:16; I_ATOM_F2 : Atom format 2.; EE ... ... ... ... ... ...
This is my .debug tree:
|-- [kernel.kallsyms] | `-- 1dc43d23817467d7717b19af07463af0d9a9bd83 | `-- kallsyms |-- [vdso] | `-- 18863444e4f3e2600f53e406421b2a0edd940888 | `-- vdso |-- bin | `-- check | `-- 31694f29996e06da12f63d6088ec6eb23b3079c4 | `-- elf `-- lib `-- aarch64-linux-gnu |-- ld-2.26.so | `-- 6516ef8fa13fcb739834af9e87fb5fe9df612096 | `-- elf `-- libc.so.6 `-- 06e99d8d6acabab0643e0f525ac561cf73db6498 `-- elf
This seems fine according to the HOWTO.md. The weird part is, that if i record "uname" and not my program, i do get trace events.
Any suggestions? Thanks, Mike.