On Fri, 14 Jan 2022 03:28:37 +0000 "Chen, Hongzhan" <hongzhan.chen@xxxxxxxxx> wrote: > >> Following is two dumps, please check: > >> > >> smokey-447 [000] 320.193156: cobalt_pthread_create: 74 02 00 00 bf 01 00 00 40 37 4b aa ab 7f 00 00 00 00 00 00 18 00 38 00 00 00 00 00 fe 7f 00 00 60 c3 24 90 ff ff ff ff 5c 81 21 90 ff ff ff ff d8 bd 8c 80 90 c1 ff ff 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 > > > >common_type: 0x0274 = 628 (matches the ID) > >common_flags: 00 > >common_preempt_count: 00 > >common_pid: 0x000001bf : 447 > > > >pth: 0x00007fabaa4b3f40 (whatever that is) > >policy: 0x00000000 > >param_ex: 0x00180038 (offset = 0x38 (56) len=0x18 (24) > > Thanks for your quick reply. 😊 > > On my X86 platform , it is printed as 0x380018(offset should be 0x18 > len = 0x38). It should point to the end of field param_ex How did you get that? The above shows the 4 bytes are: field:__data_loc char[] param_ex; offset:20; size:4; signed:1; And if you take the 4 bytes at offset 20 from above we get: 18 00 38 00 And since this is little endian, that turns into: 0x00380018 > (field:__data_loc char[] param_ex; offset:20; size:4; > signed:1) where store its data per my understanding. Please correct > me if I am wrong. > > > > > >Hmm, the offset points to that set of zeros at the end. > > > >How was this event created? > > The event definition please refer to https://gitlab.com/Xenomai/xenomai-hacker-space/-/blob/master/kernel/cobalt/trace/cobalt-posix.h > That references other files. Are those other files taken from the Linux kernel? Specifically: #include <linux/tracepoint.h> #include <linux/trace_seq.h> #include <trace/define_trace.h> -- Steve
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