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From: "wcohen at redhat dot com" <sourceware-bugzilla@sourceware.org>
To: systemtap@sourceware.org
Subject: [Bug bpf/28285] New: Allow stapbpf backend to handle $arg1, $arg2, ...
Date: Fri, 27 Aug 2021 19:50:18 +0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D28285

            Bug ID: 28285
           Summary: Allow stapbpf backend to handle $arg1, $arg2, ...
           Product: systemtap
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: bpf
          Assignee: systemtap at sourceware dot org
          Reporter: wcohen at redhat dot com
  Target Milestone: ---

The stapbpf backend doesn't handle $argn (for example $arg2 in
gmalloc_watch.stp example below).  A number of the tapsets use $argn to acc=
ess
values passed into functions.  The bpf backend should be able to access tho=
se
simple arguments also, but currently it fails.  This can be demonstrated wi=
th
some of the systemtap examples:

$ sudo dnf install glib2-devel
$ cd /usr/share/systemtap/testsuite/systemtap.examples/
$ sudo stap --bpf apps/gmalloc_watch.stp -T 1
semantic error: unhandled statement or expression type: identifier '$arg2' =
at
/usr/share/systemtap/tapset/x86_64/libglib-2.0.so.0.6800.4.stp:31:13
        source:   n_bytes =3D $arg2;=20
                            ^

Pass 4: compilation failed.  [man error::pass4]
$ sudo stap  --bpf apps/stap_time.stp=20
semantic error: unhandled statement or expression type: identifier '$arg1' =
at
/usr/share/systemtap/tapset/stap_staticmarkers.stp:18:12
        source:         session =3D $arg1
                                  ^

Pass 4: compilation failed.  [man error::pass4]


On the same machine the linux kernel module version things work fine:

$ sudo stap  apps/gmalloc_watch.stp -T 1
g_malloc: pid=3D2077 n_bytes=3D72
$ sudo stap  apps/stap_time.stp -T 1
$

--=20
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