[Bug tapsets/9876] New: Syscall tapset broken on architectures that use SYSCALL_WRAPPERS

["ananth at in dot ibm dot com" <sourceware-bugzilla@sourceware.org>]

Recently, the upstream kernel acquired the SYSCALL_WRAPPER code that is now
being used by multiple architectures including ARM, SPARC, POWERPC and s390.
With that change the current syscall tapsets are broken.

The change necessarily creates the an asmlinkage SyS_* routines that encapsulate
the sys_* routines that are inlined. With the change, even simple scripts as fail:

[ananth@... ~]$ stap -ve 'probe syscall.access {print("here\n") exit() }'
Pass 1: parsed user script and 47 library script(s) in 450usr/0sys/509real ms.
semantic error: no match while resolving probe point kernel.function("sys_access")
semantic error: no match while resolving probe point syscall.access
semantic error: no probes found
Pass 2: analyzed script: 0 probe(s), 0 function(s), 0 embed(s), 0 global(s) in
520usr/880sys/1633real ms.
Pass 2: analysis failed.  Try again with another '--vp 01' option.
[ananth@... ~]$ stap -ve 'probe kernel.function("sys_access") {print("here\n")
exit() }'
Pass 1: parsed user script and 47 library script(s) in 450usr/0sys/509real ms.
semantic error: no match while resolving probe point kernel.function("sys_access")
semantic error: no probes found
Pass 2: analyzed script: 0 probe(s), 0 function(s), 0 embed(s), 0 global(s) in
520usr/880sys/1663real ms.
Pass 2: analysis failed.  Try again with another '--vp 01' option.

While probing the wrapper works:
[ananth@... ~]$ 'stap -ve 'probe kernel.function("SyS_access") {print("here\n")
exit() }'
Pass 1: parsed user script and 47 library script(s) in 450usr/10sys/511real ms.
Pass 2: analyzed script: 1 probe(s), 2 function(s), 0 embed(s), 0 global(s) in
510usr/860sys/1616real ms.
Pass 3: translated to C into
"/tmp/stapnRd0lO/stap_2b2ebb56d31314a25fff4a30d7eda8c2_527.c" in
870usr/1310sys/2499real ms.
Pass 4: compiled C into "stap_2b2ebb56d31314a25fff4a30d7eda8c2_527.ko" in
6640usr/610sys/10331real ms.
Pass 5: starting run.

-- 
           Summary: Syscall tapset broken on architectures that use
                    SYSCALL_WRAPPERS
           Product: systemtap
           Version: unspecified
            Status: NEW
          Severity: critical
          Priority: P2
         Component: tapsets
        AssignedTo: systemtap at sources dot redhat dot com
        ReportedBy: ananth at in dot ibm dot com


http://sourceware.org/bugzilla/show_bug.cgi?id=9876

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