diff options
| author | Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com> | 2016-04-12 11:10:50 +0200 |
|---|---|---|
| committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2016-05-06 02:04:03 +0200 |
| commit | 0b3c2264ae30ed692fd1ffd2b84c5fbdf737cb0d (patch) | |
| tree | f26cae86be020c92c2a78880da9af369427f3456 /tools/perf/util/symbol.h | |
| parent | perf powerpc: Fix kprobe and kretprobe handling with kallsyms on ppc64le (diff) | |
| download | linux-0b3c2264ae30ed692fd1ffd2b84c5fbdf737cb0d.tar.xz linux-0b3c2264ae30ed692fd1ffd2b84c5fbdf737cb0d.zip | |
perf symbols: Fix kallsyms perf test on ppc64le
ppc64le functions have a Global Entry Point (GEP) and a Local Entry
Point (LEP). While placing a probe, we always prefer the LEP since it
catches function calls through both the GEP and the LEP. In order to do
this, we fixup the function entry points during elf symbol table lookup
to point to the LEPs. This works, but breaks 'perf test kallsyms' since
the symbols loaded from the symbol table (pointing to the LEP) do not
match the symbols in kallsyms.
To fix this, we do not adjust all the symbols during symbol table load.
Instead, we note down st_other in a newly introduced arch-specific
member of perf symbol structure, and later use this to adjust the probe
trace point.
Reported-by: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>
Acked-by: Ananth N Mavinakayanahalli <ananth@in.ibm.com>
Acked-by: Balbir Singh <bsingharora@gmail.com>
Cc: Mark Wielaard <mjw@redhat.com>
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Thiago Jung Bauermann <bauerman@linux.vnet.ibm.com>
Cc: linuxppc-dev@lists.ozlabs.org
Link: http://lkml.kernel.org/r/6be7c2b17e370100c2f79dd444509df7929bdd3e.1460451721.git.naveen.n.rao@linux.vnet.ibm.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools/perf/util/symbol.h')
| -rw-r--r-- | tools/perf/util/symbol.h | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/tools/perf/util/symbol.h b/tools/perf/util/symbol.h index c8e43979ed5c..07211c2f8456 100644 --- a/tools/perf/util/symbol.h +++ b/tools/perf/util/symbol.h @@ -55,6 +55,7 @@ struct symbol { u16 namelen; u8 binding; bool ignore; + u8 arch_sym; char name[0]; }; @@ -323,7 +324,7 @@ int setup_intlist(struct intlist **list, const char *list_str, #ifdef HAVE_LIBELF_SUPPORT bool elf__needs_adjust_symbols(GElf_Ehdr ehdr); -void arch__elf_sym_adjust(GElf_Sym *sym); +void arch__sym_update(struct symbol *s, GElf_Sym *sym); #endif #define SYMBOL_A 0 |