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| author | Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com> | 2015-04-28 14:05:40 +0200 |
|---|---|---|
| committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2015-05-04 17:43:47 +0200 |
| commit | 7b6ff0bdbf4f7f429c2116cca92a6d171217449e (patch) | |
| tree | 8613de51de238f1ac3817c672bbafcee7cd55b5f /tools/perf/arch/powerpc/util | |
| parent | perf probe ppc64le: Prefer symbol table lookup over DWARF (diff) | |
| download | linux-7b6ff0bdbf4f7f429c2116cca92a6d171217449e.tar.xz linux-7b6ff0bdbf4f7f429c2116cca92a6d171217449e.zip | |
perf probe ppc64le: Fixup function entry if using kallsyms lookup
On powerpc ABIv2, if no debug-info is found and we use kallsyms, we need
to fixup the function entry to point to the local entry point. Use
offset of 8 since current toolchains always generate 2 instructions (8
bytes).
Signed-off-by: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>
Reviewed-by: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Cc: Ananth N Mavinakayanahalli <ananth@in.ibm.com>
Cc: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com>
Cc: linuxppc-dev@lists.ozlabs.org
Link: http://lkml.kernel.org/r/92253021e77a104b23b615c8c23bf9501dfe60bf.1430217967.git.naveen.n.rao@linux.vnet.ibm.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools/perf/arch/powerpc/util')
| -rw-r--r-- | tools/perf/arch/powerpc/util/sym-handling.c | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/tools/perf/arch/powerpc/util/sym-handling.c b/tools/perf/arch/powerpc/util/sym-handling.c index a1700609e145..bbc1a50768dd 100644 --- a/tools/perf/arch/powerpc/util/sym-handling.c +++ b/tools/perf/arch/powerpc/util/sym-handling.c @@ -64,4 +64,19 @@ bool arch__prefers_symtab(void) { return true; } + +#define PPC64LE_LEP_OFFSET 8 + +void arch__fix_tev_from_maps(struct perf_probe_event *pev, + struct probe_trace_event *tev, struct map *map) +{ + /* + * ppc64 ABIv2 local entry point is currently always 2 instructions + * (8 bytes) after the global entry point. + */ + if (!pev->uprobes && map->dso->symtab_type == DSO_BINARY_TYPE__KALLSYMS) { + tev->point.address += PPC64LE_LEP_OFFSET; + tev->point.offset += PPC64LE_LEP_OFFSET; + } +} #endif |