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perf probe ppc64le: Fixup function entry if using kallsyms lookup

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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>
This commit is contained in:
Naveen N. Rao 2015-04-28 17:35:40 +05:30 committed by Arnaldo Carvalho de Melo
parent d5c2e2c17a
commit 7b6ff0bdbf
3 changed files with 22 additions and 0 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

15
tools/perf/arch/powerpc/util/sym-handling.c
View file

@ -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

5
tools/perf/util/probe-event.c
View file

@ -2447,6 +2447,10 @@ static int find_probe_functions(struct map *map, char *name)
#define strdup_or_goto(str, label) \
({ char *__p = strdup(str); if (!__p) goto label; __p; })
void __weak arch__fix_tev_from_maps(struct perf_probe_event *pev __maybe_unused,
struct probe_trace_event *tev __maybe_unused,
struct map *map __maybe_unused) { }
/*
* Find probe function addresses from map.
* Return an error or the number of found probe_trace_event
@ -2553,6 +2557,7 @@ static int find_probe_trace_events_from_map(struct perf_probe_event *pev,
strdup_or_goto(pev->args[i].type,
nomem_out);
}
arch__fix_tev_from_maps(pev, tev, map);
}
out:

2
tools/perf/util/probe-event.h
View file

@ -136,6 +136,8 @@ extern int show_available_vars(struct perf_probe_event *pevs, int npevs,
extern int show_available_funcs(const char *module, struct strfilter *filter,
bool user);
bool arch__prefers_symtab(void);
void arch__fix_tev_from_maps(struct perf_probe_event *pev,
struct probe_trace_event *tev, struct map *map);
/* Maximum index number of event-name postfix */
#define MAX_EVENT_INDEX 1024