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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>
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3 changed files with 22 additions and 0 deletions
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@ -64,4 +64,19 @@ bool arch__prefers_symtab(void)
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{
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return true;
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}
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#define PPC64LE_LEP_OFFSET 8
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void arch__fix_tev_from_maps(struct perf_probe_event *pev,
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struct probe_trace_event *tev, struct map *map)
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{
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/*
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* ppc64 ABIv2 local entry point is currently always 2 instructions
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* (8 bytes) after the global entry point.
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*/
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if (!pev->uprobes && map->dso->symtab_type == DSO_BINARY_TYPE__KALLSYMS) {
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tev->point.address += PPC64LE_LEP_OFFSET;
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tev->point.offset += PPC64LE_LEP_OFFSET;
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}
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}
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#endif
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@ -2447,6 +2447,10 @@ static int find_probe_functions(struct map *map, char *name)
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#define strdup_or_goto(str, label) \
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({ char *__p = strdup(str); if (!__p) goto label; __p; })
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void __weak arch__fix_tev_from_maps(struct perf_probe_event *pev __maybe_unused,
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struct probe_trace_event *tev __maybe_unused,
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struct map *map __maybe_unused) { }
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/*
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* Find probe function addresses from map.
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* Return an error or the number of found probe_trace_event
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@ -2553,6 +2557,7 @@ static int find_probe_trace_events_from_map(struct perf_probe_event *pev,
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strdup_or_goto(pev->args[i].type,
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nomem_out);
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}
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arch__fix_tev_from_maps(pev, tev, map);
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}
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out:
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@ -136,6 +136,8 @@ extern int show_available_vars(struct perf_probe_event *pevs, int npevs,
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extern int show_available_funcs(const char *module, struct strfilter *filter,
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bool user);
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bool arch__prefers_symtab(void);
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void arch__fix_tev_from_maps(struct perf_probe_event *pev,
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struct probe_trace_event *tev, struct map *map);
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/* Maximum index number of event-name postfix */
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#define MAX_EVENT_INDEX 1024
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