perf probe ppc64le: Fix ppc64 ABIv2 symbol decoding
ppc64 ELF ABIv2 has a Global Entry Point (GEP) and a Local Entry Point (LEP). For purposes of probing, we need the LEP - the offset to which is encoded in st_other. Signed-off-by: Ananth N Mavinakayanahalli <ananth@in.ibm.com> Reviewed-by: Srikar Dronamraju <srikar@linux.vnet.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/ab9cc5e2b9de4cbaaf50f6ef2346a6a81100bad1.1430217967.git.naveen.n.rao@linux.vnet.ibm.com Signed-off-by: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com> Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
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@ -17,6 +17,13 @@ bool elf__needs_adjust_symbols(GElf_Ehdr ehdr)
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ehdr.e_type == ET_REL ||
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ehdr.e_type == ET_DYN;
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}
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#if defined(_CALL_ELF) && _CALL_ELF == 2
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void arch__elf_sym_adjust(GElf_Sym *sym)
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{
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sym->st_value += PPC64_LOCAL_ENTRY_OFFSET(sym->st_other);
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}
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#endif
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#endif
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#if !defined(_CALL_ELF) || _CALL_ELF != 2
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@ -775,6 +775,8 @@ static bool want_demangle(bool is_kernel_sym)
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return is_kernel_sym ? symbol_conf.demangle_kernel : symbol_conf.demangle;
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}
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void __weak arch__elf_sym_adjust(GElf_Sym *sym __maybe_unused) { }
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int dso__load_sym(struct dso *dso, struct map *map,
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struct symsrc *syms_ss, struct symsrc *runtime_ss,
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symbol_filter_t filter, int kmodule)
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@ -939,6 +941,8 @@ int dso__load_sym(struct dso *dso, struct map *map,
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(sym.st_value & 1))
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--sym.st_value;
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arch__elf_sym_adjust(&sym);
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if (dso->kernel || kmodule) {
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char dso_name[PATH_MAX];
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@ -305,6 +305,7 @@ int setup_intlist(struct intlist **list, const char *list_str,
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#ifdef HAVE_LIBELF_SUPPORT
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bool elf__needs_adjust_symbols(GElf_Ehdr ehdr);
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void arch__elf_sym_adjust(GElf_Sym *sym);
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#endif
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#define SYMBOL_A 0
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