PPC64 ELF ABIv2 has a Global Entry Point (GEP) and a Local Entry Point
(LEP). For purposes of probing, we need the LEP. Offset to the LEP is
encoded in st_other.
Signed-off-by: Ananth N Mavinakayanahalli <ana...@in.ibm.com>
Signed-off-by: Naveen N. Rao <naveen.n....@linux.vnet.ibm.com>
---
Changes from previous patchset:
Simplified logic by adding dependancy on HAVE_ARCH_SYMBOL_HANDLING. Also
generalized arch_elf_sym_decode() to be suitable for other architectures in
future.
tools/perf/arch/powerpc/util/sym-handling.c | 10 ++++++++++
tools/perf/util/symbol-elf.c | 2 ++
tools/perf/util/symbol.h | 6 ++++++
3 files changed, 18 insertions(+)
diff --git a/tools/perf/arch/powerpc/util/sym-handling.c
b/tools/perf/arch/powerpc/util/sym-handling.c
index 0a77825..a27bfaf 100644
--- a/tools/perf/arch/powerpc/util/sym-handling.c
+++ b/tools/perf/arch/powerpc/util/sym-handling.c
@@ -1,8 +1,10 @@
/*
* Special symbol handling for PowerPC:
* - Handle dot symbols on ABIv1
+ * - Decode offset from Global entry point to Local entry point on ABIv2
*
* Copyright (C) 2014 Naveen N Rao, IBM Corporation.
+ * Copyright (C) 2014 Ananth N Mavinakayanahalli, IBM Corporation.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
@@ -26,3 +28,11 @@ int probe_function_filter(struct map *map __maybe_unused,
struct symbol *sym)
}
return 1;
}
+
+inline void arch_elf_sym_decode(GElf_Sym *sym __maybe_unused)
+{
+#if defined(_CALL_ELF) && _CALL_ELF == 2
+ if (sym && sym->st_other)
+ sym->st_value += PPC64_LOCAL_ENTRY_OFFSET(sym->st_other);
+#endif
+}
diff --git a/tools/perf/util/symbol-elf.c b/tools/perf/util/symbol-elf.c
index 7ac4e4c..557b63b 100644
--- a/tools/perf/util/symbol-elf.c
+++ b/tools/perf/util/symbol-elf.c
@@ -902,6 +902,8 @@ int dso__load_sym(struct dso *dso, struct map *map,
(sym.st_value & 1))
--sym.st_value;
+ arch_elf_sym_decode(&sym);
+
if (dso->kernel || kmodule) {
char dso_name[PATH_MAX];
diff --git a/tools/perf/util/symbol.h b/tools/perf/util/symbol.h
index 9d602e9..9e03cdf 100644
--- a/tools/perf/util/symbol.h
+++ b/tools/perf/util/symbol.h
@@ -294,4 +294,10 @@ int compare_proc_modules(const char *from, const char *to);
int setup_list(struct strlist **list, const char *list_str,
const char *list_name);
+#ifdef HAVE_ARCH_SYMBOL_HANDLING
+extern void arch_elf_sym_decode(GElf_Sym *sym __maybe_unused);
+#else
+static inline void arch_elf_sym_decode(GElf_Sym *sym __maybe_unused) { }
+#endif
+
#endif /* __PERF_SYMBOL */
--
2.1.3
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