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perf probe ppc: Use the right prefix when ignoring SyS symbols on ppc

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Use the proper prefix when ignoring SyS symbols on ppc ABIv1. While at
it, generalize symbol selection so architectures can implement their own
logic.

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/adf1f98b121ecaf292777fe5cc69fe1038feabce.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 17:35:36 +05:30 committed by Arnaldo Carvalho de Melo
parent d233209833
commit fb6d594231
3 changed files with 37 additions and 9 deletions
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20
tools/perf/arch/powerpc/util/sym-handling.c
View file

@ -17,3 +17,23 @@ bool elf__needs_adjust_symbols(GElf_Ehdr ehdr)
ehdr.e_type == ET_DYN;
}
#endif
#if !defined(_CALL_ELF) || _CALL_ELF != 2
int arch__choose_best_symbol(struct symbol *syma,
struct symbol *symb __maybe_unused)
{
char *sym = syma->name;
/* Skip over any initial dot */
if (*sym == '.')
sym++;
/* Avoid "SyS" kernel syscall aliases */
if (strlen(sym) >= 3 && !strncmp(sym, "SyS", 3))
return SYMBOL_B;
if (strlen(sym) >= 10 && !strncmp(sym, "compat_SyS", 10))
return SYMBOL_B;
return SYMBOL_A;
}
#endif

21
tools/perf/util/symbol.c
View file

@ -85,8 +85,17 @@ static int prefix_underscores_count(const char *str)
return tail - str;
}
#define SYMBOL_A 0
#define SYMBOL_B 1
int __weak arch__choose_best_symbol(struct symbol *syma,
struct symbol *symb __maybe_unused)
{
/* Avoid "SyS" kernel syscall aliases */
if (strlen(syma->name) >= 3 && !strncmp(syma->name, "SyS", 3))
return SYMBOL_B;
if (strlen(syma->name) >= 10 && !strncmp(syma->name, "compat_SyS", 10))
return SYMBOL_B;
return SYMBOL_A;
}
static int choose_best_symbol(struct symbol *syma, struct symbol *symb)
{
@ -134,13 +143,7 @@ static int choose_best_symbol(struct symbol *syma, struct symbol *symb)
else if (na < nb)
return SYMBOL_B;
/* Avoid "SyS" kernel syscall aliases */
if (na >= 3 && !strncmp(syma->name, "SyS", 3))
return SYMBOL_B;
if (na >= 10 && !strncmp(syma->name, "compat_SyS", 10))
return SYMBOL_B;
return SYMBOL_A;
return arch__choose_best_symbol(syma, symb);
}
void symbols__fixup_duplicate(struct rb_root *symbols)

5
tools/perf/util/symbol.h
View file

@ -307,4 +307,9 @@ int setup_intlist(struct intlist **list, const char *list_str,
bool elf__needs_adjust_symbols(GElf_Ehdr ehdr);
#endif
#define SYMBOL_A 0
#define SYMBOL_B 1
int arch__choose_best_symbol(struct symbol *syma, struct symbol *symb);
#endif /* __PERF_SYMBOL */