From: Masami Hiramatsu <mhiramat@kernel.org> To: Arnaldo Carvalho de Melo <acme@kernel.org>, Thomas Richter <tmricht@linux.ibm.com> Cc: linux-perf-users@vger.kernel.org, linux-kernel@vger.kernel.org, Sumanth Korikkar <sumanthk@linux.ibm.com>, Masami Hiramatsu <mhiramat@kernel.org> Subject: [PATCH 1/2] perf-probe: Fix to die_entrypc() returns error correctly Date: Fri, 27 Nov 2020 14:48:46 +0900 Message-ID: <160645612634.2824037.5284932731175079426.stgit@devnote2> (raw) In-Reply-To: <20201126172849.GE53384@kernel.org> Fix die_entrypc() to return error correctly if the DIE has no DW_AT_ranges attribute. Since dwarf_ranges() will treat the case as an empty ranges and return 0, we have to check it by ourselves. Fixes: 91e2f539eeda ("perf probe: Fix to show function entry line as probe-able") Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org> --- tools/perf/util/dwarf-aux.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/tools/perf/util/dwarf-aux.c b/tools/perf/util/dwarf-aux.c index aa898014ad12..03c1a39c312a 100644 --- a/tools/perf/util/dwarf-aux.c +++ b/tools/perf/util/dwarf-aux.c @@ -373,6 +373,7 @@ bool die_is_func_def(Dwarf_Die *dw_die) int die_entrypc(Dwarf_Die *dw_die, Dwarf_Addr *addr) { Dwarf_Addr base, end; + Dwarf_Attribute attr; if (!addr) return -EINVAL; @@ -380,6 +381,13 @@ int die_entrypc(Dwarf_Die *dw_die, Dwarf_Addr *addr) if (dwarf_entrypc(dw_die, addr) == 0) return 0; + /* + * Since the dwarf_ranges() will return 0 if there is no + * DW_AT_ranges attribute, we should check it first. + */ + if (!dwarf_attr(dw_die, DW_AT_ranges, &attr)) + return -ENOENT; + return dwarf_ranges(dw_die, 0, &base, addr, &end) < 0 ? -ENOENT : 0; }
next parent reply index Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top [not found] <20201126172849.GE53384@kernel.org> 2020-11-27 5:48 ` Masami Hiramatsu [this message] 2020-11-27 5:48 ` [PATCH 2/2] perf-probe: Change function definition check due to broken dwarf Masami Hiramatsu 2020-11-27 17:36 ` Arnaldo Carvalho de Melo
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