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Subject[PATCH v2 2/4] perf tools: Use dynamic register set for Dwarf unwind
Date
Architectures can detect availability of extra registers at
runtime so use this more complete set for unwinding. This
will include the VG register on arm64 in a later commit.

If the function isn't implemented then PERF_REGS_MASK is
returned and there is no change.

Signed-off-by: James Clark <james.clark@arm.com>
---
tools/perf/util/evsel.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c
index 5fd7924f8eb3..787bbcbcd2ae 100644
--- a/tools/perf/util/evsel.c
+++ b/tools/perf/util/evsel.c
@@ -896,7 +896,7 @@ static void __evsel__config_callchain(struct evsel *evsel, struct record_opts *o
"specifying a subset with --user-regs may render DWARF unwinding unreliable, "
"so the minimal registers set (IP, SP) is explicitly forced.\n");
} else {
- attr->sample_regs_user |= PERF_REGS_MASK;
+ attr->sample_regs_user |= arch__user_reg_mask();
}
attr->sample_stack_user = param->dump_size;
attr->exclude_callchain_user = 1;
--
2.28.0
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