[RFC PATCH v2 04/15] perf tools: Add functions to get calling regs

[He Kuang <hekuang@huawei.com>]

For generating function formal parameters without debuginfo, add
function to get names and offsets of architecture dependent calling
regs.

Signed-off-by: He Kuang <hekuang@huawei.com>
---
 tools/perf/util/include/dwarf-regs.h |  2 ++
 tools/perf/util/probe-finder.c       | 10 ++++++++++
 2 files changed, 12 insertions(+)

diff --git a/tools/perf/util/include/dwarf-regs.h b/tools/perf/util/include/dwarf-regs.h
index 566ff6d..dc02243 100644
--- a/tools/perf/util/include/dwarf-regs.h
+++ b/tools/perf/util/include/dwarf-regs.h
@@ -16,6 +16,8 @@ struct arch_regs_info {
 const char *get_arch_regstr(unsigned int n);
 int get_arch_reg_offset(unsigned int n);
 int get_arch_reg_size(unsigned int n);
+const char *get_arch_calling_reg_str(unsigned int n);
+int get_arch_calling_reg_offset(unsigned int n);
 #endif
 
 #endif
diff --git a/tools/perf/util/probe-finder.c b/tools/perf/util/probe-finder.c
index 681af00..4de7649 100644
--- a/tools/perf/util/probe-finder.c
+++ b/tools/perf/util/probe-finder.c
@@ -169,6 +169,16 @@ get_arch_reg_size(unsigned int n __maybe_unused) {
 	return -1;
 }
 
+const char __attribute__ ((weak))
+*get_arch_calling_reg_str(unsigned int n __maybe_unused) {
+	return NULL;
+}
+
+int __attribute__ ((weak))
+get_arch_calling_reg_offset(unsigned int n __maybe_unused) {
+	return -1;
+}
+
 /*
  * Convert a location into trace_arg.
  * If tvar == NULL, this just checks variable can be converted.
-- 
1.8.5.2