[PATCH 3/3] tools/perf/arch/powerc: Add get_arch_regnum for powerpc

[Athira Rajeev <atrajeev@linux.vnet.ibm.com>]

The function get_dwarf_regnum() returns a DWARF register number
from a register name string. This calls arch specific function
get_arch_regnum to return register number for corresponding arch.
Add mappings for register name to register number in powerpc code:
arch/powerpc/util/dwarf-regs.c

Signed-off-by: Athira Rajeev <atrajeev@linux.vnet.ibm.com>
---
 tools/perf/arch/powerpc/util/dwarf-regs.c | 29 +++++++++++++++++++++++
 1 file changed, 29 insertions(+)

diff --git a/tools/perf/arch/powerpc/util/dwarf-regs.c b/tools/perf/arch/powerpc/util/dwarf-regs.c
index 0c4f4caf53ac..d955e3e577ea 100644
--- a/tools/perf/arch/powerpc/util/dwarf-regs.c
+++ b/tools/perf/arch/powerpc/util/dwarf-regs.c
@@ -98,3 +98,32 @@ int regs_query_register_offset(const char *name)
 			return roff->ptregs_offset;
 	return -EINVAL;
 }
+
+struct dwarf_regs_idx {
+	const char *name;
+	int idx;
+};
+
+static const struct dwarf_regs_idx powerpc_regidx_table[] = {
+	{ "r0", 0 }, { "r1", 1 }, { "r2", 2 }, { "r3", 3 }, { "r4", 4 },
+	{ "r5", 5 }, { "r6", 6 }, { "r7", 7 }, { "r8", 8 }, { "r9", 9 },
+	{ "r10", 10 }, { "r11", 11 }, { "r12", 12 }, { "r13", 13 }, { "r14", 14 },
+	{ "r15", 15 }, { "r16", 16 }, { "r17", 17 }, { "r18", 18 }, { "r19", 19 },
+	{ "r20", 20 }, { "r21", 21 }, { "r22", 22 }, { "r23", 23 }, { "r24", 24 },
+	{ "r25", 25 }, { "r26", 26 }, { "r27", 27 }, { "r27", 27 }, { "r28", 28 },
+	{ "r29", 29 }, { "r30", 30 }, { "r31", 31 },
+};
+
+int get_arch_regnum(const char *name)
+{
+	unsigned int i;
+
+	if (*name != 'r')
+		return -EINVAL;
+
+	for (i = 0; i < ARRAY_SIZE(powerpc_regidx_table); i++)
+		if (!strcmp(powerpc_regidx_table[i].name, name))
+			return powerpc_regidx_table[i].idx;
+
+	return -ENOENT;
+}
-- 
2.43.0