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-rw-r--r--disas/nanomips.cpp22
1 files changed, 22 insertions, 0 deletions
diff --git a/disas/nanomips.cpp b/disas/nanomips.cpp
index 06d2400284..fe0c4af4cc 100644
--- a/disas/nanomips.cpp
+++ b/disas/nanomips.cpp
@@ -498,6 +498,28 @@ uint64 NMD::decode_gpr_gpr2_reg1(uint64 d)
}
+/*
+ * NMD::decode_gpr_gpr2_reg2() - decoder for 'gpr2.reg2' gpr encoding type
+ *
+ * Map a 2-bit code to the 5-bit register space according to this pattern:
+ *
+ * 3 2 1 0
+ * | | | |
+ * | | | |
+ * | | | └-----------------┐
+ * | | └-----------------┐ |
+ * | └-----------------┐ | |
+ * └-----------------┐ | | |
+ * | | | |
+ * | | | |
+ * 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0
+ * 3 2 1 0
+ *
+ * Used in handling following instructions:
+ *
+ * - MOVEP
+ * - MOVEP[REV]
+ */
uint64 NMD::decode_gpr_gpr2_reg2(uint64 d)
{
static uint64 register_list[] = { 5, 6, 7, 8 };