From a21e052013bf0d9ff3736b694cf0210b4b173353 Mon Sep 17 00:00:00 2001 From: Aleksandar Markovic Date: Wed, 26 Dec 2018 14:42:13 +0100 Subject: disas: nanoMIPS: Comment the decoder of 'gpr2.reg2' gpr encoding type Comment the decoder of 'gpr2.reg2' gpr encoding type in nanoMIPS disassembler. Reviewed-by: Aleksandar Rikalo Signed-off-by: Aleksandar Markovic --- disas/nanomips.cpp | 22 ++++++++++++++++++++++ 1 file changed, 22 insertions(+) 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 }; -- cgit v1.2.3