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[v6,24/26] disas: nanoMIPS: Comment the decoder of 'gpr1' gpr encoding type

Message ID 1545920586-17815-25-git-send-email-aleksandar.markovic@rt-rk.com
State New
Headers show
Series disas: nanoMIPS: Clean up several issues | expand

Commit Message

Aleksandar Markovic Dec. 27, 2018, 2:23 p.m. UTC 
From: Aleksandar Markovic <amarkovic@wavecomp.com>

Comment the decoder of 'gpr1' gpr encoding type in nanoMIPS
disassembler.

Signed-off-by: Aleksandar Markovic <amarkovic@wavecomp.com>
---
 disas/nanomips.cpp | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)
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Patch

diff --git a/disas/nanomips.cpp b/disas/nanomips.cpp
index ec223e8..e55361c 100644
--- a/disas/nanomips.cpp
+++ b/disas/nanomips.cpp
@@ -388,6 +388,27 @@  uint64 NMD::decode_gpr_gpr3_src_store(uint64 d)
 }
 
 
+/*
+ * NMD::decode_gpr_gpr1() - decoder for 'gpr1' gpr encoding type
+ *
+ *   Map a 1-bit code to the 5-bit register space according to this pattern:
+ *
+ *                                  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 instruction:
+ *
+ *     - MOVE.BALC
+ */
 uint64 NMD::decode_gpr_gpr1(uint64 d)
 {
     static uint64 register_list[] = {  4,  5 };