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[PULL,v3,28/44] disas: nanoMIPS: Comment the decoder of 'gpr3.src.store' gpr encoding type

Message ID 1546535297-11040-29-git-send-email-aleksandar.markovic@rt-rk.com (mailing list archive)
State New, archived
Headers show
Series [PULL,v3,01/44] MAINTAINERS: target/mips: Add MIPS files under default-configs directory | expand

Commit Message

Aleksandar Markovic Jan. 3, 2019, 5:08 p.m. UTC 
From: Aleksandar Markovic <amarkovic@wavecomp.com>

Comment the decoder of 'gpr3.src.store' gpr encoding type in nanoMIPS
disassembler.

Reviewed-by: Aleksandar Rikalo <arikalo@wavecomp.com>
Signed-off-by: Aleksandar Markovic <amarkovic@wavecomp.com>
---
 disas/nanomips.cpp | 32 ++++++++++++++++++++++++++++++++
 1 file changed, 32 insertions(+)
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Patch

diff --git a/disas/nanomips.cpp b/disas/nanomips.cpp
index 7c56162..1c313f3 100644
--- a/disas/nanomips.cpp
+++ b/disas/nanomips.cpp
@@ -349,6 +349,38 @@  uint64 NMD::decode_gpr_gpr3(uint64 d)
 }
 
 
+/*
+ * NMD::decode_gpr_gpr3_src_store() - decoder for 'gpr3.src.store' gpr encoding
+ *     type
+ *
+ *   Map a 3-bit code to the 5-bit register space according to this pattern:
+ *
+ *                            7 6 5 4 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
+ *
+ *   This pattern is the same one used for 'gpr3' gpr encoding type, except for
+ * the input value 0, that is mapped to the output value 0 instead of 16.
+ *
+ *   Used in handling following instructions:
+ *
+ *     - SB[16]
+ *     - SH[16]
+ *     - SW[16]
+ *     - SW[GP16]
+ */
 uint64 NMD::decode_gpr_gpr3_src_store(uint64 d)
 {
     static uint64 register_list[] = {  0, 17, 18, 19,  4,  5,  6,  7 };