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disas: nanoMIPS: Comment the decoder of 'gpr3' gpr encoding type

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

Reviewed-by: Aleksandar Rikalo <arikalo@wavecomp.com>
Signed-off-by: Aleksandar Markovic <amarkovic@wavecomp.com>
This commit is contained in:
Aleksandar Markovic 2018-12-25 15:06:15 +01:00
parent 988d6c897c
commit 01fc2557ca
1 changed files with 48 additions and 3 deletions
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51
disas/nanomips.cpp
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@ -292,9 +292,54 @@ uint64 NMD::renumber_registers(uint64 index, uint64 *register_list,
/*
* these functions should be decode functions but the json does not have
* decode sections so they are based on the encode, the equivalent decode
* functions need writing eventually.
* NMD::decode_gpr_gpr3() - decoder for 'gpr3' 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
*
* Used in handling following instructions:
*
* - ADDIU[R1.SP]
* - ADDIU[R2]
* - ADDU[16]
* - AND[16]
* - ANDI[16]
* - BEQC[16]
* - BEQZC[16]
* - BNEC[16]
* - BNEZC[16]
* - LB[16]
* - LBU[16]
* - LH[16]
* - LHU[16]
* - LI[16]
* - LW[16]
* - LW[GP16]
* - LWXS[16]
* - NOT[16]
* - OR[16]
* - SB[16]
* - SH[16]
* - SLL[16]
* - SRL[16]
* - SUBU[16]
* - SW[16]
* - XOR[16]
*/
uint64 NMD::decode_gpr_gpr3(uint64 d)
{