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disas: nanoMIPS: Comment the decoder of 'gpr1' gpr encoding type

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Comment the decoder of 'gpr1' 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 2018-12-26 18:41:23 +01:00
parent 68d80fd58f
commit dffcf177dc
1 changed files with 21 additions and 0 deletions
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21
disas/nanomips.cpp
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@ -389,6 +389,27 @@ 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 };