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

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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>
This commit is contained in:
Aleksandar Markovic 2018-12-25 15:18:18 +01:00
parent 8191856b57
commit 6ab8abfcde
1 changed files with 32 additions and 0 deletions
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32
disas/nanomips.cpp
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@ -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 };