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| author | Aleksandar Markovic <amarkovic@wavecomp.com> | 2018-12-25 15:18:18 +0100 |
|---|---|---|
| committer | Aleksandar Markovic <amarkovic@wavecomp.com> | 2019-01-03 17:52:52 +0100 |
| commit | 6ab8abfcde46dba211732ab860be9afba2b54399 (patch) | |
| tree | a7dcc4b934b3a7030eb2f47980ef428f34e93677 /disas | |
| parent | 8191856b5779686c61403e6a9a2c029cc4900876 (diff) | |
| download | qemu-6ab8abfcde46dba211732ab860be9afba2b54399.zip qemu-6ab8abfcde46dba211732ab860be9afba2b54399.tar.gz qemu-6ab8abfcde46dba211732ab860be9afba2b54399.tar.bz2 | |
disas: nanoMIPS: Comment the decoder of 'gpr3.src.store' gpr encoding type
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>
Diffstat (limited to 'disas')
| -rw-r--r-- | disas/nanomips.cpp | 32 |
1 files changed, 32 insertions, 0 deletions
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 }; |