diff options
Diffstat (limited to 'disas/nanomips.cpp')
| -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 7c561620c2..1c313f329f 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 }; |