GPR
| Index | Alias | Usage | Preserved across calls |
| 0 | $zero | Constant zero | Unused |
| 1 | $ra | Return address | No |
| 2 | $tp | TLS | Unused |
| 3 | $sp | Stack pointer | Yes |
| 4-11 | $a0-$a7 | Argument registers | No |
| 4-5 | $v0-$v1 | Return value | No |
| 12-20 | $t0-$t8 | Temporary registers | No |
| 21 | $x | Reserved | Unused |
| 22 | $fp | Frame pointer | Yes |
| 23-31 | $s0-$s8 | Subroutine register variables | Yes |
FPR
| Index | Alias | Usage | Preserved across calls |
| 0-7 | $fa0-$fa7 | Argument registers | No |
| 0-1 | $fv0-$fv1 | Return value | No |
| 8-23 | $ft0-$ft15 | Temporary registers | No |
| 24-31 | $fs0-$fs7 | Soubroutine register variables | Yes |
Over!