| 251,23 → 251,26 |
|---|
| sw $t2,SS_STATUS($sp) |
| mtc0 $t0, $status |
| |
| # CALL Syscall handler |
| jal syscall_handler |
| sw $v0, SS_ARG4($sp) # save v0 - arg4 to stack |
| |
| # restore epc+4 |
| lw $t0,SS_EPC($sp) |
| addi $t0, $t0, 4 |
| mtc0 $t0, $epc |
| |
| # restore status |
| mfc0 $t0, $status |
| lw $t1,SS_STATUS($sp) |
| |
| # Change back to EXL=1(from last exception), otherwise |
| # an interrupt could rewrite the CP0-EPC |
| li $t2, ~REG_SAVE_MASK # Mask UM,EXL,ERL,IE |
| and $t0, $t0, $t2 |
| or $t0, $t0, $t1 # Copy UM,EXL,ERL,IE from saved status |
| mtc0 $t0, $status |
| |
| # restore epc+4 |
| lw $t0,SS_EPC($sp) |
| addi $t0, $t0, 4 |
| mtc0 $t0, $epc |
| |
| lw $sp,SS_SP($sp) # restore sp |
| |
| eret |