| 222,7 → 222,7 |
|---|
| sub $k0, 8 # 8=SYSCALL |
| |
| beqz $k0, syscall_shortcut |
| add $k0, 8 # Revert $k1 back to correct exc number |
| add $k0, 8 # Revert $k0 back to correct exc number |
| |
| REGISTERS_STORE_AND_EXC_RESET $sp |
| |
| 239,11 → 239,13 |
|---|
| #define SS_SP EOFFSET_SP |
| #define SS_STATUS EOFFSET_STATUS |
| #define SS_EPC EOFFSET_EPC |
| #define SS_K1 EOFFSET_K1 |
| syscall_shortcut: |
| # We have a lot of space on the stack, with free use |
| mfc0 $t1, $epc |
| mfc0 $t0, $status |
| sw $t1,SS_EPC($sp) # Save EPC |
| sw $k1,SS_K1($sp) # Save k1, which is not saved during context switch |
| |
| and $t2, $t0, REG_SAVE_MASK # Save only KSU,EXL,ERL,IE |
| li $t3, ~(0x1f) |
| 270,6 → 272,7 |
|---|
| |
| # restore epc+4 |
| lw $t0,SS_EPC($sp) |
| lw $k1,SS_K1($sp) |
| addi $t0, $t0, 4 |
| mtc0 $t0, $epc |
| |