scause)When a trap is received in Supervisor mode, scause is
written with a code indicating the event that caused the trap. When the event is an
interrupt, the most significant bit (MSb) of scause is set to 1, and the least significant
bits (LSb) indicate the interrupt number, using the same encoding as the bit positions in
sip. For example, a Supervisor Timer interrupt causes scause to be set to
0x8000_0000_0000_0005. scause is also used to indicate the cause of
synchronous exceptions, if the MSb of scause is set to 0.
| Bits | Field Name | Attributes | Description |
|---|---|---|---|
| [62:0] | Exception Code | WLRL | A code identifying the last exception. Supervisor Interrupt Exception codes are listed in Table 2. |
| 63 | Interrupt | WARL | 1 if the trap was caused by an interrupt; 0 otherwise. |
| Interrupt | Exception Code | Description |
|---|---|---|
|
1 1 1 1 1 1 1 |
0 1 2-4 5 6-8 9 ≥10 |
Reserved Supervisor software interrupt Reserved Supervisor timer interrupt Reserved Supervisor external interrupt Reserved |
| 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 |
0 1 2 3 4 5 6 7 8 9-11 12 13 14 15 ≥16 |
Instruction address misaligned Instruction access fault Illegal instruction Breakpoint Reserved Load access fault Store/AMO address misaligned Store/AMO access fault Environment call from U-mode Reserved Instruction page fault Load page fault Reserved Store/AMO page fault Reserved |