sstatus

Supervisor Status

The sstatus register tracks and controls the hart’s current operating state.

All fields in sstatus are aliases of the same field in mstatus.

Attributes

Defining Extension

S, version >= 0

CSR Address

0x100

Length

32-bit

64-bit

Privilege Mode

Format

This CSR format changes dynamically.

Field Summary

Name Location Type Reset Value

SD

RO-H

UNDEFINED_LEGAL

UXL

33:32

UNDEFINED_LEGAL

MXR

UNDEFINED_LEGAL

SUM

UNDEFINED_LEGAL

XS

16:15

UNDEFINED_LEGAL

FS

14:13

RW-H

UNDEFINED_LEGAL

VS

10:9

RW-H

UNDEFINED_LEGAL

SPP

RW-H

UNDEFINED_LEGAL

UBE

UNDEFINED_LEGAL

SPIE

RW-H

UNDEFINED_LEGAL

SIE

RW-H

UNDEFINED_LEGAL

Fields

`SD`

Location

31 when CSR[mstatus].SXL == 0
63 when CSR[mstatus].SXL == 1

Description

State Dirty

Alias of mstatus.SD.

Type

RO-H

Reset value

UNDEFINED_LEGAL

`UXL`

UXL is only defined in RV64 (CSR[mstatus].SXL == 1)

Location: 33:32
Description: U-mode XLEN

Alias of mstatus.UXL.
Type: RO
Reset value: UNDEFINED_LEGAL

`MXR`

Location: 19
Description: Make eXecutable Readable

Alias of mstatus.MXR.
Type: RW
Reset value: UNDEFINED_LEGAL

`SUM`

Location: 18
Description: permit Supervisor Memory Access

Alias of mstatus.SUM.
Type: RW
Reset value: UNDEFINED_LEGAL

`XS`

Location: 16:15
Description: Custom (X) extension context Status.

Alias of mstatus.XS.
Type: RO
Reset value: UNDEFINED_LEGAL

`FS`

Location: 14:13
Description: Floating point context status.

Alias of mstatus.FS.
Type: RW-H
Reset value: UNDEFINED_LEGAL

`VS`

Location: 10:9
Description: Vector context status.

Alias of mstatus.VS.
Type: RW-H
Reset value: UNDEFINED_LEGAL

`SPP`

Location: 8
Description: S-mode Previous Privilege

Alias of mstatus.SPP.
Type: RW-H
Reset value: UNDEFINED_LEGAL

`UBE`

Location: 6
Description: U-mode Big Endian

Alias of mstatus.UBE.
Type: RO
Reset value: UNDEFINED_LEGAL

`SPIE`

Location: 5
Description: S-mode Previous Interrupt Enable

Alias of mstatus.SPIE.
Type: RW-H
Reset value: UNDEFINED_LEGAL

`SIE`

Location: 1
Description: S-mode Interrupt Enable

Alias of mstatus.SIE.
Type: RW-H
Reset value: UNDEFINED_LEGAL