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

Requirement

Defining extensions

S	Supervisor mode

CSR Address

0x100

Length

* 32 when CSR[mstatus].SXL == 0 * 64 when CSR[mstatus].SXL == 1

Privilege Mode

S

Format

This CSR format changes dynamically.

sstatus Format when CSR[mstatus].SXL == 0

Figure 1. sstatus Format when CSR[mstatus].SXL == 0

sstatus Format when CSR[mstatus].SXL == 1

Figure 2. sstatus Format when CSR[mstatus].SXL == 1

Field Summary

Name

Location

Type

Reset Value

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

RO-H

UNDEFINED_LEGAL

33:32

RO

2

19

RW

UNDEFINED_LEGAL

18

RW

UNDEFINED_LEGAL

16:15

RO

UNDEFINED_LEGAL

14:13

RW-H

UNDEFINED_LEGAL

10:9

RW-H

UNDEFINED_LEGAL

8

RW-H

UNDEFINED_LEGAL

6

RO

UNDEFINED_LEGAL

5

RW-H

UNDEFINED_LEGAL

1

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`

Location: 33:32
Description: U-mode XLEN

Alias of mstatus.UXL.

Type: RO
Reset value: 2

`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