mtinst

Machine Trap Instruction Register

When a trap is taken into M-mode, mtinst is written with a value that, if nonzero, provides information about the instruction that trapped, to assist software in handling the trap. The values that may be written to mtinst on a trap are documented in TODO.

mtinst is a WARL register that need only be able to hold the values that the implementation may automatically write to it on a trap.

Attributes

CSR Address	0x34a
Defining extension	H, version >= 0
Length	64-bit
Privilege Mode	M

CSR Address

0x34a

Defining extension

H, version >= 0

Length

64-bit

Privilege Mode

Format

Figure 1. mtinst format

Field Summary

Name Location Type Reset Value

Name	Location	Type	Reset Value
`VALUE`	63:0	RW-H	UNDEFINED_LEGAL

VALUE

63:0

RW-H

UNDEFINED_LEGAL

Fields

`VALUE`

Location: mtinst[63:0]
Description: Exception-specific information for a trap into M-mode.
Type

RW-H	Read-Write with Hardware update Field is writable by software. Any value that fits in the field is acceptable. Hardware also updates the field without an explicit software write.

Reset value: UNDEFINED_LEGAL