Slot Inst | 6 3 | 6 2 | 6 1 | 6 0 | 5 9 | 5 8 | 5 7 | 5 6 | 5 5 | 5 4 | 5 3 | 5 2 | 5 1 | 5 0 | 4 9 | 4 8 | 4 7 | 4 6 | 4 5 | 4 4 | 4 3 | 4 2 | 4 1 | 4 0 | 3 9 | 3 8 | 3 7 | 3 6 | 3 5 | 3 4 | 3 3 | 3 2 | 3 1 | 3 0 | 2 9 | 2 8 | 2 7 | 2 6 | 2 5 | 2 4 | 2 3 | 2 2 | 2 1 | 2 0 | 1 9 | 1 8 | 1 7 | 1 6 | 1 5 | 1 4 | 1 3 | 1 2 | 1 1 | 1 0 | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Format x24 - 24 bit(s) | 0 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
RFWU | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 1 | 0 | 1 | 0 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
RFWU
(please consult the Xtensa ® Instruction Set Architecture Reference Manual for any cross references and additional information)
RFWU
returns from an exception that went to one of the three window underflow vectors. It sets PS.EXCM
back to 0
, sets the WindowStart
bit of the registers that were reloaded, restores WindowBase
from PS.OWB
, and then jumps to the address in EPC[1]
. PS.UM
is left unchanged.
RFWU
is a privileged instruction.
if CRING != 0 then Exception (PrivilegedCause) else PS.EXCM ← 0 nextPC ← EPC[1] WindowStartWindowBase ← 1 WindowBase ← PS.OWB endif
In | Out |
---|---|
EPC1 Estage , WindowBase Estage ,
WindowStart Estage , PSOWB Estage
|
PSEXCM Estage , WindowBase Estage ,
WindowStart Estage
|