EXCW — Exception Wait

Instruction Word

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
9876543210
Format x24 - 24 bit(s) 0
EXCW 000000000010000010000000

Assembler Syntax

EXCW

C Syntax

#include <xtensa/tie/xt_exceptions.h>

extern void XT_EXCW(void);

Description

(please consult the Xtensa ® Instruction Set Architecture Reference Manual for any cross references and additional information)

EXCW waits for any exceptions of previously fetched instructions to be handled. Some Xtensa ISA implementations may have imprecise exceptions; on these implementations EXCW waits until all previous instruction exceptions are taken or the instructions are known to be exception-free. Because the instruction execution pipeline and exception handling is implementation-specific, the operation section below specifies only a call to the implementation's ExceptionWait function.

Operation

ExceptionWait

Exceptions

EveryInst Group (see EveryInst Group:)

Protos that use EXCW

proto EXCW { }{}{
EXCW;
}