[ECOS] run-time error " EXH 4"

[wangwei]

Hi:
I'm porting microwindow in ecos.Now it can success in runing mwin api.
But a while later , the gdb console got a message "EXH 4"from target,and the
target dump.
What is the meaning of this message?
And my target is arm7500 in 50MHz.but in microwindow,the operation of
windows is very slow. I think it would be faster in this cpu.Are there
anybody know it ? Help me .
Thinks