"other problem c51 dont use only stack for pop and push some of variable and other push if see compiled program"

Keil C51 does not use the stack for variables - precisely because of the 8051's limitations!

"any way move stack to xram and restore it by compiler?"

No.
I s'pose you could conceivably hack something up in assembler but, if it's really come to that, you'd be far better off changing processor!