HOW CAN I STORE ARM USER MODE REGISTERS WHILE IN INTERRUPT MODE?

HELLO ,

PLEASE HELP! I NEED TO SWITCH IMMEADITELY BACK TO USER MODE WHILE I AM IN INTERRUPT MODE USING ARM LPC2148 PROCESSOR.I NEED TO STORE THE SP AND OTHER USER MODE REGISTERS WHILE I AM IN INTERRUPT MODE.
How can i do this in assembly language.I am using KeiluVision.

Thanks alot for your feedback

I am not sure how CPU will behave changing mode when servicing interrupt in IRQ mode.

mode can be changed by changing modebits M0-M4 in CPSR register.

can you tell me why you want to store SP? as in IRQ mode SP is banked so need not to be saved.

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