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Message
From: Ben A. Abderazek<ben@s...>
Date: Fri May 14 11:56:06 CEST 2004
Subject: [openrisc] What information should be pushed to the Stack for Call
Instruction?
Dear Helper, When "call" instruction is executed (or earlier decoded), I know that the return address should be pushed to a stack (stack-register) if more that a call will be needed.
My question is do I also have to push the condition code register (N, Z,V, and C) and then pop them again with the return address when return from call (rfc) instruction is executed or I just push the return address (the PC of the call + 2 for 16-bit processor).
I am thinking to push only the return address to the stack-register during call and I push the "ra" and CCR flags for interrupt only.
Many thanks,
/Ben
UEC, IS
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