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Assembly Language: Function Calls - Princeton University

1 Assembly Language: Function Calls "Jennifer Rexford!2 Goals of this Lecture" Function call problems:! Calling and returning! Passing parameters! Storing local variables! Handling registers without interference! Returning values! IA-32 solutions to those problems! Pertinent instructions and conventions!3 Recall from Last Lecture"Examples of Operands! Immediate Operand! movl $5, ..! CPU uses 5 as source operand! movl $i, ..! CPU uses address denoted by i as source operand! Register Operand! movl %eax.

call addr pushl %eip jmp addr ESP before call 0 Note: can’t really access EIP directly, but this is implicitly what call is doing Call instruction pushes return address (old EIP) onto stack • EIP (instruction pointer register) points to next instruction to be executed!

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