why gcc 4.x default reserve 8 bytes for stack on linux when calling a method?
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Published on 2010-03-08T03:12:32Z
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2010/03/08
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as a beginner of asm, I am checking gcc -S generated asm code to learn.
why gcc 4.x default reserve 8 bytes for stack when calling a method?
func18 is the empty function with no return no param no local var defined. I can't figure out why 8 bytes is reserved here (neither any forum/site mention for the reason, ppl seems take it for granted) is it for the %ebp just push? or return type?! many thx!
.globl _func18
_func18:
pushl %ebp
movl %esp, %ebp
subl $8, %esp
.text
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