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when i do int 0x20

it do the following:

0xc00014e0 push 0
0xc00014e2 push 0x20
0xc00014e4 jmp stub

but when cpu ( i assume pic as i remapped to ) fire the interrupt it start from the following

0xc00014e2 push 0x20
0xc00014e4 jmp stub

it dont even push user ss, user esp on the stack in both case.
what is the problem.?

i am using bochs.

The processor only pushes SS/ESP on the stack when a privilege change occurs.

thanks combuster. but i dont understand when cpu do the interrupt, why it start from the second line

I would assume that you have the base address in your IDT incorrect somehow

I did hear some things about bochs and semi-broken breakpoints, and I see many more newbies use dated versions of that program. If you are using it, you can do a print-stack to see what's on it (and see if there's that push 0 has been performed inbetween). Similarly, you can verify thepowersgang's notion by asking bochs' debugger for "info idt".

In any case, the CPU will be doing what it was told to. Therefore, don't ask the CPU why, but yourself

strange behavior of bochs.
it is working now.

to combuster,
i had checked print-stack before i post it here.

i removed the code of masking the interrupts. then it is working. but i dont think that is the problem.