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Ralph



Joined: 04 Oct 2003
Posts: 86
Ralph
This might be a dumb question, but could anyone explain to me what the difference between IRET and RET is? I know what they do, but why does IRET differ? What other information is placed on the stack when you INT and why? Is it mostly pmode information like access level and stuff? It's 12 bytes if I remember correctly, so what's in those other 8 bytes?
Post 04 Nov 2003, 06:30
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JohnFound



Joined: 16 Jun 2003
Posts: 3502
Location: Bulgaria
JohnFound
Interrupts ( hardware one and INT instruction too ) store in stack, besides return address, the flags register. So, the IRET restores flags too. This is not related to protected mode only. It is common behaviour.

Regards.
Post 04 Nov 2003, 06:44
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scientica
Retired moderator


Joined: 16 Jun 2003
Posts: 689
Location: Linköping, Sweden
scientica
I recomend that your read these pages in the intel manuals: (2nd Volume: instruction set ref.)
int: page 371 (3-330)
iret: page 386 (3-345)
and for comparision: ret: page 719 (3-678)

(it's by far too much to cut and pate (I've tried...))

_________________
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- Bradley Kuhn
Post 04 Nov 2003, 06:47
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