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Ralph

Joined: 04 Oct 2003
Posts: 86

Ralph 04 Nov 2003, 06:30

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?

04 Nov 2003, 06:30

JohnFound

Joined: 16 Jun 2003
Posts: 3499
Location: Bulgaria

JohnFound 04 Nov 2003, 06:44

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.

04 Nov 2003, 06:44

scientica
Retired moderator

Joined: 16 Jun 2003
Posts: 689
Location: Linköping, Sweden

scientica 04 Nov 2003, 06:47

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...))

_________________
... a professor saying: "use this proprietary software to learn computer science" is the same as English professor handing you a copy of Shakespeare and saying: "use this book to learn Shakespeare without opening the book itself.
- Bradley Kuhn

04 Nov 2003, 06:47

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