MBR: relocation minimization

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Tomasz Grysztar
Assembly Artist

Joined: 16 Jun 2003
Posts: 7724
Location: Kraków, Poland

Tomasz Grysztar

Yes, that's a risky thing to do.
BTW, what do we know about IF on entry from BIOS? Because the only safe way to move stack when IF=1 is to use LSS.

06 Mar 2009, 09:49

revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 17279
Location: In your JS exploiting you and your system

revolution

You can also use the two instruction sequence -

Code:

mov ss,something
mov sp,anotherThing

CPU ignores interrupts for one instruction cycle after the mov ss

06 Mar 2009, 09:58

Tomasz Grysztar
Assembly Artist

Joined: 16 Jun 2003
Posts: 7724
Location: Kraków, Poland

Tomasz Grysztar

Oh, right, that was working already on 8086. Only on 8088 it was bugged. Smile

06 Mar 2009, 10:35

bitRAKE

Joined: 21 Jul 2003
Posts: 2915
Location: [RSP+8*5]

bitRAKE

I wonder how many computers boot daily with various MBRs?

06 Mar 2009, 17:01

revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 17279
Location: In your JS exploiting you and your system

revolution

I wonder how many computers stay on 24/7 and boot rarely?

06 Mar 2009, 17:10

bitRAKE

Joined: 21 Jul 2003
Posts: 2915
Location: [RSP+8*5]

bitRAKE

Having tried to educate problem about the various power/time saving techniques, I can tell you that it is not as successful as I'd like it to be. I cringe watching someone at the coffee shop spend 5 minutes to close all their work and shutdown Windows.

<ah, another topic branch - I've got that MBR here somewhere under this stack of windows...>

06 Mar 2009, 17:40

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