How really works Single-Stepping?

flat assembler
Message board for the users of flat assembler.

Index > OS Construction > How really works Single-Stepping?

Author

Thread

MAD_DËMON

Joined: 03 Mar 2006
Posts: 23

MAD_DËMON 11 Mar 2006, 02:46

i don't know well when Single-Stepping is enabled (FLAGS.TF=1) if the Interrupt 01 is triggered after or before an instruction completes.
in AMD system programming manuals says that the instructions INTx INTO and INT3 clean the Trap Flag, then this mean that these instructions cannot be traced by Single-Stepping?

_________________
Tah rah rah boom de ay, I blew some guy away, his brains turned into spray, I was paid well that day

11 Mar 2006, 02:46

Octavio

Joined: 21 Jun 2003
Posts: 366
Location: Spain

Octavio 11 Mar 2006, 12:04

MAD_DËMON wrote:

i don't know well when Single-Stepping is enabled (FLAGS.TF=1) if the Interrupt 01 is triggered after or before an instruction completes.
in AMD system programming manuals says that the instructions INTx INTO and INT3 clean the Trap Flag, then this mean that these instructions cannot be traced by Single-Stepping?

the Interrupt 01 is triggered after an instruction completes.
To trace interrupts the INTX is emulated by some debuggers.

11 Mar 2006, 12:04

< Last Thread | Next Thread >

Forum Rules:

You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
You cannot attach files in this forum
You can download files in this forum