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devel / comp.lang.asm.x86 / TF

SubjectAuthor
* TFPaul Edwards
+- TFAlexei A. Frounze
+- TFGeorge Neuner
`* TFwolfgang kern
 `- TFPaul Edwards

1
TF

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From: mutazilah@nospicedham.gmail.com (Paul Edwards)
Newsgroups: comp.lang.asm.x86
Subject: TF
Date: Sat, 19 Nov 2022 11:09:42 -0800 (PST)
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 by: Paul Edwards - Sat, 19 Nov 2022 19:09 UTC

I have implemented TF (trap flag) for the 8086.

But when I looked up RBIL, it doesn't say that TF
also works for the 80386. INT 1 is complicated
instead.

So can I single-step an 80386 program?

It looks like x'cc' still works on an 80386, invoking
INT 3 (from my reading of RBIL).

Anyone know for sure?

Thanks. Paul.

Re: TF

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From: alexfrunews@nospicedham.gmail.com (Alexei A. Frounze)
Newsgroups: comp.lang.asm.x86
Subject: Re: TF
Date: Sat, 19 Nov 2022 14:09:30 -0800 (PST)
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 by: Alexei A. Frounze - Sat, 19 Nov 2022 22:09 UTC

On Saturday, November 19, 2022 at 11:23:04 AM UTC-8, Paul Edwards wrote:
> I have implemented TF (trap flag) for the 8086.
>
> But when I looked up RBIL,

Why not read the intel or AMD documentation?

> it doesn't say that TF
> also works for the 80386.

It does, all the way through Pentium.

Alex

Re: TF

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From: gneuner2@nospicedham.comcast.net (George Neuner)
Newsgroups: comp.lang.asm.x86
Subject: Re: TF
Date: Sat, 19 Nov 2022 17:32:09 -0500
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 by: George Neuner - Sat, 19 Nov 2022 22:32 UTC

On Sat, 19 Nov 2022 11:09:42 -0800 (PST), Paul Edwards
<mutazilah@nospicedham.gmail.com> wrote:

>I have implemented TF (trap flag) for the 8086.
>
>But when I looked up RBIL, it doesn't say that TF
>also works for the 80386. INT 1 is complicated
>instead.
>
>So can I single-step an 80386 program?
>
>It looks like x'cc' still works on an 80386, invoking
>INT 3 (from my reading of RBIL).
>
>Anyone know for sure?
>
>Thanks. Paul.

INT 3 works on all x86 processors, but the response differs depending
on whether you are in real mode or protected mode.

Re: TF

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From: nowhere@nospicedham.nevernet.at (wolfgang kern)
Newsgroups: comp.lang.asm.x86
Subject: Re: TF
Date: Mon, 21 Nov 2022 16:32:49 +0100
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 by: wolfgang kern - Mon, 21 Nov 2022 15:32 UTC

On 19/11/2022 20:09, Paul Edwards wrote:
> I have implemented TF (trap flag) for the 8086.
>
> But when I looked up RBIL, it doesn't say that TF
> also works for the 80386. INT 1 is complicated
> instead.
>
> So can I single-step an 80386 program?
>
> It looks like x'cc' still works on an 80386, invoking
> INT 3 (from my reading of RBIL).
>
> Anyone know for sure?

yes, CC work on all x86.
but any decent debugger use Traps instead:
a) by setting TF to single step one instruction w/o
the need for replace/insert a byte there.
b) by setting breakpoints [DATA or CODE or I/O] to
trap at occurrence (reason for debug-registers).
note: CC work different to the avoidable CD03.
__
wolfgang

Re: TF

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From: mutazilah@nospicedham.gmail.com (Paul Edwards)
Newsgroups: comp.lang.asm.x86
Subject: Re: TF
Date: Mon, 21 Nov 2022 14:27:41 -0800 (PST)
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 by: Paul Edwards - Mon, 21 Nov 2022 22:27 UTC

On Monday, November 21, 2022 at 11:37:26 PM UTC+8, wolfgang kern wrote:
> On 19/11/2022 20:09, Paul Edwards wrote:
> > I have implemented TF (trap flag) for the 8086.
> >
> > But when I looked up RBIL, it doesn't say that TF
> > also works for the 80386. INT 1 is complicated
> > instead.
> >
> > So can I single-step an 80386 program?
> >
> > It looks like x'cc' still works on an 80386, invoking
> > INT 3 (from my reading of RBIL).
> >
> > Anyone know for sure?

> yes, CC work on all x86.
> but any decent debugger use Traps instead:
> a) by setting TF to single step one instruction w/o
> the need for replace/insert a byte there.
> b) by setting breakpoints [DATA or CODE or I/O] to
> trap at occurrence (reason for debug-registers).
> note: CC work different to the avoidable CD03.

Ok, thanks for that information.

I am interested in restricting myself to the same tools
that Tim Paterson had when creating the precursor
to MSDOS, with the difference that I am
doing 32-bit C programming instead of 16-bit
assembler programming, so when I debug at the
assembler level, it is almost all generated code.

BFN. Paul.

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