linux-kernel - Re: Debugging APM - cat /proc/apm produces oops

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Message-Id: <200607231641.33495.linux@rainbow-software.org>
Date:	Sun, 23 Jul 2006 16:41:33 +0200
From:	Ondrej Zary <linux@...nbow-software.org>
To:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: Debugging APM - cat /proc/apm produces oops

On Sunday 23 July 2006 16:30, Ondrej Zary wrote:
> I've tried calling the APM 0x530A function from DOS (real mode, int 15h)
> and single-stepping the BIOS APM code (using good old user-friendly Turbo
> Debugger). Noticed some OUTs to 0xB1 (or something like that), then some
> PCI accesses (0xCF8 and 0xCFC) and then IP ended in area of all zeros. When
> I step over the int 15h call, it works fine - returns correct info.

Sorry, this was my bad. It works fine even when single stepping. I've made a 
mistake and stepped over the ending int 20h instruction of my .com program...

I'm probably going to write down complete sequence of instructions which get 
executed during the call.

-- 
Ondrej Zary
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