Date: Tue, 20 May 1997 12:11:21 +0900 From: Kazutaka YOKOTA <yokota@zodiac.mech.utsunomiya-u.ac.jp> To: dg@root.com Cc: freebsd-hackers@freebsd.org, freebsd-bugs@freebsd.org, yokota@zodiac.mech.utsunomiya-u.ac.jp Subject: Re: trap type 29 on P6 Message-ID: <199705200311.MAA17969@zodiac.mech.utsunomiya-u.ac.jp> In-Reply-To: Your message of "Mon, 19 May 1997 19:43:58 MST." <199705200243.TAA07620@implode.root.com> References: <199705200243.TAA07620@implode.root.com>
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>>A PentiumPro user is occasionally getting the trap type 29 when using >>the psm driver (PR i386/3462). What does this trap mean? The trapped >>instruction doesn't look remotely like an invalid instruction. >>sys/i386/i386/trap.c doesn't supply a message for this trap type. >> >>He is using PentiumPro 200Mhz on ASUS P/I-P65UP5. >> >>> Using a PS/2 mouse with std. PC kbd and psm0 enabled causes the >>> following kernel trap after a while (with DDB turned on): >>> >>> instruction pointer = 0x8:0xf01887cb >>> stack pointer = 0x10:0xf01a1f3c >>> frame pointer = 0x10:0xf01a1f40 >>> code segment = base 0x0, limit 0xfffff, type 0x1b >>> = DPL 0, pres 1, def32 1, gran 1 >>> processor eflags = interrupt enabled, IOPL = 0 >>> current process = Idle >>> interrupt mask = tty >>> kernel: type 29 trap, code=0 >>> Stopped at _read_kbd_data_no_wait+0x37: andl $0xff,%eax > > Is the instruction right before this one an inb or outb? I've seen this >before on P6 machines... Exactly!!. We have: movl (%ebx),%edx inb %dx,%al andl $255,%eax It's reading the port 0x60 for keyboard data. Kazu
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