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List: freebsd-alpha
Subject: RE: cvs commit: src/sys/boot/alpha/common main.c
From: Matthew Jacob <mjacob () feral ! com>
Date: 2000-09-18 23:38:19
[Download RAW message or body]
This was the same pattern that got me. It's what had convinced me that
libstand was to blame. Gee- I dunno now...
On Mon, 18 Sep 2000, John Baldwin wrote:
> [ moved to -alpha ]
>
> On 18-Sep-00 Matthew Jacob wrote:
> >
> >>
> >> On 18-Sep-00 Matthew Jacob wrote:
> >> >
> >> > Really?
> >> >
> >> > Hmm. Thought we got this one for the moment.
> >> >
> >> > Are you sure you remembered to disklabel -B the new boot1?
> >>
> >> Yep. :( I have the ra's from the old loader that used to
> >> work (although I don't have a loader.sym for that) and for
> >> the new loader. I'll see what I can do with that.
> >
> > Does i die in loader or in boot1?
>
> Loader:
>
> 0x2001cce0 <memcpy>: mov a0,v0
> 0x2001cce4 <memcpy+4>: ble a2,0x2001cf34 <memcpy+596>
> 0x2001cce8 <memcpy+8>: subq a0,a1,t5
> 0x2001ccec <memcpy+12>: cmpult t5,a2,t5
> 0x2001ccf0 <memcpy+16>: bne t5,0x2001ce88 <memcpy+424>
> 0x2001ccf4 <memcpy+20>: addq a1,a2,a3
> 0x2001ccf8 <memcpy+24>: ldq_u t2,0(a1)
> 0x2001ccfc <memcpy+28>: xor a1,a0,t0
> 0x2001cd00 <memcpy+32>: and t0,0x7,t0
> 0x2001cd04 <memcpy+36>: and a0,0x7,t1
> 0x2001cd08 <memcpy+40>: bne t0,0x2001cd70 <memcpy+144>
> 0x2001cd0c <memcpy+44>: beq t1,0x2001cd24 <memcpy+68>
> 0x2001cd10 <memcpy+48>: ldq_u t3,0(a0)
> 0x2001cd14 <memcpy+52>: addq a2,t1,a2
> 0x2001cd18 <memcpy+56>: mskqh t2,a1,t2
>
> It dies with PC = 0 at that last address
>
> I guess it is dereferencing a NULL pointer or something silly like
> that?
>
> Hmm, looking in src/libc/alpha/string/bcopy.S:
>
> /* src & dst have same alignment */
> beq t1,bcopy_all_aligned
>
> ldq_u t3,0(DSTREG)
> addq SIZEREG,t1,SIZEREG
> mskqh t2,SRCREG,t2
> mskql t3,SRCREG,t3
> or t2,t3,t2
>
> So it looks like possibly a NULL source?
>
> --
>
> John Baldwin <jhb@FreeBSD.org> -- http://www.FreeBSD.org/~jhb/
> "Power Users Use the Power to Serve!" - http://www.FreeBSD.org/
>
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