Re: [BUG,2.6.27] "fixpoint divide exception" while creating initramfs on Hercules

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On Thu, 5 Mar 2009 23:20:51 +0100
Frans Pop <elendil@xxxxxxxxx> wrote:

>  17180299.993240! Krnl GPRS: 00000000 000007d0 7fffffff fffff830
>  17180299.993503!            00000000 ffffffff 7fe34d58 0fc2e4f0
>  17180299.993748!            00000000 00002ee0 00000000 0fc2e4f0
>  17180299.994000!            0fc2e8dc 8007386e 0f281ec8 0f281e98
>  17180299.995002! Krnl Code: 800738aa: a71807d0         lhi     %r1,2000
>  17180299.995366!            800738ae: 8c200001         srdl    %r2,1
>  17180299.995687!            800738b2: 1d21             dr      %r2,%r1
>  17180299.996066!           >800738b4: 5810d10e         l       %r1,270(%r13)
>  17180299.996392!            800738b8: 1823             lr      %r2,%r3
>  17180299.996759!            800738ba: 4130f060         la      %r3,96(%r15)
>  17180299.997083!            800738be: 0de1             basr    %r14,%r1
>  17180299.997479!            800738c0: 5800f060         l       %r0,96(%r15)

The divident failed because the divident went negative. The srdl shifts
the divident by 1 to be able to use the instruction for a signed
division (dr) for an unsigned division. So the real divident is -4000
abd the divisor is 1000. The result won't fit into a 32 bit register.

So we need to find out why the divident went negative.

-- 
blue skies,
   Martin.

"Reality continues to ruin my life." - Calvin.

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