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SubjectRe: [2.6.8] OOPS and SIGSEGV on altivec instruction on PowerPC 7540.
Date
This is odd. the 2.6.8 kernel should have the code that causes a SIGILL 
if !CONFIG_ALTIVEC. Can you enable CONFIG_KALLSYMS.

- kumar

On May 13, 2005, at 10:49 AM, Pawel Sikora wrote:

> Hi,
>
> simple runtime altivec detection from userspace causes an oops
> on the `vand` instruction. kernel was built *without* CONFIG_ALTIVEC.
> i think kernel should return a SIGILL instead of an oops ;-)
>
> Oops: kernel access of bad area, sig: 11 [#65]
> NIP: C0008B84 LR: C0007F2C SP: CF373F20 REGS: cf373e70 TRAP: 0300 Not
> tainted
> MSR: 00009032 EE: 1 PR: 0 FP: 0 ME: 1 IR/DR: 11
> DAR: 00000088, DSISR: 40000000
> TASK = c81e04f0[12983] 'altivec' THREAD: cf372000Last syscall: 174
> GPR00: C0007F2C CF373F20 C81E04F0 00000004 00000004 00030001 00000000
> 0FEE08D0
> GPR08: 0000F932 C0007F2C 00009032 C0350000 081E0788 00000000 00000000
> 100A37D8
> GPR16: 100A0000 00000000 100A0000 00000000 10070000 100A37C8 100AEF08
> 00000000
> GPR24: 100A1108 00000000 100A59A8 3002AEF8 3002BB80 3002AE60 0FFEA6FC
> 00000004
> Call trace: [c0007f2c]
>
>
>
> processor       : 0
> cpu             : 7450
> clock           : 700MHz
> revision        : 2.1 (pvr 8000 0201)
> bogomips        : 696.32
> machine         : PowerMac4,4
> motherboard     : PowerMac4,4 MacRISC2 MacRISC Power Macintosh
> detected as     : 80 (eMac)
> pmac flags      : 00000001
> L2 cache        : 256K unified
> memory          : 384MB
> pmac-generation : NewWorld
>
> --
> The only thing necessary for the triumph of evil
>   is for good men to do nothing.
>                                            - Edmund Burke
> <altivec.c>
-
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