Re: [2.6.8] OOPS and SIGSEGV on altivec instruction on PowerPC 7540.

This is odd. the 2.6.8 kernel should have the code that causes a SIGILL=20=

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=20=

tainted
 MSR: 00009032 EE: 1 PR: 0 FP: 0 ME: 1 IR/DR: 11
 DAR: 00000088, DSISR: 40000000
 TASK =3D c81e04f0[12983] 'altivec' THREAD: cf372000Last syscall: 174
 GPR00: C0007F2C CF373F20 C81E04F0 00000004 00000004 00030001 00000000=20=

0FEE08D0
 GPR08: 0000F932 C0007F2C 00009032 C0350000 081E0788 00000000 00000000=20=

100A37D8
 GPR16: 100A0000 00000000 100A0000 00000000 10070000 100A37C8 100AEF08=20=

00000000
 GPR24: 100A1108 00000000 100A59A8 3002AEF8 3002BB80 3002AE60 0FFEA6FC=20=

00000004
 Call trace: [c0007f2c]



processor =A0 =A0 =A0 : 0
 cpu =A0 =A0 =A0 =A0 =A0 =A0 : 7450
 clock =A0 =A0 =A0 =A0 =A0 : 700MHz
 revision =A0 =A0 =A0 =A0: 2.1 (pvr 8000 0201)
 bogomips =A0 =A0 =A0 =A0: 696.32
 machine =A0 =A0 =A0 =A0 : PowerMac4,4
 motherboard =A0 =A0 : PowerMac4,4 MacRISC2 MacRISC Power Macintosh
 detected as =A0 =A0 : 80 (eMac)
 pmac flags =A0 =A0 =A0: 00000001
 L2 cache =A0 =A0 =A0 =A0: 256K unified
memory =A0 =A0 =A0 =A0 =A0: 384MB
 pmac-generation : NewWorld

--=20
The only thing necessary for the triumph of evil
 =A0 is for good men to do nothing.
 =A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=

=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 - Edmund Burke

<altivec.c>=