Re: [Qemu-ppc] Booting AIX on qemu-system-ppc, kernel not started successfully

[Liang Guo]

On Mon, Feb 20, 2012 at 7:03 PM, Alexander Graf <address@hidden> wrote:
>> (qemu) info registers
>> info registers
>> NIP 0000000000000040   LR 00000000000cfc2c CTR 00000000000cfc28 XER 
>> 0000000000000000
>
> NIP is 0x40. How did it manage to get that low? If I had to guess, I'd say 
> this is due to a NULL pointer dereference. Try setting a breakpoint to 
> address 0 with the gdb stub and see where it comes from. Most likely we're 
> missing some stuff in the device tree and/or hypercall implementations.

I add a  breakpoint at *0x0, the nip becomes 0x40 without trigger the
breakpoint.

For the kernel entry point is 0x00022E28, then it jumps to 0x22e88,
the asm code as below:

(gdb) x/10i $pc
0x22e88:        mflr    r13
0x22e8c:        lil     r6,1
0x22e90:        mfmsr   r7
0x22e94:        .long 0x78c7f80e
0x22e98:        .long 0x7ce00164
0x22e9c:        ics
0x22ea0:        rlinm   r3,r3,0,0,31
0x22ea4:        rlinm   r5,r5,0,0,31
0x22ea8:        ai      r13,r13,-44
0x22eac:        .long 0xe82d0078

After 0x22e9c, NIP becomes to 0x40.

What the "ics" means ?

-- 
Liang Guo
http://bluestone.cublog.cn