On 4/26/06, gautam borad <borad.gautam@xxxxxxxxx> wrote:
> Hi,
> Who passes the address to do_page_fault() in arch/ppc/mm/fault.c ?
> I know that its in the DAR register for ppc ( cr2 in x86) but who puts
> it there?
I think its the CPU harware responsible for filling cr2 with fauting
address, there is no software instruction executed for this.
If I am not wrong, "address" ( got from cr2 register) in
do_page_fault() will be same as regs->eip , as in Linux we do not use
the segmentation concept and so the virtual address space is same a s
linear address space. Correct me if I am wrong anywhere.
Gaurav
> My question will be sane if you read the problem im facing ...
>
> I'm using a test prog which just calls malloc().
> For debugging purpose i've put the foll in arch/ppc/mm/fault.c :
>
> printk("\nerror : vm_start = 0x%08x vm_end = 0x%08x
> Address = 0x%08x\n ",vma->vm_start,vma->vm_end,address);
>
> Now when i run the test program i get the foll :
>
> vm_start = 0x10011000 vm_end = 0x10219000 Address = 0x101e9000
> vm_start = 0x10011000 vm_end = 0x10219000 Address = 0x101ea000
> vm_start = 0x10011000 vm_end = 0x10219000 Address = 0x101eb000
> vm_start = 0x10000000 vm_end = 0x10001000 Address = 0x00000024
> Oops: kernel access of bad area, sig: 11
> < ... more dump ....>
>
> Where does the address 0x00000024 comes from??
> Is this a cache/tlb problem?
>
> Thanks in advance.
>
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>
--
--
-Gaurav
Email: gauravd.chd@xxxxxxxxx
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