[Lguest] lguest: mapping switcher would thwack fixmap
pebolle at tiscali.nl
Wed Apr 17 20:15:56 EST 2013
On Wed, 2013-04-17 at 19:22 +0930, Rusty Russell wrote:
> Paul Bolle <pebolle at tiscali.nl> writes:
> > 3) I'll search the mailing list archive for the "unhandled trap" error.
> > That looks familiar. I'm guessing it's not introduced by this patch.
> OK, that's happening really early on. Strange that it's mapping at
> 0x400000, vs 0x100000 for me...
bzImage versus vmlinux?
$ objdump -j .text -h vmlinux
vmlinux: file format elf32-i386
Idx Name Size VMA LMA File off Algn
0 .text 00527545 c0400000 00400000 00001000 2**6
CONTENTS, ALLOC, LOAD, RELOC, READONLY, CODE
> Can you send me your vmlinux and .config (offlist)?
It's related to CONFIG_OLPC:
$ objdump -j .text -d vmlinux | grep c0400062
c0400054: 74 0c je c0400062 <_text+0x62>
c0400062: 0f 20 d8 mov %cr3,%eax
And "mov %cr3,%eax" at offset 0x62 apparently is found in
/* save OFW's pgdir table for later use when calling into OFW */
movl %cr3, %eax
movl %eax, pa(olpc_ofw_pgd)
I'm currently rebuilding with CONFIG_OLPC disabled. I hope to report
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