[lkml]   [2005]   [Apr]   [5]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: crash in entry.S restore_all, 2.6.12-rc2, x86, PAGEALLOC

On Tue, 5 Apr 2005, Ingo Molnar wrote:
> esi: 009b63f9 edi: 00000001 ebp: f543a000 esp: f543bfc8
> i.e. esp & 0xfff was 0xfc8 - while i think it should normally be 0xfc4
> (page boundary minus size of pt_regs == 0 - 0x3c == 0xfc4). So somewhere
> we lost 4 bytes of esp? An extra popl, or an addl $4, %esp? But why dont
> we crash in that case

Normally, esp will be immediately reset by any user-land stuff: we'll
forget the old kernel stack entirely, and always re-load esp from the esp0
thing in the TSS.

And as long as we stay in kernel land, we'll obviously never touch the
esp/xss fields of pt_regs (except in this special case of doing the
speculative load of xss), so...

To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to
More majordomo info at
Please read the FAQ at

 \ /
  Last update: 2009-11-18 23:46    [W:0.091 / U:79.680 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site