[lkml]   [2021]   [Oct]   [14]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: [PATCH 6/8] ARM: clang: Do not relay on lr register for stacktrace
On Thu, 14 Oct 2021 17:53:24 +0100
"Russell King (Oracle)" <> wrote:

> On Fri, Oct 08, 2021 at 09:29:08PM +0900, Masami Hiramatsu wrote:
> > Currently the stacktrace on clang compiled arm kernel uses the 'lr'
> > register to find the first frame address from pt_regs. However, that
> > is wrong after calling another function, because the 'lr' register
> > is used by 'bl' instruction and never be recovered.
> >
> > As same as gcc arm kernel, directly use the frame pointer (x11) of
> > the pt_regs to find the first frame address.
> Can I ask that the subject line is corrected. It's "rely" not "relay".

Oops, yes, that's my typo. Thanks for correcting!

> Also, the frame pointer is called "r11" not "x11" if you want to use
> the numerical register reference for 32-bit ARM registers.

Oh, I mixed up the register name between arm64 and ARM...

Thank you,

> Thanks.
> --
> RMK's Patch system:
> FTTP is here! 40Mbps down 10Mbps up. Decent connectivity at last!

Masami Hiramatsu <>

 \ /
  Last update: 2021-10-15 02:19    [W:0.092 / U:1.716 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site