Messages in this thread | | | Date | Fri, 15 Oct 2021 09:18:32 +0900 | From | Masami Hiramatsu <> | Subject | Re: [PATCH 6/8] ARM: clang: Do not relay on lr register for stacktrace |
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On Thu, 14 Oct 2021 17:53:24 +0100 "Russell King (Oracle)" <linux@armlinux.org.uk> 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: https://www.armlinux.org.uk/developer/patches/ > FTTP is here! 40Mbps down 10Mbps up. Decent connectivity at last!
-- Masami Hiramatsu <mhiramat@kernel.org>
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