linux-kernel - Re: [PATCH] scripts/decode_stacktrace.sh: Use LLVM environment variable

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Date: Fri, 15 Dec 2023 13:19:18 -0800
From: Justin Stitt <justinstitt@...gle.com>
To: Elliot Berman <quic_eberman@...cinc.com>
Cc: Nathan Chancellor <nathan@...nel.org>, Nick Desaulniers <ndesaulniers@...gle.com>, 
	Bill Wendling <morbo@...gle.com>, Manuel Traut <manut@...utronix.de>, linux-arm-msm@...r.kernel.org, 
	linux-kernel@...r.kernel.org, llvm@...ts.linux.dev
Subject: Re: [PATCH] scripts/decode_stacktrace.sh: Use LLVM environment variable

Hi,

On Fri, Dec 15, 2023 at 10:27 AM Elliot Berman <quic_eberman@...cinc.com> wrote:
>
> When using LLVM as the compiler, decode_stacktrace should also use
> llvm-addr2line. Check if LLVM is set and add the appropriate
> suffix/prefix.
>
> Signed-off-by: Elliot Berman <quic_eberman@...cinc.com>
> ---

I tried it out by dropping a random dump_stack() call into the init
phase of the kernel and redirecting the serial console output to a log
file. Using the pre-(this patch) and post-(this patch) script yields
good stack trace results. It seems llvm-addr2line is a drop-in
replacement.

Tested-by: Justin Stitt <justinstitt@...gle.com>

>  scripts/decode_stacktrace.sh | 12 +++++++++++-
>  1 file changed, 11 insertions(+), 1 deletion(-)
>
> diff --git a/scripts/decode_stacktrace.sh b/scripts/decode_stacktrace.sh
> index 564c5632e1a2..189b00f4e120 100755
> --- a/scripts/decode_stacktrace.sh
> +++ b/scripts/decode_stacktrace.sh
> @@ -16,6 +16,16 @@ elif type c++filt >/dev/null 2>&1 ; then
>         cppfilt_opts=-i
>  fi
>
> +if [[ "${LLVM}" == "1" ]] ; then
> +       addr2line="llvm-addr2line"
> +elif [[ "${LLVM}" == */ ]] ; then
> +       addr2line="${LLVM}llvm-addr2line"
> +elif [[ "${LLVM}" == -* ]] ; then
> +       addr2line="llvm-addr2line${LLVM}"
> +else
> +       addr2line="${CROSS_COMPILE}addr2line"
> +fi
> +
>  if [[ $1 == "-r" ]] ; then
>         vmlinux=""
>         basepath="auto"
> @@ -169,7 +179,7 @@ parse_symbol() {
>         if [[ $aarray_support == true && "${cache[$module,$address]+isset}" == "isset" ]]; then
>                 local code=${cache[$module,$address]}
>         else
> -               local code=$(${CROSS_COMPILE}addr2line -i -e "$objfile" "$address" 2>/dev/null)
> +               local code=$(${addr2line} -i -e "$objfile" "$address" 2>/dev/null)
>                 if [[ $aarray_support == true ]]; then
>                         cache[$module,$address]=$code
>                 fi
>
> ---
> base-commit: 3f7168591ebf7bbdb91797d02b1afaf00a4289b1
> change-id: 20231214-llvm-decode-stacktrace-09538979006d
>
> Best regards,
> --
> Elliot Berman <quic_eberman@...cinc.com>
>

Thanks
Justin