linux-kernel - Re: [PATCH v5 2/3] scripts/faddr2line: Use LLVM addr2line and readelf if LLVM=1

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Message-ID: <CAKwvOdmLey43Ng5p7bD2arUY6T=B+y=K-Lo-Qbya540ZUJXU4Q@mail.gmail.com>
Date:   Mon, 2 Oct 2023 10:00:58 -0700
From:   Nick Desaulniers <ndesaulniers@...gle.com>
To:     Will Deacon <will@...nel.org>
Cc:     linux-kernel@...r.kernel.org, kernel-team@...roid.com,
        Masahiro Yamada <masahiroy@...nel.org>,
        Nathan Chancellor <nathan@...nel.org>,
        Nicolas Schier <nicolas@...sle.eu>,
        Josh Poimboeuf <jpoimboe@...nel.org>,
        John Stultz <jstultz@...gle.com>, linux-kbuild@...r.kernel.org
Subject: Re: [PATCH v5 2/3] scripts/faddr2line: Use LLVM addr2line and readelf
 if LLVM=1

On Mon, Oct 2, 2023 at 9:58 AM Will Deacon <will@...nel.org> wrote:
>
> GNU utilities cannot necessarily parse objects built by LLVM, which can
> result in confusing errors when using 'faddr2line':
>
> $ CROSS_COMPILE=aarch64-linux-gnu- ./scripts/faddr2line vmlinux do_one_initcall+0xf4/0x260
> aarch64-linux-gnu-addr2line: vmlinux: unknown type [0x13] section `.relr.dyn'
> aarch64-linux-gnu-addr2line: DWARF error: invalid or unhandled FORM value: 0x25
> do_one_initcall+0xf4/0x260:
> aarch64-linux-gnu-addr2line: vmlinux: unknown type [0x13] section `.relr.dyn'
> aarch64-linux-gnu-addr2line: DWARF error: invalid or unhandled FORM value: 0x25
> $x.73 at main.c:?
>
> Although this can be worked around by setting CROSS_COMPILE to "llvm=-",
> it's cleaner to follow the same syntax as the top-level Makefile and
> accept LLVM= as an indication to use the llvm- tools, optionally
> specifying their location or specific version number.
>
> Cc: Josh Poimboeuf <jpoimboe@...nel.org>
> Cc: John Stultz <jstultz@...gle.com>
> Suggested-by: Masahiro Yamada <masahiroy@...nel.org>
> Signed-off-by: Will Deacon <will@...nel.org>

Thanks for the patch!
Reviewed-by: Nick Desaulniers <ndesaulniers@...gle.com>

> ---
>  scripts/faddr2line | 17 +++++++++++++++--
>  1 file changed, 15 insertions(+), 2 deletions(-)
>
> diff --git a/scripts/faddr2line b/scripts/faddr2line
> index a35a420d0f26..6b8206802157 100755
> --- a/scripts/faddr2line
> +++ b/scripts/faddr2line
> @@ -58,8 +58,21 @@ die() {
>         exit 1
>  }
>
> -READELF="${CROSS_COMPILE:-}readelf"
> -ADDR2LINE="${CROSS_COMPILE:-}addr2line"
> +UTIL_SUFFIX=""
> +if [[ "${LLVM:-}" == "" ]]; then
> +       UTIL_PREFIX=${CROSS_COMPILE:-}
> +else
> +       UTIL_PREFIX=llvm-
> +
> +       if [[ "${LLVM}" == *"/" ]]; then
> +               UTIL_PREFIX=${LLVM}${UTIL_PREFIX}
> +       elif [[ "${LLVM}" == "-"* ]]; then
> +               UTIL_SUFFIX=${LLVM}
> +       fi
> +fi
> +
> +READELF="${UTIL_PREFIX}readelf${UTIL_SUFFIX}"
> +ADDR2LINE="${UTIL_PREFIX}addr2line${UTIL_SUFFIX}"
>  AWK="awk"
>  GREP="grep"
>
> --
> 2.42.0.582.g8ccd20d70d-goog
>


-- 
Thanks,
~Nick Desaulniers