linux-kernel - Re: [PATCH] x86, realmode: explicitly set ENTRY in linker script

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Date:   Tue, 24 Sep 2019 19:30:59 +0200
From:   Sedat Dilek <sedat.dilek@...il.com>
To:     Nick Desaulniers <ndesaulniers@...gle.com>
Cc:     tglx@...utronix.de, mingo@...hat.com, bp@...en8.de,
        Clang-Built-Linux ML <clang-built-linux@...glegroups.com>,
        "H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] x86, realmode: explicitly set ENTRY in linker script

On Tue, Sep 24, 2019 at 12:24 AM 'Nick Desaulniers' via Clang Built
Linux <clang-built-linux@...glegroups.com> wrote:
>
> Linking with ld.lld via $ make LD=ld.lld produces the warning:
> ld.lld: warning: cannot find entry symbol _start; defaulting to 0x1000
>
> Linking with ld.bfd shows the default entry is 0x1000:
> $ readelf -h arch/x86/realmode/rm/realmode.elf | grep Entry
>   Entry point address:               0x1000
>
> While ld.lld is being pedantic, just set the entry point explicitly,
> instead of depending on the implicit default.
>
> Link: https://github.com/ClangBuiltLinux/linux/issues/216

Reported-by: Sedat Dilek <sedat.dilek@...il.com> (seen on my first
steps when linking with LLD on x86-64)

> Signed-off-by: Nick Desaulniers <ndesaulniers@...gle.com>
> ---
>  arch/x86/realmode/rm/realmode.lds.S | 1 +
>  1 file changed, 1 insertion(+)
>
> diff --git a/arch/x86/realmode/rm/realmode.lds.S b/arch/x86/realmode/rm/realmode.lds.S
> index 3bb980800c58..2034f5f79bff 100644
> --- a/arch/x86/realmode/rm/realmode.lds.S
> +++ b/arch/x86/realmode/rm/realmode.lds.S
> @@ -11,6 +11,7 @@
>
>  OUTPUT_FORMAT("elf32-i386")
>  OUTPUT_ARCH(i386)
> +ENTRY(0x1000)
>
>  SECTIONS
>  {
> --
> 2.23.0.351.gc4317032e6-goog
>
> --
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