Re: [PATCH v4] MIPS: Truncate link address into 32bit for 32bit kernel

[Maciej W. Rozycki]

On Mon, 13 Apr 2020, Jiaxun Yang wrote:

> LLD failed to link vmlinux with 64bit load address for 32bit ELF
> while bfd will strip 64bit address into 32bit silently.
> To fix LLD build, we should truncate load address provided by platform
> into 32bit for 32bit kernel.

Reviewed-by: Maciej W. Rozycki <macro@xxxxxxxxxxxxxx>

> diff --git a/arch/mips/kernel/vmlinux.lds.S b/arch/mips/kernel/vmlinux.lds.S
> index a5f00ec73ea6..5226cd8e4bee 100644
> --- a/arch/mips/kernel/vmlinux.lds.S
> +++ b/arch/mips/kernel/vmlinux.lds.S
> @@ -55,7 +55,7 @@ SECTIONS
>  	/* . = 0xa800000000300000; */
>  	. = 0xffffffff80300000;
>  #endif
> -	. = VMLINUX_LOAD_ADDRESS;
> +	. = VMLINUX_LINK_ADDRESS;

 The CONFIG_BOOT_ELF64 cruft right above it looks interesting to me, never 
have ever been used.  We have had the current arrangement since:

commit 923ec3d20eef9e36456868b590873ce39f17fe71
Author: Ralf Baechle <ralf@xxxxxxxxxxxxxx>
Date:   Wed Nov 6 22:16:38 2002 +0000

    Define load address in linker script instead of relying on the
    deprecated and notoriously unreliable option -Ttext.

and previously `-Ttext' was used with this script anyway, though not very 
long, as the script was entirely ignored until:

commit 7a782968041ffc4c2d89816238e2f8ea5cceddba
Author: Ralf Baechle <ralf@xxxxxxxxxxxxxx>
Date:   Thu Oct 31 23:54:21 2002 +0000

    Merge with Linux 2.5.36.

  Maciej