[U-Boot] [PATCH] mpc83xx: Add -fpic relocation support

[Wolfgang Denk]

Dear Joakim Tjernlund,

In message <1286887081-23172-1-git-send-email-Joakim.Tjernlund at transmode.se> you wrote:
> This add relocation of .got entries produced
> by -fpic. -fpic produces 2-3% smaller code and
> is faster. Unfortunately gcc promotes -fpic to
> -fPIC when -mrelocatable is used so one need a very
> small patch to gcc too(sent upstream).

What happens when one uses this patch in combination with a "standard"
(i. e. older, unpatched) GCC?

>  	START_GOT
>  	GOT_ENTRY(_GOT2_TABLE_)
> +	GOT_ENTRY(_GOT_TABLE_)
> +	GOT_ENTRY(_GLOBAL_OFFSET_TABLE_)
>  	GOT_ENTRY(__bss_start)
>  	GOT_ENTRY(_end)
>  
> @@ -951,6 +953,22 @@ in_ram:
>  	stw	r0,0(r3)
>  2:	bdnz	1b
>  
> +	lwz	r4,GOT(_GLOBAL_OFFSET_TABLE_)

What exactly is _GLOBAL_OFFSET_TABLE_ good for, and how does it differ
from _GOT_TABLE_ ?

Best regards,

Wolfgang Denk

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