Dear Albert ARIBAUD,
In message <4ce0221a.7030...@free.fr> you wrote:
>
> Alright, then I think we should document how we comply, or do not
> comply, with GNU EABI / AAPCS (maybe a README.arm that people could read
> up) -- and I think if there is a way to access GD both before and after
> relocation without making a register unavailable to the whole u-boot
> code, then we should use it.
By the way - it should be not difficult to use a normal extern pointer
to reference the global data; see
"arch/powerpc/include/asm/global_data.h":
194 #if 1
195 #define DECLARE_GLOBAL_DATA_PTR register volatile gd_t *gd asm ("r2")
196 #else /* We could use plain global data, but the resulting code is bigger */
197 #define XTRN_DECLARE_GLOBAL_DATA_PTR extern
198 #define DECLARE_GLOBAL_DATA_PTR XTRN_DECLARE_GLOBAL_DATA_PTR \
199 gd_t *gd
200 #endif
When I implemented this code I tested both versions. There is not
much of a difference, except that the register based version results
in smaller code.
Best regards,
Wolfgang Denk
--
DENX Software Engineering GmbH, MD: Wolfgang Denk & Detlev Zundel
HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany
Phone: (+49)-8142-66989-10 Fax: (+49)-8142-66989-80 Email: w...@denx.de
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mand attack while you sit and watch for weakness.
-- Khan Noonian Singh, "Space Seed", stardate 3141.9
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