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README: update ARM register usage

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Besides the change of this patchset it also updates the
README to reflect that GOT-generated relocations are no
longer supported on ARM.

cc: Albert ARIBAUD <albert.u.boot@aribaud.net>
Signed-off-by: Jeroen Hofstee <jeroen@myspectrum.nl>
This commit is contained in:
Jeroen Hofstee 2013-09-21 14:04:42 +02:00 • committed by Albert ARIBAUD
parent fe1378a961
commit 12eba1b493
1 changed files with 5 additions and 3 deletions
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8
README
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@ -5587,15 +5587,17 @@ On ARM, the following registers are used:
R0: function argument word/integer result
R1-R3: function argument word
R9: GOT pointer
R10: stack limit (used only if stack checking if enabled)
R9: platform specific
R10: stack limit (used only if stack checking is enabled)
R11: argument (frame) pointer
R12: temporary workspace
R13: stack pointer
R14: link register
R15: program counter
==> U-Boot will use R8 to hold a pointer to the global data
==> U-Boot will use R9 to hold a pointer to the global data
Note: on ARM, only R_ARM_RELATIVE relocations are supported.
On Nios II, the ABI is documented here:
http://www.altera.com/literature/hb/nios2/n2cpu_nii51016.pdf