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| author | Jeroen Hofstee <jeroen@myspectrum.nl> | 2013-09-21 14:04:42 +0200 |
|---|---|---|
| committer | Albert ARIBAUD <albert.u.boot@aribaud.net> | 2013-09-23 18:00:36 +0200 |
| commit | 12eba1b49380988fd87cc0b3af44014cca8b71c4 (patch) | |
| tree | 430dd60722cb8f14b1b4fb95196a167f6bb570db | |
| parent | fe1378a961e508b31b1f29a2bb08ba1dac063155 (diff) | |
| download | u-boot-imx-12eba1b49380988fd87cc0b3af44014cca8b71c4.zip u-boot-imx-12eba1b49380988fd87cc0b3af44014cca8b71c4.tar.gz u-boot-imx-12eba1b49380988fd87cc0b3af44014cca8b71c4.tar.bz2 | |
README: update ARM register usage
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>
| -rw-r--r-- | README | 8 |
1 files changed, 5 insertions, 3 deletions
@@ -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 |