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authorSimon Kagstrom <simon.kagstrom@netinsight.net>2009-10-06 08:44:22 +0200
committerTom Rix <Tom.Rix@windriver.com>2009-10-24 09:55:25 -0500
commit8003c361deec3ee651451662efd05352f1abdd40 (patch)
tree00cb74e53916da716b68fce2c65e83d4a15b29dd /cpu/arm926ejs
parente63e5904b48528f3f3cc98317df6fc62fab25bf9 (diff)
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arm926ejs: 8-byte align stack to avoid LDRD/STRD problems
U-boot for Marvell Kirkwood boards no longer work after the EABI changes introduced in commit f772acf8a584067033eff1e231fcd1fb3a00d3d9. This turns out to be caused by a stack alignment issue. The armv5te instructions ldrd/strd instructions require 8-byte alignment to work properly (otherwise undefined behavior). Tested on an OpenRD base board, where both printouts and ubifs stuff now works. Signed-off-by: Simon Kagstrom <simon.kagstrom@netinsight.net>
Diffstat (limited to 'cpu/arm926ejs')
-rw-r--r--cpu/arm926ejs/start.S1
1 files changed, 1 insertions, 0 deletions
diff --git a/cpu/arm926ejs/start.S b/cpu/arm926ejs/start.S
index 8043322..4421b6a 100644
--- a/cpu/arm926ejs/start.S
+++ b/cpu/arm926ejs/start.S
@@ -172,6 +172,7 @@ stack_setup:
sub r0, r0, #(CONFIG_STACKSIZE_IRQ+CONFIG_STACKSIZE_FIQ)
#endif
sub sp, r0, #12 /* leave 3 words for abort-stack */
+ bic sp, r0, #7 /* 8-byte align stack for ABI compliance */
clear_bss:
ldr r0, _bss_start /* find start of bss segment */