ARM: 6504/1: Thumb-2: Fix long-distance conditional branches in head.S for Thumb-2.

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The 32-bit conditional branches in Thumb-2 have a shorter range
(+/-512K) than their ARM counterparts (+/-32MB).  The linker does
not currently generate trampolines to extend the range of these
Thumb-2 conditional branches, resulting in link errors when vmlinux
is sufficiently large, e.g.:

head.o:(.text+0x464): relocation truncated to fit: R_ARM_THM_JUMP19

This patch forces the longer-range, unconditional branch encoding
by use of an explicit IT instruction.  The resulting branches are
triggered on the same conditions as before.

Signed-off-by: Dave Martin <dave.martin@linaro.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

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Dave Martin 2010-11-29 19:43:28 +01:00 • committed by Russell King

parent 26e5ca93dd

commit a75e5248c5

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arch/arm/kernel/head.S

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