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ARM: 6502/1: Thumb-2: Fix CONFIG_THUMB2_KERNEL breakage in compressed/head.S

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Some instruction operand combinations are used here which are nor
permitted in Thumb-2.

In particular, most uses of pc as an operand are disallowed in
Thumb-2, and deprecated in ARM from ARMv7 onwards.

The modified code introduced by this patch should be compatible
with all architecture versions >= v3, with or without
CONFIG_THUMB2_KERNEL.

Reviewed-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Dave Martin <dave.martin@linaro.org>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Acked-by: Nicolas Pitre <nicolas.pitre@linaro.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Dave Martin 2010-11-29 19:43:26 +01:00 committed by Russell King
parent 6323875db2
commit bfa64c4ab1
1 changed files with 4 additions and 2 deletions
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6
arch/arm/boot/compressed/head.S
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@ -174,7 +174,8 @@ not_angel:
ldr sp, [r0, #28]
#ifdef CONFIG_AUTO_ZRELADDR
@ determine final kernel image address
and r4, pc, #0xf8000000
mov r4, pc
and r4, r4, #0xf8000000
add r4, r4, #TEXT_OFFSET
#else
ldr r4, =zreladdr
@ -445,7 +446,8 @@ __setup_mmu: sub r3, r4, #16384 @ Page directory size
*/
mov r1, #0x1e
orr r1, r1, #3 << 10
mov r2, pc, lsr #20
mov r2, pc
mov r2, r2, lsr #20
orr r1, r1, r2, lsl #20
add r0, r3, r2, lsl #2
str r1, [r0], #4