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ARM: 6961/1: zImage: Add build-time check for correctly-sized proc_type entries

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It is easy to mis-maintain the proc_types table such that the
entries become wrongly-sized and misaligned when the kernel is
built in Thumb-2.

This patch adds an assembly-time check which will turn most common
size/alignment mistakes in this table into build failures, to avoid
having to debug the boot-time kernel hang which would happen if the
resulting kernel were actually booted.

Signed-off-by: Dave Martin <dave.martin@linaro.org>
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 2011-06-14 14:20:44 +01:00 committed by Russell King
parent 573619d165
commit 946a105e16
1 changed files with 13 additions and 1 deletions
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14
arch/arm/boot/compressed/head.S
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@ -597,6 +597,8 @@ __common_mmu_cache_on:
sub pc, lr, r0, lsr #32 @ properly flush pipeline
#endif
#define PROC_ENTRY_SIZE (4*5)
/*
* Here follow the relocatable cache support functions for the
* various processors. This is a generic hook for locating an
@ -624,7 +626,7 @@ call_cache_fn: adr r12, proc_types
ARM( addeq pc, r12, r3 ) @ call cache function
THUMB( addeq r12, r3 )
THUMB( moveq pc, r12 ) @ call cache function
add r12, r12, #4*5
add r12, r12, #PROC_ENTRY_SIZE
b 1b
/*
@ -794,6 +796,16 @@ proc_types:
.size proc_types, . - proc_types
/*
* If you get a "non-constant expression in ".if" statement"
* error from the assembler on this line, check that you have
* not accidentally written a "b" instruction where you should
* have written W(b).
*/
.if (. - proc_types) % PROC_ENTRY_SIZE != 0
.error "The size of one or more proc_types entries is wrong."
.endif
/*
* Turn off the Cache and MMU. ARMv3 does not support
* reading the control register, but ARMv4 does.