[ARM] 3102/1: ARM EABI: stack pointer must be 64-bit aligned after a CPU exception

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Patch from Nicolas Pitre

The ARM EABI says that the stack pointer has to be 64-bit aligned for
reasons already mentioned in patch #3101 when calling C functions.

We therefore must verify and adjust sp accordingly when taking an
exception from kernel mode since sp might not necessarily be 64-bit
aligned if the exception occurs in the middle of a kernel function.

If the exception occurs while in user mode then no sp fixup is needed as
long as sizeof(struct pt_regs) as well as any additional syscall data
stack space remain multiples of 8.

Signed-off-by: Nicolas Pitre <nico@cam.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

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This commit is contained in:

Nicolas Pitre 2006-01-14 16:18:08 +00:00 • committed by Russell King

parent da2b1cd619

commit 2dede2d8e9

3 changed files with 23 additions and 3 deletions

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17

arch/arm/kernel/entry-armv.S

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1

arch/arm/kernel/entry-header.S

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8

include/asm-arm/ptrace.h

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