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[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>
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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include/asm-arm/ptrace.h
+5 -3
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@@ -60,9 +60,11 @@
#ifndef __ASSEMBLY__
/* this struct defines the way the registers are stored on the
stack during a system call. */
/*
* This struct defines the way the registers are stored on the
* stack during a system call. Note that sizeof(struct pt_regs)
* has to be a multiple of 8.
*/
struct pt_regs {
long uregs[18];
};