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authorNicolas Pitre <nico@cam.org>2006-01-14 16:18:08 +0000
committerRussell King <rmk+kernel@arm.linux.org.uk>2006-01-14 16:18:08 +0000
commit2dede2d8e925f4c2cb4e136b14df127685e15dd3 (patch)
tree271b3fb300c5ac143556295d10c6736430ebed85 /include
parentda2b1cd61903c8e9796e76be2d606584f26a78e5 (diff)
downloadlinux-2.6.34-ux500-2dede2d8e925f4c2cb4e136b14df127685e15dd3.tar.gz
[ARM] 3102/1: ARM EABI: stack pointer must be 64-bit aligned after a CPU exception
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>
Diffstat (limited to 'include')
-rw-r--r--include/asm-arm/ptrace.h8
1 files changed, 5 insertions, 3 deletions
diff --git a/include/asm-arm/ptrace.h b/include/asm-arm/ptrace.h
index 4377e22b7e1..f40948d5444 100644
--- a/include/asm-arm/ptrace.h
+++ b/include/asm-arm/ptrace.h
@@ -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];
};