diff options
| author | Nicolas Pitre <nico@cam.org> | 2006-01-14 16:18:08 +0000 |
|---|---|---|
| committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2006-01-14 16:18:08 +0000 |
| commit | 2dede2d8e925f4c2cb4e136b14df127685e15dd3 (patch) | |
| tree | 271b3fb300c5ac143556295d10c6736430ebed85 /include/asm-arm | |
| parent | da2b1cd61903c8e9796e76be2d606584f26a78e5 (diff) | |
[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/asm-arm')
| -rw-r--r-- | include/asm-arm/ptrace.h | 8 |
1 files changed, 5 insertions, 3 deletions
diff --git a/include/asm-arm/ptrace.h b/include/asm-arm/ptrace.h index 4377e22b7e1a..f40948d54448 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]; }; |