diff options
| author | Hiroshi Shimamoto | 2009-02-27 10:30:32 -0800 |
|---|---|---|
| committer | Ingo Molnar | 2009-02-28 09:17:31 +0100 |
| commit | 1fae0279ce4811fa123001515d1ed3d68c1d557f (patch) | |
| tree | 80a64b1abf0d9c5aae7e1e6c57a70c425fb8c0d6 | |
| parent | 75779f05264b9968d7ae7ecb4ca5127b08785692 (diff) | |
x86: signal: introduce helper align_sigframe()
Impact: cleanup
Introduce helper align_sigframe() to align stack pointer for signal frame.
Signed-off-by: Hiroshi Shimamoto <h-shimamoto@ct.jp.nec.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
| -rw-r--r-- | arch/x86/kernel/signal.c | 27 |
1 files changed, 15 insertions, 12 deletions
diff --git a/arch/x86/kernel/signal.c b/arch/x86/kernel/signal.c index 53425c681f2b..dde3f2ae2371 100644 --- a/arch/x86/kernel/signal.c +++ b/arch/x86/kernel/signal.c @@ -191,6 +191,20 @@ setup_sigcontext(struct sigcontext __user *sc, void __user *fpstate, /* * Determine which stack to use.. */ +static unsigned long align_sigframe(unsigned long sp) +{ +#ifdef CONFIG_X86_32 + /* + * Align the stack pointer according to the i386 ABI, + * i.e. so that on function entry ((sp + 4) & 15) == 0. + */ + sp = ((sp + 4) & -16ul) - 4; +#else /* !CONFIG_X86_32 */ + sp = round_down(sp, 16) - 8; +#endif + return sp; +} + static inline void __user * get_sigframe(struct k_sigaction *ka, struct pt_regs *regs, size_t frame_size, void __user **fpstate) @@ -236,18 +250,7 @@ get_sigframe(struct k_sigaction *ka, struct pt_regs *regs, size_t frame_size, return (void __user *)-1L; } - sp -= frame_size; -#ifdef CONFIG_X86_32 - /* - * Align the stack pointer according to the i386 ABI, - * i.e. so that on function entry ((sp + 4) & 15) == 0. - */ - sp = ((sp + 4) & -16ul) - 4; -#else /* !CONFIG_X86_32 */ - sp = round_down(sp, 16) - 8; -#endif - - return (void __user *) sp; + return (void __user *)align_sigframe(sp - frame_size); } #ifdef CONFIG_X86_32 |