lk/linux-kernel-test
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

x86: signal: introduce helper align_sigframe()

Browse Source 
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>
This commit is contained in:
Hiroshi Shimamoto
2009-02-27 10:30:32 -08:00
committed by Ingo Molnar
parent 75779f0526
commit 1fae0279ce
1 changed files with 15 additions and 12 deletions
Download Patch File Download Diff File Expand all files Collapse all files

27
arch/x86/kernel/signal.c
View File

@@ -191,6 +191,20 @@ setup_sigcontext(struct sigcontext __user *sc, void __user *fpstate,
/* /*
* Determine which stack to use.. * 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 * static inline void __user *
get_sigframe(struct k_sigaction *ka, struct pt_regs *regs, size_t frame_size, get_sigframe(struct k_sigaction *ka, struct pt_regs *regs, size_t frame_size,
void __user **fpstate) 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; return (void __user *)-1L;
} }
sp -= frame_size; return (void __user *)align_sigframe(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;
} }
#ifdef CONFIG_X86_32 #ifdef CONFIG_X86_32