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x86: signal: intrroduce get_sigframe() and replace get_sigstack()

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Impact: cleanup

Introduce get_sigframe() like 32-bit to replace get_sigstack().
Move the i387 stuff into get_sigframe().

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 10:28:48 -08:00 committed by Ingo Molnar
parent 144b0712dd
commit 97286a2b64
1 changed files with 19 additions and 13 deletions
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32
arch/x86/kernel/signal.c
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@ -392,10 +392,13 @@ static int __setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
* Determine which stack to use..
*/
static void __user *
get_stack(struct k_sigaction *ka, unsigned long sp, unsigned long size)
get_sigframe(struct k_sigaction *ka, struct pt_regs *regs, size_t frame_size,
void __user **fpstate)
{
/* Default to using normal stack - redzone*/
sp -= 128;
unsigned long sp;
/* Default to using normal stack - redzone */
sp = regs->sp - 128;
/* This is the X/Open sanctioned signal stack switching. */
if (ka->sa.sa_flags & SA_ONSTACK) {
@ -403,7 +406,18 @@ get_stack(struct k_sigaction *ka, unsigned long sp, unsigned long size)
sp = current->sas_ss_sp + current->sas_ss_size;
}
return (void __user *)round_down(sp - size, 64);
if (used_math()) {
sp -= sig_xstate_size;
*fpstate = (void __user *)round_down(sp, 64);
if (save_i387_xstate(*fpstate) < 0)
return (void __user *) -1L;
sp -= frame_size;
return (void __user *)round_down(sp, 16) - 8;
}
sp -= frame_size;
return (void __user *)round_down(sp, 64) - 8;
}
static int __setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
@ -414,15 +428,7 @@ static int __setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
int err = 0;
struct task_struct *me = current;
if (used_math()) {
fp = get_stack(ka, regs->sp, sig_xstate_size);
frame = (void __user *)round_down(
(unsigned long)fp - sizeof(struct rt_sigframe), 16) - 8;
if (save_i387_xstate(fp) < 0)
return -EFAULT;
} else
frame = get_stack(ka, regs->sp, sizeof(struct rt_sigframe)) - 8;
frame = get_sigframe(ka, regs, sizeof(struct rt_sigframe), &fp);
if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
return -EFAULT;