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Commit 97286a2b authored by Hiroshi Shimamoto's avatar Hiroshi Shimamoto Committed by Ingo Molnar
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x86: signal: intrroduce get_sigframe() and replace get_sigstack() 



Impact: cleanup

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

Signed-off-by: default avatarHiroshi Shimamoto <h-shimamoto@ct.jp.nec.com>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent 144b0712

arch/x86/kernel/signal.c

+19 −13
Original line number Diff line number Diff line
@@ -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)

{

	unsigned long sp;



	/* Default to using normal stack - redzone */

	sp -= 128;

	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;