1 files changed, 148 insertions, 260 deletions

diff --git a/arch/x86/kernel/signal.c b/arch/x86/kernel/signal.c
index 21af737053a..2851d63c120 100644
--- a/arch/x86/kernel/signal.c
+++ b/arch/x86/kernel/signal.c
@@ -6,6 +6,9 @@
  *  2000-06-20  Pentium III FXSR, SSE support by Gareth Hughes
  *  2000-2002   x86-64 support by Andi Kleen
  */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
 #include <linux/sched.h>
 #include <linux/mm.h>
 #include <linux/smp.h>
@@ -19,6 +22,7 @@
 #include <linux/uaccess.h>
 #include <linux/user-return-notifier.h>
 #include <linux/uprobes.h>
+#include <linux/context_tracking.h>
 
 #include <asm/processor.h>
 #include <asm/ucontext.h>
@@ -39,12 +43,6 @@
 
 #include <asm/sigframe.h>
 
-#ifdef CONFIG_X86_32
-# define FIX_EFLAGS	(__FIX_EFLAGS | X86_EFLAGS_RF)
-#else
-# define FIX_EFLAGS	__FIX_EFLAGS
-#endif
-
 #define COPY(x)			do {			\
 	get_user_ex(regs->x, &sc->x);			\
 } while (0)
@@ -111,11 +109,12 @@ int restore_sigcontext(struct pt_regs *regs, struct sigcontext __user *sc,
 		regs->orig_ax = -1;		/* disable syscall checks */
 
 		get_user_ex(buf, &sc->fpstate);
-		err |= restore_i387_xstate(buf);
 
 		get_user_ex(*pax, &sc->ax);
 	} get_user_catch(err);
 
+	err |= restore_xstate_sig(buf, config_enabled(CONFIG_X86_32));
+
 	return err;
 }
 
@@ -203,35 +202,32 @@ get_sigframe(struct k_sigaction *ka, struct pt_regs *regs, size_t frame_size,
 	     void __user **fpstate)
 {
 	/* Default to using normal stack */
+	unsigned long math_size = 0;
 	unsigned long sp = regs->sp;
+	unsigned long buf_fx = 0;
 	int onsigstack = on_sig_stack(sp);
 
-#ifdef CONFIG_X86_64
 	/* redzone */
-	sp -= 128;
-#endif /* CONFIG_X86_64 */
+	if (config_enabled(CONFIG_X86_64))
+		sp -= 128;
 
 	if (!onsigstack) {
 		/* This is the X/Open sanctioned signal stack switching.  */
 		if (ka->sa.sa_flags & SA_ONSTACK) {
 			if (current->sas_ss_size)
 				sp = current->sas_ss_sp + current->sas_ss_size;
-		} else {
-#ifdef CONFIG_X86_32
-			/* This is the legacy signal stack switching. */
-			if ((regs->ss & 0xffff) != __USER_DS &&
-				!(ka->sa.sa_flags & SA_RESTORER) &&
-					ka->sa.sa_restorer)
+		} else if (config_enabled(CONFIG_X86_32) &&
+			   (regs->ss & 0xffff) != __USER_DS &&
+			   !(ka->sa.sa_flags & SA_RESTORER) &&
+			   ka->sa.sa_restorer) {
+				/* This is the legacy signal stack switching. */
 				sp = (unsigned long) ka->sa.sa_restorer;
-#endif /* CONFIG_X86_32 */
 		}
 	}
 
 	if (used_math()) {
-		sp -= sig_xstate_size;
-#ifdef CONFIG_X86_64
-		sp = round_down(sp, 64);
-#endif /* CONFIG_X86_64 */
+		sp = alloc_mathframe(sp, config_enabled(CONFIG_X86_32),
+				     &buf_fx, &math_size);
 		*fpstate = (void __user *)sp;
 	}
 
@@ -244,8 +240,9 @@ get_sigframe(struct k_sigaction *ka, struct pt_regs *regs, size_t frame_size,
 	if (onsigstack && !likely(on_sig_stack(sp)))
 		return (void __user *)-1L;
 
-	/* save i387 state */
-	if (used_math() && save_i387_xstate(*fpstate) < 0)
+	/* save i387 and extended state */
+	if (used_math() &&
+	    save_xstate_sig(*fpstate, (void __user *)buf_fx, math_size) < 0)
 		return (void __user *)-1L;
 
 	return (void __user *)sp;
@@ -275,7 +272,7 @@ static const struct {
 };
 
 static int
-__setup_frame(int sig, struct k_sigaction *ka, sigset_t *set,
+__setup_frame(int sig, struct ksignal *ksig, sigset_t *set,
 	      struct pt_regs *regs)
 {
 	struct sigframe __user *frame;
@@ -283,7 +280,7 @@ __setup_frame(int sig, struct k_sigaction *ka, sigset_t *set,
 	int err = 0;
 	void __user *fpstate = NULL;
 
-	frame = get_sigframe(ka, regs, sizeof(*frame), &fpstate);
+	frame = get_sigframe(&ksig->ka, regs, sizeof(*frame), &fpstate);
 
 	if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
 		return -EFAULT;
@@ -301,11 +298,12 @@ __setup_frame(int sig, struct k_sigaction *ka, sigset_t *set,
 	}
 
 	if (current->mm->context.vdso)
-		restorer = VDSO32_SYMBOL(current->mm->context.vdso, sigreturn);
+		restorer = current->mm->context.vdso +
+			selected_vdso32->sym___kernel_sigreturn;
 	else
 		restorer = &frame->retcode;
-	if (ka->sa.sa_flags & SA_RESTORER)
-		restorer = ka->sa.sa_restorer;
+	if (ksig->ka.sa.sa_flags & SA_RESTORER)
+		restorer = ksig->ka.sa.sa_restorer;
 
 	/* Set up to return from userspace.  */
 	err |= __put_user(restorer, &frame->pretcode);
@@ -324,7 +322,7 @@ __setup_frame(int sig, struct k_sigaction *ka, sigset_t *set,
 
 	/* Set up registers for signal handler */
 	regs->sp = (unsigned long)frame;
-	regs->ip = (unsigned long)ka->sa.sa_handler;
+	regs->ip = (unsigned long)ksig->ka.sa.sa_handler;
 	regs->ax = (unsigned long)sig;
 	regs->dx = 0;
 	regs->cx = 0;
@@ -337,7 +335,7 @@ __setup_frame(int sig, struct k_sigaction *ka, sigset_t *set,
 	return 0;
 }
 
-static int __setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
+static int __setup_rt_frame(int sig, struct ksignal *ksig,
 			    sigset_t *set, struct pt_regs *regs)
 {
 	struct rt_sigframe __user *frame;
@@ -345,7 +343,7 @@ static int __setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
 	int err = 0;
 	void __user *fpstate = NULL;
 
-	frame = get_sigframe(ka, regs, sizeof(*frame), &fpstate);
+	frame = get_sigframe(&ksig->ka, regs, sizeof(*frame), &fpstate);
 
 	if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
 		return -EFAULT;
@@ -354,7 +352,6 @@ static int __setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
 		put_user_ex(sig, &frame->sig);
 		put_user_ex(&frame->info, &frame->pinfo);
 		put_user_ex(&frame->uc, &frame->puc);
-		err |= copy_siginfo_to_user(&frame->info, info);
 
 		/* Create the ucontext.  */
 		if (cpu_has_xsave)
@@ -362,18 +359,13 @@ static int __setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
 		else
 			put_user_ex(0, &frame->uc.uc_flags);
 		put_user_ex(0, &frame->uc.uc_link);
-		put_user_ex(current->sas_ss_sp, &frame->uc.uc_stack.ss_sp);
-		put_user_ex(sas_ss_flags(regs->sp),
-			    &frame->uc.uc_stack.ss_flags);
-		put_user_ex(current->sas_ss_size, &frame->uc.uc_stack.ss_size);
-		err |= setup_sigcontext(&frame->uc.uc_mcontext, fpstate,
-					regs, set->sig[0]);
-		err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
+		save_altstack_ex(&frame->uc.uc_stack, regs->sp);
 
 		/* Set up to return from userspace.  */
-		restorer = VDSO32_SYMBOL(current->mm->context.vdso, rt_sigreturn);
-		if (ka->sa.sa_flags & SA_RESTORER)
-			restorer = ka->sa.sa_restorer;
+		restorer = current->mm->context.vdso +
+			selected_vdso32->sym___kernel_rt_sigreturn;
+		if (ksig->ka.sa.sa_flags & SA_RESTORER)
+			restorer = ksig->ka.sa.sa_restorer;
 		put_user_ex(restorer, &frame->pretcode);
 
 		/*
@@ -385,13 +377,18 @@ static int __setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
 		 */
 		put_user_ex(*((u64 *)&rt_retcode), (u64 *)frame->retcode);
 	} put_user_catch(err);
+	
+	err |= copy_siginfo_to_user(&frame->info, &ksig->info);
+	err |= setup_sigcontext(&frame->uc.uc_mcontext, fpstate,
+				regs, set->sig[0]);
+	err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
 
 	if (err)
 		return -EFAULT;
 
 	/* Set up registers for signal handler */
 	regs->sp = (unsigned long)frame;
-	regs->ip = (unsigned long)ka->sa.sa_handler;
+	regs->ip = (unsigned long)ksig->ka.sa.sa_handler;
 	regs->ax = (unsigned long)sig;
 	regs->dx = (unsigned long)&frame->info;
 	regs->cx = (unsigned long)&frame->uc;
@@ -404,21 +401,20 @@ static int __setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
 	return 0;
 }
 #else /* !CONFIG_X86_32 */
-static int __setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
+static int __setup_rt_frame(int sig, struct ksignal *ksig,
 			    sigset_t *set, struct pt_regs *regs)
 {
 	struct rt_sigframe __user *frame;
 	void __user *fp = NULL;
 	int err = 0;
-	struct task_struct *me = current;
 
-	frame = get_sigframe(ka, regs, sizeof(struct rt_sigframe), &fp);
+	frame = get_sigframe(&ksig->ka, regs, sizeof(struct rt_sigframe), &fp);
 
 	if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
 		return -EFAULT;
 
-	if (ka->sa.sa_flags & SA_SIGINFO) {
-		if (copy_siginfo_to_user(&frame->info, info))
+	if (ksig->ka.sa.sa_flags & SA_SIGINFO) {
+		if (copy_siginfo_to_user(&frame->info, &ksig->info))
 			return -EFAULT;
 	}
 
@@ -429,24 +425,22 @@ static int __setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
 		else
 			put_user_ex(0, &frame->uc.uc_flags);
 		put_user_ex(0, &frame->uc.uc_link);
-		put_user_ex(me->sas_ss_sp, &frame->uc.uc_stack.ss_sp);
-		put_user_ex(sas_ss_flags(regs->sp),
-			    &frame->uc.uc_stack.ss_flags);
-		put_user_ex(me->sas_ss_size, &frame->uc.uc_stack.ss_size);
-		err |= setup_sigcontext(&frame->uc.uc_mcontext, fp, regs, set->sig[0]);
-		err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
+		save_altstack_ex(&frame->uc.uc_stack, regs->sp);
 
 		/* Set up to return from userspace.  If provided, use a stub
 		   already in userspace.  */
 		/* x86-64 should always use SA_RESTORER. */
-		if (ka->sa.sa_flags & SA_RESTORER) {
-			put_user_ex(ka->sa.sa_restorer, &frame->pretcode);
+		if (ksig->ka.sa.sa_flags & SA_RESTORER) {
+			put_user_ex(ksig->ka.sa.sa_restorer, &frame->pretcode);
 		} else {
 			/* could use a vstub here */
 			err |= -EFAULT;
 		}
 	} put_user_catch(err);
 
+	err |= setup_sigcontext(&frame->uc.uc_mcontext, fp, regs, set->sig[0]);
+	err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
+
 	if (err)
 		return -EFAULT;
 
@@ -459,7 +453,7 @@ static int __setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
 	   next argument after the signal number on the stack. */
 	regs->si = (unsigned long)&frame->info;
 	regs->dx = (unsigned long)&frame->uc;
-	regs->ip = (unsigned long) ka->sa.sa_handler;
+	regs->ip = (unsigned long) ksig->ka.sa.sa_handler;
 
 	regs->sp = (unsigned long)frame;
 
@@ -471,77 +465,79 @@ static int __setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
 }
 #endif /* CONFIG_X86_32 */
 
-#ifdef CONFIG_X86_32
-/*
- * Atomically swap in the new signal mask, and wait for a signal.
- */
-asmlinkage int
-sys_sigsuspend(int history0, int history1, old_sigset_t mask)
+static int x32_setup_rt_frame(struct ksignal *ksig,
+			      compat_sigset_t *set,
+			      struct pt_regs *regs)
 {
-	sigset_t blocked;
-	siginitset(&blocked, mask);
-	return sigsuspend(&blocked);
-}
+#ifdef CONFIG_X86_X32_ABI
+	struct rt_sigframe_x32 __user *frame;
+	void __user *restorer;
+	int err = 0;
+	void __user *fpstate = NULL;
 
-asmlinkage int
-sys_sigaction(int sig, const struct old_sigaction __user *act,
-	      struct old_sigaction __user *oact)
-{
-	struct k_sigaction new_ka, old_ka;
-	int ret = 0;
+	frame = get_sigframe(&ksig->ka, regs, sizeof(*frame), &fpstate);
 
-	if (act) {
-		old_sigset_t mask;
+	if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
+		return -EFAULT;
 
-		if (!access_ok(VERIFY_READ, act, sizeof(*act)))
+	if (ksig->ka.sa.sa_flags & SA_SIGINFO) {
+		if (copy_siginfo_to_user32(&frame->info, &ksig->info))
 			return -EFAULT;
+	}
 
-		get_user_try {
-			get_user_ex(new_ka.sa.sa_handler, &act->sa_handler);
-			get_user_ex(new_ka.sa.sa_flags, &act->sa_flags);
-			get_user_ex(mask, &act->sa_mask);
-			get_user_ex(new_ka.sa.sa_restorer, &act->sa_restorer);
-		} get_user_catch(ret);
+	put_user_try {
+		/* Create the ucontext.  */
+		if (cpu_has_xsave)
+			put_user_ex(UC_FP_XSTATE, &frame->uc.uc_flags);
+		else
+			put_user_ex(0, &frame->uc.uc_flags);
+		put_user_ex(0, &frame->uc.uc_link);
+		compat_save_altstack_ex(&frame->uc.uc_stack, regs->sp);
+		put_user_ex(0, &frame->uc.uc__pad0);
 
-		if (ret)
-			return -EFAULT;
-		siginitset(&new_ka.sa.sa_mask, mask);
-	}
+		if (ksig->ka.sa.sa_flags & SA_RESTORER) {
+			restorer = ksig->ka.sa.sa_restorer;
+		} else {
+			/* could use a vstub here */
+			restorer = NULL;
+			err |= -EFAULT;
+		}
+		put_user_ex(restorer, &frame->pretcode);
+	} put_user_catch(err);
 
-	ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
+	err |= setup_sigcontext(&frame->uc.uc_mcontext, fpstate,
+				regs, set->sig[0]);
+	err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
 
-	if (!ret && oact) {
-		if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)))
-			return -EFAULT;
+	if (err)
+		return -EFAULT;
 
-		put_user_try {
-			put_user_ex(old_ka.sa.sa_handler, &oact->sa_handler);
-			put_user_ex(old_ka.sa.sa_flags, &oact->sa_flags);
-			put_user_ex(old_ka.sa.sa_mask.sig[0], &oact->sa_mask);
-			put_user_ex(old_ka.sa.sa_restorer, &oact->sa_restorer);
-		} put_user_catch(ret);
+	/* Set up registers for signal handler */
+	regs->sp = (unsigned long) frame;
+	regs->ip = (unsigned long) ksig->ka.sa.sa_handler;
 
-		if (ret)
-			return -EFAULT;
-	}
+	/* We use the x32 calling convention here... */
+	regs->di = ksig->sig;
+	regs->si = (unsigned long) &frame->info;
+	regs->dx = (unsigned long) &frame->uc;
 
-	return ret;
-}
-#endif /* CONFIG_X86_32 */
+	loadsegment(ds, __USER_DS);
+	loadsegment(es, __USER_DS);
 
-long
-sys_sigaltstack(const stack_t __user *uss, stack_t __user *uoss,
-		struct pt_regs *regs)
-{
-	return do_sigaltstack(uss, uoss, regs->sp);
+	regs->cs = __USER_CS;
+	regs->ss = __USER_DS;
+#endif	/* CONFIG_X86_X32_ABI */
+
+	return 0;
 }
 
 /*
  * Do a signal return; undo the signal stack.
  */
 #ifdef CONFIG_X86_32
-unsigned long sys_sigreturn(struct pt_regs *regs)
+asmlinkage unsigned long sys_sigreturn(void)
 {
+	struct pt_regs *regs = current_pt_regs();
 	struct sigframe __user *frame;
 	unsigned long ax;
 	sigset_t set;
@@ -568,8 +564,9 @@ badframe:
 }
 #endif /* CONFIG_X86_32 */
 
-long sys_rt_sigreturn(struct pt_regs *regs)
+asmlinkage long sys_rt_sigreturn(void)
 {
+	struct pt_regs *regs = current_pt_regs();
 	struct rt_sigframe __user *frame;
 	unsigned long ax;
 	sigset_t set;
@@ -585,7 +582,7 @@ long sys_rt_sigreturn(struct pt_regs *regs)
 	if (restore_sigcontext(regs, &frame->uc.uc_mcontext, &ax))
 		goto badframe;
 
-	if (do_sigaltstack(&frame->uc.uc_stack, NULL, regs->sp) == -EFAULT)
+	if (restore_altstack(&frame->uc.uc_stack))
 		goto badframe;
 
 	return ax;
@@ -609,64 +606,30 @@ static int signr_convert(int sig)
 	return sig;
 }
 
-#ifdef CONFIG_X86_32
-
-#define is_ia32	1
-#define ia32_setup_frame	__setup_frame
-#define ia32_setup_rt_frame	__setup_rt_frame
-
-#else /* !CONFIG_X86_32 */
-
-#ifdef CONFIG_IA32_EMULATION
-#define is_ia32	test_thread_flag(TIF_IA32)
-#else /* !CONFIG_IA32_EMULATION */
-#define is_ia32	0
-#endif /* CONFIG_IA32_EMULATION */
-
-#ifdef CONFIG_X86_X32_ABI
-#define is_x32	test_thread_flag(TIF_X32)
-
-static int x32_setup_rt_frame(int sig, struct k_sigaction *ka,
-			      siginfo_t *info, compat_sigset_t *set,
-			      struct pt_regs *regs);
-#else /* !CONFIG_X86_X32_ABI */
-#define is_x32	0
-#endif /* CONFIG_X86_X32_ABI */
-
-int ia32_setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
-		sigset_t *set, struct pt_regs *regs);
-int ia32_setup_frame(int sig, struct k_sigaction *ka,
-		sigset_t *set, struct pt_regs *regs);
-
-#endif /* CONFIG_X86_32 */
-
 static int
-setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
-		struct pt_regs *regs)
+setup_rt_frame(struct ksignal *ksig, struct pt_regs *regs)
 {
-	int usig = signr_convert(sig);
+	int usig = signr_convert(ksig->sig);
 	sigset_t *set = sigmask_to_save();
+	compat_sigset_t *cset = (compat_sigset_t *) set;
 
 	/* Set up the stack frame */
-	if (is_ia32) {
-		if (ka->sa.sa_flags & SA_SIGINFO)
-			return ia32_setup_rt_frame(usig, ka, info, set, regs);
+	if (is_ia32_frame()) {
+		if (ksig->ka.sa.sa_flags & SA_SIGINFO)
+			return ia32_setup_rt_frame(usig, ksig, cset, regs);
 		else
-			return ia32_setup_frame(usig, ka, set, regs);
-#ifdef CONFIG_X86_X32_ABI
-	} else if (is_x32) {
-		return x32_setup_rt_frame(usig, ka, info,
-					 (compat_sigset_t *)set, regs);
-#endif
+			return ia32_setup_frame(usig, ksig, cset, regs);
+	} else if (is_x32_frame()) {
+		return x32_setup_rt_frame(ksig, cset, regs);
 	} else {
-		return __setup_rt_frame(sig, ka, info, set, regs);
+		return __setup_rt_frame(ksig->sig, ksig, set, regs);
 	}
 }
 
 static void
-handle_signal(unsigned long sig, siginfo_t *info, struct k_sigaction *ka,
-		struct pt_regs *regs)
+handle_signal(struct ksignal *ksig, struct pt_regs *regs)
 {
+	bool failed;
 	/* Are we from a system call? */
 	if (syscall_get_nr(current, regs) >= 0) {
 		/* If so, check system call restarting.. */
@@ -677,7 +640,7 @@ handle_signal(unsigned long sig, siginfo_t *info, struct k_sigaction *ka,
 			break;
 
 		case -ERESTARTSYS:
-			if (!(ka->sa.sa_flags & SA_RESTART)) {
+			if (!(ksig->ka.sa.sa_flags & SA_RESTART)) {
 				regs->ax = -EINTR;
 				break;
 			}
@@ -697,26 +660,23 @@ handle_signal(unsigned long sig, siginfo_t *info, struct k_sigaction *ka,
 	    likely(test_and_clear_thread_flag(TIF_FORCED_TF)))
 		regs->flags &= ~X86_EFLAGS_TF;
 
-	if (setup_rt_frame(sig, ka, info, regs) < 0) {
-		force_sigsegv(sig, current);
-		return;
+	failed = (setup_rt_frame(ksig, regs) < 0);
+	if (!failed) {
+		/*
+		 * Clear the direction flag as per the ABI for function entry.
+		 *
+		 * Clear RF when entering the signal handler, because
+		 * it might disable possible debug exception from the
+		 * signal handler.
+		 *
+		 * Clear TF when entering the signal handler, but
+		 * notify any tracer that was single-stepping it.
+		 * The tracer may want to single-step inside the
+		 * handler too.
+		 */
+		regs->flags &= ~(X86_EFLAGS_DF|X86_EFLAGS_RF|X86_EFLAGS_TF);
 	}
-
-	/*
-	 * Clear the direction flag as per the ABI for function entry.
-	 */
-	regs->flags &= ~X86_EFLAGS_DF;
-
-	/*
-	 * Clear TF when entering the signal handler, but
-	 * notify any tracer that was single-stepping it.
-	 * The tracer may want to single-step inside the
-	 * handler too.
-	 */
-	regs->flags &= ~X86_EFLAGS_TF;
-
-	signal_delivered(sig, info, ka, regs,
-			 test_thread_flag(TIF_SINGLESTEP));
+	signal_setup_done(failed, ksig, test_thread_flag(TIF_SINGLESTEP));
 }
 
 #ifdef CONFIG_X86_32
@@ -733,14 +693,11 @@ handle_signal(unsigned long sig, siginfo_t *info, struct k_sigaction *ka,
  */
 static void do_signal(struct pt_regs *regs)
 {
-	struct k_sigaction ka;
-	siginfo_t info;
-	int signr;
+	struct ksignal ksig;
 
-	signr = get_signal_to_deliver(&info, &ka, regs, NULL);
-	if (signr > 0) {
+	if (get_signal(&ksig)) {
 		/* Whee! Actually deliver the signal.  */
-		handle_signal(signr, &info, &ka, regs);
+		handle_signal(&ksig, regs);
 		return;
 	}
 
@@ -773,19 +730,19 @@ static void do_signal(struct pt_regs *regs)
  * notification of userspace execution resumption
  * - triggered by the TIF_WORK_MASK flags
  */
-void
+__visible void
 do_notify_resume(struct pt_regs *regs, void *unused, __u32 thread_info_flags)
 {
+	user_exit();
+
 #ifdef CONFIG_X86_MCE
 	/* notify userspace of pending MCEs */
 	if (thread_info_flags & _TIF_MCE_NOTIFY)
 		mce_notify_process();
 #endif /* CONFIG_X86_64 && CONFIG_X86_MCE */
 
-	if (thread_info_flags & _TIF_UPROBE) {
-		clear_thread_flag(TIF_UPROBE);
+	if (thread_info_flags & _TIF_UPROBE)
 		uprobe_notify_resume(regs);
-	}
 
 	/* deal with pending signal delivery */
 	if (thread_info_flags & _TIF_SIGPENDING)
@@ -798,9 +755,7 @@ do_notify_resume(struct pt_regs *regs, void *unused, __u32 thread_info_flags)
 	if (thread_info_flags & _TIF_USER_RETURN_NOTIFY)
 		fire_user_return_notifiers();
 
-#ifdef CONFIG_X86_32
-	clear_thread_flag(TIF_IRET);
-#endif /* CONFIG_X86_32 */
+	user_enter();
 }
 
 void signal_fault(struct pt_regs *regs, void __user *frame, char *where)
@@ -814,85 +769,19 @@ void signal_fault(struct pt_regs *regs, void __user *frame, char *where)
 		       me->comm, me->pid, where, frame,
 		       regs->ip, regs->sp, regs->orig_ax);
 		print_vma_addr(" in ", regs->ip);
-		printk(KERN_CONT "\n");
+		pr_cont("\n");
 	}
 
 	force_sig(SIGSEGV, me);
 }
 
 #ifdef CONFIG_X86_X32_ABI
-static int x32_setup_rt_frame(int sig, struct k_sigaction *ka,
-			      siginfo_t *info, compat_sigset_t *set,
-			      struct pt_regs *regs)
-{
-	struct rt_sigframe_x32 __user *frame;
-	void __user *restorer;
-	int err = 0;
-	void __user *fpstate = NULL;
-
-	frame = get_sigframe(ka, regs, sizeof(*frame), &fpstate);
-
-	if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
-		return -EFAULT;
-
-	if (ka->sa.sa_flags & SA_SIGINFO) {
-		if (copy_siginfo_to_user32(&frame->info, info))
-			return -EFAULT;
-	}
-
-	put_user_try {
-		/* Create the ucontext.  */
-		if (cpu_has_xsave)
-			put_user_ex(UC_FP_XSTATE, &frame->uc.uc_flags);
-		else
-			put_user_ex(0, &frame->uc.uc_flags);
-		put_user_ex(0, &frame->uc.uc_link);
-		put_user_ex(current->sas_ss_sp, &frame->uc.uc_stack.ss_sp);
-		put_user_ex(sas_ss_flags(regs->sp),
-			    &frame->uc.uc_stack.ss_flags);
-		put_user_ex(current->sas_ss_size, &frame->uc.uc_stack.ss_size);
-		put_user_ex(0, &frame->uc.uc__pad0);
-		err |= setup_sigcontext(&frame->uc.uc_mcontext, fpstate,
-					regs, set->sig[0]);
-		err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
-
-		if (ka->sa.sa_flags & SA_RESTORER) {
-			restorer = ka->sa.sa_restorer;
-		} else {
-			/* could use a vstub here */
-			restorer = NULL;
-			err |= -EFAULT;
-		}
-		put_user_ex(restorer, &frame->pretcode);
-	} put_user_catch(err);
-
-	if (err)
-		return -EFAULT;
-
-	/* Set up registers for signal handler */
-	regs->sp = (unsigned long) frame;
-	regs->ip = (unsigned long) ka->sa.sa_handler;
-
-	/* We use the x32 calling convention here... */
-	regs->di = sig;
-	regs->si = (unsigned long) &frame->info;
-	regs->dx = (unsigned long) &frame->uc;
-
-	loadsegment(ds, __USER_DS);
-	loadsegment(es, __USER_DS);
-
-	regs->cs = __USER_CS;
-	regs->ss = __USER_DS;
-
-	return 0;
-}
-
-asmlinkage long sys32_x32_rt_sigreturn(struct pt_regs *regs)
+asmlinkage long sys32_x32_rt_sigreturn(void)
 {
+	struct pt_regs *regs = current_pt_regs();
 	struct rt_sigframe_x32 __user *frame;
 	sigset_t set;
 	unsigned long ax;
-	struct pt_regs tregs;
 
 	frame = (struct rt_sigframe_x32 __user *)(regs->sp - 8);
 
@@ -906,8 +795,7 @@ asmlinkage long sys32_x32_rt_sigreturn(struct pt_regs *regs)
 	if (restore_sigcontext(regs, &frame->uc.uc_mcontext, &ax))
 		goto badframe;
 
-	tregs = *regs;
-	if (sys32_sigaltstack(&frame->uc.uc_stack, NULL, &tregs) == -EFAULT)
+	if (compat_restore_altstack(&frame->uc.uc_stack))
 		goto badframe;
 
 	return ax;