1 files changed, 39 insertions, 94 deletions

diff --git a/arch/xtensa/kernel/signal.c b/arch/xtensa/kernel/signal.c
index f2220b5bdce..98b67d5f151 100644
--- a/arch/xtensa/kernel/signal.c
+++ b/arch/xtensa/kernel/signal.c
@@ -19,7 +19,7 @@
 #include <linux/errno.h>
 #include <linux/ptrace.h>
 #include <linux/personality.h>
-#include <linux/freezer.h>
+#include <linux/tracehook.h>
 
 #include <asm/ucontext.h>
 #include <asm/uaccess.h>
@@ -29,10 +29,6 @@
 
 #define DEBUG_SIG  0
 
-#define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP)))
-
-asmlinkage int do_signal(struct pt_regs *regs, sigset_t *oldset);
-
 extern struct task_struct *coproc_owners[];
 
 struct rt_sigframe
@@ -216,7 +212,7 @@ restore_sigcontext(struct pt_regs *regs, struct rt_sigframe __user *frame)
 	if (err)
 		return err;
 
- 	/* The signal handler may have used coprocessors in which
+	/* The signal handler may have used coprocessors in which
 	 * case they are still enabled.  We disable them to force a
 	 * reloading of the original task's CP state by the lazy
 	 * context-switching mechanisms of CP exception handling.
@@ -248,6 +244,9 @@ asmlinkage long xtensa_rt_sigreturn(long a0, long a1, long a2, long a3,
 	sigset_t set;
 	int ret;
 
+	/* Always make any pending restarted system calls return -EINTR */
+	current_thread_info()->restart_block.fn = do_no_restart_syscall;
+
 	if (regs->depc > 64)
 		panic("rt_sigreturn in double exception!\n");
 
@@ -259,18 +258,14 @@ asmlinkage long xtensa_rt_sigreturn(long a0, long a1, long a2, long a3,
 	if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set)))
 		goto badframe;
 
-	sigdelsetmask(&set, ~_BLOCKABLE);
-	spin_lock_irq(&current->sighand->siglock);
-	current->blocked = set;
-	recalc_sigpending();
-	spin_unlock_irq(&current->sighand->siglock);
+	set_current_blocked(&set);
 
 	if (restore_sigcontext(regs, frame))
 		goto badframe;
 
 	ret = regs->areg[2];
 
-	if (do_sigaltstack(&frame->uc.uc_stack, NULL, regs->areg[1]) == -EFAULT)
+	if (restore_altstack(&frame->uc.uc_stack))
 		goto badframe;
 
 	return ret;
@@ -336,17 +331,17 @@ gen_return_code(unsigned char *codemem)
 }
 
 
-static void setup_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
-			sigset_t *set, struct pt_regs *regs)
+static int setup_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
+		       sigset_t *set, struct pt_regs *regs)
 {
 	struct rt_sigframe *frame;
 	int err = 0;
 	int signal;
-	unsigned long sp, ra;
+	unsigned long sp, ra, tp;
 
 	sp = regs->areg[1];
 
-	if ((ka->sa.sa_flags & SA_ONSTACK) != 0 && ! on_sig_stack(sp)) {
+	if ((ka->sa.sa_flags & SA_ONSTACK) != 0 && sas_ss_flags(sp) == 0) {
 		sp = current->sas_ss_sp + current->sas_ss_size;
 	}
 
@@ -373,11 +368,7 @@ static void setup_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
 
 	err |= __put_user(0, &frame->uc.uc_flags);
 	err |= __put_user(0, &frame->uc.uc_link);
-	err |= __put_user((void *)current->sas_ss_sp,
-			  &frame->uc.uc_stack.ss_sp);
-	err |= __put_user(sas_ss_flags(regs->areg[1]),
-			  &frame->uc.uc_stack.ss_flags);
-	err |= __put_user(current->sas_ss_size, &frame->uc.uc_stack.ss_size);
+	err |= __save_altstack(&frame->uc.uc_stack, regs->areg[1]);
 	err |= setup_sigcontext(frame, regs);
 	err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
 
@@ -400,8 +391,9 @@ static void setup_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
 	 * Return context not modified until this point.
 	 */
 
-	/* Set up registers for signal handler */
-	start_thread(regs, (unsigned long) ka->sa.sa_handler, 
+	/* Set up registers for signal handler; preserve the threadptr */
+	tp = regs->threadptr;
+	start_thread(regs, (unsigned long) ka->sa.sa_handler,
 		     (unsigned long) frame);
 
 	/* Set up a stack frame for a call4
@@ -411,6 +403,7 @@ static void setup_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
 	regs->areg[6] = (unsigned long) signal;
 	regs->areg[7] = (unsigned long) &frame->info;
 	regs->areg[8] = (unsigned long) &frame->uc;
+	regs->threadptr = tp;
 
 	/* Set access mode to USER_DS.  Nomenclature is outdated, but
 	 * functionality is used in uaccess.h
@@ -422,58 +415,13 @@ static void setup_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
 		current->comm, current->pid, signal, frame, regs->pc);
 #endif
 
-	return;
+	return 0;
 
 give_sigsegv:
-	if (sig == SIGSEGV)
-		ka->sa.sa_handler = SIG_DFL;
-	force_sig(SIGSEGV, current);
-}
-
-/*
- * Atomically swap in the new signal mask, and wait for a signal.
- */
-
-asmlinkage long xtensa_rt_sigsuspend(sigset_t __user *unewset, 
-    				     size_t sigsetsize,
-    				     long a2, long a3, long a4, long a5, 
-				     struct pt_regs *regs)
-{
-	sigset_t saveset, newset;
-
-	/* XXX: Don't preclude handling different sized sigset_t's.  */
-	if (sigsetsize != sizeof(sigset_t))
-		return -EINVAL;
-
-	if (copy_from_user(&newset, unewset, sizeof(newset)))
-		return -EFAULT;
-
-	sigdelsetmask(&newset, ~_BLOCKABLE);
-	spin_lock_irq(&current->sighand->siglock);
-	saveset = current->blocked;
-	current->blocked = newset;
-	recalc_sigpending();
-	spin_unlock_irq(&current->sighand->siglock);
-
-	regs->areg[2] = -EINTR;
-	while (1) {
-		current->state = TASK_INTERRUPTIBLE;
-		schedule();
-		if (do_signal(regs, &saveset))
-			return -EINTR;
-	}
-}
-
-asmlinkage long xtensa_sigaltstack(const stack_t __user *uss, 
-				   stack_t __user *uoss,
-    				   long a2, long a3, long a4, long a5,
-				   struct pt_regs *regs)
-{
-	return do_sigaltstack(uss, uoss, regs->areg[1]);
+	force_sigsegv(sig, current);
+	return -EFAULT;
 }
 
-
-
 /*
  * Note that 'init' is a special process: it doesn't get signals it doesn't
  * want to handle. Thus you cannot kill init even with a SIGKILL even by
@@ -483,26 +431,18 @@ asmlinkage long xtensa_sigaltstack(const stack_t __user *uss,
  * the kernel can handle, and then we build all the user-level signal handling
  * stack-frames in one go after that.
  */
-int do_signal(struct pt_regs *regs, sigset_t *oldset)
+static void do_signal(struct pt_regs *regs)
 {
 	siginfo_t info;
 	int signr;
 	struct k_sigaction ka;
 
-	if (!user_mode(regs))
-		return 0;
-
-	if (try_to_freeze())
-		goto no_signal;
-
-	if (!oldset)
-		oldset = &current->blocked;
-
 	task_pt_regs(current)->icountlevel = 0;
 
 	signr = get_signal_to_deliver(&info, &ka, regs, NULL);
 
 	if (signr > 0) {
+		int ret;
 
 		/* Are we from a system call? */
 
@@ -536,24 +476,17 @@ int do_signal(struct pt_regs *regs, sigset_t *oldset)
 
 		/* Whee!  Actually deliver the signal.  */
 		/* Set up the stack frame */
-		setup_frame(signr, &ka, &info, oldset, regs);
-
-		if (ka.sa.sa_flags & SA_ONESHOT)
-			ka.sa.sa_handler = SIG_DFL;
+		ret = setup_frame(signr, &ka, &info, sigmask_to_save(), regs);
+		if (ret)
+			return;
 
-		spin_lock_irq(&current->sighand->siglock);
-		sigorsets(&current->blocked, &current->blocked, &ka.sa.sa_mask);
-		if (!(ka.sa.sa_flags & SA_NODEFER))
-			sigaddset(&current->blocked, signr);
-		recalc_sigpending();
-		spin_unlock_irq(&current->sighand->siglock);
+		signal_delivered(signr, &info, &ka, regs, 0);
 		if (current->ptrace & PT_SINGLESTEP)
 			task_pt_regs(current)->icountlevel = 1;
 
-		return 1;
+		return;
 	}
 
-no_signal:
 	/* Did we come from a system call? */
 	if ((signed) regs->syscall >= 0) {
 		/* Restart the system call - no handlers present */
@@ -570,8 +503,20 @@ no_signal:
 			break;
 		}
 	}
+
+	/* If there's no signal to deliver, we just restore the saved mask.  */
+	restore_saved_sigmask();
+
 	if (current->ptrace & PT_SINGLESTEP)
 		task_pt_regs(current)->icountlevel = 1;
-	return 0;
+	return;
 }
 
+void do_notify_resume(struct pt_regs *regs)
+{
+	if (test_thread_flag(TIF_SIGPENDING))
+		do_signal(regs);
+
+	if (test_and_clear_thread_flag(TIF_NOTIFY_RESUME))
+		tracehook_notify_resume(regs);
+}