X-Git-Url: http://plrg.eecs.uci.edu/git/?a=blobdiff_plain;f=arch%2Fmips%2Fkernel%2Firixsig.c;h=85c2e389edd6f1fea3f2c4465396ef73364604dd;hb=21a151d8ca3aa74ee79f9791a9d4dc370d3e0636;hp=e6f40609ba6a987ffb3189546ed3262795027b99;hpb=048c6140c0f5d0bb1af8308c91dfa560ac65a296;p=firefly-linux-kernel-4.4.55.git

diff --git a/arch/mips/kernel/irixsig.c b/arch/mips/kernel/irixsig.c
index e6f40609ba6a..85c2e389edd6 100644
--- a/arch/mips/kernel/irixsig.c
+++ b/arch/mips/kernel/irixsig.c
@@ -10,13 +10,13 @@
 #include <linux/mm.h>
 #include <linux/errno.h>
 #include <linux/smp.h>
-#include <linux/smp_lock.h>
 #include <linux/time.h>
 #include <linux/ptrace.h>
 #include <linux/resource.h>
 
 #include <asm/ptrace.h>
 #include <asm/uaccess.h>
+#include <asm/unistd.h>
 
 #undef DEBUG_SIG
 
@@ -163,20 +163,21 @@ static inline int handle_signal(unsigned long sig, siginfo_t *info,
 		ret = setup_irix_frame(ka, regs, sig, oldset);
 
 	spin_lock_irq(&current->sighand->siglock);
-	sigorsets(&current->blocked,&current->blocked,&ka->sa.sa_mask);
+	sigorsets(&current->blocked, &current->blocked, &ka->sa.sa_mask);
 	if (!(ka->sa.sa_flags & SA_NODEFER))
-		sigaddset(&current->blocked,sig);
+		sigaddset(&current->blocked, sig);
 	recalc_sigpending();
 	spin_unlock_irq(&current->sighand->siglock);
 
 	return ret;
 }
 
-asmlinkage int do_irix_signal(sigset_t *oldset, struct pt_regs *regs)
+void do_irix_signal(struct pt_regs *regs)
 {
 	struct k_sigaction ka;
 	siginfo_t info;
 	int signr;
+	sigset_t *oldset;
 
 	/*
 	 * We want the common case to go fast, which is why we may in certain
@@ -184,14 +185,27 @@ asmlinkage int do_irix_signal(sigset_t *oldset, struct pt_regs *regs)
 	 * if so.
 	 */
 	if (!user_mode(regs))
-		return 1;
+		return;
 
-	if (!oldset)
+	if (test_thread_flag(TIF_RESTORE_SIGMASK))
+		oldset = &current->saved_sigmask;
+	else
 		oldset = &current->blocked;
 
 	signr = get_signal_to_deliver(&info, &ka, regs, NULL);
-	if (signr > 0)
-		return handle_signal(signr, &info, &ka, oldset, regs);
+	if (signr > 0) {
+		/* Whee!  Actually deliver the signal.  */
+		if (handle_signal(signr, &info, &ka, oldset, regs) == 0) {
+			/* a signal was successfully delivered; the saved
+			 * sigmask will have been stored in the signal frame,
+			 * and will be restored by sigreturn, so we can simply
+			 * clear the TIF_RESTORE_SIGMASK flag */
+			if (test_thread_flag(TIF_RESTORE_SIGMASK))
+				clear_thread_flag(TIF_RESTORE_SIGMASK);
+		}
+
+		return;
+	}
 
 	/*
 	 * Who's code doesn't conform to the restartable syscall convention
@@ -204,8 +218,22 @@ asmlinkage int do_irix_signal(sigset_t *oldset, struct pt_regs *regs)
 		    regs->regs[2] == ERESTARTNOINTR) {
 			regs->cp0_epc -= 8;
 		}
+		if (regs->regs[2] == ERESTART_RESTARTBLOCK) {
+			regs->regs[2] = __NR_restart_syscall;
+			regs->regs[7] = regs->regs[26];
+			regs->cp0_epc -= 4;
+		}
+		regs->regs[0] = 0;	/* Don't deal with this again.  */
+	}
+
+	/*
+	* If there's no signal to deliver, we just put the saved sigmask
+	* back
+	*/
+	if (test_thread_flag(TIF_RESTORE_SIGMASK)) {
+		clear_thread_flag(TIF_RESTORE_SIGMASK);
+		sigprocmask(SIG_SETMASK, &current->saved_sigmask, NULL);
 	}
-	return 0;
 }
 
 asmlinkage void
@@ -294,6 +322,9 @@ struct sigact_irix5 {
 	int _unused0[2];
 };
 
+#define SIG_SETMASK32	256	/* Goodie from SGI for BSD compatibility:
+				   set only the low 32 bit of the sigset.  */
+
 #ifdef DEBUG_SIG
 static inline void dump_sigact_irix5(struct sigact_irix5 *p)
 {
@@ -409,7 +440,7 @@ asmlinkage int irix_sigprocmask(int how, irix_sigset_t __user *new,
 
 asmlinkage int irix_sigsuspend(struct pt_regs *regs)
 {
-	sigset_t saveset, newset;
+	sigset_t newset;
 	sigset_t __user *uset;
 
 	uset = (sigset_t __user *) regs->regs[4];
@@ -418,18 +449,15 @@ asmlinkage int irix_sigsuspend(struct pt_regs *regs)
 	sigdelsetmask(&newset, ~_BLOCKABLE);
 
 	spin_lock_irq(&current->sighand->siglock);
-	saveset = current->blocked;
+	current->saved_sigmask = current->blocked;
 	current->blocked = newset;
 	recalc_sigpending();
 	spin_unlock_irq(&current->sighand->siglock);
 
-	regs->regs[2] = -EINTR;
-	while (1) {
-		current->state = TASK_INTERRUPTIBLE;
-		schedule();
-		if (do_irix_signal(&saveset, regs))
-			return -EINTR;
-	}
+	current->state = TASK_INTERRUPTIBLE;
+	schedule();
+	set_thread_flag(TIF_RESTORE_SIGMASK);
+	return -ERESTARTNOHAND;
 }
 
 /* hate hate hate... */
@@ -577,8 +605,8 @@ repeat:
 	current->state = TASK_INTERRUPTIBLE;
 	read_lock(&tasklist_lock);
 	tsk = current;
-	list_for_each(_p,&tsk->children) {
-		p = list_entry(_p,struct task_struct,sibling);
+	list_for_each(_p, &tsk->children) {
+		p = list_entry(_p, struct task_struct, sibling);
 		if ((type == IRIX_P_PID) && p->pid != pid)
 			continue;
 		if ((type == IRIX_P_PGID) && process_group(p) != pid)
@@ -697,7 +725,7 @@ asmlinkage int irix_getcontext(struct pt_regs *regs)
 	       current->comm, current->pid, ctx);
 #endif
 
-	if (!access_ok(VERIFY_WRITE, ctx, sizeof(*ctx)));
+	if (!access_ok(VERIFY_WRITE, ctx, sizeof(*ctx)))
 		return -EFAULT;
 
 	error = __put_user(current->thread.irix_oldctx, &ctx->link);