[SPARC]: Add support for *at(), ppoll, and pselect syscalls.

This also includes by necessity _TIF_RESTORE_SIGMASK support,
which actually resulted in a lot of cleanups.

The sparc signal handling code is quite a mess and I should
clean it up some day.
Signed-off-by: David S. Miller <davem@davemloft.net>

arch/sparc/kernel/entry.S

@@ -1276,62 +1276,6 @@ sys_sigstack:
 	call	do_sys_sigstack
 	 mov	%l5, %o7
 
-	.align	4
-	.globl	sys_sigpause
-sys_sigpause:
-	/* Note: %o0 already has correct value... */
-	call	do_sigpause
-	 add	%sp, STACKFRAME_SZ, %o1
-
-	ld	[%curptr + TI_FLAGS], %l5
-	andcc	%l5, _TIF_SYSCALL_TRACE, %g0
-	be	1f
-	 nop
-
-	call	syscall_trace
-	 nop
-
-1:
-	/* We are returning to a signal handler. */
-	RESTORE_ALL
-
-	.align	4
-	.globl	sys_sigsuspend
-sys_sigsuspend:
-	call	do_sigsuspend
-	 add	%sp, STACKFRAME_SZ, %o0
-
-	ld	[%curptr + TI_FLAGS], %l5
-	andcc	%l5, _TIF_SYSCALL_TRACE, %g0
-	be	1f
-	 nop
-
-	call	syscall_trace
-	 nop
-
-1:
-	/* We are returning to a signal handler. */
-	RESTORE_ALL
-
-	.align	4
-	.globl	sys_rt_sigsuspend
-sys_rt_sigsuspend:
-	/* Note: %o0, %o1 already have correct value... */
-	call	do_rt_sigsuspend
-	 add	%sp, STACKFRAME_SZ, %o2
-
-	ld	[%curptr + TI_FLAGS], %l5
-	andcc	%l5, _TIF_SYSCALL_TRACE, %g0
-	be	1f
-	 nop
-
-	call	syscall_trace
-	 nop
-
-1:
-	/* We are returning to a signal handler. */
-	RESTORE_ALL
-
 	.align	4
 	.globl	sys_sigreturn
 sys_sigreturn:

arch/sparc/kernel/rtrap.S

@@ -68,15 +68,14 @@ ret_trap_lockless_ipi:
 
 	ld	[%curptr + TI_FLAGS], %g2
 signal_p:
-	andcc	%g2, (_TIF_NOTIFY_RESUME|_TIF_SIGPENDING), %g0
+	andcc	%g2, (_TIF_SIGPENDING|_TIF_RESTORE_SIGMASK), %g0
 	bz,a	ret_trap_continue
 	 ld	[%sp + STACKFRAME_SZ + PT_PSR], %t_psr
 
-	clr	%o0
-	mov	%l5, %o2
-	mov	%l6, %o3
+	mov	%l5, %o1
+	mov	%l6, %o2
 	call	do_signal
-	 add	%sp, STACKFRAME_SZ, %o1	! pt_regs ptr
+	 add	%sp, STACKFRAME_SZ, %o0	! pt_regs ptr
 
 	/* Fall through. */
 	ld	[%sp + STACKFRAME_SZ + PT_PSR], %t_psr

arch/sparc/kernel/signal.c

@@ -35,9 +35,6 @@ extern void fpsave(unsigned long *fpregs, unsigned long *fsr,
 		   void *fpqueue, unsigned long *fpqdepth);
 extern void fpload(unsigned long *fpregs, unsigned long *fsr);
 
-asmlinkage int do_signal(sigset_t *oldset, struct pt_regs * regs,
-			 unsigned long orig_o0, int restart_syscall);
-
 /* Signal frames: the original one (compatible with SunOS):
  *
  * Set up a signal frame... Make the stack look the way SunOS
@@ -95,98 +92,30 @@ struct rt_signal_frame {
 #define NF_ALIGNEDSZ  (((sizeof(struct new_signal_frame) + 7) & (~7)))
 #define RT_ALIGNEDSZ  (((sizeof(struct rt_signal_frame) + 7) & (~7)))
 
-/*
- * atomically swap in the new signal mask, and wait for a signal.
- * This is really tricky on the Sparc, watch out...
- */
-asmlinkage void _sigpause_common(old_sigset_t set, struct pt_regs *regs)
+static int _sigpause_common(old_sigset_t set)
 {
-	sigset_t saveset;
-
 	set &= _BLOCKABLE;
 	spin_lock_irq(&current->sighand->siglock);
-	saveset = current->blocked;
+	current->saved_sigmask = current->blocked;
 	siginitset(&current->blocked, set);
 	recalc_sigpending();
 	spin_unlock_irq(&current->sighand->siglock);
 
-	regs->pc = regs->npc;
-	regs->npc += 4;
-
-	/* Condition codes and return value where set here for sigpause,
-	 * and so got used by setup_frame, which again causes sigreturn()
-	 * to return -EINTR.
-	 */
-	while (1) {
 	current->state = TASK_INTERRUPTIBLE;
 	schedule();
-		/*
-		 * Return -EINTR and set condition code here,
-		 * so the interrupted system call actually returns
-		 * these.
-		 */
-		regs->psr |= PSR_C;
-		regs->u_regs[UREG_I0] = EINTR;
-		if (do_signal(&saveset, regs, 0, 0))
-			return;
-	}
-}
+	set_thread_flag(TIF_RESTORE_SIGMASK);
 
-asmlinkage void do_sigpause(unsigned int set, struct pt_regs *regs)
-{
-	_sigpause_common(set, regs);
+	return -ERESTARTNOHAND;
 }
 
-asmlinkage void do_sigsuspend (struct pt_regs *regs)
+asmlinkage int sys_sigpause(unsigned int set)
 {
-	_sigpause_common(regs->u_regs[UREG_I0], regs);
+	return _sigpause_common(set);
 }
 
-asmlinkage void do_rt_sigsuspend(sigset_t __user *uset, size_t sigsetsize,
-				 struct pt_regs *regs)
+asmlinkage int sys_sigsuspend(old_sigset_t set)
 {
-	sigset_t oldset, set;
-
-	/* XXX: Don't preclude handling different sized sigset_t's.  */
-	if (sigsetsize != sizeof(sigset_t)) {
-		regs->psr |= PSR_C;
-		regs->u_regs[UREG_I0] = EINVAL;
-		return;
-	}
-
-	if (copy_from_user(&set, uset, sizeof(set))) {
-		regs->psr |= PSR_C;
-		regs->u_regs[UREG_I0] = EFAULT;
-		return;
-	}
-
-	sigdelsetmask(&set, ~_BLOCKABLE);
-	spin_lock_irq(&current->sighand->siglock);
-	oldset = current->blocked;
-	current->blocked = set;
-	recalc_sigpending();
-	spin_unlock_irq(&current->sighand->siglock);
-
-	regs->pc = regs->npc;
-	regs->npc += 4;
-
-	/* Condition codes and return value where set here for sigpause,
-	 * and so got used by setup_frame, which again causes sigreturn()
-	 * to return -EINTR.
-	 */
-	while (1) {
-		current->state = TASK_INTERRUPTIBLE;
-		schedule();
-		/*
-		 * Return -EINTR and set condition code here,
-		 * so the interrupted system call actually returns
-		 * these.
-		 */
-		regs->psr |= PSR_C;
-		regs->u_regs[UREG_I0] = EINTR;
-		if (do_signal(&oldset, regs, 0, 0))
-			return;
-	}
+	return _sigpause_common(set);
 }
 
 static inline int
@@ -1067,13 +996,13 @@ static inline void syscall_restart(unsigned long orig_i0, struct pt_regs *regs,
  * want to handle. Thus you cannot kill init even with a SIGKILL even by
  * mistake.
  */
-asmlinkage int do_signal(sigset_t *oldset, struct pt_regs * regs,
-			 unsigned long orig_i0, int restart_syscall)
+asmlinkage void do_signal(struct pt_regs * regs, unsigned long orig_i0, int restart_syscall)
 {
 	siginfo_t info;
 	struct sparc_deliver_cookie cookie;
 	struct k_sigaction ka;
 	int signr;
+	sigset_t *oldset;
 
 	/*
 	 * XXX Disable svr4 signal handling until solaris emulation works.
@@ -1089,7 +1018,9 @@ asmlinkage int do_signal(sigset_t *oldset, struct pt_regs * regs,
 	cookie.restart_syscall = restart_syscall;
 	cookie.orig_i0 = orig_i0;
 
-	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, &cookie);
@@ -1098,7 +1029,14 @@ asmlinkage int do_signal(sigset_t *oldset, struct pt_regs * regs,
 			syscall_restart(cookie.orig_i0, regs, &ka.sa);
 		handle_signal(signr, &ka, &info, oldset,
 			      regs, svr4_signal);
-		return 1;
+		/* 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;
 	}
 	if (cookie.restart_syscall &&
 	    (regs->u_regs[UREG_I0] == ERESTARTNOHAND ||
@@ -1115,7 +1053,14 @@ asmlinkage int do_signal(sigset_t *oldset, struct pt_regs * regs,
 		regs->pc -= 4;
 		regs->npc -= 4;
 	}
-	return 0;
+
+	/* 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);
+	}
 }
 
 asmlinkage int

arch/sparc/kernel/sparc_ksyms.c

@@ -66,7 +66,6 @@ struct poll {
 
 extern int svr4_getcontext (svr4_ucontext_t *, struct pt_regs *);
 extern int svr4_setcontext (svr4_ucontext_t *, struct pt_regs *);
-void _sigpause_common (unsigned int set, struct pt_regs *);
 extern void (*__copy_1page)(void *, const void *);
 extern void __memmove(void *, const void *, __kernel_size_t);
 extern void (*bzero_1page)(void *);
@@ -227,7 +226,6 @@ EXPORT_SYMBOL(kunmap_atomic);
 /* Solaris/SunOS binary compatibility */
 EXPORT_SYMBOL(svr4_setcontext);
 EXPORT_SYMBOL(svr4_getcontext);
-EXPORT_SYMBOL(_sigpause_common);
 
 EXPORT_SYMBOL(dump_thread);
 

arch/sparc/kernel/systbls.S

@@ -75,7 +75,10 @@ sys_call_table:
 /*265*/	.long sys_timer_delete, sys_timer_create, sys_nis_syscall, sys_io_setup, sys_io_destroy
 /*270*/	.long sys_io_submit, sys_io_cancel, sys_io_getevents, sys_mq_open, sys_mq_unlink
 /*275*/	.long sys_mq_timedsend, sys_mq_timedreceive, sys_mq_notify, sys_mq_getsetattr, sys_waitid
-/*280*/	.long sys_ni_syscall, sys_add_key, sys_request_key, sys_keyctl
+/*280*/	.long sys_ni_syscall, sys_add_key, sys_request_key, sys_keyctl, sys_openat
+/*285*/	.long sys_mkdirat, sys_mknodat, sys_fchownat, sys_futimesat, sys_newfstatat
+/*290*/	.long sys_unlinkat, sys_renameat, sys_linkat, sys_symlinkat, sys_readlinkat
+/*295*/	.long sys_fchmodat, sys_faccessat, sys_pselect6, sys_ppoll
 
 #ifdef CONFIG_SUNOS_EMUL
 	/* Now the SunOS syscall table. */
@@ -181,6 +184,11 @@ sunos_sys_table:
 	.long sunos_nosys, sunos_nosys, sunos_nosys
 	.long sunos_nosys
 /*280*/	.long sunos_nosys, sunos_nosys, sunos_nosys
+	.long sunos_nosys, sunos_nosys, sunos_nosys
+	.long sunos_nosys, sunos_nosys, sunos_nosys
 	.long sunos_nosys
+/*290*/	.long sunos_nosys, sunos_nosys, sunos_nosys
+	.long sunos_nosys, sunos_nosys, sunos_nosys
+	.long sunos_nosys, sunos_nosys, sunos_nosys
 
 #endif

arch/sparc64/kernel/entry.S

@@ -1416,7 +1416,6 @@ execve_merge:
 	 add		%sp, PTREGS_OFF, %o0
 
 	.globl	sys_pipe, sys_sigpause, sys_nis_syscall
-	.globl	sys_sigsuspend, sys_rt_sigsuspend
 	.globl	sys_rt_sigreturn
 	.globl	sys_ptrace
 	.globl	sys_sigaltstack
@@ -1440,28 +1439,6 @@ sys32_sigaltstack:
 		 mov		%i6, %o2
 #endif
 		.align		32
-sys_sigsuspend:	add		%sp, PTREGS_OFF, %o0
-		call		do_sigsuspend
-		 add		%o7, 1f-.-4, %o7
-		nop
-sys_rt_sigsuspend: /* NOTE: %o0,%o1 have a correct value already */
-		add		%sp, PTREGS_OFF, %o2
-		call		do_rt_sigsuspend
-		 add		%o7, 1f-.-4, %o7
-		nop
-#ifdef CONFIG_COMPAT
-	.globl	sys32_rt_sigsuspend
-sys32_rt_sigsuspend: /* NOTE: %o0,%o1 have a correct value already */
-		srl		%o0, 0, %o0
-		add		%sp, PTREGS_OFF, %o2
-		call		do_rt_sigsuspend32
-		 add		%o7, 1f-.-4, %o7
-#endif
-		/* NOTE: %o0 has a correct value already */
-sys_sigpause:	add		%sp, PTREGS_OFF, %o1
-		call		do_sigpause
-		 add		%o7, 1f-.-4, %o7
-		nop
 #ifdef CONFIG_COMPAT
 	.globl	sys32_sigreturn
 sys32_sigreturn:

arch/sparc64/kernel/rtrap.S

@@ -53,14 +53,13 @@ __handle_user_windows:
 		wrpr			%g0, RTRAP_PSTATE_IRQOFF, %pstate
 		ldx			[%g6 + TI_FLAGS], %l0
 
-1:		andcc			%l0, (_TIF_NOTIFY_RESUME | _TIF_SIGPENDING), %g0
+1:		andcc			%l0, (_TIF_SIGPENDING | _TIF_RESTORE_SIGMASK), %g0
 		be,pt			%xcc, __handle_user_windows_continue
 		 nop
-		clr			%o0
-		mov			%l5, %o2
-		mov			%l6, %o3
-		add			%sp, PTREGS_OFF, %o1
-		mov			%l0, %o4
+		mov			%l5, %o1
+		mov			%l6, %o2
+		add			%sp, PTREGS_OFF, %o0
+		mov			%l0, %o3
 
 		call			do_notify_resume
 		 wrpr			%g0, RTRAP_PSTATE, %pstate
@@ -96,15 +95,14 @@ __handle_perfctrs:
 		 wrpr			%g0, RTRAP_PSTATE, %pstate
 		wrpr			%g0, RTRAP_PSTATE_IRQOFF, %pstate
 		ldx			[%g6 + TI_FLAGS], %l0
-1:		andcc			%l0, (_TIF_NOTIFY_RESUME | _TIF_SIGPENDING), %g0
+1:		andcc			%l0, (_TIF_SIGPENDING | _TIF_RESTORE_SIGMASK), %g0
 
 		be,pt			%xcc, __handle_perfctrs_continue
 		 sethi			%hi(TSTATE_PEF), %o0
-		clr			%o0
-		mov			%l5, %o2
-		mov			%l6, %o3
-		add			%sp, PTREGS_OFF, %o1
-		mov			%l0, %o4
+		mov			%l5, %o1
+		mov			%l6, %o2
+		add			%sp, PTREGS_OFF, %o0
+		mov			%l0, %o3
 		call			do_notify_resume
 
 		 wrpr			%g0, RTRAP_PSTATE, %pstate
@@ -129,11 +127,10 @@ __handle_userfpu:
 		ba,a,pt			%xcc, __handle_userfpu_continue
 
 __handle_signal:
-		clr			%o0
-		mov			%l5, %o2
-		mov			%l6, %o3
-		add			%sp, PTREGS_OFF, %o1
-		mov			%l0, %o4
+		mov			%l5, %o1
+		mov			%l6, %o2
+		add			%sp, PTREGS_OFF, %o0
+		mov			%l0, %o3
 		call			do_notify_resume
 		 wrpr			%g0, RTRAP_PSTATE, %pstate
 		wrpr			%g0, RTRAP_PSTATE_IRQOFF, %pstate
@@ -200,7 +197,7 @@ __handle_preemption_continue:
 		 andcc			%l1, %o0, %g0
 		andcc			%l0, _TIF_NEED_RESCHED, %g0
 		bne,pn			%xcc, __handle_preemption
-		 andcc			%l0, (_TIF_NOTIFY_RESUME | _TIF_SIGPENDING), %g0
+		 andcc			%l0, (_TIF_SIGPENDING | _TIF_RESTORE_SIGMASK), %g0
 		bne,pn			%xcc, __handle_signal
 __handle_signal_continue:
 		 ldub			[%g6 + TI_WSAVED], %o2

arch/sparc64/kernel/signal.c

@@ -36,9 +36,6 @@
 
 #define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP)))
 
-static int do_signal(sigset_t *oldset, struct pt_regs * regs,
-		     unsigned long orig_o0, int ret_from_syscall);
-
 /* {set, get}context() needed for 64-bit SparcLinux userland. */
 asmlinkage void sparc64_set_context(struct pt_regs *regs)
 {
@@ -242,114 +239,29 @@ struct rt_signal_frame {
 /* Align macros */
 #define RT_ALIGNEDSZ  (((sizeof(struct rt_signal_frame) + 7) & (~7)))
 
-/*
- * atomically swap in the new signal mask, and wait for a signal.
- * This is really tricky on the Sparc, watch out...
- */
-asmlinkage void _sigpause_common(old_sigset_t set, struct pt_regs *regs)
+static long _sigpause_common(old_sigset_t set)
 {
-	sigset_t saveset;
-
-#ifdef CONFIG_SPARC32_COMPAT
-	if (test_thread_flag(TIF_32BIT)) {
-		extern asmlinkage void _sigpause32_common(compat_old_sigset_t,
-							  struct pt_regs *);
-		_sigpause32_common(set, regs);
-		return;
-	}
-#endif
 	set &= _BLOCKABLE;
 	spin_lock_irq(&current->sighand->siglock);
-	saveset = current->blocked;
+	current->saved_sigmask = current->blocked;
 	siginitset(&current->blocked, set);
 	recalc_sigpending();
 	spin_unlock_irq(&current->sighand->siglock);
 
-	if (test_thread_flag(TIF_32BIT)) {
-		regs->tpc = (regs->tnpc & 0xffffffff);
-		regs->tnpc = (regs->tnpc + 4) & 0xffffffff;
-	} else {
-		regs->tpc = regs->tnpc;
-		regs->tnpc += 4;
-	}
-
-	/* Condition codes and return value where set here for sigpause,
-	 * and so got used by setup_frame, which again causes sigreturn()
-	 * to return -EINTR.
-	 */
-	while (1) {
 	current->state = TASK_INTERRUPTIBLE;
 	schedule();
-		/*
-		 * Return -EINTR and set condition code here,
-		 * so the interrupted system call actually returns
-		 * these.
-		 */
-		regs->tstate |= (TSTATE_ICARRY|TSTATE_XCARRY);
-		regs->u_regs[UREG_I0] = EINTR;
-		if (do_signal(&saveset, regs, 0, 0))
-			return;
-	}
+	set_thread_flag(TIF_RESTORE_SIGMASK);
+	return -ERESTARTNOHAND;
 }
 
-asmlinkage void do_sigpause(unsigned int set, struct pt_regs *regs)
+asmlinkage long sys_sigpause(unsigned int set)
 {
-	_sigpause_common(set, regs);
+	return _sigpause_common(set);
 }
 
-asmlinkage void do_sigsuspend(struct pt_regs *regs)
+asmlinkage long sys_sigsuspend(old_sigset_t set)
 {
-	_sigpause_common(regs->u_regs[UREG_I0], regs);
-}
-
-asmlinkage void do_rt_sigsuspend(sigset_t __user *uset, size_t sigsetsize, struct pt_regs *regs)
-{
-	sigset_t oldset, set;
-        
-	/* XXX: Don't preclude handling different sized sigset_t's.  */
-	if (sigsetsize != sizeof(sigset_t)) {
-		regs->tstate |= (TSTATE_ICARRY|TSTATE_XCARRY);
-		regs->u_regs[UREG_I0] = EINVAL;
-		return;
-	}
-	if (copy_from_user(&set, uset, sizeof(set))) {
-		regs->tstate |= (TSTATE_ICARRY|TSTATE_XCARRY);
-		regs->u_regs[UREG_I0] = EFAULT;
-		return;
-	}
-                                                                
-	sigdelsetmask(&set, ~_BLOCKABLE);
-	spin_lock_irq(&current->sighand->siglock);
-	oldset = current->blocked;
-	current->blocked = set;
-	recalc_sigpending();
-	spin_unlock_irq(&current->sighand->siglock);
-	
-	if (test_thread_flag(TIF_32BIT)) {
-		regs->tpc = (regs->tnpc & 0xffffffff);
-		regs->tnpc = (regs->tnpc + 4) & 0xffffffff;
-	} else {
-		regs->tpc = regs->tnpc;
-		regs->tnpc += 4;
-	}
-
-	/* Condition codes and return value where set here for sigpause,
-	 * and so got used by setup_frame, which again causes sigreturn()
-	 * to return -EINTR.
-	 */
-	while (1) {
-		current->state = TASK_INTERRUPTIBLE;
-		schedule();
-		/*
-		 * Return -EINTR and set condition code here,
-		 * so the interrupted system call actually returns
-		 * these.
-		 */
-		regs->tstate |= (TSTATE_ICARRY|TSTATE_XCARRY);
-		regs->u_regs[UREG_I0] = EINTR;
-		if (do_signal(&oldset, regs, 0, 0))
-			return;
-	}
+	return _sigpause_common(set);
 }
 
 static inline int
@@ -607,26 +519,29 @@ static inline void syscall_restart(unsigned long orig_i0, struct pt_regs *regs,
  * want to handle. Thus you cannot kill init even with a SIGKILL even by
  * mistake.
  */
-static int do_signal(sigset_t *oldset, struct pt_regs * regs,
-		     unsigned long orig_i0, int restart_syscall)
+static void do_signal(struct pt_regs *regs, unsigned long orig_i0, int restart_syscall)
 {
 	siginfo_t info;
 	struct signal_deliver_cookie cookie;
 	struct k_sigaction ka;
 	int signr;
+	sigset_t *oldset;
 	
 	cookie.restart_syscall = restart_syscall;
 	cookie.orig_i0 = orig_i0;
 
-	if (!oldset)
+	if (test_thread_flag(TIF_RESTORE_SIGMASK))
+		oldset = &current->saved_sigmask;
+	else
 		oldset = &current->blocked;
 
 #ifdef CONFIG_SPARC32_COMPAT
 	if (test_thread_flag(TIF_32BIT)) {
-		extern int do_signal32(sigset_t *, struct pt_regs *,
+		extern void do_signal32(sigset_t *, struct pt_regs *,
 					unsigned long, int);
-		return do_signal32(oldset, regs, orig_i0,
+		do_signal32(oldset, regs, orig_i0,
 			    cookie.restart_syscall);
+		return;
 	}
 #endif	
 
@@ -635,7 +550,15 @@ static int do_signal(sigset_t *oldset, struct pt_regs * regs,
 		if (cookie.restart_syscall)
 			syscall_restart(orig_i0, regs, &ka.sa);
 		handle_signal(signr, &ka, &info, oldset, regs);
-		return 1;
+
+		/* 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;
 	}
 	if (cookie.restart_syscall &&
 	    (regs->u_regs[UREG_I0] == ERESTARTNOHAND ||
@@ -652,15 +575,21 @@ static int do_signal(sigset_t *oldset, struct pt_regs * regs,
 		regs->tpc -= 4;
 		regs->tnpc -= 4;
 	}
-	return 0;
+
+	/* 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);
+	}
 }
 
-void do_notify_resume(sigset_t *oldset, struct pt_regs *regs,
-		      unsigned long orig_i0, int restart_syscall,
+void do_notify_resume(struct pt_regs *regs, unsigned long orig_i0, int restart_syscall,
 		      unsigned long thread_info_flags)
 {
-	if (thread_info_flags & _TIF_SIGPENDING)
-		do_signal(oldset, regs, orig_i0, restart_syscall);
+	if (thread_info_flags & (_TIF_SIGPENDING | _TIF_RESTORE_SIGMASK))
+		do_signal(regs, orig_i0, restart_syscall);
 }
 
 void ptrace_signal_deliver(struct pt_regs *regs, void *cookie)

arch/sparc64/kernel/signal32.c

@@ -32,9 +32,6 @@
 
 #define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP)))
 
-int do_signal32(sigset_t *oldset, struct pt_regs *regs,
-		unsigned long orig_o0, int ret_from_syscall);
-
 /* Signal frames: the original one (compatible with SunOS):
  *
  * Set up a signal frame... Make the stack look the way SunOS
@@ -226,102 +223,6 @@ int copy_siginfo_from_user32(siginfo_t *to, compat_siginfo_t __user *from)
 	return 0;
 }
 
-/*
- * atomically swap in the new signal mask, and wait for a signal.
- * This is really tricky on the Sparc, watch out...
- */
-asmlinkage void _sigpause32_common(compat_old_sigset_t set, struct pt_regs *regs)
-{
-	sigset_t saveset;
-
-	set &= _BLOCKABLE;
-	spin_lock_irq(&current->sighand->siglock);
-	saveset = current->blocked;
-	siginitset(&current->blocked, set);
-	recalc_sigpending();
-	spin_unlock_irq(&current->sighand->siglock);
-	
-	regs->tpc = regs->tnpc;
-	regs->tnpc += 4;
-	if (test_thread_flag(TIF_32BIT)) {
-		regs->tpc &= 0xffffffff;
-		regs->tnpc &= 0xffffffff;
-	}
-
-	/* Condition codes and return value where set here for sigpause,
-	 * and so got used by setup_frame, which again causes sigreturn()
-	 * to return -EINTR.
-	 */
-	while (1) {
-		current->state = TASK_INTERRUPTIBLE;
-		schedule();
-		/*
-		 * Return -EINTR and set condition code here,
-		 * so the interrupted system call actually returns
-		 * these.
-		 */
-		regs->tstate |= TSTATE_ICARRY;
-		regs->u_regs[UREG_I0] = EINTR;
-		if (do_signal32(&saveset, regs, 0, 0))
-			return;
-	}
-}
-
-asmlinkage void do_rt_sigsuspend32(u32 uset, size_t sigsetsize, struct pt_regs *regs)
-{
-	sigset_t oldset, set;
-	compat_sigset_t set32;
-        
-	/* XXX: Don't preclude handling different sized sigset_t's.  */
-	if (((compat_size_t)sigsetsize) != sizeof(sigset_t)) {
-		regs->tstate |= TSTATE_ICARRY;
-		regs->u_regs[UREG_I0] = EINVAL;
-		return;
-	}
-	if (copy_from_user(&set32, compat_ptr(uset), sizeof(set32))) {
-		regs->tstate |= TSTATE_ICARRY;
-		regs->u_regs[UREG_I0] = EFAULT;
-		return;
-	}
-	switch (_NSIG_WORDS) {
-	case 4: set.sig[3] = set32.sig[6] + (((long)set32.sig[7]) << 32);
-	case 3: set.sig[2] = set32.sig[4] + (((long)set32.sig[5]) << 32);
-	case 2: set.sig[1] = set32.sig[2] + (((long)set32.sig[3]) << 32);
-	case 1: set.sig[0] = set32.sig[0] + (((long)set32.sig[1]) << 32);
-	}
-	sigdelsetmask(&set, ~_BLOCKABLE);
-	spin_lock_irq(&current->sighand->siglock);
-	oldset = current->blocked;
-	current->blocked = set;
-	recalc_sigpending();
-	spin_unlock_irq(&current->sighand->siglock);
-	
-	regs->tpc = regs->tnpc;
-	regs->tnpc += 4;
-	if (test_thread_flag(TIF_32BIT)) {
-		regs->tpc &= 0xffffffff;
-		regs->tnpc &= 0xffffffff;
-	}
-
-	/* Condition codes and return value where set here for sigpause,
-	 * and so got used by setup_frame, which again causes sigreturn()
-	 * to return -EINTR.
-	 */
-	while (1) {
-		current->state = TASK_INTERRUPTIBLE;
-		schedule();
-		/*
-		 * Return -EINTR and set condition code here,
-		 * so the interrupted system call actually returns
-		 * these.
-		 */
-		regs->tstate |= TSTATE_ICARRY;
-		regs->u_regs[UREG_I0] = EINTR;
-		if (do_signal32(&oldset, regs, 0, 0))
-			return;
-	}
-}
-
 static int restore_fpu_state32(struct pt_regs *regs, __siginfo_fpu_t __user *fpu)
 {
 	unsigned long *fpregs = current_thread_info()->fpregs;
@@ -1362,7 +1263,7 @@ static inline void syscall_restart32(unsigned long orig_i0, struct pt_regs *regs
  * want to handle. Thus you cannot kill init even with a SIGKILL even by
  * mistake.
  */
-int do_signal32(sigset_t *oldset, struct pt_regs * regs,
+void do_signal32(sigset_t *oldset, struct pt_regs * regs,
 		 unsigned long orig_i0, int restart_syscall)
 {
 	siginfo_t info;
@@ -1380,7 +1281,15 @@ int do_signal32(sigset_t *oldset, struct pt_regs * regs,
 			syscall_restart32(orig_i0, regs, &ka.sa);
 		handle_signal32(signr, &ka, &info, oldset,
 				regs, svr4_signal);
-		return 1;
+
+		/* 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;
 	}
 	if (cookie.restart_syscall &&
 	    (regs->u_regs[UREG_I0] == ERESTARTNOHAND ||
@@ -1397,7 +1306,14 @@ int do_signal32(sigset_t *oldset, struct pt_regs * regs,
 		regs->tpc -= 4;
 		regs->tnpc -= 4;
 	}
-	return 0;
+
+	/* 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);
+	}
 }
 
 struct sigstack32 {

arch/sparc64/kernel/sparc64_ksyms.c

@@ -69,7 +69,6 @@ struct poll {
 
 extern void die_if_kernel(char *str, struct pt_regs *regs);
 extern pid_t kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);
-void _sigpause_common (unsigned int set, struct pt_regs *);
 extern void *__bzero(void *, size_t);
 extern void *__memscan_zero(void *, size_t);
 extern void *__memscan_generic(void *, int, size_t);
@@ -236,9 +235,10 @@ EXPORT_SYMBOL(pci_dma_supported);
 /* I/O device mmaping on Sparc64. */
 EXPORT_SYMBOL(io_remap_pfn_range);
 
+#ifdef CONFIG_COMPAT
 /* Solaris/SunOS binary compatibility */
-EXPORT_SYMBOL(_sigpause_common);
 EXPORT_SYMBOL(verify_compat_iovec);
+#endif
 
 EXPORT_SYMBOL(dump_fpu);
 EXPORT_SYMBOL(pte_alloc_one_kernel);

arch/sparc64/kernel/systbls.S

@@ -41,7 +41,7 @@ sys_call_table32:
 /*90*/	.word sys_dup2, sys_setfsuid, compat_sys_fcntl, sys32_select, sys_setfsgid
 	.word sys_fsync, sys32_setpriority, sys_nis_syscall, sys_nis_syscall, sys_nis_syscall
 /*100*/ .word sys32_getpriority, sys32_rt_sigreturn, sys32_rt_sigaction, sys32_rt_sigprocmask, sys32_rt_sigpending
-	.word compat_sys_rt_sigtimedwait, sys32_rt_sigqueueinfo, sys32_rt_sigsuspend, sys_setresuid, sys_getresuid
+	.word compat_sys_rt_sigtimedwait, sys32_rt_sigqueueinfo, compat_sys_rt_sigsuspend, sys_setresuid, sys_getresuid
 /*110*/	.word sys_setresgid, sys_getresgid, sys_setregid, sys_nis_syscall, sys_nis_syscall
 	.word sys32_getgroups, sys32_gettimeofday, sys32_getrusage, sys_nis_syscall, sys_getcwd
 /*120*/	.word compat_sys_readv, compat_sys_writev, sys32_settimeofday, sys32_fchown16, sys_fchmod
@@ -76,7 +76,10 @@ sys_call_table32:
 	.word sys_timer_delete, compat_sys_timer_create, sys_ni_syscall, compat_sys_io_setup, sys_io_destroy
 /*270*/	.word sys32_io_submit, sys_io_cancel, compat_sys_io_getevents, sys32_mq_open, sys_mq_unlink
 	.word compat_sys_mq_timedsend, compat_sys_mq_timedreceive, compat_sys_mq_notify, compat_sys_mq_getsetattr, compat_sys_waitid
-/*280*/	.word sys_ni_syscall, sys_add_key, sys_request_key, sys_keyctl
+/*280*/	.word sys_ni_syscall, sys_add_key, sys_request_key, sys_keyctl, compat_sys_openat
+	.word sys_mkdirat, sys_mknodat, sys_fchownat, sys_futimesat, compat_sys_newfstatat
+/*285*/	.word sys_unlinkat, sys_renameat, sys_linkat, sys_symlinkat, sys_readlinkat
+	.word sys_fchmodat, sys_faccessat, compat_sys_pselect6, compat_sys_ppoll
 
 #endif /* CONFIG_COMPAT */
 
@@ -142,7 +145,10 @@ sys_call_table:
 	.word sys_timer_delete, sys_timer_create, sys_ni_syscall, sys_io_setup, sys_io_destroy
 /*270*/	.word sys_io_submit, sys_io_cancel, sys_io_getevents, sys_mq_open, sys_mq_unlink
 	.word sys_mq_timedsend, sys_mq_timedreceive, sys_mq_notify, sys_mq_getsetattr, sys_waitid
-/*280*/	.word sys_nis_syscall, sys_add_key, sys_request_key, sys_keyctl
+/*280*/	.word sys_nis_syscall, sys_add_key, sys_request_key, sys_keyctl, sys_openat
+	.word sys_mkdirat, sys_mknodat, sys_fchownat, sys_futimesat, compat_sys_newfstatat
+/*285*/	.word sys_unlinkat, sys_renameat, sys_linkat, sys_symlinkat, sys_readlinkat
+	.word sys_fchmodat, sys_faccessat, sys_pselect6, sys_ppoll
 
 #if defined(CONFIG_SUNOS_EMUL) || defined(CONFIG_SOLARIS_EMUL) || \
     defined(CONFIG_SOLARIS_EMUL_MODULE)
@@ -239,13 +245,20 @@ sunos_sys_table:
 /*250*/	.word sunos_nosys, sunos_nosys, sunos_nosys
 	.word sunos_nosys, sunos_nosys, sunos_nosys
 	.word sunos_nosys, sunos_nosys, sunos_nosys
+	.word sunos_nosys
+/*260*/	.word sunos_nosys, sunos_nosys, sunos_nosys
 	.word sunos_nosys, sunos_nosys, sunos_nosys
 	.word sunos_nosys, sunos_nosys, sunos_nosys
+	.word sunos_nosys
+/*270*/	.word sunos_nosys, sunos_nosys, sunos_nosys
 	.word sunos_nosys, sunos_nosys, sunos_nosys
 	.word sunos_nosys, sunos_nosys, sunos_nosys
+	.word sunos_nosys
+/*280*/	.word sunos_nosys, sunos_nosys, sunos_nosys
 	.word sunos_nosys, sunos_nosys, sunos_nosys
 	.word sunos_nosys, sunos_nosys, sunos_nosys
+	.word sunos_nosys
+/*290*/	.word sunos_nosys, sunos_nosys, sunos_nosys
 	.word sunos_nosys, sunos_nosys, sunos_nosys
 	.word sunos_nosys, sunos_nosys, sunos_nosys
-	.word sunos_nosys
 #endif

arch/sparc64/solaris/entry64.S

@@ -180,6 +180,8 @@ solaris_sigsuspend:
 	 nop
 	call		sys_sigsuspend
 	 stx		%o0, [%sp + PTREGS_OFF + PT_V9_I0]
+	b,pt		%xcc, ret_from_solaris
+	 nop
 
 	.globl		solaris_getpid
 solaris_getpid:

include/asm-sparc/thread_info.h

@@ -128,9 +128,10 @@ BTFIXUPDEF_CALL(void, free_thread_info, struct thread_info *)
  * thread information flag bit numbers
  */
 #define TIF_SYSCALL_TRACE	0	/* syscall trace active */
-#define TIF_NOTIFY_RESUME	1	/* resumption notification requested */
+/* flag bit 1 is available */
 #define TIF_SIGPENDING		2	/* signal pending */
 #define TIF_NEED_RESCHED	3	/* rescheduling necessary */
+#define TIF_RESTORE_SIGMASK	4	/* restore signal mask in do_signal() */
 #define TIF_USEDFPU		8	/* FPU was used by this task
 					 * this quantum (SMP) */
 #define TIF_POLLING_NRFLAG	9	/* true if poll_idle() is polling
@@ -139,9 +140,9 @@ BTFIXUPDEF_CALL(void, free_thread_info, struct thread_info *)
 
 /* as above, but as bit values */
 #define _TIF_SYSCALL_TRACE	(1<<TIF_SYSCALL_TRACE)
-#define _TIF_NOTIFY_RESUME	(1<<TIF_NOTIFY_RESUME)
 #define _TIF_SIGPENDING		(1<<TIF_SIGPENDING)
 #define _TIF_NEED_RESCHED	(1<<TIF_NEED_RESCHED)
+#define _TIF_RESTORE_SIGMASK	(1<<TIF_RESTORE_SIGMASK)
 #define _TIF_USEDFPU		(1<<TIF_USEDFPU)
 #define _TIF_POLLING_NRFLAG	(1<<TIF_POLLING_NRFLAG)
 

include/asm-sparc/unistd.h

@@ -300,11 +300,26 @@
 #define __NR_add_key		281
 #define __NR_request_key	282
 #define __NR_keyctl		283
+#define __NR_openat		284
+#define __NR_mkdirat		285
+#define __NR_mknodat		286
+#define __NR_fchownat		287
+#define __NR_futimesat		288
+#define __NR_newfstatat		289
+#define __NR_unlinkat		290
+#define __NR_renameat		291
+#define __NR_linkat		292
+#define __NR_symlinkat		293
+#define __NR_readlinkat		294
+#define __NR_fchmodat		295
+#define __NR_faccessat		296
+#define __NR_pselect6		297
+#define __NR_ppoll		298
 
-/* WARNING: You MAY NOT add syscall numbers larger than 283, since
+/* WARNING: You MAY NOT add syscall numbers larger than 298, since
  *          all of the syscall tables in the Sparc kernel are
- *          sized to have 283 entries (starting at zero).  Therefore
- *          find a free slot in the 0-282 range.
+ *          sized to have 298 entries (starting at zero).  Therefore
+ *          find a free slot in the 0-298 range.
  */
 
 #define _syscall0(type,name) \
@@ -458,6 +473,7 @@ return -1; \
 #define __ARCH_WANT_SYS_OLDUMOUNT
 #define __ARCH_WANT_SYS_SIGPENDING
 #define __ARCH_WANT_SYS_SIGPROCMASK
+#define __ARCH_WANT_SYS_RT_SIGSUSPEND
 #endif
 
 #ifdef __KERNEL_SYSCALLS__

include/asm-sparc64/thread_info.h

@@ -221,7 +221,7 @@ register struct thread_info *current_thread_info_reg asm("g6");
  *	 nop
  */
 #define TIF_SYSCALL_TRACE	0	/* syscall trace active */
-#define TIF_NOTIFY_RESUME	1	/* resumption notification requested */
+#define TIF_RESTORE_SIGMASK	1	/* restore signal mask in do_signal() */
 #define TIF_SIGPENDING		2	/* signal pending */
 #define TIF_NEED_RESCHED	3	/* rescheduling necessary */
 #define TIF_PERFCTR		4	/* performance counters active */
@@ -241,7 +241,6 @@ register struct thread_info *current_thread_info_reg asm("g6");
 #define TIF_POLLING_NRFLAG	14
 
 #define _TIF_SYSCALL_TRACE	(1<<TIF_SYSCALL_TRACE)
-#define _TIF_NOTIFY_RESUME	(1<<TIF_NOTIFY_RESUME)
 #define _TIF_SIGPENDING		(1<<TIF_SIGPENDING)
 #define _TIF_NEED_RESCHED	(1<<TIF_NEED_RESCHED)
 #define _TIF_PERFCTR		(1<<TIF_PERFCTR)
@@ -250,11 +249,12 @@ register struct thread_info *current_thread_info_reg asm("g6");
 #define _TIF_32BIT		(1<<TIF_32BIT)
 #define _TIF_SECCOMP		(1<<TIF_SECCOMP)
 #define _TIF_SYSCALL_AUDIT	(1<<TIF_SYSCALL_AUDIT)
+#define _TIF_RESTORE_SIGMASK	(1<<TIF_RESTORE_SIGMASK)
 #define _TIF_ABI_PENDING	(1<<TIF_ABI_PENDING)
 #define _TIF_POLLING_NRFLAG	(1<<TIF_POLLING_NRFLAG)
 
 #define _TIF_USER_WORK_MASK	((0xff << TI_FLAG_WSAVED_SHIFT) | \
-				 (_TIF_NOTIFY_RESUME | _TIF_SIGPENDING | \
+				 (_TIF_SIGPENDING | _TIF_RESTORE_SIGMASK | \
 				  _TIF_NEED_RESCHED | _TIF_PERFCTR))
 
 #endif /* __KERNEL__ */

include/asm-sparc64/unistd.h

@@ -302,11 +302,26 @@
 #define __NR_add_key		281
 #define __NR_request_key	282
 #define __NR_keyctl		283
+#define __NR_openat		284
+#define __NR_mkdirat		285
+#define __NR_mknodat		286
+#define __NR_fchownat		287
+#define __NR_futimesat		288
+#define __NR_newfstatat		289
+#define __NR_unlinkat		290
+#define __NR_renameat		291
+#define __NR_linkat		292
+#define __NR_symlinkat		293
+#define __NR_readlinkat		294
+#define __NR_fchmodat		295
+#define __NR_faccessat		296
+#define __NR_pselect6		297
+#define __NR_ppoll		298
 
-/* WARNING: You MAY NOT add syscall numbers larger than 283, since
+/* WARNING: You MAY NOT add syscall numbers larger than 298, since
  *          all of the syscall tables in the Sparc kernel are
- *          sized to have 283 entries (starting at zero).  Therefore
- *          find a free slot in the 0-282 range.
+ *          sized to have 298 entries (starting at zero).  Therefore
+ *          find a free slot in the 0-298 range.
  */
 
 #define _syscall0(type,name) \
@@ -501,6 +516,8 @@ asmlinkage long sys_rt_sigaction(int sig,
 #define __ARCH_WANT_SYS_OLDUMOUNT
 #define __ARCH_WANT_SYS_SIGPENDING
 #define __ARCH_WANT_SYS_SIGPROCMASK
+#define __ARCH_WANT_SYS_RT_SIGSUSPEND
+#define __ARCH_WANT_COMPAT_SYS_RT_SIGSUSPEND
 #endif
 
 /*