[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;
-	}
-}
+	current->state = TASK_INTERRUPTIBLE;
+	schedule();
+	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: