alpha: support new syscalls

Some of the new syscalls require supporting TIF_RESTORE_SIGMASK.

Signed-off-by: Richard Henderson <rth@twiddle.net>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

5 files changed, 147 insertions, 52 deletions

diff --git a/arch/alpha/kernel/entry.S b/arch/alpha/kernel/entry.S
index c95e95e1ab0..debc8f03886 100644
--- a/arch/alpha/kernel/entry.S
+++ b/arch/alpha/kernel/entry.S
@@ -391,11 +391,10 @@ $work_resched:
         bne     $2, $work_resched
 
 $work_notifysig:
-        mov     $sp, $17
+        mov     $sp, $16
         br      $1, do_switch_stack
-        mov     $5, $21
-        mov     $sp, $18
-        mov     $31, $16
+        mov     $sp, $17
+        mov     $5, $18
         jsr     $26, do_notify_resume
         bsr     $1, undo_switch_stack
         br      restore_all
diff --git a/arch/alpha/kernel/signal.c b/arch/alpha/kernel/signal.c
index 7f64aa767d5..410af4f3140 100644
--- a/arch/alpha/kernel/signal.c
+++ b/arch/alpha/kernel/signal.c
@@ -32,8 +32,8 @@
 #define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP)))
 
 asmlinkage void ret_from_sys_call(void);
-static int do_signal(sigset_t *, struct pt_regs *, struct switch_stack *,
-                     unsigned long, unsigned long);
+static void do_signal(struct pt_regs *, struct switch_stack *,
+                      unsigned long, unsigned long);
 
 
 /*
@@ -146,11 +146,9 @@ sys_rt_sigaction(int sig, const struct sigaction __user *act,
 asmlinkage int
 do_sigsuspend(old_sigset_t mask, struct pt_regs *regs, struct switch_stack *sw)
 {
-        sigset_t oldset;
-
         mask &= _BLOCKABLE;
         spin_lock_irq(&current->sighand->siglock);
-        oldset = current->blocked;
+        current->saved_sigmask = current->blocked;
         siginitset(&current->blocked, mask);
         recalc_sigpending();
         spin_unlock_irq(&current->sighand->siglock);
@@ -160,19 +158,17 @@ do_sigsuspend(old_sigset_t mask, struct pt_regs *regs, struct switch_stack *sw)
         regs->r0 = EINTR;
         regs->r19 = 1;
 
-        while (1) {
-                current->state = TASK_INTERRUPTIBLE;
-                schedule();
-                if (do_signal(&oldset, regs, sw, 0, 0))
-                        return -EINTR;
-        }
+        current->state = TASK_INTERRUPTIBLE;
+        schedule();
+        set_thread_flag(TIF_RESTORE_SIGMASK);
+        return -ERESTARTNOHAND;
 }
 
 asmlinkage int
 do_rt_sigsuspend(sigset_t __user *uset, size_t sigsetsize,
                  struct pt_regs *regs, struct switch_stack *sw)
 {
-        sigset_t oldset, set;
+        sigset_t set;
 
         /* XXX: Don't preclude handling different sized sigset_t's.  */
         if (sigsetsize != sizeof(sigset_t))
@@ -182,7 +178,7 @@ do_rt_sigsuspend(sigset_t __user *uset, size_t sigsetsize,
 
         sigdelsetmask(&set, ~_BLOCKABLE);
         spin_lock_irq(&current->sighand->siglock);
-        oldset = current->blocked;
+        current->saved_sigmask = current->blocked;
         current->blocked = set;
         recalc_sigpending();
         spin_unlock_irq(&current->sighand->siglock);
@@ -192,12 +188,10 @@ do_rt_sigsuspend(sigset_t __user *uset, size_t sigsetsize,
         regs->r0 = EINTR;
         regs->r19 = 1;
 
-        while (1) {
-                current->state = TASK_INTERRUPTIBLE;
-                schedule();
-                if (do_signal(&oldset, regs, sw, 0, 0))
-                        return -EINTR;
-        }
+        current->state = TASK_INTERRUPTIBLE;
+        schedule();
+        set_thread_flag(TIF_RESTORE_SIGMASK);
+        return -ERESTARTNOHAND;
 }
 
 asmlinkage int
@@ -436,7 +430,7 @@ setup_sigcontext(struct sigcontext __user *sc, struct pt_regs *regs,
         return err;
 }
 
-static void
+static int
 setup_frame(int sig, struct k_sigaction *ka, sigset_t *set,
             struct pt_regs *regs, struct switch_stack * sw)
 {
@@ -481,13 +475,14 @@ setup_frame(int sig, struct k_sigaction *ka, sigset_t *set,
                 current->comm, current->pid, frame, regs->pc, regs->r26);
 #endif
 
-        return;
+        return 0;
 
 give_sigsegv:
         force_sigsegv(sig, current);
+        return -EFAULT;
 }
 
-static void
+static int
 setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
                sigset_t *set, struct pt_regs *regs, struct switch_stack * sw)
 {
@@ -543,34 +538,38 @@ setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
                 current->comm, current->pid, frame, regs->pc, regs->r26);
 #endif
 
-        return;
+        return 0;
 
 give_sigsegv:
         force_sigsegv(sig, current);
+        return -EFAULT;
 }
 
 
 /*
  * OK, we're invoking a handler.
  */
-static inline void
+static inline int
 handle_signal(int sig, struct k_sigaction *ka, siginfo_t *info,
               sigset_t *oldset, struct pt_regs * regs, struct switch_stack *sw)
 {
+        int ret;
+
         if (ka->sa.sa_flags & SA_SIGINFO)
-                setup_rt_frame(sig, ka, info, oldset, regs, sw);
+                ret = setup_rt_frame(sig, ka, info, oldset, regs, sw);
         else
-                setup_frame(sig, ka, oldset, regs, sw);
+                ret = setup_frame(sig, ka, oldset, regs, sw);
 
-        if (ka->sa.sa_flags & SA_RESETHAND)
-                ka->sa.sa_handler = SIG_DFL;
+        if (ret == 0) {
+                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,sig);
+                recalc_sigpending();
+                spin_unlock_irq(&current->sighand->siglock);
+        }
 
-        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,sig);
-        recalc_sigpending();
-        spin_unlock_irq(&current->sighand->siglock);
+        return ret;
 }
 
 static inline void
@@ -611,30 +610,42 @@ syscall_restart(unsigned long r0, unsigned long r19,
  * restart. "r0" is also used as an indicator whether we can restart at
  * all (if we get here from anything but a syscall return, it will be 0)
  */
-static int
-do_signal(sigset_t *oldset, struct pt_regs * regs, struct switch_stack * sw,
+static void
+do_signal(struct pt_regs * regs, struct switch_stack * sw,
           unsigned long r0, unsigned long r19)
 {
         siginfo_t info;
         int signr;
         unsigned long single_stepping = ptrace_cancel_bpt(current);
         struct k_sigaction ka;
+        sigset_t *oldset;
 
-        if (!oldset)
+        if (test_thread_flag(TIF_RESTORE_SIGMASK))
+                oldset = &current->saved_sigmask;
+        else
                 oldset = &current->blocked;
 
         /* This lets the debugger run, ... */
         signr = get_signal_to_deliver(&info, &ka, regs, NULL);
+
         /* ... so re-check the single stepping. */
         single_stepping |= ptrace_cancel_bpt(current);
 
         if (signr > 0) {
                 /* Whee!  Actually deliver the signal.  */
-                if (r0) syscall_restart(r0, r19, regs, &ka);
-                handle_signal(signr, &ka, &info, oldset, regs, sw);
+                if (r0)
+                        syscall_restart(r0, r19, regs, &ka);
+                if (handle_signal(signr, &ka, &info, oldset, regs, sw) == 0) {
+                        /* A signal was successfully delivered, and the
+                           saved sigmask was stored on the signal frame,
+                           and will be restored by sigreturn.  So we can
+                           simply clear the restore sigmask flag.  */
+                        if (test_thread_flag(TIF_RESTORE_SIGMASK))
+                                clear_thread_flag(TIF_RESTORE_SIGMASK);
+                }
                 if (single_stepping) 
                         ptrace_set_bpt(current); /* re-set bpt */
-                return 1;
+                return;
         }
 
         if (r0) {
@@ -654,17 +665,22 @@ do_signal(sigset_t *oldset, struct pt_regs * regs, struct switch_stack * sw,
                         break;
                 }
         }
+
+        /* If there's no signal to deliver, we just restore the saved mask.  */
+        if (test_thread_flag(TIF_RESTORE_SIGMASK)) {
+                clear_thread_flag(TIF_RESTORE_SIGMASK);
+                sigprocmask(SIG_SETMASK, &current->saved_sigmask, NULL);
+        }
+
         if (single_stepping)
                 ptrace_set_bpt(current);        /* re-set breakpoint */
-
-        return 0;
 }
 
 void
-do_notify_resume(sigset_t *oldset, struct pt_regs *regs,
-                 struct switch_stack *sw, unsigned long r0,
-                 unsigned long r19, unsigned long thread_info_flags)
+do_notify_resume(struct pt_regs *regs, struct switch_stack *sw,
+                 unsigned long thread_info_flags,
+                 unsigned long r0, unsigned long r19)
 {
-        if (thread_info_flags & _TIF_SIGPENDING)
-                do_signal(oldset, regs, sw, r0, r19);
+        if (thread_info_flags & (_TIF_SIGPENDING | _TIF_RESTORE_SIGMASK))
+                do_signal(regs, sw, r0, r19);
 }
diff --git a/arch/alpha/kernel/systbls.S b/arch/alpha/kernel/systbls.S
index f6cfe8ce3f9..79de99e32c3 100644
--- a/arch/alpha/kernel/systbls.S
+++ b/arch/alpha/kernel/systbls.S
@@ -465,6 +465,38 @@ sys_call_table:
         .quad sys_inotify_init
         .quad sys_inotify_add_watch             /* 445 */
         .quad sys_inotify_rm_watch
+        .quad sys_fdatasync
+        .quad sys_kexec_load
+        .quad sys_migrate_pages
+        .quad sys_openat                        /* 450 */
+        .quad sys_mkdirat
+        .quad sys_mknodat
+        .quad sys_fchownat
+        .quad sys_futimesat
+        .quad sys_fstatat64                     /* 455 */
+        .quad sys_unlinkat
+        .quad sys_renameat
+        .quad sys_linkat
+        .quad sys_symlinkat
+        .quad sys_readlinkat                    /* 460 */
+        .quad sys_fchmodat
+        .quad sys_faccessat
+        .quad sys_pselect6
+        .quad sys_ppoll
+        .quad sys_unshare                       /* 465 */
+        .quad sys_set_robust_list
+        .quad sys_get_robust_list
+        .quad sys_splice
+        .quad sys_sync_file_range
+        .quad sys_tee                           /* 470 */
+        .quad sys_vmsplice
+        .quad sys_move_pages
+        .quad sys_getcpu
+        .quad sys_epoll_pwait
+        .quad sys_utimensat                     /* 475 */
+        .quad sys_signalfd
+        .quad sys_timerfd
+        .quad sys_eventfd
 
         .size sys_call_table, . - sys_call_table
         .type sys_call_table, @object
diff --git a/include/asm-alpha/thread_info.h b/include/asm-alpha/thread_info.h
index f4defc2bd3f..48a22e3e6f3 100644
--- a/include/asm-alpha/thread_info.h
+++ b/include/asm-alpha/thread_info.h
@@ -76,12 +76,14 @@ register struct thread_info *__current_thread_info __asm__("$8");
 #define TIF_UAC_NOFIX           7
 #define TIF_UAC_SIGBUS          8
 #define TIF_MEMDIE              9
+#define TIF_RESTORE_SIGMASK     10      /* restore signal mask in do_signal */
 
 #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_POLLING_NRFLAG     (1<<TIF_POLLING_NRFLAG)
+#define _TIF_RESTORE_SIGMASK    (1<<TIF_RESTORE_SIGMASK)
 
 /* Work to do on interrupt/exception return.  */
 #define _TIF_WORK_MASK          (_TIF_NOTIFY_RESUME     \
diff --git a/include/asm-alpha/unistd.h b/include/asm-alpha/unistd.h
index e58a427012d..29bf2fdc91c 100644
--- a/include/asm-alpha/unistd.h
+++ b/include/asm-alpha/unistd.h
@@ -233,6 +233,20 @@
 #define __NR_osf_memcntl        260     /* not implemented */
 #define __NR_osf_fdatasync      261     /* not implemented */
 
+/*
+ * Ignore legacy syscalls that we don't use.
+ */
+#define __IGNORE_alarm
+#define __IGNORE_creat
+#define __IGNORE_getegid
+#define __IGNORE_geteuid
+#define __IGNORE_getgid
+#define __IGNORE_getpid
+#define __IGNORE_getppid
+#define __IGNORE_getuid
+#define __IGNORE_pause
+#define __IGNORE_time
+#define __IGNORE_utime
 
 /*
  * Linux-specific system calls begin at 300
@@ -387,10 +401,42 @@
 #define __NR_inotify_init               444
 #define __NR_inotify_add_watch          445
 #define __NR_inotify_rm_watch           446
+#define __NR_fdatasync                  447
+#define __NR_kexec_load                 448
+#define __NR_migrate_pages              449
+#define __NR_openat                     450
+#define __NR_mkdirat                    451
+#define __NR_mknodat                    452
+#define __NR_fchownat                   453
+#define __NR_futimesat                  454
+#define __NR_fstatat64                  455
+#define __NR_unlinkat                   456
+#define __NR_renameat                   457
+#define __NR_linkat                     458
+#define __NR_symlinkat                  459
+#define __NR_readlinkat                 460
+#define __NR_fchmodat                   461
+#define __NR_faccessat                  462
+#define __NR_pselect6                   463
+#define __NR_ppoll                      464
+#define __NR_unshare                    465
+#define __NR_set_robust_list            466
+#define __NR_get_robust_list            467
+#define __NR_splice                     468
+#define __NR_sync_file_range            469
+#define __NR_tee                        470
+#define __NR_vmsplice                   471
+#define __NR_move_pages                 472
+#define __NR_getcpu                     473
+#define __NR_epoll_pwait                474
+#define __NR_utimensat                  475
+#define __NR_signalfd                   476
+#define __NR_timerfd                    477
+#define __NR_eventfd                    478
 
 #ifdef __KERNEL__
 
-#define NR_SYSCALLS                     447
+#define NR_SYSCALLS                     479
 
 #define __ARCH_WANT_IPC_PARSE_VERSION
 #define __ARCH_WANT_OLD_READDIR