m68knommu: fix syscall restarting

Make restart blocks working, required for proper syscall restarting.
Derived from same changes for m68k arch by Andreas Schwab <schwab@suse.de>

Signed-off-by: Greg Ungerer <gerg@uclinux.org>

diff --git a/arch/m68knommu/kernel/signal.c b/arch/m68knommu/kernel/signal.c
index bbfcae9..5ab6a04 100644 (file)
--- a/arch/m68knommu/kernel/signal.c
+++ b/arch/m68knommu/kernel/signal.c
@@ -279,6 +279,9 @@ restore_sigcontext(struct pt_regs *regs, struct sigcontext *usc, void *fp,
        struct sigcontext context;
        int err = 0;
 
+       /* Always make any pending restarted system calls return -EINTR */
+       current_thread_info()->restart_block.fn = do_no_restart_syscall;
+
        /* get previous context */
        if (copy_from_user(&context, usc, sizeof(context)))
                goto badframe;
@@ -316,6 +319,9 @@ rt_restore_ucontext(struct pt_regs *regs, struct switch_stack *sw,
        unsigned long usp;
        int err;
 
+       /* Always make any pending restarted system calls return -EINTR */
+       current_thread_info()->restart_block.fn = do_no_restart_syscall;
+
        err = __get_user(temp, &uc->uc_mcontext.version);
        if (temp != MCONTEXT_VERSION)
                goto badframe;
@@ -692,6 +698,15 @@ handle_restart(struct pt_regs *regs, struct k_sigaction *ka, int has_handler)
                regs->d0 = -EINTR;
                break;
 
+       case -ERESTART_RESTARTBLOCK:
+               if (!has_handler) {
+                       regs->d0 = __NR_restart_syscall;
+                       regs->pc -= 2;
+                       break;
+               }
+               regs->d0 = -EINTR;
+               break;
+
        case -ERESTARTSYS:
                if (has_handler && !(ka->sa.sa_flags & SA_RESTART)) {
                        regs->d0 = -EINTR;

diff --git a/arch/m68knommu/kernel/syscalltable.S b/arch/m68knommu/kernel/syscalltable.S
index 5c3e3f6..1017e76 100644 (file)
--- a/arch/m68knommu/kernel/syscalltable.S
+++ b/arch/m68knommu/kernel/syscalltable.S
@@ -18,7 +18,7 @@
 .text
 ALIGN
 ENTRY(sys_call_table)
-       .long sys_ni_syscall    /* 0  -  old "setup()" system call*/
+       .long sys_restart_syscall       /* 0  -  old "setup()" system call */
        .long sys_exit
        .long sys_fork
        .long sys_read