m68k: Wire up sys_restart_syscall

Make restart blocks working, required for proper syscall restarting.

Signed-off-by: Andreas Schwab <schwab@suse.de>
Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>

diff --git a/arch/m68k/kernel/entry.S b/arch/m68k/kernel/entry.S
index f28404d9a2bc3594438904f9b23bf97112534b63..5b780826647cce7e90bedfc8243c302c91ffaa71 100644 (file)
--- a/arch/m68k/kernel/entry.S
+++ b/arch/m68k/kernel/entry.S
@@ -424,7 +424,7 @@ resume:
 .data
 ALIGN
 sys_call_table:
-       .long sys_ni_syscall    /* 0  -  old "setup()" system call*/
+       .long sys_restart_syscall       /* 0 - old "setup()" system call, used for restarting */
        .long sys_exit
        .long sys_fork
        .long sys_read

diff --git a/arch/m68k/kernel/signal.c b/arch/m68k/kernel/signal.c
index f9af893cd2892dde83b6e089d370d093f6db2ac0..de2d05ddd86d9d8ca6c7699f3d93d9ca0ad05861 100644 (file)
--- a/arch/m68k/kernel/signal.c
+++ b/arch/m68k/kernel/signal.c
@@ -326,6 +326,9 @@ restore_sigcontext(struct pt_regs *regs, struct sigcontext __user *usc, void __u
        struct sigcontext context;
        int err;
 
+       /* 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;
@@ -411,6 +414,9 @@ 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;
@@ -937,6 +943,15 @@ 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/include/asm-m68k/unistd.h b/include/asm-m68k/unistd.h
index 965abb8bc7ff7297d565ad1d2c710acb05373baa..3c19027331faa0cc9d1ec9a6195096a112434a2a 100644 (file)
--- a/include/asm-m68k/unistd.h
+++ b/include/asm-m68k/unistd.h
@@ -5,6 +5,7 @@
  * This file contains the system call numbers.
  */
 
+#define __NR_restart_syscall     0
 #define __NR_exit                1
 #define __NR_fork                2
 #define __NR_read                3
@@ -359,9 +360,6 @@
 #define __ARCH_WANT_SYS_SIGPROCMASK
 #define __ARCH_WANT_SYS_RT_SIGACTION
 
-/* whitelist for checksyscalls */
-#define __IGNORE_restart_syscall
-
 /*
  * "Conditional" syscalls
  *