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authorAndreas Schwab <schwab@suse.de>2008-12-29 19:34:57 +0100
committerGeert Uytterhoeven <geert@linux-m68k.org>2009-01-12 20:56:43 +0100
commitc162564ebf001e79448e8aa7a6e0ffee00b55f74 (patch)
tree5a767647c24ff5388726a00fa370013a24577e3a /arch
parent1fa0b29f3a43f9dd8080d24cd16790b15ef963f5 (diff)
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>
Diffstat (limited to 'arch')
-rw-r--r--arch/m68k/kernel/entry.S2
-rw-r--r--arch/m68k/kernel/signal.c15
2 files changed, 16 insertions, 1 deletions
diff --git a/arch/m68k/kernel/entry.S b/arch/m68k/kernel/entry.S
index f28404d9a2bc..5b780826647c 100644
--- 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 f9af893cd289..de2d05ddd86d 100644
--- 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;