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m68k: Wire up sys_restart_syscall

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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>
This commit is contained in:
Andreas Schwab 2008-12-29 19:34:57 +01:00 committed by Geert Uytterhoeven
parent 1fa0b29f3a
commit c162564ebf
3 changed files with 17 additions and 4 deletions
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2
arch/m68k/kernel/entry.S
View File

@ -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

15
arch/m68k/kernel/signal.c
View File

@ -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;

4
include/asm-m68k/unistd.h
View File

@ -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
*