Merge branch 'for-arm' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/signal...

[linux-drm-fsl-dcu.git] / arch / arm / kernel / signal.c

diff --git a/arch/arm/kernel/signal.c b/arch/arm/kernel/signal.c
index 73d9a420850def55f6ea65cc1b00aa85c6d3245f..b7ffda1ad8f23d278609a3ca4992ed05f337a36f 100644 (file)
--- a/arch/arm/kernel/signal.c
+++ b/arch/arm/kernel/signal.c
@@ -29,7 +29,6 @@
  */
 #define SWI_SYS_SIGRETURN      (0xef000000|(__NR_sigreturn)|(__NR_OABI_SYSCALL_BASE))
 #define SWI_SYS_RT_SIGRETURN   (0xef000000|(__NR_rt_sigreturn)|(__NR_OABI_SYSCALL_BASE))
-#define SWI_SYS_RESTART                (0xef000000|__NR_restart_syscall|__NR_OABI_SYSCALL_BASE)
 
 /*
  * With EABI, the syscall number has to be loaded into r7.
@@ -49,18 +48,6 @@ const unsigned long sigreturn_codes[7] = {
        MOV_R7_NR_RT_SIGRETURN, SWI_SYS_RT_SIGRETURN, SWI_THUMB_RT_SIGRETURN,
 };
 
-/*
- * Either we support OABI only, or we have EABI with the OABI
- * compat layer enabled.  In the later case we don't know if
- * user space is EABI or not, and if not we must not clobber r7.
- * Always using the OABI syscall solves that issue and works for
- * all those cases.
- */
-const unsigned long syscall_restart_code[2] = {
-       SWI_SYS_RESTART,        /* swi  __NR_restart_syscall */
-       0xe49df004,             /* ldr  pc, [sp], #4 */
-};
-
 /*
  * atomically swap in the new signal mask, and wait for a signal.
  */
@@ -91,10 +78,10 @@ sys_sigaction(int sig, const struct old_sigaction __user *act,
                old_sigset_t mask;
                if (!access_ok(VERIFY_READ, act, sizeof(*act)) ||
                    __get_user(new_ka.sa.sa_handler, &act->sa_handler) ||
-                   __get_user(new_ka.sa.sa_restorer, &act->sa_restorer))
+                   __get_user(new_ka.sa.sa_restorer, &act->sa_restorer) ||
+                   __get_user(new_ka.sa.sa_flags, &act->sa_flags) ||
+                   __get_user(mask, &act->sa_mask))
                        return -EFAULT;
-               __get_user(new_ka.sa.sa_flags, &act->sa_flags);
-               __get_user(mask, &act->sa_mask);
                siginitset(&new_ka.sa.sa_mask, mask);
        }
 
@@ -103,10 +90,10 @@ sys_sigaction(int sig, const struct old_sigaction __user *act,
        if (!ret && oact) {
                if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)) ||
                    __put_user(old_ka.sa.sa_handler, &oact->sa_handler) ||
-                   __put_user(old_ka.sa.sa_restorer, &oact->sa_restorer))
+                   __put_user(old_ka.sa.sa_restorer, &oact->sa_restorer) ||
+                   __put_user(old_ka.sa.sa_flags, &oact->sa_flags) ||
+                   __put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask))
                        return -EFAULT;
-               __put_user(old_ka.sa.sa_flags, &oact->sa_flags);
-               __put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask);
        }
 
        return ret;
@@ -610,15 +597,6 @@ static void do_signal(struct pt_regs *regs, int syscall)
        siginfo_t info;
        int signr;
 
-       /*
-        * We want the common case to go fast, which
-        * is why we may in certain cases get here from
-        * kernel mode. Just return without doing anything
-        * if so.
-        */
-       if (!user_mode(regs))
-               return;
-
        /*
         * If we were from a system call, check for system call restarting...
         */
@@ -635,18 +613,13 @@ static void do_signal(struct pt_regs *regs, int syscall)
                case -ERESTARTNOHAND:
                case -ERESTARTSYS:
                case -ERESTARTNOINTR:
+               case -ERESTART_RESTARTBLOCK:
                        regs->ARM_r0 = regs->ARM_ORIG_r0;
                        regs->ARM_pc = restart_addr;
                        break;
-               case -ERESTART_RESTARTBLOCK:
-                       regs->ARM_r0 = -EINTR;
-                       break;
                }
        }
 
-       if (try_to_freeze())
-               goto no_signal;
-
        /*
         * Get the signal to deliver.  When running under ptrace, at this
         * point the debugger may change all our registers ...
@@ -661,12 +634,14 @@ static void do_signal(struct pt_regs *regs, int syscall)
                 * debugger has chosen to restart at a different PC.
                 */
                if (regs->ARM_pc == restart_addr) {
-                       if (retval == -ERESTARTNOHAND
+                       if (retval == -ERESTARTNOHAND ||
+                           retval == -ERESTART_RESTARTBLOCK
                            || (retval == -ERESTARTSYS
                                && !(ka.sa.sa_flags & SA_RESTART))) {
                                regs->ARM_r0 = -EINTR;
                                regs->ARM_pc = continue_addr;
                        }
+                       clear_thread_flag(TIF_SYSCALL_RESTARTSYS);
                }
 
                if (test_thread_flag(TIF_RESTORE_SIGMASK))
@@ -686,7 +661,6 @@ static void do_signal(struct pt_regs *regs, int syscall)
                return;
        }
 
- no_signal:
        if (syscall) {
                /*
                 * Handle restarting a different system call.  As above,
@@ -694,38 +668,15 @@ static void do_signal(struct pt_regs *regs, int syscall)
                 * ignore the restart.
                 */
                if (retval == -ERESTART_RESTARTBLOCK
-                   && regs->ARM_pc == continue_addr) {
-                       if (thumb_mode(regs)) {
-                               regs->ARM_r7 = __NR_restart_syscall - __NR_SYSCALL_BASE;
-                               regs->ARM_pc -= 2;
-                       } else {
-#if defined(CONFIG_AEABI) && !defined(CONFIG_OABI_COMPAT)
-                               regs->ARM_r7 = __NR_restart_syscall;
-                               regs->ARM_pc -= 4;
-#else
-                               u32 __user *usp;
-
-                               regs->ARM_sp -= 4;
-                               usp = (u32 __user *)regs->ARM_sp;
-
-                               if (put_user(regs->ARM_pc, usp) == 0) {
-                                       regs->ARM_pc = KERN_RESTART_CODE;
-                               } else {
-                                       regs->ARM_sp += 4;
-                                       force_sigsegv(0, current);
-                               }
-#endif
-                       }
-               }
-
-               /* If there's no signal to deliver, we just put the saved sigmask
-                * back.
-                */
-               if (test_thread_flag(TIF_RESTORE_SIGMASK)) {
-                       clear_thread_flag(TIF_RESTORE_SIGMASK);
-                       sigprocmask(SIG_SETMASK, &current->saved_sigmask, NULL);
-               }
+                   && regs->ARM_pc == restart_addr)
+                       set_thread_flag(TIF_SYSCALL_RESTARTSYS);
        }
+
+       /* If there's no signal to deliver, we just put the saved sigmask
+        * back.
+        */
+       if (test_and_clear_thread_flag(TIF_RESTORE_SIGMASK))
+               set_current_blocked(&current->saved_sigmask);
 }
 
 asmlinkage void