Merge branch 'signal-cleanup' of git://git.kernel.org/pub/scm/linux/kernel/git/rw/misc

Pull arch signal handling cleanup from Richard Weinberger:
 "This patch series moves all remaining archs to the get_signal(),
  signal_setup_done() and sigsp() functions.

  Currently these archs use open coded variants of the said functions.
  Further, unused parameters get removed from get_signal_to_deliver(),
  tracehook_signal_handler() and signal_delivered().

  At the end of the day we save around 500 lines of code."

* 'signal-cleanup' of git://git.kernel.org/pub/scm/linux/kernel/git/rw/misc: (43 commits)
  powerpc: Use sigsp()
  openrisc: Use sigsp()
  mn10300: Use sigsp()
  mips: Use sigsp()
  microblaze: Use sigsp()
  metag: Use sigsp()
  m68k: Use sigsp()
  m32r: Use sigsp()
  hexagon: Use sigsp()
  frv: Use sigsp()
  cris: Use sigsp()
  c6x: Use sigsp()
  blackfin: Use sigsp()
  avr32: Use sigsp()
  arm64: Use sigsp()
  arc: Use sigsp()
  sas_ss_flags: Remove nested ternary if
  Rip out get_signal_to_deliver()
  Clean up signal_delivered()
  tracehook_signal_handler: Remove sig, info, ka and regs
  ...

1 files changed, 20 insertions, 33 deletions

diff --git a/arch/c6x/kernel/signal.c b/arch/c6x/kernel/signal.c
index 3998b24e26f2..fe68226f6c4d 100644
--- a/arch/c6x/kernel/signal.c
+++ b/arch/c6x/kernel/signal.c
@@ -127,17 +127,11 @@ static int setup_sigcontext(struct sigcontext __user *sc, struct pt_regs *regs,
         return err;
 }
 
-static inline void __user *get_sigframe(struct k_sigaction *ka,
+static inline void __user *get_sigframe(struct ksignal *ksig,
                                         struct pt_regs *regs,
                                         unsigned long framesize)
 {
-        unsigned long sp = regs->sp;
-
-        /*
-         * This is the X/Open sanctioned signal stack switching.
-         */
-        if ((ka->sa.sa_flags & SA_ONSTACK) && sas_ss_flags(sp) == 0)
-                sp = current->sas_ss_sp + current->sas_ss_size;
+        unsigned long sp = sigsp(regs->sp, ksig);
 
         /*
          * No matter what happens, 'sp' must be dword
@@ -146,21 +140,21 @@ static inline void __user *get_sigframe(struct k_sigaction *ka,
         return (void __user *)((sp - framesize) & ~7);
 }
 
-static int setup_rt_frame(int signr, struct k_sigaction *ka, siginfo_t *info,
-                           sigset_t *set, struct pt_regs *regs)
+static int setup_rt_frame(struct ksignal *ksig, sigset_t *set,
+                          struct pt_regs *regs)
 {
         struct rt_sigframe __user *frame;
         unsigned long __user *retcode;
         int err = 0;
 
-        frame = get_sigframe(ka, regs, sizeof(*frame));
+        frame = get_sigframe(ksig, regs, sizeof(*frame));
 
         if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
-                goto segv_and_exit;
+                return -EFAULT;
 
         err |= __put_user(&frame->info, &frame->pinfo);
         err |= __put_user(&frame->uc, &frame->puc);
-        err |= copy_siginfo_to_user(&frame->info, info);
+        err |= copy_siginfo_to_user(&frame->info, &ksig->info);
 
         /* Clear all the bits of the ucontext we don't use.  */
         err |= __clear_user(&frame->uc, offsetof(struct ucontext, uc_mcontext));
@@ -188,7 +182,7 @@ static int setup_rt_frame(int signr, struct k_sigaction *ka, siginfo_t *info,
 #undef COPY
 
         if (err)
-                goto segv_and_exit;
+                return -EFAULT;
 
         flush_icache_range((unsigned long) &frame->retcode,
                            (unsigned long) &frame->retcode + RETCODE_SIZE);
@@ -198,10 +192,10 @@ static int setup_rt_frame(int signr, struct k_sigaction *ka, siginfo_t *info,
         /* Change user context to branch to signal handler */
         regs->sp = (unsigned long) frame - 8;
         regs->b3 = (unsigned long) retcode;
-        regs->pc = (unsigned long) ka->sa.sa_handler;
+        regs->pc = (unsigned long) ksig->ka.sa.sa_handler;
 
         /* Give the signal number to the handler */
-        regs->a4 = signr;
+        regs->a4 = ksig->sig;
 
         /*
          * For realtime signals we must also set the second and third
@@ -212,10 +206,6 @@ static int setup_rt_frame(int signr, struct k_sigaction *ka, siginfo_t *info,
         regs->a6 = (unsigned long)&frame->uc;
 
         return 0;
-
-segv_and_exit:
-        force_sigsegv(signr, current);
-        return -EFAULT;
 }
 
 static inline void
@@ -245,10 +235,11 @@ do_restart:
 /*
  * handle the actual delivery of a signal to userspace
  */
-static void handle_signal(int sig,
-                         siginfo_t *info, struct k_sigaction *ka,
-                         struct pt_regs *regs, int syscall)
+static void handle_signal(struct ksignal *ksig, struct pt_regs *regs,
+                          int syscall)
 {
+        int ret;
+
         /* Are we from a system call? */
         if (syscall) {
                 /* If so, check system call restarting.. */
@@ -259,7 +250,7 @@ static void handle_signal(int sig,
                         break;
 
                 case -ERESTARTSYS:
-                        if (!(ka->sa.sa_flags & SA_RESTART)) {
+                        if (!(ksig->ka.sa.sa_flags & SA_RESTART)) {
                                 regs->a4 = -EINTR;
                                 break;
                         }
@@ -272,9 +263,8 @@ static void handle_signal(int sig,
         }
 
         /* Set up the stack frame */
-        if (setup_rt_frame(sig, ka, info, sigmask_to_save(), regs) < 0)
-                return;
-        signal_delivered(sig, info, ka, regs, 0);
+        ret = setup_rt_frame(ksig, sigmask_to_save(), regs);
+        signal_setup_done(ret, ksig, 0);
 }
 
 /*
@@ -282,18 +272,15 @@ static void handle_signal(int sig,
  */
 static void do_signal(struct pt_regs *regs, int syscall)
 {
-        struct k_sigaction ka;
-        siginfo_t info;
-        int signr;
+        struct ksignal ksig;
 
         /* we want the common case to go fast, which is why we may in certain
          * cases get here from kernel mode */
         if (!user_mode(regs))
                 return;
 
-        signr = get_signal_to_deliver(&info, &ka, regs, NULL);
-        if (signr > 0) {
-                handle_signal(signr, &info, &ka, regs, syscall);
+        if (get_signal(&ksig)) {
+                handle_signal(&ksig, regs, syscall);
                 return;
         }