Merge branch 'linus' into perfcounters/core-v2

[pandora-kernel.git] / arch / x86 / kernel / signal.c

diff --git a/arch/x86/kernel/signal.c b/arch/x86/kernel/signal.c
index 4d34410..611615a 100644 (file)
--- a/arch/x86/kernel/signal.c
+++ b/arch/x86/kernel/signal.c
@@ -187,6 +187,77 @@ setup_sigcontext(struct sigcontext __user *sc, void __user *fpstate,
 /*
  * Set up a signal frame.
  */
+
+/*
+ * Determine which stack to use..
+ */
+static unsigned long align_sigframe(unsigned long sp)
+{
+#ifdef CONFIG_X86_32
+       /*
+        * Align the stack pointer according to the i386 ABI,
+        * i.e. so that on function entry ((sp + 4) & 15) == 0.
+        */
+       sp = ((sp + 4) & -16ul) - 4;
+#else /* !CONFIG_X86_32 */
+       sp = round_down(sp, 16) - 8;
+#endif
+       return sp;
+}
+
+static inline void __user *
+get_sigframe(struct k_sigaction *ka, struct pt_regs *regs, size_t frame_size,
+            void __user **fpstate)
+{
+       /* Default to using normal stack */
+       unsigned long sp = regs->sp;
+       int onsigstack = on_sig_stack(sp);
+
+#ifdef CONFIG_X86_64
+       /* redzone */
+       sp -= 128;
+#endif /* CONFIG_X86_64 */
+
+       if (!onsigstack) {
+               /* This is the X/Open sanctioned signal stack switching.  */
+               if (ka->sa.sa_flags & SA_ONSTACK) {
+                       if (current->sas_ss_size)
+                               sp = current->sas_ss_sp + current->sas_ss_size;
+               } else {
+#ifdef CONFIG_X86_32
+                       /* This is the legacy signal stack switching. */
+                       if ((regs->ss & 0xffff) != __USER_DS &&
+                               !(ka->sa.sa_flags & SA_RESTORER) &&
+                                       ka->sa.sa_restorer)
+                               sp = (unsigned long) ka->sa.sa_restorer;
+#endif /* CONFIG_X86_32 */
+               }
+       }
+
+       if (used_math()) {
+               sp -= sig_xstate_size;
+#ifdef CONFIG_X86_64
+               sp = round_down(sp, 64);
+#endif /* CONFIG_X86_64 */
+               *fpstate = (void __user *)sp;
+       }
+
+       sp = align_sigframe(sp - frame_size);
+
+       /*
+        * If we are on the alternate signal stack and would overflow it, don't.
+        * Return an always-bogus address instead so we will die with SIGSEGV.
+        */
+       if (onsigstack && !likely(on_sig_stack(sp)))
+               return (void __user *)-1L;
+
+       /* save i387 state */
+       if (used_math() && save_i387_xstate(*fpstate) < 0)
+               return (void __user *)-1L;
+
+       return (void __user *)sp;
+}
+
 #ifdef CONFIG_X86_32
 static const struct {
        u16 poplmovl;
@@ -210,54 +281,6 @@ static const struct {
        0
 };
 
-/*
- * Determine which stack to use..
- */
-static inline void __user *
-get_sigframe(struct k_sigaction *ka, struct pt_regs *regs, size_t frame_size,
-            void **fpstate)
-{
-       unsigned long sp;
-
-       /* Default to using normal stack */
-       sp = regs->sp;
-
-       /*
-        * If we are on the alternate signal stack and would overflow it, don't.
-        * Return an always-bogus address instead so we will die with SIGSEGV.
-        */
-       if (on_sig_stack(sp) && !likely(on_sig_stack(sp - frame_size)))
-               return (void __user *) -1L;
-
-       /* This is the X/Open sanctioned signal stack switching.  */
-       if (ka->sa.sa_flags & SA_ONSTACK) {
-               if (sas_ss_flags(sp) == 0)
-                       sp = current->sas_ss_sp + current->sas_ss_size;
-       } else {
-               /* This is the legacy signal stack switching. */
-               if ((regs->ss & 0xffff) != __USER_DS &&
-                       !(ka->sa.sa_flags & SA_RESTORER) &&
-                               ka->sa.sa_restorer)
-                       sp = (unsigned long) ka->sa.sa_restorer;
-       }
-
-       if (used_math()) {
-               sp = sp - sig_xstate_size;
-               *fpstate = (struct _fpstate *) sp;
-               if (save_i387_xstate(*fpstate) < 0)
-                       return (void __user *)-1L;
-       }
-
-       sp -= frame_size;
-       /*
-        * Align the stack pointer according to the i386 ABI,
-        * i.e. so that on function entry ((sp + 4) & 15) == 0.
-        */
-       sp = ((sp + 4) & -16ul) - 4;
-
-       return (void __user *) sp;
-}
-
 static int
 __setup_frame(int sig, struct k_sigaction *ka, sigset_t *set,
              struct pt_regs *regs)
@@ -388,24 +411,6 @@ static int __setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
        return 0;
 }
 #else /* !CONFIG_X86_32 */
-/*
- * Determine which stack to use..
- */
-static void __user *
-get_stack(struct k_sigaction *ka, unsigned long sp, unsigned long size)
-{
-       /* Default to using normal stack - redzone*/
-       sp -= 128;
-
-       /* This is the X/Open sanctioned signal stack switching.  */
-       if (ka->sa.sa_flags & SA_ONSTACK) {
-               if (sas_ss_flags(sp) == 0)
-                       sp = current->sas_ss_sp + current->sas_ss_size;
-       }
-
-       return (void __user *)round_down(sp - size, 64);
-}
-
 static int __setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
                            sigset_t *set, struct pt_regs *regs)
 {
@@ -414,15 +419,7 @@ static int __setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
        int err = 0;
        struct task_struct *me = current;
 
-       if (used_math()) {
-               fp = get_stack(ka, regs->sp, sig_xstate_size);
-               frame = (void __user *)round_down(
-                       (unsigned long)fp - sizeof(struct rt_sigframe), 16) - 8;
-
-               if (save_i387_xstate(fp) < 0)
-                       return -EFAULT;
-       } else
-               frame = get_stack(ka, regs->sp, sizeof(struct rt_sigframe)) - 8;
+       frame = get_sigframe(ka, regs, sizeof(struct rt_sigframe), &fp);
 
        if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
                return -EFAULT;