1 files changed, 54 insertions, 63 deletions

diff --git a/arch/x86/kernel/signal.c b/arch/x86/kernel/signal.c
index 7cdcd16885ed..d2cc6428c587 100644
--- a/arch/x86/kernel/signal.c
+++ b/arch/x86/kernel/signal.c
@@ -187,40 +187,35 @@ setup_sigcontext(struct sigcontext __user *sc, void __user *fpstate,
 /*
  * Set up a signal frame.
  */
-#ifdef CONFIG_X86_32
-static const struct {
-        u16 poplmovl;
-        u32 val;
-        u16 int80;
-} __attribute__((packed)) retcode = {
-        0xb858,         /* popl %eax; movl $..., %eax */
-        __NR_sigreturn,
-        0x80cd,         /* int $0x80 */
-};
-
-static const struct {
-        u8  movl;
-        u32 val;
-        u16 int80;
-        u8  pad;
-} __attribute__((packed)) rt_retcode = {
-        0xb8,           /* movl $..., %eax */
-        __NR_rt_sigreturn,
-        0x80cd,         /* int $0x80 */
-        0
-};
 
 /*
  * 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 **fpstate)
+             void __user **fpstate)
 {
-        unsigned long sp;
-
         /* Default to using normal stack */
-        sp = regs->sp;
+        unsigned long sp = regs->sp;
+
+#ifdef CONFIG_X86_64
+        /* redzone */
+        sp -= 128;
+#endif /* CONFIG_X86_64 */
 
         /*
          * If we are on the alternate signal stack and would overflow it, don't.
@@ -234,30 +229,52 @@ get_sigframe(struct k_sigaction *ka, struct pt_regs *regs, size_t frame_size,
                 if (sas_ss_flags(sp) == 0)
                         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 = sp - sig_xstate_size;
-                *fpstate = (struct _fpstate *) sp;
+                sp -= sig_xstate_size;
+#ifdef CONFIG_X86_64
+                sp = round_down(sp, 64);
+#endif /* CONFIG_X86_64 */
+                *fpstate = (void __user *)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;
+        return (void __user *)align_sigframe(sp - frame_size);
 }
 
+#ifdef CONFIG_X86_32
+static const struct {
+        u16 poplmovl;
+        u32 val;
+        u16 int80;
+} __attribute__((packed)) retcode = {
+        0xb858,         /* popl %eax; movl $..., %eax */
+        __NR_sigreturn,
+        0x80cd,         /* int $0x80 */
+};
+
+static const struct {
+        u8  movl;
+        u32 val;
+        u16 int80;
+        u8  pad;
+} __attribute__((packed)) rt_retcode = {
+        0xb8,           /* movl $..., %eax */
+        __NR_rt_sigreturn,
+        0x80cd,         /* int $0x80 */
+        0
+};
+
 static int
 __setup_frame(int sig, struct k_sigaction *ka, sigset_t *set,
               struct pt_regs *regs)
@@ -388,24 +405,6 @@ 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 +413,7 @@ 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;