x86: signal: unify get_sigframe()

Impact: cleanup

Unify get_sigframe().

Signed-off-by: Hiroshi Shimamoto <h-shimamoto@ct.jp.nec.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

diff --git a/arch/x86/kernel/signal.c b/arch/x86/kernel/signal.c
index 89ef90d..53425c6 100644 (file)
--- a/arch/x86/kernel/signal.c
+++ b/arch/x86/kernel/signal.c
@@ -187,28 +187,6 @@ 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..
@@ -217,10 +195,13 @@ static inline void __user *
 get_sigframe(struct k_sigaction *ka, struct pt_regs *regs, size_t frame_size,
             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 +215,64 @@ 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;
+               sp -= sig_xstate_size;
+#ifdef CONFIG_X86_32
                *fpstate = (void __user *) sp;
+#else /* !CONFIG_X86_32 */
+               *fpstate = (void __user *)round_down(sp, 64);
+#endif /* CONFIG_X86_32 */
+
                if (save_i387_xstate(*fpstate) < 0)
                        return (void __user *)-1L;
        }
 
        sp -= frame_size;
+#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 (void __user *) sp;
 }
 
+#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)
@@ -388,36 +403,6 @@ 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_sigframe(struct k_sigaction *ka, struct pt_regs *regs, size_t frame_size,
-            void __user **fpstate)
-{
-       unsigned long sp;
-
-       /* Default to using normal stack - redzone */
-       sp = regs->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;
-       }
-
-       if (used_math()) {
-               sp -= sig_xstate_size;
-               *fpstate = (void __user *)round_down(sp, 64);
-
-               if (save_i387_xstate(*fpstate) < 0)
-                       return (void __user *) -1L;
-       }
-
-       sp -= frame_size;
-       return (void __user *)round_down(sp, 16) - 8;
-}
-
 static int __setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
                            sigset_t *set, struct pt_regs *regs)
 {