x86: x86 i387 user_regset

This revamps the i387 code to be shared across 32-bit, 64-bit,
and 32-on-64.  It does so by consolidating the code in one place
based on the user_regset accessor interfaces.  This switches
32-bit to using the i387_64.h header and 64-bit to using the
i387.c that was previously i387_32.c, but that's what took the
least cleanup in each file.  Here i387.h is stubbed to always
include i387_64.h rather than renaming the file, to keep this
diff smaller and easier to read.

Signed-off-by: Roland McGrath <roland@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

1 files changed, 248 insertions, 233 deletions

diff --git a/arch/x86/kernel/i387.c b/arch/x86/kernel/i387.c
index bebe03463461..f7f7568dd7bc 100644
--- a/arch/x86/kernel/i387.c
+++ b/arch/x86/kernel/i387.c
@@ -8,6 +8,7 @@
 
 #include <linux/sched.h>
 #include <linux/module.h>
+#include <linux/regset.h>
 #include <asm/processor.h>
 #include <asm/i387.h>
 #include <asm/math_emu.h>
@@ -16,13 +17,29 @@
 #include <asm/ptrace.h>
 #include <asm/uaccess.h>
 
+#ifdef CONFIG_X86_64
+
+#include <asm/sigcontext32.h>
+#include <asm/user32.h>
+
+#else
+
+#define save_i387_ia32          save_i387
+#define restore_i387_ia32       restore_i387
+
+#define _fpstate_ia32           _fpstate
+#define user_i387_ia32_struct   user_i387_struct
+#define user32_fxsr_struct      user_fxsr_struct
+
+#endif
+
 #ifdef CONFIG_MATH_EMULATION
 #define HAVE_HWFP (boot_cpu_data.hard_math)
 #else
 #define HAVE_HWFP 1
 #endif
 
-static unsigned long mxcsr_feature_mask __read_mostly = 0xffffffff;
+unsigned int mxcsr_feature_mask __read_mostly = 0xffffffffu;
 
 void mxcsr_feature_mask_init(void)
 {
@@ -40,6 +57,30 @@ void mxcsr_feature_mask_init(void)
         stts();
 }
 
+#ifdef CONFIG_X86_64
+/*
+ * Called at bootup to set up the initial FPU state that is later cloned
+ * into all processes.
+ */
+void __cpuinit fpu_init(void)
+{
+        unsigned long oldcr0 = read_cr0();
+        extern void __bad_fxsave_alignment(void);
+
+        if (offsetof(struct task_struct, thread.i387.fxsave) & 15)
+                __bad_fxsave_alignment();
+        set_in_cr4(X86_CR4_OSFXSR);
+        set_in_cr4(X86_CR4_OSXMMEXCPT);
+
+        write_cr0(oldcr0 & ~((1UL<<3)|(1UL<<2))); /* clear TS and EM */
+
+        mxcsr_feature_mask_init();
+        /* clean state in init */
+        current_thread_info()->status = 0;
+        clear_used_math();
+}
+#endif  /* CONFIG_X86_64 */
+
 /*
  * The _current_ task is using the FPU for the first time
  * so initialize it and set the mxcsr to its default
@@ -48,12 +89,18 @@ void mxcsr_feature_mask_init(void)
  */
 void init_fpu(struct task_struct *tsk)
 {
+        if (tsk_used_math(tsk)) {
+                if (tsk == current)
+                        unlazy_fpu(tsk);
+                return;
+        }
+
         if (cpu_has_fxsr) {
                 memset(&tsk->thread.i387.fxsave, 0,
                        sizeof(struct i387_fxsave_struct));
                 tsk->thread.i387.fxsave.cwd = 0x37f;
                 if (cpu_has_xmm)
-                        tsk->thread.i387.fxsave.mxcsr = 0x1f80;
+                        tsk->thread.i387.fxsave.mxcsr = MXCSR_DEFAULT;
         } else {
                 memset(&tsk->thread.i387.fsave, 0,
                        sizeof(struct i387_fsave_struct));
@@ -62,27 +109,59 @@ void init_fpu(struct task_struct *tsk)
                 tsk->thread.i387.fsave.twd = 0xffffffffu;
                 tsk->thread.i387.fsave.fos = 0xffff0000u;
         }
-        /* only the device not available exception
-         * or ptrace can call init_fpu */
+        /*
+         * Only the device not available exception or ptrace can call init_fpu.
+         */
         set_stopped_child_used_math(tsk);
 }
 
-/*
- * FPU lazy state save handling.
- */
+int fpregs_active(struct task_struct *target, const struct user_regset *regset)
+{
+        return tsk_used_math(target) ? regset->n : 0;
+}
 
-void kernel_fpu_begin(void)
+int xfpregs_active(struct task_struct *target, const struct user_regset *regset)
 {
-        struct thread_info *thread = current_thread_info();
+        return (cpu_has_fxsr && tsk_used_math(target)) ? regset->n : 0;
+}
 
-        preempt_disable();
-        if (thread->status & TS_USEDFPU) {
-                __save_init_fpu(thread->task);
-                return;
-        }
-        clts();
+int xfpregs_get(struct task_struct *target, const struct user_regset *regset,
+                unsigned int pos, unsigned int count,
+                void *kbuf, void __user *ubuf)
+{
+        if (!cpu_has_fxsr)
+                return -ENODEV;
+
+        unlazy_fpu(target);
+
+        return user_regset_copyout(&pos, &count, &kbuf, &ubuf,
+                                   &target->thread.i387.fxsave, 0, -1);
 }
-EXPORT_SYMBOL_GPL(kernel_fpu_begin);
+
+int xfpregs_set(struct task_struct *target, const struct user_regset *regset,
+                unsigned int pos, unsigned int count,
+                const void *kbuf, const void __user *ubuf)
+{
+        int ret;
+
+        if (!cpu_has_fxsr)
+                return -ENODEV;
+
+        unlazy_fpu(target);
+        set_stopped_child_used_math(target);
+
+        ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
+                                 &target->thread.i387.fxsave, 0, -1);
+
+        /*
+         * mxcsr reserved bits must be masked to zero for security reasons.
+         */
+        target->thread.i387.fxsave.mxcsr &= mxcsr_feature_mask;
+
+        return ret;
+}
+
+#if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION
 
 /*
  * FPU tag word conversions.
@@ -94,210 +173,187 @@ static inline unsigned short twd_i387_to_fxsr(unsigned short twd)
 
         /* Transform each pair of bits into 01 (valid) or 00 (empty) */
         tmp = ~twd;
-        tmp = (tmp | (tmp >> 1)) & 0x5555; /* 0V0V0V0V0V0V0V0V */
+        tmp = (tmp | (tmp>>1)) & 0x5555; /* 0V0V0V0V0V0V0V0V */
         /* and move the valid bits to the lower byte. */
         tmp = (tmp | (tmp >> 1)) & 0x3333; /* 00VV00VV00VV00VV */
         tmp = (tmp | (tmp >> 2)) & 0x0f0f; /* 0000VVVV0000VVVV */
         tmp = (tmp | (tmp >> 4)) & 0x00ff; /* 00000000VVVVVVVV */
-
         return tmp;
 }
 
-static inline unsigned long twd_fxsr_to_i387(struct i387_fxsave_struct *fxsave)
-{
-        struct _fpxreg *st = NULL;
-        unsigned long tos = (fxsave->swd >> 11) & 7;
-        unsigned long twd = (unsigned long) fxsave->twd;
-        unsigned long tag;
-        unsigned long ret = 0xffff0000u;
-        int i;
-
 #define FPREG_ADDR(f, n)        ((void *)&(f)->st_space + (n) * 16);
+#define FP_EXP_TAG_VALID        0
+#define FP_EXP_TAG_ZERO         1
+#define FP_EXP_TAG_SPECIAL      2
+#define FP_EXP_TAG_EMPTY        3
+
+static inline u32 twd_fxsr_to_i387(struct i387_fxsave_struct *fxsave)
+{
+        struct _fpxreg *st;
+        u32 tos = (fxsave->swd >> 11) & 7;
+        u32 twd = (unsigned long) fxsave->twd;
+        u32 tag;
+        u32 ret = 0xffff0000u;
+        int i;
 
-        for (i = 0; i < 8; i++) {
+        for (i = 0; i < 8; i++, twd >>= 1) {
                 if (twd & 0x1) {
                         st = FPREG_ADDR(fxsave, (i - tos) & 7);
 
                         switch (st->exponent & 0x7fff) {
                         case 0x7fff:
-                                tag = 2;                /* Special */
+                                tag = FP_EXP_TAG_SPECIAL;
                                 break;
                         case 0x0000:
                                 if (!st->significand[0] &&
                                     !st->significand[1] &&
                                     !st->significand[2] &&
-                                    !st->significand[3]) {
-                                        tag = 1;        /* Zero */
-                                } else {
-                                        tag = 2;        /* Special */
-                                }
+                                    !st->significand[3])
+                                        tag = FP_EXP_TAG_ZERO;
+                                else
+                                        tag = FP_EXP_TAG_SPECIAL;
                                 break;
                         default:
-                                if (st->significand[3] & 0x8000) {
-                                        tag = 0;        /* Valid */
-                                } else {
-                                        tag = 2;        /* Special */
-                                }
+                                if (st->significand[3] & 0x8000)
+                                        tag = FP_EXP_TAG_VALID;
+                                else
+                                        tag = FP_EXP_TAG_SPECIAL;
                                 break;
                         }
                 } else {
-                        tag = 3;                        /* Empty */
+                        tag = FP_EXP_TAG_EMPTY;
                 }
-                ret |= (tag << (2 * i));
-                twd = twd >> 1;
+                ret |= tag << (2 * i);
         }
         return ret;
 }
 
 /*
- * FPU state interaction.
+ * FXSR floating point environment conversions.
  */
 
-unsigned short get_fpu_cwd(struct task_struct *tsk)
+static void convert_from_fxsr(struct user_i387_ia32_struct *env,
+                              struct task_struct *tsk)
 {
-        if (cpu_has_fxsr) {
-                return tsk->thread.i387.fxsave.cwd;
-        } else {
-                return (unsigned short)tsk->thread.i387.fsave.cwd;
-        }
-}
+        struct i387_fxsave_struct *fxsave = &tsk->thread.i387.fxsave;
+        struct _fpreg *to = (struct _fpreg *) &env->st_space[0];
+        struct _fpxreg *from = (struct _fpxreg *) &fxsave->st_space[0];
+        int i;
 
-unsigned short get_fpu_swd(struct task_struct *tsk)
-{
-        if (cpu_has_fxsr) {
-                return tsk->thread.i387.fxsave.swd;
+        env->cwd = fxsave->cwd | 0xffff0000u;
+        env->swd = fxsave->swd | 0xffff0000u;
+        env->twd = twd_fxsr_to_i387(fxsave);
+
+#ifdef CONFIG_X86_64
+        env->fip = fxsave->rip;
+        env->foo = fxsave->rdp;
+        if (tsk == current) {
+                /*
+                 * should be actually ds/cs at fpu exception time, but
+                 * that information is not available in 64bit mode.
+                 */
+                asm("mov %%ds,%0" : "=r" (env->fos));
+                asm("mov %%cs,%0" : "=r" (env->fcs));
         } else {
-                return (unsigned short)tsk->thread.i387.fsave.swd;
+                struct pt_regs *regs = task_pt_regs(tsk);
+                env->fos = 0xffff0000 | tsk->thread.ds;
+                env->fcs = regs->cs;
         }
-}
-
-#if 0
-unsigned short get_fpu_twd(struct task_struct *tsk)
-{
-        if (cpu_has_fxsr) {
-                return tsk->thread.i387.fxsave.twd;
-        } else {
-                return (unsigned short)tsk->thread.i387.fsave.twd;
-        }
-}
-#endif  /*  0  */
+#else
+        env->fip = fxsave->fip;
+        env->fcs = fxsave->fcs;
+        env->foo = fxsave->foo;
+        env->fos = fxsave->fos;
+#endif
 
-unsigned short get_fpu_mxcsr(struct task_struct *tsk)
-{
-        if (cpu_has_xmm) {
-                return tsk->thread.i387.fxsave.mxcsr;
-        } else {
-                return 0x1f80;
-        }
+        for (i = 0; i < 8; ++i)
+                memcpy(&to[i], &from[i], sizeof(to[0]));
 }
 
-#if 0
+static void convert_to_fxsr(struct task_struct *tsk,
+                            const struct user_i387_ia32_struct *env)
 
-void set_fpu_cwd(struct task_struct *tsk, unsigned short cwd)
 {
-        if (cpu_has_fxsr) {
-                tsk->thread.i387.fxsave.cwd = cwd;
-        } else {
-                tsk->thread.i387.fsave.cwd = ((long)cwd | 0xffff0000u);
-        }
-}
+        struct i387_fxsave_struct *fxsave = &tsk->thread.i387.fxsave;
+        struct _fpreg *from = (struct _fpreg *) &env->st_space[0];
+        struct _fpxreg *to = (struct _fpxreg *) &fxsave->st_space[0];
+        int i;
 
-void set_fpu_swd(struct task_struct *tsk, unsigned short swd)
-{
-        if (cpu_has_fxsr) {
-                tsk->thread.i387.fxsave.swd = swd;
-        } else {
-                tsk->thread.i387.fsave.swd = ((long)swd | 0xffff0000u);
-        }
-}
+        fxsave->cwd = env->cwd;
+        fxsave->swd = env->swd;
+        fxsave->twd = twd_i387_to_fxsr(env->twd);
+        fxsave->fop = (u16) ((u32) env->fcs >> 16);
+#ifdef CONFIG_X86_64
+        fxsave->rip = env->fip;
+        fxsave->rdp = env->foo;
+        /* cs and ds ignored */
+#else
+        fxsave->fip = env->fip;
+        fxsave->fcs = (env->fcs & 0xffff);
+        fxsave->foo = env->foo;
+        fxsave->fos = env->fos;
+#endif
 
-void set_fpu_twd(struct task_struct *tsk, unsigned short twd)
-{
-        if (cpu_has_fxsr) {
-                tsk->thread.i387.fxsave.twd = twd_i387_to_fxsr(twd);
-        } else {
-                tsk->thread.i387.fsave.twd = ((long)twd | 0xffff0000u);
-        }
+        for (i = 0; i < 8; ++i)
+                memcpy(&to[i], &from[i], sizeof(from[0]));
 }
 
-#endif  /*  0  */
-
-/*
- * FXSR floating point environment conversions.
- */
-
-static int convert_fxsr_to_user(struct _fpstate __user *buf,
-                                struct i387_fxsave_struct *fxsave)
+int fpregs_get(struct task_struct *target, const struct user_regset *regset,
+               unsigned int pos, unsigned int count,
+               void *kbuf, void __user *ubuf)
 {
-        unsigned long env[7];
-        struct _fpreg __user *to;
-        struct _fpxreg *from;
-        int i;
+        struct user_i387_ia32_struct env;
 
-        env[0] = (unsigned long)fxsave->cwd | 0xffff0000ul;
-        env[1] = (unsigned long)fxsave->swd | 0xffff0000ul;
-        env[2] = twd_fxsr_to_i387(fxsave);
-        env[3] = fxsave->fip;
-        env[4] = fxsave->fcs | ((unsigned long)fxsave->fop << 16);
-        env[5] = fxsave->foo;
-        env[6] = fxsave->fos;
+        if (!HAVE_HWFP)
+                return fpregs_soft_get(target, regset, pos, count, kbuf, ubuf);
 
-        if (__copy_to_user(buf, env, 7 * sizeof(unsigned long)))
-                return 1;
+        unlazy_fpu(target);
 
-        to = &buf->_st[0];
-        from = (struct _fpxreg *) &fxsave->st_space[0];
-        for (i = 0; i < 8; i++, to++, from++) {
-                unsigned long __user *t = (unsigned long __user *)to;
-                unsigned long *f = (unsigned long *)from;
+        if (!cpu_has_fxsr)
+                return user_regset_copyout(&pos, &count, &kbuf, &ubuf,
+                                           &target->thread.i387.fsave, 0, -1);
 
-                if (__put_user(*f, t) ||
-                    __put_user(*(f + 1), t + 1) ||
-                    __put_user(from->exponent, &to->exponent))
-                        return 1;
+        if (kbuf && pos == 0 && count == sizeof(env)) {
+                convert_from_fxsr(kbuf, target);
+                return 0;
         }
-        return 0;
+
+        convert_from_fxsr(&env, target);
+        return user_regset_copyout(&pos, &count, &kbuf, &ubuf, &env, 0, -1);
 }
 
-static int convert_fxsr_from_user(struct i387_fxsave_struct *fxsave,
-                                  struct _fpstate __user *buf)
+int fpregs_set(struct task_struct *target, const struct user_regset *regset,
+               unsigned int pos, unsigned int count,
+               const void *kbuf, const void __user *ubuf)
 {
-        unsigned long env[7];
-        struct _fpxreg *to;
-        struct _fpreg __user *from;
-        int i;
+        struct user_i387_ia32_struct env;
+        int ret;
 
-        if (__copy_from_user(env, buf, 7 * sizeof(long)))
-                return 1;
+        if (!HAVE_HWFP)
+                return fpregs_soft_set(target, regset, pos, count, kbuf, ubuf);
 
-        fxsave->cwd = (unsigned short)(env[0] & 0xffff);
-        fxsave->swd = (unsigned short)(env[1] & 0xffff);
-        fxsave->twd = twd_i387_to_fxsr((unsigned short)(env[2] & 0xffff));
-        fxsave->fip = env[3];
-        fxsave->fop = (unsigned short)((env[4] & 0xffff0000ul) >> 16);
-        fxsave->fcs = (env[4] & 0xffff);
-        fxsave->foo = env[5];
-        fxsave->fos = env[6];
-
-        to = (struct _fpxreg *) &fxsave->st_space[0];
-        from = &buf->_st[0];
-        for (i = 0; i < 8; i++, to++, from++) {
-                unsigned long *t = (unsigned long *)to;
-                unsigned long __user *f = (unsigned long __user *)from;
-
-                if (__get_user(*t, f) ||
-                    __get_user(*(t + 1), f + 1) ||
-                    __get_user(to->exponent, &from->exponent))
-                        return 1;
-        }
-        return 0;
+        unlazy_fpu(target);
+        set_stopped_child_used_math(target);
+
+        if (!cpu_has_fxsr)
+                return user_regset_copyin(&pos, &count, &kbuf, &ubuf,
+                                          &target->thread.i387.fsave, 0, -1);
+
+        if (pos > 0 || count < sizeof(env))
+                convert_from_fxsr(&env, target);
+
+        ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &env, 0, -1);
+        if (!ret)
+                convert_to_fxsr(target, &env);
+
+        return ret;
 }
 
 /*
  * Signal frame handlers.
  */
 
-static inline int save_i387_fsave(struct _fpstate __user *buf)
+static inline int save_i387_fsave(struct _fpstate_ia32 __user *buf)
 {
         struct task_struct *tsk = current;
 
@@ -309,14 +365,16 @@ static inline int save_i387_fsave(struct _fpstate __user *buf)
         return 1;
 }
 
-static int save_i387_fxsave(struct _fpstate __user *buf)
+static int save_i387_fxsave(struct _fpstate_ia32 __user *buf)
 {
         struct task_struct *tsk = current;
+        struct user_i387_ia32_struct env;
         int err = 0;
 
         unlazy_fpu(tsk);
 
-        if (convert_fxsr_to_user(buf, &tsk->thread.i387.fxsave))
+        convert_from_fxsr(&env, tsk);
+        if (__copy_to_user(buf, &env, sizeof(env)))
                 return -1;
 
         err |= __put_user(tsk->thread.i387.fxsave.swd, &buf->status);
@@ -330,7 +388,7 @@ static int save_i387_fxsave(struct _fpstate __user *buf)
         return 1;
 }
 
-int save_i387(struct _fpstate __user *buf)
+int save_i387_ia32(struct _fpstate_ia32 __user *buf)
 {
         if (!used_math())
                 return 0;
@@ -347,11 +405,13 @@ int save_i387(struct _fpstate __user *buf)
                         return save_i387_fsave(buf);
                 }
         } else {
-                return save_i387_soft(&current->thread.i387.soft, buf);
+                return fpregs_soft_get(current, NULL,
+                                       0, sizeof(struct user_i387_ia32_struct),
+                                       NULL, buf) ? -1 : 1;
         }
 }
 
-static inline int restore_i387_fsave(struct _fpstate __user *buf)
+static inline int restore_i387_fsave(struct _fpstate_ia32 __user *buf)
 {
         struct task_struct *tsk = current;
         clear_fpu(tsk);
@@ -359,19 +419,23 @@ static inline int restore_i387_fsave(struct _fpstate __user *buf)
                                 sizeof(struct i387_fsave_struct));
 }
 
-static int restore_i387_fxsave(struct _fpstate __user *buf)
+static int restore_i387_fxsave(struct _fpstate_ia32 __user *buf)
 {
         int err;
         struct task_struct *tsk = current;
+        struct user_i387_ia32_struct env;
         clear_fpu(tsk);
         err = __copy_from_user(&tsk->thread.i387.fxsave, &buf->_fxsr_env[0],
                                sizeof(struct i387_fxsave_struct));
         /* mxcsr reserved bits must be masked to zero for security reasons */
         tsk->thread.i387.fxsave.mxcsr &= mxcsr_feature_mask;
-        return err ? 1 : convert_fxsr_from_user(&tsk->thread.i387.fxsave, buf);
+        if (err || __copy_from_user(&env, buf, sizeof(env)))
+                return 1;
+        convert_to_fxsr(tsk, &env);
+        return 0;
 }
 
-int restore_i387(struct _fpstate __user *buf)
+int restore_i387_ia32(struct _fpstate_ia32 __user *buf)
 {
         int err;
 
@@ -382,101 +446,52 @@ int restore_i387(struct _fpstate __user *buf)
                         err = restore_i387_fsave(buf);
                 }
         } else {
-                err = restore_i387_soft(&current->thread.i387.soft, buf);
+                err = fpregs_soft_set(current, NULL,
+                                      0, sizeof(struct user_i387_ia32_struct),
+                                      NULL, buf) != 0;
         }
         set_used_math();
         return err;
 }
 
-/*
- * ptrace request handlers.
- */
+#endif  /* CONFIG_X86_32 || CONFIG_IA32_EMULATION */
 
-static inline int get_fpregs_fsave(struct user_i387_struct __user *buf,
-                                   struct task_struct *tsk)
-{
-        return __copy_to_user(buf, &tsk->thread.i387.fsave,
-                              sizeof(struct user_i387_struct));
-}
-
-static inline int get_fpregs_fxsave(struct user_i387_struct __user *buf,
-                                    struct task_struct *tsk)
-{
-        return convert_fxsr_to_user((struct _fpstate __user *)buf,
-                                    &tsk->thread.i387.fxsave);
-}
+#ifdef CONFIG_X86_64
 
 int get_fpregs(struct user_i387_struct __user *buf, struct task_struct *tsk)
 {
-        if (HAVE_HWFP) {
-                if (cpu_has_fxsr) {
-                        return get_fpregs_fxsave(buf, tsk);
-                } else {
-                        return get_fpregs_fsave(buf, tsk);
-                }
-        } else {
-                return save_i387_soft(&tsk->thread.i387.soft,
-                                      (struct _fpstate __user *)buf);
-        }
+        return xfpregs_get(tsk, NULL, 0, sizeof(*buf), NULL, buf);
 }
 
-static inline int set_fpregs_fsave(struct task_struct *tsk,
-                                   struct user_i387_struct __user *buf)
+int set_fpregs(struct task_struct *tsk, struct user_i387_struct __user *buf)
 {
-        return __copy_from_user(&tsk->thread.i387.fsave, buf,
-                                sizeof(struct user_i387_struct));
+        return xfpregs_set(tsk, NULL, 0, sizeof(*buf), NULL, buf);
 }
 
-static inline int set_fpregs_fxsave(struct task_struct *tsk,
-                                    struct user_i387_struct __user *buf)
+#else
+
+int get_fpregs(struct user_i387_struct __user *buf, struct task_struct *tsk)
 {
-        return convert_fxsr_from_user(&tsk->thread.i387.fxsave,
-                                      (struct _fpstate __user *)buf);
+        return fpregs_get(tsk, NULL, 0, sizeof(*buf), NULL, buf);
 }
 
 int set_fpregs(struct task_struct *tsk, struct user_i387_struct __user *buf)
 {
-        if (HAVE_HWFP) {
-                if (cpu_has_fxsr) {
-                        return set_fpregs_fxsave(tsk, buf);
-                } else {
-                        return set_fpregs_fsave(tsk, buf);
-                }
-        } else {
-                return restore_i387_soft(&tsk->thread.i387.soft,
-                                         (struct _fpstate __user *)buf);
-        }
+        return fpregs_set(tsk, NULL, 0, sizeof(*buf), NULL, buf);
 }
 
 int get_fpxregs(struct user_fxsr_struct __user *buf, struct task_struct *tsk)
 {
-        if (cpu_has_fxsr) {
-                if (__copy_to_user(buf, &tsk->thread.i387.fxsave,
-                                   sizeof(struct user_fxsr_struct)))
-                        return -EFAULT;
-                return 0;
-        } else {
-                return -EIO;
-        }
+        return xfpregs_get(tsk, NULL, 0, sizeof(*buf), NULL, buf);
 }
 
 int set_fpxregs(struct task_struct *tsk, struct user_fxsr_struct __user *buf)
 {
-        int ret = 0;
-
-        if (cpu_has_fxsr) {
-                if (__copy_from_user(&tsk->thread.i387.fxsave, buf,
-                                     sizeof(struct user_fxsr_struct)))
-                        ret = -EFAULT;
-                /* mxcsr reserved bits must be masked to zero
-                 * for security reasons */
-                tsk->thread.i387.fxsave.mxcsr &= mxcsr_feature_mask;
-        } else {
-                ret = -EIO;
-        }
-        return ret;
+        return xfpregs_get(tsk, NULL, 0, sizeof(*buf), NULL, buf);
 }
 
+#endif
+
 /*
  * FPU state for core dumps.
  */
@@ -538,7 +553,7 @@ int dump_task_fpu(struct task_struct *tsk, struct user_i387_struct *fpu)
 }
 
 int dump_task_extended_fpu(struct task_struct *tsk,
-                           struct user_fxsr_struct *fpu)
+                           struct user32_fxsr_struct *fpu)
 {
         int fpvalid = tsk_used_math(tsk) && cpu_has_fxsr;