i386: prepare shared kernel/i387.c

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 0 insertions, 546 deletions

diff --git a/arch/i386/kernel/i387.c b/arch/i386/kernel/i387.c
deleted file mode 100644
index 665847281ed..00000000000
--- a/arch/i386/kernel/i387.c
+++ /dev/null
@@ -1,546 +0,0 @@
-/*
- *  linux/arch/i386/kernel/i387.c
- *
- *  Copyright (C) 1994 Linus Torvalds
- *
- *  Pentium III FXSR, SSE support
- *  General FPU state handling cleanups
- *	Gareth Hughes <gareth@valinux.com>, May 2000
- */
-
-#include <linux/sched.h>
-#include <linux/module.h>
-#include <asm/processor.h>
-#include <asm/i387.h>
-#include <asm/math_emu.h>
-#include <asm/sigcontext.h>
-#include <asm/user.h>
-#include <asm/ptrace.h>
-#include <asm/uaccess.h>
-
-#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;
-
-void mxcsr_feature_mask_init(void)
-{
-	unsigned long mask = 0;
-	clts();
-	if (cpu_has_fxsr) {
-		memset(&current->thread.i387.fxsave, 0, sizeof(struct i387_fxsave_struct));
-		asm volatile("fxsave %0" : : "m" (current->thread.i387.fxsave)); 
-		mask = current->thread.i387.fxsave.mxcsr_mask;
-		if (mask == 0) mask = 0x0000ffbf;
-	} 
-	mxcsr_feature_mask &= mask;
-	stts();
-}
-
-/*
- * The _current_ task is using the FPU for the first time
- * so initialize it and set the mxcsr to its default
- * value at reset if we support XMM instructions and then
- * remeber the current task has used the FPU.
- */
-void init_fpu(struct task_struct *tsk)
-{
-	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;
-	} else {
-		memset(&tsk->thread.i387.fsave, 0, sizeof(struct i387_fsave_struct));
-		tsk->thread.i387.fsave.cwd = 0xffff037fu;
-		tsk->thread.i387.fsave.swd = 0xffff0000u;
-		tsk->thread.i387.fsave.twd = 0xffffffffu;
-		tsk->thread.i387.fsave.fos = 0xffff0000u;
-	}
-	/* only the device not available exception or ptrace can call init_fpu */
-	set_stopped_child_used_math(tsk);
-}
-
-/*
- * FPU lazy state save handling.
- */
-
-void kernel_fpu_begin(void)
-{
-	struct thread_info *thread = current_thread_info();
-
-	preempt_disable();
-	if (thread->status & TS_USEDFPU) {
-		__save_init_fpu(thread->task);
-		return;
-	}
-	clts();
-}
-EXPORT_SYMBOL_GPL(kernel_fpu_begin);
-
-/*
- * FPU tag word conversions.
- */
-
-static inline unsigned short twd_i387_to_fxsr( unsigned short twd )
-{
-	unsigned int tmp; /* to avoid 16 bit prefixes in the code */
- 
-	/* Transform each pair of bits into 01 (valid) or 00 (empty) */
-        tmp = ~twd;
-        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);
-
-	for ( i = 0 ; i < 8 ; i++ ) {
-		if ( twd & 0x1 ) {
-			st = FPREG_ADDR( fxsave, (i - tos) & 7 );
-
-			switch ( st->exponent & 0x7fff ) {
-			case 0x7fff:
-				tag = 2;		/* Special */
-				break;
-			case 0x0000:
-				if ( !st->significand[0] &&
-				     !st->significand[1] &&
-				     !st->significand[2] &&
-				     !st->significand[3] ) {
-					tag = 1;	/* Zero */
-				} else {
-					tag = 2;	/* Special */
-				}
-				break;
-			default:
-				if ( st->significand[3] & 0x8000 ) {
-					tag = 0;	/* Valid */
-				} else {
-					tag = 2;	/* Special */
-				}
-				break;
-			}
-		} else {
-			tag = 3;			/* Empty */
-		}
-		ret |= (tag << (2 * i));
-		twd = twd >> 1;
-	}
-	return ret;
-}
-
-/*
- * FPU state interaction.
- */
-
-unsigned short get_fpu_cwd( struct task_struct *tsk )
-{
-	if ( cpu_has_fxsr ) {
-		return tsk->thread.i387.fxsave.cwd;
-	} else {
-		return (unsigned short)tsk->thread.i387.fsave.cwd;
-	}
-}
-
-unsigned short get_fpu_swd( struct task_struct *tsk )
-{
-	if ( cpu_has_fxsr ) {
-		return tsk->thread.i387.fxsave.swd;
-	} else {
-		return (unsigned short)tsk->thread.i387.fsave.swd;
-	}
-}
-
-#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  */
-
-unsigned short get_fpu_mxcsr( struct task_struct *tsk )
-{
-	if ( cpu_has_xmm ) {
-		return tsk->thread.i387.fxsave.mxcsr;
-	} else {
-		return 0x1f80;
-	}
-}
-
-#if 0
-
-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);
-	}
-}
-
-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);
-	}
-}
-
-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);
-	}
-}
-
-#endif  /*  0  */
-
-/*
- * FXSR floating point environment conversions.
- */
-
-static int convert_fxsr_to_user( struct _fpstate __user *buf,
-					struct i387_fxsave_struct *fxsave )
-{
-	unsigned long env[7];
-	struct _fpreg __user *to;
-	struct _fpxreg *from;
-	int i;
-
-	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 ( __copy_to_user( buf, env, 7 * sizeof(unsigned long) ) )
-		return 1;
-
-	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 (__put_user(*f, t) ||
-				__put_user(*(f + 1), t + 1) ||
-				__put_user(from->exponent, &to->exponent))
-			return 1;
-	}
-	return 0;
-}
-
-static int convert_fxsr_from_user( struct i387_fxsave_struct *fxsave,
-					  struct _fpstate __user *buf )
-{
-	unsigned long env[7];
-	struct _fpxreg *to;
-	struct _fpreg __user *from;
-	int i;
-
-	if ( __copy_from_user( env, buf, 7 * sizeof(long) ) )
-		return 1;
-
-	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;
-}
-
-/*
- * Signal frame handlers.
- */
-
-static inline int save_i387_fsave( struct _fpstate __user *buf )
-{
-	struct task_struct *tsk = current;
-
-	unlazy_fpu( tsk );
-	tsk->thread.i387.fsave.status = tsk->thread.i387.fsave.swd;
-	if ( __copy_to_user( buf, &tsk->thread.i387.fsave,
-			     sizeof(struct i387_fsave_struct) ) )
-		return -1;
-	return 1;
-}
-
-static int save_i387_fxsave( struct _fpstate __user *buf )
-{
-	struct task_struct *tsk = current;
-	int err = 0;
-
-	unlazy_fpu( tsk );
-
-	if ( convert_fxsr_to_user( buf, &tsk->thread.i387.fxsave ) )
-		return -1;
-
-	err |= __put_user( tsk->thread.i387.fxsave.swd, &buf->status );
-	err |= __put_user( X86_FXSR_MAGIC, &buf->magic );
-	if ( err )
-		return -1;
-
-	if ( __copy_to_user( &buf->_fxsr_env[0], &tsk->thread.i387.fxsave,
-			     sizeof(struct i387_fxsave_struct) ) )
-		return -1;
-	return 1;
-}
-
-int save_i387( struct _fpstate __user *buf )
-{
-	if ( !used_math() )
-		return 0;
-
-	/* This will cause a "finit" to be triggered by the next
-	 * attempted FPU operation by the 'current' process.
-	 */
-	clear_used_math();
-
-	if ( HAVE_HWFP ) {
-		if ( cpu_has_fxsr ) {
-			return save_i387_fxsave( buf );
-		} else {
-			return save_i387_fsave( buf );
-		}
-	} else {
-		return save_i387_soft( &current->thread.i387.soft, buf );
-	}
-}
-
-static inline int restore_i387_fsave( struct _fpstate __user *buf )
-{
-	struct task_struct *tsk = current;
-	clear_fpu( tsk );
-	return __copy_from_user( &tsk->thread.i387.fsave, buf,
-				 sizeof(struct i387_fsave_struct) );
-}
-
-static int restore_i387_fxsave( struct _fpstate __user *buf )
-{
-	int err;
-	struct task_struct *tsk = current;
-	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 );
-}
-
-int restore_i387( struct _fpstate __user *buf )
-{
-	int err;
-
-	if ( HAVE_HWFP ) {
-		if ( cpu_has_fxsr ) {
-			err = restore_i387_fxsave( buf );
-		} else {
-			err = restore_i387_fsave( buf );
-		}
-	} else {
-		err = restore_i387_soft( &current->thread.i387.soft, buf );
-	}
-	set_used_math();
-	return err;
-}
-
-/*
- * ptrace request handlers.
- */
-
-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 );
-}
-
-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 );
-	}
-}
-
-static inline int set_fpregs_fsave( struct task_struct *tsk,
-				    struct user_i387_struct __user *buf )
-{
-	return __copy_from_user( &tsk->thread.i387.fsave, buf,
-				 sizeof(struct user_i387_struct) );
-}
-
-static inline int set_fpregs_fxsave( struct task_struct *tsk,
-				     struct user_i387_struct __user *buf )
-{
-	return convert_fxsr_from_user( &tsk->thread.i387.fxsave,
-				       (struct _fpstate __user *)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 );
-	}
-}
-
-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;
-	}
-}
-
-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;
-}
-
-/*
- * FPU state for core dumps.
- */
-
-static inline void copy_fpu_fsave( struct task_struct *tsk,
-				   struct user_i387_struct *fpu )
-{
-	memcpy( fpu, &tsk->thread.i387.fsave,
-		sizeof(struct user_i387_struct) );
-}
-
-static inline void copy_fpu_fxsave( struct task_struct *tsk,
-				   struct user_i387_struct *fpu )
-{
-	unsigned short *to;
-	unsigned short *from;
-	int i;
-
-	memcpy( fpu, &tsk->thread.i387.fxsave, 7 * sizeof(long) );
-
-	to = (unsigned short *)&fpu->st_space[0];
-	from = (unsigned short *)&tsk->thread.i387.fxsave.st_space[0];
-	for ( i = 0 ; i < 8 ; i++, to += 5, from += 8 ) {
-		memcpy( to, from, 5 * sizeof(unsigned short) );
-	}
-}
-
-int dump_fpu( struct pt_regs *regs, struct user_i387_struct *fpu )
-{
-	int fpvalid;
-	struct task_struct *tsk = current;
-
-	fpvalid = !!used_math();
-	if ( fpvalid ) {
-		unlazy_fpu( tsk );
-		if ( cpu_has_fxsr ) {
-			copy_fpu_fxsave( tsk, fpu );
-		} else {
-			copy_fpu_fsave( tsk, fpu );
-		}
-	}
-
-	return fpvalid;
-}
-EXPORT_SYMBOL(dump_fpu);
-
-int dump_task_fpu(struct task_struct *tsk, struct user_i387_struct *fpu)
-{
-	int fpvalid = !!tsk_used_math(tsk);
-
-	if (fpvalid) {
-		if (tsk == current)
-			unlazy_fpu(tsk);
-		if (cpu_has_fxsr)
-			copy_fpu_fxsave(tsk, fpu);
-		else
-			copy_fpu_fsave(tsk, fpu);
-	}
-	return fpvalid;
-}
-
-int dump_task_extended_fpu(struct task_struct *tsk, struct user_fxsr_struct *fpu)
-{
-	int fpvalid = tsk_used_math(tsk) && cpu_has_fxsr;
-
-	if (fpvalid) {
-		if (tsk == current)
-		       unlazy_fpu(tsk);
-		memcpy(fpu, &tsk->thread.i387.fxsave, sizeof(*fpu));
-	}
-	return fpvalid;
-}