[net-next-2.6.git] / arch / um / sys-i386 / ptrace.c

/* 
 * Copyright (C) 2000, 2001, 2002 Jeff Dike (jdike@karaya.com)
 * Licensed under the GPL
 */

#include <linux/config.h>
#include <linux/compiler.h>
#include "linux/sched.h"
#include "asm/elf.h"
#include "asm/ptrace.h"
#include "asm/uaccess.h"
#include "asm/unistd.h"
#include "sysdep/ptrace.h"
#include "sysdep/sigcontext.h"
#include "sysdep/sc.h"

void arch_switch(void)
{
	update_debugregs(current->thread.arch.debugregs_seq);
}

int is_syscall(unsigned long addr)
{
	unsigned short instr;
	int n;

	n = copy_from_user(&instr, (void __user *) addr, sizeof(instr));
	if(n){
		printk("is_syscall : failed to read instruction from 0x%lx\n",
		       addr);
		return(0);
	}
	/* int 0x80 or sysenter */
	return((instr == 0x80cd) || (instr == 0x340f));
}

/* determines which flags the user has access to. */
/* 1 = access 0 = no access */
#define FLAG_MASK 0x00044dd5

int putreg(struct task_struct *child, int regno, unsigned long value)
{
	regno >>= 2;
	switch (regno) {
	case FS:
		if (value && (value & 3) != 3)
			return -EIO;
		PT_REGS_FS(&child->thread.regs) = value;
		return 0;
	case GS:
		if (value && (value & 3) != 3)
			return -EIO;
		PT_REGS_GS(&child->thread.regs) = value;
		return 0;
	case DS:
	case ES:
		if (value && (value & 3) != 3)
			return -EIO;
		value &= 0xffff;
		break;
	case SS:
	case CS:
		if ((value & 3) != 3)
			return -EIO;
		value &= 0xffff;
		break;
	case EFL:
		value &= FLAG_MASK;
		value |= PT_REGS_EFLAGS(&child->thread.regs);
		break;
	}
	PT_REGS_SET(&child->thread.regs, regno, value);
	return 0;
}

int poke_user(struct task_struct *child, long addr, long data)
{
        if ((addr & 3) || addr < 0)
                return -EIO;

        if (addr < MAX_REG_OFFSET)
                return putreg(child, addr, data);

        else if((addr >= offsetof(struct user, u_debugreg[0])) &&
                (addr <= offsetof(struct user, u_debugreg[7]))){
                addr -= offsetof(struct user, u_debugreg[0]);
                addr = addr >> 2;
                if((addr == 4) || (addr == 5)) return -EIO;
                child->thread.arch.debugregs[addr] = data;
                return 0;
        }
        return -EIO;
}

unsigned long getreg(struct task_struct *child, int regno)
{
	unsigned long retval = ~0UL;

	regno >>= 2;
	switch (regno) {
	case FS:
	case GS:
	case DS:
	case ES:
	case SS:
	case CS:
		retval = 0xffff;
		/* fall through */
	default:
		retval &= PT_REG(&child->thread.regs, regno);
	}
	return retval;
}

int peek_user(struct task_struct *child, long addr, long data)
{
/* read the word at location addr in the USER area. */
        unsigned long tmp;

        if ((addr & 3) || addr < 0)
                return -EIO;

        tmp = 0;  /* Default return condition */
        if(addr < MAX_REG_OFFSET){
                tmp = getreg(child, addr);
        }
        else if((addr >= offsetof(struct user, u_debugreg[0])) &&
                (addr <= offsetof(struct user, u_debugreg[7]))){
                addr -= offsetof(struct user, u_debugreg[0]);
                addr = addr >> 2;
                tmp = child->thread.arch.debugregs[addr];
        }
        return put_user(tmp, (unsigned long *) data);
}

struct i387_fxsave_struct {
	unsigned short	cwd;
	unsigned short	swd;
	unsigned short	twd;
	unsigned short	fop;
	long	fip;
	long	fcs;
	long	foo;
	long	fos;
	long	mxcsr;
	long	reserved;
	long	st_space[32];	/* 8*16 bytes for each FP-reg = 128 bytes */
	long	xmm_space[32];	/* 8*16 bytes for each XMM-reg = 128 bytes */
	long	padding[56];
};

/*
 * 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 twd = (unsigned long) fxsave->twd;
	unsigned long tag;
	unsigned long ret = 0xffff0000;
	int i;

#define FPREG_ADDR(f, n)	((char *)&(f)->st_space + (n) * 16);

	for ( i = 0 ; i < 8 ; i++ ) {
		if ( twd & 0x1 ) {
			st = (struct _fpxreg *) FPREG_ADDR( fxsave, i );

			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;
}

/*
 * FXSR floating point environment conversions.
 */

#ifdef CONFIG_MODE_TT
static inline int convert_fxsr_to_user_tt(struct _fpstate __user *buf,
					  struct pt_regs *regs)
{
	struct i387_fxsave_struct *fxsave = SC_FXSR_ENV(PT_REGS_SC(regs));
	unsigned long env[7];
	struct _fpreg __user *to;
	struct _fpxreg *from;
	int i;

	env[0] = (unsigned long)fxsave->cwd | 0xffff0000;
	env[1] = (unsigned long)fxsave->swd | 0xffff0000;
	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++ ) {
		if ( __copy_to_user( to, from, sizeof(*to) ) )
			return 1;
	}
	return 0;
}
#endif

static inline int convert_fxsr_to_user(struct _fpstate __user *buf,
				       struct pt_regs *regs)
{
	return(CHOOSE_MODE(convert_fxsr_to_user_tt(buf, regs), 0));
}

#ifdef CONFIG_MODE_TT
static inline int convert_fxsr_from_user_tt(struct pt_regs *regs,
					    struct _fpstate __user *buf)
{
	struct i387_fxsave_struct *fxsave = SC_FXSR_ENV(PT_REGS_SC(regs));
	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] & 0xffff0000) >> 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++ ) {
		if ( __copy_from_user( to, from, sizeof(*from) ) )
			return 1;
	}
	return 0;
}
#endif

static inline int convert_fxsr_from_user(struct pt_regs *regs, 
					 struct _fpstate __user *buf)
{
	return(CHOOSE_MODE(convert_fxsr_from_user_tt(regs, buf), 0));
}

int get_fpregs(unsigned long buf, struct task_struct *child)
{
	int err;

	err = convert_fxsr_to_user((struct _fpstate __user *) buf,
				   &child->thread.regs);
	if(err) return(-EFAULT);
	else return(0);
}

int set_fpregs(unsigned long buf, struct task_struct *child)
{
	int err;

	err = convert_fxsr_from_user(&child->thread.regs, 
				     (struct _fpstate __user *) buf);
	if(err) return(-EFAULT);
	else return(0);
}

#ifdef CONFIG_MODE_TT
int get_fpxregs_tt(unsigned long buf, struct task_struct *tsk)
{
	struct pt_regs *regs = &tsk->thread.regs;
	struct i387_fxsave_struct *fxsave = SC_FXSR_ENV(PT_REGS_SC(regs));
	int err;

	err = __copy_to_user((void __user *) buf, fxsave,
			     sizeof(struct user_fxsr_struct));
	if(err) return -EFAULT;
	else return 0;
}
#endif

int get_fpxregs(unsigned long buf, struct task_struct *tsk)
{
	return(CHOOSE_MODE(get_fpxregs_tt(buf, tsk), 0));
}

#ifdef CONFIG_MODE_TT
int set_fpxregs_tt(unsigned long buf, struct task_struct *tsk)
{
	struct pt_regs *regs = &tsk->thread.regs;
	struct i387_fxsave_struct *fxsave = SC_FXSR_ENV(PT_REGS_SC(regs));
	int err;

	err = __copy_from_user(fxsave, (void __user *) buf,
			       sizeof(struct user_fxsr_struct) );
	if(err) return -EFAULT;
	else return 0;
}
#endif

int set_fpxregs(unsigned long buf, struct task_struct *tsk)
{
	return(CHOOSE_MODE(set_fpxregs_tt(buf, tsk), 0));
}

#ifdef notdef
int dump_fpu(struct pt_regs *regs, elf_fpregset_t *fpu)
{
	fpu->cwd = (((SC_FP_CW(PT_REGS_SC(regs)) & 0xffff) << 16) |
		    (SC_FP_SW(PT_REGS_SC(regs)) & 0xffff));
	fpu->swd = SC_FP_CSSEL(PT_REGS_SC(regs)) & 0xffff;
	fpu->twd = SC_FP_IPOFF(PT_REGS_SC(regs));
	fpu->fip = SC_FP_CSSEL(PT_REGS_SC(regs)) & 0xffff;
	fpu->fcs = SC_FP_DATAOFF(PT_REGS_SC(regs));
	fpu->foo = SC_FP_DATASEL(PT_REGS_SC(regs));
	fpu->fos = 0;
	memcpy(fpu->st_space, (void *) SC_FP_ST(PT_REGS_SC(regs)),
	       sizeof(fpu->st_space));
	return(1);
}
#endif

#ifdef CONFIG_MODE_TT
static inline void copy_fpu_fxsave_tt(struct pt_regs *regs,
				      struct user_i387_struct *buf)
{
	struct i387_fxsave_struct *fpu = SC_FXSR_ENV(PT_REGS_SC(regs));
	unsigned short *to;
	unsigned short *from;
	int i;

	memcpy( buf, fpu, 7 * sizeof(long) );

	to = (unsigned short *) &buf->st_space[0];
	from = (unsigned short *) &fpu->st_space[0];
	for ( i = 0 ; i < 8 ; i++, to += 5, from += 8 ) {
		memcpy( to, from, 5 * sizeof(unsigned short) );
	}
}
#endif

static inline void copy_fpu_fxsave(struct pt_regs *regs,
				   struct user_i387_struct *buf)
{
	(void) CHOOSE_MODE(copy_fpu_fxsave_tt(regs, buf), 0);
}

int dump_fpu(struct pt_regs *regs, elf_fpregset_t *fpu )
{
	copy_fpu_fxsave(regs, (struct user_i387_struct *) fpu);
	return(1);
}

/*
 * Overrides for Emacs so that we follow Linus's tabbing style.
 * Emacs will notice this stuff at the end of the file and automatically
 * adjust the settings for this buffer only.  This must remain at the end
 * of the file.
 * ---------------------------------------------------------------------------
 * Local variables:
 * c-file-style: "linux"
 * End:
 */
Commit	Line	Data
1da177e4 LT	1	/*
	2	* Copyright (C) 2000, 2001, 2002 Jeff Dike (jdike@karaya.com)
	3	* Licensed under the GPL
	4	*/
	5
	6	#include <linux/config.h>
	7	#include <linux/compiler.h>
	8	#include "linux/sched.h"
	9	#include "asm/elf.h"
	10	#include "asm/ptrace.h"
	11	#include "asm/uaccess.h"
	12	#include "asm/unistd.h"
	13	#include "sysdep/ptrace.h"
	14	#include "sysdep/sigcontext.h"
	15	#include "sysdep/sc.h"
	16
	17	void arch_switch(void)
	18	{
	19	update_debugregs(current->thread.arch.debugregs_seq);
	20	}
	21
	22	int is_syscall(unsigned long addr)
	23	{
	24	unsigned short instr;
	25	int n;
	26
	27	n = copy_from_user(&instr, (void __user *) addr, sizeof(instr));
	28	if(n){
	29	printk("is_syscall : failed to read instruction from 0x%lx\n",
	30	addr);
	31	return(0);
	32	}
	33	/* int 0x80 or sysenter */
	34	return((instr == 0x80cd) \|\| (instr == 0x340f));
	35	}
	36
	37	/* determines which flags the user has access to. */
	38	/* 1 = access 0 = no access */
	39	#define FLAG_MASK 0x00044dd5
	40
	41	int putreg(struct task_struct *child, int regno, unsigned long value)
	42	{
	43	regno >>= 2;
	44	switch (regno) {
	45	case FS:
	46	if (value && (value & 3) != 3)
	47	return -EIO;
	48	PT_REGS_FS(&child->thread.regs) = value;
	49	return 0;
	50	case GS:
	51	if (value && (value & 3) != 3)
	52	return -EIO;
	53	PT_REGS_GS(&child->thread.regs) = value;
	54	return 0;
	55	case DS:
	56	case ES:
	57	if (value && (value & 3) != 3)
	58	return -EIO;
	59	value &= 0xffff;
	60	break;
	61	case SS:
	62	case CS:
	63	if ((value & 3) != 3)
	64	return -EIO;
65	value &= 0xffff;
66	break;
67	case EFL:
68	value &= FLAG_MASK;
69	value \|= PT_REGS_EFLAGS(&child->thread.regs);
70	break;
71	}
72	PT_REGS_SET(&child->thread.regs, regno, value);
73	return 0;
74	}
75
82c1c11b BS	76	int poke_user(struct task_struct *child, long addr, long data)
	77	{
	78	if ((addr & 3) \|\| addr < 0)
	79	return -EIO;
	80
	81	if (addr < MAX_REG_OFFSET)
	82	return putreg(child, addr, data);
	83
	84	else if((addr >= offsetof(struct user, u_debugreg[0])) &&
	85	(addr <= offsetof(struct user, u_debugreg[7]))){
	86	addr -= offsetof(struct user, u_debugreg[0]);
	87	addr = addr >> 2;
	88	if((addr == 4) \|\| (addr == 5)) return -EIO;
	89	child->thread.arch.debugregs[addr] = data;
	90	return 0;
	91	}
	92	return -EIO;
	93	}
	94
1da177e4 LT	95	unsigned long getreg(struct task_struct *child, int regno)
	96	{
	97	unsigned long retval = ~0UL;
	98
	99	regno >>= 2;
	100	switch (regno) {
	101	case FS:
	102	case GS:
	103	case DS:
	104	case ES:
	105	case SS:
	106	case CS:
	107	retval = 0xffff;
	108	/* fall through */
	109	default:
	110	retval &= PT_REG(&child->thread.regs, regno);
	111	}
	112	return retval;
	113	}
	114
82c1c11b BS	115	int peek_user(struct task_struct *child, long addr, long data)
	116	{
	117	/* read the word at location addr in the USER area. */
	118	unsigned long tmp;
	119
	120	if ((addr & 3) \|\| addr < 0)
	121	return -EIO;
	122
	123	tmp = 0; /* Default return condition */
	124	if(addr < MAX_REG_OFFSET){
	125	tmp = getreg(child, addr);
	126	}
	127	else if((addr >= offsetof(struct user, u_debugreg[0])) &&
	128	(addr <= offsetof(struct user, u_debugreg[7]))){
	129	addr -= offsetof(struct user, u_debugreg[0]);
	130	addr = addr >> 2;
	131	tmp = child->thread.arch.debugregs[addr];
	132	}
	133	return put_user(tmp, (unsigned long *) data);
	134	}
	135
1da177e4 LT	136	struct i387_fxsave_struct {
	137	unsigned short cwd;
	138	unsigned short swd;
	139	unsigned short twd;
	140	unsigned short fop;
	141	long fip;
	142	long fcs;
	143	long foo;
	144	long fos;
	145	long mxcsr;
	146	long reserved;
	147	long st_space[32]; /* 816 bytes for each FP-reg = 128 bytes /
	148	long xmm_space[32]; /* 816 bytes for each XMM-reg = 128 bytes /
	149	long padding[56];
	150	};
	151
	152	/*
	153	* FPU tag word conversions.
	154	*/
	155
	156	static inline unsigned short twd_i387_to_fxsr( unsigned short twd )
	157	{
	158	unsigned int tmp; /* to avoid 16 bit prefixes in the code */
	159
	160	/* Transform each pair of bits into 01 (valid) or 00 (empty) */
	161	tmp = ~twd;
	162	tmp = (tmp \| (tmp>>1)) & 0x5555; /* 0V0V0V0V0V0V0V0V */
	163	/* and move the valid bits to the lower byte. */
	164	tmp = (tmp \| (tmp >> 1)) & 0x3333; /* 00VV00VV00VV00VV */
	165	tmp = (tmp \| (tmp >> 2)) & 0x0f0f; /* 0000VVVV0000VVVV */
	166	tmp = (tmp \| (tmp >> 4)) & 0x00ff; /* 00000000VVVVVVVV */
	167	return tmp;
	168	}
	169
	170	static inline unsigned long twd_fxsr_to_i387( struct i387_fxsave_struct *fxsave )
	171	{
	172	struct _fpxreg *st = NULL;
	173	unsigned long twd = (unsigned long) fxsave->twd;
	174	unsigned long tag;
	175	unsigned long ret = 0xffff0000;
	176	int i;
	177
	178	#define FPREG_ADDR(f, n) ((char )&(f)->st_space + (n) 16);
	179
	180	for ( i = 0 ; i < 8 ; i++ ) {
	181	if ( twd & 0x1 ) {
	182	st = (struct _fpxreg *) FPREG_ADDR( fxsave, i );
	183
	184	switch ( st->exponent & 0x7fff ) {
	185	case 0x7fff:
	186	tag = 2; /* Special */
	187	break;
	188	case 0x0000:
	189	if ( !st->significand[0] &&
	190	!st->significand[1] &&
	191	!st->significand[2] &&
	192	!st->significand[3] ) {
	193	tag = 1; /* Zero */
	194	} else {
	195	tag = 2; /* Special */
	196	}
	197	break;
	198	default:
	199	if ( st->significand[3] & 0x8000 ) {
200	tag = 0; /* Valid */
201	} else {
202	tag = 2; /* Special */
203	}
204	break;
205	}
206	} else {
207	tag = 3; /* Empty */
208	}
209	ret \|= (tag << (2 * i));
210	twd = twd >> 1;
211	}
212	return ret;
213	}
214
215	/*
216	* FXSR floating point environment conversions.
217	*/
218
219	#ifdef CONFIG_MODE_TT
220	static inline int convert_fxsr_to_user_tt(struct _fpstate __user *buf,
221	struct pt_regs *regs)
222	{
223	struct i387_fxsave_struct *fxsave = SC_FXSR_ENV(PT_REGS_SC(regs));
224	unsigned long env[7];
225	struct _fpreg __user *to;
226	struct _fpxreg *from;
227	int i;
228
229	env[0] = (unsigned long)fxsave->cwd \| 0xffff0000;
230	env[1] = (unsigned long)fxsave->swd \| 0xffff0000;
231	env[2] = twd_fxsr_to_i387(fxsave);
232	env[3] = fxsave->fip;
233	env[4] = fxsave->fcs \| ((unsigned long)fxsave->fop << 16);
234	env[5] = fxsave->foo;
235	env[6] = fxsave->fos;
236
237	if ( __copy_to_user( buf, env, 7 * sizeof(unsigned long) ) )
238	return 1;
239
240	to = &buf->_st[0];
241	from = (struct _fpxreg *) &fxsave->st_space[0];
242	for ( i = 0 ; i < 8 ; i++, to++, from++ ) {
243	if ( __copy_to_user( to, from, sizeof(*to) ) )
244	return 1;
245	}
246	return 0;
247	}
248	#endif
249
250	static inline int convert_fxsr_to_user(struct _fpstate __user *buf,
251	struct pt_regs *regs)
252	{
253	return(CHOOSE_MODE(convert_fxsr_to_user_tt(buf, regs), 0));
254	}
255
256	#ifdef CONFIG_MODE_TT
257	static inline int convert_fxsr_from_user_tt(struct pt_regs *regs,
258	struct _fpstate __user *buf)
259	{
260	struct i387_fxsave_struct *fxsave = SC_FXSR_ENV(PT_REGS_SC(regs));
261	unsigned long env[7];
262	struct _fpxreg *to;
263	struct _fpreg __user *from;
264	int i;
265
266	if ( __copy_from_user( env, buf, 7 * sizeof(long) ) )
267	return 1;
268
269	fxsave->cwd = (unsigned short)(env[0] & 0xffff);
270	fxsave->swd = (unsigned short)(env[1] & 0xffff);
271	fxsave->twd = twd_i387_to_fxsr((unsigned short)(env[2] & 0xffff));
272	fxsave->fip = env[3];
273	fxsave->fop = (unsigned short)((env[4] & 0xffff0000) >> 16);
274	fxsave->fcs = (env[4] & 0xffff);
275	fxsave->foo = env[5];
276	fxsave->fos = env[6];
277
278	to = (struct _fpxreg *) &fxsave->st_space[0];
279	from = &buf->_st[0];
280	for ( i = 0 ; i < 8 ; i++, to++, from++ ) {
281	if ( __copy_from_user( to, from, sizeof(*from) ) )
282	return 1;
283	}
284	return 0;
285	}
286	#endif
287
288	static inline int convert_fxsr_from_user(struct pt_regs *regs,
289	struct _fpstate __user *buf)
290	{
291	return(CHOOSE_MODE(convert_fxsr_from_user_tt(regs, buf), 0));
292	}
293
294	int get_fpregs(unsigned long buf, struct task_struct *child)
295	{
296	int err;
297
298	err = convert_fxsr_to_user((struct _fpstate __user *) buf,
299	&child->thread.regs);
300	if(err) return(-EFAULT);
301	else return(0);
302	}
303
304	int set_fpregs(unsigned long buf, struct task_struct *child)
305	{
306	int err;
307
308	err = convert_fxsr_from_user(&child->thread.regs,
309	(struct _fpstate __user *) buf);
310	if(err) return(-EFAULT);
311	else return(0);
312	}
313
314	#ifdef CONFIG_MODE_TT
315	int get_fpxregs_tt(unsigned long buf, struct task_struct *tsk)
316	{
317	struct pt_regs *regs = &tsk->thread.regs;
318	struct i387_fxsave_struct *fxsave = SC_FXSR_ENV(PT_REGS_SC(regs));
319	int err;
320
321	err = __copy_to_user((void __user *) buf, fxsave,
322	sizeof(struct user_fxsr_struct));
323	if(err) return -EFAULT;
324	else return 0;
325	}
326	#endif
327
328	int get_fpxregs(unsigned long buf, struct task_struct *tsk)
329	{
330	return(CHOOSE_MODE(get_fpxregs_tt(buf, tsk), 0));
331	}
332
333	#ifdef CONFIG_MODE_TT
334	int set_fpxregs_tt(unsigned long buf, struct task_struct *tsk)
335	{
336	struct pt_regs *regs = &tsk->thread.regs;
337	struct i387_fxsave_struct *fxsave = SC_FXSR_ENV(PT_REGS_SC(regs));
338	int err;
339
340	err = __copy_from_user(fxsave, (void __user *) buf,
341	sizeof(struct user_fxsr_struct) );
342	if(err) return -EFAULT;
343	else return 0;
344	}
345	#endif
346
347	int set_fpxregs(unsigned long buf, struct task_struct *tsk)
348	{
349	return(CHOOSE_MODE(set_fpxregs_tt(buf, tsk), 0));
350	}
351
352	#ifdef notdef
353	int dump_fpu(struct pt_regs regs, elf_fpregset_t fpu)
354	{
355	fpu->cwd = (((SC_FP_CW(PT_REGS_SC(regs)) & 0xffff) << 16) \|
356	(SC_FP_SW(PT_REGS_SC(regs)) & 0xffff));
357	fpu->swd = SC_FP_CSSEL(PT_REGS_SC(regs)) & 0xffff;
358	fpu->twd = SC_FP_IPOFF(PT_REGS_SC(regs));
359	fpu->fip = SC_FP_CSSEL(PT_REGS_SC(regs)) & 0xffff;
360	fpu->fcs = SC_FP_DATAOFF(PT_REGS_SC(regs));
361	fpu->foo = SC_FP_DATASEL(PT_REGS_SC(regs));
362	fpu->fos = 0;
363	memcpy(fpu->st_space, (void *) SC_FP_ST(PT_REGS_SC(regs)),
364	sizeof(fpu->st_space));
365	return(1);
366	}
367	#endif
368
369	#ifdef CONFIG_MODE_TT
370	static inline void copy_fpu_fxsave_tt(struct pt_regs *regs,
371	struct user_i387_struct *buf)
372	{
373	struct i387_fxsave_struct *fpu = SC_FXSR_ENV(PT_REGS_SC(regs));
374	unsigned short *to;
375	unsigned short *from;
376	int i;
377
378	memcpy( buf, fpu, 7 * sizeof(long) );
379
380	to = (unsigned short *) &buf->st_space[0];
381	from = (unsigned short *) &fpu->st_space[0];
382	for ( i = 0 ; i < 8 ; i++, to += 5, from += 8 ) {
383	memcpy( to, from, 5 * sizeof(unsigned short) );
384	}
385	}
386	#endif
387
388	static inline void copy_fpu_fxsave(struct pt_regs *regs,
389	struct user_i387_struct *buf)
390	{
391	(void) CHOOSE_MODE(copy_fpu_fxsave_tt(regs, buf), 0);
392	}
393
394	int dump_fpu(struct pt_regs regs, elf_fpregset_t fpu )
395	{
396	copy_fpu_fxsave(regs, (struct user_i387_struct *) fpu);
397	return(1);
398	}
399
400	/*
401	* Overrides for Emacs so that we follow Linus's tabbing style.
402	* Emacs will notice this stuff at the end of the file and automatically
403	* adjust the settings for this buffer only. This must remain at the end
404	* of the file.
405	* ---------------------------------------------------------------------------
406	* Local variables:
407	* c-file-style: "linux"
408	* End:
409	*/