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-rw-r--r--arch/x86/kernel/i387_32.c544
1 files changed, 0 insertions, 544 deletions
diff --git a/arch/x86/kernel/i387_32.c b/arch/x86/kernel/i387_32.c
deleted file mode 100644
index 7d2e12f6c78b..000000000000
--- a/arch/x86/kernel/i387_32.c
+++ /dev/null
@@ -1,544 +0,0 @@
1/*
2 * Copyright (C) 1994 Linus Torvalds
3 *
4 * Pentium III FXSR, SSE support
5 * General FPU state handling cleanups
6 * Gareth Hughes <gareth@valinux.com>, May 2000
7 */
8
9#include <linux/sched.h>
10#include <linux/module.h>
11#include <asm/processor.h>
12#include <asm/i387.h>
13#include <asm/math_emu.h>
14#include <asm/sigcontext.h>
15#include <asm/user.h>
16#include <asm/ptrace.h>
17#include <asm/uaccess.h>
18
19#ifdef CONFIG_MATH_EMULATION
20#define HAVE_HWFP (boot_cpu_data.hard_math)
21#else
22#define HAVE_HWFP 1
23#endif
24
25static unsigned long mxcsr_feature_mask __read_mostly = 0xffffffff;
26
27void mxcsr_feature_mask_init(void)
28{
29 unsigned long mask = 0;
30 clts();
31 if (cpu_has_fxsr) {
32 memset(&current->thread.i387.fxsave, 0, sizeof(struct i387_fxsave_struct));
33 asm volatile("fxsave %0" : : "m" (current->thread.i387.fxsave));
34 mask = current->thread.i387.fxsave.mxcsr_mask;
35 if (mask == 0) mask = 0x0000ffbf;
36 }
37 mxcsr_feature_mask &= mask;
38 stts();
39}
40
41/*
42 * The _current_ task is using the FPU for the first time
43 * so initialize it and set the mxcsr to its default
44 * value at reset if we support XMM instructions and then
45 * remeber the current task has used the FPU.
46 */
47void init_fpu(struct task_struct *tsk)
48{
49 if (cpu_has_fxsr) {
50 memset(&tsk->thread.i387.fxsave, 0, sizeof(struct i387_fxsave_struct));
51 tsk->thread.i387.fxsave.cwd = 0x37f;
52 if (cpu_has_xmm)
53 tsk->thread.i387.fxsave.mxcsr = 0x1f80;
54 } else {
55 memset(&tsk->thread.i387.fsave, 0, sizeof(struct i387_fsave_struct));
56 tsk->thread.i387.fsave.cwd = 0xffff037fu;
57 tsk->thread.i387.fsave.swd = 0xffff0000u;
58 tsk->thread.i387.fsave.twd = 0xffffffffu;
59 tsk->thread.i387.fsave.fos = 0xffff0000u;
60 }
61 /* only the device not available exception or ptrace can call init_fpu */
62 set_stopped_child_used_math(tsk);
63}
64
65/*
66 * FPU lazy state save handling.
67 */
68
69void kernel_fpu_begin(void)
70{
71 struct thread_info *thread = current_thread_info();
72
73 preempt_disable();
74 if (thread->status & TS_USEDFPU) {
75 __save_init_fpu(thread->task);
76 return;
77 }
78 clts();
79}
80EXPORT_SYMBOL_GPL(kernel_fpu_begin);
81
82/*
83 * FPU tag word conversions.
84 */
85
86static inline unsigned short twd_i387_to_fxsr( unsigned short twd )
87{
88 unsigned int tmp; /* to avoid 16 bit prefixes in the code */
89
90 /* Transform each pair of bits into 01 (valid) or 00 (empty) */
91 tmp = ~twd;
92 tmp = (tmp | (tmp>>1)) & 0x5555; /* 0V0V0V0V0V0V0V0V */
93 /* and move the valid bits to the lower byte. */
94 tmp = (tmp | (tmp >> 1)) & 0x3333; /* 00VV00VV00VV00VV */
95 tmp = (tmp | (tmp >> 2)) & 0x0f0f; /* 0000VVVV0000VVVV */
96 tmp = (tmp | (tmp >> 4)) & 0x00ff; /* 00000000VVVVVVVV */
97 return tmp;
98}
99
100static inline unsigned long twd_fxsr_to_i387( struct i387_fxsave_struct *fxsave )
101{
102 struct _fpxreg *st = NULL;
103 unsigned long tos = (fxsave->swd >> 11) & 7;
104 unsigned long twd = (unsigned long) fxsave->twd;
105 unsigned long tag;
106 unsigned long ret = 0xffff0000u;
107 int i;
108
109#define FPREG_ADDR(f, n) ((void *)&(f)->st_space + (n) * 16);
110
111 for ( i = 0 ; i < 8 ; i++ ) {
112 if ( twd & 0x1 ) {
113 st = FPREG_ADDR( fxsave, (i - tos) & 7 );
114
115 switch ( st->exponent & 0x7fff ) {
116 case 0x7fff:
117 tag = 2; /* Special */
118 break;
119 case 0x0000:
120 if ( !st->significand[0] &&
121 !st->significand[1] &&
122 !st->significand[2] &&
123 !st->significand[3] ) {
124 tag = 1; /* Zero */
125 } else {
126 tag = 2; /* Special */
127 }
128 break;
129 default:
130 if ( st->significand[3] & 0x8000 ) {
131 tag = 0; /* Valid */
132 } else {
133 tag = 2; /* Special */
134 }
135 break;
136 }
137 } else {
138 tag = 3; /* Empty */
139 }
140 ret |= (tag << (2 * i));
141 twd = twd >> 1;
142 }
143 return ret;
144}
145
146/*
147 * FPU state interaction.
148 */
149
150unsigned short get_fpu_cwd( struct task_struct *tsk )
151{
152 if ( cpu_has_fxsr ) {
153 return tsk->thread.i387.fxsave.cwd;
154 } else {
155 return (unsigned short)tsk->thread.i387.fsave.cwd;
156 }
157}
158
159unsigned short get_fpu_swd( struct task_struct *tsk )
160{
161 if ( cpu_has_fxsr ) {
162 return tsk->thread.i387.fxsave.swd;
163 } else {
164 return (unsigned short)tsk->thread.i387.fsave.swd;
165 }
166}
167
168#if 0
169unsigned short get_fpu_twd( struct task_struct *tsk )
170{
171 if ( cpu_has_fxsr ) {
172 return tsk->thread.i387.fxsave.twd;
173 } else {
174 return (unsigned short)tsk->thread.i387.fsave.twd;
175 }
176}
177#endif /* 0 */
178
179unsigned short get_fpu_mxcsr( struct task_struct *tsk )
180{
181 if ( cpu_has_xmm ) {
182 return tsk->thread.i387.fxsave.mxcsr;
183 } else {
184 return 0x1f80;
185 }
186}
187
188#if 0
189
190void set_fpu_cwd( struct task_struct *tsk, unsigned short cwd )
191{
192 if ( cpu_has_fxsr ) {
193 tsk->thread.i387.fxsave.cwd = cwd;
194 } else {
195 tsk->thread.i387.fsave.cwd = ((long)cwd | 0xffff0000u);
196 }
197}
198
199void set_fpu_swd( struct task_struct *tsk, unsigned short swd )
200{
201 if ( cpu_has_fxsr ) {
202 tsk->thread.i387.fxsave.swd = swd;
203 } else {
204 tsk->thread.i387.fsave.swd = ((long)swd | 0xffff0000u);
205 }
206}
207
208void set_fpu_twd( struct task_struct *tsk, unsigned short twd )
209{
210 if ( cpu_has_fxsr ) {
211 tsk->thread.i387.fxsave.twd = twd_i387_to_fxsr(twd);
212 } else {
213 tsk->thread.i387.fsave.twd = ((long)twd | 0xffff0000u);
214 }
215}
216
217#endif /* 0 */
218
219/*
220 * FXSR floating point environment conversions.
221 */
222
223static int convert_fxsr_to_user( struct _fpstate __user *buf,
224 struct i387_fxsave_struct *fxsave )
225{
226 unsigned long env[7];
227 struct _fpreg __user *to;
228 struct _fpxreg *from;
229 int i;
230
231 env[0] = (unsigned long)fxsave->cwd | 0xffff0000ul;
232 env[1] = (unsigned long)fxsave->swd | 0xffff0000ul;
233 env[2] = twd_fxsr_to_i387(fxsave);
234 env[3] = fxsave->fip;
235 env[4] = fxsave->fcs | ((unsigned long)fxsave->fop << 16);
236 env[5] = fxsave->foo;
237 env[6] = fxsave->fos;
238
239 if ( __copy_to_user( buf, env, 7 * sizeof(unsigned long) ) )
240 return 1;
241
242 to = &buf->_st[0];
243 from = (struct _fpxreg *) &fxsave->st_space[0];
244 for ( i = 0 ; i < 8 ; i++, to++, from++ ) {
245 unsigned long __user *t = (unsigned long __user *)to;
246 unsigned long *f = (unsigned long *)from;
247
248 if (__put_user(*f, t) ||
249 __put_user(*(f + 1), t + 1) ||
250 __put_user(from->exponent, &to->exponent))
251 return 1;
252 }
253 return 0;
254}
255
256static int convert_fxsr_from_user( struct i387_fxsave_struct *fxsave,
257 struct _fpstate __user *buf )
258{
259 unsigned long env[7];
260 struct _fpxreg *to;
261 struct _fpreg __user *from;
262 int i;
263
264 if ( __copy_from_user( env, buf, 7 * sizeof(long) ) )
265 return 1;
266
267 fxsave->cwd = (unsigned short)(env[0] & 0xffff);
268 fxsave->swd = (unsigned short)(env[1] & 0xffff);
269 fxsave->twd = twd_i387_to_fxsr((unsigned short)(env[2] & 0xffff));
270 fxsave->fip = env[3];
271 fxsave->fop = (unsigned short)((env[4] & 0xffff0000ul) >> 16);
272 fxsave->fcs = (env[4] & 0xffff);
273 fxsave->foo = env[5];
274 fxsave->fos = env[6];
275
276 to = (struct _fpxreg *) &fxsave->st_space[0];
277 from = &buf->_st[0];
278 for ( i = 0 ; i < 8 ; i++, to++, from++ ) {
279 unsigned long *t = (unsigned long *)to;
280 unsigned long __user *f = (unsigned long __user *)from;
281
282 if (__get_user(*t, f) ||
283 __get_user(*(t + 1), f + 1) ||
284 __get_user(to->exponent, &from->exponent))
285 return 1;
286 }
287 return 0;
288}
289
290/*
291 * Signal frame handlers.
292 */
293
294static inline int save_i387_fsave( struct _fpstate __user *buf )
295{
296 struct task_struct *tsk = current;
297
298 unlazy_fpu( tsk );
299 tsk->thread.i387.fsave.status = tsk->thread.i387.fsave.swd;
300 if ( __copy_to_user( buf, &tsk->thread.i387.fsave,
301 sizeof(struct i387_fsave_struct) ) )
302 return -1;
303 return 1;
304}
305
306static int save_i387_fxsave( struct _fpstate __user *buf )
307{
308 struct task_struct *tsk = current;
309 int err = 0;
310
311 unlazy_fpu( tsk );
312
313 if ( convert_fxsr_to_user( buf, &tsk->thread.i387.fxsave ) )
314 return -1;
315
316 err |= __put_user( tsk->thread.i387.fxsave.swd, &buf->status );
317 err |= __put_user( X86_FXSR_MAGIC, &buf->magic );
318 if ( err )
319 return -1;
320
321 if ( __copy_to_user( &buf->_fxsr_env[0], &tsk->thread.i387.fxsave,
322 sizeof(struct i387_fxsave_struct) ) )
323 return -1;
324 return 1;
325}
326
327int save_i387( struct _fpstate __user *buf )
328{
329 if ( !used_math() )
330 return 0;
331
332 /* This will cause a "finit" to be triggered by the next
333 * attempted FPU operation by the 'current' process.
334 */
335 clear_used_math();
336
337 if ( HAVE_HWFP ) {
338 if ( cpu_has_fxsr ) {
339 return save_i387_fxsave( buf );
340 } else {
341 return save_i387_fsave( buf );
342 }
343 } else {
344 return save_i387_soft( &current->thread.i387.soft, buf );
345 }
346}
347
348static inline int restore_i387_fsave( struct _fpstate __user *buf )
349{
350 struct task_struct *tsk = current;
351 clear_fpu( tsk );
352 return __copy_from_user( &tsk->thread.i387.fsave, buf,
353 sizeof(struct i387_fsave_struct) );
354}
355
356static int restore_i387_fxsave( struct _fpstate __user *buf )
357{
358 int err;
359 struct task_struct *tsk = current;
360 clear_fpu( tsk );
361 err = __copy_from_user( &tsk->thread.i387.fxsave, &buf->_fxsr_env[0],
362 sizeof(struct i387_fxsave_struct) );
363 /* mxcsr reserved bits must be masked to zero for security reasons */
364 tsk->thread.i387.fxsave.mxcsr &= mxcsr_feature_mask;
365 return err ? 1 : convert_fxsr_from_user( &tsk->thread.i387.fxsave, buf );
366}
367
368int restore_i387( struct _fpstate __user *buf )
369{
370 int err;
371
372 if ( HAVE_HWFP ) {
373 if ( cpu_has_fxsr ) {
374 err = restore_i387_fxsave( buf );
375 } else {
376 err = restore_i387_fsave( buf );
377 }
378 } else {
379 err = restore_i387_soft( &current->thread.i387.soft, buf );
380 }
381 set_used_math();
382 return err;
383}
384
385/*
386 * ptrace request handlers.
387 */
388
389static inline int get_fpregs_fsave( struct user_i387_struct __user *buf,
390 struct task_struct *tsk )
391{
392 return __copy_to_user( buf, &tsk->thread.i387.fsave,
393 sizeof(struct user_i387_struct) );
394}
395
396static inline int get_fpregs_fxsave( struct user_i387_struct __user *buf,
397 struct task_struct *tsk )
398{
399 return convert_fxsr_to_user( (struct _fpstate __user *)buf,
400 &tsk->thread.i387.fxsave );
401}
402
403int get_fpregs( struct user_i387_struct __user *buf, struct task_struct *tsk )
404{
405 if ( HAVE_HWFP ) {
406 if ( cpu_has_fxsr ) {
407 return get_fpregs_fxsave( buf, tsk );
408 } else {
409 return get_fpregs_fsave( buf, tsk );
410 }
411 } else {
412 return save_i387_soft( &tsk->thread.i387.soft,
413 (struct _fpstate __user *)buf );
414 }
415}
416
417static inline int set_fpregs_fsave( struct task_struct *tsk,
418 struct user_i387_struct __user *buf )
419{
420 return __copy_from_user( &tsk->thread.i387.fsave, buf,
421 sizeof(struct user_i387_struct) );
422}
423
424static inline int set_fpregs_fxsave( struct task_struct *tsk,
425 struct user_i387_struct __user *buf )
426{
427 return convert_fxsr_from_user( &tsk->thread.i387.fxsave,
428 (struct _fpstate __user *)buf );
429}
430
431int set_fpregs( struct task_struct *tsk, struct user_i387_struct __user *buf )
432{
433 if ( HAVE_HWFP ) {
434 if ( cpu_has_fxsr ) {
435 return set_fpregs_fxsave( tsk, buf );
436 } else {
437 return set_fpregs_fsave( tsk, buf );
438 }
439 } else {
440 return restore_i387_soft( &tsk->thread.i387.soft,
441 (struct _fpstate __user *)buf );
442 }
443}
444
445int get_fpxregs( struct user_fxsr_struct __user *buf, struct task_struct *tsk )
446{
447 if ( cpu_has_fxsr ) {
448 if (__copy_to_user( buf, &tsk->thread.i387.fxsave,
449 sizeof(struct user_fxsr_struct) ))
450 return -EFAULT;
451 return 0;
452 } else {
453 return -EIO;
454 }
455}
456
457int set_fpxregs( struct task_struct *tsk, struct user_fxsr_struct __user *buf )
458{
459 int ret = 0;
460
461 if ( cpu_has_fxsr ) {
462 if (__copy_from_user( &tsk->thread.i387.fxsave, buf,
463 sizeof(struct user_fxsr_struct) ))
464 ret = -EFAULT;
465 /* mxcsr reserved bits must be masked to zero for security reasons */
466 tsk->thread.i387.fxsave.mxcsr &= mxcsr_feature_mask;
467 } else {
468 ret = -EIO;
469 }
470 return ret;
471}
472
473/*
474 * FPU state for core dumps.
475 */
476
477static inline void copy_fpu_fsave( struct task_struct *tsk,
478 struct user_i387_struct *fpu )
479{
480 memcpy( fpu, &tsk->thread.i387.fsave,
481 sizeof(struct user_i387_struct) );
482}
483
484static inline void copy_fpu_fxsave( struct task_struct *tsk,
485 struct user_i387_struct *fpu )
486{
487 unsigned short *to;
488 unsigned short *from;
489 int i;
490
491 memcpy( fpu, &tsk->thread.i387.fxsave, 7 * sizeof(long) );
492
493 to = (unsigned short *)&fpu->st_space[0];
494 from = (unsigned short *)&tsk->thread.i387.fxsave.st_space[0];
495 for ( i = 0 ; i < 8 ; i++, to += 5, from += 8 ) {
496 memcpy( to, from, 5 * sizeof(unsigned short) );
497 }
498}
499
500int dump_fpu( struct pt_regs *regs, struct user_i387_struct *fpu )
501{
502 int fpvalid;
503 struct task_struct *tsk = current;
504
505 fpvalid = !!used_math();
506 if ( fpvalid ) {
507 unlazy_fpu( tsk );
508 if ( cpu_has_fxsr ) {
509 copy_fpu_fxsave( tsk, fpu );
510 } else {
511 copy_fpu_fsave( tsk, fpu );
512 }
513 }
514
515 return fpvalid;
516}
517EXPORT_SYMBOL(dump_fpu);
518
519int dump_task_fpu(struct task_struct *tsk, struct user_i387_struct *fpu)
520{
521 int fpvalid = !!tsk_used_math(tsk);
522
523 if (fpvalid) {
524 if (tsk == current)
525 unlazy_fpu(tsk);
526 if (cpu_has_fxsr)
527 copy_fpu_fxsave(tsk, fpu);
528 else
529 copy_fpu_fsave(tsk, fpu);
530 }
531 return fpvalid;
532}
533
534int dump_task_extended_fpu(struct task_struct *tsk, struct user_fxsr_struct *fpu)
535{
536 int fpvalid = tsk_used_math(tsk) && cpu_has_fxsr;
537
538 if (fpvalid) {
539 if (tsk == current)
540 unlazy_fpu(tsk);
541 memcpy(fpu, &tsk->thread.i387.fxsave, sizeof(*fpu));
542 }
543 return fpvalid;
544}
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