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Diffstat (limited to 'arch/sh/kernel/cpu/sh2a/fpu.c')
-rw-r--r--arch/sh/kernel/cpu/sh2a/fpu.c111
1 files changed, 23 insertions, 88 deletions
diff --git a/arch/sh/kernel/cpu/sh2a/fpu.c b/arch/sh/kernel/cpu/sh2a/fpu.c
index d395ce5740e7..488d24e0cdf0 100644
--- a/arch/sh/kernel/cpu/sh2a/fpu.c
+++ b/arch/sh/kernel/cpu/sh2a/fpu.c
@@ -26,8 +26,7 @@
26/* 26/*
27 * Save FPU registers onto task structure. 27 * Save FPU registers onto task structure.
28 */ 28 */
29void 29void save_fpu(struct task_struct *tsk)
30save_fpu(struct task_struct *tsk)
31{ 30{
32 unsigned long dummy; 31 unsigned long dummy;
33 32
@@ -52,7 +51,7 @@ save_fpu(struct task_struct *tsk)
52 "fmov.s fr0, @-%0\n\t" 51 "fmov.s fr0, @-%0\n\t"
53 "lds %3, fpscr\n\t" 52 "lds %3, fpscr\n\t"
54 : "=r" (dummy) 53 : "=r" (dummy)
55 : "0" ((char *)(&tsk->thread.fpu.hard.status)), 54 : "0" ((char *)(&tsk->thread.xstate->hardfpu.status)),
56 "r" (FPSCR_RCHG), 55 "r" (FPSCR_RCHG),
57 "r" (FPSCR_INIT) 56 "r" (FPSCR_INIT)
58 : "memory"); 57 : "memory");
@@ -60,8 +59,7 @@ save_fpu(struct task_struct *tsk)
60 disable_fpu(); 59 disable_fpu();
61} 60}
62 61
63static void 62void restore_fpu(struct task_struct *tsk)
64restore_fpu(struct task_struct *tsk)
65{ 63{
66 unsigned long dummy; 64 unsigned long dummy;
67 65
@@ -85,45 +83,12 @@ restore_fpu(struct task_struct *tsk)
85 "lds.l @%0+, fpscr\n\t" 83 "lds.l @%0+, fpscr\n\t"
86 "lds.l @%0+, fpul\n\t" 84 "lds.l @%0+, fpul\n\t"
87 : "=r" (dummy) 85 : "=r" (dummy)
88 : "0" (&tsk->thread.fpu), "r" (FPSCR_RCHG) 86 : "0" (tsk->thread.xstate), "r" (FPSCR_RCHG)
89 : "memory"); 87 : "memory");
90 disable_fpu(); 88 disable_fpu();
91} 89}
92 90
93/* 91/*
94 * Load the FPU with signalling NANS. This bit pattern we're using
95 * has the property that no matter wether considered as single or as
96 * double precission represents signaling NANS.
97 */
98
99static void
100fpu_init(void)
101{
102 enable_fpu();
103 asm volatile("lds %0, fpul\n\t"
104 "fsts fpul, fr0\n\t"
105 "fsts fpul, fr1\n\t"
106 "fsts fpul, fr2\n\t"
107 "fsts fpul, fr3\n\t"
108 "fsts fpul, fr4\n\t"
109 "fsts fpul, fr5\n\t"
110 "fsts fpul, fr6\n\t"
111 "fsts fpul, fr7\n\t"
112 "fsts fpul, fr8\n\t"
113 "fsts fpul, fr9\n\t"
114 "fsts fpul, fr10\n\t"
115 "fsts fpul, fr11\n\t"
116 "fsts fpul, fr12\n\t"
117 "fsts fpul, fr13\n\t"
118 "fsts fpul, fr14\n\t"
119 "fsts fpul, fr15\n\t"
120 "lds %2, fpscr\n\t"
121 : /* no output */
122 : "r" (0), "r" (FPSCR_RCHG), "r" (FPSCR_INIT));
123 disable_fpu();
124}
125
126/*
127 * Emulate arithmetic ops on denormalized number for some FPU insns. 92 * Emulate arithmetic ops on denormalized number for some FPU insns.
128 */ 93 */
129 94
@@ -490,9 +455,9 @@ ieee_fpe_handler (struct pt_regs *regs)
490 if ((finsn & 0xf1ff) == 0xf0ad) { /* fcnvsd */ 455 if ((finsn & 0xf1ff) == 0xf0ad) { /* fcnvsd */
491 struct task_struct *tsk = current; 456 struct task_struct *tsk = current;
492 457
493 if ((tsk->thread.fpu.hard.fpscr & FPSCR_FPU_ERROR)) { 458 if ((tsk->thread.xstate->hardfpu.fpscr & FPSCR_FPU_ERROR)) {
494 /* FPU error */ 459 /* FPU error */
495 denormal_to_double (&tsk->thread.fpu.hard, 460 denormal_to_double (&tsk->thread.xstate->hardfpu,
496 (finsn >> 8) & 0xf); 461 (finsn >> 8) & 0xf);
497 } else 462 } else
498 return 0; 463 return 0;
@@ -507,9 +472,9 @@ ieee_fpe_handler (struct pt_regs *regs)
507 472
508 n = (finsn >> 8) & 0xf; 473 n = (finsn >> 8) & 0xf;
509 m = (finsn >> 4) & 0xf; 474 m = (finsn >> 4) & 0xf;
510 hx = tsk->thread.fpu.hard.fp_regs[n]; 475 hx = tsk->thread.xstate->hardfpu.fp_regs[n];
511 hy = tsk->thread.fpu.hard.fp_regs[m]; 476 hy = tsk->thread.xstate->hardfpu.fp_regs[m];
512 fpscr = tsk->thread.fpu.hard.fpscr; 477 fpscr = tsk->thread.xstate->hardfpu.fpscr;
513 prec = fpscr & (1 << 19); 478 prec = fpscr & (1 << 19);
514 479
515 if ((fpscr & FPSCR_FPU_ERROR) 480 if ((fpscr & FPSCR_FPU_ERROR)
@@ -519,15 +484,15 @@ ieee_fpe_handler (struct pt_regs *regs)
519 484
520 /* FPU error because of denormal */ 485 /* FPU error because of denormal */
521 llx = ((long long) hx << 32) 486 llx = ((long long) hx << 32)
522 | tsk->thread.fpu.hard.fp_regs[n+1]; 487 | tsk->thread.xstate->hardfpu.fp_regs[n+1];
523 lly = ((long long) hy << 32) 488 lly = ((long long) hy << 32)
524 | tsk->thread.fpu.hard.fp_regs[m+1]; 489 | tsk->thread.xstate->hardfpu.fp_regs[m+1];
525 if ((hx & 0x7fffffff) >= 0x00100000) 490 if ((hx & 0x7fffffff) >= 0x00100000)
526 llx = denormal_muld(lly, llx); 491 llx = denormal_muld(lly, llx);
527 else 492 else
528 llx = denormal_muld(llx, lly); 493 llx = denormal_muld(llx, lly);
529 tsk->thread.fpu.hard.fp_regs[n] = llx >> 32; 494 tsk->thread.xstate->hardfpu.fp_regs[n] = llx >> 32;
530 tsk->thread.fpu.hard.fp_regs[n+1] = llx & 0xffffffff; 495 tsk->thread.xstate->hardfpu.fp_regs[n+1] = llx & 0xffffffff;
531 } else if ((fpscr & FPSCR_FPU_ERROR) 496 } else if ((fpscr & FPSCR_FPU_ERROR)
532 && (!prec && ((hx & 0x7fffffff) < 0x00800000 497 && (!prec && ((hx & 0x7fffffff) < 0x00800000
533 || (hy & 0x7fffffff) < 0x00800000))) { 498 || (hy & 0x7fffffff) < 0x00800000))) {
@@ -536,7 +501,7 @@ ieee_fpe_handler (struct pt_regs *regs)
536 hx = denormal_mulf(hy, hx); 501 hx = denormal_mulf(hy, hx);
537 else 502 else
538 hx = denormal_mulf(hx, hy); 503 hx = denormal_mulf(hx, hy);
539 tsk->thread.fpu.hard.fp_regs[n] = hx; 504 tsk->thread.xstate->hardfpu.fp_regs[n] = hx;
540 } else 505 } else
541 return 0; 506 return 0;
542 507
@@ -550,9 +515,9 @@ ieee_fpe_handler (struct pt_regs *regs)
550 515
551 n = (finsn >> 8) & 0xf; 516 n = (finsn >> 8) & 0xf;
552 m = (finsn >> 4) & 0xf; 517 m = (finsn >> 4) & 0xf;
553 hx = tsk->thread.fpu.hard.fp_regs[n]; 518 hx = tsk->thread.xstate->hardfpu.fp_regs[n];
554 hy = tsk->thread.fpu.hard.fp_regs[m]; 519 hy = tsk->thread.xstate->hardfpu.fp_regs[m];
555 fpscr = tsk->thread.fpu.hard.fpscr; 520 fpscr = tsk->thread.xstate->hardfpu.fpscr;
556 prec = fpscr & (1 << 19); 521 prec = fpscr & (1 << 19);
557 522
558 if ((fpscr & FPSCR_FPU_ERROR) 523 if ((fpscr & FPSCR_FPU_ERROR)
@@ -562,15 +527,15 @@ ieee_fpe_handler (struct pt_regs *regs)
562 527
563 /* FPU error because of denormal */ 528 /* FPU error because of denormal */
564 llx = ((long long) hx << 32) 529 llx = ((long long) hx << 32)
565 | tsk->thread.fpu.hard.fp_regs[n+1]; 530 | tsk->thread.xstate->hardfpu.fp_regs[n+1];
566 lly = ((long long) hy << 32) 531 lly = ((long long) hy << 32)
567 | tsk->thread.fpu.hard.fp_regs[m+1]; 532 | tsk->thread.xstate->hardfpu.fp_regs[m+1];
568 if ((finsn & 0xf00f) == 0xf000) 533 if ((finsn & 0xf00f) == 0xf000)
569 llx = denormal_addd(llx, lly); 534 llx = denormal_addd(llx, lly);
570 else 535 else
571 llx = denormal_addd(llx, lly ^ (1LL << 63)); 536 llx = denormal_addd(llx, lly ^ (1LL << 63));
572 tsk->thread.fpu.hard.fp_regs[n] = llx >> 32; 537 tsk->thread.xstate->hardfpu.fp_regs[n] = llx >> 32;
573 tsk->thread.fpu.hard.fp_regs[n+1] = llx & 0xffffffff; 538 tsk->thread.xstate->hardfpu.fp_regs[n+1] = llx & 0xffffffff;
574 } else if ((fpscr & FPSCR_FPU_ERROR) 539 } else if ((fpscr & FPSCR_FPU_ERROR)
575 && (!prec && ((hx & 0x7fffffff) < 0x00800000 540 && (!prec && ((hx & 0x7fffffff) < 0x00800000
576 || (hy & 0x7fffffff) < 0x00800000))) { 541 || (hy & 0x7fffffff) < 0x00800000))) {
@@ -579,7 +544,7 @@ ieee_fpe_handler (struct pt_regs *regs)
579 hx = denormal_addf(hx, hy); 544 hx = denormal_addf(hx, hy);
580 else 545 else
581 hx = denormal_addf(hx, hy ^ 0x80000000); 546 hx = denormal_addf(hx, hy ^ 0x80000000);
582 tsk->thread.fpu.hard.fp_regs[n] = hx; 547 tsk->thread.xstate->hardfpu.fp_regs[n] = hx;
583 } else 548 } else
584 return 0; 549 return 0;
585 550
@@ -597,7 +562,7 @@ BUILD_TRAP_HANDLER(fpu_error)
597 562
598 __unlazy_fpu(tsk, regs); 563 __unlazy_fpu(tsk, regs);
599 if (ieee_fpe_handler(regs)) { 564 if (ieee_fpe_handler(regs)) {
600 tsk->thread.fpu.hard.fpscr &= 565 tsk->thread.xstate->hardfpu.fpscr &=
601 ~(FPSCR_CAUSE_MASK | FPSCR_FLAG_MASK); 566 ~(FPSCR_CAUSE_MASK | FPSCR_FLAG_MASK);
602 grab_fpu(regs); 567 grab_fpu(regs);
603 restore_fpu(tsk); 568 restore_fpu(tsk);
@@ -607,33 +572,3 @@ BUILD_TRAP_HANDLER(fpu_error)
607 572
608 force_sig(SIGFPE, tsk); 573 force_sig(SIGFPE, tsk);
609} 574}
610
611void fpu_state_restore(struct pt_regs *regs)
612{
613 struct task_struct *tsk = current;
614
615 grab_fpu(regs);
616 if (unlikely(!user_mode(regs))) {
617 printk(KERN_ERR "BUG: FPU is used in kernel mode.\n");
618 BUG();
619 return;
620 }
621
622 if (likely(used_math())) {
623 /* Using the FPU again. */
624 restore_fpu(tsk);
625 } else {
626 /* First time FPU user. */
627 fpu_init();
628 set_used_math();
629 }
630 task_thread_info(tsk)->status |= TS_USEDFPU;
631 tsk->fpu_counter++;
632}
633
634BUILD_TRAP_HANDLER(fpu_state_restore)
635{
636 TRAP_HANDLER_DECL;
637
638 fpu_state_restore(regs);
639}
generated by cgit v1.2.2 (git 2.25.0) at 2024-11-20 13:00:39 -0500