+++ /dev/null
-/*
- * This file is subject to the terms and conditions of the GNU General Public
- * License. See the file "COPYING" in the main directory of this archive
- * for more details.
- *
- * arch/sh64/kernel/fpu.c
- *
- * Copyright (C) 2001 Manuela Cirronis, Paolo Alberelli
- * Copyright (C) 2002 STMicroelectronics Limited
- * Author : Stuart Menefy
- *
- * Started from SH4 version:
- * Copyright (C) 1999, 2000 Kaz Kojima & Niibe Yutaka
- *
- */
-
-#include <linux/sched.h>
-#include <linux/signal.h>
-#include <asm/processor.h>
-#include <asm/user.h>
-#include <asm/io.h>
-
-/*
- * Initially load the FPU with signalling NANS. This bit pattern
- * has the property that no matter whether considered as single or as
- * double precision, it still represents a signalling NAN.
- */
-#define sNAN64 0xFFFFFFFFFFFFFFFFULL
-#define sNAN32 0xFFFFFFFFUL
-
-static union sh_fpu_union init_fpuregs = {
- .hard = {
- .fp_regs = { [0 ... 63] = sNAN32 },
- .fpscr = FPSCR_INIT
- }
-};
-
-inline void fpsave(struct sh_fpu_hard_struct *fpregs)
-{
- asm volatile("fst.p %0, (0*8), fp0\n\t"
- "fst.p %0, (1*8), fp2\n\t"
- "fst.p %0, (2*8), fp4\n\t"
- "fst.p %0, (3*8), fp6\n\t"
- "fst.p %0, (4*8), fp8\n\t"
- "fst.p %0, (5*8), fp10\n\t"
- "fst.p %0, (6*8), fp12\n\t"
- "fst.p %0, (7*8), fp14\n\t"
- "fst.p %0, (8*8), fp16\n\t"
- "fst.p %0, (9*8), fp18\n\t"
- "fst.p %0, (10*8), fp20\n\t"
- "fst.p %0, (11*8), fp22\n\t"
- "fst.p %0, (12*8), fp24\n\t"
- "fst.p %0, (13*8), fp26\n\t"
- "fst.p %0, (14*8), fp28\n\t"
- "fst.p %0, (15*8), fp30\n\t"
- "fst.p %0, (16*8), fp32\n\t"
- "fst.p %0, (17*8), fp34\n\t"
- "fst.p %0, (18*8), fp36\n\t"
- "fst.p %0, (19*8), fp38\n\t"
- "fst.p %0, (20*8), fp40\n\t"
- "fst.p %0, (21*8), fp42\n\t"
- "fst.p %0, (22*8), fp44\n\t"
- "fst.p %0, (23*8), fp46\n\t"
- "fst.p %0, (24*8), fp48\n\t"
- "fst.p %0, (25*8), fp50\n\t"
- "fst.p %0, (26*8), fp52\n\t"
- "fst.p %0, (27*8), fp54\n\t"
- "fst.p %0, (28*8), fp56\n\t"
- "fst.p %0, (29*8), fp58\n\t"
- "fst.p %0, (30*8), fp60\n\t"
- "fst.p %0, (31*8), fp62\n\t"
-
- "fgetscr fr63\n\t"
- "fst.s %0, (32*8), fr63\n\t"
- : /* no output */
- : "r" (fpregs)
- : "memory");
-}
-
-
-static inline void
-fpload(struct sh_fpu_hard_struct *fpregs)
-{
- asm volatile("fld.p %0, (0*8), fp0\n\t"
- "fld.p %0, (1*8), fp2\n\t"
- "fld.p %0, (2*8), fp4\n\t"
- "fld.p %0, (3*8), fp6\n\t"
- "fld.p %0, (4*8), fp8\n\t"
- "fld.p %0, (5*8), fp10\n\t"
- "fld.p %0, (6*8), fp12\n\t"
- "fld.p %0, (7*8), fp14\n\t"
- "fld.p %0, (8*8), fp16\n\t"
- "fld.p %0, (9*8), fp18\n\t"
- "fld.p %0, (10*8), fp20\n\t"
- "fld.p %0, (11*8), fp22\n\t"
- "fld.p %0, (12*8), fp24\n\t"
- "fld.p %0, (13*8), fp26\n\t"
- "fld.p %0, (14*8), fp28\n\t"
- "fld.p %0, (15*8), fp30\n\t"
- "fld.p %0, (16*8), fp32\n\t"
- "fld.p %0, (17*8), fp34\n\t"
- "fld.p %0, (18*8), fp36\n\t"
- "fld.p %0, (19*8), fp38\n\t"
- "fld.p %0, (20*8), fp40\n\t"
- "fld.p %0, (21*8), fp42\n\t"
- "fld.p %0, (22*8), fp44\n\t"
- "fld.p %0, (23*8), fp46\n\t"
- "fld.p %0, (24*8), fp48\n\t"
- "fld.p %0, (25*8), fp50\n\t"
- "fld.p %0, (26*8), fp52\n\t"
- "fld.p %0, (27*8), fp54\n\t"
- "fld.p %0, (28*8), fp56\n\t"
- "fld.p %0, (29*8), fp58\n\t"
- "fld.p %0, (30*8), fp60\n\t"
-
- "fld.s %0, (32*8), fr63\n\t"
- "fputscr fr63\n\t"
-
- "fld.p %0, (31*8), fp62\n\t"
- : /* no output */
- : "r" (fpregs) );
-}
-
-void fpinit(struct sh_fpu_hard_struct *fpregs)
-{
- *fpregs = init_fpuregs.hard;
-}
-
-asmlinkage void
-do_fpu_error(unsigned long ex, struct pt_regs *regs)
-{
- struct task_struct *tsk = current;
-
- regs->pc += 4;
-
- tsk->thread.trap_no = 11;
- tsk->thread.error_code = 0;
- force_sig(SIGFPE, tsk);
-}
-
-
-asmlinkage void
-do_fpu_state_restore(unsigned long ex, struct pt_regs *regs)
-{
- void die(const char *str, struct pt_regs *regs, long err);
-
- if (! user_mode(regs))
- die("FPU used in kernel", regs, ex);
-
- regs->sr &= ~SR_FD;
-
- if (last_task_used_math == current)
- return;
-
- grab_fpu();
- if (last_task_used_math != NULL) {
- /* Other processes fpu state, save away */
- fpsave(&last_task_used_math->thread.fpu.hard);
- }
- last_task_used_math = current;
- if (used_math()) {
- fpload(¤t->thread.fpu.hard);
- } else {
- /* First time FPU user. */
- fpload(&init_fpuregs.hard);
- set_used_math();
- }
- release_fpu();
-}
-
git.openpandora.org / pandora-kernel.git / blobdiff