1/*
  2 *  Kevin D. Kissell, kevink@mips and Carsten Langgaard, carstenl@mips.com
  3 *  Copyright (C) 2000 MIPS Technologies, Inc.  All rights reserved.
  4 *
  5 *  This program is free software; you can distribute it and/or modify it
  6 *  under the terms of the GNU General Public License (Version 2) as
  7 *  published by the Free Software Foundation.
  8 *
  9 *  This program is distributed in the hope it will be useful, but WITHOUT
 10 *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 11 *  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 12 *  for more details.
 13 *
 14 *  You should have received a copy of the GNU General Public License along
 15 *  with this program; if not, write to the Free Software Foundation, Inc.,
 16 *  59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
 17 *
 18 * Routines corresponding to Linux kernel FP context
 19 * manipulation primitives for the Algorithmics MIPS
 20 * FPU Emulator
 21 */
 22#include <linux/sched.h>
 23#include <asm/processor.h>
 24#include <asm/signal.h>
 25#include <asm/uaccess.h>
 26
 27#include <asm/fpu.h>
 28#include <asm/fpu_emulator.h>
 29
 30#define SIGNALLING_NAN 0x7ff800007ff80000LL
 31
 32void fpu_emulator_init_fpu(void)
 33{
 34	static int first = 1;
 35	int i;
 36
 37	if (first) {
 38		first = 0;
 39		printk("Algorithmics/MIPS FPU Emulator v1.5\n");
 40	}
 41
 42	current->thread.fpu.fcr31 = 0;
 43	for (i = 0; i < 32; i++) {
 44		current->thread.fpu.fpr[i] = SIGNALLING_NAN;
 45	}
 46}
 47
 48
 49/*
 50 * Emulator context save/restore to/from a signal context
 51 * presumed to be on the user stack, and therefore accessed
 52 * with appropriate macros from uaccess.h
 53 */
 54
 55int fpu_emulator_save_context(struct sigcontext __user *sc)
 56{
 57	int i;
 58	int err = 0;
 59
 60	for (i = 0; i < 32; i++) {
 61		err |=
 62		    __put_user(current->thread.fpu.fpr[i], &sc->sc_fpregs[i]);
 63	}
 64	err |= __put_user(current->thread.fpu.fcr31, &sc->sc_fpc_csr);
 65
 66	return err;
 67}
 68
 69int fpu_emulator_restore_context(struct sigcontext __user *sc)
 70{
 71	int i;
 72	int err = 0;
 73
 74	for (i = 0; i < 32; i++) {
 75		err |=
 76		    __get_user(current->thread.fpu.fpr[i], &sc->sc_fpregs[i]);
 77	}
 78	err |= __get_user(current->thread.fpu.fcr31, &sc->sc_fpc_csr);
 79
 80	return err;
 81}
 82
 83#ifdef CONFIG_64BIT
 84/*
 85 * This is the o32 version
 86 */
 87
 88int fpu_emulator_save_context32(struct sigcontext32 __user *sc)
 89{
 90	int i;
 91	int err = 0;
 92
 93	for (i = 0; i < 32; i+=2) {
 94		err |=
 95		    __put_user(current->thread.fpu.fpr[i], &sc->sc_fpregs[i]);
 96	}
 97	err |= __put_user(current->thread.fpu.fcr31, &sc->sc_fpc_csr);
 98
 99	return err;
100}
101
102int fpu_emulator_restore_context32(struct sigcontext32 __user *sc)
103{
104	int i;
105	int err = 0;
106
107	for (i = 0; i < 32; i+=2) {
108		err |=
109		    __get_user(current->thread.fpu.fpr[i], &sc->sc_fpregs[i]);
110	}
111	err |= __get_user(current->thread.fpu.fcr31, &sc->sc_fpc_csr);
112
113	return err;
114}
115#endif

 1/*
 2 *  Kevin D. Kissell, kevink@mips and Carsten Langgaard, carstenl@mips.com
 3 *  Copyright (C) 2000 MIPS Technologies, Inc.	All rights reserved.
 4 *
 5 *  This program is free software; you can distribute it and/or modify it
 6 *  under the terms of the GNU General Public License (Version 2) as
 7 *  published by the Free Software Foundation.
 8 *
 9 *  This program is distributed in the hope it will be useful, but WITHOUT
10 *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 *  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
12 *  for more details.
13 *
14 *  You should have received a copy of the GNU General Public License along
15 *  with this program; if not, write to the Free Software Foundation, Inc.,
16 *  59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
17 *
18 * Routines corresponding to Linux kernel FP context
19 * manipulation primitives for the Algorithmics MIPS
20 * FPU Emulator
21 */
22#include <linux/sched.h>
23#include <asm/processor.h>
24#include <asm/signal.h>
25#include <asm/uaccess.h>
26
27#include <asm/fpu.h>
28#include <asm/fpu_emulator.h>
29
30#define SIGNALLING_NAN 0x7ff800007ff80000LL
31
32void fpu_emulator_init_fpu(void)
33{
34	static int first = 1;
35	int i;
36
37	if (first) {
38		first = 0;
39		printk("Algorithmics/MIPS FPU Emulator v1.5\n");
40	}
41
42	current->thread.fpu.fcr31 = 0;
43	for (i = 0; i < 32; i++)
44		set_fpr64(&current->thread.fpu.fpr[i], 0, SIGNALLING_NAN);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
45}