[deliverable/linux.git] / arch / mips / math-emu / kernel_linkage.c

/*
 *  Kevin D. Kissell, kevink@mips and Carsten Langgaard, carstenl@mips.com
 *  Copyright (C) 2000 MIPS Technologies, Inc.  All rights reserved.
 *
 *  This program is free software; you can distribute it and/or modify it
 *  under the terms of the GNU General Public License (Version 2) as
 *  published by the Free Software Foundation.
 *
 *  This program is distributed in the hope it will be useful, but WITHOUT
 *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 *  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 *  for more details.
 *
 *  You should have received a copy of the GNU General Public License along
 *  with this program; if not, write to the Free Software Foundation, Inc.,
 *  59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
 *
 * Routines corresponding to Linux kernel FP context
 * manipulation primitives for the Algorithmics MIPS
 * FPU Emulator
 */
#include <linux/sched.h>
#include <asm/processor.h>
#include <asm/signal.h>
#include <asm/uaccess.h>

#include <asm/fpu.h>
#include <asm/fpu_emulator.h>

#define SIGNALLING_NAN 0x7ff800007ff80000LL

void fpu_emulator_init_fpu(void)
{
	static int first = 1;
	int i;

	if (first) {
		first = 0;
		printk("Algorithmics/MIPS FPU Emulator v1.5\n");
	}

	current->thread.fpu.fcr31 = 0;
	for (i = 0; i < 32; i++) {
		current->thread.fpu.fpr[i] = SIGNALLING_NAN;
	}
}


/*
 * Emulator context save/restore to/from a signal context
 * presumed to be on the user stack, and therefore accessed
 * with appropriate macros from uaccess.h
 */

int fpu_emulator_save_context(struct sigcontext __user *sc)
{
	int i;
	int err = 0;

	for (i = 0; i < 32; i++) {
		err |=
		    __put_user(current->thread.fpu.fpr[i], &sc->sc_fpregs[i]);
	}
	err |= __put_user(current->thread.fpu.fcr31, &sc->sc_fpc_csr);

	return err;
}

int fpu_emulator_restore_context(struct sigcontext __user *sc)
{
	int i;
	int err = 0;

	for (i = 0; i < 32; i++) {
		err |=
		    __get_user(current->thread.fpu.fpr[i], &sc->sc_fpregs[i]);
	}
	err |= __get_user(current->thread.fpu.fcr31, &sc->sc_fpc_csr);

	return err;
}

#ifdef CONFIG_64BIT
/*
 * This is the o32 version
 */

int fpu_emulator_save_context32(struct sigcontext32 __user *sc)
{
	int i;
	int err = 0;

	for (i = 0; i < 32; i+=2) {
		err |=
		    __put_user(current->thread.fpu.fpr[i], &sc->sc_fpregs[i]);
	}
	err |= __put_user(current->thread.fpu.fcr31, &sc->sc_fpc_csr);

	return err;
}

int fpu_emulator_restore_context32(struct sigcontext32 __user *sc)
{
	int i;
	int err = 0;

	for (i = 0; i < 32; i+=2) {
		err |=
		    __get_user(current->thread.fpu.fpr[i], &sc->sc_fpregs[i]);
	}
	err |= __get_user(current->thread.fpu.fcr31, &sc->sc_fpc_csr);

	return err;
}
#endif
Commit	Line	Data
1da177e4 LT	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	*/
1da177e4 LT	22	#include <linux/sched.h>
	23	#include <asm/processor.h>
	24	#include <asm/signal.h>
	25	#include <asm/uaccess.h>
	26
f028b860	27	#include <asm/fpu.h>
1da177e4 LT	28	#include <asm/fpu_emulator.h>
1da177e4 LT	29
1da177e4 LT	30	#define SIGNALLING_NAN 0x7ff800007ff80000LL
	31
	32	void 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
eae89076	42	current->thread.fpu.fcr31 = 0;
1da177e4	43	for (i = 0; i < 32; i++) {
eae89076	44	current->thread.fpu.fpr[i] = SIGNALLING_NAN;
1da177e4 LT	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
53dc8028	55	int fpu_emulator_save_context(struct sigcontext __user *sc)
1da177e4 LT	56	{
	57	int i;
	58	int err = 0;
	59
	60	for (i = 0; i < 32; i++) {
	61	err \|=
eae89076	62	__put_user(current->thread.fpu.fpr[i], &sc->sc_fpregs[i]);
1da177e4	63	}
eae89076	64	err \|= __put_user(current->thread.fpu.fcr31, &sc->sc_fpc_csr);
1da177e4 LT	65
	66	return err;
	67	}
	68
53dc8028	69	int fpu_emulator_restore_context(struct sigcontext __user *sc)
1da177e4 LT	70	{
	71	int i;
	72	int err = 0;
	73
	74	for (i = 0; i < 32; i++) {
	75	err \|=
eae89076	76	__get_user(current->thread.fpu.fpr[i], &sc->sc_fpregs[i]);
1da177e4	77	}
eae89076	78	err \|= __get_user(current->thread.fpu.fcr31, &sc->sc_fpc_csr);
1da177e4 LT	79
	80	return err;
	81	}
	82
875d43e7	83	#ifdef CONFIG_64BIT
1da177e4 LT	84	/*
	85	* This is the o32 version
	86	*/
	87
53dc8028	88	int fpu_emulator_save_context32(struct sigcontext32 __user *sc)
1da177e4 LT	89	{
	90	int i;
	91	int err = 0;
	92
	93	for (i = 0; i < 32; i+=2) {
	94	err \|=
eae89076	95	__put_user(current->thread.fpu.fpr[i], &sc->sc_fpregs[i]);
1da177e4	96	}
eae89076	97	err \|= __put_user(current->thread.fpu.fcr31, &sc->sc_fpc_csr);
1da177e4 LT	98
	99	return err;
	100	}
	101
53dc8028	102	int fpu_emulator_restore_context32(struct sigcontext32 __user *sc)
1da177e4 LT	103	{
	104	int i;
	105	int err = 0;
	106
	107	for (i = 0; i < 32; i+=2) {
	108	err \|=
eae89076	109	__get_user(current->thread.fpu.fpr[i], &sc->sc_fpregs[i]);
1da177e4	110	}
eae89076	111	err \|= __get_user(current->thread.fpu.fcr31, &sc->sc_fpc_csr);
1da177e4 LT	112
	113	return err;
	114	}
	115	#endif