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/*
* 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;
int inc = test_thread_flag(TIF_32BIT_FPREGS) ? 2 : 1;
for (i = 0; i < 32; i += inc) {
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;
int inc = test_thread_flag(TIF_32BIT_FPREGS) ? 2 : 1;
for (i = 0; i < 32; i += inc) {
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
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