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 116