/* * 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