bbd426f542
This patch replaces the fpureg_t typedef with a "union fpureg" enabling easier access to 32 & 64 bit values. This allows the access macros used in cp1emu.c to be simplified somewhat. It will also make it easier to expand the width of the FP registers as will be done in a future patch in order to support the 128 bit registers introduced with MSA. No behavioural change is intended by this patch. Signed-off-by: Paul Burton <paul.burton@imgtec.com> Reviewed-by: Qais Yousef <qais.yousef@imgtec.com> Cc: linux-mips@linux-mips.org Patchwork: https://patchwork.linux-mips.org/patch/6532/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
121 lines
2.9 KiB
C
121 lines
2.9 KiB
C
/*
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* Kevin D. Kissell, kevink@mips and Carsten Langgaard, carstenl@mips.com
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* Copyright (C) 2000 MIPS Technologies, Inc. All rights reserved.
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*
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* This program is free software; you can distribute it and/or modify it
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* under the terms of the GNU General Public License (Version 2) as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
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*
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* Routines corresponding to Linux kernel FP context
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* manipulation primitives for the Algorithmics MIPS
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* FPU Emulator
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*/
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#include <linux/sched.h>
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#include <asm/processor.h>
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#include <asm/signal.h>
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#include <asm/uaccess.h>
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#include <asm/fpu.h>
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#include <asm/fpu_emulator.h>
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#define SIGNALLING_NAN 0x7ff800007ff80000LL
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void fpu_emulator_init_fpu(void)
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{
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static int first = 1;
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int i;
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if (first) {
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first = 0;
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printk("Algorithmics/MIPS FPU Emulator v1.5\n");
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}
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current->thread.fpu.fcr31 = 0;
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for (i = 0; i < 32; i++)
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set_fpr64(¤t->thread.fpu.fpr[i], 0, SIGNALLING_NAN);
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}
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/*
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* Emulator context save/restore to/from a signal context
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* presumed to be on the user stack, and therefore accessed
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* with appropriate macros from uaccess.h
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*/
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int fpu_emulator_save_context(struct sigcontext __user *sc)
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{
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int i;
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int err = 0;
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for (i = 0; i < 32; i++) {
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err |=
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__put_user(get_fpr64(¤t->thread.fpu.fpr[i], 0),
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&sc->sc_fpregs[i]);
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}
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err |= __put_user(current->thread.fpu.fcr31, &sc->sc_fpc_csr);
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return err;
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}
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int fpu_emulator_restore_context(struct sigcontext __user *sc)
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{
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int i;
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int err = 0;
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u64 fpr_val;
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for (i = 0; i < 32; i++) {
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err |= __get_user(fpr_val, &sc->sc_fpregs[i]);
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set_fpr64(¤t->thread.fpu.fpr[i], 0, fpr_val);
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}
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err |= __get_user(current->thread.fpu.fcr31, &sc->sc_fpc_csr);
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return err;
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}
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#ifdef CONFIG_64BIT
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/*
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* This is the o32 version
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*/
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int fpu_emulator_save_context32(struct sigcontext32 __user *sc)
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{
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int i;
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int err = 0;
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int inc = test_thread_flag(TIF_32BIT_FPREGS) ? 2 : 1;
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for (i = 0; i < 32; i += inc) {
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err |=
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__put_user(get_fpr64(¤t->thread.fpu.fpr[i], 0),
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&sc->sc_fpregs[i]);
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}
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err |= __put_user(current->thread.fpu.fcr31, &sc->sc_fpc_csr);
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return err;
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}
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int fpu_emulator_restore_context32(struct sigcontext32 __user *sc)
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{
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int i;
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int err = 0;
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int inc = test_thread_flag(TIF_32BIT_FPREGS) ? 2 : 1;
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u64 fpr_val;
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for (i = 0; i < 32; i += inc) {
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err |= __get_user(fpr_val, &sc->sc_fpregs[i]);
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set_fpr64(¤t->thread.fpu.fpr[i], 0, fpr_val);
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}
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err |= __get_user(current->thread.fpu.fcr31, &sc->sc_fpc_csr);
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return err;
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}
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#endif
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