diff options
Diffstat (limited to 'arch/mips/math-emu/kernel_linkage.c')
| -rw-r--r-- | arch/mips/math-emu/kernel_linkage.c | 125 |
1 files changed, 125 insertions, 0 deletions
diff --git a/arch/mips/math-emu/kernel_linkage.c b/arch/mips/math-emu/kernel_linkage.c new file mode 100644 index 00000000000..04397fec30f --- /dev/null +++ b/arch/mips/math-emu/kernel_linkage.c @@ -0,0 +1,125 @@ +/* + * 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/config.h> +#include <linux/sched.h> +#include <asm/processor.h> +#include <asm/signal.h> +#include <asm/uaccess.h> + +#include <asm/fpu_emulator.h> + +extern struct mips_fpu_emulator_private fpuemuprivate; + +#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.soft.fcr31 = 0; + for (i = 0; i < 32; i++) { + current->thread.fpu.soft.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 *sc) +{ + int i; + int err = 0; + + for (i = 0; i < 32; i++) { + err |= + __put_user(current->thread.fpu.soft.fpr[i], + &sc->sc_fpregs[i]); + } + err |= __put_user(current->thread.fpu.soft.fcr31, &sc->sc_fpc_csr); + err |= __put_user(fpuemuprivate.eir, &sc->sc_fpc_eir); + + return err; +} + +int fpu_emulator_restore_context(struct sigcontext *sc) +{ + int i; + int err = 0; + + for (i = 0; i < 32; i++) { + err |= + __get_user(current->thread.fpu.soft.fpr[i], + &sc->sc_fpregs[i]); + } + err |= __get_user(current->thread.fpu.soft.fcr31, &sc->sc_fpc_csr); + err |= __get_user(fpuemuprivate.eir, &sc->sc_fpc_eir); + + return err; +} + +#ifdef CONFIG_MIPS64 +/* + * This is the o32 version + */ + +int fpu_emulator_save_context32(struct sigcontext32 *sc) +{ + int i; + int err = 0; + + for (i = 0; i < 32; i+=2) { + err |= + __put_user(current->thread.fpu.soft.fpr[i], + &sc->sc_fpregs[i]); + } + err |= __put_user(current->thread.fpu.soft.fcr31, &sc->sc_fpc_csr); + err |= __put_user(fpuemuprivate.eir, &sc->sc_fpc_eir); + + return err; +} + +int fpu_emulator_restore_context32(struct sigcontext32 *sc) +{ + int i; + int err = 0; + + for (i = 0; i < 32; i+=2) { + err |= + __get_user(current->thread.fpu.soft.fpr[i], + &sc->sc_fpregs[i]); + } + err |= __get_user(current->thread.fpu.soft.fcr31, &sc->sc_fpc_csr); + err |= __get_user(fpuemuprivate.eir, &sc->sc_fpc_eir); + + return err; +} +#endif |