| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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/config.h> |
| 23 | #include <linux/sched.h> |
| 24 | #include <asm/processor.h> |
| 25 | #include <asm/signal.h> |
| 26 | #include <asm/uaccess.h> |
| 27 | |
| 28 | #include <asm/fpu_emulator.h> |
| 29 | |
| 30 | extern struct mips_fpu_emulator_private fpuemuprivate; |
| 31 | |
| 32 | #define SIGNALLING_NAN 0x7ff800007ff80000LL |
| 33 | |
| 34 | void fpu_emulator_init_fpu(void) |
| 35 | { |
| 36 | static int first = 1; |
| 37 | int i; |
| 38 | |
| 39 | if (first) { |
| 40 | first = 0; |
| 41 | printk("Algorithmics/MIPS FPU Emulator v1.5\n"); |
| 42 | } |
| 43 | |
| 44 | current->thread.fpu.soft.fcr31 = 0; |
| 45 | for (i = 0; i < 32; i++) { |
| 46 | current->thread.fpu.soft.fpr[i] = SIGNALLING_NAN; |
| 47 | } |
| 48 | } |
| 49 | |
| 50 | |
| 51 | /* |
| 52 | * Emulator context save/restore to/from a signal context |
| 53 | * presumed to be on the user stack, and therefore accessed |
| 54 | * with appropriate macros from uaccess.h |
| 55 | */ |
| 56 | |
| 57 | int fpu_emulator_save_context(struct sigcontext *sc) |
| 58 | { |
| 59 | int i; |
| 60 | int err = 0; |
| 61 | |
| 62 | for (i = 0; i < 32; i++) { |
| 63 | err |= |
| 64 | __put_user(current->thread.fpu.soft.fpr[i], |
| 65 | &sc->sc_fpregs[i]); |
| 66 | } |
| 67 | err |= __put_user(current->thread.fpu.soft.fcr31, &sc->sc_fpc_csr); |
| 68 | err |= __put_user(fpuemuprivate.eir, &sc->sc_fpc_eir); |
| 69 | |
| 70 | return err; |
| 71 | } |
| 72 | |
| 73 | int fpu_emulator_restore_context(struct sigcontext *sc) |
| 74 | { |
| 75 | int i; |
| 76 | int err = 0; |
| 77 | |
| 78 | for (i = 0; i < 32; i++) { |
| 79 | err |= |
| 80 | __get_user(current->thread.fpu.soft.fpr[i], |
| 81 | &sc->sc_fpregs[i]); |
| 82 | } |
| 83 | err |= __get_user(current->thread.fpu.soft.fcr31, &sc->sc_fpc_csr); |
| 84 | err |= __get_user(fpuemuprivate.eir, &sc->sc_fpc_eir); |
| 85 | |
| 86 | return err; |
| 87 | } |
| 88 | |
| 89 | #ifdef CONFIG_MIPS64 |
| 90 | /* |
| 91 | * This is the o32 version |
| 92 | */ |
| 93 | |
| 94 | int fpu_emulator_save_context32(struct sigcontext32 *sc) |
| 95 | { |
| 96 | int i; |
| 97 | int err = 0; |
| 98 | |
| 99 | for (i = 0; i < 32; i+=2) { |
| 100 | err |= |
| 101 | __put_user(current->thread.fpu.soft.fpr[i], |
| 102 | &sc->sc_fpregs[i]); |
| 103 | } |
| 104 | err |= __put_user(current->thread.fpu.soft.fcr31, &sc->sc_fpc_csr); |
| 105 | err |= __put_user(fpuemuprivate.eir, &sc->sc_fpc_eir); |
| 106 | |
| 107 | return err; |
| 108 | } |
| 109 | |
| 110 | int fpu_emulator_restore_context32(struct sigcontext32 *sc) |
| 111 | { |
| 112 | int i; |
| 113 | int err = 0; |
| 114 | |
| 115 | for (i = 0; i < 32; i+=2) { |
| 116 | err |= |
| 117 | __get_user(current->thread.fpu.soft.fpr[i], |
| 118 | &sc->sc_fpregs[i]); |
| 119 | } |
| 120 | err |= __get_user(current->thread.fpu.soft.fcr31, &sc->sc_fpc_csr); |
| 121 | err |= __get_user(fpuemuprivate.eir, &sc->sc_fpc_eir); |
| 122 | |
| 123 | return err; |
| 124 | } |
| 125 | #endif |