| /* | |
| * 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. | |
| * | |
| * Further private data for which no space exists in mips_fpu_struct. | |
| * This should be subsumed into the mips_fpu_struct structure as | |
| * defined in processor.h as soon as the absurd wired absolute assembler | |
| * offsets become dynamic at compile time. | |
| * | |
| * Kevin D. Kissell, kevink@mips.com and Carsten Langgaard, carstenl@mips.com | |
| * Copyright (C) 2000 MIPS Technologies, Inc. All rights reserved. | |
| */ | |
| #ifndef _ASM_FPU_EMULATOR_H | |
| #define _ASM_FPU_EMULATOR_H | |
| #include <linux/sched.h> | |
| #include <asm/dsemul.h> | |
| #include <asm/thread_info.h> | |
| #include <asm/inst.h> | |
| #include <asm/local.h> | |
| #include <asm/processor.h> | |
| #ifdef CONFIG_DEBUG_FS | |
| struct mips_fpu_emulator_stats { | |
| unsigned long emulated; | |
| unsigned long loads; | |
| unsigned long stores; | |
| unsigned long cp1ops; | |
| unsigned long cp1xops; | |
| unsigned long errors; | |
| unsigned long ieee754_inexact; | |
| unsigned long ieee754_underflow; | |
| unsigned long ieee754_overflow; | |
| unsigned long ieee754_zerodiv; | |
| unsigned long ieee754_invalidop; | |
| unsigned long ds_emul; | |
| }; | |
| DECLARE_PER_CPU(struct mips_fpu_emulator_stats, fpuemustats); | |
| #define MIPS_FPU_EMU_INC_STATS(M) \ | |
| do { \ | |
| preempt_disable(); \ | |
| __this_cpu_inc(fpuemustats.M); \ | |
| preempt_enable(); \ | |
| } while (0) | |
| #else | |
| #define MIPS_FPU_EMU_INC_STATS(M) do { } while (0) | |
| #endif /* CONFIG_DEBUG_FS */ | |
| extern int fpu_emulator_cop1Handler(struct pt_regs *xcp, | |
| struct mips_fpu_struct *ctx, int has_fpu, | |
| void *__user *fault_addr); | |
| void force_fcr31_sig(unsigned long fcr31, void __user *fault_addr, | |
| struct task_struct *tsk); | |
| int process_fpemu_return(int sig, void __user *fault_addr, | |
| unsigned long fcr31); | |
| int isBranchInstr(struct pt_regs *regs, struct mm_decoded_insn dec_insn, | |
| unsigned long *contpc); | |
| int mm_isBranchInstr(struct pt_regs *regs, struct mm_decoded_insn dec_insn, | |
| unsigned long *contpc); | |
| #define SIGNALLING_NAN 0x7ff800007ff80000LL | |
| static inline void fpu_emulator_init_fpu(void) | |
| { | |
| struct task_struct *t = current; | |
| int i; | |
| for (i = 0; i < 32; i++) | |
| set_fpr64(&t->thread.fpu.fpr[i], 0, SIGNALLING_NAN); | |
| } | |
| /* | |
| * Mask the FCSR Cause bits according to the Enable bits, observing | |
| * that Unimplemented is always enabled. | |
| */ | |
| static inline unsigned long mask_fcr31_x(unsigned long fcr31) | |
| { | |
| return fcr31 & (FPU_CSR_UNI_X | | |
| ((fcr31 & FPU_CSR_ALL_E) << | |
| (ffs(FPU_CSR_ALL_X) - ffs(FPU_CSR_ALL_E)))); | |
| } | |
| #endif /* _ASM_FPU_EMULATOR_H */ |