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