1/*
2 *  This program is free software; you can distribute it and/or modify it
3 *  under the terms of the GNU General Public License (Version 2) as
4 *  published by the Free Software Foundation.
5 *
6 *  This program is distributed in the hope it will be useful, but WITHOUT
7 *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
8 *  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
9 *  for more details.
10 *
11 *  You should have received a copy of the GNU General Public License along
12 *  with this program; if not, write to the Free Software Foundation, Inc.,
13 *  59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
14 *
15 * Further private data for which no space exists in mips_fpu_struct.
16 * This should be subsumed into the mips_fpu_struct structure as
17 * defined in processor.h as soon as the absurd wired absolute assembler
18 * offsets become dynamic at compile time.
19 *
20 * Kevin D. Kissell, kevink@mips.com and Carsten Langgaard, carstenl@mips.com
21 * Copyright (C) 2000 MIPS Technologies, Inc.  All rights reserved.
22 */
23#ifndef _ASM_FPU_EMULATOR_H
24#define _ASM_FPU_EMULATOR_H
25
26#include <linux/sched.h>
27#include <asm/break.h>
28#include <asm/thread_info.h>
29#include <asm/inst.h>
30#include <asm/local.h>
31#include <asm/processor.h>
32
33#ifdef CONFIG_DEBUG_FS
34
35struct mips_fpu_emulator_stats {
36	unsigned long emulated;
37	unsigned long loads;
38	unsigned long stores;
39	unsigned long cp1ops;
40	unsigned long cp1xops;
41	unsigned long errors;
42	unsigned long ieee754_inexact;
43	unsigned long ieee754_underflow;
44	unsigned long ieee754_overflow;
45	unsigned long ieee754_zerodiv;
46	unsigned long ieee754_invalidop;
47	unsigned long ds_emul;
48};
49
50DECLARE_PER_CPU(struct mips_fpu_emulator_stats, fpuemustats);
51
52#define MIPS_FPU_EMU_INC_STATS(M)					\
53do {									\
54	preempt_disable();						\
55	__this_cpu_inc(fpuemustats.M);					\
56	preempt_enable();						\
57} while (0)
58
59#else
60#define MIPS_FPU_EMU_INC_STATS(M) do { } while (0)
61#endif /* CONFIG_DEBUG_FS */
62
63extern int mips_dsemul(struct pt_regs *regs, mips_instruction ir,
64	unsigned long cpc);
65extern int do_dsemulret(struct pt_regs *xcp);
66extern int fpu_emulator_cop1Handler(struct pt_regs *xcp,
67				    struct mips_fpu_struct *ctx, int has_fpu,
68				    void *__user *fault_addr);
69int process_fpemu_return(int sig, void __user *fault_addr,
70			 unsigned long fcr31);
71int mm_isBranchInstr(struct pt_regs *regs, struct mm_decoded_insn dec_insn,
72		     unsigned long *contpc);
73
74/*
75 * Instruction inserted following the badinst to further tag the sequence
76 */
77#define BD_COOKIE 0x0000bd36	/* tne $0, $0 with baggage */
78
79/*
80 * Break instruction with special math emu break code set
81 */
82#define BREAK_MATH (0x0000000d | (BRK_MEMU << 16))
83
84#define SIGNALLING_NAN 0x7ff800007ff80000LL
85
86static inline void fpu_emulator_init_fpu(void)
87{
88	struct task_struct *t = current;
89	int i;
90
91	for (i = 0; i < 32; i++)
92		set_fpr64(&t->thread.fpu.fpr[i], 0, SIGNALLING_NAN);
93}
94
95#endif /* _ASM_FPU_EMULATOR_H */
96