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Linux kernel mirror (for testing)
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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 local_t emulated;
37 local_t loads;
38 local_t stores;
39 local_t cp1ops;
40 local_t cp1xops;
41 local_t errors;
42 local_t ieee754_inexact;
43 local_t ieee754_underflow;
44 local_t ieee754_overflow;
45 local_t ieee754_zerodiv;
46 local_t ieee754_invalidop;
47};
48
49DECLARE_PER_CPU(struct mips_fpu_emulator_stats, fpuemustats);
50
51#define MIPS_FPU_EMU_INC_STATS(M) \
52do { \
53 preempt_disable(); \
54 __local_inc(&__get_cpu_var(fpuemustats).M); \
55 preempt_enable(); \
56} while (0)
57
58#else
59#define MIPS_FPU_EMU_INC_STATS(M) do { } while (0)
60#endif /* CONFIG_DEBUG_FS */
61
62extern int mips_dsemul(struct pt_regs *regs, mips_instruction ir,
63 unsigned long cpc);
64extern int do_dsemulret(struct pt_regs *xcp);
65extern int fpu_emulator_cop1Handler(struct pt_regs *xcp,
66 struct mips_fpu_struct *ctx, int has_fpu,
67 void *__user *fault_addr);
68int process_fpemu_return(int sig, void __user *fault_addr);
69int mm_isBranchInstr(struct pt_regs *regs, struct mm_decoded_insn dec_insn,
70 unsigned long *contpc);
71
72/*
73 * Instruction inserted following the badinst to further tag the sequence
74 */
75#define BD_COOKIE 0x0000bd36 /* tne $0, $0 with baggage */
76
77/*
78 * Break instruction with special math emu break code set
79 */
80#define BREAK_MATH (0x0000000d | (BRK_MEMU << 16))
81
82#define SIGNALLING_NAN 0x7ff800007ff80000LL
83
84static inline void fpu_emulator_init_fpu(void)
85{
86 struct task_struct *t = current;
87 int i;
88
89 t->thread.fpu.fcr31 = 0;
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 */