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.
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
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.
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.
20 * Kevin D. Kissell, kevink@mips.com and Carsten Langgaard, carstenl@mips.com
21 * Copyright (C) 2000 MIPS Technologies, Inc. All rights reserved.
23 #ifndef _ASM_FPU_EMULATOR_H
24 #define _ASM_FPU_EMULATOR_H
26 #include <linux/sched.h>
27 #include <asm/break.h>
28 #include <asm/thread_info.h>
30 #include <asm/local.h>
31 #include <asm/processor.h>
33 #ifdef CONFIG_DEBUG_FS
35 struct mips_fpu_emulator_stats
{
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
;
49 DECLARE_PER_CPU(struct mips_fpu_emulator_stats
, fpuemustats
);
51 #define MIPS_FPU_EMU_INC_STATS(M) \
54 __local_inc(&__get_cpu_var(fpuemustats).M); \
59 #define MIPS_FPU_EMU_INC_STATS(M) do { } while (0)
60 #endif /* CONFIG_DEBUG_FS */
62 extern int mips_dsemul(struct pt_regs
*regs
, mips_instruction ir
,
64 extern int do_dsemulret(struct pt_regs
*xcp
);
65 extern int fpu_emulator_cop1Handler(struct pt_regs
*xcp
,
66 struct mips_fpu_struct
*ctx
, int has_fpu
,
67 void *__user
*fault_addr
);
68 int process_fpemu_return(int sig
, void __user
*fault_addr
);
69 int mm_isBranchInstr(struct pt_regs
*regs
, struct mm_decoded_insn dec_insn
,
70 unsigned long *contpc
);
73 * Instruction inserted following the badinst to further tag the sequence
75 #define BD_COOKIE 0x0000bd36 /* tne $0, $0 with baggage */
78 * Break instruction with special math emu break code set
80 #define BREAK_MATH (0x0000000d | (BRK_MEMU << 16))
82 #define SIGNALLING_NAN 0x7ff800007ff80000LL
84 static inline void fpu_emulator_init_fpu(void)
86 struct task_struct
*t
= current
;
89 t
->thread
.fpu
.fcr31
= 0;
91 for (i
= 0; i
< 32; i
++)
92 set_fpr64(&t
->thread
.fpu
.fpr
[i
], 0, SIGNALLING_NAN
);
95 #endif /* _ASM_FPU_EMULATOR_H */