2
NetWinder Floating Point Emulator
3
(c) Rebel.com, 1998-1999
5
Direct questions, comments to Scott Bambrough <scottb@netwinder.org>
7
This program is free software; you can redistribute it and/or modify
8
it under the terms of the GNU General Public License as published by
9
the Free Software Foundation; either version 2 of the License, or
10
(at your option) any later version.
12
This program is distributed in the hope that it will be useful,
13
but WITHOUT ANY WARRANTY; without even the implied warranty of
14
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15
GNU General Public License for more details.
17
You should have received a copy of the GNU General Public License
18
along with this program; if not, write to the Free Software
19
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
31
#define GET_FPA11() (qemufpa)
34
* The processes registers are always at the very top of the 8K
35
* stack+task struct. Use the same method as 'current' uses to
38
extern CPUARMState *user_registers;
40
#define GET_USERREG() (user_registers)
42
/* Need task_struct */
43
//#include <linux/sched.h>
46
#include "fpsr.h" /* FP control and status register definitions */
47
#include "softfloat.h"
50
#define typeSingle 0x01
51
#define typeDouble 0x02
52
#define typeExtended 0x03
55
* This must be no more and no less than 12 bytes.
57
typedef union tagFPREG {
66
* This structure is exported to user space. Do not re-order.
67
* Only add new stuff to the end, and do not change the size of
68
* any element. Elements of this structure are used by user
69
* space, and must match struct user_fp in include/asm-arm/user.h.
70
* We include the byte offsets below for documentation purposes.
72
* The size of this structure and FPREG are checked by fpmodule.c
73
* on initialisation. If the rules have been broken, NWFPE will
76
typedef struct tagFPA11 {
77
/* 0 */ FPREG fpreg[8]; /* 8 floating point registers */
78
/* 96 */ FPSR fpsr; /* floating point status register */
79
/* 100 */ FPCR fpcr; /* floating point control register */
80
/* 104 */ unsigned char fType[8]; /* type of floating point value held in
81
floating point registers. One of none
82
single, double or extended. */
83
/* 112 */ int initflag; /* this is special. The kernel guarantees
84
to set it to 0 when a thread is launched,
85
so we can use it to detect whether this
86
instance of the emulator needs to be
88
float_status fp_status; /* QEMU float emulator status */
91
extern FPA11* qemufpa;
93
extern void resetFPA11(void);
94
extern void SetRoundingMode(const unsigned int);
95
extern void SetRoundingPrecision(const unsigned int);
97
static inline unsigned int readRegister(unsigned int reg)
99
return (user_registers->regs[(reg)]);
102
static inline void writeRegister(unsigned int x, unsigned int y)
105
printf("writing %d to r%d\n",y,x);
107
user_registers->regs[(x)]=(y);
110
static inline void writeConditionCodes(unsigned int x)
112
cpsr_write(user_registers,x,CPSR_NZCV);
117
unsigned int EmulateAll(unsigned int opcode, FPA11* qfpa, CPUARMState* qregs);
119
/* included only for get_user/put_user macros */