1 /*
2 NetWinder Floating Point Emulator
3 (c) Rebel.com, 1998-1999
4
5 Direct questions, comments to Scott Bambrough <scottb@netwinder.org>
6
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.
11
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.
16
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, see <http://www.gnu.org/licenses/>.
19 */
20
21 #ifndef FPA11_H
22 #define FPA11_H
23
24 #include "cpu.h"
25
26 #define GET_FPA11() (qemufpa)
27
28 /*
29 * The processes registers are always at the very top of the 8K
30 * stack+task struct. Use the same method as 'current' uses to
31 * reach them.
32 */
33 extern CPUARMState *user_registers;
34
35 #define GET_USERREG() (user_registers)
36
37 /* Need task_struct */
38 //#include <linux/sched.h>
39
40 /* includes */
41 #include "fpsr.h" /* FP control and status register definitions */
42 #include "fpu/softfloat.h"
43
44 #define typeNone 0x00
45 #define typeSingle 0x01
46 #define typeDouble 0x02
47 #define typeExtended 0x03
48
49 /*
50 * This must be no more and no less than 12 bytes.
51 */
52 typedef union tagFPREG {
53 floatx80 fExtended;
54 float64 fDouble;
55 float32 fSingle;
56 } FPREG;
57
58 /*
59 * FPA11 device model.
60 *
61 * This structure is exported to user space. Do not re-order.
62 * Only add new stuff to the end, and do not change the size of
63 * any element. Elements of this structure are used by user
64 * space, and must match struct user_fp in include/asm-arm/user.h.
65 * We include the byte offsets below for documentation purposes.
66 *
67 * The size of this structure and FPREG are checked by fpmodule.c
68 * on initialisation. If the rules have been broken, NWFPE will
69 * not initialise.
70 */
71 typedef struct tagFPA11 {
72 /* 0 */ FPREG fpreg[8]; /* 8 floating point registers */
73 /* 96 */ FPSR fpsr; /* floating point status register */
74 /* 100 */ FPCR fpcr; /* floating point control register */
75 /* 104 */ unsigned char fType[8]; /* type of floating point value held in
76 floating point registers. One of none
77 single, double or extended. */
78 /* 112 */ int initflag; /* this is special. The kernel guarantees
79 to set it to 0 when a thread is launched,
80 so we can use it to detect whether this
81 instance of the emulator needs to be
82 initialised. */
83 float_status fp_status; /* QEMU float emulator status */
84 } FPA11;
85
86 extern FPA11* qemufpa;
87
88 void resetFPA11(void);
89 void SetRoundingMode(const unsigned int);
90 void SetRoundingPrecision(const unsigned int);
91
readRegister(unsigned int reg)92 static inline unsigned int readRegister(unsigned int reg)
93 {
94 return (user_registers->regs[(reg)]);
95 }
96
writeRegister(unsigned int x,unsigned int y)97 static inline void writeRegister(unsigned int x, unsigned int y)
98 {
99 #if 0
100 printf("writing %d to r%d\n",y,x);
101 #endif
102 user_registers->regs[(x)]=(y);
103 }
104
writeConditionCodes(unsigned int x)105 static inline void writeConditionCodes(unsigned int x)
106 {
107 cpsr_write(user_registers, x, CPSR_NZCV, CPSRWriteByInstr);
108 }
109
110 #define ARM_REG_PC 15
111
112 unsigned int EmulateAll(unsigned int opcode, FPA11* qfpa, CPUARMState* qregs);
113
114 unsigned int EmulateCPDO(const unsigned int);
115 unsigned int EmulateCPDT(const unsigned int);
116 unsigned int EmulateCPRT(const unsigned int);
117
118 unsigned int SingleCPDO(const unsigned int opcode);
119 unsigned int DoubleCPDO(const unsigned int opcode);
120 unsigned int ExtendedCPDO(const unsigned int opcode);
121
122
123 /* included only for get_user/put_user macros */
124 #include "qemu.h"
125
126 #endif
127