home
***
CD-ROM
|
disk
|
FTP
|
other
***
search
/
Sprite 1984 - 1993
/
Sprite 1984 - 1993.iso
/
src
/
machserver
/
1.098
/
mach
/
sun4c.md
/
fpu_simulator.h
< prev
next >
Wrap
C/C++ Source or Header
|
1989-08-17
|
5KB
|
190 lines
/* @(#)fpu_simulator.h 1.8 88/02/08 SMI */
/*
* Copyright (c) 1988 by Sun Microsystems, Inc.
*/
/*
* This whole file refuses to lint.
*/
#ifndef lint
/* Sparc floating-point simulator PUBLIC include file. */
#include <sun4/reg.h>
#include <sys/ieeefp.h>
/* PUBLIC TYPES */
enum fcc_type /* relationships */
{
fcc_equal = 0,
fcc_less = 1,
fcc_greater = 2,
fcc_unordered = 3
} ;
/* FSR types. */
enum ftt_type /* types of traps */
{
ftt_none = 0,
ftt_ieee = 1,
ftt_unfinished = 2,
ftt_unimplemented = 3,
ftt_sequence = 4,
ftt_alignment = 5, /* defined by software convention only */
ftt_fault = 6, /* defined by software convention only */
ftt_7 = 7
} ;
typedef /* Sparc FSR. */
struct
{
enum fp_direction_type rd : 2 ; /* rounding direction */
enum fp_precision_type rp : 2 ; /* rounding precision */
unsigned tem: 5 ; /* trap enable mask */
unsigned : 6 ;
enum ftt_type ftt : 3 ; /* FPU trap type */
unsigned qne : 1 ; /* FPQ not empty */
unsigned pr : 1 ; /* partial result */
enum fcc_type fcc : 2 ; /* FPU condition code */
unsigned aexc: 5 ; /* accumulated exception */
unsigned cexc: 5 ; /* current exception */
}
fsr_type ;
typedef /* FPU register viewed as single components. */
struct
{
unsigned sign : 1 ;
unsigned exponent : 8 ;
unsigned significand : 23 ;
}
single_type ;
typedef /* FPU register viewed as double components. */
struct
{
unsigned sign : 1 ;
unsigned exponent : 11 ;
unsigned significand : 20 ;
}
double_type ;
typedef /* FPU register viewed as extended components. */
struct
{
unsigned sign : 1 ;
unsigned exponent : 15 ;
unsigned unused : 16 ;
}
extended_type ;
typedef /* FPU register with multiple data views. */
union
{
int int_reg ;
long long_reg ;
unsigned unsigned_reg ;
float float_reg ;
single_type single_reg ;
double_type double_reg ;
extended_type extended_reg ;
}
freg_type ;
enum fp_op_type /* Type specifiers in FPU instructions. */
{
fp_op_integer = 0, /* Not in hardware, but convenient to define. */
fp_op_single = 1,
fp_op_double = 2,
fp_op_extended = 3
} ;
enum fp_opcode /* FPU op codes, minus precision and leading 0. */
{
fmovs = 0x0,
fnegs = 0x1,
fabss = 0x2,
fp_op_3 = 3, fp_op_4 = 4, fp_op_5 = 5, fp_op_6 = 6, fp_op_7 = 7,
fp_op_8 = 0x8,
fp_op_9 = 0x9,
fsqrt = 0xa,
fp_op_b = 0xb, fp_op_c = 0xc, fp_op_d = 0xd,
fp_op_e = 0xe, fp_op_f = 0xf,
fadd = 0x10,
fsub = 0x11,
fmul = 0x12,
fdiv = 0x13,
fcmp = 0x14,
fcmpe = 0x15,
fp_op_16 = 0x16, fp_op_17 = 0x17,
fp_op_18 = 0x18,
fp_op_19 = 0x19,
fp_op_20 = 0x20,
fp_op_21 = 0x21,
fp_op_22 = 0x22,
fp_op_23 = 0x23,
fp_op_24 = 0x24, fp_op_25 = 0x25, fp_op_26 = 0x26, fp_op_27 = 0x27,
fp_op_28 = 0x28, fp_op_29 = 0x29, fp_op_2a = 0x2a, fp_op_2b = 0x2b,
fp_op_2c = 0x2c, fp_op_2d = 0x2d, fp_op_2e = 0x2e, fp_op_2f = 0x2f,
fp_op_30 = 0x30,
ftos = 0x31,
ftod = 0x32,
ftox = 0x33,
ftoi = 0x34,
fp_op_35 = 0x35, fp_op_36 = 0x36, fp_op_37 = 0x37,
ft_op_38 = 0x38,
fp_op_39 = 0x39, fp_op_3a = 0x3a, fp_op_3b = 0x3b,
fp_op_3c = 0x3c,
fp_op_3d = 0x3d, fp_op_3e = 0x3e, fp_op_3f = 0x3f
} ;
typedef /* FPU instruction. */
struct
{
unsigned hibits : 2 ; /* Top two bits. */
unsigned rd : 5 ; /* Destination. */
unsigned op3 : 6 ; /* Main op code. */
unsigned rs1 : 5 ; /* First operand. */
unsigned ibit : 1 ; /* I format bit. */
enum fp_opcode opcode : 6 ; /* Floating-point op code. */
enum fp_op_type prec : 2 ; /* Precision. */
unsigned rs2 : 5 ; /* Second operand. */
}
fp_inst_type ;
/* PUBLIC FUNCTIONS */
extern enum ftt_type
fpu_simulator( /* pinst, pfsr */ ) ;
/* fp_inst_type *pinst; /* Pointer to FPU instruction to simulate. */
/* fsr_type *pfsr; /* Pointer to image of FSR to read and write. */
/*
* fpu_simulator simulates FPU instructions only; reads and writes FPU data
* registers directly.
*/
extern enum ftt_type
fp_emulator( /* pinst, pregs, pwindow, pfpu */ ) ;
/* fp_inst_type *pinst; /* Pointer to FPU instruction to simulate. */
/* struct regs *pregs; /* Pointer to PCB image of registers. */
/* struct window *pwindow;/* Pointer to locals and ins. */
/* struct fpu *pfpu; /* Pointer to FPU register block. */
/*
* fp_emulator simulates FPU and CPU-FPU instructions; reads and writes FPU
* data registers from image in pfpu.
*/
extern void
fp_traps( /*ftt, rp */) ;
/* enum ftt_type ftt; /* Type of trap. */
/* struct regs *rp; /* Pointer to PCB image of registers. */
/*
* fp_traps handles passing execption conditions to the kernel.
* It is called after fp_simulator or fp_emulator fail (return a non-zero ftt).
*/
#endif /* lint */