Archipelago » qemu

/*

    NetWinder Floating Point Emulator

    (c) Rebel.COM, 1998,1999

    Direct questions, comments to Scott Bambrough <scottb@netwinder.org>

    This program is free software; you can redistribute it and/or modify

    it under the terms of the GNU General Public License as published by

    the Free Software Foundation; either version 2 of the License, or

    (at your option) any later version.

    This program is distributed in the hope that it will be useful,

    but WITHOUT ANY WARRANTY; without even the implied warranty of

    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License

    along with this program; if not, see <http://www.gnu.org/licenses/>.

*/

#ifndef __FPOPCODE_H__

#define __FPOPCODE_H__

/*

ARM Floating Point Instruction Classes

| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |

|c o n d|1 1 0 P|U|u|W|L|   Rn  |v|  Fd |0|0|0|1|  o f f s e t  | CPDT

|c o n d|1 1 0 P|U|w|W|L|   Rn  |x|  Fd |0|0|0|1|  o f f s e t  | CPDT

| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |

|c o n d|1 1 1 0|a|b|c|d|e|  Fn |j|  Fd |0|0|0|1|f|g|h|0|i|  Fm | CPDO

|c o n d|1 1 1 0|a|b|c|L|e|  Fn |   Rd  |0|0|0|1|f|g|h|1|i|  Fm | CPRT

|c o n d|1 1 1 0|a|b|c|1|e|  Fn |1|1|1|1|0|0|0|1|f|g|h|1|i|  Fm | comparisons

| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |

CPDT                data transfer instructions

                LDF, STF, LFM, SFM

CPDO                dyadic arithmetic instructions

                ADF, MUF, SUF, RSF, DVF, RDF,

                POW, RPW, RMF, FML, FDV, FRD, POL

CPDO                monadic arithmetic instructions

                MVF, MNF, ABS, RND, SQT, LOG, LGN, EXP,

                SIN, COS, TAN, ASN, ACS, ATN, URD, NRM

CPRT                joint arithmetic/data transfer instructions

                FIX (arithmetic followed by load/store)

                FLT (load/store followed by arithmetic)

                CMF, CNF CMFE, CNFE (comparisons)

                WFS, RFS (write/read floating point status register)

                WFC, RFC (write/read floating point control register)

cond                condition codes

P                pre/post index bit: 0 = postindex, 1 = preindex

U                up/down bit: 0 = stack grows down, 1 = stack grows up

W                write back bit: 1 = update base register (Rn)

L                load/store bit: 0 = store, 1 = load

Rn                base register

Rd                destination/source register

Fd                floating point destination register

Fn                floating point source register

Fm                floating point source register or floating point constant

uv                transfer length (TABLE 1)

wx                register count (TABLE 2)

abcd                arithmetic opcode (TABLES 3 & 4)

ef                destination size (rounding precision) (TABLE 5)

gh                rounding mode (TABLE 6)

j                dyadic/monadic bit: 0 = dyadic, 1 = monadic

i                 constant bit: 1 = constant (TABLE 6)

*/

/*

TABLE 1

+-------------------------+---+---+---------+---------+

|  Precision              | u | v | FPSR.EP | length  |

+-------------------------+---+---+---------+---------+

| Single                  | 0 ? 0 |    x    | 1 words |

| Double                  | 1 ? 1 |    x    | 2 words |

| Extended                | 1 ? 1 |    x    | 3 words |

| Packed decimal          | 1 ? 1 |    0    | 3 words |

| Expanded packed decimal | 1 ? 1 |    1    | 4 words |

+-------------------------+---+---+---------+---------+

Note: x = don't care

*/

/*

TABLE 2

+---+---+---------------------------------+

| w | x | Number of registers to transfer |

+---+---+---------------------------------+

| 0 ? 1 |  1                              |

| 1 ? 0 |  2                              |

| 1 ? 1 |  3                              |

| 0 ? 0 |  4                              |

+---+---+---------------------------------+

*/

/*

TABLE 3: Dyadic Floating Point Opcodes

+---+---+---+---+----------+-----------------------+-----------------------+

| a | b | c | d | Mnemonic | Description           | Operation             |

+---+---+---+---+----------+-----------------------+-----------------------+

| 0 | 0 | 0 | 0 | ADF      | Add                   | Fd := Fn + Fm         |

| 0 | 0 | 0 | 1 | MUF      | Multiply              | Fd := Fn * Fm         |

| 0 | 0 | 1 | 0 | SUF      | Subtract              | Fd := Fn - Fm         |

| 0 | 0 | 1 | 1 | RSF      | Reverse subtract      | Fd := Fm - Fn         |

| 0 | 1 | 0 | 0 | DVF      | Divide                | Fd := Fn / Fm         |

| 0 | 1 | 0 | 1 | RDF      | Reverse divide        | Fd := Fm / Fn         |

| 0 | 1 | 1 | 0 | POW      | Power                 | Fd := Fn ^ Fm         |

| 0 | 1 | 1 | 1 | RPW      | Reverse power         | Fd := Fm ^ Fn         |

| 1 | 0 | 0 | 0 | RMF      | Remainder             | Fd := IEEE rem(Fn/Fm) |

| 1 | 0 | 0 | 1 | FML      | Fast Multiply         | Fd := Fn * Fm         |

| 1 | 0 | 1 | 0 | FDV      | Fast Divide           | Fd := Fn / Fm         |

| 1 | 0 | 1 | 1 | FRD      | Fast reverse divide   | Fd := Fm / Fn         |

| 1 | 1 | 0 | 0 | POL      | Polar angle (ArcTan2) | Fd := arctan2(Fn,Fm)  |

| 1 | 1 | 0 | 1 |          | undefined instruction | trap                  |

| 1 | 1 | 1 | 0 |          | undefined instruction | trap                  |

| 1 | 1 | 1 | 1 |          | undefined instruction | trap                  |

+---+---+---+---+----------+-----------------------+-----------------------+

Note: POW, RPW, POL are deprecated, and are available for backwards

      compatibility only.

*/

/*

TABLE 4: Monadic Floating Point Opcodes

+---+---+---+---+----------+-----------------------+-----------------------+

| a | b | c | d | Mnemonic | Description           | Operation             |

+---+---+---+---+----------+-----------------------+-----------------------+

| 0 | 0 | 0 | 0 | MVF      | Move                  | Fd := Fm              |

| 0 | 0 | 0 | 1 | MNF      | Move negated          | Fd := - Fm            |

| 0 | 0 | 1 | 0 | ABS      | Absolute value        | Fd := abs(Fm)         |

| 0 | 0 | 1 | 1 | RND      | Round to integer      | Fd := int(Fm)         |

| 0 | 1 | 0 | 0 | SQT      | Square root           | Fd := sqrt(Fm)        |

| 0 | 1 | 0 | 1 | LOG      | Log base 10           | Fd := log10(Fm)       |

| 0 | 1 | 1 | 0 | LGN      | Log base e            | Fd := ln(Fm)          |

| 0 | 1 | 1 | 1 | EXP      | Exponent              | Fd := e ^ Fm          |

| 1 | 0 | 0 | 0 | SIN      | Sine                  | Fd := sin(Fm)         |

| 1 | 0 | 0 | 1 | COS      | Cosine                | Fd := cos(Fm)         |

| 1 | 0 | 1 | 0 | TAN      | Tangent               | Fd := tan(Fm)         |

| 1 | 0 | 1 | 1 | ASN      | Arc Sine              | Fd := arcsin(Fm)      |

| 1 | 1 | 0 | 0 | ACS      | Arc Cosine            | Fd := arccos(Fm)      |

| 1 | 1 | 0 | 1 | ATN      | Arc Tangent           | Fd := arctan(Fm)      |

| 1 | 1 | 1 | 0 | URD      | Unnormalized round    | Fd := int(Fm)         |

| 1 | 1 | 1 | 1 | NRM      | Normalize             | Fd := norm(Fm)        |

+---+---+---+---+----------+-----------------------+-----------------------+

Note: LOG, LGN, EXP, SIN, COS, TAN, ASN, ACS, ATN are deprecated, and are

      available for backwards compatibility only.

*/

/*

TABLE 5

+-------------------------+---+---+

|  Rounding Precision     | e | f |

+-------------------------+---+---+

| IEEE Single precision   | 0 ? 0 |

| IEEE Double precision   | 0 ? 1 |

| IEEE Extended precision | 1 ? 0 |

| undefined (trap)        | 1 ? 1 |

+-------------------------+---+---+

*/

/*

TABLE 5

+---------------------------------+---+---+

|  Rounding Mode                  | g | h |

+---------------------------------+---+---+

| Round to nearest (default)      | 0 ? 0 |

| Round toward plus infinity      | 0 ? 1 |

| Round toward negative infinity  | 1 ? 0 |

| Round toward zero               | 1 ? 1 |

+---------------------------------+---+---+

*/

/*

===

=== Definitions for load and store instructions

===

*/

/* bit masks */

#define BIT_PREINDEX        0x01000000

#define BIT_UP                0x00800000

#define BIT_WRITE_BACK        0x00200000

#define BIT_LOAD        0x00100000

/* masks for load/store */

#define MASK_CPDT                0x0c000000  /* data processing opcode */

#define MASK_OFFSET                0x000000ff

#define MASK_TRANSFER_LENGTH        0x00408000

#define MASK_REGISTER_COUNT        MASK_TRANSFER_LENGTH

#define MASK_COPROCESSOR        0x00000f00

/* Tests for transfer length */

#define TRANSFER_SINGLE                0x00000000

#define TRANSFER_DOUBLE                0x00008000

#define TRANSFER_EXTENDED        0x00400000

#define TRANSFER_PACKED                MASK_TRANSFER_LENGTH

/* Get the coprocessor number from the opcode. */

#define getCoprocessorNumber(opcode)        ((opcode & MASK_COPROCESSOR) >> 8)

/* Get the offset from the opcode. */

#define getOffset(opcode)                (opcode & MASK_OFFSET)

/* Tests for specific data transfer load/store opcodes. */

#define TEST_OPCODE(opcode,mask)        (((opcode) & (mask)) == (mask))

#define LOAD_OP(opcode)   TEST_OPCODE((opcode),MASK_CPDT | BIT_LOAD)

#define STORE_OP(opcode)  ((opcode & (MASK_CPDT | BIT_LOAD)) == MASK_CPDT)

#define LDF_OP(opcode)        (LOAD_OP(opcode) && (getCoprocessorNumber(opcode) == 1))

#define LFM_OP(opcode)        (LOAD_OP(opcode) && (getCoprocessorNumber(opcode) == 2))

#define STF_OP(opcode)        (STORE_OP(opcode) && (getCoprocessorNumber(opcode) == 1))

#define SFM_OP(opcode)        (STORE_OP(opcode) && (getCoprocessorNumber(opcode) == 2))

#define PREINDEXED(opcode)                ((opcode & BIT_PREINDEX) != 0)

#define POSTINDEXED(opcode)                ((opcode & BIT_PREINDEX) == 0)

#define BIT_UP_SET(opcode)                ((opcode & BIT_UP) != 0)

#define BIT_UP_CLEAR(opcode)                ((opcode & BIT_DOWN) == 0)

#define WRITE_BACK(opcode)                ((opcode & BIT_WRITE_BACK) != 0)

#define LOAD(opcode)                        ((opcode & BIT_LOAD) != 0)

#define STORE(opcode)                        ((opcode & BIT_LOAD) == 0)

/*

===

=== Definitions for arithmetic instructions

===

*/

/* bit masks */

#define BIT_MONADIC        0x00008000

#define BIT_CONSTANT        0x00000008

#define CONSTANT_FM(opcode)                ((opcode & BIT_CONSTANT) != 0)

#define MONADIC_INSTRUCTION(opcode)        ((opcode & BIT_MONADIC) != 0)

/* instruction identification masks */

#define MASK_CPDO                0x0e000000  /* arithmetic opcode */

#define MASK_ARITHMETIC_OPCODE        0x00f08000

#define MASK_DESTINATION_SIZE        0x00080080

/* dyadic arithmetic opcodes. */

#define ADF_CODE        0x00000000

#define MUF_CODE        0x00100000

#define SUF_CODE        0x00200000

#define RSF_CODE        0x00300000

#define DVF_CODE        0x00400000

#define RDF_CODE        0x00500000

#define POW_CODE        0x00600000

#define RPW_CODE        0x00700000

#define RMF_CODE        0x00800000

#define FML_CODE        0x00900000

#define FDV_CODE        0x00a00000

#define FRD_CODE        0x00b00000

#define POL_CODE        0x00c00000

/* 0x00d00000 is an invalid dyadic arithmetic opcode */

/* 0x00e00000 is an invalid dyadic arithmetic opcode */

/* 0x00f00000 is an invalid dyadic arithmetic opcode */

/* monadic arithmetic opcodes. */

#define MVF_CODE        0x00008000

#define MNF_CODE        0x00108000

#define ABS_CODE        0x00208000

#define RND_CODE        0x00308000

#define SQT_CODE        0x00408000

#define LOG_CODE        0x00508000

#define LGN_CODE        0x00608000

#define EXP_CODE        0x00708000

#define SIN_CODE        0x00808000

#define COS_CODE        0x00908000

#define TAN_CODE        0x00a08000

#define ASN_CODE        0x00b08000

#define ACS_CODE        0x00c08000

#define ATN_CODE        0x00d08000

#define URD_CODE        0x00e08000

#define NRM_CODE        0x00f08000

/*

===

=== Definitions for register transfer and comparison instructions

===

*/

#define MASK_CPRT                0x0e000010  /* register transfer opcode */

#define MASK_CPRT_CODE                0x00f00000

#define FLT_CODE                0x00000000

#define FIX_CODE                0x00100000

#define WFS_CODE                0x00200000

#define RFS_CODE                0x00300000

#define WFC_CODE                0x00400000

#define RFC_CODE                0x00500000

#define CMF_CODE                0x00900000

#define CNF_CODE                0x00b00000

#define CMFE_CODE                0x00d00000

#define CNFE_CODE                0x00f00000

/*

===

=== Common definitions

===

*/

/* register masks */

#define MASK_Rd                0x0000f000

#define MASK_Rn                0x000f0000

#define MASK_Fd                0x00007000

#define MASK_Fm                0x00000007

#define MASK_Fn                0x00070000

/* condition code masks */

#define CC_MASK                0xf0000000

#define CC_NEGATIVE        0x80000000

#define CC_ZERO                0x40000000

#define CC_CARRY        0x20000000

#define CC_OVERFLOW        0x10000000

#define CC_EQ                0x00000000

#define CC_NE                0x10000000

#define CC_CS                0x20000000

#define CC_HS                CC_CS

#define CC_CC                0x30000000

#define CC_LO                CC_CC

#define CC_MI                0x40000000

#define CC_PL                0x50000000

#define CC_VS                0x60000000

#define CC_VC                0x70000000

#define CC_HI                0x80000000

#define CC_LS                0x90000000

#define CC_GE                0xa0000000

#define CC_LT                0xb0000000

#define CC_GT                0xc0000000

#define CC_LE                0xd0000000

#define CC_AL                0xe0000000

#define CC_NV                0xf0000000

/* rounding masks/values */

#define MASK_ROUNDING_MODE        0x00000060

#define ROUND_TO_NEAREST        0x00000000

#define ROUND_TO_PLUS_INFINITY        0x00000020

#define ROUND_TO_MINUS_INFINITY        0x00000040

#define ROUND_TO_ZERO                0x00000060

#define MASK_ROUNDING_PRECISION        0x00080080

#define ROUND_SINGLE                0x00000000

#define ROUND_DOUBLE                0x00000080

#define ROUND_EXTENDED                0x00080000

/* Get the condition code from the opcode. */

#define getCondition(opcode)                (opcode >> 28)

/* Get the source register from the opcode. */

#define getRn(opcode)                        ((opcode & MASK_Rn) >> 16)

/* Get the destination floating point register from the opcode. */

#define getFd(opcode)                        ((opcode & MASK_Fd) >> 12)

/* Get the first source floating point register from the opcode. */

#define getFn(opcode)                ((opcode & MASK_Fn) >> 16)

/* Get the second source floating point register from the opcode. */

#define getFm(opcode)                (opcode & MASK_Fm)

/* Get the destination register from the opcode. */

#define getRd(opcode)                ((opcode & MASK_Rd) >> 12)

/* Get the rounding mode from the opcode. */

#define getRoundingMode(opcode)                ((opcode & MASK_ROUNDING_MODE) >> 5)

extern const floatx80 floatx80Constant[];

extern const float64 float64Constant[];

extern const float32 float32Constant[];

static inline floatx80 getExtendedConstant(const unsigned int nIndex)

{

   return floatx80Constant[nIndex];

}

static inline float64 getDoubleConstant(const unsigned int nIndex)

{

   return float64Constant[nIndex];

}

static inline float32 getSingleConstant(const unsigned int nIndex)

{

   return float32Constant[nIndex];

}

unsigned int getRegisterCount(const unsigned int opcode);

unsigned int getDestinationSize(const unsigned int opcode);

#endif