diff options
Diffstat (limited to 'arch/arm/nwfpe/fpopcode.h')
| -rw-r--r-- | arch/arm/nwfpe/fpopcode.h | 469 |
1 files changed, 469 insertions, 0 deletions
diff --git a/arch/arm/nwfpe/fpopcode.h b/arch/arm/nwfpe/fpopcode.h new file mode 100644 index 000000000..5729f1e1b --- /dev/null +++ b/arch/arm/nwfpe/fpopcode.h @@ -0,0 +1,469 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +/* + NetWinder Floating Point Emulator + (c) Rebel.COM, 1998,1999 + (c) Philip Blundell, 2001 + + Direct questions, comments to Scott Bambrough <scottb@netwinder.org> + +*/ + +#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|1|0| o f f s e t | CPDT (copro 2) +| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | +|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 (copro 2), SFM (copro 2) + +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) + +#ifdef CONFIG_FPE_NWFPE_XP +static inline floatx80 __pure getExtendedConstant(const unsigned int nIndex) +{ + extern const floatx80 floatx80Constant[]; + return floatx80Constant[nIndex]; +} +#endif + +static inline float64 __pure getDoubleConstant(const unsigned int nIndex) +{ + extern const float64 float64Constant[]; + return float64Constant[nIndex]; +} + +static inline float32 __pure getSingleConstant(const unsigned int nIndex) +{ + extern const float32 float32Constant[]; + return float32Constant[nIndex]; +} + +static inline unsigned int getTransferLength(const unsigned int opcode) +{ + unsigned int nRc; + + switch (opcode & MASK_TRANSFER_LENGTH) { + case 0x00000000: + nRc = 1; + break; /* single precision */ + case 0x00008000: + nRc = 2; + break; /* double precision */ + case 0x00400000: + nRc = 3; + break; /* extended precision */ + default: + nRc = 0; + } + + return (nRc); +} + +static inline unsigned int getRegisterCount(const unsigned int opcode) +{ + unsigned int nRc; + + switch (opcode & MASK_REGISTER_COUNT) { + case 0x00000000: + nRc = 4; + break; + case 0x00008000: + nRc = 1; + break; + case 0x00400000: + nRc = 2; + break; + case 0x00408000: + nRc = 3; + break; + default: + nRc = 0; + } + + return (nRc); +} + +static inline unsigned int getRoundingPrecision(const unsigned int opcode) +{ + unsigned int nRc; + + switch (opcode & MASK_ROUNDING_PRECISION) { + case 0x00000000: + nRc = 1; + break; + case 0x00000080: + nRc = 2; + break; + case 0x00080000: + nRc = 3; + break; + default: + nRc = 0; + } + + return (nRc); +} + +static inline unsigned int getDestinationSize(const unsigned int opcode) +{ + unsigned int nRc; + + switch (opcode & MASK_DESTINATION_SIZE) { + case 0x00000000: + nRc = typeSingle; + break; + case 0x00000080: + nRc = typeDouble; + break; + case 0x00080000: + nRc = typeExtended; + break; + default: + nRc = typeNone; + } + + return (nRc); +} + +extern const float64 float64Constant[]; +extern const float32 float32Constant[]; + +#endif |