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375 lines
9.5 KiB
C
375 lines
9.5 KiB
C
/* decode.h -- Prototypes for AArch64 simulator decoder functions.
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Copyright (C) 2015-2021 Free Software Foundation, Inc.
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Contributed by Red Hat.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#ifndef _DECODE_H
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#define _DECODE_H
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#include <sys/types.h>
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#include "cpustate.h"
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/* Codes used in conditional instructions
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These are passed to conditional operations to identify which
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condition to test for. */
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typedef enum CondCode
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{
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EQ = 0x0, /* meaning Z == 1 */
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NE = 0x1, /* meaning Z == 0 */
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HS = 0x2, /* meaning C == 1 */
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CS = HS,
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LO = 0x3, /* meaning C == 0 */
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CC = LO,
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MI = 0x4, /* meaning N == 1 */
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PL = 0x5, /* meaning N == 0 */
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VS = 0x6, /* meaning V == 1 */
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VC = 0x7, /* meaning V == 0 */
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HI = 0x8, /* meaning C == 1 && Z == 0 */
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LS = 0x9, /* meaning !(C == 1 && Z == 0) */
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GE = 0xa, /* meaning N == V */
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LT = 0xb, /* meaning N != V */
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GT = 0xc, /* meaning Z == 0 && N == V */
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LE = 0xd, /* meaning !(Z == 0 && N == V) */
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AL = 0xe, /* meaning ANY */
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NV = 0xf /* ditto */
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} CondCode;
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/* Certain addressing modes for load require pre or post writeback of
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the computed address to a base register. */
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typedef enum WriteBack
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{
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Post = 0,
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Pre = 1,
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NoWriteBack = -1
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} WriteBack;
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/* Certain addressing modes for load require an offset to
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be optionally scaled so the decode needs to pass that
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through to the execute routine. */
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typedef enum Scaling
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{
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Unscaled = 0,
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Scaled = 1,
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NoScaling = -1
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} Scaling;
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/* When we do have to scale we do so by shifting using
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log(bytes in data element - 1) as the shift count.
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so we don't have to scale offsets when loading
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bytes. */
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typedef enum ScaleShift
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{
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ScaleShift16 = 1,
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ScaleShift32 = 2,
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ScaleShift64 = 3,
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ScaleShift128 = 4
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} ScaleShift;
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/* One of the addressing modes for load requires a 32-bit register
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value to be either zero- or sign-extended for these instructions
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UXTW or SXTW should be passed.
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Arithmetic register data processing operations can optionally
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extend a portion of the second register value for these
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instructions the value supplied must identify the portion of the
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register which is to be zero- or sign-exended. */
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typedef enum Extension
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{
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UXTB = 0,
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UXTH = 1,
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UXTW = 2,
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UXTX = 3,
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SXTB = 4,
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SXTH = 5,
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SXTW = 6,
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SXTX = 7,
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NoExtension = -1
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} Extension;
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/* Arithmetic and logical register data processing operations
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optionally perform a shift on the second register value. */
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typedef enum Shift
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{
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LSL = 0,
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LSR = 1,
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ASR = 2,
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ROR = 3
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} Shift;
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/* Bit twiddling helpers for instruction decode. */
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/* 32 bit mask with bits [hi,...,lo] set. */
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static inline uint32_t
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mask32 (int hi, int lo)
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{
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int nbits = (hi + 1) - lo;
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return ((1 << nbits) - 1) << lo;
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}
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/* 64 bit mask with bits [hi,...,lo] set. */
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static inline uint64_t
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mask64 (int hi, int lo)
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{
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int nbits = (hi + 1) - lo;
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return ((1L << nbits) - 1) << lo;
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}
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/* Pick bits [hi,...,lo] from val. */
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static inline uint32_t
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pick32 (uint32_t val, int hi, int lo)
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{
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return val & mask32 (hi, lo);
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}
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/* Pick bits [hi,...,lo] from val. */
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static inline uint64_t
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pick64 (uint64_t val, int hi, int lo)
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{
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return val & mask64 (hi, lo);
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}
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/* Pick bits [hi,...,lo] from val and shift to [(hi-(newlo - lo)),newlo]. */
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static inline uint32_t
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pickshift32 (uint32_t val, int hi, int lo, int newlo)
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{
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uint32_t bits = pick32 (val, hi, lo);
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if (lo < newlo)
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return bits << (newlo - lo);
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return bits >> (lo - newlo);
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}
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/* Mask [hi,lo] and shift down to start at bit 0. */
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static inline uint32_t
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pickbits32 (uint32_t val, int hi, int lo)
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{
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return pick32 (val, hi, lo) >> lo;
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}
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/* Mask [hi,lo] and shift down to start at bit 0. */
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static inline uint64_t
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pickbits64 (uint64_t val, int hi, int lo)
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{
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return pick64 (val, hi, lo) >> lo;
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}
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static inline uint32_t
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uimm (uint32_t val, int hi, int lo)
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{
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return pickbits32 (val, hi, lo);
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}
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static inline int32_t
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simm32 (uint32_t val, int hi, int lo)
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{
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union
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{
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uint32_t u;
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int32_t n;
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} x;
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x.u = val << (31 - hi);
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return x.n >> (31 - hi + lo);
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}
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static inline int64_t
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simm64 (uint64_t val, int hi, int lo)
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{
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union
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{
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uint64_t u;
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int64_t n;
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} x;
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x.u = val << (63 - hi);
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return x.n >> (63 - hi + lo);
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}
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/* Operation decode.
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Bits [28,24] are the primary dispatch vector. */
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static inline uint32_t
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dispatchGroup (uint32_t val)
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{
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return pickshift32 (val, 28, 25, 0);
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}
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/* The 16 possible values for bits [28,25] identified by tags which
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map them to the 5 main instruction groups LDST, DPREG, ADVSIMD,
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BREXSYS and DPIMM.
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An extra group PSEUDO is included in one of the unallocated ranges
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for simulator-specific pseudo-instructions. */
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enum DispatchGroup
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{
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GROUP_PSEUDO_0000,
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GROUP_UNALLOC_0001,
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GROUP_UNALLOC_0010,
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GROUP_UNALLOC_0011,
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GROUP_LDST_0100,
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GROUP_DPREG_0101,
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GROUP_LDST_0110,
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GROUP_ADVSIMD_0111,
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GROUP_DPIMM_1000,
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GROUP_DPIMM_1001,
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GROUP_BREXSYS_1010,
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GROUP_BREXSYS_1011,
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GROUP_LDST_1100,
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GROUP_DPREG_1101,
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GROUP_LDST_1110,
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GROUP_ADVSIMD_1111
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};
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/* Bits [31, 29] of a Pseudo are the secondary dispatch vector. */
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static inline uint32_t
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dispatchPseudo (uint32_t val)
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{
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return pickshift32 (val, 31, 29, 0);
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}
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/* The 8 possible values for bits [31,29] in a Pseudo Instruction.
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Bits [28,25] are always 0000. */
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enum DispatchPseudo
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{
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PSEUDO_UNALLOC_000, /* Unallocated. */
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PSEUDO_UNALLOC_001, /* Ditto. */
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PSEUDO_UNALLOC_010, /* Ditto. */
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PSEUDO_UNALLOC_011, /* Ditto. */
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PSEUDO_UNALLOC_100, /* Ditto. */
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PSEUDO_UNALLOC_101, /* Ditto. */
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PSEUDO_CALLOUT_110, /* CALLOUT -- bits [24,0] identify call/ret sig. */
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PSEUDO_HALT_111 /* HALT -- bits [24, 0] identify halt code. */
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};
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/* Bits [25, 23] of a DPImm are the secondary dispatch vector. */
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static inline uint32_t
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dispatchDPImm (uint32_t instr)
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{
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return pickshift32 (instr, 25, 23, 0);
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}
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/* The 8 possible values for bits [25,23] in a Data Processing Immediate
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Instruction. Bits [28,25] are always 100_. */
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enum DispatchDPImm
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{
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DPIMM_PCADR_000, /* PC-rel-addressing. */
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DPIMM_PCADR_001, /* Ditto. */
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DPIMM_ADDSUB_010, /* Add/Subtract (immediate). */
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DPIMM_ADDSUB_011, /* Ditto. */
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DPIMM_LOG_100, /* Logical (immediate). */
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DPIMM_MOV_101, /* Move Wide (immediate). */
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DPIMM_BITF_110, /* Bitfield. */
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DPIMM_EXTR_111 /* Extract. */
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};
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/* Bits [29,28:26] of a LS are the secondary dispatch vector. */
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static inline uint32_t
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dispatchLS (uint32_t instr)
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{
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return ( pickshift32 (instr, 29, 28, 1)
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| pickshift32 (instr, 26, 26, 0));
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}
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/* The 8 possible values for bits [29,28:26] in a Load/Store
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Instruction. Bits [28,25] are always _1_0. */
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enum DispatchLS
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{
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LS_EXCL_000, /* Load/store exclusive (includes some unallocated). */
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LS_ADVSIMD_001, /* AdvSIMD load/store (various -- includes some unallocated). */
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LS_LIT_010, /* Load register literal (includes some unallocated). */
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LS_LIT_011, /* Ditto. */
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LS_PAIR_100, /* Load/store register pair (various). */
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LS_PAIR_101, /* Ditto. */
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LS_OTHER_110, /* Other load/store formats. */
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LS_OTHER_111 /* Ditto. */
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};
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/* Bits [28:24:21] of a DPReg are the secondary dispatch vector. */
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static inline uint32_t
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dispatchDPReg (uint32_t instr)
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{
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return ( pickshift32 (instr, 28, 28, 2)
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| pickshift32 (instr, 24, 24, 1)
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| pickshift32 (instr, 21, 21, 0));
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}
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/* The 8 possible values for bits [28:24:21] in a Data Processing
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Register Instruction. Bits [28,25] are always _101. */
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enum DispatchDPReg
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{
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DPREG_LOG_000, /* Logical (shifted register). */
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DPREG_LOG_001, /* Ditto. */
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DPREG_ADDSHF_010, /* Add/subtract (shifted register). */
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DPREG_ADDEXT_011, /* Add/subtract (extended register). */
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DPREG_ADDCOND_100, /* Add/subtract (with carry) AND
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Cond compare/select AND
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Data Processing (1/2 source). */
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DPREG_UNALLOC_101, /* Unallocated. */
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DPREG_3SRC_110, /* Data Processing (3 source). */
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DPREG_3SRC_111 /* Data Processing (3 source). */
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};
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/* bits [31,29] of a BrExSys are the secondary dispatch vector. */
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static inline uint32_t
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dispatchBrExSys (uint32_t instr)
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{
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return pickbits32 (instr, 31, 29);
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}
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/* The 8 possible values for bits [31,29] in a Branch/Exception/System
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Instruction. Bits [28,25] are always 101_. */
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enum DispatchBr
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{
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BR_IMM_000, /* Unconditional branch (immediate). */
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BR_IMMCMP_001, /* Compare & branch (immediate) AND
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Test & branch (immediate). */
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BR_IMMCOND_010, /* Conditional branch (immediate) AND Unallocated. */
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BR_UNALLOC_011, /* Unallocated. */
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BR_IMM_100, /* Unconditional branch (immediate). */
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BR_IMMCMP_101, /* Compare & branch (immediate) AND
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Test & branch (immediate). */
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BR_REG_110, /* Unconditional branch (register) AND System AND
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Excn gen AND Unallocated. */
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BR_UNALLOC_111 /* Unallocated. */
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};
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/* TODO still need to provide secondary decode and dispatch for
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AdvSIMD Insructions with instr[28,25] = 0111 or 1111. */
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#endif /* _DECODE_H */
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