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qemu/target/riscv/instmap.h
Alex Bennée 25139bf7f8 target/riscv: progressively load the instruction during decode 
The plugin system would throw up a harmless warning when it detected
that a disassembly of an instruction didn't use all it's bytes. Fix
the riscv decoder to only load the instruction bytes it needs as it
needs them.

This drops opcode from the ctx in favour if passing the appropriately
sized opcode down a few levels of the decode.

Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Reviewed-by: Robert Foley <robert.foley@linaro.org>

Message-Id: <20200225124710.14152-15-alex.bennee@linaro.org>
2020-02-25 20:20:23 +00:00

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/*
* RISC-V emulation for qemu: Instruction decode helpers
*
* Copyright (c) 2016-2017 Sagar Karandikar, sagark@eecs.berkeley.edu
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2 or later, as published by the Free Software Foundation.
*
* This program is distributed in the hope 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 TARGET_RISCV_INSTMAP_H
#define TARGET_RISCV_INSTMAP_H
#define MASK_OP_MAJOR(op) (op & 0x7F)
enum {
/* rv32i, rv64i, rv32m */
OPC_RISC_LUI = (0x37),
OPC_RISC_AUIPC = (0x17),
OPC_RISC_JAL = (0x6F),
OPC_RISC_JALR = (0x67),
OPC_RISC_BRANCH = (0x63),
OPC_RISC_LOAD = (0x03),
OPC_RISC_STORE = (0x23),
OPC_RISC_ARITH_IMM = (0x13),
OPC_RISC_ARITH = (0x33),
OPC_RISC_FENCE = (0x0F),
OPC_RISC_SYSTEM = (0x73),
/* rv64i, rv64m */
OPC_RISC_ARITH_IMM_W = (0x1B),
OPC_RISC_ARITH_W = (0x3B),
/* rv32a, rv64a */
OPC_RISC_ATOMIC = (0x2F),
/* floating point */
OPC_RISC_FP_LOAD = (0x7),
OPC_RISC_FP_STORE = (0x27),
OPC_RISC_FMADD = (0x43),
OPC_RISC_FMSUB = (0x47),
OPC_RISC_FNMSUB = (0x4B),
OPC_RISC_FNMADD = (0x4F),
OPC_RISC_FP_ARITH = (0x53),
};
#define MASK_OP_ARITH(op) (MASK_OP_MAJOR(op) | (op & ((0x7 << 12) | \
(0x7F << 25))))
enum {
OPC_RISC_ADD = OPC_RISC_ARITH | (0x0 << 12) | (0x00 << 25),
OPC_RISC_SUB = OPC_RISC_ARITH | (0x0 << 12) | (0x20 << 25),
OPC_RISC_SLL = OPC_RISC_ARITH | (0x1 << 12) | (0x00 << 25),
OPC_RISC_SLT = OPC_RISC_ARITH | (0x2 << 12) | (0x00 << 25),
OPC_RISC_SLTU = OPC_RISC_ARITH | (0x3 << 12) | (0x00 << 25),
OPC_RISC_XOR = OPC_RISC_ARITH | (0x4 << 12) | (0x00 << 25),
OPC_RISC_SRL = OPC_RISC_ARITH | (0x5 << 12) | (0x00 << 25),
OPC_RISC_SRA = OPC_RISC_ARITH | (0x5 << 12) | (0x20 << 25),
OPC_RISC_OR = OPC_RISC_ARITH | (0x6 << 12) | (0x00 << 25),
OPC_RISC_AND = OPC_RISC_ARITH | (0x7 << 12) | (0x00 << 25),
/* RV64M */
OPC_RISC_MUL = OPC_RISC_ARITH | (0x0 << 12) | (0x01 << 25),
OPC_RISC_MULH = OPC_RISC_ARITH | (0x1 << 12) | (0x01 << 25),
OPC_RISC_MULHSU = OPC_RISC_ARITH | (0x2 << 12) | (0x01 << 25),
OPC_RISC_MULHU = OPC_RISC_ARITH | (0x3 << 12) | (0x01 << 25),
OPC_RISC_DIV = OPC_RISC_ARITH | (0x4 << 12) | (0x01 << 25),
OPC_RISC_DIVU = OPC_RISC_ARITH | (0x5 << 12) | (0x01 << 25),
OPC_RISC_REM = OPC_RISC_ARITH | (0x6 << 12) | (0x01 << 25),
OPC_RISC_REMU = OPC_RISC_ARITH | (0x7 << 12) | (0x01 << 25),
};
#define MASK_OP_ARITH_IMM(op) (MASK_OP_MAJOR(op) | (op & (0x7 << 12)))
enum {
OPC_RISC_ADDI = OPC_RISC_ARITH_IMM | (0x0 << 12),
OPC_RISC_SLTI = OPC_RISC_ARITH_IMM | (0x2 << 12),
OPC_RISC_SLTIU = OPC_RISC_ARITH_IMM | (0x3 << 12),
OPC_RISC_XORI = OPC_RISC_ARITH_IMM | (0x4 << 12),
OPC_RISC_ORI = OPC_RISC_ARITH_IMM | (0x6 << 12),
OPC_RISC_ANDI = OPC_RISC_ARITH_IMM | (0x7 << 12),
OPC_RISC_SLLI = OPC_RISC_ARITH_IMM | (0x1 << 12), /* additional part of
IMM */
OPC_RISC_SHIFT_RIGHT_I = OPC_RISC_ARITH_IMM | (0x5 << 12) /* SRAI, SRLI */
};
#define MASK_OP_BRANCH(op) (MASK_OP_MAJOR(op) | (op & (0x7 << 12)))
enum {
OPC_RISC_BEQ = OPC_RISC_BRANCH | (0x0 << 12),
OPC_RISC_BNE = OPC_RISC_BRANCH | (0x1 << 12),
OPC_RISC_BLT = OPC_RISC_BRANCH | (0x4 << 12),
OPC_RISC_BGE = OPC_RISC_BRANCH | (0x5 << 12),
OPC_RISC_BLTU = OPC_RISC_BRANCH | (0x6 << 12),
OPC_RISC_BGEU = OPC_RISC_BRANCH | (0x7 << 12)
};
enum {
OPC_RISC_ADDIW = OPC_RISC_ARITH_IMM_W | (0x0 << 12),
OPC_RISC_SLLIW = OPC_RISC_ARITH_IMM_W | (0x1 << 12), /* additional part of
IMM */
OPC_RISC_SHIFT_RIGHT_IW = OPC_RISC_ARITH_IMM_W | (0x5 << 12) /* SRAI, SRLI
*/
};
enum {
OPC_RISC_ADDW = OPC_RISC_ARITH_W | (0x0 << 12) | (0x00 << 25),
OPC_RISC_SUBW = OPC_RISC_ARITH_W | (0x0 << 12) | (0x20 << 25),
OPC_RISC_SLLW = OPC_RISC_ARITH_W | (0x1 << 12) | (0x00 << 25),
OPC_RISC_SRLW = OPC_RISC_ARITH_W | (0x5 << 12) | (0x00 << 25),
OPC_RISC_SRAW = OPC_RISC_ARITH_W | (0x5 << 12) | (0x20 << 25),
/* RV64M */
OPC_RISC_MULW = OPC_RISC_ARITH_W | (0x0 << 12) | (0x01 << 25),
OPC_RISC_DIVW = OPC_RISC_ARITH_W | (0x4 << 12) | (0x01 << 25),
OPC_RISC_DIVUW = OPC_RISC_ARITH_W | (0x5 << 12) | (0x01 << 25),
OPC_RISC_REMW = OPC_RISC_ARITH_W | (0x6 << 12) | (0x01 << 25),
OPC_RISC_REMUW = OPC_RISC_ARITH_W | (0x7 << 12) | (0x01 << 25),
};
#define MASK_OP_LOAD(op) (MASK_OP_MAJOR(op) | (op & (0x7 << 12)))
enum {
OPC_RISC_LB = OPC_RISC_LOAD | (0x0 << 12),
OPC_RISC_LH = OPC_RISC_LOAD | (0x1 << 12),
OPC_RISC_LW = OPC_RISC_LOAD | (0x2 << 12),
OPC_RISC_LD = OPC_RISC_LOAD | (0x3 << 12),
OPC_RISC_LBU = OPC_RISC_LOAD | (0x4 << 12),
OPC_RISC_LHU = OPC_RISC_LOAD | (0x5 << 12),
OPC_RISC_LWU = OPC_RISC_LOAD | (0x6 << 12),
};
#define MASK_OP_STORE(op) (MASK_OP_MAJOR(op) | (op & (0x7 << 12)))
enum {
OPC_RISC_SB = OPC_RISC_STORE | (0x0 << 12),
OPC_RISC_SH = OPC_RISC_STORE | (0x1 << 12),
OPC_RISC_SW = OPC_RISC_STORE | (0x2 << 12),
OPC_RISC_SD = OPC_RISC_STORE | (0x3 << 12),
};
#define MASK_OP_JALR(op) (MASK_OP_MAJOR(op) | (op & (0x7 << 12)))
/* no enum since OPC_RISC_JALR is the actual value */
#define MASK_OP_ATOMIC(op) \
(MASK_OP_MAJOR(op) | (op & ((0x7 << 12) | (0x7F << 25))))
#define MASK_OP_ATOMIC_NO_AQ_RL_SZ(op) \
(MASK_OP_MAJOR(op) | (op & (0x1F << 27)))
enum {
OPC_RISC_LR = OPC_RISC_ATOMIC | (0x02 << 27),
OPC_RISC_SC = OPC_RISC_ATOMIC | (0x03 << 27),
OPC_RISC_AMOSWAP = OPC_RISC_ATOMIC | (0x01 << 27),
OPC_RISC_AMOADD = OPC_RISC_ATOMIC | (0x00 << 27),
OPC_RISC_AMOXOR = OPC_RISC_ATOMIC | (0x04 << 27),
OPC_RISC_AMOAND = OPC_RISC_ATOMIC | (0x0C << 27),
OPC_RISC_AMOOR = OPC_RISC_ATOMIC | (0x08 << 27),
OPC_RISC_AMOMIN = OPC_RISC_ATOMIC | (0x10 << 27),
OPC_RISC_AMOMAX = OPC_RISC_ATOMIC | (0x14 << 27),
OPC_RISC_AMOMINU = OPC_RISC_ATOMIC | (0x18 << 27),
OPC_RISC_AMOMAXU = OPC_RISC_ATOMIC | (0x1C << 27),
};
#define MASK_OP_SYSTEM(op) (MASK_OP_MAJOR(op) | (op & (0x7 << 12)))
enum {
OPC_RISC_ECALL = OPC_RISC_SYSTEM | (0x0 << 12),
OPC_RISC_EBREAK = OPC_RISC_SYSTEM | (0x0 << 12),
OPC_RISC_ERET = OPC_RISC_SYSTEM | (0x0 << 12),
OPC_RISC_MRTS = OPC_RISC_SYSTEM | (0x0 << 12),
OPC_RISC_MRTH = OPC_RISC_SYSTEM | (0x0 << 12),
OPC_RISC_HRTS = OPC_RISC_SYSTEM | (0x0 << 12),
OPC_RISC_WFI = OPC_RISC_SYSTEM | (0x0 << 12),
OPC_RISC_SFENCEVM = OPC_RISC_SYSTEM | (0x0 << 12),
OPC_RISC_CSRRW = OPC_RISC_SYSTEM | (0x1 << 12),
OPC_RISC_CSRRS = OPC_RISC_SYSTEM | (0x2 << 12),
OPC_RISC_CSRRC = OPC_RISC_SYSTEM | (0x3 << 12),
OPC_RISC_CSRRWI = OPC_RISC_SYSTEM | (0x5 << 12),
OPC_RISC_CSRRSI = OPC_RISC_SYSTEM | (0x6 << 12),
OPC_RISC_CSRRCI = OPC_RISC_SYSTEM | (0x7 << 12),
};
#define MASK_OP_FP_LOAD(op) (MASK_OP_MAJOR(op) | (op & (0x7 << 12)))
enum {
OPC_RISC_FLW = OPC_RISC_FP_LOAD | (0x2 << 12),
OPC_RISC_FLD = OPC_RISC_FP_LOAD | (0x3 << 12),
};
#define MASK_OP_FP_STORE(op) (MASK_OP_MAJOR(op) | (op & (0x7 << 12)))
enum {
OPC_RISC_FSW = OPC_RISC_FP_STORE | (0x2 << 12),
OPC_RISC_FSD = OPC_RISC_FP_STORE | (0x3 << 12),
};
#define MASK_OP_FP_FMADD(op) (MASK_OP_MAJOR(op) | (op & (0x3 << 25)))
enum {
OPC_RISC_FMADD_S = OPC_RISC_FMADD | (0x0 << 25),
OPC_RISC_FMADD_D = OPC_RISC_FMADD | (0x1 << 25),
};
#define MASK_OP_FP_FMSUB(op) (MASK_OP_MAJOR(op) | (op & (0x3 << 25)))
enum {
OPC_RISC_FMSUB_S = OPC_RISC_FMSUB | (0x0 << 25),
OPC_RISC_FMSUB_D = OPC_RISC_FMSUB | (0x1 << 25),
};
#define MASK_OP_FP_FNMADD(op) (MASK_OP_MAJOR(op) | (op & (0x3 << 25)))
enum {
OPC_RISC_FNMADD_S = OPC_RISC_FNMADD | (0x0 << 25),
OPC_RISC_FNMADD_D = OPC_RISC_FNMADD | (0x1 << 25),
};
#define MASK_OP_FP_FNMSUB(op) (MASK_OP_MAJOR(op) | (op & (0x3 << 25)))
enum {
OPC_RISC_FNMSUB_S = OPC_RISC_FNMSUB | (0x0 << 25),
OPC_RISC_FNMSUB_D = OPC_RISC_FNMSUB | (0x1 << 25),
};
#define MASK_OP_FP_ARITH(op) (MASK_OP_MAJOR(op) | (op & (0x7F << 25)))
enum {
/* float */
OPC_RISC_FADD_S = OPC_RISC_FP_ARITH | (0x0 << 25),
OPC_RISC_FSUB_S = OPC_RISC_FP_ARITH | (0x4 << 25),
OPC_RISC_FMUL_S = OPC_RISC_FP_ARITH | (0x8 << 25),
OPC_RISC_FDIV_S = OPC_RISC_FP_ARITH | (0xC << 25),
OPC_RISC_FSGNJ_S = OPC_RISC_FP_ARITH | (0x10 << 25),
OPC_RISC_FSGNJN_S = OPC_RISC_FP_ARITH | (0x10 << 25),
OPC_RISC_FSGNJX_S = OPC_RISC_FP_ARITH | (0x10 << 25),
OPC_RISC_FMIN_S = OPC_RISC_FP_ARITH | (0x14 << 25),
OPC_RISC_FMAX_S = OPC_RISC_FP_ARITH | (0x14 << 25),
OPC_RISC_FSQRT_S = OPC_RISC_FP_ARITH | (0x2C << 25),
OPC_RISC_FEQ_S = OPC_RISC_FP_ARITH | (0x50 << 25),
OPC_RISC_FLT_S = OPC_RISC_FP_ARITH | (0x50 << 25),
OPC_RISC_FLE_S = OPC_RISC_FP_ARITH | (0x50 << 25),
OPC_RISC_FCVT_W_S = OPC_RISC_FP_ARITH | (0x60 << 25),
OPC_RISC_FCVT_WU_S = OPC_RISC_FP_ARITH | (0x60 << 25),
OPC_RISC_FCVT_L_S = OPC_RISC_FP_ARITH | (0x60 << 25),
OPC_RISC_FCVT_LU_S = OPC_RISC_FP_ARITH | (0x60 << 25),
OPC_RISC_FCVT_S_W = OPC_RISC_FP_ARITH | (0x68 << 25),
OPC_RISC_FCVT_S_WU = OPC_RISC_FP_ARITH | (0x68 << 25),
OPC_RISC_FCVT_S_L = OPC_RISC_FP_ARITH | (0x68 << 25),
OPC_RISC_FCVT_S_LU = OPC_RISC_FP_ARITH | (0x68 << 25),
OPC_RISC_FMV_X_S = OPC_RISC_FP_ARITH | (0x70 << 25),
OPC_RISC_FCLASS_S = OPC_RISC_FP_ARITH | (0x70 << 25),
OPC_RISC_FMV_S_X = OPC_RISC_FP_ARITH | (0x78 << 25),
/* double */
OPC_RISC_FADD_D = OPC_RISC_FP_ARITH | (0x1 << 25),
OPC_RISC_FSUB_D = OPC_RISC_FP_ARITH | (0x5 << 25),
OPC_RISC_FMUL_D = OPC_RISC_FP_ARITH | (0x9 << 25),
OPC_RISC_FDIV_D = OPC_RISC_FP_ARITH | (0xD << 25),
OPC_RISC_FSGNJ_D = OPC_RISC_FP_ARITH | (0x11 << 25),
OPC_RISC_FSGNJN_D = OPC_RISC_FP_ARITH | (0x11 << 25),
OPC_RISC_FSGNJX_D = OPC_RISC_FP_ARITH | (0x11 << 25),
OPC_RISC_FMIN_D = OPC_RISC_FP_ARITH | (0x15 << 25),
OPC_RISC_FMAX_D = OPC_RISC_FP_ARITH | (0x15 << 25),
OPC_RISC_FCVT_S_D = OPC_RISC_FP_ARITH | (0x20 << 25),
OPC_RISC_FCVT_D_S = OPC_RISC_FP_ARITH | (0x21 << 25),
OPC_RISC_FSQRT_D = OPC_RISC_FP_ARITH | (0x2D << 25),
OPC_RISC_FEQ_D = OPC_RISC_FP_ARITH | (0x51 << 25),
OPC_RISC_FLT_D = OPC_RISC_FP_ARITH | (0x51 << 25),
OPC_RISC_FLE_D = OPC_RISC_FP_ARITH | (0x51 << 25),
OPC_RISC_FCVT_W_D = OPC_RISC_FP_ARITH | (0x61 << 25),
OPC_RISC_FCVT_WU_D = OPC_RISC_FP_ARITH | (0x61 << 25),
OPC_RISC_FCVT_L_D = OPC_RISC_FP_ARITH | (0x61 << 25),
OPC_RISC_FCVT_LU_D = OPC_RISC_FP_ARITH | (0x61 << 25),
OPC_RISC_FCVT_D_W = OPC_RISC_FP_ARITH | (0x69 << 25),
OPC_RISC_FCVT_D_WU = OPC_RISC_FP_ARITH | (0x69 << 25),
OPC_RISC_FCVT_D_L = OPC_RISC_FP_ARITH | (0x69 << 25),
OPC_RISC_FCVT_D_LU = OPC_RISC_FP_ARITH | (0x69 << 25),
OPC_RISC_FMV_X_D = OPC_RISC_FP_ARITH | (0x71 << 25),
OPC_RISC_FCLASS_D = OPC_RISC_FP_ARITH | (0x71 << 25),
OPC_RISC_FMV_D_X = OPC_RISC_FP_ARITH | (0x79 << 25),
};
#define GET_B_IMM(inst) ((extract32(inst, 8, 4) << 1) \
| (extract32(inst, 25, 6) << 5) \
| (extract32(inst, 7, 1) << 11) \
| (sextract64(inst, 31, 1) << 12))
#define GET_STORE_IMM(inst) ((extract32(inst, 7, 5)) \
| (sextract64(inst, 25, 7) << 5))
#define GET_JAL_IMM(inst) ((extract32(inst, 21, 10) << 1) \
| (extract32(inst, 20, 1) << 11) \
| (extract32(inst, 12, 8) << 12) \
| (sextract64(inst, 31, 1) << 20))
#define GET_RM(inst) extract32(inst, 12, 3)
#define GET_RS3(inst) extract32(inst, 27, 5)
#define GET_RS1(inst) extract32(inst, 15, 5)
#define GET_RS2(inst) extract32(inst, 20, 5)
#define GET_RD(inst) extract32(inst, 7, 5)
#define GET_IMM(inst) sextract64(inst, 20, 12)
/* RVC decoding macros */
#define GET_C_IMM(inst) (extract32(inst, 2, 5) \
| (sextract64(inst, 12, 1) << 5))
#define GET_C_ZIMM(inst) (extract32(inst, 2, 5) \
| (extract32(inst, 12, 1) << 5))
#define GET_C_ADDI4SPN_IMM(inst) ((extract32(inst, 6, 1) << 2) \
| (extract32(inst, 5, 1) << 3) \
| (extract32(inst, 11, 2) << 4) \
| (extract32(inst, 7, 4) << 6))
#define GET_C_ADDI16SP_IMM(inst) ((extract32(inst, 6, 1) << 4) \
| (extract32(inst, 2, 1) << 5) \
| (extract32(inst, 5, 1) << 6) \
| (extract32(inst, 3, 2) << 7) \
| (sextract64(inst, 12, 1) << 9))
#define GET_C_LWSP_IMM(inst) ((extract32(inst, 4, 3) << 2) \
| (extract32(inst, 12, 1) << 5) \
| (extract32(inst, 2, 2) << 6))
#define GET_C_LDSP_IMM(inst) ((extract32(inst, 5, 2) << 3) \
| (extract32(inst, 12, 1) << 5) \
| (extract32(inst, 2, 3) << 6))
#define GET_C_SWSP_IMM(inst) ((extract32(inst, 9, 4) << 2) \
| (extract32(inst, 7, 2) << 6))
#define GET_C_SDSP_IMM(inst) ((extract32(inst, 10, 3) << 3) \
| (extract32(inst, 7, 3) << 6))
#define GET_C_LW_IMM(inst) ((extract32(inst, 6, 1) << 2) \
| (extract32(inst, 10, 3) << 3) \
| (extract32(inst, 5, 1) << 6))
#define GET_C_LD_IMM(inst) ((extract16(inst, 10, 3) << 3) \
| (extract16(inst, 5, 2) << 6))
#define GET_C_J_IMM(inst) ((extract32(inst, 3, 3) << 1) \
| (extract32(inst, 11, 1) << 4) \
| (extract32(inst, 2, 1) << 5) \
| (extract32(inst, 7, 1) << 6) \
| (extract32(inst, 6, 1) << 7) \
| (extract32(inst, 9, 2) << 8) \
| (extract32(inst, 8, 1) << 10) \
| (sextract64(inst, 12, 1) << 11))
#define GET_C_B_IMM(inst) ((extract32(inst, 3, 2) << 1) \
| (extract32(inst, 10, 2) << 3) \
| (extract32(inst, 2, 1) << 5) \
| (extract32(inst, 5, 2) << 6) \
| (sextract64(inst, 12, 1) << 8))
#define GET_C_SIMM3(inst) extract32(inst, 10, 3)
#define GET_C_RD(inst) GET_RD(inst)
#define GET_C_RS1(inst) GET_RD(inst)
#define GET_C_RS2(inst) extract32(inst, 2, 5)
#define GET_C_RS1S(inst) (8 + extract16(inst, 7, 3))
#define GET_C_RS2S(inst) (8 + extract16(inst, 2, 3))
#endif
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