/
rvsim.c
1107 lines (1031 loc) · 31.7 KB
/
rvsim.c
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/*
* Copyright (c) 2021 Paul Kennedy
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*
* Source: https://github.com/pmkenned/rv_sim
*/
#include <assert.h>
#include <stdarg.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#define NELEM(X) sizeof(X) / sizeof(X[0])
#define MASK_LSB_W(X, LSB, W) (X >> LSB) & ((1 << W) - 1)
#define MASK_MSB_LSB(X, MSB, LSB) (X >> LSB) & ((1 << (MSB - LSB + 1)) - 1)
enum { MAX_STEPS = 100 }; // TODO: make this a command-line argument
#define EXT_M 0
#define EXT_F 0
#define EXT_D 0
#define EXT_C 1
#define OPCODE_LIST_RV32I \
X(0x0000007f, 0x00000037, FMT_U, MNEM_LUI, "lui") \
X(0x0000007f, 0x00000017, FMT_U, MNEM_AUIPC, "auipc") \
X(0x0000007f, 0x0000006f, FMT_J, MNEM_JAL, "jal") \
X(0x0000707f, 0x00000067, FMT_I, MNEM_JALR, "jalr") \
X(0x0000707f, 0x00000063, FMT_B, MNEM_BEQ, "beq") \
X(0x0000707f, 0x00001063, FMT_B, MNEM_BNE, "bne") \
X(0x0000707f, 0x00004063, FMT_B, MNEM_BLT, "blt") \
X(0x0000707f, 0x00005063, FMT_B, MNEM_BGE, "bge") \
X(0x0000707f, 0x00006063, FMT_B, MNEM_BLTU, "bltu") \
X(0x0000707f, 0x00007063, FMT_B, MNEM_BGEU, "bgeu") \
X(0x0000707f, 0x00000003, FMT_I, MNEM_LB, "lb") \
X(0x0000707f, 0x00001003, FMT_I, MNEM_LH, "lh") \
X(0x0000707f, 0x00002003, FMT_I, MNEM_LW, "lw") \
X(0x0000707f, 0x00004003, FMT_I, MNEM_LBU, "lbu") \
X(0x0000707f, 0x00005003, FMT_I, MNEM_LHU, "lhu") \
X(0x0000707f, 0x00000023, FMT_S, MNEM_SB, "sb") \
X(0x0000707f, 0x00001023, FMT_S, MNEM_SH, "sh") \
X(0x0000707f, 0x00002023, FMT_S, MNEM_SW, "sw") \
X(0x0000707f, 0x00000013, FMT_I, MNEM_ADDI, "addi") \
X(0x0000707f, 0x00002013, FMT_I, MNEM_SLTI, "slti") \
X(0x0000707f, 0x00003013, FMT_I, MNEM_SLTIU, "sltiu") \
X(0x0000707f, 0x00004013, FMT_I, MNEM_XORI, "xori") \
X(0x0000707f, 0x00006013, FMT_I, MNEM_ORI, "ori") \
X(0x0000707f, 0x00007013, FMT_I, MNEM_ANDI, "andi") \
X(0xfe00707f, 0x00001013, FMT_I, MNEM_SLLI, "slli") \
X(0xfe00707f, 0x00005013, FMT_I, MNEM_SRLI, "srli") \
X(0xfe00707f, 0x40005013, FMT_I, MNEM_SRAI, "srai") \
X(0xfe00707f, 0x00000033, FMT_R, MNEM_ADD, "add") \
X(0xfe00707f, 0x40000033, FMT_R, MNEM_SUB, "sub") \
X(0xfe00707f, 0x00001033, FMT_R, MNEM_SLL, "sll") \
X(0xfe00707f, 0x00002033, FMT_R, MNEM_SLT, "slt") \
X(0xfe00707f, 0x00003033, FMT_R, MNEM_SLTU, "sltu") \
X(0xfe00707f, 0x00004033, FMT_R, MNEM_XOR, "xor") \
X(0xfe00707f, 0x00005033, FMT_R, MNEM_SRL, "srl") \
X(0xfe00707f, 0x40005033, FMT_R, MNEM_SRA, "sra") \
X(0xfe00707f, 0x00006033, FMT_R, MNEM_OR, "or") \
X(0xfe00707f, 0x00007033, FMT_R, MNEM_AND, "and") \
X(0xf00fffff, 0x0000000f, FMT_I, MNEM_FENCE, "fence") \
X(0xffffffff, 0x0000100f, FMT_I, MNEM_FENCE_I, "fence.i") \
X(0xffffffff, 0x00000073, FMT_I, MNEM_ECALL, "ecall") \
X(0xffffffff, 0x00100073, FMT_I, MNEM_EBREAK, "ebreak") \
X(0x0000707f, 0x00001073, FMT_I, MNEM_CSRRW, "csrrw") \
X(0x0000707f, 0x00002073, FMT_I, MNEM_CSRRS, "csrrs") \
X(0x0000707f, 0x00003073, FMT_I, MNEM_CSRRC, "csrrc") \
X(0x0000707f, 0x00005073, FMT_I, MNEM_CSRRWI, "csrrwi") \
X(0x0000707f, 0x00006073, FMT_I, MNEM_CSRRSI, "csrrsi") \
X(0x0000707f, 0x00007073, FMT_I, MNEM_CSRRCI, "csrrci")
#if EXT_M
#define OPCODE_LIST_M \
X(0xfe00707f, 0x02000033, FMT_R, MNEM_MUL, "mul") \
X(0xfe00707f, 0x02001033, FMT_R, MNEM_MULH, "mulh") \
X(0xfe00707f, 0x02002033, FMT_R, MNEM_MULHSU, "mulhsu") \
X(0xfe00707f, 0x02003033, FMT_R, MNEM_MULHU, "mulhu") \
X(0xfe00707f, 0x02004033, FMT_R, MNEM_DIV, "div") \
X(0xfe00707f, 0x02005033, FMT_R, MNEM_DIVU, "divu") \
X(0xfe00707f, 0x02006033, FMT_R, MNEM_REM, "rem") \
X(0xfe00707f, 0x02007033, FMT_R, MNEM_REMU, "remu")
#else
#define OPCODE_LIST_M
#endif
#if EXT_F
#define OPCODE_LIST_F \
X(0x0000707f, 0x00002007, FMT_I, MNEM_FLW, "flw") \
X(0x0000707f, 0x00002027, FMT_S, MNEM_FSW, "fsw") \
X(0x0600007f, 0x00000043, FMT_R4, MNEM_FMADD_S, "fmadd.s") \
X(0x0600007f, 0x00000047, FMT_R4, MNEM_FMSUB_S, "fmsub.s") \
X(0x0600007f, 0x0000004b, FMT_R4, MNEM_FNMSUB_S, "fnmsub.s") \
X(0x0600007f, 0x0000004e, FMT_R4, MNEM_FNMADD_S, "fnmadd.s") \
X(0xfe00007f, 0x00000053, FMT_R, MNEM_FADD_S, "fadd.s") \
X(0xfe00007f, 0x08000053, FMT_R, MNEM_FSUB_S, "fsub.s") \
X(0xfe00007f, 0x10000053, FMT_R, MNEM_FMUL_S, "fmul.s") \
X(0xfe00007f, 0x18000053, FMT_R, MNEM_FDIV_S, "fdiv.s") \
X(0xfff0007f, 0x58000053, FMT_R, MNEM_FSQRT_S, "fsqrt.s") \
X(0xfe00707f, 0x20000053, FMT_R, MNEM_FSGNJ_S, "fsgnj.s") \
X(0xfe00707f, 0x20001053, FMT_R, MNEM_FSGNJN_S, "fsgnjn.s") \
X(0xfe00707f, 0x20002053, FMT_R, MNEM_FSGNJX_S, "fsgnjx.s") \
X(0xfe00707f, 0x28000053, FMT_R, MNEM_FMIN_S, "fmin.s") \
X(0xfe00707f, 0x28001053, FMT_R, MNEM_FMAX_S, "fmax.s") \
X(0xfff0007f, 0xc0000053, FMT_R, MNEM_FCVT_W_S, "fcvt.w.s") \
X(0xfff0007f, 0xc0100053, FMT_R, MNEM_FCVT_WU_S, "fcvt.wu.s") \
X(0xfff0707f, 0xe0000053, FMT_R, MNEM_FMV_X_W, "fmv.x.w") \
X(0xfe00707f, 0xa0002053, FMT_R, MNEM_FEQ_S, "feq.s") \
X(0xfe00707f, 0xa0001053, FMT_R, MNEM_FLT_S, "flt.s") \
X(0xfe00707f, 0xa0000053, FMT_R, MNEM_FLE_S, "fle.s") \
X(0xfff0707f, 0xe0001053, FMT_R, MNEM_FCLASS_S, "fclass.s") \
X(0xfff0007f, 0xd0000053, FMT_R, MNEM_FCVT_S_W, "fcvt.s.w") \
X(0xfff0007f, 0xd0100053, FMT_R, MNEM_FCVT_S_WU, "fcvt.s.wu") \
X(0xfff0707f, 0xe0000053, FMT_R, MNEM_FMV_W_X, "fmv.w.x")
#else
#define OPCODE_LIST_F
#endif
#if EXT_D
#define OPCODE_LIST_D \
X(0x0000707f, 0x00003007, FMT_I, MNEM_FLD, "fld") \
X(0x0000707f, 0x00003027, FMT_S, MNEM_FSD, "fsd") \
X(0x0600007f, 0x02000043, FMT_R4, MNEM_FMADD_D, "fmadd.d") \
X(0x0600007f, 0x02000047, FMT_R4, MNEM_FMSUB_D, "fmsub.d") \
X(0x0600007f, 0x0200004b, FMT_R4, MNEM_FNMSUB_D, "fnmsub.d") \
X(0x0600007f, 0x0200004f, FMT_R4, MNEM_FNMADD_D, "fnmadd.d") \
X(0xfe00007f, 0x02000053, FMT_R, MNEM_FADD_D, "fadd.d") \
X(0xfe00007f, 0x0a000053, FMT_R, MNEM_FSUB_D, "fsub.d") \
X(0xfe00007f, 0x12000053, FMT_R, MNEM_FMUL_D, "fmul.d") \
X(0xfe00007f, 0x1a000053, FMT_R, MNEM_FDIV_D, "fdiv.d") \
X(0xfff0007f, 0x5a000053, FMT_R, MNEM_FSQRT_D, "fsqrt.d") \
X(0xfe00707f, 0x22000053, FMT_R, MNEM_FSGNJ_D, "fsgnj.d") \
X(0xfe00707f, 0x22001053, FMT_R, MNEM_FSGNJN_D, "fsgnjn.d") \
X(0xfe00707f, 0x22002053, FMT_R, MNEM_FSGNJX_D, "fsgnjx.d") \
X(0xfe00707f, 0x2a000053, FMT_R, MNEM_FMIN_D, "fmin.d") \
X(0xfe00707f, 0x2a001053, FMT_R, MNEM_FMAX_D, "fmax.d") \
X(0xfff0007f, 0x40100053, FMT_R, MNEM_FCVT_S_D, "fcvt.s.d") \
X(0xfff0007f, 0x42000053, FMT_R, MNEM_FCVT_D_S, "fcvt.d.s") \
X(0xfe00707f, 0xa2002053, FMT_R, MNEM_FEQ_D, "feq.d") \
X(0xfe00707f, 0xa2001053, FMT_R, MNEM_FLT_D, "flt.d") \
X(0xfe00707f, 0xa2000053, FMT_R, MNEM_FLE_D, "fle.d") \
X(0xfff0707f, 0xe2001053, FMT_R, MNEM_FCLASS_D, "fclass.d") \
X(0xfff0007f, 0xc2000053, FMT_R, MNEM_FCVT_W_D, "fcvt.w.d") \
X(0xfff0007f, 0xc2100053, FMT_R, MNEM_FCVT_WU_D, "fcvt.wu.d") \
X(0xfff0007f, 0xd2000053, FMT_R, MNEM_FCVT_D_W, "fcvt.d.w") \
X(0xfff0007f, 0xd2100053, FMT_R, MNEM_FCVT_D_WU, "fcvt.d.wu")
#else
#define OPCODE_LIST_D
#endif
#if EXT_A
#define OPCODE_LIST_A \
X(0xf9f0707f, 0x1000202f, FMT_R, MNEM_LR_W, "lr.w") \
X(0xf800707f, 0x1800202f, FMT_R, MNEM_SC_W, "sc.w") \
X(0xf800707f, 0x0800202f, FMT_R, MNEM_AMOSWAP_W, "amoswap.w") \
X(0xf800707f, 0x0000202f, FMT_R, MNEM_AMOADD_W, "amoadd.w") \
X(0xf800707f, 0x2000202f, FMT_R, MNEM_AMOXOR_W, "amoxor.w") \
X(0xf800707f, 0x6000202f, FMT_R, MNEM_AMOAND_W, "amoand.w") \
X(0xf800707f, 0x4000202f, FMT_R, MNEM_AMOOR_W, "amoor.w") \
X(0xf800707f, 0x8000202f, FMT_R, MNEM_AMOMIN_W, "amomin.w") \
X(0xf800707f, 0xa000202f, FMT_R, MNEM_AMOMAX_W, "amomax.w") \
X(0xf800707f, 0xc000202f, FMT_R, MNEM_AMOMINU_W, "amominu.w") \
X(0xf800707f, 0xe000202f, FMT_R, MNEM_AMOMAXU_W, "amomaxu.w")
#else
#define OPCODE_LIST_A
#endif
#if EXT_C
#define OPCODE_LIST_C \
X(0xef83, 0x0001, FMT_CI, MNEM_C_NOP, "c.nop") \
X(0xe003, 0x0001, FMT_CI, MNEM_C_ADDI, "c.addi") \
X(0xe003, 0x2001, FMT_CJ, MNEM_C_JAL, "c.jal") \
X(0xe003, 0x4001, FMT_CI, MNEM_C_LI, "c.li") \
X(0xef83, 0x6101, FMT_CI, MNEM_C_ADDI16SP, "c.addi16sp") \
X(0xe003, 0x6001, FMT_CI, MNEM_C_LUI, "c.lui") \
X(0xec03, 0x8001, FMT_CI, MNEM_C_SRLI, "c.srli") \
X(0xec03, 0x8401, FMT_CI, MNEM_C_SRAI, "c.srai") \
X(0xec03, 0x8801, FMT_CI, MNEM_C_ANDI, "c.andi") \
X(0xfc63, 0x8c01, FMT_CR, MNEM_C_SUB, "c.sub") \
X(0xfc63, 0x8c21, FMT_CR, MNEM_C_XOR, "c.xor") \
X(0xfc63, 0x8c41, FMT_CR, MNEM_C_OR, "c.or") \
X(0xfc63, 0x8c61, FMT_CR, MNEM_C_AND, "c.and") \
X(0xe003, 0xa001, FMT_CJ, MNEM_C_J, "c.j") \
X(0xe003, 0xc001, FMT_CB, MNEM_C_BEQZ, "c.beqz") \
X(0xe003, 0xe001, FMT_CB, MNEM_C_BNEZ, "c.bnez") \
X(0xffff, 0x0000, FMT_CIW, MNEM_C_ILLEGAL, "Illegal instruction") \
X(0xe003, 0x0000, FMT_CIW, MNEM_C_ADDI4SPN, "c.addi4spn") \
X(0xe003, 0x2000, FMT_CL, MNEM_C_FLD, "c.fld") \
X(0xe003, 0x4000, FMT_CL, MNEM_C_LW, "c.lw") \
X(0xe003, 0x6000, FMT_CL, MNEM_C_FLW, "c.flw") \
X(0xe003, 0xa000, FMT_CL, MNEM_C_FSD, "c.fsd") \
X(0xe003, 0xc000, FMT_CL, MNEM_C_SW, "c.sw") \
X(0xe003, 0xe000, FMT_CL, MNEM_C_FSW, "c.fsw") \
X(0xe003, 0x0002, FMT_CI, MNEM_C_SLLI, "c.slli") \
X(0xf07f, 0x0002, FMT_CI, MNEM_C_SLLI64, "c.slli64") \
X(0xe003, 0x2002, FMT_CSS, MNEM_C_FLDSP, "c.fldsp") \
X(0xe003, 0x3002, FMT_CSS, MNEM_C_LWSP, "c.lwsp") \
X(0xe003, 0x6002, FMT_CSS, MNEM_C_FLWSP, "c.flwsp") \
X(0xf07f, 0x8002, FMT_CJ, MNEM_C_JR, "c.jr") \
X(0xf003, 0x8002, FMT_CR, MNEM_C_MV, "c.mv") \
X(0xffff, 0x9002, FMT_CI, MNEM_C_EBREAK, "c.ebreak") \
X(0xf07f, 0x9002, FMT_CJ, MNEM_C_JALR, "c.jalr") \
X(0xf003, 0x9002, FMT_CR, MNEM_C_ADD, "c.add") \
X(0xe003, 0xa002, FMT_CSS, MNEM_C_FSDSP, "c.fsdsp") \
X(0xe003, 0xc002, FMT_CSS, MNEM_C_SWSP, "c.swsp") \
X(0xe003, 0xe002, FMT_CSS, MNEM_C_FSWSP, "c.fswsp")
#else
#define OPCODE_LIST_C
#endif
// TODO: vector
// TODO: 64-bit
#if EXT_PRIV
#define OPCODE_LIST_PRIV \
X(0xffffffff, 0x10200073, FMT_R, MNEM_SRET, "sret") \
X(0xffffffff, 0x30200073, FMT_R, MNEM_MRET, "mret") \
X(0xffffffff, 0x10500073, FMT_R, MNEM_WFI, "wfi") \
X(0xfe007fff, 0x12000073, FMT_R, MNEM_SFENCE_VMA, "sfence.vma")
#else
#define OPCODE_LIST_PRIV
#endif
#define OPCODE_LIST \
OPCODE_LIST_RV32I \
OPCODE_LIST_M \
OPCODE_LIST_F \
OPCODE_LIST_D \
OPCODE_LIST_A \
OPCODE_LIST_C \
OPCODE_LIST_PRIV
#define REG_LIST \
X(R_X0, "x0") \
X(R_RA, "ra") \
X(R_SP, "sp") \
X(R_GP, "gp") \
X(R_TP, "tp") \
X(R_T0, "t0") \
X(R_T1, "t1") \
X(R_T2, "t2") \
X(R_S0, "s0") \
X(R_FP = 8, "fp") \
X(R_S1, "s1") \
X(R_A0, "a0") \
X(R_A1, "a1") \
X(R_A2, "a2") \
X(R_A3, "a3") \
X(R_A4, "a4") \
X(R_A5, "a5") \
X(R_A6, "a6") \
X(R_A7, "a7") \
X(R_S2, "s2") \
X(R_S3, "s3") \
X(R_S4, "s4") \
X(R_S5, "s5") \
X(R_S6, "s6") \
X(R_S7, "s7") \
X(R_S8, "s8") \
X(R_S9, "s9") \
X(R_S10, "s10") \
X(R_S11, "s11") \
X(R_T3, "t3") \
X(R_T4, "t4") \
X(R_T5, "t5") \
X(R_T6, "t6")
enum {
#define X(ENUM, STR) ENUM,
REG_LIST
#undef X
};
const char *reg_names[] = {
#define X(ENUM, STR) STR,
REG_LIST
#undef X
};
typedef enum {
#define X(MASK, VALUE, FMT, MNEM, STR) MNEM,
OPCODE_LIST
#undef X
MNEM_INVALID
} mnemonic_t;
const char *op_mnemonics[] = {
#define X(MASK, VALUE, FMT, MNEM, STR) STR,
OPCODE_LIST
#undef X
};
typedef enum {
FMT_R,
FMT_R4,
FMT_I,
FMT_S,
FMT_B,
FMT_U,
FMT_J,
FMT_CB,
FMT_CI,
FMT_CIW,
FMT_CJ,
FMT_CL,
FMT_CR,
FMT_CSS
} fmt_t;
typedef struct {
fmt_t format;
mnemonic_t mnemonic;
} instr_header_t;
typedef struct {
instr_header_t header;
int rd;
int func3;
int rs1;
int rs2;
int func7;
} r_instr_t;
typedef struct {
instr_header_t header;
int rd;
int func3;
int rs1;
int imm_11_0;
} i_instr_t;
typedef struct {
instr_header_t header;
int imm_4_0;
int func3;
int rs1;
int rs2;
int imm_11_5;
} s_instr_t;
typedef struct {
instr_header_t header;
int imm_11_a7;
int imm_4_1;
int func3;
int rs1;
int rs2;
int imm_12;
int imm_10_5;
} b_instr_t;
typedef struct {
instr_header_t header;
int rd;
int imm_31_12;
} u_instr_t;
typedef struct {
instr_header_t header;
int rd;
int imm_19_12;
int imm_11_a20;
int imm_10_1;
int imm_20;
} j_instr_t;
typedef union {
r_instr_t ri;
i_instr_t ii;
s_instr_t si;
b_instr_t bi;
u_instr_t ui;
j_instr_t ji;
} instr_t;
struct {
uint32_t regs[32];
uint32_t pc;
} state;
/* memory model */
/* TODO: use dictionary to implement sparse array */
uint32_t memory[256];
uint32_t M_r(uint32_t addr, int size)
{
addr %= 1024;
if (addr % size != 0) {
fprintf(stderr,
"error: unaligned read access, addr = 0x%08x, size = %d\n",
addr, size);
exit(EXIT_FAILURE);
}
uint32_t word = memory[addr / 4];
uint32_t data;
if (size == 1)
data = (word >> (addr % 4) * 8) & 0xff;
else if (size == 2)
data = (word >> (addr % 4) * 8) & 0xffff;
else if (size == 4)
data = word;
return data;
}
void M_w(uint32_t addr, uint32_t data, int size)
{
if (addr % size != 0) {
fprintf(stderr,
"error: unaligned write access, addr = %08x, size = %d\n", addr,
size);
exit(EXIT_FAILURE);
}
addr %= 1024;
uint32_t word = memory[addr / 4];
if (size == 1) {
word &= ~(0xff << (addr % 4) * 8);
word |= (data & 0xff) << 8 * (addr % 4);
} else if (size == 2) {
word &= ~(0xffff << (addr % 4) * 8);
word |= (data & 0xffff) << 8 * (addr % 4);
} else if (size == 4) {
word = data;
}
memory[addr / 4] = word;
}
/* TODO: handle RV64 */
static uint32_t sext(uint32_t x, int w)
{
if (w == 32)
return x;
int msb = (x >> (w - 1)) & 0x1;
uint32_t all1 = ~0;
return msb ? x | ((all1 >> w) << w) : x & ((1 << w) - 1);
}
static uint32_t get_imm(instr_t *i_p)
{
uint32_t imm;
instr_header_t *header_p = (instr_header_t *) i_p;
switch (header_p->format) {
case FMT_I:
imm = sext(i_p->ii.imm_11_0, 12);
break;
case FMT_S:
imm = sext((i_p->si.imm_11_5 << 5) + i_p->si.imm_4_0, 12);
break;
case FMT_B:
imm = sext((i_p->bi.imm_12 << 12) + (i_p->bi.imm_11_a7 << 11) +
(i_p->bi.imm_10_5 << 5) + (i_p->bi.imm_4_1 << 1),
13);
break;
case FMT_U:
imm = (i_p->ui.imm_31_12 << 12);
break;
case FMT_J:
imm = sext((i_p->ji.imm_20 << 20) + (i_p->ji.imm_19_12 << 12) +
(i_p->ji.imm_11_a20 << 11) + (i_p->ji.imm_10_1 << 1),
21);
break;
default:
imm = 0;
assert(0);
break;
}
return imm;
}
/* TODO: confirm that all instructions print correctly */
static int snprint_instr(char *str, size_t size, instr_t *i_p)
{
instr_header_t *header_p = (instr_header_t *) i_p;
const char *mnemonic = op_mnemonics[header_p->mnemonic];
const char *rd;
const char *rs1;
const char *rs2;
int imm;
int n;
switch (header_p->format) {
case FMT_R:
rd = reg_names[i_p->ri.rd];
rs1 = reg_names[i_p->ri.rs1];
rs2 = reg_names[i_p->ri.rs2];
n = snprintf(str, size, "%s %s,%s,%s", mnemonic, rd, rs1, rs2);
break;
case FMT_I:
rd = reg_names[i_p->ii.rd];
rs1 = reg_names[i_p->ii.rs1];
imm = get_imm(i_p);
if (mnemonic[0] == 'l') {
n = snprintf(str, size, "%s %s,%d(%s)", mnemonic, rd, imm, rs1);
} else if (mnemonic[0] == 'e') {
n = snprintf(str, size, "%s", mnemonic);
} else {
n = snprintf(str, size, "%s %s,%s,%d", mnemonic, rd, rs1, imm);
}
break;
case FMT_S:
rs1 = reg_names[i_p->si.rs1];
rs2 = reg_names[i_p->si.rs2];
imm = get_imm(i_p);
n = snprintf(str, size, "%s %s,%d(%s)", mnemonic, rs2, imm, rs1);
break;
case FMT_B:
rs1 = reg_names[i_p->bi.rs1];
rs2 = reg_names[i_p->bi.rs2];
imm = get_imm(i_p);
n = snprintf(str, size, "%s %s,%s,%d", mnemonic, rs1, rs2, imm);
break;
case FMT_U:
rd = reg_names[i_p->ui.rd];
imm = get_imm(i_p);
n = snprintf(str, size, "%s %s,%d", mnemonic, rd, imm);
break;
case FMT_J:
rd = reg_names[i_p->ji.rd];
imm = get_imm(i_p);
n = snprintf(str, size, "%s %s,%d", mnemonic, rd, imm);
break;
// TODO
case FMT_R4:
assert(0);
break;
case FMT_CB:
assert(0);
break;
case FMT_CI:
assert(0);
break;
case FMT_CIW:
assert(0);
break;
case FMT_CJ:
assert(0);
break;
case FMT_CL:
assert(0);
break;
case FMT_CR:
assert(0);
break;
case FMT_CSS:
assert(0);
break;
default:
assert(0);
break;
}
return n;
}
/* TODO: some immediate field constraints are not included */
static instr_t decode(uint32_t op)
{
instr_t output;
instr_header_t *header_p = (instr_header_t *) &output;
int rd = MASK_MSB_LSB(op, 11, 7);
int rs1 = MASK_MSB_LSB(op, 19, 15);
int rs2 = MASK_MSB_LSB(op, 24, 20);
int func3 = MASK_MSB_LSB(op, 14, 12);
int func7 = MASK_MSB_LSB(op, 31, 25);
int imm_11_0 = MASK_MSB_LSB(op, 31, 20);
int imm_4_0 = MASK_MSB_LSB(op, 11, 7);
int imm_11_5 = MASK_MSB_LSB(op, 31, 25);
int imm_11_a7 = MASK_MSB_LSB(op, 7, 7);
int imm_4_1 = MASK_MSB_LSB(op, 11, 8);
int imm_10_5 = MASK_MSB_LSB(op, 30, 25);
int imm_12 = MASK_MSB_LSB(op, 31, 31);
int imm_31_12 = MASK_MSB_LSB(op, 31, 12);
int imm_19_12 = MASK_MSB_LSB(op, 19, 12);
int imm_11_a20 = MASK_MSB_LSB(op, 20, 20);
int imm_10_1 = MASK_MSB_LSB(op, 30, 21);
int imm_20 = MASK_MSB_LSB(op, 31, 31);
mnemonic_t m = MNEM_INVALID;
;
if (0)
;
#define X(MASK, VALUE, FMT, MNEM, STR) else if ((op & MASK) == VALUE) m = MNEM;
OPCODE_LIST
#undef X
fmt_t fmt;
switch (m) {
#define X(MASK, VALUE, FMT, MNEM, STR) \
case MNEM: \
fmt = FMT; \
break;
OPCODE_LIST
#undef X
default:
assert(0);
break;
}
header_p->mnemonic = m;
header_p->format = fmt;
switch (fmt) {
case FMT_R:
output.ri.rd = rd;
output.ri.func3 = func3;
output.ri.rs1 = rs1;
output.ri.rs2 = rs2;
output.ri.func7 = func7;
break;
case FMT_I:
output.ii.rd = rd;
output.ii.func3 = func3;
output.ii.rs1 = rs1;
output.ii.imm_11_0 = imm_11_0;
break;
case FMT_S:
output.si.imm_4_0 = imm_4_0;
output.si.func3 = func3;
output.si.rs1 = rs1;
output.si.rs2 = rs2;
output.si.imm_11_5 = imm_11_5;
break;
case FMT_B:
output.bi.imm_11_a7 = imm_11_a7;
output.bi.imm_4_1 = imm_4_1;
output.bi.func3 = func3;
output.bi.rs1 = rs1;
output.bi.rs2 = rs2;
output.bi.imm_12 = imm_12;
output.bi.imm_10_5 = imm_10_5;
break;
case FMT_U:
output.ui.rd = rd;
output.ui.imm_31_12 = imm_31_12;
break;
case FMT_J:
output.ji.rd = rd;
output.ji.imm_19_12 = imm_19_12;
output.ji.imm_11_a20 = imm_11_a20;
output.ji.imm_10_1 = imm_10_1;
output.ji.imm_20 = imm_20;
break;
// TODO
case FMT_R4:
assert(0);
break;
case FMT_CB:
assert(0);
break;
case FMT_CI:
assert(0);
break;
case FMT_CIW:
assert(0);
break;
case FMT_CJ:
assert(0);
break;
case FMT_CL:
assert(0);
break;
case FMT_CR:
assert(0);
break;
case FMT_CSS:
assert(0);
break;
default:
assert(0);
break;
}
return output;
}
static void reset()
{
size_t i;
for (i = 0; i < 32; i++) {
state.regs[i] = 0;
}
state.pc = 0;
/* TODO: remove these; put them in the test itself */
state.regs[R_A1] = 5; // n
state.regs[R_A0] = 0x54; // &a[0]
state.regs[R_RA] = 0x4c; // return address
}
/* TODO: pc, x[0] potentially bug-prone */
static int step()
{
uint32_t op = M_r(state.pc, 4);
// compressed
int compressed = ((op & 3) != 3);
if (compressed)
op &= 0xffff;
instr_t instr = decode(op);
instr_header_t *header_p = (instr_header_t *) &instr;
int32_t *x = (int32_t *) state.regs;
uint32_t *x_u = state.regs;
uint32_t pc = state.pc;
uint32_t next_pc = pc + (compressed ? 2 : 4);
int rd;
int rs1;
int rs2;
int32_t imm;
uint32_t imm_u;
int32_t t;
int shamt;
int pred;
int succ;
int csr;
int zimm;
switch (header_p->format) {
case FMT_R:
rd = instr.ri.rd;
rs1 = instr.ri.rs1;
rs2 = instr.ri.rs2;
break;
case FMT_I:
rd = instr.ii.rd;
rs1 = instr.ii.rs1;
imm = get_imm(&instr);
shamt = MASK_MSB_LSB(instr.ii.imm_11_0, 4, 0);
pred = MASK_MSB_LSB(instr.ii.imm_11_0, 7, 4);
succ = MASK_MSB_LSB(instr.ii.imm_11_0, 3, 0);
csr = instr.ii.imm_11_0;
zimm = instr.ii.rs1;
break;
case FMT_S:
rs1 = instr.si.rs1;
rs2 = instr.si.rs2;
imm = get_imm(&instr);
imm_u = (uint32_t) imm;
break;
case FMT_B:
rs1 = instr.bi.rs1;
rs2 = instr.bi.rs2;
imm = get_imm(&instr);
imm_u = (uint32_t) imm;
break;
case FMT_U:
rd = instr.ii.rd;
imm = get_imm(&instr);
imm_u = (uint32_t) imm;
break;
case FMT_J:
rd = instr.ii.rd;
imm = get_imm(&instr);
imm_u = (uint32_t) imm;
break;
// TODO
case FMT_R4:
assert(0);
break;
case FMT_CB:
assert(0);
break;
case FMT_CI:
assert(0);
break;
case FMT_CIW:
assert(0);
break;
case FMT_CJ:
assert(0);
break;
case FMT_CL:
assert(0);
break;
case FMT_CR:
assert(0);
break;
case FMT_CSS:
assert(0);
break;
default:
assert(0);
break;
}
int xd_set = 0;
int write = 0;
int load = 0;
int br_taken = 0;
switch (header_p->mnemonic) {
case MNEM_LUI:
x[rd] = imm;
xd_set = 1;
break;
case MNEM_AUIPC:
x[rd] = pc + imm;
xd_set = 1;
break;
case MNEM_JAL:
x[rd] = pc + 4;
next_pc = pc + imm;
br_taken = 1;
xd_set = 1;
break;
case MNEM_JALR:
t = pc + 4;
next_pc = (x[rs1] + imm) & ~1;
br_taken = 1;
x[rd] = t;
xd_set = 1;
break;
case MNEM_BEQ:
if (x[rs1] == x[rs2]) {
next_pc = pc + imm;
br_taken = 1;
}
break;
case MNEM_BNE:
if (x[rs1] != x[rs2]) {
next_pc = pc + imm;
br_taken = 1;
}
break;
case MNEM_BLT:
if (x[rs1] < x[rs2]) {
next_pc = pc + imm;
br_taken = 1;
}
break;
case MNEM_BGE:
if (x[rs1] >= x[rs2]) {
next_pc = pc + imm;
br_taken = 1;
}
break;
case MNEM_BLTU:
if (x_u[rs1] < x_u[rs2]) {
next_pc = pc + imm;
br_taken = 1;
}
break;
case MNEM_BGEU:
if (x_u[rs1] >= x_u[rs2]) {
next_pc = pc + imm;
br_taken = 1;
}
break;
case MNEM_LB:
x[rd] = sext(M_r(x[rs1] + imm, 1), 8);
xd_set = 1;
load = 1;
break;
case MNEM_LH:
x[rd] = sext(M_r(x[rs1] + imm, 2), 16);
xd_set = 1;
load = 1;
break;
case MNEM_LW:
x[rd] = sext(M_r(x[rs1] + imm, 4), 32);
xd_set = 1;
load = 1;
break;
case MNEM_LBU:
x[rd] = M_r(x[rs1] + imm, 1);
xd_set = 1;
break;
case MNEM_LHU:
x[rd] = M_r(x[rs1] + imm, 2);
xd_set = 1;
break;
case MNEM_SB:
M_w(x[rs1] + imm, x[rs2], 1);
write = 1;
break;
case MNEM_SH:
M_w(x[rs1] + imm, x[rs2], 2);
write = 1;
break;
case MNEM_SW:
M_w(x[rs1] + imm, x[rs2], 4);
write = 1;
break;
case MNEM_ADDI:
x[rd] = x[rs1] + imm;
xd_set = 1;
break;
case MNEM_SLTI:
x[rd] = x[rs1] < imm;
xd_set = 1;
break;
case MNEM_SLTIU:
x[rd] = x_u[rs1] < imm_u;
xd_set = 1;
break;
case MNEM_XORI:
x[rd] = x[rs1] ^ imm;
xd_set = 1;
break;
case MNEM_ORI:
x[rd] = x[rs1] | imm;
xd_set = 1;
break;
case MNEM_ANDI:
x[rd] = x[rs1] & imm;
xd_set = 1;
break;
case MNEM_SLLI:
x[rd] = x[rs1] << shamt;
xd_set = 1;
break;
case MNEM_SRLI:
/* TODO: add static assertion that right-shifting of signed value is
* arithmetic */
x[rd] = x_u[rs1] >> shamt;
xd_set = 1;
break;
case MNEM_SRAI:
x[rd] = x[rs1] >> shamt;
xd_set = 1;
break;
case MNEM_ADD:
x[rd] = x[rs1] + x[rs2];
xd_set = 1;
break;
case MNEM_SUB:
x[rd] = x[rs1] - x[rs2];
xd_set = 1;
break;
case MNEM_SLL:
x[rd] = x[rs1] << x[rs2];
xd_set = 1;
break;
case MNEM_SLT:
x[rd] = x[rs1] < x[rs2];
xd_set = 1;
break;
case MNEM_SLTU:
x[rd] = x_u[rs1] < x_u[rs2];
xd_set = 1;
break;
case MNEM_XOR:
x[rd] = x[rs1] ^ x[rs1];
xd_set = 1;
break;
case MNEM_SRL:
x[rd] = x_u[rs1] >> x_u[rs2];
xd_set = 1;
break;
case MNEM_SRA:
x[rd] = x[rs1] >> x[rs2];
xd_set = 1;
break;
case MNEM_OR:
x[rd] = x[rs1] | x[rs1];
xd_set = 1;
break;
case MNEM_AND:
x[rd] = x[rs1] & x[rs1];
xd_set = 1;
break;
case MNEM_FENCE:
/* TODO */
break;
case MNEM_FENCE_I:
/* TODO */
break;