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成功使用print外设打印出hello world

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This commit is contained in:
andy
2025-04-17 19:03:28 +08:00
parent 333cc57c99
commit de4a5b9548
6 changed files with 493 additions and 239 deletions
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65
cpu/print.c Normal file
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@@ -0,0 +1,65 @@
#include "riscv.h"
#include "stdio.h"
#define PRINT_BASE_ADDR 0x40000000
#define PRINT_SIZE 0x4
#define dev_wr(addr) g_map[(addr-PRINT_BASE_ADDR) >> 2]
#define dev_wrb(addr) ((uint8_t *)g_map)[(addr-PRINT_BASE_ADDR)]
#define dev_wrh(addr) ((uint16_t *)g_map)[(addr-PRINT_BASE_ADDR) >> 1]
static uint32_t g_map[1];
static uint32_t read(uint32_t addr) {
if (!(addr & 0x3)) {
return dev_wr(addr);
} else if (!(addr & 0x1)) {
return dev_wrh(addr);
} else {
return dev_wrb(addr);
}
}
#define BUFF_LEN 1024
static char g_buff[BUFF_LEN];
static int g_index;
static void write(uint32_t addr, uint32_t data) {
// printf("print: write data=%x\n", data);
if (!(addr & 0x3)) {
dev_wr(addr) = data;
} else if (!(addr & 0x1)) {
dev_wrh(addr) = data;
} else {
dev_wrb(addr) = data;
}
if (g_index < BUFF_LEN) {
g_buff[g_index++] = data;
}
if (data == '\n') {
g_buff[g_index] = 0;
printf("%s", g_buff);
g_index = 0;
}
}
const static device_t g_print = {
.addr = PRINT_BASE_ADDR,
.size = PRINT_SIZE,
.read = read,
.write = write,
};
const device_t* print_dev() {
return &g_print;
}

10
cpu/print.h Normal file
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@@ -0,0 +1,10 @@
#ifndef print_h__
#define print_h__
#include "riscv.h"
const device_t* print_dev();
#endif

394
cpu/riscv.c
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@@ -1,145 +1,130 @@
#include "riscv.h"
#include "debug.h"
#include "print.h"
#define device_write(riscv,addr,value) \
for (int i = 0;i < riscv->device_num;i++) {\
if (riscv->device_list[i] && riscv->device_list[i]->write) {\
if(addr>=riscv->device_list[i]->addr && addr<riscv->device_list[i]->addr+riscv->device_list[i]->size) {\
riscv->device_list[i]->write(addr, value);\
return;\
}\
}\
}
#define device_read(riscv,addr,ret) \
for (int i = 0;i < riscv->device_num;i++) {\
if (riscv->device_list[i] && riscv->device_list[i]->read) {\
if(addr>=riscv->device_list[i]->addr && addr<riscv->device_list[i]->addr+riscv->device_list[i]->size) {\
ret=riscv->device_list[i]->read(addr);\
return ret;\
}\
}\
}
int riscv_print(riscv_t* riscv) {
printf("x0(zero): %08x\n", riscv->zero);
printf("x1(ra): %08x\n", riscv->ra);
printf("x2(sp): %08x\n", riscv->sp);
printf("x3(gp): %08x\n", riscv->gp);
printf("x4(tp): %08x\n", riscv->tp);
printf("x5(t0): %08x\n", riscv->t0);
printf("x6(t1): %08x\n", riscv->t1);
printf("x7(t2): %08x\n", riscv->t2);
printf("x8(s0|fp): %08x\n", riscv->fp);
printf("x9(s1): %08x\n", riscv->s1);
printf("x10(a0): %08x\n", riscv->a0);
printf("x11(a1): %08x\n", riscv->a1);
printf("x12(a2): %08x\n", riscv->a2);
printf("x13(a3): %08x\n", riscv->a3);
printf("x14(a4): %08x\n", riscv->a4);
printf("x15(a5): %08x\n", riscv->a5);
printf("x16(a6): %08x\n", riscv->a6);
printf("x17(a7): %08x\n", riscv->a7);
printf("x18(s2): %08x\n", riscv->s2);
printf("x19(s3): %08x\n", riscv->s3);
printf("x20(s4): %08x\n", riscv->s4);
printf("x21(s5): %08x\n", riscv->s5);
printf("x22(s6): %08x\n", riscv->s6);
printf("x23(s7): %08x\n", riscv->s7);
printf("x24(s8): %08x\n", riscv->s8);
printf("x25(s9): %08x\n", riscv->s9);
printf("x26(s10): %08x\n", riscv->s10);
printf("x27(s11): %08x\n", riscv->s11);
printf("x28(t3): %08x\n", riscv->t3);
printf("x29(t4): %08x\n", riscv->t4);
printf("x30(t5): %08x\n", riscv->t5);
printf("x31(t6): %08x\n", riscv->t6);
return 0;
}
/*
每个指令长度为32bit，分为6个类型
|--------------+------------+-----------+-------------+--------------+---------------|
| [31-25] | [24-20] | [19-15] | [14-12] | [11-7] | [6-0] |
|--------------+------------+-----------+-------------+--------------+---------------|
| funct7 | rs2 | rs1 | funct3 | rd | opcode | R-type 计算指令
|--------------+------------+-----------+-------------+--------------+---------------|
| imm[11:0] | rs1 | funct3 | rd | opcode | I-type 加载指令
|--------------+------------+-----------+-------------+--------------+---------------|
| imm[11:5] | rs2 | rs1 | funct3 | imm[4:0] | opcode | S-type 存储指令
|--------------+------------+-----------+-------------+--------------+---------------|
|imm[12] [10:5]| rs2 | rs1 | funct3 | imm[4:1][11] | opcode | B-type 分支指令
|--------------+------------+-----------+-------------+--------------+---------------|
| imm[31:12] | rd | opcode | U-type 立即数指令
|-----------------------------------------------------+--------------+---------------|
| imm[20] [10:1] [11] [19:12] | rd | opcode | J-type 跳转指令
|-----------------------------------------------------+--------------+---------------|
*/
// 定义opcode
#define opcode_lui 0x37 // U-type
#define opcode_auipc 0x17 // U-type
#define opcode_jal 0x6f // J-type
#define opcode_jalr 0x67 // I-type
// B-type
#define opcode_beq 0x63
#define opcode_bne 0x63
#define opcode_blt 0x63
#define opcode_bge 0x63
#define opcode_bltu 0x63
#define opcode_bgeu 0x63
// I-type
#define opcode_lb 0x03
#define opcode_lh 0x03
#define opcode_lw 0x03
#define opcode_lbu 0x03
#define opcode_lhu 0x03
// S-type
#define opcode_sb 0x23
#define opcode_sh 0x23
#define opcode_sw 0x23
// I-type
#define opcode_addi 0x13
#define opcode_slti 0x13
#define opcode_sltiu 0x13
#define opcode_xori 0x13
#define opcode_ori 0x13
#define opcode_andi 0x13
#define opcode_slli 0x13
#define opcode_srli 0x13
#define opcode_srai 0x13
// R-type
#define opcode_add 0x33
#define opcode_sub 0x33
#define opcode_sll 0x33
#define opcode_slt 0x33
#define opcode_sltu 0x33
#define opcode_xor 0x33
#define opcode_srl 0x33
#define opcode_sra 0x33
#define opcode_or 0x33
#define opcode_and 0x33
#define opcode_fence 0x0f
#define opcode_fence_i 0x0f
// 系统调用
#define opcode_ecall 0x73
#define opcode_ebreak 0x73
#define opcode_csrrw 0x73
#define opcode_csrrs 0x73
#define opcode_csrrc 0x73
#define opcode_csrrwi 0x73
#define opcode_csrrsi 0x73
#define opcode_csrrci 0x73
void mem_w_write(riscv_t * riscv, uint32_t addr, uint32_t value) {
if (addr >= MEM_ADDR_BASE && addr < MEM_ADDR_BASE + MEM_SIZE) {
mem_wr(addr) = value;
} else {
device_write(riscv, addr, value);
}
}
#define MEM_SIZE 1024*1024
#define MEM_ADDR_BASE 0x10000000
void mem_wh_write(riscv_t* riscv, uint32_t addr, uint16_t value) {
if (addr >= MEM_ADDR_BASE && addr < MEM_ADDR_BASE + MEM_SIZE) {
mem_wrh(addr) = value;
} else {
device_write(riscv, addr, value);
}
}
#define zero reg[0]
#define ra reg[1]
#define sp reg[2]
#define gp reg[3]
#define tp reg[4]
#define t0 reg[5]
#define t1 reg[6]
#define t2 reg[7]
#define s0 reg[8]
#define s1 reg[9]
#define a0 reg[10]
#define a1 reg[11]
#define a2 reg[12]
#define a3 reg[13]
#define a4 reg[14]
#define a5 reg[15]
#define a6 reg[16]
#define a7 reg[17]
#define s2 reg[18]
#define s3 reg[19]
#define s4 reg[20]
#define s5 reg[21]
#define s6 reg[22]
#define s7 reg[23]
#define s8 reg[24]
#define s9 reg[25]
#define s10 reg[26]
#define s11 reg[27]
#define t3 reg[28]
#define t4 reg[29]
#define t5 reg[30]
#define t6 reg[31]
void mem_wb_write(riscv_t* riscv, uint32_t addr, uint8_t value) {
if (addr >= MEM_ADDR_BASE && addr < MEM_ADDR_BASE + MEM_SIZE) {
mem_wrb(addr) = value;
} else {
device_write(riscv, addr, value);
}
}
#define fp reg[8]
uint32_t mem_w_read(riscv_t* riscv, uint32_t addr) {
uint32_t ret = 0xaaaaaaaa;
if (addr >= MEM_ADDR_BASE && addr < MEM_ADDR_BASE + MEM_SIZE) {
ret = mem_wr(addr);
} else if (addr>=riscv->rom_addr_base && addr<riscv->rom_addr_base+riscv->rom_size){
ret = rom_wr(addr);
} else {
device_read(riscv, addr, ret);
}
return ret;
}
uint16_t mem_wh_read(riscv_t* riscv, uint32_t addr) {
uint16_t ret = 0xaaaa;
if (addr >= MEM_ADDR_BASE && addr < MEM_ADDR_BASE + MEM_SIZE) {
ret = mem_wrh(addr);
} else if (addr>=riscv->rom_addr_base && addr<riscv->rom_addr_base+riscv->rom_size){
ret = rom_wrh(addr);
} else {
device_read(riscv, addr, ret);
}
return ret;
}
uint8_t mem_wb_read(riscv_t* riscv, uint32_t addr) {
uint8_t ret = 0xaa;
// printf("read addr=%08x\n", addr);
if (addr >= MEM_ADDR_BASE && addr < MEM_ADDR_BASE + MEM_SIZE) {
ret = mem_wrb(addr);
} else if (addr>=riscv->rom_addr_base && addr<riscv->rom_addr_base+riscv->rom_size){
ret = rom_wrb(addr);
} else {
device_read(riscv, addr, ret);
}
return ret;
}
typedef struct {
uint32_t mem[MEM_SIZE];
uint32_t* rom;
uint32_t rom_size;
uint32_t rom_addr_base;
uint32_t pc;
uint32_t reg[32];
uint32_t csrs[4096];
}riscv_t;
#define mem_wr(addr) riscv->mem[(addr-MEM_ADDR_BASE) >> 2]
#define mem_wrb(addr) ((uint8_t *)riscv->mem)[(addr-MEM_ADDR_BASE)]
#define mem_wrh(addr) ((uint16_t *)riscv->mem)[(addr-MEM_ADDR_BASE) >> 1]
void ins_add(riscv_t* riscv, int rs2, int rs1, int rd) {
riscv->reg[rd] = riscv->reg[rs1] + riscv->reg[rs2];
}
@@ -200,6 +185,7 @@ void ins_bltu(riscv_t* riscv, int rs2, int rs1, int imm) {
}
void ins_bne(riscv_t* riscv, int rs2, int rs1, int imm) {
// printf("bne %d %d imm=%08x\n", rs2, rs1, imm);
if (riscv->reg[rs1] != riscv->reg[rs2]) {
riscv->pc += imm;
}
@@ -264,38 +250,38 @@ void ins_jalr(riscv_t* riscv, int rs1, int imm, int rd) {
void ins_lb(riscv_t* riscv, int rs1, int imm, int rd) {
uint32_t addr = riscv->reg[rs1] + imm;
printf("lb %08x,imm=%d\n",addr,imm);
riscv->reg[rd] = (int)mem_wrb(addr);
// printf("lb %08x,imm=%d\n",addr,imm);
riscv->reg[rd] = (int)mem_wb_read(riscv, addr);
}
void ins_lbu(riscv_t* riscv, int rs1, int imm, int rd) {
uint32_t addr = riscv->reg[rs1] + imm;
printf("lbu %08x,imm=%d\n",addr,imm);
riscv->reg[rd] = mem_wrb(addr);
// printf("lbu %08x,imm=%d\n",addr,imm);
riscv->reg[rd] = mem_wb_read(riscv, addr);
}
void ins_lh(riscv_t* riscv, int rs1, int imm, int rd) {
uint32_t addr = riscv->reg[rs1] + imm;
printf("lh %08x,imm=%d\n",addr,imm);
riscv->reg[rd] = (int)mem_wrh(addr);
// printf("lh %08x,imm=%d\n",addr,imm);
riscv->reg[rd] = (int)mem_wh_read(riscv, addr);
}
void ins_lhu(riscv_t* riscv, int rs1, int imm, int rd) {
uint32_t addr = riscv->reg[rs1] + imm;
printf("lhu %08x,imm=%d\n",addr,imm);
riscv->reg[rd] = mem_wrh(addr);
// printf("lhu %08x,imm=%d\n",addr,imm);
riscv->reg[rd] = mem_wh_read(riscv, addr);
}
void ins_lw(riscv_t* riscv, int rs1, int imm, int rd) {
uint32_t addr = riscv->reg[rs1] + imm;
printf("lw %08x,imm=%d\n",addr,imm);
riscv->reg[rd] = mem_wr(addr);
// printf("lw %08x,imm=%d\n",addr,imm);
riscv->reg[rd] = (int)mem_w_read(riscv, addr);
}
void ins_lwu(riscv_t* riscv, int rs1, int imm, int rd) {
uint32_t addr = riscv->reg[rs1] + imm;
printf("lwu %08x,imm=%d\n",addr,imm);
riscv->reg[rd] = mem_wr(addr);
// printf("lwu %08x,imm=%d\n",addr,imm);
riscv->reg[rd] = mem_w_read(riscv, addr);
}
void ins_lui(riscv_t* riscv, int imm, int rd) {
@@ -317,20 +303,20 @@ void ins_ori(riscv_t* riscv, int rs1, int imm, int rd) {
void ins_sb(riscv_t* riscv, int rs2, int rs1, int imm) {
uint32_t addr = riscv->reg[rs1] + imm;
printf("sb %08x,imm=%d\n",addr,imm);
mem_wrb(addr) = riscv->reg[rs2];
// printf("sb %08x,imm=%d\n",addr,imm);
mem_wb_write(riscv, addr, riscv->reg[rs2]);
}
void ins_sh(riscv_t* riscv, int rs2, int rs1, int imm) {
uint32_t addr = riscv->reg[rs1] + imm;
printf("sh %08x,imm=%d\n",addr,imm);
mem_wrh(addr) = riscv->reg[rs2];
// printf("sh %08x,imm=%d\n",addr,imm);
mem_wh_write(riscv, addr, riscv->reg[rs2]);
}
void ins_sw(riscv_t* riscv, int rs2, int rs1, int imm) {
uint32_t addr = riscv->reg[rs1] + imm;
printf("sw %08x,imm=%d\n",addr,imm);
mem_wr(addr) = riscv->reg[rs2];
// printf("sw %08x,imm=%d\n",addr,imm);
mem_w_write(riscv, addr, riscv->reg[rs2]);
}
void ins_sll(riscv_t* riscv, int rs2, int rs1, int rd) {
@@ -417,54 +403,6 @@ void ins_xori(riscv_t* riscv, int rs1, int imm, int rd) {
riscv->reg[rd] = riscv->reg[rs1] ^ imm;
}
// 不需要做符号扩展
#define imm_u_type(_ins,_imm) {\
_imm = (_ins >> 12) << 12;\
}
// 20位符号扩展
#define imm_j_type(_ins,_imm) {\
_imm = ((_ins >> 21) & 0x3ff) << 1;\
_imm |= ((_ins >> 20) & 1) << 11;\
_imm |= ((_ins >> 12) & 0xff) << 12;\
_imm |= ((_ins >> 31) & 1) << 20;\
if(_imm&(1<<20)){\
_imm|=0xfff00000;\
}\
}
// 12位符号扩展
#define imm_i_type(_ins,_imm) {\
_imm = (_ins >> 20) & 0xfff;\
if(_imm&(1<<11)){\
_imm|=0xfffff000;\
}\
}
// 13位符号扩展
#define imm_b_type(_ins,_imm) {\
_imm = ((_ins >> 31) & 1) << 12;\
_imm |= ((_ins >> 7) & 0x1) << 11;\
_imm |= ((_ins >> 8) & 0xf) << 1;\
_imm |= ((_ins >> 25) & 0x1f) << 5;\
if(_imm&(1<<12)){\
_imm|=0xfffff000;\
}\
}
// 12位符号扩展
#define imm_s_type(_ins,_imm) {\
_imm = ((_ins >> 7) & 0x1f);\
_imm |= (_ins >> 25) << 5;\
if(_imm&(1<<11)){\
_imm|=0xfffff000;\
}\
}
#define imm_csr(_ins,_imm) {\
_imm = (_ins >> 20) & 0xfff;\
}
// 解析指令
int riscv_decode(riscv_t* riscv, uint32_t ins) {
int imm = 0;
@@ -671,47 +609,27 @@ int riscv_decode(riscv_t* riscv, uint32_t ins) {
return 0;
}
// 注册外设
int riscv_register_device(riscv_t* riscv, const device_t* device) {
if (riscv->device_num >= DEVICE_MAX_NUM) {
printf("riscv register device failed, device num out of range\n");
return -1;
}
// printf("device: base_addr=%08x, size=%08x\n", device->addr, device->size);
riscv->device_list[riscv->device_num] = device;
riscv->device_num++;
return 0;
}
int riscv_init(riscv_t* riscv, uint32_t* rom, uint32_t rom_addr_base, uint32_t rom_size) {
riscv->rom = rom;
riscv->rom_size = rom_size;
riscv->rom_addr_base = rom_addr_base;
riscv->pc = riscv->rom_addr_base;
}
int riscv_print(riscv_t* riscv) {
printf("x0(zero): %08x\n", riscv->zero);
printf("x1(ra): %08x\n", riscv->ra);
printf("x2(sp): %08x\n", riscv->sp);
printf("x3(gp): %08x\n", riscv->gp);
printf("x4(tp): %08x\n", riscv->tp);
printf("x5(t0): %08x\n", riscv->t0);
printf("x6(t1): %08x\n", riscv->t1);
printf("x7(t2): %08x\n", riscv->t2);
printf("x8(fp): %08x\n", riscv->fp);
printf("x9(s0): %08x\n", riscv->s0);
printf("x10(s1): %08x\n", riscv->s1);
printf("x11(a0): %08x\n", riscv->a0);
printf("x12(a1): %08x\n", riscv->a1);
printf("x13(a2): %08x\n", riscv->a2);
printf("x14(a3): %08x\n", riscv->a3);
printf("x15(a4): %08x\n", riscv->a4);
printf("x16(a5): %08x\n", riscv->a5);
printf("x17(a6): %08x\n", riscv->a6);
printf("x18(s2): %08x\n", riscv->s2);
printf("x19(s3): %08x\n", riscv->s3);
printf("x20(s4): %08x\n", riscv->s4);
printf("x21(s5): %08x\n", riscv->s5);
printf("x22(s6): %08x\n", riscv->s6);
printf("x23(s7): %08x\n", riscv->s7);
printf("x24(s8): %08x\n", riscv->s8);
printf("x25(s9): %08x\n", riscv->s9);
printf("x26(s10): %08x\n", riscv->s10);
printf("x27(s11): %08x\n", riscv->s11);
printf("x28(t3): %08x\n", riscv->t3);
printf("x29(t4): %08x\n", riscv->t4);
printf("x30(t5): %08x\n", riscv->t5);
printf("x31(t6): %08x\n", riscv->t6);
return 0;
}
int riscv_run(riscv_t* riscv) {
@@ -719,11 +637,11 @@ int riscv_run(riscv_t* riscv) {
uint32_t pc;
while (1) {
if(riscv->pc >= riscv->rom_addr_base + riscv->rom_size || riscv->pc < riscv->rom_addr_base){
printf("riscv run out of rom\n");
printf("riscv run out of rom pc=%08x\n",riscv->pc);
break;
}
uint32_t instr = riscv->rom[(riscv->pc-riscv->rom_addr_base) >> 2];
printf("pc: %08x instr: %08x\n", riscv->pc, instr);
// printf("pc: %08x instr: %08x\n", riscv->pc, instr);
pc = riscv->pc;
ret = riscv_decode(riscv, instr);
riscv->zero = 0;
@@ -731,12 +649,13 @@ int riscv_run(riscv_t* riscv) {
if (riscv->pc == pc) {
riscv->pc += 4;
}
riscv_print(riscv);
// riscv_print(riscv);
if(ret){
break;
}
}
printf("riscv run end\n");
return 0;
}
#include "stdio.h"
@@ -767,7 +686,11 @@ long get_file_size(FILE *stream)
return file_size;
}
riscv_t riscv={0};
riscv_t riscv = { 0 };
int thread_fun(void* t)
{
printf("riscv start\n");
@@ -783,6 +706,7 @@ int thread_fun(void* t)
fread(riscv.rom, 1, riscv.rom_size, file);
fclose(file);
riscv_register_device(&riscv, print_dev());
riscv_init(&riscv, riscv.rom, 0x80000000, riscv.rom_size);
riscv_run(&riscv);

204
cpu/riscv.h
View File

@@ -6,4 +6,208 @@
/*
每个指令长度为32bit，分为6个类型
|--------------+------------+-----------+-------------+--------------+---------------|
| [31-25] | [24-20] | [19-15] | [14-12] | [11-7] | [6-0] |
|--------------+------------+-----------+-------------+--------------+---------------|
| funct7 | rs2 | rs1 | funct3 | rd | opcode | R-type 计算指令
|--------------+------------+-----------+-------------+--------------+---------------|
| imm[11:0] | rs1 | funct3 | rd | opcode | I-type 加载指令
|--------------+------------+-----------+-------------+--------------+---------------|
| imm[11:5] | rs2 | rs1 | funct3 | imm[4:0] | opcode | S-type 存储指令
|--------------+------------+-----------+-------------+--------------+---------------|
|imm[12] [10:5]| rs2 | rs1 | funct3 | imm[4:1][11] | opcode | B-type 分支指令
|--------------+------------+-----------+-------------+--------------+---------------|
| imm[31:12] | rd | opcode | U-type 立即数指令
|-----------------------------------------------------+--------------+---------------|
| imm[20] [10:1] [11] [19:12] | rd | opcode | J-type 跳转指令
|-----------------------------------------------------+--------------+---------------|
*/
// 定义opcode
#define opcode_lui 0x37 // U-type
#define opcode_auipc 0x17 // U-type
#define opcode_jal 0x6f // J-type
#define opcode_jalr 0x67 // I-type
// B-type
#define opcode_beq 0x63
#define opcode_bne 0x63
#define opcode_blt 0x63
#define opcode_bge 0x63
#define opcode_bltu 0x63
#define opcode_bgeu 0x63
// I-type
#define opcode_lb 0x03
#define opcode_lh 0x03
#define opcode_lw 0x03
#define opcode_lbu 0x03
#define opcode_lhu 0x03
// S-type
#define opcode_sb 0x23
#define opcode_sh 0x23
#define opcode_sw 0x23
// I-type
#define opcode_addi 0x13
#define opcode_slti 0x13
#define opcode_sltiu 0x13
#define opcode_xori 0x13
#define opcode_ori 0x13
#define opcode_andi 0x13
#define opcode_slli 0x13
#define opcode_srli 0x13
#define opcode_srai 0x13
// R-type
#define opcode_add 0x33
#define opcode_sub 0x33
#define opcode_sll 0x33
#define opcode_slt 0x33
#define opcode_sltu 0x33
#define opcode_xor 0x33
#define opcode_srl 0x33
#define opcode_sra 0x33
#define opcode_or 0x33
#define opcode_and 0x33
#define opcode_fence 0x0f
#define opcode_fence_i 0x0f
// 系统调用
#define opcode_ecall 0x73
#define opcode_ebreak 0x73
#define opcode_csrrw 0x73
#define opcode_csrrs 0x73
#define opcode_csrrc 0x73
#define opcode_csrrwi 0x73
#define opcode_csrrsi 0x73
#define opcode_csrrci 0x73
#define MEM_SIZE 1024*1024
#define MEM_ADDR_BASE 0x10000000
#define zero reg[0]
#define ra reg[1]
#define sp reg[2]
#define gp reg[3]
#define tp reg[4]
#define t0 reg[5]
#define t1 reg[6]
#define t2 reg[7]
#define s0 reg[8]
#define s1 reg[9]
#define a0 reg[10]
#define a1 reg[11]
#define a2 reg[12]
#define a3 reg[13]
#define a4 reg[14]
#define a5 reg[15]
#define a6 reg[16]
#define a7 reg[17]
#define s2 reg[18]
#define s3 reg[19]
#define s4 reg[20]
#define s5 reg[21]
#define s6 reg[22]
#define s7 reg[23]
#define s8 reg[24]
#define s9 reg[25]
#define s10 reg[26]
#define s11 reg[27]
#define t3 reg[28]
#define t4 reg[29]
#define t5 reg[30]
#define t6 reg[31]
#define fp reg[8]
// 不需要做符号扩展
#define imm_u_type(_ins,_imm) {\
_imm = (_ins >> 12) << 12;\
}
// 20位符号扩展
#define imm_j_type(_ins,_imm) {\
_imm = ((_ins >> 21) & 0x3ff) << 1;\
_imm |= ((_ins >> 20) & 1) << 11;\
_imm |= ((_ins >> 12) & 0xff) << 12;\
_imm |= ((_ins >> 31) & 1) << 20;\
if(_imm&(1<<20)){\
_imm|=0xfff00000;\
}\
}
// 12位符号扩展
#define imm_i_type(_ins,_imm) {\
_imm = (_ins >> 20) & 0xfff;\
if(_imm&(1<<11)){\
_imm|=0xfffff000;\
}\
}
// 13位符号扩展
#define imm_b_type(_ins,_imm) {\
_imm = ((_ins >> 31) & 1) << 12;\
_imm |= ((_ins >> 7) & 0x1) << 11;\
_imm |= ((_ins >> 8) & 0xf) << 1;\
_imm |= ((_ins >> 25) & 0x3f) << 5;\
if(_imm&(1<<12)){\
_imm|=0xfffff000;\
}\
}
// 12位符号扩展
#define imm_s_type(_ins,_imm) {\
_imm = ((_ins >> 7) & 0x1f);\
_imm |= (_ins >> 25) << 5;\
if(_imm&(1<<11)){\
_imm|=0xfffff000;\
}\
}
#define imm_csr(_ins,_imm) {\
_imm = (_ins >> 20) & 0xfff;\
}
#define DEVICE_MAX_NUM 16
typedef struct {
uint32_t addr;
uint32_t size;
uint32_t (*read)(uint32_t addr);
void (*write)(uint32_t addr,uint32_t data);
}device_t;
typedef struct {
uint32_t mem[MEM_SIZE];
const device_t* device_list[DEVICE_MAX_NUM];
uint32_t device_num;
uint32_t* rom;
uint32_t rom_size;
uint32_t rom_addr_base;
uint32_t pc;
uint32_t reg[32];
uint32_t csrs[4096];
}riscv_t;
#define mem_wr(addr) riscv->mem[(addr-MEM_ADDR_BASE) >> 2]
#define mem_wrb(addr) ((uint8_t *)riscv->mem)[(addr-MEM_ADDR_BASE)]
#define mem_wrh(addr) ((uint16_t *)riscv->mem)[(addr-MEM_ADDR_BASE) >> 1]
#define rom_wr(addr) riscv->rom[(addr-riscv->rom_addr_base) >> 2]
#define rom_wrb(addr) ((uint8_t *)(riscv->rom))[(addr-riscv->rom_addr_base)]
#define rom_wrh(addr) ((uint16_t *)(riscv->rom))[(addr-riscv->rom_addr_base) >> 1]
#endif

32
riscv/main.c
View File

@@ -1,3 +1,26 @@
#include "stdint.h"
#define PRINT_BASE_ADDR *(uint8_t *)0x40000000
int my_putc(int c) {
PRINT_BASE_ADDR = c;
return c;
}
int my_puts(char *s) {
while (*s) {
my_putc(*s);
s++;
}
// for (int i = 0;i < 10;i++) {
// my_putc(*s);
// s++;
// }
return 0;
}
int add(int a, int b) {
@@ -6,8 +29,9 @@ int add(int a, int b) {
int main()
{
int a=1;
int b=2;
int c = add(a, b);
return c;
// int a=1;
// int b=2;
// int c = add(a, b);
my_puts("Hello World!\n");
return 0;
}

27
riscv/start.S
View File

@@ -7,4 +7,31 @@
_start:
la sp, _sp
/* Load data section */
la a0, _data_lma
la a1, _data
la a2, _edata
bgeu a1, a2, 2f
1:
lw t0, (a0)
sw t0, (a1)
addi a0, a0, 4
addi a1, a1, 4
bltu a1, a2, 1b
2:
/* Clear bss section */
la a0, __bss_start
la a1, _end
bgeu a0, a1, 2f
1:
sw zero, (a0)
addi a0, a0, 4
bltu a0, a1, 1b
2:
/* Call global constructors */
# la a0, __libc_fini_array
# call __libc_init_array
j main