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hopefully final core.h

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inixyz
2023-10-24 22:00:41 +03:00
parent a1edee0a58
commit d3e5e7bf9a
1 changed files with 33 additions and 11 deletions
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44
src/tinyriscv.h
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@@ -111,9 +111,8 @@ void tinyriscv_init(tinyriscv_hart* hart){
////////////////////////////////////////////////////////////////////////////////
u8 tinyriscv_valid_step(const tinyriscv_hart* hart){
if(!load32(hart->mem, hart->pc)) return 0;
if(!MEM(32, hart->mem, hart->pc)) return 0;
if(hart->pc >= hart->mem_size + tinyriscv_MEM_OFFSET) return 0;
return 1;
}
@@ -121,7 +120,7 @@ u8 tinyriscv_valid_step(const tinyriscv_hart* hart){
void tinyriscv_step(tinyriscv_hart* hart){
//fetch
const u32 inst = load32(hart->mem, hart->pc);
const u32 inst = MEM(32, hart->mem, hart->pc);
hart->pc += 4;
//decode
@@ -144,20 +143,43 @@ void tinyriscv_step(tinyriscv_hart* hart){
hart->x[0] = 0;
switch(opcode){
case /*LUI*/ 0x37: hart->x[rd] = inst & 0xfffff000; break;
case /*AUIPC*/ 0x17: hart->x[rd] = hart->pc - 4 + (inst & 0xfffff000); break;
case /*JAL*/ 0x6f: hart->x[rd] = hart->pc; hart->pc += imm_j - 4; break;
case /*LUI*/ 0x37:
hart->x[rd] = inst & 0xfffff000;
break;
case /*AUIPC*/ 0x17:
hart->x[rd] = hart->pc - 4 + (inst & 0xfffff000);
break;
case /*JAL*/ 0x6f:
hart->x[rd] = hart->pc; hart->pc += imm_j - 4;
break;
case /*JALR*/ 0x67:
const u32 ret_addr = hart->pc;
hart->pc = (hart->x[rs1] + (i32)imm_i) & 0xfffffffe;
hart->x[rd] = ret_addr;
break;
case 0x63: tinyriscv_b_type(&hart->pc, funct3, hart->x, rs1, rs2, imm_b); break;
case 0x03: tinyriscv_l_type(hart->mem, funct3, hart->x, rd, rs1, imm_i); break;
case 0x23: tinyriscv_s_type(hart->mem, funct3, hart->x, rs1, rs2, imm_s); break;
case 0x13: tinyriscv_i_type(funct3, funct7, hart->x, rd, rs1, imm_i, rs2); break;
case 0x33: tinyriscv_r_type(funct3, funct7, hart->x, rd, rs1, rs2); break;
case /*B-type*/ 0x63:
tinyriscv_B_type(funct3, hart->x, &hart->pc, rs1, rs2, imm_b);
break;
case /*L-type*/ 0x03:
tinyriscv_L_type(funct3, hart->x, hart->mem, rd, rs1, imm_i);
break;
case /*S-type*/ 0x23:
tinyriscv_S_type(funct3, hart->x, hart->mem, rs1, rs2, imm_s);
break;
case /*I-type*/ 0x13:
tinyriscv_I_type(funct3, funct7, hart->x, rd, rs1, imm_i, rs2);
break;
case /*R-type*/ 0x33:
tinyriscv_R_type(funct3, funct7, hart->x, rd, rs1, rs2);
break;
}
}