From 284c1f2521b58d779b0c407f014a724a907a5262 Mon Sep 17 00:00:00 2001
From: Raimon Zamora <jaildoctor@gmail.com>
Date: Tue, 12 Mar 2024 13:59:22 +0100
Subject: [PATCH] - First Commit

---
 .hgignore |   1 +
 48.rom    | Bin 0 -> 16384 bytes
 main.cpp  |  14 +++
 z80.cpp   | 256 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 z80.h     |   9 ++
 5 files changed, 280 insertions(+)
 create mode 100644 .hgignore
 create mode 100644 48.rom
 create mode 100644 main.cpp
 create mode 100644 z80.cpp
 create mode 100644 z80.h

diff --git a/.hgignore b/.hgignore
new file mode 100644
index 0000000..30d74d2
--- /dev/null
+++ b/.hgignore
@@ -0,0 +1 @@
+test
\ No newline at end of file
diff --git a/48.rom b/48.rom
new file mode 100644
index 0000000000000000000000000000000000000000..4d6895e0bbf3fa543f192a66a297192b3c969ac9
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literal 0
HcmV?d00001

diff --git a/main.cpp b/main.cpp
new file mode 100644
index 0000000..c5d77d5
--- /dev/null
+++ b/main.cpp
@@ -0,0 +1,14 @@
+#include <stdint.h>
+#include <stdio.h>
+#include <z80.h>
+
+uint8_t memory[65536];
+
+int main(int argc, char *argv[])
+{
+    FILE* f = fopen("48.rom", "rb");
+    fread(memory, 1024, 48, f);
+    fclose(f);
+    
+    set_memory(memory);
+}
\ No newline at end of file
diff --git a/z80.cpp b/z80.cpp
new file mode 100644
index 0000000..ed704e0
--- /dev/null
+++ b/z80.cpp
@@ -0,0 +1,256 @@
+#include "z80.h"
+
+namespace z80
+{
+    static uint8_t *memory = nullptr;
+    static uint32_t t_states = 0;
+
+    #define fC 0b00000001
+    #define fN 0b00000010
+    #define fP 0b00000100
+    #define fV 0b00000100
+    #define fX 0b00001000
+    #define fH 0b00010000
+    #define fY 0b00100000
+    #define fZ 0b01000000
+    #define fS 0b10000000
+
+    #define cNO -1
+    #define cNZ 0
+    #define cZ  1
+    #define cNC 2
+    #define cC  3
+    #define cPO 4
+    #define cPE 5
+    #define cP  6
+    #define cM  7
+
+    uint8_t regs[28];
+
+    uint8_t *_rF = &regs[0];
+    uint8_t *_rA = &regs[1];
+    uint8_t *_rC = &regs[2];
+    uint8_t *_rB = &regs[3];
+    uint8_t *_rE = &regs[4];
+    uint8_t *_rD = &regs[5];
+    uint8_t *_rL = &regs[6];
+    uint8_t *_rH = &regs[7];
+
+    uint16_t *_rAF = (uint16_t*)&regs[0];
+    uint16_t *_rBC = (uint16_t*)&regs[2];
+    uint16_t *_rDE = (uint16_t*)&regs[4];
+    uint16_t *_rHL = (uint16_t*)&regs[6];
+
+    uint8_t *_rF2 = &regs[8];
+    uint8_t *_rA2 = &regs[9];
+    uint8_t *_rC2 = &regs[10];
+    uint8_t *_rB2 = &regs[11];
+    uint8_t *_rE2 = &regs[12];
+    uint8_t *_rD2 = &regs[13];
+    uint8_t *_rL2 = &regs[14];
+    uint8_t *_rH2 = &regs[15];
+
+    uint16_t *_rAF2 = (uint16_t*)&regs[8];
+    uint16_t *_rBC2 = (uint16_t*)&regs[10];
+    uint16_t *_rDE2 = (uint16_t*)&regs[12];
+    uint16_t *_rHL2 = (uint16_t*)&regs[14];
+
+    uint16_t *_rIX = (uint16_t*)&regs[16];
+    uint16_t *_rIY = (uint16_t*)&regs[18];
+    uint16_t *_rSP = (uint16_t*)&regs[20];
+
+    uint8_t *_rI = &regs[22];
+    uint8_t *_rR = &regs[23];
+
+    uint16_t *_rPC = (uint16_t*)&regs[24];
+
+    uint16_t *_rWZ = (uint16_t*)&regs[26];
+    uint8_t  *_rZ = (uint8_t*)&regs[26];
+    uint8_t  *_rW = (uint8_t*)&regs[27];
+
+    #define rA (*_rA)
+    #define rF (*_rF)
+    #define rB (*_rB)
+    #define rC (*_rC)
+    #define rD (*_rD)
+    #define rE (*_rE)
+    #define rH (*_rH)
+    #define rL (*_rL)
+    #define rW (*_rW)
+    #define rZ (*_rZ)
+
+    #define rAF (*_rAF)
+    #define rBC (*_rBC)
+    #define rDE (*_rDE)
+    #define rHL (*_rHL)
+    #define rWZ (*_rWZ)
+
+    #define rA2 (*_rA2)
+    #define rF2 (*_rF2)
+    #define rB2 (*_rB2)
+    #define rC2 (*_rC2)
+    #define rD2 (*_rD2)
+    #define rE2 (*_rE2)
+    #define rH2 (*_rH2)
+    #define rL2 (*_rL2)
+
+    #define rAF2 (*_rAF2)
+    #define rBC2 (*_rBC2)
+    #define rDE2 (*_rDE2)
+    #define rHL2 (*_rHL2)
+
+    #define rIX (*_rIX)
+    #define rIY (*_rIY)
+    #define rSP (*_rSP)
+
+    #define rI (*_rI)
+    #define rR (*_rR)
+
+    #define rPC (*_rPC)
+
+    #define SWAP(a,b) {auto temp=a;a=b;b=temp;}
+
+    uint16_t LD16()
+    {
+        return memory[rPC++] + memory[rPC++] << 8;
+    }
+
+    uint16_t LD8()
+    {
+        return memory[rPC++];
+    }
+
+    void INC16(uint16_t *reg)
+    {
+        reg++;
+    }
+
+    void DEC16(uint16_t *reg)
+    {
+        reg--;
+    }
+
+    void INC8(uint8_t *reg)
+    {
+        reg++;
+    }
+
+    void DEC8(uint8_t *reg)
+    {
+        reg--;
+    }
+
+    void RLCA()
+    {
+        // [TODO]
+    }
+
+    void RRCA()
+    {
+        // [TODO]
+    }
+
+    void RLA()
+    {
+        // [TODO]
+    }
+
+    void RRA()
+    {
+        // [TODO]
+    }
+
+    void DAA()
+    {
+        // [TODO]
+    }
+
+    void CPL()
+    {
+        // [TODO]
+    }
+
+    void ADD16(uint16_t* a, uint16_t b)
+    {
+        *a = *a + b;
+    }
+
+    void DJNZ()
+    {
+        // [TODO]
+    }
+
+    void JR(uint8_t cond, int8_t disp)
+    {
+        // [TODO]
+    }
+
+    void reset(uint8_t* mem)
+    {
+        memory = mem;
+        rPC = 0;
+        t_states = 0;
+    }
+
+    void step()
+    {
+        const uint8_t opcode = memory[rPC++];
+        t_states+=4;
+        uint16_t tmp;
+
+        switch (opcode)
+        {
+            case 0x00: /* NOP */                        break;
+            case 0x01: rBC = LD16();                    break;
+            case 0x02: memory[rBC] = rA;                break;
+            case 0x03: INC16(_rBC);                     break;
+            case 0x04: INC8(_rB);                       break;
+            case 0x05: DEC8(_rB);                       break;
+            case 0x06: rB = LD8();                      break;
+            case 0x07: RLCA();                          break;
+            case 0x08: SWAP(rAF, rAF2);                 break;
+            case 0x09: ADD16(_rHL, rBC);                break;
+            case 0x0A: rA = memory[rBC];                break;
+            case 0x0B: DEC16(_rBC);                     break;
+            case 0x0C: INC8(_rC);                       break;
+            case 0x0D: DEC8(_rC);                       break;
+            case 0x0E: rC = LD8();                      break;
+            case 0x0F: RRCA();                          break;
+
+            case 0x10: DJNZ();                          break;
+            case 0x11: rDE = LD16();                    break;
+            case 0x12: memory[rDE] = rA;                break;
+            case 0x13: INC16(_rDE);                     break;
+            case 0x14: INC8(_rD);                       break;
+            case 0x15: DEC8(_rD);                       break;
+            case 0x16: rD = LD8();                      break;
+            case 0x17: RLA();                           break;
+            case 0x18: JR(cNO, int8_t(rD));             break;
+            case 0x19: ADD16(_rHL, rDE);                break;
+            case 0x1A: rA = memory[rDE];                break;
+            case 0x1B: DEC16(_rDE);                     break;
+            case 0x1C: INC8(_rE);                       break;
+            case 0x1D: DEC8(_rE);                       break;
+            case 0x1E: rE = LD8();                      break;
+            case 0x1F: RRA();                           break;
+
+            case 0x20: JR(cNZ, int8_t(rD));             break;
+            case 0x21: rHL = LD16();                    break;
+            case 0x22: tmp=LD16(); memory[tmp] = rL; memory[tmp+1] = rH; break;
+            case 0x23: INC16(_rHL);                     break;
+            case 0x24: INC8(_rH);                       break;
+            case 0x25: DEC8(_rH);                       break;
+            case 0x26: rH = LD8();                      break;
+            case 0x27: DAA();                           break;
+            case 0x28: JR(cZ, int8_t(rD));              break;
+            case 0x29: ADD16(_rHL, rHL);                break;
+            case 0x2A: tmp=LD16(); rL = memory[tmp]; rH = memory[tmp+1]; break;
+            case 0x2B: DEC16(_rHL);                     break;
+            case 0x2C: INC8(_rL);                       break;
+            case 0x2D: DEC8(_rL);                       break;
+            case 0x2E: rL = LD8();                      break;
+            case 0x2F: CPL();                           break;
+
+        }
+    }
+}
\ No newline at end of file
diff --git a/z80.h b/z80.h
new file mode 100644
index 0000000..ad0f3d5
--- /dev/null
+++ b/z80.h
@@ -0,0 +1,9 @@
+#pragma once
+
+#include <stdint.h>
+
+namespace z80
+{
+    void reset(uint8_t* mem);
+    void step();
+}
\ No newline at end of file