assembly/disassembly stuff
This commit is contained in:
parent
d0b7670eca
commit
ead5f8c370
199
source/app.d
199
source/app.d
|
|
@ -346,12 +346,181 @@ struct PixelBuffer {
|
|||
|
||||
} // PixelBuffer
|
||||
|
||||
struct Assembler {
|
||||
|
||||
enum OpCode {
|
||||
|
||||
CLS, // CLS
|
||||
|
||||
RET, // RET
|
||||
CALL, // CALL addr
|
||||
|
||||
ADD, // ADD Vx, Vy
|
||||
// ADD Vx, byte
|
||||
// ADD I, Vx
|
||||
SUB, // SUB Vx, Vy
|
||||
// SUB Vx, byte
|
||||
SUBN, // SUBN Vx, Vy
|
||||
|
||||
SE, // SE Vx, Vy
|
||||
// SE Vx, byte
|
||||
SNE, // SNE Vx, byte
|
||||
SKP, // SKP Vx
|
||||
SKNP, // SKNP Vx
|
||||
|
||||
SHL, // SHL Vx {, Vy}
|
||||
SHR, // SHR Vx {, Vy}
|
||||
XOR, // XOR Vx, Vy
|
||||
AND, // AND Vx, Vy
|
||||
OR, // OR Vx, Vy
|
||||
|
||||
LD, // LD Vx, DT
|
||||
// LD DT, Vx
|
||||
// LD ST, Vx
|
||||
// LD Vx, K
|
||||
// LD [I], Vx
|
||||
// LD Vx, [I]
|
||||
|
||||
RND // RND Vx, byte
|
||||
|
||||
}
|
||||
|
||||
enum Parameter {
|
||||
|
||||
Vx,
|
||||
Vy,
|
||||
|
||||
DT,
|
||||
ST,
|
||||
K,
|
||||
|
||||
addr,
|
||||
val
|
||||
|
||||
}
|
||||
|
||||
struct Instruction {
|
||||
|
||||
}
|
||||
|
||||
import std.array;
|
||||
|
||||
Appender!string dissassembly_data;
|
||||
|
||||
void assemble(const char* input) {
|
||||
|
||||
} // assemble
|
||||
|
||||
void assemble(const char[] input) {
|
||||
|
||||
} // assemble
|
||||
|
||||
const (char)[] disassemble(ubyte[] instructions) {
|
||||
|
||||
import std.range : chunks;
|
||||
|
||||
foreach (ref ubyte[] i; instructions.chunks(2)) {
|
||||
|
||||
ushort opcode = (*(cast(ushort*)(i.ptr)));
|
||||
|
||||
switch (opcode & 0xF000) {
|
||||
case 0x0000:
|
||||
switch (opcode & 0x0FFF) {
|
||||
case 0x00E0: // 0x00E0 Clears the screen.
|
||||
|
||||
case 0x00EE: // 0x00EE Returns from a subroutine.
|
||||
default: // 0x0NNN Calls RCA 1802 program at address NNN. Not necessary for most ROMs.
|
||||
//assert(0, "0x0NNN RCA 1802 program opcode not implemented!");
|
||||
break;
|
||||
}
|
||||
break;
|
||||
case 0x1000: // 0x1NNN Jumps to address NNN.
|
||||
case 0x2000: // 0x2NNN Calls subroutine at NNN.
|
||||
case 0x3000: // 0x3XNN Skips the next instruction if VX equals NN.
|
||||
case 0x4000: // 0x4XNN Skips the next instruction if VX doesn't equal NN.
|
||||
case 0x5000: // 0x5XYO Skips the next instruction if VX equals VY.
|
||||
case 0x6000: // 0x6XNN Sets VX to NN.
|
||||
case 0x7000: // 0x7XNN Adds NN to VX.
|
||||
case 0x8000:
|
||||
switch (opcode) {
|
||||
|
||||
case 0x0000: // 0x8XY0 Sets VX to the value of VY.
|
||||
case 0x0001: // 0x8XY1 Sets VX to VX or VY.
|
||||
case 0x0002: // 0x8XY2 Sets VX to VX and VY.
|
||||
case 0x0003: // 0x8XY3 Sets VX to VX xor VY.
|
||||
case 0x0004: // 0x8XY4 Adds VY to VX. VF is set to 1 when there's a carry, and to 0 when there isn't.
|
||||
case 0x0005: // 0x8XY5 VY is subtracted from VX. VF is set to 0 when there's a borrow, and 1 when there isn't.
|
||||
case 0x0006: // 0x8XY6 Shifts VX right by one. VF is set to the value of the least significant bit of VX before the shift.
|
||||
case 0x0007: // 0x8XY7 Sets VX to VY minus VX. VF is set to 0 when there's a borrow, and 1 when there isn't.
|
||||
case 0x000E: // 0x8XYE Shifts VX left by one. VF is set to the value of the most significant bit of VX before the shift.
|
||||
default: // unhandled for some reason
|
||||
writefln("unknown opcode: 0x%x", opcode);
|
||||
break;
|
||||
|
||||
}
|
||||
|
||||
break;
|
||||
|
||||
case 0x9000: // 0x9XYO Skips the next instruction if VX doesn't equal VY.
|
||||
case 0xA000: // 0xANNN Sets I to the address NNN.
|
||||
case 0xB000: // 0xBNNN Jumps to the address NNN plus V0.
|
||||
case 0xC000: // 0xCXNN Sets VX to the result of a bitwise and operation on a random number and NN.
|
||||
|
||||
// 0xDXYN
|
||||
// Sprites stored in memory at location in index register (I), 8bits wide.
|
||||
// Wraps around the screen. If when drawn, clears a pixel, register VF is set to 1 otherwise it is zero.
|
||||
// All drawing is XOR drawing (i.e. it toggles the screen pixels).
|
||||
// Sprites are drawn starting at position VX, VY. N is the number of 8bit rows that need to be drawn.
|
||||
// If N is greater than 1, second line continues at position VX, VY+1, and so on.
|
||||
case 0xD000:
|
||||
case 0xE000:
|
||||
switch (opcode & 0x000F) {
|
||||
case 0x000E: // 0xEX9E Skips the next instruction if the key stored in VX is pressed.
|
||||
case 0x0001: // 0xEXA1 Skips the next instruction if the key stored in VX isn't pressed.
|
||||
default: //unhandled for some reason
|
||||
writefln("unknown opcode: 0x%x", opcode);
|
||||
break;
|
||||
}
|
||||
break;
|
||||
case 0xF000:
|
||||
switch (opcode & 0x00FF) {
|
||||
case 0x0007: // 0xFX07 Sets VX to the value of the delay timer.
|
||||
case 0x000A: // 0xFX0A A key press is awaited, and then stored in VX.
|
||||
case 0x0015: // 0xFX15 Sets the delay timer to VX.
|
||||
case 0x0018: // 0xFX18 Sets the sound timer to VX.
|
||||
case 0x001E: // 0xFX1E Adds VX to I.
|
||||
case 0x0029: // 0xFX29 Sets I to the location of the sprite for the character in VX.
|
||||
// 0xFX33 Stores the Binary-coded decimal representation of VX,
|
||||
// with the most significant of three digits at the address in I,
|
||||
// the middle digit at I plus 1, and the least significant digit at I plus 2.
|
||||
case 0x0033:
|
||||
case 0x0055: // 0xFX55 Stores V0 to VX in memory starting at address I.
|
||||
case 0x0065: // 0xFX65 Fills V0 to VX with values from memory starting at address I.
|
||||
default: // unhandled for some reason
|
||||
writefln("unknown opcode: 0x%x", opcode);
|
||||
break;
|
||||
}
|
||||
break;
|
||||
default:
|
||||
writefln("unknown opcode: 0x%x", opcode);
|
||||
}
|
||||
}
|
||||
|
||||
return "";
|
||||
|
||||
} // dissassemble
|
||||
|
||||
} // Assembler
|
||||
|
||||
struct Chip8Status {
|
||||
|
||||
//emu ptr
|
||||
// emu ptr
|
||||
Emulator* run_;
|
||||
Chip8* emu_;
|
||||
|
||||
// loaded program
|
||||
const (char)* loaded_program;
|
||||
|
||||
// mem editor
|
||||
// MemoryEditor mem_editor_;
|
||||
|
||||
|
|
@ -389,6 +558,8 @@ struct Chip8Status {
|
|||
|
||||
void resetShortcut() {
|
||||
|
||||
loaded_program = null;
|
||||
|
||||
emu_.reset();
|
||||
|
||||
} // resetShortcut
|
||||
|
|
@ -397,6 +568,7 @@ struct Chip8Status {
|
|||
|
||||
import std.file : read;
|
||||
|
||||
loaded_program = "chip8_picture.ch8";
|
||||
auto buf = read("programs/chip8_picture.ch8");
|
||||
emu_.load(0x200, buf); // do ze load yes, will copy all the data in
|
||||
|
||||
|
|
@ -463,14 +635,19 @@ struct Chip8Status {
|
|||
igBegin("Emulator Status");
|
||||
|
||||
igBeginChild("General");
|
||||
igText("OpCode: 0x%04X", emu_.cpu.opcode);
|
||||
igText("PC:");
|
||||
if (!loaded_program) {
|
||||
igText("Loaded Program: none");
|
||||
} else {
|
||||
igText("Loaded Program: %s", loaded_program);
|
||||
}
|
||||
igText("Opcode: 0x%04X", emu_.cpu.opcode);
|
||||
igSameLine();
|
||||
igText("pc: 0x%04X (%hu)", emu_.cpu.pc, emu_.cpu.pc);
|
||||
igText("| PC: 0x%04X (%hu)", emu_.cpu.pc, emu_.cpu.pc);
|
||||
// igDragInt("##pc", cast(int*)&emu_.cpu.pc, 0.5f, 0, emu_.ram.length);
|
||||
|
||||
igText("Registers (v0 - vF)");
|
||||
igColumns(4, null, false);
|
||||
igIndent();
|
||||
|
||||
auto n = 0;
|
||||
foreach (ref chunk; emu_.cpu.v[].chunks(4)) {
|
||||
|
|
@ -483,12 +660,24 @@ struct Chip8Status {
|
|||
}
|
||||
|
||||
igColumns(1, null, false);
|
||||
igUnindent();
|
||||
|
||||
igText("Index Register: 0x%04X", emu_.cpu.i);
|
||||
igText("Delay Timer: 0x%04X", emu_.cpu.delay_timer);
|
||||
igText("Sound Timer: 0x%04X", emu_.cpu.sound_timer);
|
||||
|
||||
if(igButton("Step")) {
|
||||
if (igButton("Reload")) {
|
||||
resetShortcut();
|
||||
loadShortcut();
|
||||
}
|
||||
|
||||
igSameLine();
|
||||
|
||||
if (igButton("Reset")) {
|
||||
resetShortcut();
|
||||
}
|
||||
|
||||
if (igButton("Step")) {
|
||||
emu_.step();
|
||||
}
|
||||
|
||||
|
|
|
|||
Loading…
Reference in New Issue