From c8a0ffc4fb4bd06b043e24499467ae75d9d21fc4 Mon Sep 17 00:00:00 2001
From: neauoire <aliceffekt@gmail.com>
Date: Fri, 29 Jan 2021 11:35:59 -0800
Subject: [PATCH] *

---
 .clang-format | 19 +++++++++++++++++++
 .gitignore    |  6 ++++++
 README.md     | 49 +++++++++++++++++++++++++++++++++++++++++++++++++
 build.sh      |  0
 uxn.c         | 21 ++++++++++++++++++++-
 5 files changed, 94 insertions(+), 1 deletion(-)
 create mode 100644 .clang-format
 create mode 100644 .gitignore
 mode change 100644 => 100755 build.sh

diff --git a/.clang-format b/.clang-format
new file mode 100644
index 0000000..67c9a1b
--- /dev/null
+++ b/.clang-format
@@ -0,0 +1,19 @@
+AlignAfterOpenBracket: DontAlign
+AlignEscapedNewlines: DontAlign
+AllowShortBlocksOnASingleLine: Empty
+AllowShortCaseLabelsOnASingleLine: true
+AllowShortIfStatementsOnASingleLine: false
+AllowShortLoopsOnASingleLine: false
+AlwaysBreakAfterDefinitionReturnType: TopLevel
+BinPackArguments: false
+BinPackParameters: false
+BreakBeforeBraces: WebKit
+IndentCaseLabels: false
+TabWidth: 4
+IndentWidth: 4
+ContinuationIndentWidth: 4
+UseTab: ForContinuationAndIndentation
+ColumnLimit: 0
+ReflowComments: false
+SortIncludes: false
+SpaceBeforeParens: false
\ No newline at end of file
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..28b1921
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,6 @@
+.DS*
+*jpg~
+*png~
+*gif~
+*bmp~
+uxn
\ No newline at end of file
diff --git a/README.md b/README.md
index ddcc048..5eb2276 100644
--- a/README.md
+++ b/README.md
@@ -7,3 +7,52 @@ A stack-based VM, written in ANSI C.
 ```
 cc uxn.c -std=c89 -Os -DNDEBUG -g0 -s -Wall -Wno-unknown-pragmas -o uxn
 ```
+
+## OP Codes
+
+```
+VALUE       OPCODE  EXPLANATION
+0x00000000  NOP     do nothing
+0x00000001  ADD     pop a, pop b, push a + b
+0x00000002  SUB     pop a, pop b, push a - b
+0x00000003  AND     pop a, pop b, push a & b
+0x00000004  OR      pop a, pop b, push a | b
+0x00000005  XOR     pop a, pop b, push a ^ b
+0x00000006  NOT     pop a, push !a
+0x00000007  IN      read one byte from stdin, push as word on stack
+0x00000008  OUT     pop one word and write to stream as one byte
+0x00000009  LOAD    pop a, push word read from address a
+0x0000000A  STOR    pop a, pop b, write b to address a
+0x0000000B  JMP     pop a, goto a
+0x0000000C  JZ      pop a, pop b, if a == 0 goto b
+0x0000000D  PUSH    push next word
+0x0000000E  DUP     duplicate word on stack
+0x0000000F  SWAP    swap top two words on stack
+0x00000010  ROL3    rotate top three words on stack once left, (a b c) -> (b c a)
+0x00000011  OUTNUM  pop one word and write to stream as number
+0x00000012  JNZ     pop a, pop b, if a != 0 goto b
+0x00000013  DROP    remove top of stack
+0x00000014  PUSHIP  push a in IP stack
+0x00000015  POPIP   pop IP stack to current IP, effectively performing a jump
+0x00000016  DROPIP  pop IP, but do not jump
+0x00000017  COMPL   pop a, push the complement of a
+```
+
+## Design
+
+### CPU
+
+- Build stack with pointer
+- Print stack
+- Build memory
+
+### PPU
+
+### Assembler
+
+
+### Emulator
+
+- SDL Layer
+
+### Assembly
diff --git a/build.sh b/build.sh
old mode 100644
new mode 100755
diff --git a/uxn.c b/uxn.c
index 16ca6d5..dd11941 100644
--- a/uxn.c
+++ b/uxn.c
@@ -1,6 +1,6 @@
 #include <stdio.h>
 
-/* 
+/*
 Copyright (c) 2021 Devine Lu Linvega
 
 Permission to use, copy, modify, and distribute this software for any
@@ -11,9 +11,28 @@ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 WITH REGARD TO THIS SOFTWARE.
 */
 
+typedef unsigned char Uint8;
+#define STACK_DEPTH 256
+
+Uint8 data[STACK_DEPTH];
+Uint8 address[STACK_DEPTH];
+
+void
+stackprint(Uint8 *stack)
+{
+	int i;
+	for(i = 0; i < STACK_DEPTH; ++i) {
+		if(i % 16 == 0)
+			printf("\n");
+		printf("%02x ", stack[i]);
+	}
+	printf("\n");
+}
+
 int
 main(int argc, char *argv[])
 {
 	printf("hello\n");
+	stackprint(data);
 	return 0;
 }