commit c8a0ffc4fb4bd06b043e24499467ae75d9d21fc4
parent fc9d3c1845d5a1c17391493fa8763383d3743d1f
Author: neauoire <aliceffekt@gmail.com>
Date: Fri, 29 Jan 2021 11:35:59 -0800
*
Diffstat:
5 files changed, 96 insertions(+), 1 deletion(-)
diff --git a/.clang-format 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
@@ -0,0 +1,6 @@
+.DS*
+*jpg~
+*png~
+*gif~
+*bmp~
+uxn
+\ No newline at end of file
diff --git 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
diff --git 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;
}
