neauoire authored on 29/01/2021 19:35:59
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+AlignAfterOpenBracket: DontAlign |
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+AlignEscapedNewlines: DontAlign |
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+AllowShortBlocksOnASingleLine: Empty |
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+AllowShortCaseLabelsOnASingleLine: true |
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+AllowShortIfStatementsOnASingleLine: false |
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+AllowShortLoopsOnASingleLine: false |
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+AlwaysBreakAfterDefinitionReturnType: TopLevel |
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+BinPackArguments: false |
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+BinPackParameters: false |
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+BreakBeforeBraces: WebKit |
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+IndentCaseLabels: false |
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+TabWidth: 4 |
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+IndentWidth: 4 |
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+ContinuationIndentWidth: 4 |
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+UseTab: ForContinuationAndIndentation |
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+ColumnLimit: 0 |
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+ReflowComments: false |
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+SortIncludes: false |
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+SpaceBeforeParens: false |
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\ No newline at end of file |
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@@ -7,3 +7,52 @@ A stack-based VM, written in ANSI C. |
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``` |
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cc uxn.c -std=c89 -Os -DNDEBUG -g0 -s -Wall -Wno-unknown-pragmas -o uxn |
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``` |
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+ |
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+## OP Codes |
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+ |
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+``` |
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+VALUE OPCODE EXPLANATION |
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+0x00000000 NOP do nothing |
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+0x00000001 ADD pop a, pop b, push a + b |
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+0x00000002 SUB pop a, pop b, push a - b |
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+0x00000003 AND pop a, pop b, push a & b |
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+0x00000004 OR pop a, pop b, push a | b |
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+0x00000005 XOR pop a, pop b, push a ^ b |
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+0x00000006 NOT pop a, push !a |
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+0x00000007 IN read one byte from stdin, push as word on stack |
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+0x00000008 OUT pop one word and write to stream as one byte |
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+0x00000009 LOAD pop a, push word read from address a |
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+0x0000000A STOR pop a, pop b, write b to address a |
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+0x0000000B JMP pop a, goto a |
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+0x0000000C JZ pop a, pop b, if a == 0 goto b |
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+0x0000000D PUSH push next word |
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+0x0000000E DUP duplicate word on stack |
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+0x0000000F SWAP swap top two words on stack |
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+0x00000010 ROL3 rotate top three words on stack once left, (a b c) -> (b c a) |
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+0x00000011 OUTNUM pop one word and write to stream as number |
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+0x00000012 JNZ pop a, pop b, if a != 0 goto b |
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+0x00000013 DROP remove top of stack |
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+0x00000014 PUSHIP push a in IP stack |
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+0x00000015 POPIP pop IP stack to current IP, effectively performing a jump |
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+0x00000016 DROPIP pop IP, but do not jump |
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+0x00000017 COMPL pop a, push the complement of a |
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+``` |
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+ |
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+## Design |
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+ |
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+### CPU |
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+ |
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+- Build stack with pointer |
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+- Print stack |
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+- Build memory |
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+ |
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+### PPU |
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+ |
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+### Assembler |
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+ |
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+ |
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+### Emulator |
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+ |
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+- SDL Layer |
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+ |
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+### Assembly |
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@@ -1,6 +1,6 @@ |
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#include <stdio.h> |
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-/* |
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+/* |
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Copyright (c) 2021 Devine Lu Linvega |
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Permission to use, copy, modify, and distribute this software for any |
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@@ -11,9 +11,28 @@ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES |
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WITH REGARD TO THIS SOFTWARE. |
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*/ |
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+typedef unsigned char Uint8; |
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+#define STACK_DEPTH 256 |
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+ |
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+Uint8 data[STACK_DEPTH]; |
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+Uint8 address[STACK_DEPTH]; |
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+ |
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+void |
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+stackprint(Uint8 *stack) |
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+{
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+ int i; |
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+ for(i = 0; i < STACK_DEPTH; ++i) {
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+ if(i % 16 == 0) |
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+ printf("\n");
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+ printf("%02x ", stack[i]);
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+ } |
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+ printf("\n");
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+} |
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+ |
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int |
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main(int argc, char *argv[]) |
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{
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printf("hello\n");
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+ stackprint(data); |
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return 0; |
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} |