From cd55c3a57fea32c6709e808fe8e35e9bbf85c847 Mon Sep 17 00:00:00 2001
From: Jan-Erik Rediger <janerik@rediger.net>
Date: Fri, 15 Sep 2023 11:11:51 +0000
Subject: [PATCH] init

---
 .gitignore   |  1 +
 Makefile     |  8 ++++++++
 flake.lock   | 25 +++++++++++++++++++++++++
 flake.nix    | 25 +++++++++++++++++++++++++
 template.asm |  6 ++++++
 5 files changed, 65 insertions(+)
 create mode 100644 .gitignore
 create mode 100644 Makefile
 create mode 100644 flake.lock
 create mode 100644 flake.nix
 create mode 100644 template.asm

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..b981212
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+0x??
diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..c02fd88
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,8 @@
+%.o: %.asm
+	nasm -felf64 $<
+%: %.o
+	gcc -z noexecstack -o $@ $<
+
+template:
+	@echo "Copy template.asm to \$$name.asm and run \`make \$$name\`"
+.PHONY: template
diff --git a/flake.lock b/flake.lock
new file mode 100644
index 0000000..a846bc8
--- /dev/null
+++ b/flake.lock
@@ -0,0 +1,25 @@
+{
+  "nodes": {
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1694593561,
+        "narHash": "sha256-WSaIQZ5s9N9bDFkEMTw6P9eaZ9bv39ZhsiW12GtTNM0=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "1697b7d480449b01111e352021f46e5879e47643",
+        "type": "github"
+      },
+      "original": {
+        "id": "nixpkgs",
+        "type": "indirect"
+      }
+    },
+    "root": {
+      "inputs": {
+        "nixpkgs": "nixpkgs"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}
diff --git a/flake.nix b/flake.nix
new file mode 100644
index 0000000..5111ddb
--- /dev/null
+++ b/flake.nix
@@ -0,0 +1,25 @@
+{
+  description = "xchg rax, rax";
+
+  outputs = { self, nixpkgs, ... }:
+    let
+      supportedSystems = [ "x86_64-linux" ];
+      forAllSystems = nixpkgs.lib.genAttrs supportedSystems;
+    in
+    {
+      devShells = forAllSystems (system:
+        let
+          pkgs = nixpkgs.legacyPackages.${system};
+        in
+        {
+          default = pkgs.mkShell {
+            buildInputs = with pkgs;
+              [
+                gdb
+                gnumake
+                nasm
+              ];
+          };
+        });
+    };
+}
diff --git a/template.asm b/template.asm
new file mode 100644
index 0000000..8f4d019
--- /dev/null
+++ b/template.asm
@@ -0,0 +1,6 @@
+	BITS 64
+	SECTION .text
+	global main
+
+main:
+	xor eax, eax