From 33c5e8bfb6f521d2657c5c57c5861cbcb252483d Mon Sep 17 00:00:00 2001
From: Minseong Gwak <gmspweber@postech.ac.kr>
Date: Tue, 30 Dec 2025 17:28:02 +0900
Subject: [PATCH] update freestanding study

---
 free/.gitignore |  2 ++
 free/build.sh   |  3 +++
 free/free.cpp   |  7 +++++++
 free/readme.md  | 10 ++++++++++
 4 files changed, 22 insertions(+)
 create mode 100644 free/.gitignore
 create mode 100755 free/build.sh
 create mode 100644 free/free.cpp
 create mode 100644 free/readme.md

diff --git a/free/.gitignore b/free/.gitignore
new file mode 100644
index 0000000..70ffe74
--- /dev/null
+++ b/free/.gitignore
@@ -0,0 +1,2 @@
+free
+*.o
diff --git a/free/build.sh b/free/build.sh
new file mode 100755
index 0000000..1710f48
--- /dev/null
+++ b/free/build.sh
@@ -0,0 +1,3 @@
+#!/bin/sh
+
+g++ -m32 -c -o free.o free.cpp -ffreestanding && ld -m elf_i386 -o free free.o
diff --git a/free/free.cpp b/free/free.cpp
new file mode 100644
index 0000000..46d6cb2
--- /dev/null
+++ b/free/free.cpp
@@ -0,0 +1,7 @@
+extern "C" void _start() {
+    asm volatile (
+        "mov $1, %eax\n" 
+        "mov $0, %ebx\n" 
+        "int $0x80" 
+    );
+}
\ No newline at end of file
diff --git a/free/readme.md b/free/readme.md
new file mode 100644
index 0000000..c52c628
--- /dev/null
+++ b/free/readme.md
@@ -0,0 +1,10 @@
+# freestanding
+
+```bash
+g++ -c -o free.o free.cpp
+ld -o free free.o
+
+objdump -x free
+
+# g++ -c -nostdlib -o free free.cpp
+```