update freestanding study

2025-12-30 17:28:02 +09:00
parent 8f1a81b699
commit 33c5e8bfb6
4 changed files with 22 additions and 0 deletions
@@ -0,0 +1,2 @@
+free
+*.o
@@ -0,0 +1,3 @@
+#!/bin/sh
+
+g++ -m32 -c -o free.o free.cpp -ffreestanding && ld -m elf_i386 -o free free.o
@@ -0,0 +1,7 @@
+extern "C" void _start() {
+    asm volatile (
+        "mov $1, %eax\n" 
+        "mov $0, %ebx\n" 
+        "int $0x80" 
+    );
+}
@@ -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
+```