From 806d87e0f1acdd0b3ebecf22d03ae1d1569f01d9 Mon Sep 17 00:00:00 2001
From: Paul Mathieu <paul@ponteilla.net>
Date: Wed, 1 Oct 2025 23:22:08 +0200
Subject: [PATCH] Get rid of crt0.c

---
 Makefile |  4 ++--
 crc16.s  |  5 +++++
 crt0.c   | 25 -------------------------
 3 files changed, 7 insertions(+), 27 deletions(-)
 delete mode 100644 crt0.c

diff --git a/Makefile b/Makefile
index 7b60160..597d503 100644
--- a/Makefile
+++ b/Makefile
@@ -6,8 +6,8 @@ dev-image = 5150-dev
 crc16.s: crc16.c
 	ia16-elf-gcc -S -Os -o crc16.s crc16.c
 
-crc16.bin: crc16.s crt0.c
-	ia16-elf-gcc -o crc16.bin -Os -nostdlib crc16.s crt0.c
+crc16.bin: crc16.s
+	ia16-elf-gcc -o crc16.bin -Os -nostdlib crc16.s
 
 CC = ia16-elf-gcc
 CXX = ia16-elf-gcc
diff --git a/crc16.s b/crc16.s
index 16f446d..5ac8d68 100644
--- a/crc16.s
+++ b/crc16.s
@@ -3,6 +3,11 @@
 	.att_syntax prefix
 #NO_APP
 #APP
+    .section .text.init
+    .global _start
+_start:
+
+    .section .text.main
 	.global main      
 main:             
   push %bp        
diff --git a/crt0.c b/crt0.c
deleted file mode 100644
index 43f40b8..0000000
--- a/crt0.c
+++ /dev/null
@@ -1,25 +0,0 @@
-#include <stdint.h>
-#include <string.h>
-
-int main();
-
-asm(".section .init     \n"
-    ".global _start     \n"
-    "_start:            \n\t"
-    "mov %cs, %ax       \n\t"
-    "mov %ax, %ds       \n\t"
-    "mov %ax, %es       \n\t"
-    "cli                \n\t"
-    "mov %ax, %ss       \n\t"
-    "mov $0x1000, %ax   \n\t"
-    "mov %ax, %sp       \n\t"
-    "sti                \n\t"
-    "jmp main");
-
-void* memset(void* ptr, int val, size_t len) {
-    uint8_t* p = ptr;
-    while (len--) {
-        *p++ = val;
-    }
-    return ptr;
-}