From b8fe2bd8a382baff234041d1c32f8a8fe679da3d Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Nicol=C3=A1s=20Ortega=20Froysa?=
 <nortega@themusicinnoise.net>
Date: Fri, 23 Feb 2018 17:56:05 +0100
Subject: [PATCH] kernel entry assembly code to avoid compiler anomalies.

---
 Makefile         | 5 +++--
 kernel_entry.asm | 4 ++++
 2 files changed, 7 insertions(+), 2 deletions(-)
 create mode 100644 kernel_entry.asm

diff --git a/Makefile b/Makefile
index 71806a0..3f9e2aa 100644
--- a/Makefile
+++ b/Makefile
@@ -9,12 +9,13 @@ LDFLAGS=-melf_i386 -Ttext 0x1000 --oformat binary
 basicos:
 	mkdir -p $(BIN)
 	$(ASM) boot_sect.asm $(AFLAGS) -o boot_sect.bin
+	$(ASM) kernel_entry.asm -f elf -o kernel_entry.o
 	$(CC) $(CFLAGS) -c kernel.c -o kernel.o
-	$(LD) $(LDFLAGS) -o kernel.bin kernel.o
+	$(LD) $(LDFLAGS) -o kernel.bin kernel_entry.o kernel.o
 	cat boot_sect.bin kernel.bin > $(BIN)/os-image
 
 
 .PHONY: clean
 
 clean:
-	rm *.bin *.o
+	rm -f *.bin *.o
diff --git a/kernel_entry.asm b/kernel_entry.asm
new file mode 100644
index 0000000..aa73e23
--- /dev/null
+++ b/kernel_entry.asm
@@ -0,0 +1,4 @@
+[bits 32]
+[extern main]       ; reference an external label
+	call main       ; call the main function of our kernel
+	jmp $           ; hang