Enable debug info.

Makefile

@@ -5,12 +5,19 @@ CC=x86_64-elf-gcc
 run: image.bin
 	qemu-system-i386 -drive format=raw,file=$<
 
+debug-boot: image.bin mbr.elf
+	qemu-system-i386 -drive format=raw,file=$< -s -S &
+	x86_64-elf-gdb mbr.elf \
+		-ex "set architecture i386" \
+		-ex "target remote localhost:1234" \
+		-ex "break init_32bit" \
+		-ex "continue"
+
 debug: image.bin
 	qemu-system-i386 -drive format=raw,file=$< -s -S &
-	x86_64-elf-gdb \
+	x86_64-elf-gdb kernel.bin \
 		-ex "target remote localhost:1234" \
-		-ex "set architecture i8086" \
-		-ex "break *0x7c5d" \
+		-ex "break _start" \
 		-ex "continue"
 
 image.bin: mbr.bin kernel.bin
@@ -20,13 +27,16 @@ kernel.bin: kernel.o vga.o string.o drivers/ata.o
 	$(LD) -m elf_i386 -o $@ -Ttext 0x1000 $^
 
 %.o: %.c
-	$(CC) -m32 -ffreestanding -c $< -o $@
+	$(CC) -m32 -ffreestanding -c -g $< -o $@
 
 %.o: %.S
-	$(AS) $^ -o $@
+	$(AS) $^ -g -o $@
 
 mbr.bin: mbr.o
 	$(LD) -Ttext=0x7c00 --oformat=binary $^ -o $@
 
+mbr.elf: mbr.o
+	$(LD) -Ttext=0x7c00 $^ -o $@
+
 clean:
 	rm *.bin *.o