Added an editor program. It doesn't edit anything yet :/

Makefile

@@ -8,7 +8,7 @@ CFLAGS = -std=c17 -ffreestanding -fno-builtin -fno-stack-protector -fno-pie \
 
 SRC = ./src
 BUILD = ./build
-C_FILES = calc
+C_FILES = calc editor
 FONTS = testfont term16n
 
 .PHONY: os clean run
@@ -30,6 +30,7 @@ filesystem: bootloader kernel $(C_FILES) $(FONTS)
 	@dd if=$(BUILD)/testfont.bin  of=kern.iso bs=512 seek=60 conv=notrunc status=none
 	@dd if=$(SRC)/fs/test.txt     of=kern.iso bs=512 seek=64 conv=notrunc status=none
 	@dd if=$(BUILD)/calc.bin      of=kern.iso bs=512 seek=65 conv=notrunc status=none
+	@dd if=$(BUILD)/editor.bin    of=kern.iso bs=512 seek=71 conv=notrunc status=none
 
 $(BUILD):
 	@[ -d $(BUILD) ] || mkdir $(BUILD)

src/editor.c

@@ -0,0 +1,13 @@
+#include <stdio.h>
+
+__attribute__ ((section("entry")))
+int main(int argc, char** argv) {
+    if (argc < 2) {
+        printf("Usage: %s <file>\n", argv[0]);
+        return 1;
+    }
+
+    printf("%s\n", argv[1]);
+
+    return 0;
+}

src/editor.ld

@@ -0,0 +1,16 @@
+SECTIONS {
+    .text 0x400000 : {
+        *(entry);
+        *(.text*);
+    }
+    .data : {
+        *(.data*);
+    }
+    .rodata : {
+        *(.rodata*);
+    }
+    .bss : {
+        *(.bss*);
+    }
+}
+

src/filetable.asm

@@ -19,6 +19,7 @@ filetable:
     db "testfont",0,0,     "fnt",0,60,4
     db "test",0,0,0,0,0,0, "txt",0,64,1
     db "calc",0,0,0,0,0,0, "bin",0,65,6
+    db "editor",0,0,0,0,   "bin",0,71,10
 
 times 512-($-$$) db 0