Replace absolute addresses with labels in entrypoint

edlin.asm

@@ -24,8 +24,8 @@ _trampoline_error_1:
 	jmp error
 
 entrypoint: ; 0181
-	mov byte [0x0a7f], 0
-	mov sp, 0x0d48
+	mov byte [__0a7f], 0
+	mov sp, stack_end
 
 ensure_file_argument:
 	db 0x82, 0x3e ; cmp byte […], byte +… (extended)
@@ -37,11 +37,11 @@ ensure_file_argument:
 	mov dx, invalid_name_error
 	jnz _trampoline_error_1
 
-db 0xBE, 0x3E, 0x09 ; 0197 mov si,0x93e
-db 0xBF, 0x65, 0x00 ; 019A mov di,0x65
-db 0xB9, 0x03, 0x00 ; 019D mov cx,0x3
-db 0xF3, 0xA6 ; 01A0 repe cmpsb
-db 0x74, 0x42 ; 01A2 jz 0x1e6
+	mov si, __093e
+	mov di, psp_fcb_1 + fcb_filename + 8
+	mov cx, 3
+	repe cmpsb
+	je __01e6
 db 0xB4, 0x0F ; 01A4 mov ah,0xf
 db 0xBA, 0x5C, 0x00 ; 01A6 mov dx,0x5c
 db 0xCD, 0x21 ; 01A9 int 0x21
@@ -72,6 +72,8 @@ db 0x0A, 0xC0 ; 01DC or al,al
 db 0x74, 0x0C ; 01DE jz 0x1ec
 db 0xBA, 0x9B, 0x09 ; 01E0 mov dx,0x99b
 db 0xE9, 0x96, 0x02 ; 01E3 jmp 0x47c
+
+__01e6:
 db 0xBA, 0x78, 0x09 ; 01E6 mov dx,0x978
 db 0xE9, 0x90, 0x02 ; 01E9 jmp 0x47c
 db 0x33, 0xC0 ; 01EC xor ax,ax
@@ -868,3 +870,9 @@ __0a1a db "O.K.? $"
 __0a21 db "Line too long", 13, 10, '$'
 __0a31 db "End of input file", 13, 10, '$'
 __0a45 db "Abort edit (Y/N)? $"
+
+; 0a58
+
+__0a7f equ 0x0a7f
+
+stack_end equ 0x0d48