Get rid of gcc, adds exit()

constants.asm

@@ -3,6 +3,7 @@ section .rodata
 	global	NR_write
 	global	NR_open
 	global	NR_close
+	global	NR_exit
 	
 	global	EOS
 	global	NL
@@ -12,6 +13,7 @@ section .rodata
 	NR_write	equ	1
 	NR_open		equ	2
 	NR_close	equ	3
+	NR_exit		equ	60
 
 	;ascii
 	EOS		equ	0x0

core.asm

@@ -1,3 +1,4 @@
+extern	NR_exit
 extern	strclr
 
 section	.text
@@ -10,6 +11,7 @@ section	.text
 	global	tolower
 	global	toupper
 	global	itoa
+	global	exit
 
 ;----- min(int a, int b) -----;
 ; return value: lowest value
@@ -176,3 +178,8 @@ itoa:
 	pop	rax
 	leave
 	ret
+;----- exit(int exit_code) -----;
+; returns: nothing
+exit:
+	mov	rax, NR_exit
+	syscall

makefile

@@ -1,5 +1,5 @@
 tests: tests.o constants.o core.o console.o string.o file.o
-	gcc tests.o constants.o core.o console.o string.o file.o -o tests -no-pie -z noexecstack
+	ld tests.o constants.o core.o console.o string.o file.o -o tests -no-pie -z noexecstack
 tests.o: tests.asm
 	nasm tests.asm -f elf64 -l tests.lst -g -F dwarf
 constants.o: constants.asm

tests.asm

@@ -13,6 +13,7 @@ extern	isupper
 extern	tolower
 extern	toupper
 extern	itoa
+extern	exit
 ;console.asm
 extern	print
 extern	puts
@@ -177,8 +178,8 @@ section .bss
 	strBuff1	resb	32
 	strBuff2	resb	8
 section .text
-	global main
-main:
+	global _start
+_start:
 	push	rbp
 	mov	rbp, rsp
 
@@ -809,4 +810,5 @@ main:
 %ENDIF
 
 	leave
-	ret
+	mov	rdi, 0
+	call	exit