Align stack in functions that use syscall

src/console.asm

@@ -60,16 +60,19 @@ section .text
 ;----- print (char* string) -----;
 ; return value: N/A
 print:
+	sub	rsp, 8
 	call	strlen
 	mov	rdx, rax
 	mov	rax, NR_write
 	mov	rsi, rdi
 	mov	rdi, FD_stdout
 	syscall
+	add	rsp, 8
 	ret
 ;----- puts (char* string) -----;
 ; return  value: N/A
 puts:
+	sub	rsp, 8
 	mov	r10, rdi
 	call	print
 	mov	rdi, r10
@@ -78,6 +81,7 @@ puts:
 	mov	rsi, bNL
 	mov	rdx, 1
 	syscall
+	add	rsp, 8
 	ret
 ;----- printf(const char* string, ...) -----;
 ; Currently only supports specifiers: %d, %c, %s, %%

src/core.asm

@@ -139,5 +139,6 @@ itoa:
 ;----- exit(int exit_code) -----;
 ; returns: nothing
 exit:
+	sub	rsp, 8
 	mov	rax, NR_exit
 	syscall

src/file.asm

@@ -1,4 +1,5 @@
 %include "src/constants.asm"
+
 extern	strlen
 
 section .rodata
@@ -17,6 +18,7 @@ section .text
 ;----- fopen(const char *filename, const char mode) -----;
 ; return value: pointer to file or value < 0 (neg errno) if file failed to open
 fopen:
+	sub	rsp, 8
 	cmp	sil, 'r'
 	je	.setMode_r
 	cmp	sil, 'w'
@@ -56,10 +58,12 @@ fopen:
 	syscall
 
 	.quit:
+	add	rsp, 8
 	ret
 ;----- fclose(FILE* fp) -----;
 ; return value: 0 on success, below 0 otherwise (neg errno)
 fclose:
+	sub	rsp, 8
 	cmp	rdi, 3
 	jl	.ebadf
 
@@ -71,11 +75,13 @@ fclose:
 	mov	rax, -9
 
 	.quit:
+	add	rsp, 8
 	ret
 ;----- fwrite(FILE* fp, char* str) -----;
 ; writes a string to opened file
 ; return value: amount of written characters on success, below 0 otherwise (neg errno)
 fwrite:
+	sub	rsp, 8
 	cmp	rdi, FD_stderr
 	jle	.ebadf
 
@@ -92,4 +98,5 @@ fwrite:
 	mov	rax, -9
 
 	.quit:
+	add	rsp, 8
 	ret