Adding everything

helper.s

@@ -0,0 +1,131 @@
+.intel_syntax noprefix
+.data
+error_msg_closefd: .ascii "Cannot close STD IO!\n\0"
+error_msg_openfd_noexist: .ascii "The file does not exist or can't be opened!\n\0"
+code_max_size: .quad 65536
+max_size: .quad 16384
+
+.text
+
+# ===================
+#    Memory Allocs
+# ===================
+# rdi = address
+# rsi = size
+clear_heap_block:
+  xor rcx, rcx
+clear_heap_block_loop:
+  mov byte ptr [rdi+rcx], 0
+  inc rcx
+  cmp rcx, rsi
+  jle clear_heap_block_loop
+  ret 
+
+# rdi = size in octets
+brk_alloc:
+  push rbx
+  push r12
+  inc rdi      # so you get all of the requested space
+  mov rbx, rdi
+
+  mov rax, 12
+  xor rdi, rdi
+  syscall
+
+  mov rdi, rax  # To push brk
+  add rdi, rbx
+  mov r12, rax  # To return
+
+  # Pushed
+  mov rax, 12
+  syscall 
+
+  mov rax, r12
+  
+  # Gotta return
+  pop r12
+  pop rbx
+  ret
+
+
+# ===================
+#      File I/O
+# ===================
+# rdi = FD
+# rsi = char*
+# rdx = size
+read: 
+  push r11 # read uses r11
+  xor rax, rax
+  syscall
+  pop r11
+  ret
+
+# rdi = FD
+# rsi = char*
+write:
+  push r15
+  mov r15, rdi
+  mov rdi, rsi # no need to touch rsi
+  call count
+
+  mov rdx, rax # Lenght
+  mov rax, 1
+  mov rdi, r15
+
+  syscall
+  pop r15
+  ret
+
+# rdi = String to count
+count:
+  mov rax, rdi
+count_loop:
+  mov r8b, [rax]
+  inc rax
+  cmp r8b, 0
+  jnz count_loop
+  dec rax
+  sub rax, rdi
+  ret
+
+# ===================
+#    File Handling
+# ===================
+# rdi = Path
+open_fd:
+  mov rax, 2
+  xor rsi, rsi # RO
+  mov rdx, 644 
+  syscall
+  cmp rax, 0
+  jl error_out_open
+  ret
+
+# rdi = FD
+close_fd:
+  cmp rdi, 0
+  je error_out_close
+  mov rax, 3
+  syscall
+  ret 
+
+# ===================
+#    Exit & Errors
+# ===================
+# rdi = Exit code
+exit:
+  mov rax, 60
+  syscall
+
+error_out_close:
+  mov rdi, 1
+  mov rsi, offset error_msg_closefd
+  call write
+  call exit
+
+error_out_open:
+  mov rdi, 1
+  mov rsi, offset error_msg_openfd_noexist
+  call write
+  call exit