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global _start
%define True 1
%define False 0
%define r1 rax
%define r2 rcx
%define r3 rdx
%define r5 rbp
%define stdin 0
%define stdout 1
%define BUFFER_SIZE 4096
%macro pushdata 1
push r1
push r5
mov r5, [data_stack_length]
;; In case we want to do this with a constant or address
mov r1, %1
mov [data_stack + 8*r5], r1
inc qword [data_stack_length]
pop r5
pop r1
%endmacro
%macro popdata 1
push r5
dec qword [data_stack_length]
mov r5, [data_stack_length]
mov %1, [data_stack + 8*r5]
pop r5
%endmacro
%macro prints 1+
jmp %%endstr
%%str: db %1
%%endstr:
mov eax, 1
mov rdi, stdout
lea rsi, [%%str]
mov rdx, %%endstr-%%str
syscall
%endmacro
section .data
eol: db 10
space: db 32
print_chars: db "0123456789abcdef"
;; primitive_function: dq push1, print, return
memory: dq 0, 1, 0, 1, 2
section .bss
call_stack_length: resq 1
call_stack: resq 10000
data_stack_length: resq 1
data_stack: resq 10000
input_buffer_length: resq 1
input_buffer: resb 10000
input_buffer_counter: resq 1
section .text
_start:
call read_stdin
call read_stdin
call read_stdin
exit:
mov eax, 60
mov rdi, 0
syscall
read_stdin:
prints "> "
mov eax, 0
mov rdi, stdin
lea rsi, [input_buffer]
mov rdx, BUFFER_SIZE
syscall
cmp r1, 0
je .read_error
mov qword [input_buffer_length], r1
pushdata r1
mov qword [input_buffer_counter], 0
prints "# char read: "
call print
call printeol
ret
.read_error:
prints "Out of input", 10
call exit
print:
;; Print value at the top of the stack as an integer in hex.
;; Callable without losing register values
push qword rax
push qword rcx
push qword rdx
push qword rbx
push qword rbp
push qword rsi
push qword rdi
;; x = data_stack.pop()
popdata r3
mov r1, 8
dec r1
.loop8times:
;; sys.print(stdout, print_chars[x & 1111b], 1)
mov r2, r3
and r2, 1111b
push qword r1
push qword r3
mov eax, 1
mov rdi, stdout
lea rsi, [print_chars + 1*r2]
mov rdx, 1
syscall
pop r3
pop r1
;; x >>= 4
shr r3, 4
dec r1
jns .loop8times
mov eax, 1
mov rdi, stdout
lea rsi, [space]
mov rdx, 1
syscall
pop rdi
pop rsi
pop rbp
pop rbx
pop rdx
pop rcx
pop rax
ret
printeol:
mov eax, 1
mov rdi, stdout
lea rsi, [eol]
mov rdx, 1
syscall
ret
printspace:
mov eax, 1
mov rdi, stdout
lea rsi, [space]
mov rdx, 1
syscall
ret