在x86-64程序集中打印一个数字

Question

好的，我所要做的就是在Linux的x86-64程序集中打印一个数字（最大为18446744073709551616）。任何人都可以告诉我为什么这个程序不能工作？发生的只是它运行和退出。感谢您提供的所有帮助！

GLOBAL _start 
SECTION .text 

;PRINTCHAR 
; MOV [LETTER],RAX 
; 
; MOV RAX,1 
; MOV RDI,1 
; MOV RSI,LETTER 
; MOV RDX,1 
; SYSCALL 
; RET 

PRINTDEC: 
MOV R9,18   ;SO IT CAN POINT TO THE END OF THE BUFFER 
MOV R10,0 
START: 
MOV R8,NUMBER 
MOV RDX,0   ;CLEAR OUT RDX TO AVOID ERRORS 
MOV RBX,10   ;WHAT TO DIVIDE BY 

DIV RBX   ;DIVIDE OUR NUMBER BY TEN 

CMP RAX,0   ;IF OUR QUOTENT IS ZERO THEN WE ARE DONE, PRINT THE BUFFER 
JE END 
JMP ADDBUF 

ADDBUF: 
    ADD R8,R9   ;MOV TO THE CURRENT LOCATION IN OUR BUFFER 
    ADD RDX,0x30 
; ADD R8,R10 
    MOV [R8],RDX  ;MOV THE LAST NUMBER IN OUR BUFFER TO RDX 
    DEC R9 
    INC R10 
    JMP START 

END: 

ADD R8,R9   ;add the very last digit 
MOV [R8],RDX 
INC R10 

MOV RAX,1 
MOV RDI,1 
MOV RSI,R8 
MOV RDX,R10 
SYSCALL 

RET 

_start: 
MOV RAX,55 
CALL PRINTDEC 

MOV RAX,60 
MOV RDI,0 
SYSCALL 

SECTION .bss 
LETTER: RESB 1 
NUMBER: RESB 19 

Answer 1

PRINTDEC: 
LEA R9, [NUMBER + 18] ; last character of buffer 
MOV R10, R9   ; copy the last character address 
MOV RBX, 10   ; base10 divisor 

DIV_BY_10: 

XOR RDX, RDX   ; zero rdx for div 
DIV RBX   ; rax:rdx = rax/rbx 
ADD RDX, 0x30  ; convert binary digit to ascii 
TEST RAX,RAX   ; if rax == 0 exit DIV_BY_10 
JZ LAST_REMAINDER 
MOV byte [R9], DL  ; save remainder 
SUB R9, 1    ; decrement the buffer address 
JMP DIV_BY_10 

LAST_REMAINDER: 

TEST DL, DL  ; if DL (last remainder) != 0 add it to the buffer 
JZ CHECK_BUFFER 
MOV byte [R9], DL  ; save remainder 
SUB R9, 1    ; decrement the buffer address 

CHECK_BUFFER: 

CMP R9, R10  ; if the buffer has data print it 
JNE PRINT_BUFFER 
MOV byte [R9], '0' ; place the default zero into the empty buffer 
SUB R9, 1 

PRINT_BUFFER: 

ADD R9, 1   ; address of last digit saved to buffer 
SUB R10, R9  ; end address minus start address 
ADD R10, 1   ; R10 = length of number 
MOV RAX, 1   ; NR_write 
MOV RDI, 1   ;  stdout 
MOV RSI, R9  ;  number buffer address 
MOV RDX, R10  ;  string length 
SYSCALL 

RET