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我想學習彙編程序，並且被osx和nasm macho32用於將參數傳遞給函數所使用的方法有些困惑。dword和彙編程序中的'堆棧'有什麼區別
我正在按照Jeff Duntemann的書「Assembly Language Step By Step」進行操作，並且廣泛使用互聯網已將其更改爲在32位和64位的osx上運行。
所以與Linux版本，開始從書
section .data ; Section containing initialised data
EatMsg db "Eat at Joe's!",10
EatLen equ $-EatMsg
section .bss ; Section containing uninitialised data
section .text ; Section containing code
global start ; Linker needs this to find the entry point!
start:
nop
mov eax, 4 ; Specify sys_write syscall
mov ebx, 1 ; Specify File Descriptor 1: Standard Output
mov ecx, EatMsg ; Pass offset of the message
mov edx, EatLen ; Pass the length of the message
int 0x80 ; Make syscall to output the text to stdout
mov eax, 1 ; Specify Exit syscall
mov ebx, 0 ; Return a code of zero
int 0x80 ; Make syscall to terminate the program
section .data ; Section containing initialised data
EatMsg db "Eat at Joe's!", 0x0a
EatLen equ $-EatMsg
section .bss ; Section containing uninitialised data
section .text ; Section containing code
global start ; Linker needs this to find the entry point!
然後非常相似的64位版本的OSX，除了改變寄存器的名字，替換INT 80H（我的理解是有點過時）和增加0x2000000到移動到eax的值（不明白這一點）沒有太大的改變。
section .data ; Section containing initialised data
EatMsg db "Eat at Joe's!", 0x0a
EatLen equ $-EatMsg
section .bss ; Section containing uninitialised data
section .text ; Section containing code
global start ; Linker needs this to find the entry point!
start:
mov rax, 0x2000004 ; Specify sys_write syscall
mov rdi, 1 ; Specify File Descriptor 1: Standard Output
mov rsi, EatMsg ; Pass offset of the message
mov rdx, EatLen ; Pass the length of the message
syscall ; Make syscall to output the text to stdout
mov rax, 0x2000001 ; Specify Exit syscall
mov rdi, 0 ; Return a code of zero
syscall ; Make syscall to terminate the program
另一方面，32位mac版本是完全不同的。我可以看到我們正在將參數推向棧dword，所以我的問題是（並且對於長序言）抱歉，eax被推送到的棧和dword之間的區別是什麼，爲什麼我們只使用寄存器而不是在64位版本（和Linux）的堆棧？
section .data ; Section containing initialised data
EatMsg db "Eat at Joe's!", 0x0a
EatLen equ $-EatMsg
section .bss ; Section containing uninitialised data
section .text ; Section containing code
global start ; Linker needs this to find the entry point!
start:
mov eax, 0x4 ; Specify sys_write syscall
push dword EatLen ; Pass the length of the message
push dword EatMsg ; Pass offset of the message
push dword 1 ; Specify File Descriptor 1: Standard Output
push eax
int 0x80 ; Make syscall to output the text to stdout
add esp, 16 ; Move back the stack pointer
mov eax, 0x1 ; Specify Exit syscall
push dword 0 ; Return a code of zero
push eax
int 0x80 ; Make syscall to terminate the program