Linux 在nasm上使用execvp

我现在正在学习NASM，可能是linux系统调用。我正试图复制一个进程并调用linux实用程序，但execvp也有同样的问题，我不知道如何向它传递参数。我怎样才能做到这一点

SECTION .data
    cmd_cat: db '/bin/cat', 0
    arg_cat: db 'log.txt', 0
    cat: dd cmd_cat, arg_cat, 0

     fd1: dw 0, 0
     pipe_error_message: db 'pipe error occured', 0xa
     pipe_error_message_length: equ $ - pipe_error_message

     fork_error_message: db 'fork error occured', 0xa
     fork_error_message_length: equ $ - fork_error_message
SECTION .text
GLOBAL _start:
_start:
     ;call pipe(fd1)
     ;42 - pipe system call number
     mov eax, 42
     mov ebx, fd1

     ;call kernel to execute
     int 080h
     cmp eax, 0
     jne pipe_error


     ;call pipe(fd2)
      mov eax, 42
      mov ebx, fd1
      int 080h
      cmp eax, 0
      jne pipe_error

      ;fork()
      mov eax, 2
      int 080h
      cmp eax, -1
      je fork_error
      jnz child_cat 
      call exit

 ;displays error message and finishes the programm when something is wrong with pipe
 pipe_error:
     mov edx, pipe_error_message_length
     mov ecx, pipe_error_message
     call sys_write
     call exit

 ;displays error message and finishes the programm when something is wrong with fork
 fork_error:
      mov edx, fork_error_message_length
      mov ecx, fork_error_message
      call sys_write
      call exit

 ;sys_write(unsigned int fd, const char __user *buf, size_t count);
 sys_write:
      mov ebx, 1               
      mov eax, 4               
      int 080h


 ;exit(0)
 exit: 
      mov  eax,1
      mov  ebx,0
      int 080h

 child_cat:
      mov ebx, [fd1]
      mov eax, 6
      int 080h

      ;dup2(fds[1],1)
      mov ecx, 1
      mov ebx, [fds + 4]
      mov eax, 63
      int 080h

      mov eax, 11
      mov ebx, cmd_cat
      mov ecx, cat
      int 080h

---

下面的代码在gas汇编程序中适用于我。我已经解释了它的功能，所以希望其他人能够提供nasm翻译

.text

    .global _start

_start:

    movl $0xb, %eax          # system call 0xb (execve) goes in eax

    movl $arg0, %ebx         # put the _address_ of the command string 
                             # in ebx (we are providing a pointer)

    movl $ptrarray, %ecx     # put the _address_ of the array of pointers 
                             # to arguments in ecx (again, a pointer)

    movl $0, %edx            # put a literal zero in edx (we don't have 
                             # environment variables to pass, so we give
                             # a null pointer)

    int $0x80                # run the system call

.data


ptrarray:                    # This is the array of pointers to command line 
                             # arguments
    .long arg0, arg1, 0      # The first element is a _pointer_ to the command 
                             # The second element is a _pointer_ to an argument
                             # The third is a null pointer to indicate no more

arg0:                        # This is the command string
    .asciz "/bin/cat"
arg1:                        # This is the argument string
    .asciz "file.txt"

---

execve系统调用（eax=0xb）将运行一个文件，查找指向ebx中文件名（以null结尾的字符串）的指针、指向ecx中参数指针数组的指针以及指向edx中环境变量指针数组的指针。每个数组都必须由空指针终止，而其他每个元素都是指向以空结尾的字符串（参数或环境变量，视情况而定）的指针。（越来越多）。这就是你想要的吗？是的，谢谢，但我不知道如何在NASM中声明它们（指针数组）。你知道怎么做吗？或者你知道一些文档吗？在x86系统上，指针的大小是4字节。要在初始化为NUL的4字节存储器的.data部分声明数组，请使用：

nameofptr times N dd 0

。（其中

N

是所需的指针数）。它与

name of ptr dd 0,0,0,0,0…..

参见NASM手册第3.2.5节。零终止字符串！然后

数组dd arg\u cat，cmd\u cat，0