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《操作系统》的实验代码。
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os_kernel_lab/related_info/lab4/some-exercises/callee.s

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add lab4 spoc exercises
8 years ago
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  1. .code32
  2. SYSWRITE = 4    # sys_write()系统调用号

  3. .global mywrite
  4. .text
  5. mywrite:
  6.  pushl %ebp
  7.  movl %esp, %ebp
  8.  pushl %ebx
  9.  movl 8(%ebp),%ebx  # ebx ：文件描述符

  10.  movl 12(%ebp),%ecx  # ecx ：缓冲区指针

  11.  movl 16(%ebp),%edx  # edx ：显示字符数

  12.  movl $SYSWRITE,%eax   # eax ：系统调用号

  13.  int $0x80
  14.  popl %ebx
  15.  mov %ebp, %esp
  16.  popl %ebp
  17.  ret