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《操作系统》的实验代码。
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os_kernel_lab/labcodes/lab5/user/libs/initcode.S

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initial version
12 years ago
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  1. .text
  2. .globl _start
  3. _start:
  4.     # set ebp for backtrace

  5.     movl $0x0, %ebp
  6. 

  7.     # move down the esp register

  8.     # since it may cause page fault in backtrace

  9.     subl $0x20, %esp
  10. 

  11.     # call user-program function

  12.     call umain
  13. 1:  jmp 1b
  14.