[Alpha/Linux ] Stack layout/and register values for ret_from_sys_call

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Hi,

 Can someone explain me what should be the stack layout and register
value( if there is any restriction ) before calling ret_from_syscall for
Alpha. Again in entry.S i find may places where we make current (
Register 8) as below

  lda $8,0x3fff
  bic $30,$8,$8

If someone can expain what happens in the above two assembly statement
it will be really helpful.

Thanks in advance.

-aneesh

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