2.11BSD#431 - /usr/src/lib/libc/pdp/sys/execl.s

   1: /*
   2:  * Copyright (c) 1987 Regents of the University of California.
   3:  * All rights reserved.  The Berkeley software License Agreement
   4:  * specifies the terms and conditions for redistribution.
   5:  */
   6: 
   7: #ifdef SYSLIBC_SCCS
   8: _sccsid: <@(#)execl.s	2.6 (2.11BSD GTE) 1995/05/08\0>
   9:         .even
  10: #endif SYSLIBC_SCCS
  11: 
  12: /*
  13:  * XXX - this routine can't use SYSCALL!!!
  14:  */
  15: #include "SYS.h"
  16: 
  17: .globl  _environ
  18: 
  19: ENTRY(execl)
  20:         mov     _environ,-(sp)  / pass default environment
  21:         mov     sp,r0           / calculate and pass address of first argv
  22:         add     $6.,r0          /   element (can't use "mov sp,-(sp)")
  23:         mov     r0,-(sp)
  24:         mov     6(sp),-(sp)     / pass the name
  25:         tst     -(sp)           / simulate return address stack spacing
  26:         SYS(execve)             /   and go for it ...
      /
      /   trap 59 -> [kernel] -> syscall() -> via sysent[] -> handler: execve
      /
  27:         add     $8.,sp          / if we get back it's an error
  28:         jmp     x_error

Defined functions