gcc/config/sparc/sol2-c1.asm

   1 ! crt1.s for solaris 2.0.
   2
   3 !   Copyright (C) 1992 Free Software Foundation, Inc.
   4 !   Written By David Vinayak Henkel-Wallace, June 1992
   5 !
   6 ! This file is free software; you can redistribute it and/or modify it
   7 ! under the terms of the GNU General Public License as published by the
   8 ! Free Software Foundation; either version 2, or (at your option) any
   9 ! later version.
  10 !
  11 ! In addition to the permissions in the GNU General Public License, the
  12 ! Free Software Foundation gives you unlimited permission to link the
  13 ! compiled version of this file with other programs, and to distribute
  14 ! those programs without any restriction coming from the use of this
  15 ! file.  (The General Public License restrictions do apply in other
  16 ! respects; for example, they cover modification of the file, and
  17 ! distribution when not linked into another program.)
  18 !
  19 ! This file is distributed in the hope that it will be useful, but
  20 ! WITHOUT ANY WARRANTY; without even the implied warranty of
  21 ! MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  22 ! General Public License for more details.
  23 !
  24 ! You should have received a copy of the GNU General Public License
  25 ! along with this program; see the file COPYING.  If not, write to
  26 ! the Free Software Foundation, 59 Temple Place - Suite 330,
  27 ! Boston, MA 02111-1307, USA.
  28 !
  29 !    As a special exception, if you link this library with files
  30 !    compiled with GCC to produce an executable, this does not cause
  31 !    the resulting executable to be covered by the GNU General Public License.
  32 !    This exception does not however invalidate any other reasons why
  33 !    the executable file might be covered by the GNU General Public License.
  34 !
  35
  36 ! This file takes control of the process from the kernel, as specified
  37 ! in section 3 of the SVr4 ABI.
  38 ! This file is the first thing linked into any executable.
  39
  40         .section        ".text"
  41         .proc   022
  42         .global _start
  43
  44 _start:
  45         mov     0, %fp          ! Mark bottom frame pointer
  46         ld      [%sp + 64], %l0 ! argc
  47         add     %sp, 68, %l1    ! argv
  48
  49         ! Leave some room for a call.  Sun leaves 32 octets (to sit on
  50         ! a cache line?) so we do too.
  51         sub     %sp, 32, %sp
  52
  53         ! %g1 may contain a function to be registered w/atexit
  54         orcc    %g0, %g1, %g0
  55         be      .nope
  56         mov     %g1, %o0
  57         call    atexit
  58         nop
  59 .nope:
  60         ! Now make sure constructors and destructors are handled.
  61         set     _fini, %o0
  62         call    atexit, 1
  63         nop
  64         call    _init, 0
  65         nop
  66
  67         ! We ignore the auxiliary vector; there's no defined way to
  68         ! access those data anyway.  Instead, go straight to main:
  69         mov     %l0, %o0        ! argc
  70         mov     %l1, %o1        ! argv
  71         ! Skip argc words past argv, to env:
  72         sll     %l0, 2, %o2
  73         add     %o2, 4, %o2
  74         add     %l1, %o2, %o2   ! env
  75         set     _environ, %o3
  76         st      %o2, [%o3]      ! *_environ
  77         call    main, 4
  78         nop
  79         call    exit, 0
  80         nop
  81         call    _exit, 0
  82         nop
  83         ! We should never get here.
  84
  85         .type   _start,#function
  86         .size   _start,.-_start