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Annotation of GNUtools/cc/config/sparc/sol2-c1.asm, revision 1.1.1.1

1.1       root        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, 675 Mass Ave, Cambridge, MA 02139, USA.
                     27: ! 
                     28: !    As a special exception, if you link this library with files
                     29: !    compiled with GCC to produce an executable, this does not cause
                     30: !    the resulting executable to be covered by the GNU General Public License.
                     31: !    This exception does not however invalidate any other reasons why
                     32: !    the executable file might be covered by the GNU General Public License.
                     33: ! 
                     34: 
                     35: ! This file takes control of the process from the kernel, as specified
                     36: ! in section 3 of the SVr4 ABI.
                     37: ! This file is the first thing linked into any executable.
                     38: 
                     39:        .section        ".text"
                     40:        .proc   022
                     41:        .global _start
                     42: 
                     43: _start:
                     44:        mov     0, %fp          ! Mark bottom frame pointer
                     45:        ld      [%sp + 64], %l0 ! argc
                     46:        add     %sp, 68, %l1    ! argv
                     47: 
                     48:        ! Leave some room for a call.  Sun leaves 32 octets (to sit on
                     49:        ! a cache line?) so we do too.
                     50:        sub     %sp, 32, %sp
                     51: 
                     52:        ! %g1 may contain a function to be registered w/atexit
                     53:        orcc    %g0, %g1, %g0
                     54:        be      .nope
                     55:        mov     %g1, %o0
                     56:        call    atexit
                     57:        nop   
                     58: .nope:
                     59:        ! Now make sure constructors and destructors are handled.
                     60:        set     _fini, %o0
                     61:        call    atexit, 1
                     62:        nop
                     63:        call    _init, 0
                     64:        nop
                     65: 
                     66:        ! We ignore the auxiliary vector; there's no defined way to
                     67:        ! access those data anyway.  Instead, go straight to main:
                     68:        mov     %l0, %o0        ! argc
                     69:        mov     %l1, %o1        ! argv
                     70:        ! Skip argc words past argv, to env:
                     71:        sll     %l0, 2, %o2
                     72:        add     %o2, 4, %o2
                     73:        add     %l1, %o2, %o2   ! env
                     74:        set     _environ, %o3
                     75:        st      %o2, [%o3]      ! *_environ
                     76:        call    main, 4
                     77:        nop   
                     78:        call    exit, 0
                     79:        nop   
                     80:        call    _exit, 0
                     81:        nop   
                     82:        ! We should never get here.
                     83: 
                     84:        .type   _start,#function
                     85:        .size   _start,.-_start

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