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Annotation of GNUtools/cc/config/m88k/mot-sysv4.h, revision 1.1.1.1

1.1       root        1: /* Definitions of target machine for GNU compiler.
                      2:    Motorola 88100 Delta machine running SVR4
                      3:    Copyright (C) 1993 Free Software Foundation, Inc.
                      4: 
                      5: This file is part of GNU CC.
                      6: 
                      7: GNU CC is free software; you can redistribute it and/or modify
                      8: it under the terms of the GNU General Public License as published by
                      9: the Free Software Foundation; either version 2, or (at your option)
                     10: any later version.
                     11: 
                     12: GNU CC is distributed in the hope that it will be useful,
                     13: but WITHOUT ANY WARRANTY; without even the implied warranty of
                     14: MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
                     15: GNU General Public License for more details.
                     16: 
                     17: You should have received a copy of the GNU General Public License
                     18: along with GNU CC; see the file COPYING.  If not, write to
                     19: the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */
                     20: 
                     21: #include "m88k/sysv4.h"
                     22: 
                     23: /* The .init section preamble code on the svr4 m88k Delta system looks like:
                     24: 
                     25:                _init:  subu    r31, r31, 0x30
                     26:                        st      r1, r31, 0x20
                     27: 
                     28:    do_global_ctors_aux in crtstuff.c emits do_global_ctors which is put
                     29:    into the .init section.  However, this function has its own 
                     30:    prolog which allocates more of the stack.  The epilogue of do_global_ctors
                     31:    only knows about its own stack allocation, not that in the .init
                     32:    section preamble.  So we must undo the allocation performed by the .init
                     33:    section preamble.  We use the following instruction:
                     34: 
                     35:                        addu    r31, r31, 0x30
                     36: 
                     37:    which is placed immediately after the two instructions shown above
                     38:    and before do_global_ctors.
                     39: 
                     40:    Note that this is a kludge since it depends on knowing the constant
                     41:    0x30 above.  However, no better fix is known at this time.  */
                     42:    
                     43: #undef INIT_SECTION_PREAMBLE
                     44: #define INIT_SECTION_PREAMBLE  asm ("\taddu\t #r31,#r31,0x30")

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