gcc/config/rs6000/darwin-fpsave.asm

   1 /*  This file contains the floating-point save and restore routines.
   2  *
   3  *   Copyright (C) 2004 Free Software Foundation, Inc.
   4  *
   5  * This file is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License as published by the
   7  * Free Software Foundation; either version 2, or (at your option) any
   8  * later version.
   9  *
  10  * In addition to the permissions in the GNU General Public License, the
  11  * Free Software Foundation gives you unlimited permission to link the
  12  * compiled version of this file with other programs, and to distribute
  13  * those programs without any restriction coming from the use of this
  14  * file.  (The General Public License restrictions do apply in other
  15  * respects; for example, they cover modification of the file, and
  16  * distribution when not linked into another program.)
  17  *
  18  * This file is distributed in the hope that it will be useful, but
  19  * WITHOUT ANY WARRANTY; without even the implied warranty of
  20  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  21  * General Public License for more details.
  22  *
  23  * You should have received a copy of the GNU General Public License
  24  * along with this program; see the file COPYING.  If not, write to
  25  * the Free Software Foundation, 59 Temple Place - Suite 330,
  26  * Boston, MA 02111-1307, 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 the
  30  *  resulting executable to be covered by the GNU General Public License.
  31  *  This exception does not however invalidate any other reasons why the
  32  *  executable file might be covered by the GNU General Public License.
  33  */
  34
  35 /* THE SAVE AND RESTORE ROUTINES CAN HAVE ONLY ONE GLOBALLY VISIBLE
  36    ENTRY POINT - callers have to jump to "saveFP+60" to save f29..f31,
  37    for example.  For FP reg saves/restores, it takes one instruction
  38    (4 bytes) to do the operation; for Vector regs, 2 instructions are
  39    required (8 bytes.)
  40
  41    MORAL: DO NOT MESS AROUND WITH THESE FUNCTIONS!  */
  42
  43 #include "darwin-asm.h"
  44
  45 .text
  46         .align 2
  47
  48 /* saveFP saves R0 -- assumed to be the callers LR -- to 8/16(R1).  */
  49
  50 .private_extern saveFP
  51 saveFP:
  52         stfd f14,-144(r1)
  53         stfd f15,-136(r1)
  54         stfd f16,-128(r1)
  55         stfd f17,-120(r1)
  56         stfd f18,-112(r1)
  57         stfd f19,-104(r1)
  58         stfd f20,-96(r1)
  59         stfd f21,-88(r1)
  60         stfd f22,-80(r1)
  61         stfd f23,-72(r1)
  62         stfd f24,-64(r1)
  63         stfd f25,-56(r1)
  64         stfd f26,-48(r1)
  65         stfd f27,-40(r1)
  66         stfd f28,-32(r1)
  67         stfd f29,-24(r1)
  68         stfd f30,-16(r1)
  69         stfd f31,-8(r1)
  70         stg  r0,SAVED_LR_OFFSET(r1)
  71         blr
  72
  73 /* restFP restores the caller`s LR from 8/16(R1).  Note that the code for
  74    this starts at the offset of F30 restoration, so calling this
  75    routine in an attempt to restore only F31 WILL NOT WORK (it would
  76    be a stupid thing to do, anyway.)  */
  77
  78 .private_extern restFP
  79 restFP:
  80         lfd f14,-144(r1)
  81         lfd f15,-136(r1)
  82         lfd f16,-128(r1)
  83         lfd f17,-120(r1)
  84         lfd f18,-112(r1)
  85         lfd f19,-104(r1)
  86         lfd f20,-96(r1)
  87         lfd f21,-88(r1)
  88         lfd f22,-80(r1)
  89         lfd f23,-72(r1)
  90         lfd f24,-64(r1)
  91         lfd f25,-56(r1)
  92         lfd f26,-48(r1)
  93         lfd f27,-40(r1)
  94         lfd f28,-32(r1)
  95         lfd f29,-24(r1)
  96                         /* <OFFSET OF F30 RESTORE> restore callers LR  */
  97         lg r0,SAVED_LR_OFFSET(r1)
  98         lfd f30,-16(r1)
  99                         /* and prepare for return to caller  */
 100         mtlr r0
 101         lfd f31,-8(r1)
 102         blr