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julius |
/* This file contains the floating-point save and restore routines.
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*
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* Copyright (C) 2004 Free Software Foundation, Inc.
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*
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* This file is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2, or (at your option) any
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* later version.
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*
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* In addition to the permissions in the GNU General Public License, the
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* Free Software Foundation gives you unlimited permission to link the
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* compiled version of this file with other programs, and to distribute
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* those programs without any restriction coming from the use of this
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* file. (The General Public License restrictions do apply in other
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* respects; for example, they cover modification of the file, and
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* distribution when not linked into another program.)
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*
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* This file is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; see the file COPYING. If not, write to
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* the Free Software Foundation, 51 Franklin Street, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*
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* As a special exception, if you link this library with files
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* compiled with GCC to produce an executable, this does not cause the
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* resulting executable to be covered by the GNU General Public License.
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* This exception does not however invalidate any other reasons why the
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* executable file might be covered by the GNU General Public License.
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*/
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/* THE SAVE AND RESTORE ROUTINES CAN HAVE ONLY ONE GLOBALLY VISIBLE
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ENTRY POINT - callers have to jump to "saveFP+60" to save f29..f31,
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for example. For FP reg saves/restores, it takes one instruction
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(4 bytes) to do the operation; for Vector regs, 2 instructions are
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required (8 bytes.)
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MORAL: DO NOT MESS AROUND WITH THESE FUNCTIONS! */
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#include "darwin-asm.h"
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.text
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.align 2
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/* saveFP saves R0 -- assumed to be the callers LR -- to 8/16(R1). */
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.private_extern saveFP
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saveFP:
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stfd f14,-144(r1)
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stfd f15,-136(r1)
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stfd f16,-128(r1)
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stfd f17,-120(r1)
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stfd f18,-112(r1)
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stfd f19,-104(r1)
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stfd f20,-96(r1)
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stfd f21,-88(r1)
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stfd f22,-80(r1)
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stfd f23,-72(r1)
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stfd f24,-64(r1)
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stfd f25,-56(r1)
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stfd f26,-48(r1)
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stfd f27,-40(r1)
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stfd f28,-32(r1)
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stfd f29,-24(r1)
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stfd f30,-16(r1)
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stfd f31,-8(r1)
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stg r0,SAVED_LR_OFFSET(r1)
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blr
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/* restFP restores the caller`s LR from 8/16(R1). Note that the code for
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this starts at the offset of F30 restoration, so calling this
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routine in an attempt to restore only F31 WILL NOT WORK (it would
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be a stupid thing to do, anyway.) */
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.private_extern restFP
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restFP:
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lfd f14,-144(r1)
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lfd f15,-136(r1)
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lfd f16,-128(r1)
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lfd f17,-120(r1)
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lfd f18,-112(r1)
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lfd f19,-104(r1)
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lfd f20,-96(r1)
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lfd f21,-88(r1)
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lfd f22,-80(r1)
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lfd f23,-72(r1)
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lfd f24,-64(r1)
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lfd f25,-56(r1)
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lfd f26,-48(r1)
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lfd f27,-40(r1)
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lfd f28,-32(r1)
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lfd f29,-24(r1)
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/* restore callers LR */
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lg r0,SAVED_LR_OFFSET(r1)
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lfd f30,-16(r1)
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/* and prepare for return to caller */
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mtlr r0
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lfd f31,-8(r1)
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blr
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