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93 lines
2.6 KiB
ArmAsm
93 lines
2.6 KiB
ArmAsm
/* This file contains the floating-point save and restore routines.
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*
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* Copyright (C) 2004-2017 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 3, or (at your option) any
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* later version.
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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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* Under Section 7 of GPL version 3, you are granted additional
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* permissions described in the GCC Runtime Library Exception, version
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* 3.1, as published by the Free Software Foundation.
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*
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* You should have received a copy of the GNU General Public License and
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* a copy of the GCC Runtime Library Exception along with this program;
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* see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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* <http://www.gnu.org/licenses/>.
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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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/* <OFFSET OF F30 RESTORE> 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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