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1 /* This file contains the floating-point save and restore routines.
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2 *
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3 * Copyright (C) 2004, 2009 Free Software Foundation, Inc.
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4 *
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5 * This file is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License as published by the
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7 * Free Software Foundation; either version 3, or (at your option) any
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8 * later version.
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9 *
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10 * This file is distributed in the hope that it will be useful, but
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11 * WITHOUT ANY WARRANTY; without even the implied warranty of
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12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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13 * General Public License for more details.
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14 *
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15 * Under Section 7 of GPL version 3, you are granted additional
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16 * permissions described in the GCC Runtime Library Exception, version
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17 * 3.1, as published by the Free Software Foundation.
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18 *
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19 * You should have received a copy of the GNU General Public License and
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20 * a copy of the GCC Runtime Library Exception along with this program;
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21 * see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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22 * <http://www.gnu.org/licenses/>.
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23 */
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24
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25 /* THE SAVE AND RESTORE ROUTINES CAN HAVE ONLY ONE GLOBALLY VISIBLE
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26 ENTRY POINT - callers have to jump to "saveFP+60" to save f29..f31,
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27 for example. For FP reg saves/restores, it takes one instruction
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28 (4 bytes) to do the operation; for Vector regs, 2 instructions are
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29 required (8 bytes.)
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30
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31 MORAL: DO NOT MESS AROUND WITH THESE FUNCTIONS! */
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32
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33 #include "darwin-asm.h"
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34
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35 .text
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36 .align 2
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37
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38 /* saveFP saves R0 -- assumed to be the callers LR -- to 8/16(R1). */
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39
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40 .private_extern saveFP
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41 saveFP:
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42 stfd f14,-144(r1)
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43 stfd f15,-136(r1)
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44 stfd f16,-128(r1)
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45 stfd f17,-120(r1)
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46 stfd f18,-112(r1)
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47 stfd f19,-104(r1)
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48 stfd f20,-96(r1)
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49 stfd f21,-88(r1)
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50 stfd f22,-80(r1)
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51 stfd f23,-72(r1)
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52 stfd f24,-64(r1)
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53 stfd f25,-56(r1)
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54 stfd f26,-48(r1)
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55 stfd f27,-40(r1)
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56 stfd f28,-32(r1)
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57 stfd f29,-24(r1)
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58 stfd f30,-16(r1)
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59 stfd f31,-8(r1)
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60 stg r0,SAVED_LR_OFFSET(r1)
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61 blr
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62
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63 /* restFP restores the caller`s LR from 8/16(R1). Note that the code for
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64 this starts at the offset of F30 restoration, so calling this
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65 routine in an attempt to restore only F31 WILL NOT WORK (it would
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66 be a stupid thing to do, anyway.) */
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67
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68 .private_extern restFP
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69 restFP:
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70 lfd f14,-144(r1)
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71 lfd f15,-136(r1)
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72 lfd f16,-128(r1)
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73 lfd f17,-120(r1)
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74 lfd f18,-112(r1)
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75 lfd f19,-104(r1)
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76 lfd f20,-96(r1)
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77 lfd f21,-88(r1)
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78 lfd f22,-80(r1)
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79 lfd f23,-72(r1)
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80 lfd f24,-64(r1)
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81 lfd f25,-56(r1)
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82 lfd f26,-48(r1)
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83 lfd f27,-40(r1)
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84 lfd f28,-32(r1)
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85 lfd f29,-24(r1)
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86 /* <OFFSET OF F30 RESTORE> restore callers LR */
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87 lg r0,SAVED_LR_OFFSET(r1)
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88 lfd f30,-16(r1)
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89 /* and prepare for return to caller */
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90 mtlr r0
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91 lfd f31,-8(r1)
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92 blr
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