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1 | /* This file contains the floating-point save and restore routines. |
| 2 | * |
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3 | * Copyright (C) 2004-2016 Free Software Foundation, Inc. |
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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 |
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7 | * Free Software Foundation; either version 3, or (at your option) any |
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8 | * later version. |
| 9 | * |
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10 | * This file is distributed in the hope that it will be useful, but |
| 11 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 13 | * General Public License for more details. |
| 14 | * |
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15 | * Under Section 7 of GPL version 3, you are granted additional |
| 16 | * permissions described in the GCC Runtime Library Exception, version |
| 17 | * 3.1, as published by the Free Software Foundation. |
| 18 | * |
| 19 | * You should have received a copy of the GNU General Public License and |
| 20 | * a copy of the GCC Runtime Library Exception along with this program; |
| 21 | * see the files COPYING3 and COPYING.RUNTIME respectively. If not, see |
| 22 | * <http://www.gnu.org/licenses/>. |
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23 | */ |
| 24 | |
| 25 | /* THE SAVE AND RESTORE ROUTINES CAN HAVE ONLY ONE GLOBALLY VISIBLE |
| 26 | ENTRY POINT - callers have to jump to "saveFP+60" to save f29..f31, |
| 27 | for example. For FP reg saves/restores, it takes one instruction |
| 28 | (4 bytes) to do the operation; for Vector regs, 2 instructions are |
| 29 | required (8 bytes.) |
| 30 | |
| 31 | MORAL: DO NOT MESS AROUND WITH THESE FUNCTIONS! */ |
| 32 | |
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33 | #include "darwin-asm.h" |
| 34 | |
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35 | .text |
| 36 | .align 2 |
| 37 | |
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38 | /* saveFP saves R0 -- assumed to be the callers LR -- to 8/16(R1). */ |
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39 | |
| 40 | .private_extern saveFP |
| 41 | saveFP: |
| 42 | stfd f14,-144(r1) |
| 43 | stfd f15,-136(r1) |
| 44 | stfd f16,-128(r1) |
| 45 | stfd f17,-120(r1) |
| 46 | stfd f18,-112(r1) |
| 47 | stfd f19,-104(r1) |
| 48 | stfd f20,-96(r1) |
| 49 | stfd f21,-88(r1) |
| 50 | stfd f22,-80(r1) |
| 51 | stfd f23,-72(r1) |
| 52 | stfd f24,-64(r1) |
| 53 | stfd f25,-56(r1) |
| 54 | stfd f26,-48(r1) |
| 55 | stfd f27,-40(r1) |
| 56 | stfd f28,-32(r1) |
| 57 | stfd f29,-24(r1) |
| 58 | stfd f30,-16(r1) |
| 59 | stfd f31,-8(r1) |
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60 | stg r0,SAVED_LR_OFFSET(r1) |
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61 | blr |
| 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 |
| 65 | routine in an attempt to restore only F31 WILL NOT WORK (it would |
| 66 | be a stupid thing to do, anyway.) */ |
| 67 | |
| 68 | .private_extern restFP |
| 69 | restFP: |
| 70 | lfd f14,-144(r1) |
| 71 | lfd f15,-136(r1) |
| 72 | lfd f16,-128(r1) |
| 73 | lfd f17,-120(r1) |
| 74 | lfd f18,-112(r1) |
| 75 | lfd f19,-104(r1) |
| 76 | lfd f20,-96(r1) |
| 77 | lfd f21,-88(r1) |
| 78 | lfd f22,-80(r1) |
| 79 | lfd f23,-72(r1) |
| 80 | lfd f24,-64(r1) |
| 81 | lfd f25,-56(r1) |
| 82 | lfd f26,-48(r1) |
| 83 | lfd f27,-40(r1) |
| 84 | lfd f28,-32(r1) |
| 85 | lfd f29,-24(r1) |
| 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) |
| 89 | /* and prepare for return to caller */ |
| 90 | mtlr r0 |
| 91 | lfd f31,-8(r1) |
| 92 | blr |
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