1/* This file contains the floating-point save and restore routines. 2 * 3 * Copyright (C) 2004-2020 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 3, or (at your option) any 8 * later version. 9 * 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 * 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/>. 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 33#include "darwin-asm.h" 34 35.text 36 .align 2 37 38/* saveFP saves R0 -- assumed to be the callers LR -- to 8/16(R1). */ 39 40.private_extern saveFP 41saveFP: 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) 60 stg r0,SAVED_LR_OFFSET(r1) 61 blr 62 63/* restFP restores the caller`s LR from 8/16(R1). Note that the code for 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 69restFP: 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 */ 87 lg r0,SAVED_LR_OFFSET(r1) 88 lfd f30,-16(r1) 89 /* and prepare for return to caller */ 90 mtlr r0 91 lfd f31,-8(r1) 92 blr 93