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