1 /* This file contains the floating-point save and restore routines.
3 * Copyright (C) 2004 Free Software Foundation, Inc.
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 2, or (at your option) any
10 * In addition to the permissions in the GNU General Public License, the
11 * Free Software Foundation gives you unlimited permission to link the
12 * compiled version of this file with other programs, and to distribute
13 * those programs without any restriction coming from the use of this
14 * file. (The General Public License restrictions do apply in other
15 * respects; for example, they cover modification of the file, and
16 * distribution when not linked into another program.)
18 * This file is distributed in the hope that it will be useful, but
19 * WITHOUT ANY WARRANTY; without even the implied warranty of
20 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
21 * General Public License for more details.
23 * You should have received a copy of the GNU General Public License
24 * along with this program; see the file COPYING. If not, write to
25 * the Free Software Foundation, 51 Franklin Street, Fifth Floor,
26 * Boston, MA 02110-1301, USA.
28 * As a special exception, if you link this library with files
29 * compiled with GCC to produce an executable, this does not cause the
30 * resulting executable to be covered by the GNU General Public License.
31 * This exception does not however invalidate any other reasons why the
32 * executable file might be covered by the GNU General Public License.
35 /* THE SAVE AND RESTORE ROUTINES CAN HAVE ONLY ONE GLOBALLY VISIBLE
36 ENTRY POINT - callers have to jump to "saveFP+60" to save f29..f31,
37 for example. For FP reg saves/restores, it takes one instruction
38 (4 bytes) to do the operation; for Vector regs, 2 instructions are
41 MORAL: DO NOT MESS AROUND WITH THESE FUNCTIONS! */
43 #include "darwin-asm.h"
48 /* saveFP saves R0 -- assumed to be the callers LR -- to 8/16(R1). */
50 .private_extern saveFP
70 stg r0,SAVED_LR_OFFSET(r1)
73 /* restFP restores the caller`s LR from 8/16(R1). Note that the code for
74 this starts at the offset of F30 restoration, so calling this
75 routine in an attempt to restore only F31 WILL NOT WORK (it would
76 be a stupid thing to do, anyway.) */
78 .private_extern restFP
96 /* <OFFSET OF F30 RESTORE> restore callers LR */
97 lg r0,SAVED_LR_OFFSET(r1)
99 /* and prepare for return to caller */