mirror of
https://sourceware.org/git/glibc.git
synced 2024-12-24 11:41:07 +00:00
41bdb6e20c
2001-07-06 Paul Eggert <eggert@twinsun.com> * manual/argp.texi: Remove ignored LGPL copyright notice; it's not appropriate for documentation anyway. * manual/libc-texinfo.sh: "Library General Public License" -> "Lesser General Public License". 2001-07-06 Andreas Jaeger <aj@suse.de> * All files under GPL/LGPL version 2: Place under LGPL version 2.1.
65 lines
2.5 KiB
C
65 lines
2.5 KiB
C
/* Copyright (C) 1991, 1992, 1997, 2000 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
|
|
The GNU C Library is free software; you can redistribute it and/or
|
|
modify it under the terms of the GNU Lesser General Public
|
|
License as published by the Free Software Foundation; either
|
|
version 2.1 of the License, or (at your option) any later version.
|
|
|
|
The GNU C Library 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
|
|
Lesser General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public
|
|
License along with the GNU C Library; if not, write to the Free
|
|
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
|
|
02111-1307 USA. */
|
|
|
|
#ifndef _68881_SWITCH_H
|
|
|
|
#define _68881_SWITCH_H 1
|
|
#include <sys/cdefs.h>
|
|
|
|
/* This is the format of the data at the code label for a function which
|
|
wants to switch depending on whether or not a 68881 is present.
|
|
|
|
Initially, `insn' is a `jsr' instruction, and `target' is __68881_switch.
|
|
The first time such a function is called, __68881_switch determines whether
|
|
or not a 68881 is present, and modifies the function accordingly.
|
|
Then `insn' is a `jmp' instruction, and `target' is the value of `fpu'
|
|
if there is 68881, or the value of `soft' if not. */
|
|
|
|
struct switch_caller
|
|
{
|
|
unsigned short int insn; /* The `jsr' or `jmp' instruction. */
|
|
void *target; /* The target of the instruction. */
|
|
void *soft; /* The address of the soft function. */
|
|
void *fpu; /* The address of the 68881 function. */
|
|
};
|
|
|
|
/* These are opcodes (values for `insn', above) for `jmp' and `jsr'
|
|
instructions, respectively, to 32-bit absolute addresses. */
|
|
#define JMP 0x4ef9
|
|
#define JSR 0x4eb9
|
|
|
|
|
|
/* Function to determine whether or not a 68881 is available,
|
|
and modify its caller (which must be a `struct switch_caller', above,
|
|
in data space) to use the appropriate version. */
|
|
extern void __68881_switch (int __dummy) __THROW;
|
|
|
|
|
|
/* Define FUNCTION as a `struct switch_caller' which will call
|
|
`__FUNCTION_68881' if a 68881 is present, and `__FUNCTION_soft' if not.
|
|
#define switching_function(FUNCTION) \
|
|
struct switch_caller FUNCTION = \
|
|
{ \
|
|
JSR, (__ptr_t) __68881_switch, \
|
|
__CONCAT(__CONCAT(__,FUNCTION),_soft), \
|
|
__CONCAT(__CONCAT(__,FUNCTION),_68881) \
|
|
}
|
|
|
|
|
|
#endif /* 68881-switch.h */
|