diff options
Diffstat (limited to 'sysdeps/m68k/fpu/switch')
| -rw-r--r-- | sysdeps/m68k/fpu/switch/68881-sw.h | 64 | ||||
| -rw-r--r-- | sysdeps/m68k/fpu/switch/Makefile | 51 | ||||
| -rw-r--r-- | sysdeps/m68k/fpu/switch/bits/mathinline.h | 1 | ||||
| -rw-r--r-- | sysdeps/m68k/fpu/switch/switch.c | 87 |
4 files changed, 0 insertions, 203 deletions
diff --git a/sysdeps/m68k/fpu/switch/68881-sw.h b/sysdeps/m68k/fpu/switch/68881-sw.h deleted file mode 100644 index c5a0f71fa6..0000000000 --- a/sysdeps/m68k/fpu/switch/68881-sw.h +++ /dev/null @@ -1,64 +0,0 @@ -/* 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 */ diff --git a/sysdeps/m68k/fpu/switch/Makefile b/sysdeps/m68k/fpu/switch/Makefile deleted file mode 100644 index c04107163c..0000000000 --- a/sysdeps/m68k/fpu/switch/Makefile +++ /dev/null @@ -1,51 +0,0 @@ -# Copyright (C) 1991, 1992, 1997 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. - -ifeq ($(subdir),math) - -sysdep_routines := $(sysdep_routines) switch - -# Find all the sources that have 68881 versions. -+68881-sources := \ - $(notdir $(wildcard $(addprefix $(filter %/fpu,$(sysdirs)),$(sources)))) - -# Sysdep directories other than fpu and fpu/switch (this one). -+non68881-dirs := $(filter-out %/fpu %/fpu/switch,$(+sysdep_dirs)) - -# Get a non-68881 version of the target. -+non68881-version = $(firstword $(wildcard $(addsuffix /$@,$(+non68881-dirs)))) - -# Directory containing 68881 sources. -+68881-dir := $(filter %/fpu,$(+sysdep_dirs)) - -# For all the files that have 68881 versions and don't exist already in -# the source directory (math), automatically make ones that switch between -# 68881 and soft versions. -$(addprefix $(objpfx), \ - $(filter-out $(wildcard $(+68881-sources)),$(+68881-sources))): - (echo '#include <68881-sw.h>' ;\ - echo '#define $* __$*_68881' ;\ - echo '#include <$(+68881-dir)/$@>' ;\ - echo '#undef $*' ;\ - echo '#define $* __$*_soft' ;\ - echo '#include <$(non68881-version)>' ;\ - echo '#undef $*' ;\ - echo 'switching_function($*);') > $@-tmp - mv $@-tmp $@ - -endif diff --git a/sysdeps/m68k/fpu/switch/bits/mathinline.h b/sysdeps/m68k/fpu/switch/bits/mathinline.h deleted file mode 100644 index c0f6966981..0000000000 --- a/sysdeps/m68k/fpu/switch/bits/mathinline.h +++ /dev/null @@ -1 +0,0 @@ -/* We don't want any inlines when we might not have a 68881. */ diff --git a/sysdeps/m68k/fpu/switch/switch.c b/sysdeps/m68k/fpu/switch/switch.c deleted file mode 100644 index e0558176dc..0000000000 --- a/sysdeps/m68k/fpu/switch/switch.c +++ /dev/null @@ -1,87 +0,0 @@ -/* Copyright (C) 1991, 1992, 1997 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. */ - -#include <signal.h> -#include <68881-sw.h> - - -/* The signal that is sent when a 68881 instruction - is executed and there is no 68881. */ -#ifndef TRAPSIG -#define TRAPSIG SIGILL -#endif - -/* Zero if no 68881, one if we have a 68881, or -1 if we don't know yet. */ -static int have_fpu = -1; - - -/* Signal handler for the trap that happens if we don't have a 68881. */ -static void -trap (sig) - int sig; -{ - have_fpu = 0; -} - -/* This function is called by functions that want to switch. - The calling function must be a `struct switch_caller' in data space. - It determines whether a 68881 is present, and modifies its caller - to be a static jump to either the 68881 version or the soft version. - It then returns into the function it has chosen to do the work. */ -void -__68881_switch (dummy) - int dummy; -{ - void **return_address_location = &((void **) &dummy)[-1]; - struct switch_caller *const caller - = (struct switch_caller *) (((short int *) *return_address_location) - 1); - - if (have_fpu < 0) - { - /* Figure out whether or not we have a 68881. */ - __sighandler_t handler = signal (TRAPSIG, trap); - if (handler == SIG_ERR) - /* We can't figure it out, so assume we don't have a 68881. - This assumption will never cause us any problems other than - lost performance, while the reverse assumption could cause - the program to crash. */ - have_fpu = 0; - else - { - /* We set `have_fpu' to nonzero, and then execute a 68881 - no-op instruction. If we have a 68881, this will do nothing. - If we don't have one, this will trap and the signal handler - will clear `have_fpu'. */ - have_fpu = 1; - asm ("fnop"); - - /* Restore the old signal handler. */ - (void) signal (TRAPSIG, handler); - } - } - - /* Modify the caller to be a jump to the appropriate address. */ - caller->insn = JMP; - caller->target = have_fpu ? caller->fpu : caller->soft; - - /* Make the address we will return to be the target we have chosen. - Our return will match the `jsr' done by the caller we have - just modified, and it will be just as if that had instead - been a `jmp' to the new target. */ - *return_address_location = caller->target; -} |