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m68k: remove unused fpu switch implementation
This commit is contained in:
Andreas Schwab
parent
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commit
fba1e82f6c
@ -1,5 +1,8 @@
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2012-02-26 Andreas Schwab <schwab@linux-m68k.org>
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* sysdeps/m68k/m680x0/fpu/Makefile: Remove.
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* sysdeps/m68k/m680x0/fpu/switch: Remove directory.
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* sysdeps/m68k/m680x0/fpu/k_sinl.c: Replace by empty file.
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* sysdeps/m68k/m680x0/fpu/k_cosl.c: Likewise.
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* sysdeps/m68k/m680x0/fpu/k_tanf.c: Likewise.
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@ -1,11 +0,0 @@
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ifeq ($(subdir),math)
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ifndef math-twiddled
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# Avoid twiddling in generic/Makefile.
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math-twiddled := t
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endif
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bsdmath_dirs := $(bsdmath_dirs) mc68881
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endif
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@ -1,64 +0,0 @@
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/* Copyright (C) 1991, 1992, 1997, 2000 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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#ifndef _68881_SWITCH_H
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#define _68881_SWITCH_H 1
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#include <sys/cdefs.h>
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/* This is the format of the data at the code label for a function which
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wants to switch depending on whether or not a 68881 is present.
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Initially, `insn' is a `jsr' instruction, and `target' is __68881_switch.
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The first time such a function is called, __68881_switch determines whether
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or not a 68881 is present, and modifies the function accordingly.
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Then `insn' is a `jmp' instruction, and `target' is the value of `fpu'
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if there is 68881, or the value of `soft' if not. */
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struct switch_caller
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{
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unsigned short int insn; /* The `jsr' or `jmp' instruction. */
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void *target; /* The target of the instruction. */
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void *soft; /* The address of the soft function. */
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void *fpu; /* The address of the 68881 function. */
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};
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/* These are opcodes (values for `insn', above) for `jmp' and `jsr'
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instructions, respectively, to 32-bit absolute addresses. */
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#define JMP 0x4ef9
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#define JSR 0x4eb9
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/* Function to determine whether or not a 68881 is available,
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and modify its caller (which must be a `struct switch_caller', above,
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in data space) to use the appropriate version. */
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extern void __68881_switch (int __dummy) __THROW;
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/* Define FUNCTION as a `struct switch_caller' which will call
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`__FUNCTION_68881' if a 68881 is present, and `__FUNCTION_soft' if not.
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#define switching_function(FUNCTION) \
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struct switch_caller FUNCTION = \
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{ \
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JSR, (__ptr_t) __68881_switch, \
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__CONCAT(__CONCAT(__,FUNCTION),_soft), \
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__CONCAT(__CONCAT(__,FUNCTION),_68881) \
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}
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#endif /* 68881-switch.h */
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@ -1,51 +0,0 @@
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# Copyright (C) 1991, 1992, 1997 Free Software Foundation, Inc.
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# This file is part of the GNU C Library.
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# The GNU C Library is free software; you can redistribute it and/or
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# modify it under the terms of the GNU Lesser General Public
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# License as published by the Free Software Foundation; either
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# version 2.1 of the License, or (at your option) any later version.
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# The GNU C Library is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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# Lesser General Public License for more details.
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# You should have received a copy of the GNU Lesser General Public
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# License along with the GNU C Library; if not, write to the Free
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# Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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# 02111-1307 USA.
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ifeq ($(subdir),math)
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sysdep_routines := $(sysdep_routines) switch
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# Find all the sources that have 68881 versions.
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+68881-sources := \
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$(notdir $(wildcard $(addprefix $(filter %/fpu,$(sysdirs)),$(sources))))
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# Sysdep directories other than fpu and fpu/switch (this one).
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+non68881-dirs := $(filter-out %/fpu %/fpu/switch,$(+sysdep_dirs))
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# Get a non-68881 version of the target.
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+non68881-version = $(firstword $(wildcard $(addsuffix /$@,$(+non68881-dirs))))
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# Directory containing 68881 sources.
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+68881-dir := $(filter %/fpu,$(+sysdep_dirs))
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# For all the files that have 68881 versions and don't exist already in
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# the source directory (math), automatically make ones that switch between
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# 68881 and soft versions.
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$(addprefix $(objpfx), \
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$(filter-out $(wildcard $(+68881-sources)),$(+68881-sources))):
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(echo '#include <68881-sw.h>' ;\
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echo '#define $* __$*_68881' ;\
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echo '#include <$(+68881-dir)/$@>' ;\
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echo '#undef $*' ;\
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echo '#define $* __$*_soft' ;\
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echo '#include <$(non68881-version)>' ;\
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echo '#undef $*' ;\
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echo 'switching_function($*);') > $@-tmp
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mv $@-tmp $@
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endif
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@ -1 +0,0 @@
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/* We don't want any inlines when we might not have a 68881. */
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@ -1,87 +0,0 @@
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/* Copyright (C) 1991, 1992, 1997 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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#include <signal.h>
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#include <68881-sw.h>
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/* The signal that is sent when a 68881 instruction
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is executed and there is no 68881. */
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#ifndef TRAPSIG
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#define TRAPSIG SIGILL
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#endif
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/* Zero if no 68881, one if we have a 68881, or -1 if we don't know yet. */
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static int have_fpu = -1;
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/* Signal handler for the trap that happens if we don't have a 68881. */
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static void
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trap (sig)
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int sig;
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{
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have_fpu = 0;
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}
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/* This function is called by functions that want to switch.
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The calling function must be a `struct switch_caller' in data space.
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It determines whether a 68881 is present, and modifies its caller
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to be a static jump to either the 68881 version or the soft version.
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It then returns into the function it has chosen to do the work. */
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void
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__68881_switch (dummy)
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int dummy;
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{
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void **return_address_location = &((void **) &dummy)[-1];
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struct switch_caller *const caller
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= (struct switch_caller *) (((short int *) *return_address_location) - 1);
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if (have_fpu < 0)
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{
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/* Figure out whether or not we have a 68881. */
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__sighandler_t handler = signal (TRAPSIG, trap);
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if (handler == SIG_ERR)
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/* We can't figure it out, so assume we don't have a 68881.
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This assumption will never cause us any problems other than
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lost performance, while the reverse assumption could cause
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the program to crash. */
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have_fpu = 0;
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else
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{
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/* We set `have_fpu' to nonzero, and then execute a 68881
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no-op instruction. If we have a 68881, this will do nothing.
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If we don't have one, this will trap and the signal handler
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will clear `have_fpu'. */
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have_fpu = 1;
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asm ("fnop");
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/* Restore the old signal handler. */
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(void) signal (TRAPSIG, handler);
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}
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}
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/* Modify the caller to be a jump to the appropriate address. */
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caller->insn = JMP;
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caller->target = have_fpu ? caller->fpu : caller->soft;
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/* Make the address we will return to be the target we have chosen.
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Our return will match the `jsr' done by the caller we have
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just modified, and it will be just as if that had instead
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been a `jmp' to the new target. */
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*return_address_location = caller->target;
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}
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