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Mon Jan 20 03:02:50 1997 Ulrich Drepper <drepper@cygnus.com> * Make-dist: Update and reformat copyright. * Makeconfig: Likewise. * assert/Makefile: Likewise. * bare/Makefile: Likewise. * ctype/Makefile: Likewise. * dirent/Makefile: Likewise. * gmon/Makefile: Likewise. * gnulib/Makefile: Likewise. * grp/Makefile: Likewise. * hurd/Makefile: Likewise. * intl/Makefile: Likewise. * mach/Makefile: Likewise. * malloc/Makefile: Likewise. * manual/Makefile: Likewise. * math/Makefile: Likewise. * po/Makefile: Likewise. * pwd/Makefile: Likewise. * resource/Makefile: Likewise. * setjmp/Makefile: Likewise. * socket/Makefile: Likewise. * string/Makefile: Likewise. * sunrpc/Makefile: Likewise. * sysdeps/alpha/Makefile: Likewise. * sysdeps/gnu/Makefile: Likewise. * sysdeps/m68k/fpu/switch/Makefile: Likewise. * sysdeps/m68k/fpu/switch/68881-sw.h: Likewise. * sysdeps/m68k/fpu/switch/switch.c: Likewise. * sysdeps/mach/Makefile: Likewise. * sysdeps/hurd/Makefile: Likewise. * sysdeps/sparc/Makefile: Likewise. * sysdeps/standalone/i960/nindy960/Makefile: Likewise. * sysdeps/standalone/m68k/m68020/mvme136/Makefile: Likewise. * sysdeps/unix/common/Makefile: Likewise. * sysdeps/unix/sysv/Makefile: Likewise. * sysdeps/unix/sysv/irix4/Makefile: Likewise. * sysdeps/unix/sysv/sco3.2/Makefile: Likewise. * sysdeps/unix/sysv/sysv4/Makefile: Likewise. * sysdeps/vax/Makefile: Likewise. * sysvipc/Makefile: Likewise. * wcsmbs/Makefile: Likewise. * wctype/Makefile: Likewise. * elf/rtld.c (dl_main): Objects in LD_PRELOAD environment variable are separated according to Sun docs by white space not colon. * locale/C-time.c (_nl_C_LC_TIME): Use empty string to initialize fields which are not defined for the C locale. * sysdeps/m68k/fpu/switch/Makefile: Don't use ansidecl.h in constructed files. * sysdeps/m68k/fpu/switch/68881-sw.h: Likewise. * sysdeps/m68k/fpu/switch/switch.c: Likewise. Sun Jan 19 19:43:31 1997 Andreas Jaeger <aj@arthur.pfalz.de> * time/strptime.c: Provide prototype for strptime_internal. Sun Jan 19 23:46:27 1997 Ulrich Drepper <drepper@cygnus.com> * glibcbug.in: We don't guarantee confidential handling. Set field to always contain `no'. Sun Jan 19 21:28:01 1997 Philippe De Muyter <phdm@info.ucl.ac.be> * intl/explodename.c: Include sys/types.h. * intl/l10nflist.c: Likewise. Sat Jan 18 22:15:26 1997 Richard Henderson <rth@tamu.edu> * config.make.in (install_root): New variable to make it easy to install glibc somewhere other than /. * shlib-versions: alpha-*-linux-* libc=6.1. Since sigset_t no longer fits in a register, we can't pass in the thread's initial mask so easily. Take this opportunity to simplify the clone implementation by only accepting a single void* argument. * sysdeps/unix/sysv/linux/alpha/clone.S: Only take one argument. * sysdeps/unix/sysv/linux/i386/clone.S: Likewise. * sysdeps/unix/sysv/linux/m68k/clone.S: Likewise. * sysdeps/unix/sysv/linux/sparc/clone.S: Likewise. * sysdeps/unix/sysv/linux/schedbits.h: Update clone prototypes. * sysdeps/unix/sysv/linux/alpha/ioctl-types.h: Remove. Default Linux version should be sufficient. * sysdeps/unix/sysv/linux/alpha/sigprocmask.c: The osf_sigprocmask system call wants the sigset dereferenced. * sysdeps/unix/sysv/linux/alpha/syscalls.list: Add entries for __syscall_ustat and __syscall_xmknod. * sysdeps/unix/sysv/linux/alpha/xmknod.c: Include sys/sysmacros.h. * sysdeps/unix/sysv/linux/sigset.h: Use longs instead of ints. * sysdeps/unix/sysv/linux/tcsetattr.c: Fix pointer dereferences. * sysdeps/unix/sysv/linux/alpha/sigsuspend.c: Add comment about dependency to kernel type. * sysdeps/unix/sysv/linux/alpha/termbits.h: Correct comment.
88 lines
3.0 KiB
C
88 lines
3.0 KiB
C
/* 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 Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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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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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If not,
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write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 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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