From c72aa4a26aca9fd04fffb751b93aec59b2f1edc0 Mon Sep 17 00:00:00 2001 From: Ulrich Drepper Date: Thu, 17 Apr 1997 15:09:43 +0000 Subject: [PATCH] m68k specific math exception handling code. --- sysdeps/m68k/fpu/fclrexcpt.c | 39 ++++++++++++++++++++ sysdeps/m68k/fpu/fegetenv.c | 27 ++++++++++++++ sysdeps/m68k/fpu/fegetround.c | 31 ++++++++++++++++ sysdeps/m68k/fpu/feholdexcpt.c | 39 ++++++++++++++++++++ sysdeps/m68k/fpu/fenvbits.h | 80 +++++++++++++++++++++++++++++++++++++++++ sysdeps/m68k/fpu/fesetenv.c | 48 +++++++++++++++++++++++++ sysdeps/m68k/fpu/fesetround.c | 38 ++++++++++++++++++++ sysdeps/m68k/fpu/feupdateenv.c | 39 ++++++++++++++++++++ sysdeps/m68k/fpu/fgetexcptflg.c | 32 +++++++++++++++++ sysdeps/m68k/fpu/fraiseexcpt.c | 74 ++++++++++++++++++++++++++++++++++++++ sysdeps/m68k/fpu/fsetexcptflg.c | 38 ++++++++++++++++++++ sysdeps/m68k/fpu/ftestexcept.c | 32 +++++++++++++++++ 12 files changed, 517 insertions(+) create mode 100644 sysdeps/m68k/fpu/fclrexcpt.c create mode 100644 sysdeps/m68k/fpu/fegetenv.c create mode 100644 sysdeps/m68k/fpu/fegetround.c create mode 100644 sysdeps/m68k/fpu/feholdexcpt.c create mode 100644 sysdeps/m68k/fpu/fenvbits.h create mode 100644 sysdeps/m68k/fpu/fesetenv.c create mode 100644 sysdeps/m68k/fpu/fesetround.c create mode 100644 sysdeps/m68k/fpu/feupdateenv.c create mode 100644 sysdeps/m68k/fpu/fgetexcptflg.c create mode 100644 sysdeps/m68k/fpu/fraiseexcpt.c create mode 100644 sysdeps/m68k/fpu/fsetexcptflg.c create mode 100644 sysdeps/m68k/fpu/ftestexcept.c diff --git a/sysdeps/m68k/fpu/fclrexcpt.c b/sysdeps/m68k/fpu/fclrexcpt.c new file mode 100644 index 0000000..b914bac --- /dev/null +++ b/sysdeps/m68k/fpu/fclrexcpt.c @@ -0,0 +1,39 @@ +/* Clear given exceptions in current floating-point environment. + Copyright (C) 1997 Free Software Foundation, Inc. + This file is part of the GNU C Library. + Contributed by Andreas Schwab + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Library General Public License as + published by the Free Software Foundation; either version 2 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 + Library General Public License for more details. + + You should have received a copy of the GNU Library General Public + License along with the GNU C Library; see the file COPYING.LIB. If not, + write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, + Boston, MA 02111-1307, USA. */ + +#include + +void +feclearexcept (int excepts) +{ + fexcept_t fpsr; + + /* Mask out unsupported bits/exceptions. */ + excepts &= FE_ALL_EXCEPT; + + /* Fetch the fpu status register. */ + __asm__ ("fmove%.l %/fpsr,%0" : "=dm" (fpsr)); + + /* Clear the relevant bits. */ + fpsr &= ~excepts; + + /* Put the new data in effect. */ + __asm__ __volatile__ ("fmove%.l %0,%/fpsr" : : "dm" (fpsr)); +} diff --git a/sysdeps/m68k/fpu/fegetenv.c b/sysdeps/m68k/fpu/fegetenv.c new file mode 100644 index 0000000..59f743a --- /dev/null +++ b/sysdeps/m68k/fpu/fegetenv.c @@ -0,0 +1,27 @@ +/* Store current floating-point environment. + Copyright (C) 1997 Free Software Foundation, Inc. + This file is part of the GNU C Library. + Contributed by Andreas Schwab + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Library General Public License as + published by the Free Software Foundation; either version 2 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 + Library General Public License for more details. + + You should have received a copy of the GNU Library General Public + License along with the GNU C Library; see the file COPYING.LIB. If not, + write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, + Boston, MA 02111-1307, USA. */ + +#include + +void +fegetenv (fenv_t *envp) +{ + __asm__ ("fmovem%.l %/fpcr/%/fpsr,%0" : "=m" (*envp)); +} diff --git a/sysdeps/m68k/fpu/fegetround.c b/sysdeps/m68k/fpu/fegetround.c new file mode 100644 index 0000000..1837a84 --- /dev/null +++ b/sysdeps/m68k/fpu/fegetround.c @@ -0,0 +1,31 @@ +/* Return current rounding direction. + Copyright (C) 1997 Free Software Foundation, Inc. + This file is part of the GNU C Library. + Contributed by Andreas Schwab + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Library General Public License as + published by the Free Software Foundation; either version 2 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 + Library General Public License for more details. + + You should have received a copy of the GNU Library General Public + License along with the GNU C Library; see the file COPYING.LIB. If not, + write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, + Boston, MA 02111-1307, USA. */ + +#include + +int +fegetround (void) +{ + int fpcr; + + __asm__ ("fmove%.l %!,%0" : "=dm" (fpcr)); + + return fpcr & FE_UPWARD; +} diff --git a/sysdeps/m68k/fpu/feholdexcpt.c b/sysdeps/m68k/fpu/feholdexcpt.c new file mode 100644 index 0000000..351fa8a --- /dev/null +++ b/sysdeps/m68k/fpu/feholdexcpt.c @@ -0,0 +1,39 @@ +/* Store current floating-point environment and clear exceptions. + Copyright (C) 1997 Free Software Foundation, Inc. + This file is part of the GNU C Library. + Contributed by Andreas Schwab + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Library General Public License as + published by the Free Software Foundation; either version 2 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 + Library General Public License for more details. + + You should have received a copy of the GNU Library General Public + License along with the GNU C Library; see the file COPYING.LIB. If not, + write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, + Boston, MA 02111-1307, USA. */ + +#include + +int +feholdexcept (fenv_t *envp) +{ + fexcept_t fpcr, fpsr; + + /* Store the environment. */ + __asm__ ("fmovem%.l %/fpcr/%/fpsr,%0" : "=m" (*envp)); + + /* Now clear all exceptions. */ + fpsr = envp->status_register & ~FE_ALL_EXCEPT; + __asm__ __volatile__ ("fmove%.l %0,%/fpsr" : : "dm" (fpsr)); + /* And set all exceptions to non-stop. */ + fpcr = envp->control_register & ~(FE_ALL_EXCEPT << 5); + __asm__ __volatile__ ("fmove%.l %0,%!" : : "dm" (fpcr)); + + return 1; +} diff --git a/sysdeps/m68k/fpu/fenvbits.h b/sysdeps/m68k/fpu/fenvbits.h new file mode 100644 index 0000000..b653b1a --- /dev/null +++ b/sysdeps/m68k/fpu/fenvbits.h @@ -0,0 +1,80 @@ +/* Copyright (C) 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 Library General Public License as + published by the Free Software Foundation; either version 2 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 + Library General Public License for more details. + + You should have received a copy of the GNU Library General Public + License along with the GNU C Library; see the file COPYING.LIB. If not, + write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, + Boston, MA 02111-1307, USA. */ + +/* This file should never be included directly. */ + +#ifndef _FENVBITS_H +#define _FENVBITS_H 1 + +/* Define bits representing the exception. We use the bit positions of + the appropriate bits in the FPSR Accrued Exception Byte. */ +enum + { + FE_INEXACT = 1 << 3, +#define FE_INEXACT FE_INEXACT + FE_DIVBYZERO = 1 << 4, +#define FE_DIVBYZERO FE_DIVBYZERO + FE_UNDERFLOW = 1 << 5, +#define FE_UNDERFLOW FE_UNDERFLOW + FE_OVERFLOW = 1 << 6, +#define FE_OVERFLOW FE_OVERFLOW + FE_INVALID = 1 << 7 +#define FE_INVALID FE_INVALID + }; + +#define FE_ALL_EXCEPT \ + (FE_INEXACT | FE_DIVBYZERO | FE_UNDERFLOW | FE_OVERFLOW | FE_INVALID) + +/* The m68k FPU supports all of the four defined rounding modes. We use + the bit positions in the FPCR Mode Control Byte as the values for the + appropriate macros. */ +enum + { + FE_TONEAREST = 0, +#define FE_TONEAREST FE_TONEAREST + FE_TOWARDSZERO = 1 << 4, +#define FE_TOWARDSZERO FE_TOWARDSZERO + FE_DOWNWARD = 2 << 4, +#define FE_DOWNWARD FE_DOWNWARD + FE_UPWARD = 3 << 4 +#define FE_UPWARD FE_UPWARD + }; + + +/* Type representing exception flags. */ +typedef unsigned int fexcept_t; + + +/* Type representing floating-point environment. This structure + corresponds to the layout of the block written by `fmovem'. */ +typedef struct + { + fexcept_t control_register; + fexcept_t status_register; + } +fenv_t; + +/* If the default argument is used we use this value. */ +#define FE_DFL_ENV ((fenv_t *) -1) + +#ifdef __USE_GNU +/* Floating-point environment where none of the exceptions are masked. */ +# define FE_NOMASK_ENV ((fenv_t *) -2) +#endif + +#endif /* fenvbits.h */ diff --git a/sysdeps/m68k/fpu/fesetenv.c b/sysdeps/m68k/fpu/fesetenv.c new file mode 100644 index 0000000..f6611a2 --- /dev/null +++ b/sysdeps/m68k/fpu/fesetenv.c @@ -0,0 +1,48 @@ +/* Install given floating-point environment. + Copyright (C) 1997 Free Software Foundation, Inc. + This file is part of the GNU C Library. + Contributed by Andreas Schwab + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Library General Public License as + published by the Free Software Foundation; either version 2 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 + Library General Public License for more details. + + You should have received a copy of the GNU Library General Public + License along with the GNU C Library; see the file COPYING.LIB. If not, + write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, + Boston, MA 02111-1307, USA. */ + +#include + +void +fesetenv (const fenv_t *envp) +{ + fenv_t temp; + + /* Install the environment specified by ENVP. But there are a few + values which we do not want to come from the saved environment. + Therefore, we get the current environment and replace the values + we want to use from the environment specified by the parameter. */ + __asm__ ("fmovem%.l %/fpcr/%/fpsr,%0" : "=m" (*&temp)); + + temp.status_register &= ~FE_ALL_EXCEPT; + temp.control_register &= ~((FE_ALL_EXCEPT << 5) | FE_UPWARD); + if (envp == FE_DFL_ENV) + ; + else if (envp == FE_NOMASK_ENV) + temp.control_register |= FE_ALL_EXCEPT << 5; + else + { + temp.control_register |= (envp->control_register + & ((FE_ALL_EXCEPT << 5) | FE_UPWARD)); + temp.status_register |= envp->status_register & FE_ALL_EXCEPT; + } + + __asm__ __volatile__ ("fmovem%.l %0,%/fpcr/%/fpsr" : : "m" (temp)); +} diff --git a/sysdeps/m68k/fpu/fesetround.c b/sysdeps/m68k/fpu/fesetround.c new file mode 100644 index 0000000..8d5466c --- /dev/null +++ b/sysdeps/m68k/fpu/fesetround.c @@ -0,0 +1,38 @@ +/* Set current rounding direction. + Copyright (C) 1997 Free Software Foundation, Inc. + This file is part of the GNU C Library. + Contributed by Andreas Schwab + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Library General Public License as + published by the Free Software Foundation; either version 2 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 + Library General Public License for more details. + + You should have received a copy of the GNU Library General Public + License along with the GNU C Library; see the file COPYING.LIB. If not, + write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, + Boston, MA 02111-1307, USA. */ + +#include + +int +fesetround (int round) +{ + fexcept_t fpcr; + + if (round & ~FE_UPWARD) + /* ROUND is no valid rounding mode. */ + return 0; + + __asm__ ("fmove%.l %!,%0" : "=dm" (fpcr)); + fpcr &= ~FE_UPWARD; + fpcr |= round; + __asm__ __volatile__ ("fmove%.l %0,%!" : : "dm" (fpcr)); + + return 1; +} diff --git a/sysdeps/m68k/fpu/feupdateenv.c b/sysdeps/m68k/fpu/feupdateenv.c new file mode 100644 index 0000000..f5922b4 --- /dev/null +++ b/sysdeps/m68k/fpu/feupdateenv.c @@ -0,0 +1,39 @@ +/* Install given floating-point environment and raise exceptions. + Copyright (C) 1997 Free Software Foundation, Inc. + This file is part of the GNU C Library. + Contributed by Andreas Schwab + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Library General Public License as + published by the Free Software Foundation; either version 2 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 + Library General Public License for more details. + + You should have received a copy of the GNU Library General Public + License along with the GNU C Library; see the file COPYING.LIB. If not, + write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, + Boston, MA 02111-1307, USA. */ + +#include + +void +feupdateenv (const fenv_t *envp) +{ + fexcept_t fpsr; + + /* Save current exceptions. */ + __asm__ ("fmove%.l %/fpsr,%0" : "=dm" (fpsr)); + fpsr &= FE_ALL_EXCEPT; + + /* Install new environment. */ + fesetenv (envp); + + /* Raise the saved exception. Incidently for us the implementation + defined format of the values in objects of type fexcept_t is the + same as the ones specified using the FE_* constants. */ + feraiseexcept ((int) fpsr); +} diff --git a/sysdeps/m68k/fpu/fgetexcptflg.c b/sysdeps/m68k/fpu/fgetexcptflg.c new file mode 100644 index 0000000..4086e1a --- /dev/null +++ b/sysdeps/m68k/fpu/fgetexcptflg.c @@ -0,0 +1,32 @@ +/* Store current representation for exceptions. + Copyright (C) 1997 Free Software Foundation, Inc. + This file is part of the GNU C Library. + Contributed by Andreas Schwab + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Library General Public License as + published by the Free Software Foundation; either version 2 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 + Library General Public License for more details. + + You should have received a copy of the GNU Library General Public + License along with the GNU C Library; see the file COPYING.LIB. If not, + write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, + Boston, MA 02111-1307, USA. */ + +#include + +void +fegetexceptflag (fexcept_t *flagp, int excepts) +{ + fexcept_t fpsr; + + /* Get the current exceptions. */ + __asm__ ("fmove%.l %/fpsr,%0" : "=dm" (fpsr)); + + *flagp = fpsr & excepts & FE_ALL_EXCEPT; +} diff --git a/sysdeps/m68k/fpu/fraiseexcpt.c b/sysdeps/m68k/fpu/fraiseexcpt.c new file mode 100644 index 0000000..b6ff827 --- /dev/null +++ b/sysdeps/m68k/fpu/fraiseexcpt.c @@ -0,0 +1,74 @@ +/* Raise given exceptions. + Copyright (C) 1997 Free Software Foundation, Inc. + This file is part of the GNU C Library. + Contributed by Andreas Schwab + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Library General Public License as + published by the Free Software Foundation; either version 2 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 + Library General Public License for more details. + + You should have received a copy of the GNU Library General Public + License along with the GNU C Library; see the file COPYING.LIB. If not, + write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, + Boston, MA 02111-1307, USA. */ + +#include +#include + +void +feraiseexcept (int excepts) +{ + /* Raise exceptions represented by EXCEPTS. But we must raise only one + signal at a time. It is important that if the overflow/underflow + exception and the divide by zero exception are given at the same + time, the overflow/underflow exception follows the divide by zero + exception. */ + + /* First: invalid exception. */ + if (excepts & FE_INVALID) + { + /* One example of a invalid operation is 0 * Infinity. */ + double d = 0.0 * HUGE_VAL; + /* Now force the exception. */ + __asm__ __volatile__ ("fnop" : : "f" (d)); + } + + /* Next: division by zero. */ + if (excepts & FE_DIVBYZERO) + { + double d = 1.0; + __asm__ __volatile__ ("fdiv%.s %#0r0,%0; fnop" : "=f" (d) : "0" (d)); + } + + /* Next: overflow. */ + if (excepts & FE_OVERFLOW) + { + long double d = LDBL_MAX * LDBL_MAX; + /* Now force the exception. */ + __asm__ __volatile__ ("fnop" : : "f" (d)); + } + + /* Next: underflow. */ + if (excepts & FE_UNDERFLOW) + { + long double d = LDBL_MIN / 16.0; + /* Now force the exception. */ + __asm__ __volatile__ ("fnop" : : "f" (d)); + } + + /* Last: inexact. */ + if (excepts & FE_INEXACT) + { + long double d1, d2 = 1.0; + __asm__ __volatile__ ("fmovecr %#0,%0\n\t" + "fdiv%.x %1,%0\n\t" + "fnop" + : "=&f" (d1) : "f" (d2)); + } +} diff --git a/sysdeps/m68k/fpu/fsetexcptflg.c b/sysdeps/m68k/fpu/fsetexcptflg.c new file mode 100644 index 0000000..aa92ffd --- /dev/null +++ b/sysdeps/m68k/fpu/fsetexcptflg.c @@ -0,0 +1,38 @@ +/* Set floating-point environment exception handling. + Copyright (C) 1997 Free Software Foundation, Inc. + This file is part of the GNU C Library. + Contributed by Andreas Schwab + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Library General Public License as + published by the Free Software Foundation; either version 2 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 + Library General Public License for more details. + + You should have received a copy of the GNU Library General Public + License along with the GNU C Library; see the file COPYING.LIB. If not, + write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, + Boston, MA 02111-1307, USA. */ + +#include +#include + +void +fesetexceptflag (const fexcept_t *flagp, int excepts) +{ + fexcept_t fpsr; + + /* Get the current status register. */ + __asm__ ("fmove%.l %/fpsr,%0" : "=dm" (fpsr)); + + /* Install the new exception bits in the Accrued Exception Byte. */ + fpsr &= ~(excepts & FE_ALL_EXCEPT); + fpsr |= *flagp & excepts & FE_ALL_EXCEPT; + + /* Store the new status register. */ + __asm__ __volatile__ ("fmove%.l %0,%/fpsr" : : "dm" (fpsr)); +} diff --git a/sysdeps/m68k/fpu/ftestexcept.c b/sysdeps/m68k/fpu/ftestexcept.c new file mode 100644 index 0000000..c092ce1 --- /dev/null +++ b/sysdeps/m68k/fpu/ftestexcept.c @@ -0,0 +1,32 @@ +/* Test exception in current environment. + Copyright (C) 1997 Free Software Foundation, Inc. + This file is part of the GNU C Library. + Contributed by Andreas Schwab + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Library General Public License as + published by the Free Software Foundation; either version 2 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 + Library General Public License for more details. + + You should have received a copy of the GNU Library General Public + License along with the GNU C Library; see the file COPYING.LIB. If not, + write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, + Boston, MA 02111-1307, USA. */ + +#include + +int +fetestexcept (int excepts) +{ + fexcept_t fpsr; + + /* Get current exceptions. */ + __asm__ ("fmove%.l %/fpsr,%0" : "=dm" (fpsr)); + + return fpsr & excepts & FE_ALL_EXCEPT; +} -- 2.7.4