diff options
Diffstat (limited to 'sysdeps/arm')
| -rw-r--r-- | sysdeps/arm/fpu/bits/fenv.h | 58 | ||||
| -rw-r--r-- | sysdeps/arm/fpu/fclrexcpt.c | 39 | ||||
| -rw-r--r-- | sysdeps/arm/fpu/fegetenv.c | 29 | ||||
| -rw-r--r-- | sysdeps/arm/fpu/fegetround.c | 26 | ||||
| -rw-r--r-- | sysdeps/arm/fpu/fesetenv.c | 33 | ||||
| -rw-r--r-- | sysdeps/arm/fpu/fesetround.c | 27 | ||||
| -rw-r--r-- | sysdeps/arm/fpu/fraiseexcpt.c | 32 | ||||
| -rw-r--r-- | sysdeps/arm/fpu/fsetexcptflag.c | 38 | ||||
| -rw-r--r-- | sysdeps/arm/fpu/ftestexcept.c | 32 | ||||
| -rw-r--r-- | sysdeps/arm/fpu_control.h | 61 |
10 files changed, 367 insertions, 8 deletions
diff --git a/sysdeps/arm/fpu/bits/fenv.h b/sysdeps/arm/fpu/bits/fenv.h new file mode 100644 index 0000000..17b9702 --- /dev/null +++ b/sysdeps/arm/fpu/bits/fenv.h @@ -0,0 +1,58 @@ +/* Copyright (C) 1997, 1998 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. */ + +#ifndef _FENV_H +# error "Never use <bits/fenv.h> directly; include <fenv.h> instead." +#endif + +/* Define bits representing exceptions in the FPU status word. */ +enum + { + FE_INVALID = 1, +#define FE_INVALID FE_INVALID + FE_DIVBYZERO = 2, +#define FE_DIVBYZERO FE_DIVBYZERO + FE_OVERFLOW = 4, +#define FE_OVERFLOW FE_OVERFLOW + FE_UNDERFLOW = 8, +#define FE_UNDERFLOW FE_UNDERFLOW + }; + +/* Amount to shift by to convert an exception to a mask bit. */ +#define FE_EXCEPTION_SHIFT 16 + +/* All supported exceptions. */ +#define FE_ALL_EXCEPT \ + (FE_INVALID | FE_DIVBYZERO | FE_OVERFLOW | FE_UNDERFLOW) + +/* The ARM FPU basically only supports round-to-nearest. Other rounding + modes exist, but you have to encode them in the actual instruction. */ +#define FE_TONEAREST 0 + +/* Type representing exception flags. */ +typedef unsigned long fexcept_t; + +/* Type representing floating-point environment. */ +typedef struct + { + unsigned long cw; + } +fenv_t; + +/* If the default argument is used we use this value. */ +#define FE_DFL_ENV ((fenv_t *) -1l) diff --git a/sysdeps/arm/fpu/fclrexcpt.c b/sysdeps/arm/fpu/fclrexcpt.c new file mode 100644 index 0000000..34ad36d --- /dev/null +++ b/sysdeps/arm/fpu/fclrexcpt.c @@ -0,0 +1,39 @@ +/* Clear given exceptions in current floating-point environment. + Copyright (C) 1997, 1998 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. */ + +#include <fenv.h> +#include <fpu_control.h> + +void +feclearexcept (int excepts) +{ + unsigned long int temp; + + /* Mask out unsupported bits/exceptions. */ + excepts &= FE_ALL_EXCEPT; + + /* Get the current floating point status. */ + _FPU_GETCW(temp); + + /* Clear the relevant bits. */ + temp &= excepts ^ FE_ALL_EXCEPT; + + /* Put the new data in effect. */ + _FPU_SETCW(temp); +} diff --git a/sysdeps/arm/fpu/fegetenv.c b/sysdeps/arm/fpu/fegetenv.c new file mode 100644 index 0000000..5b31c5e --- /dev/null +++ b/sysdeps/arm/fpu/fegetenv.c @@ -0,0 +1,29 @@ +/* Store current floating-point environment. + Copyright (C) 1997, 1998 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. */ + +#include <fenv.h> +#include <fpu_control.h> + +void +fegetenv (fenv_t *envp) +{ + unsigned long int temp; + _FPU_GETCW(temp); + envp->cw = temp; +} diff --git a/sysdeps/arm/fpu/fegetround.c b/sysdeps/arm/fpu/fegetround.c new file mode 100644 index 0000000..5f354bb --- /dev/null +++ b/sysdeps/arm/fpu/fegetround.c @@ -0,0 +1,26 @@ +/* Return current rounding direction. + Copyright (C) 1997, 1998 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. */ + +#include <fenv.h> + +int +fegetround (void) +{ + return FE_TONEAREST; /* Easy. :-) */ +} diff --git a/sysdeps/arm/fpu/fesetenv.c b/sysdeps/arm/fpu/fesetenv.c new file mode 100644 index 0000000..b2d3ec5 --- /dev/null +++ b/sysdeps/arm/fpu/fesetenv.c @@ -0,0 +1,33 @@ +/* Install given floating-point environment. + Copyright (C) 1997, 1998 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. */ + +#include <fenv.h> +#include <fpu_control.h> + +void +fesetenv (const fenv_t *envp) +{ + if (envp == FE_DFL_ENV) + _FPU_SETCW(_FPU_DEFAULT); + else + { + unsigned long temp = envp->cw; + _FPU_SETCW(temp); + } +} diff --git a/sysdeps/arm/fpu/fesetround.c b/sysdeps/arm/fpu/fesetround.c new file mode 100644 index 0000000..7591b39 --- /dev/null +++ b/sysdeps/arm/fpu/fesetround.c @@ -0,0 +1,27 @@ +/* Set current rounding direction. + Copyright (C) 1997, 1998 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. */ + +#include <fenv.h> + +int +fesetround (int round) +{ + /* We only support FE_TONEAREST, so there is no need for any work. */ + return (round == FE_TONEAREST)?1:0; +} diff --git a/sysdeps/arm/fpu/fraiseexcpt.c b/sysdeps/arm/fpu/fraiseexcpt.c new file mode 100644 index 0000000..0fbfb16 --- /dev/null +++ b/sysdeps/arm/fpu/fraiseexcpt.c @@ -0,0 +1,32 @@ +/* Raise given exceptions. + Copyright (C) 1997, 1998 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. */ + +#include <fenv.h> +#include <fpu_control.h> +#include <math.h> + +void +feraiseexcept (int excepts) +{ + /* Raise exceptions represented by EXPECTS. */ + fexcept_t temp; + _FPU_GETCW(temp); + temp |= (excepts & FE_ALL_EXCEPT); + _FPU_SETCW(temp); +} diff --git a/sysdeps/arm/fpu/fsetexcptflag.c b/sysdeps/arm/fpu/fsetexcptflag.c new file mode 100644 index 0000000..f5c06a6 --- /dev/null +++ b/sysdeps/arm/fpu/fsetexcptflag.c @@ -0,0 +1,38 @@ +/* Set floating-point environment exception handling. + Copyright (C) 1997, 1998 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. */ + +#include <fenv.h> +#include <math.h> +#include <fpu_control.h> + +void +fesetexceptflag (const fexcept_t *flagp, int excepts) +{ + fexcept_t temp; + + /* Get the current environment. */ + _FPU_GETCW(temp); + + /* Set the desired exception mask. */ + temp &= ~((excepts & FE_ALL_EXCEPT) << FE_EXCEPT_SHIFT); + temp |= (*flagp & excepts & FE_ALL_EXCEPT) << FE_EXCEPT_SHIFT; + + /* Save state back to the FPU. */ + _FPU_SETCW(temp); +} diff --git a/sysdeps/arm/fpu/ftestexcept.c b/sysdeps/arm/fpu/ftestexcept.c new file mode 100644 index 0000000..691d3e1 --- /dev/null +++ b/sysdeps/arm/fpu/ftestexcept.c @@ -0,0 +1,32 @@ +/* Test exception in current environment. + Copyright (C) 1997, 1998 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. */ + +#include <fenv.h> +#include <fpu_control.h> + +int +fetestexcept (int excepts) +{ + fexcept_t temp; + + /* Get current exceptions. */ + _FPU_GETCW(temp); + + return temp & excepts & FE_ALL_EXCEPT; +} diff --git a/sysdeps/arm/fpu_control.h b/sysdeps/arm/fpu_control.h index 054085d..8a2d338 100644 --- a/sysdeps/arm/fpu_control.h +++ b/sysdeps/arm/fpu_control.h @@ -1,5 +1,5 @@ -/* FPU control word definitions. Stub version. - Copyright (C) 1996, 1997 Free Software Foundation, Inc. +/* FPU control word definitions. ARM version. + Copyright (C) 1996, 1997, 1998 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 @@ -20,7 +20,54 @@ #ifndef _FPU_CONTROL_H #define _FPU_CONTROL_H -#define _FPU_RESERVED 0xffffffff /* These bits are reserved. */ +/* We have a slight terminology confusion here. On the ARM, the register + * we're interested in is actually the FPU status word - the FPU control + * word is something different (which is implementation-defined and only + * accessible from supervisor mode.) + * + * The FPSR looks like this: + * + * 31-24 23-16 15-8 7-0 + * | system ID | trap enable | system control | exception flags | + * + * We ignore the system ID bits; for interest's sake they are: + * + * 0000 "old" FPE + * 1000 FPPC hardware + * 0001 FPE 400 + * 1001 FPA hardware + * + * The trap enable and exception flags are both structured like this: + * + * 7 - 5 4 3 2 1 0 + * | reserved | INX | UFL | OFL | DVZ | IVO | + * + * where a `1' bit in the enable byte means that the trap can occur, and + * a `1' bit in the flags byte means the exception has occurred. + * + * The exceptions are: + * + * IVO - invalid operation + * DVZ - divide by zero + * OFL - overflow + * UFL - underflow + * INX - inexact (do not use; implementations differ) + * + * The system control byte looks like this: + * + * 7-5 4 3 2 1 0 + * | reserved | AC | EP | SO | NE | ND | + * + * where the bits mean + * + * ND - no denormalised numbers (force them all to zero) + * NE - enable NaN exceptions + * SO - synchronous operation + * EP - use expanded packed-decimal format + * AC - use alternate definition for C flag on compare operations + */ + +#define _FPU_RESERVED 0xfff0e0f0 /* These bits are reserved. */ /* The fdlibm code requires no interrupts for exceptions. Don't change the rounding mode, it would break long double I/O! */ @@ -29,11 +76,9 @@ /* Type of the control word. */ typedef unsigned int fpu_control_t; -/* Macros for accessing the hardware control word. - * On the ARM, we can't do this from user mode (it would trap). - */ -#define _FPU_GETCW(cw) __asm__ ("movnv r0,r0" : "=g" (cw)) -#define _FPU_SETCW(cw) __asm__ ("movnv r0,r0" : : "g" (cw)) +/* Macros for accessing the hardware control word. */ +#define _FPU_GETCW(cw) __asm__ ("rfs %0" : "=r" (cw)) +#define _FPU_SETCW(cw) __asm__ ("wfs %0" : : "r" (cw)) /* Default control word set at startup. */ extern fpu_control_t __fpu_control; |