diff options
Diffstat (limited to 'libc/sysdeps/linux')
| -rw-r--r-- | libc/sysdeps/linux/alpha/Makefile | 1 | ||||
| -rw-r--r-- | libc/sysdeps/linux/alpha/fpu_control.h | 106 | ||||
| -rw-r--r-- | libc/sysdeps/linux/arm/Makefile | 1 | ||||
| -rw-r--r-- | libc/sysdeps/linux/arm/fpu_control.h | 102 | ||||
| -rw-r--r-- | libc/sysdeps/linux/common/Makefile | 5 | ||||
| -rw-r--r-- | libc/sysdeps/linux/common/fpu_control.h | 39 | ||||
| -rw-r--r-- | libc/sysdeps/linux/i386/Makefile | 1 | ||||
| -rw-r--r-- | libc/sysdeps/linux/i386/fpu_control.h | 98 | ||||
| -rw-r--r-- | libc/sysdeps/linux/m68k/Makefile | 1 | ||||
| -rw-r--r-- | libc/sysdeps/linux/m68k/fpu_control.h | 69 | ||||
| -rw-r--r-- | libc/sysdeps/linux/mips/Makefile | 1 | ||||
| -rw-r--r-- | libc/sysdeps/linux/mips/fpu_control.h | 98 | ||||
| -rw-r--r-- | libc/sysdeps/linux/powerpc/Makefile | 2 | ||||
| -rw-r--r-- | libc/sysdeps/linux/powerpc/fpu_control.h | 69 | ||||
| -rw-r--r-- | libc/sysdeps/linux/sh/Makefile | 1 | ||||
| -rw-r--r-- | libc/sysdeps/linux/sh/fpu_control.h | 56 | ||||
| -rw-r--r-- | libc/sysdeps/linux/sparc/Makefile | 1 | ||||
| -rw-r--r-- | libc/sysdeps/linux/sparc/fpu_control.h | 73 |
18 files changed, 722 insertions, 2 deletions
diff --git a/libc/sysdeps/linux/alpha/Makefile b/libc/sysdeps/linux/alpha/Makefile index c94c9751f..85c530999 100644 --- a/libc/sysdeps/linux/alpha/Makefile +++ b/libc/sysdeps/linux/alpha/Makefile @@ -54,6 +54,7 @@ $(COBJS): %.o : %.c $(STRIPTOOL) -x -R .note -R .comment $*.o headers: + cd $(TOPDIR)/include && ln -fs ../libc/sysdeps/linux/alpha/fpu_control.h . clean: diff --git a/libc/sysdeps/linux/alpha/fpu_control.h b/libc/sysdeps/linux/alpha/fpu_control.h new file mode 100644 index 000000000..28acdf170 --- /dev/null +++ b/libc/sysdeps/linux/alpha/fpu_control.h @@ -0,0 +1,106 @@ +/* FPU control word bits. Alpha-mapped-to-Intel version. + Copyright (C) 1996, 1998, 2000, 2002 Free Software Foundation, Inc. + This file is part of the GNU C Library. + Contributed by Olaf Flebbe. + + 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 _ALPHA_FPU_CONTROL_H +#define _ALPHA_FPU_CONTROL_H + +/* + * Since many programs seem to hardcode the values passed to __setfpucw() + * (rather than using the manifest constants) we emulate the x87 interface + * here (at least where this makes sense). + * + * 15-13 12 11-10 9-8 7-6 5 4 3 2 1 0 + * | reserved | IC | RC | PC | reserved | PM | UM | OM | ZM | DM | IM + * + * IM: Invalid operation mask + * DM: Denormalized operand mask + * ZM: Zero-divide mask + * OM: Overflow mask + * UM: Underflow mask + * PM: Precision (inexact result) mask + * + * Mask bit is 1 means no interrupt. + * + * PC: Precision control + * 11 - round to extended precision + * 10 - round to double precision + * 00 - round to single precision + * + * RC: Rounding control + * 00 - rounding to nearest + * 01 - rounding down (toward - infinity) + * 10 - rounding up (toward + infinity) + * 11 - rounding toward zero + * + * IC: Infinity control + * That is for 8087 and 80287 only. + * + * The hardware default is 0x037f. I choose 0x1372. + */ + +#include <features.h> + +/* masking of interrupts */ +#define _FPU_MASK_IM 0x01 +#define _FPU_MASK_DM 0x02 +#define _FPU_MASK_ZM 0x04 +#define _FPU_MASK_OM 0x08 +#define _FPU_MASK_UM 0x10 +#define _FPU_MASK_PM 0x20 + +/* precision control -- without effect on Alpha */ +#define _FPU_EXTENDED 0x300 /* RECOMMENDED */ +#define _FPU_DOUBLE 0x200 +#define _FPU_SINGLE 0x0 /* DO NOT USE */ + +/* + * rounding control---notice that on the Alpha this affects only + * instructions with the dynamic rounding mode qualifier (/d). + */ +#define _FPU_RC_NEAREST 0x000 /* RECOMMENDED */ +#define _FPU_RC_DOWN 0x400 +#define _FPU_RC_UP 0x800 +#define _FPU_RC_ZERO 0xC00 + +#define _FPU_RESERVED 0xF0C0 /* Reserved bits in cw */ + + +/* Now two recommended cw */ + +/* Linux default: + - extended precision + - rounding to positive infinity. There is no /p instruction + qualifier. By setting the dynamic rounding mode to +infinity, + one can use /d to get round to +infinity with no extra overhead + (so long as the default isn't changed, of course...) + - no exceptions enabled. */ + +#define _FPU_DEFAULT 0x137f + +/* IEEE: same as above. */ +#define _FPU_IEEE 0x137f + +/* Type of the control word. */ +typedef unsigned int fpu_control_t; + +/* Default control word set at startup. */ +extern fpu_control_t __fpu_control; + +#endif /* _ALPHA_FPU_CONTROL */ diff --git a/libc/sysdeps/linux/arm/Makefile b/libc/sysdeps/linux/arm/Makefile index beed16b23..038b994a2 100644 --- a/libc/sysdeps/linux/arm/Makefile +++ b/libc/sysdeps/linux/arm/Makefile @@ -62,6 +62,7 @@ gcrt1.o: $(CRT0_DEPS) endif headers: + cd $(TOPDIR)/include && ln -fs ../libc/sysdeps/linux/arm/fpu_control.h . clean: diff --git a/libc/sysdeps/linux/arm/fpu_control.h b/libc/sysdeps/linux/arm/fpu_control.h new file mode 100644 index 000000000..65912e496 --- /dev/null +++ b/libc/sysdeps/linux/arm/fpu_control.h @@ -0,0 +1,102 @@ +/* FPU control word definitions. ARM version. + Copyright (C) 1996, 1997, 1998, 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 _FPU_CONTROL_H +#define _FPU_CONTROL_H + +/* 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 + */ + +/* masking of interrupts */ +#define _FPU_MASK_IM 0x00010000 /* invalid operation */ +#define _FPU_MASK_ZM 0x00020000 /* divide by zero */ +#define _FPU_MASK_OM 0x00040000 /* overflow */ +#define _FPU_MASK_UM 0x00080000 /* underflow */ +#define _FPU_MASK_PM 0x00100000 /* inexact */ +#define _FPU_MASK_DM 0x00000000 /* denormalized operation */ + +/* The system id bytes cannot be changed. + Only the bottom 5 bits in the trap enable byte can be changed. + Only the bottom 5 bits in the system control byte can be changed. + Only the bottom 5 bits in the exception flags are used. + The exception flags are set by the fpu, but can be zeroed by the user. */ +#define _FPU_RESERVED 0xffe0e0e0 /* These bits are reserved. */ + +/* The fdlibm code requires strict IEEE double precision arithmetic, + no interrupts for exceptions, rounding to nearest. Changing the + rounding mode will break long double I/O. Turn on the AC bit, + the compiler generates code that assumes it is on. */ +#define _FPU_DEFAULT 0x00001000 /* Default value. */ +#define _FPU_IEEE 0x001f1000 /* Default + exceptions enabled. */ + +/* Type of the control word. */ +typedef unsigned int fpu_control_t; + +/* 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; + +#endif /* _FPU_CONTROL_H */ diff --git a/libc/sysdeps/linux/common/Makefile b/libc/sysdeps/linux/common/Makefile index 5323df366..8bff24f2e 100644 --- a/libc/sysdeps/linux/common/Makefile +++ b/libc/sysdeps/linux/common/Makefile @@ -54,7 +54,7 @@ endif OBJ=$(COBJS) $(MOBJ) -all: $(STR_SYSCALLS) $(OBJ) $(LIBC) +all: $(STR_SYSCALLS) $(OBJ) $(LIBC) headers $(LIBC): ar-target @@ -98,6 +98,9 @@ $(TOPDIR)lib/crtn.o: $(AR) $(ARFLAGS) $(TOPDIR)lib/crtn.o endif +headers: + cd $(TOPDIR)/include && ln -fs ../libc/sysdeps/linux/common/fpu_control.h . + clean: rm -f *.[oa] *~ core crt[in].* *.S diff --git a/libc/sysdeps/linux/common/fpu_control.h b/libc/sysdeps/linux/common/fpu_control.h new file mode 100644 index 000000000..4a1b07d23 --- /dev/null +++ b/libc/sysdeps/linux/common/fpu_control.h @@ -0,0 +1,39 @@ +/* FPU control word definitions. Stub 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 + 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 _FPU_CONTROL_H +#define _FPU_CONTROL_H + +#define _FPU_RESERVED 0xffffffff /* These bits are reserved and not changed. */ + +/* The fdlibm code requires no interrupts for exceptions. Don't + change the rounding mode, it would break long double I/O! */ +#define _FPU_DEFAULT 0x00000000 /* Default value. */ + +/* Type of the control word. */ +typedef unsigned int fpu_control_t; + +/* Macros for accessing the hardware control word. */ +#define _FPU_GETCW(cw) 0 +#define _FPU_SETCW(cw) do { } while (0) + +/* Default control word set at startup. */ +extern fpu_control_t __fpu_control; + +#endif /* _FPU_CONTROL_H */ diff --git a/libc/sysdeps/linux/i386/Makefile b/libc/sysdeps/linux/i386/Makefile index 11df4cbb0..2f721eb6e 100644 --- a/libc/sysdeps/linux/i386/Makefile +++ b/libc/sysdeps/linux/i386/Makefile @@ -65,6 +65,7 @@ gcrt1.o: $(CRT0_DEPS) endif headers: + cd $(TOPDIR)/include && ln -fs ../libc/sysdeps/linux/i386/fpu_control.h . clean: diff --git a/libc/sysdeps/linux/i386/fpu_control.h b/libc/sysdeps/linux/i386/fpu_control.h new file mode 100644 index 000000000..ed9bf388a --- /dev/null +++ b/libc/sysdeps/linux/i386/fpu_control.h @@ -0,0 +1,98 @@ +/* FPU control word bits. i387 version. + Copyright (C) 1993,1995,1996,1997,1998,2000,2001 Free Software Foundation, Inc. + This file is part of the GNU C Library. + Contributed by Olaf Flebbe. + + 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 _FPU_CONTROL_H +#define _FPU_CONTROL_H 1 + +/* Here is the dirty part. Set up your 387 through the control word + * (cw) register. + * + * 15-13 12 11-10 9-8 7-6 5 4 3 2 1 0 + * | reserved | IC | RC | PC | reserved | PM | UM | OM | ZM | DM | IM + * + * IM: Invalid operation mask + * DM: Denormalized operand mask + * ZM: Zero-divide mask + * OM: Overflow mask + * UM: Underflow mask + * PM: Precision (inexact result) mask + * + * Mask bit is 1 means no interrupt. + * + * PC: Precision control + * 11 - round to extended precision + * 10 - round to double precision + * 00 - round to single precision + * + * RC: Rounding control + * 00 - rounding to nearest + * 01 - rounding down (toward - infinity) + * 10 - rounding up (toward + infinity) + * 11 - rounding toward zero + * + * IC: Infinity control + * That is for 8087 and 80287 only. + * + * The hardware default is 0x037f which we use. + */ + +#include <features.h> + +/* masking of interrupts */ +#define _FPU_MASK_IM 0x01 +#define _FPU_MASK_DM 0x02 +#define _FPU_MASK_ZM 0x04 +#define _FPU_MASK_OM 0x08 +#define _FPU_MASK_UM 0x10 +#define _FPU_MASK_PM 0x20 + +/* precision control */ +#define _FPU_EXTENDED 0x300 /* libm requires double extended precision. */ +#define _FPU_DOUBLE 0x200 +#define _FPU_SINGLE 0x0 + +/* rounding control */ +#define _FPU_RC_NEAREST 0x0 /* RECOMMENDED */ +#define _FPU_RC_DOWN 0x400 +#define _FPU_RC_UP 0x800 +#define _FPU_RC_ZERO 0xC00 + +#define _FPU_RESERVED 0xF0C0 /* Reserved bits in cw */ + + +/* The fdlibm code requires strict IEEE double precision arithmetic, + and no interrupts for exceptions, rounding to nearest. */ + +#define _FPU_DEFAULT 0x037f + +/* IEEE: same as above. */ +#define _FPU_IEEE 0x037f + +/* Type of the control word. */ +typedef unsigned int fpu_control_t __attribute__ ((__mode__ (__HI__))); + +/* Macros for accessing the hardware control word. */ +#define _FPU_GETCW(cw) __asm__ ("fnstcw %0" : "=m" (*&cw)) +#define _FPU_SETCW(cw) __asm__ ("fldcw %0" : : "m" (*&cw)) + +/* Default control word set at startup. */ +extern fpu_control_t __fpu_control; + +#endif /* fpu_control.h */ diff --git a/libc/sysdeps/linux/m68k/Makefile b/libc/sysdeps/linux/m68k/Makefile index a98352198..7369bc925 100644 --- a/libc/sysdeps/linux/m68k/Makefile +++ b/libc/sysdeps/linux/m68k/Makefile @@ -65,6 +65,7 @@ ifneq ($(strip $(HAVE_ELF)),y) echo "Working around compiler bug in the m68k-pic-coff toolchain" cd $(TOPDIR)/include && ln -fs ../libc/sysdeps/linux/m68k/float.h . endif + cd $(TOPDIR)/include && ln -fs ../libc/sysdeps/linux/m68k/fpu_control.h . clean: diff --git a/libc/sysdeps/linux/m68k/fpu_control.h b/libc/sysdeps/linux/m68k/fpu_control.h new file mode 100644 index 000000000..1b2ba87c9 --- /dev/null +++ b/libc/sysdeps/linux/m68k/fpu_control.h @@ -0,0 +1,69 @@ +/* FPU control word definitions. PowerPC 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 + 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 _FPU_CONTROL_H +#define _FPU_CONTROL_H + +/* rounding control */ +#define _FPU_RC_NEAREST 0x00 /* RECOMMENDED */ +#define _FPU_RC_DOWN 0x03 +#define _FPU_RC_UP 0x02 +#define _FPU_RC_ZERO 0x01 + +#define _FPU_MASK_NI 0x04 /* non-ieee mode */ + +/* masking of interrupts */ +#define _FPU_MASK_ZM 0x10 /* zero divide */ +#define _FPU_MASK_OM 0x40 /* overflow */ +#define _FPU_MASK_UM 0x20 /* underflow */ +#define _FPU_MASK_XM 0x08 /* inexact */ +#define _FPU_MASK_IM 0x80 /* invalid operation */ + +#define _FPU_RESERVED 0xffffff00 /* These bits are reserved are not changed. */ + +/* The fdlibm code requires no interrupts for exceptions. */ +#define _FPU_DEFAULT 0x00000000 /* Default value. */ + +/* IEEE: same as above, but (some) exceptions; + we leave the 'inexact' exception off. + */ +#define _FPU_IEEE 0x000000f0 + +/* Type of the control word. */ +typedef unsigned int fpu_control_t __attribute__ ((__mode__ (__SI__))); + +/* Macros for accessing the hardware control word. */ +#define _FPU_GETCW(__cw) ( { \ + union { double d; fpu_control_t cw[2]; } \ + tmp __attribute__ ((__aligned__(8))); \ + __asm__ ("mffs 0; stfd%U0 0,%0" : "=m" (tmp.d) : : "fr0"); \ + (__cw)=tmp.cw[1]; \ + tmp.cw[1]; } ) +#define _FPU_SETCW(__cw) { \ + union { double d; fpu_control_t cw[2]; } \ + tmp __attribute__ ((__aligned__(8))); \ + tmp.cw[0] = 0xFFF80000; /* More-or-less arbitrary; this is a QNaN. */ \ + tmp.cw[1] = __cw; \ + __asm__ ("lfd%U0 0,%0; mtfsf 255,0" : : "m" (tmp.d) : "fr0"); \ +} + +/* Default control word set at startup. */ +extern fpu_control_t __fpu_control; + +#endif /* _FPU_CONTROL_H */ diff --git a/libc/sysdeps/linux/mips/Makefile b/libc/sysdeps/linux/mips/Makefile index eaeff33b7..a226a8466 100644 --- a/libc/sysdeps/linux/mips/Makefile +++ b/libc/sysdeps/linux/mips/Makefile @@ -55,6 +55,7 @@ $(COBJS): %.o : %.c headers: cd $(TOPDIR)/include && ln -fs ../libc/sysdeps/linux/mips/sgidefs.h . # cd $(TOPDIR)/include && ln -fs ../libc/sysdeps/linux/mips/regdef.h . + cd $(TOPDIR)/include && ln -fs ../libc/sysdeps/linux/mips/fpu_control.h . clean: rm -f *.[oa] *~ core diff --git a/libc/sysdeps/linux/mips/fpu_control.h b/libc/sysdeps/linux/mips/fpu_control.h new file mode 100644 index 000000000..da18deab5 --- /dev/null +++ b/libc/sysdeps/linux/mips/fpu_control.h @@ -0,0 +1,98 @@ +/* FPU control word bits. Mips version. + Copyright (C) 1996, 1997, 1998, 1999, 2000 Free Software Foundation, Inc. + This file is part of the GNU C Library. + Contributed by Olaf Flebbe and Ralf Baechle. + + 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 _FPU_CONTROL_H +#define _FPU_CONTROL_H + +/* MIPS FPU floating point control register bits. + * + * 31-25 -> floating point conditions code bits 7-1. These bits are only + * available in MIPS IV. + * 24 -> flush denormalized results to zero instead of + * causing unimplemented operation exception. This bit is only + * available for MIPS III and newer. + * 23 -> Condition bit + * 22-18 -> reserved (read as 0, write with 0) + * 17 -> cause bit for unimplemented operation + * 16 -> cause bit for invalid exception + * 15 -> cause bit for division by zero exception + * 14 -> cause bit for overflow exception + * 13 -> cause bit for underflow exception + * 12 -> cause bit for inexact exception + * 11 -> enable exception for invalid exception + * 10 -> enable exception for division by zero exception + * 9 -> enable exception for overflow exception + * 8 -> enable exception for underflow exception + * 7 -> enable exception for inexact exception + * 6 -> flag invalid exception + * 5 -> flag division by zero exception + * 4 -> flag overflow exception + * 3 -> flag underflow exception + * 2 -> flag inexact exception + * 1-0 -> rounding control + * + * + * Rounding Control: + * 00 - rounding to nearest (RN) + * 01 - rounding toward zero (RZ) + * 10 - rounding (up) toward plus infinity (RP) + * 11 - rounding (down)toward minus infinity (RM) + */ + +#include <features.h> + +/* masking of interrupts */ +#define _FPU_MASK_V 0x0800 /* Invalid operation */ +#define _FPU_MASK_Z 0x0400 /* Division by zero */ +#define _FPU_MASK_O 0x0200 /* Overflow */ +#define _FPU_MASK_U 0x0100 /* Underflow */ +#define _FPU_MASK_I 0x0080 /* Inexact operation */ + +/* flush denormalized numbers to zero */ +#define _FPU_FLUSH_TZ 0x1000000 + +/* rounding control */ +#define _FPU_RC_NEAREST 0x0 /* RECOMMENDED */ +#define _FPU_RC_ZERO 0x1 +#define _FPU_RC_UP 0x2 +#define _FPU_RC_DOWN 0x3 + +#define _FPU_RESERVED 0xfe3c0000 /* Reserved bits in cw */ + + +/* The fdlibm code requires strict IEEE double precision arithmetic, + and no interrupts for exceptions, rounding to nearest. */ + +#define _FPU_DEFAULT 0x00000000 + +/* IEEE: same as above, but exceptions */ +#define _FPU_IEEE 0x00000F80 + +/* Type of the control word. */ +typedef unsigned int fpu_control_t __attribute__ ((__mode__ (__SI__))); + +/* Macros for accessing the hardware control word. */ +#define _FPU_GETCW(cw) __asm__ ("cfc1 %0,$31" : "=r" (cw)) +#define _FPU_SETCW(cw) __asm__ ("ctc1 %0,$31" : : "r" (cw)) + +/* Default control word set at startup. */ +extern fpu_control_t __fpu_control; + +#endif /* fpu_control.h */ diff --git a/libc/sysdeps/linux/powerpc/Makefile b/libc/sysdeps/linux/powerpc/Makefile index c1cd0055c..e9798cf7b 100644 --- a/libc/sysdeps/linux/powerpc/Makefile +++ b/libc/sysdeps/linux/powerpc/Makefile @@ -65,7 +65,7 @@ gcrt1.o: $(CRT0_DEPS) endif headers: - + cd $(TOPDIR)/include && ln -fs ../libc/sysdeps/linux/powerpc/fpu_control.h . clean: rm -f *.[oa] *~ core diff --git a/libc/sysdeps/linux/powerpc/fpu_control.h b/libc/sysdeps/linux/powerpc/fpu_control.h new file mode 100644 index 000000000..1b2ba87c9 --- /dev/null +++ b/libc/sysdeps/linux/powerpc/fpu_control.h @@ -0,0 +1,69 @@ +/* FPU control word definitions. PowerPC 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 + 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 _FPU_CONTROL_H +#define _FPU_CONTROL_H + +/* rounding control */ +#define _FPU_RC_NEAREST 0x00 /* RECOMMENDED */ +#define _FPU_RC_DOWN 0x03 +#define _FPU_RC_UP 0x02 +#define _FPU_RC_ZERO 0x01 + +#define _FPU_MASK_NI 0x04 /* non-ieee mode */ + +/* masking of interrupts */ +#define _FPU_MASK_ZM 0x10 /* zero divide */ +#define _FPU_MASK_OM 0x40 /* overflow */ +#define _FPU_MASK_UM 0x20 /* underflow */ +#define _FPU_MASK_XM 0x08 /* inexact */ +#define _FPU_MASK_IM 0x80 /* invalid operation */ + +#define _FPU_RESERVED 0xffffff00 /* These bits are reserved are not changed. */ + +/* The fdlibm code requires no interrupts for exceptions. */ +#define _FPU_DEFAULT 0x00000000 /* Default value. */ + +/* IEEE: same as above, but (some) exceptions; + we leave the 'inexact' exception off. + */ +#define _FPU_IEEE 0x000000f0 + +/* Type of the control word. */ +typedef unsigned int fpu_control_t __attribute__ ((__mode__ (__SI__))); + +/* Macros for accessing the hardware control word. */ +#define _FPU_GETCW(__cw) ( { \ + union { double d; fpu_control_t cw[2]; } \ + tmp __attribute__ ((__aligned__(8))); \ + __asm__ ("mffs 0; stfd%U0 0,%0" : "=m" (tmp.d) : : "fr0"); \ + (__cw)=tmp.cw[1]; \ + tmp.cw[1]; } ) +#define _FPU_SETCW(__cw) { \ + union { double d; fpu_control_t cw[2]; } \ + tmp __attribute__ ((__aligned__(8))); \ + tmp.cw[0] = 0xFFF80000; /* More-or-less arbitrary; this is a QNaN. */ \ + tmp.cw[1] = __cw; \ + __asm__ ("lfd%U0 0,%0; mtfsf 255,0" : : "m" (tmp.d) : "fr0"); \ +} + +/* Default control word set at startup. */ +extern fpu_control_t __fpu_control; + +#endif /* _FPU_CONTROL_H */ diff --git a/libc/sysdeps/linux/sh/Makefile b/libc/sysdeps/linux/sh/Makefile index 758d4462d..b4266c9f5 100644 --- a/libc/sysdeps/linux/sh/Makefile +++ b/libc/sysdeps/linux/sh/Makefile @@ -64,6 +64,7 @@ gcrt1.o: $(CRT0_DEPS) endif headers: + cd $(TOPDIR)/include && ln -fs ../libc/sysdeps/linux/sh/fpu_control.h . clean: rm -f *.[oa] *~ core diff --git a/libc/sysdeps/linux/sh/fpu_control.h b/libc/sysdeps/linux/sh/fpu_control.h new file mode 100644 index 000000000..43eb9e549 --- /dev/null +++ b/libc/sysdeps/linux/sh/fpu_control.h @@ -0,0 +1,56 @@ +/* FPU control word definitions. SH version. + Copyright (C) 1999, 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 _FPU_CONTROL_H +#define _FPU_CONTROL_H + +/* masking of interrupts */ +#define _FPU_MASK_VM 0x0800 /* Invalid operation */ +#define _FPU_MASK_ZM 0x0400 /* Division by zero */ +#define _FPU_MASK_OM 0x0200 /* Overflow */ +#define _FPU_MASK_UM 0x0100 /* Underflow */ +#define _FPU_MASK_IM 0x0080 /* Inexact operation */ + +/* rounding control */ +#define _FPU_RC_NEAREST 0x0 /* RECOMMENDED */ +#define _FPU_RC_ZERO 0x1 + +#define _FPU_RESERVED 0xffc00000 /* These bits are reserved. */ + +/* The fdlibm code requires strict IEEE double precision arithmetic, + and no interrupts for exceptions, rounding to nearest. */ +#define _FPU_DEFAULT 0x00080000 /* Default value. */ +#define _FPU_IEEE 0x00080f80 /* Default + exceptions enabled. */ + +/* Type of the control word. */ +typedef unsigned int fpu_control_t; + +/* Macros for accessing the hardware control word. */ +#define _FPU_GETCW(cw) __asm__ ("sts fpscr,%0" : "=r" (cw)) + +#if defined __GNUC__ +#define _FPU_SETCW(cw) __set_fpscr ((cw)) +#else +#define _FPU_SETCW(cw) __asm__ ("lds %0,fpscr" : : "r" (cw)) +#endif + +/* Default control word set at startup. */ +extern fpu_control_t __fpu_control; + +#endif /* _FPU_CONTROL_H */ diff --git a/libc/sysdeps/linux/sparc/Makefile b/libc/sysdeps/linux/sparc/Makefile index 1491cf343..19e9d9394 100644 --- a/libc/sysdeps/linux/sparc/Makefile +++ b/libc/sysdeps/linux/sparc/Makefile @@ -55,6 +55,7 @@ $(COBJS): %.o : %.c $(STRIPTOOL) -x -R .note -R .comment $*.o headers: + cd $(TOPDIR)/include && ln -fs ../libc/sysdeps/linux/sparc/fpu_control.h . clean: rm -f *.[oa] *~ core diff --git a/libc/sysdeps/linux/sparc/fpu_control.h b/libc/sysdeps/linux/sparc/fpu_control.h new file mode 100644 index 000000000..b29734ce2 --- /dev/null +++ b/libc/sysdeps/linux/sparc/fpu_control.h @@ -0,0 +1,73 @@ +/* FPU control word bits. SPARC version. + Copyright (C) 1997, 1998, 1999 Free Software Foundation, Inc. + This file is part of the GNU C Library. + Contributed by Miguel de Icaza + + 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 _FPU_CONTROL_H +#define _FPU_CONTROL_H 1 + + +#include <features.h> +#include <bits/wordsize.h> + +/* masking of interrupts */ +#define _FPU_MASK_IM 0x08000000 +#define _FPU_MASK_OM 0x04000000 +#define _FPU_MASK_UM 0x02000000 +#define _FPU_MASK_ZM 0x01000000 +#define _FPU_MASK_PM 0x00800000 + +/* precision control */ +#define _FPU_EXTENDED 0x00000000 /* RECOMMENDED */ +#define _FPU_DOUBLE 0x20000000 +#define _FPU_80BIT 0x30000000 +#define _FPU_SINGLE 0x10000000 /* DO NOT USE */ + +/* rounding control / Sparc */ +#define _FPU_RC_DOWN 0xc0000000 +#define _FPU_RC_UP 0x80000000 +#define _FPU_RC_ZERO 0x40000000 +#define _FPU_RC_NEAREST 0x0 /* RECOMMENDED */ + +#define _FPU_RESERVED 0x30300000 /* Reserved bits in cw */ + + +/* Now two recommended cw */ + +/* Linux and IEEE default: + - extended precision + - rounding to nearest + - no exceptions */ +#define _FPU_DEFAULT 0x0 +#define _FPU_IEEE 0x0 + +/* Type of the control word. */ +typedef unsigned long int fpu_control_t; + +#if __WORDSIZE == 64 +# define _FPU_GETCW(cw) __asm__ ("stx %%fsr,%0" : "=m" (*&cw)) +# define _FPU_SETCW(cw) __asm__ ("ldx %0,%%fsr" : : "m" (*&cw)) +#else +# define _FPU_GETCW(cw) __asm__ ("st %%fsr,%0" : "=m" (*&cw)) +# define _FPU_SETCW(cw) __asm__ ("ld %0,%%fsr" : : "m" (*&cw)) +#endif + +/* Default control word set at startup. */ +extern fpu_control_t __fpu_control; + +#endif /* fpu_control.h */ |