mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-17 18:40:14 +00:00
cb0509a8d5
1998-11-26 Ulrich Drepper <drepper@cygnus.com> * sysdeps/mips/dl-machine.h (ELF_MACHINE_NO_PLT): New defined macro. (elf_machine_got_rel): Remove scope variable. Use scope from the map. Don't modify _dl_global_scope_end in the end. (__dl_runtime_resolv): Also use scope from the map. * sysdeps/mips/mips64/dl-machine.h: Likewise. * elf/dl-runtime.c: Don't define fixup and profile_fixup if ELF_MACHINE_NO_PLT is defined. * sysdeps/mips/sys/ucontext.h: New file. Patches by kaz Kojima <kkojima@rr.iij4u.or.jp>. 1998-11-26 Andreas Jaeger <aj@arthur.rhein-neckar.de> * sysdeps/generic/pselect.c (__pselect): Change interface, set/restore sigmask. * misc/sys/select.h: Change declaration according to Stevens' Unix Network Programming. * include/sys/select.h (__pselect): Likewise. Reported by <bwelling@anomaly.munge.com> [PR libc/872]. * include/fpu_control.h: New file, contains __setfpucw declaration. * sysdeps/generic/fpu_control.h: Remove __setfpucw declaration, it's an internal symbol. * sysdeps/alpha/fpu/fpu_control.h: Likewise. * sysdeps/arm/fpu/fpu_control.h: Likewise. * sysdeps/i386/fpu_control.h: Likewise. * sysdeps/m68k/fpu_control.h: Likewise. * sysdeps/powerpc/fpu_control.h: Likewise. * sysdeps/sparc/sparc32/fpu/fpu_control.h: Likewise. * sysdeps/sparc/sparc64/fpu/fpu_control.h: Likewise.
87 lines
3.0 KiB
C
87 lines
3.0 KiB
C
/* 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
|
|
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 _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
|
|
*/
|
|
|
|
#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! */
|
|
#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) __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 */
|