f148af2593
Patch from Richard Purdie NWFPE used global variables which meant it wasn't safe for use with preemptive kernels. This patch removes them and communicates the information between functions in a preempt safe manner. Generation of some exceptions was broken and this has also been corrected. Tests with glibc's maths test suite show no change in the results before/after this patch. Signed-off-by: Richard Purdie <rpurdie@rpsys.net> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
98 lines
3 KiB
C
98 lines
3 KiB
C
/*
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NetWinder Floating Point Emulator
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(c) Rebel.com, 1998-1999
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Direct questions, comments to Scott Bambrough <scottb@netwinder.org>
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program 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
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#ifndef __FPA11_H__
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#define __FPA11_H__
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#define GET_FPA11() ((FPA11 *)(¤t_thread_info()->fpstate))
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/*
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* The processes registers are always at the very top of the 8K
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* stack+task struct. Use the same method as 'current' uses to
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* reach them.
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*/
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#define GET_USERREG() ((struct pt_regs *)(THREAD_START_SP + (unsigned long)current_thread_info()) - 1)
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#include <linux/config.h>
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#include <linux/thread_info.h>
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/* includes */
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#include "fpsr.h" /* FP control and status register definitions */
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#include "milieu.h"
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struct roundingData {
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int8 mode;
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int8 precision;
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signed char exception;
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};
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#include "softfloat.h"
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#define typeNone 0x00
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#define typeSingle 0x01
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#define typeDouble 0x02
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#define typeExtended 0x03
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/*
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* This must be no more and no less than 12 bytes.
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*/
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typedef union tagFPREG {
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float32 fSingle;
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float64 fDouble;
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#ifdef CONFIG_FPE_NWFPE_XP
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floatx80 fExtended;
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#else
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int padding[3];
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#endif
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} FPREG;
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/*
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* FPA11 device model.
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*
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* This structure is exported to user space. Do not re-order.
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* Only add new stuff to the end, and do not change the size of
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* any element. Elements of this structure are used by user
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* space, and must match struct user_fp in include/asm-arm/user.h.
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* We include the byte offsets below for documentation purposes.
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*
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* The size of this structure and FPREG are checked by fpmodule.c
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* on initialisation. If the rules have been broken, NWFPE will
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* not initialise.
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*/
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typedef struct tagFPA11 {
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/* 0 */ FPREG fpreg[8]; /* 8 floating point registers */
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/* 96 */ FPSR fpsr; /* floating point status register */
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/* 100 */ FPCR fpcr; /* floating point control register */
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/* 104 */ unsigned char fType[8]; /* type of floating point value held in
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floating point registers. One of
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none, single, double or extended. */
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/* 112 */ int initflag; /* this is special. The kernel guarantees
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to set it to 0 when a thread is launched,
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so we can use it to detect whether this
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instance of the emulator needs to be
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initialised. */
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} FPA11;
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extern int8 SetRoundingMode(const unsigned int);
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extern int8 SetRoundingPrecision(const unsigned int);
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extern void nwfpe_init_fpa(union fp_state *fp);
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#endif
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