mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-11-01 17:08:10 +00:00
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>
167 lines
4 KiB
C
167 lines
4 KiB
C
/*
|
|
NetWinder Floating Point Emulator
|
|
(c) Rebel.COM, 1998,1999
|
|
|
|
Direct questions, comments to Scott Bambrough <scottb@netwinder.org>
|
|
|
|
This program is free software; you can redistribute it and/or modify
|
|
it under the terms of the GNU General Public License as published by
|
|
the Free Software Foundation; either version 2 of the License, or
|
|
(at your option) any later version.
|
|
|
|
This program 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 General Public License for more details.
|
|
|
|
You should have received a copy of the GNU General Public License
|
|
along with this program; if not, write to the Free Software
|
|
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
|
|
*/
|
|
|
|
#include "fpa11.h"
|
|
#include "softfloat.h"
|
|
#include "fpopcode.h"
|
|
|
|
union float64_components {
|
|
float64 f64;
|
|
unsigned int i[2];
|
|
};
|
|
|
|
float64 float64_exp(float64 Fm);
|
|
float64 float64_ln(float64 Fm);
|
|
float64 float64_sin(float64 rFm);
|
|
float64 float64_cos(float64 rFm);
|
|
float64 float64_arcsin(float64 rFm);
|
|
float64 float64_arctan(float64 rFm);
|
|
float64 float64_log(float64 rFm);
|
|
float64 float64_tan(float64 rFm);
|
|
float64 float64_arccos(float64 rFm);
|
|
float64 float64_pow(float64 rFn, float64 rFm);
|
|
float64 float64_pol(float64 rFn, float64 rFm);
|
|
|
|
static float64 float64_rsf(struct roundingData *roundData, float64 rFn, float64 rFm)
|
|
{
|
|
return float64_sub(roundData, rFm, rFn);
|
|
}
|
|
|
|
static float64 float64_rdv(struct roundingData *roundData, float64 rFn, float64 rFm)
|
|
{
|
|
return float64_div(roundData, rFm, rFn);
|
|
}
|
|
|
|
static float64 (*const dyadic_double[16])(struct roundingData*, float64 rFn, float64 rFm) = {
|
|
[ADF_CODE >> 20] = float64_add,
|
|
[MUF_CODE >> 20] = float64_mul,
|
|
[SUF_CODE >> 20] = float64_sub,
|
|
[RSF_CODE >> 20] = float64_rsf,
|
|
[DVF_CODE >> 20] = float64_div,
|
|
[RDF_CODE >> 20] = float64_rdv,
|
|
[RMF_CODE >> 20] = float64_rem,
|
|
|
|
/* strictly, these opcodes should not be implemented */
|
|
[FML_CODE >> 20] = float64_mul,
|
|
[FDV_CODE >> 20] = float64_div,
|
|
[FRD_CODE >> 20] = float64_rdv,
|
|
};
|
|
|
|
static float64 float64_mvf(struct roundingData *roundData,float64 rFm)
|
|
{
|
|
return rFm;
|
|
}
|
|
|
|
static float64 float64_mnf(struct roundingData *roundData,float64 rFm)
|
|
{
|
|
union float64_components u;
|
|
|
|
u.f64 = rFm;
|
|
#ifdef __ARMEB__
|
|
u.i[0] ^= 0x80000000;
|
|
#else
|
|
u.i[1] ^= 0x80000000;
|
|
#endif
|
|
|
|
return u.f64;
|
|
}
|
|
|
|
static float64 float64_abs(struct roundingData *roundData,float64 rFm)
|
|
{
|
|
union float64_components u;
|
|
|
|
u.f64 = rFm;
|
|
#ifdef __ARMEB__
|
|
u.i[0] &= 0x7fffffff;
|
|
#else
|
|
u.i[1] &= 0x7fffffff;
|
|
#endif
|
|
|
|
return u.f64;
|
|
}
|
|
|
|
static float64 (*const monadic_double[16])(struct roundingData *, float64 rFm) = {
|
|
[MVF_CODE >> 20] = float64_mvf,
|
|
[MNF_CODE >> 20] = float64_mnf,
|
|
[ABS_CODE >> 20] = float64_abs,
|
|
[RND_CODE >> 20] = float64_round_to_int,
|
|
[URD_CODE >> 20] = float64_round_to_int,
|
|
[SQT_CODE >> 20] = float64_sqrt,
|
|
[NRM_CODE >> 20] = float64_mvf,
|
|
};
|
|
|
|
unsigned int DoubleCPDO(struct roundingData *roundData, const unsigned int opcode, FPREG * rFd)
|
|
{
|
|
FPA11 *fpa11 = GET_FPA11();
|
|
float64 rFm;
|
|
unsigned int Fm, opc_mask_shift;
|
|
|
|
Fm = getFm(opcode);
|
|
if (CONSTANT_FM(opcode)) {
|
|
rFm = getDoubleConstant(Fm);
|
|
} else {
|
|
switch (fpa11->fType[Fm]) {
|
|
case typeSingle:
|
|
rFm = float32_to_float64(fpa11->fpreg[Fm].fSingle);
|
|
break;
|
|
|
|
case typeDouble:
|
|
rFm = fpa11->fpreg[Fm].fDouble;
|
|
break;
|
|
|
|
default:
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
opc_mask_shift = (opcode & MASK_ARITHMETIC_OPCODE) >> 20;
|
|
if (!MONADIC_INSTRUCTION(opcode)) {
|
|
unsigned int Fn = getFn(opcode);
|
|
float64 rFn;
|
|
|
|
switch (fpa11->fType[Fn]) {
|
|
case typeSingle:
|
|
rFn = float32_to_float64(fpa11->fpreg[Fn].fSingle);
|
|
break;
|
|
|
|
case typeDouble:
|
|
rFn = fpa11->fpreg[Fn].fDouble;
|
|
break;
|
|
|
|
default:
|
|
return 0;
|
|
}
|
|
|
|
if (dyadic_double[opc_mask_shift]) {
|
|
rFd->fDouble = dyadic_double[opc_mask_shift](roundData, rFn, rFm);
|
|
} else {
|
|
return 0;
|
|
}
|
|
} else {
|
|
if (monadic_double[opc_mask_shift]) {
|
|
rFd->fDouble = monadic_double[opc_mask_shift](roundData, rFm);
|
|
} else {
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
return 1;
|
|
}
|