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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-11-01 00:48:50 +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
/*
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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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#include "fpa11.h"
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#include "softfloat.h"
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#include "fpopcode.h"
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union float64_components {
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float64 f64;
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unsigned int i[2];
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};
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float64 float64_exp(float64 Fm);
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float64 float64_ln(float64 Fm);
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float64 float64_sin(float64 rFm);
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float64 float64_cos(float64 rFm);
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float64 float64_arcsin(float64 rFm);
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float64 float64_arctan(float64 rFm);
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float64 float64_log(float64 rFm);
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float64 float64_tan(float64 rFm);
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float64 float64_arccos(float64 rFm);
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float64 float64_pow(float64 rFn, float64 rFm);
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float64 float64_pol(float64 rFn, float64 rFm);
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static float64 float64_rsf(struct roundingData *roundData, float64 rFn, float64 rFm)
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{
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return float64_sub(roundData, rFm, rFn);
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}
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static float64 float64_rdv(struct roundingData *roundData, float64 rFn, float64 rFm)
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{
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return float64_div(roundData, rFm, rFn);
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}
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static float64 (*const dyadic_double[16])(struct roundingData*, float64 rFn, float64 rFm) = {
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[ADF_CODE >> 20] = float64_add,
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[MUF_CODE >> 20] = float64_mul,
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[SUF_CODE >> 20] = float64_sub,
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[RSF_CODE >> 20] = float64_rsf,
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[DVF_CODE >> 20] = float64_div,
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[RDF_CODE >> 20] = float64_rdv,
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[RMF_CODE >> 20] = float64_rem,
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/* strictly, these opcodes should not be implemented */
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[FML_CODE >> 20] = float64_mul,
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[FDV_CODE >> 20] = float64_div,
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[FRD_CODE >> 20] = float64_rdv,
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};
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static float64 float64_mvf(struct roundingData *roundData,float64 rFm)
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{
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return rFm;
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}
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static float64 float64_mnf(struct roundingData *roundData,float64 rFm)
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{
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union float64_components u;
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u.f64 = rFm;
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#ifdef __ARMEB__
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u.i[0] ^= 0x80000000;
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#else
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u.i[1] ^= 0x80000000;
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#endif
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return u.f64;
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}
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static float64 float64_abs(struct roundingData *roundData,float64 rFm)
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{
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union float64_components u;
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u.f64 = rFm;
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#ifdef __ARMEB__
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u.i[0] &= 0x7fffffff;
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#else
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u.i[1] &= 0x7fffffff;
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#endif
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return u.f64;
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}
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static float64 (*const monadic_double[16])(struct roundingData *, float64 rFm) = {
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[MVF_CODE >> 20] = float64_mvf,
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[MNF_CODE >> 20] = float64_mnf,
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[ABS_CODE >> 20] = float64_abs,
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[RND_CODE >> 20] = float64_round_to_int,
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[URD_CODE >> 20] = float64_round_to_int,
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[SQT_CODE >> 20] = float64_sqrt,
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[NRM_CODE >> 20] = float64_mvf,
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};
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unsigned int DoubleCPDO(struct roundingData *roundData, const unsigned int opcode, FPREG * rFd)
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{
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FPA11 *fpa11 = GET_FPA11();
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float64 rFm;
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unsigned int Fm, opc_mask_shift;
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Fm = getFm(opcode);
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if (CONSTANT_FM(opcode)) {
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rFm = getDoubleConstant(Fm);
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} else {
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switch (fpa11->fType[Fm]) {
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case typeSingle:
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rFm = float32_to_float64(fpa11->fpreg[Fm].fSingle);
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break;
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case typeDouble:
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rFm = fpa11->fpreg[Fm].fDouble;
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break;
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default:
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return 0;
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}
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}
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opc_mask_shift = (opcode & MASK_ARITHMETIC_OPCODE) >> 20;
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if (!MONADIC_INSTRUCTION(opcode)) {
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unsigned int Fn = getFn(opcode);
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float64 rFn;
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switch (fpa11->fType[Fn]) {
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case typeSingle:
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rFn = float32_to_float64(fpa11->fpreg[Fn].fSingle);
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break;
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case typeDouble:
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rFn = fpa11->fpreg[Fn].fDouble;
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break;
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default:
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return 0;
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}
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if (dyadic_double[opc_mask_shift]) {
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rFd->fDouble = dyadic_double[opc_mask_shift](roundData, rFn, rFm);
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} else {
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return 0;
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}
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} else {
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if (monadic_double[opc_mask_shift]) {
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rFd->fDouble = monadic_double[opc_mask_shift](roundData, rFm);
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} else {
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return 0;
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}
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}
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return 1;
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}
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