diff options
Diffstat (limited to 'arch/arm26/nwfpe/fpa11.c')
| -rw-r--r-- | arch/arm26/nwfpe/fpa11.c | 221 |
1 files changed, 0 insertions, 221 deletions
diff --git a/arch/arm26/nwfpe/fpa11.c b/arch/arm26/nwfpe/fpa11.c deleted file mode 100644 index e954540..0000000 --- a/arch/arm26/nwfpe/fpa11.c +++ /dev/null @@ -1,221 +0,0 @@ -/* - 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 "fpopcode.h" - -#include "fpmodule.h" -#include "fpmodule.inl" - -#include <linux/compiler.h> -#include <asm/system.h> - -/* forward declarations */ -unsigned int EmulateCPDO(const unsigned int); -unsigned int EmulateCPDT(const unsigned int); -unsigned int EmulateCPRT(const unsigned int); - -/* Reset the FPA11 chip. Called to initialize and reset the emulator. */ -void resetFPA11(void) -{ - int i; - FPA11 *fpa11 = GET_FPA11(); - - /* initialize the register type array */ - for (i=0;i<=7;i++) - { - fpa11->fType[i] = typeNone; - } - - /* FPSR: set system id to FP_EMULATOR, set AC, clear all other bits */ - fpa11->fpsr = FP_EMULATOR | BIT_AC; - - /* FPCR: set SB, AB and DA bits, clear all others */ -#if MAINTAIN_FPCR - fpa11->fpcr = MASK_RESET; -#endif -} - -void SetRoundingMode(const unsigned int opcode) -{ -#if MAINTAIN_FPCR - FPA11 *fpa11 = GET_FPA11(); - fpa11->fpcr &= ~MASK_ROUNDING_MODE; -#endif - switch (opcode & MASK_ROUNDING_MODE) - { - default: - case ROUND_TO_NEAREST: - float_rounding_mode = float_round_nearest_even; -#if MAINTAIN_FPCR - fpa11->fpcr |= ROUND_TO_NEAREST; -#endif - break; - - case ROUND_TO_PLUS_INFINITY: - float_rounding_mode = float_round_up; -#if MAINTAIN_FPCR - fpa11->fpcr |= ROUND_TO_PLUS_INFINITY; -#endif - break; - - case ROUND_TO_MINUS_INFINITY: - float_rounding_mode = float_round_down; -#if MAINTAIN_FPCR - fpa11->fpcr |= ROUND_TO_MINUS_INFINITY; -#endif - break; - - case ROUND_TO_ZERO: - float_rounding_mode = float_round_to_zero; -#if MAINTAIN_FPCR - fpa11->fpcr |= ROUND_TO_ZERO; -#endif - break; - } -} - -void SetRoundingPrecision(const unsigned int opcode) -{ -#if MAINTAIN_FPCR - FPA11 *fpa11 = GET_FPA11(); - fpa11->fpcr &= ~MASK_ROUNDING_PRECISION; -#endif - switch (opcode & MASK_ROUNDING_PRECISION) - { - case ROUND_SINGLE: - floatx80_rounding_precision = 32; -#if MAINTAIN_FPCR - fpa11->fpcr |= ROUND_SINGLE; -#endif - break; - - case ROUND_DOUBLE: - floatx80_rounding_precision = 64; -#if MAINTAIN_FPCR - fpa11->fpcr |= ROUND_DOUBLE; -#endif - break; - - case ROUND_EXTENDED: - floatx80_rounding_precision = 80; -#if MAINTAIN_FPCR - fpa11->fpcr |= ROUND_EXTENDED; -#endif - break; - - default: floatx80_rounding_precision = 80; - } -} - -void FPA11_CheckInit(void) -{ - FPA11 *fpa11 = GET_FPA11(); - if (unlikely(fpa11->initflag == 0)) - { - resetFPA11(); - SetRoundingMode(ROUND_TO_NEAREST); - SetRoundingPrecision(ROUND_EXTENDED); - fpa11->initflag = 1; - } -} - -/* Emulate the instruction in the opcode. */ -unsigned int EmulateAll(unsigned int opcode) -{ - unsigned int nRc = 1, code; - - code = opcode & 0x00000f00; - if (code == 0x00000100 || code == 0x00000200) - { - /* For coprocessor 1 or 2 (FPA11) */ - code = opcode & 0x0e000000; - if (code == 0x0e000000) - { - if (opcode & 0x00000010) - { - /* Emulate conversion opcodes. */ - /* Emulate register transfer opcodes. */ - /* Emulate comparison opcodes. */ - nRc = EmulateCPRT(opcode); - } - else - { - /* Emulate monadic arithmetic opcodes. */ - /* Emulate dyadic arithmetic opcodes. */ - nRc = EmulateCPDO(opcode); - } - } - else if (code == 0x0c000000) - { - /* Emulate load/store opcodes. */ - /* Emulate load/store multiple opcodes. */ - nRc = EmulateCPDT(opcode); - } - else - { - /* Invalid instruction detected. Return FALSE. */ - nRc = 0; - } - } - - return(nRc); -} - -#if 0 -unsigned int EmulateAll1(unsigned int opcode) -{ - switch ((opcode >> 24) & 0xf) - { - case 0xc: - case 0xd: - if ((opcode >> 20) & 0x1) - { - switch ((opcode >> 8) & 0xf) - { - case 0x1: return PerformLDF(opcode); break; - case 0x2: return PerformLFM(opcode); break; - default: return 0; - } - } - else - { - switch ((opcode >> 8) & 0xf) - { - case 0x1: return PerformSTF(opcode); break; - case 0x2: return PerformSFM(opcode); break; - default: return 0; - } - } - break; - - case 0xe: - if (opcode & 0x10) - return EmulateCPDO(opcode); - else - return EmulateCPRT(opcode); - break; - - default: return 0; - } -} -#endif - |
