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author | bunnei <bunneidev@gmail.com> | 2014-10-25 20:35:31 +0200 |
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committer | bunnei <bunneidev@gmail.com> | 2014-10-25 20:35:31 +0200 |
commit | 4615c73d15f6f27c5e275c57dcafcb56355b9c2d (patch) | |
tree | e11104887d1a680e3aa33bddc4ad3ca764ead696 /src/core/arm/skyeye_common/vfp/vfp_helper.h | |
parent | Merge pull request #149 from linkmauve/open-file-directly-fix (diff) | |
parent | ARM: Removed unnecessary and unused SkyEye MMU code. (diff) | |
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Diffstat (limited to 'src/core/arm/skyeye_common/vfp/vfp_helper.h')
-rw-r--r-- | src/core/arm/skyeye_common/vfp/vfp_helper.h | 541 |
1 files changed, 541 insertions, 0 deletions
diff --git a/src/core/arm/skyeye_common/vfp/vfp_helper.h b/src/core/arm/skyeye_common/vfp/vfp_helper.h new file mode 100644 index 000000000..a55bf875c --- /dev/null +++ b/src/core/arm/skyeye_common/vfp/vfp_helper.h @@ -0,0 +1,541 @@ +/* + vfp/vfp.h - ARM VFPv3 emulation unit - SoftFloat lib helper + Copyright (C) 2003 Skyeye Develop Group + for help please send mail to <skyeye-developer@lists.gro.clinux.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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA +*/ + +/* + * The following code is derivative from Linux Android kernel vfp + * floating point support. + * + * Copyright (C) 2004 ARM Limited. + * Written by Deep Blue Solutions Limited. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +#ifndef __VFP_HELPER_H__ +#define __VFP_HELPER_H__ + +/* Custom edit */ + +#include <stdint.h> +#include <stdio.h> + +#include "core/arm/skyeye_common/armdefs.h" + +#define u16 uint16_t +#define u32 uint32_t +#define u64 uint64_t +#define s16 int16_t +#define s32 int32_t +#define s64 int64_t + +#define pr_info //printf +#define pr_debug //printf + +static u32 vfp_fls(int x); +#define do_div(n, base) {n/=base;} + +/* From vfpinstr.h */ + +#define INST_CPRTDO(inst) (((inst) & 0x0f000000) == 0x0e000000) +#define INST_CPRT(inst) ((inst) & (1 << 4)) +#define INST_CPRT_L(inst) ((inst) & (1 << 20)) +#define INST_CPRT_Rd(inst) (((inst) & (15 << 12)) >> 12) +#define INST_CPRT_OP(inst) (((inst) >> 21) & 7) +#define INST_CPNUM(inst) ((inst) & 0xf00) +#define CPNUM(cp) ((cp) << 8) + +#define FOP_MASK (0x00b00040) +#define FOP_FMAC (0x00000000) +#define FOP_FNMAC (0x00000040) +#define FOP_FMSC (0x00100000) +#define FOP_FNMSC (0x00100040) +#define FOP_FMUL (0x00200000) +#define FOP_FNMUL (0x00200040) +#define FOP_FADD (0x00300000) +#define FOP_FSUB (0x00300040) +#define FOP_FDIV (0x00800000) +#define FOP_EXT (0x00b00040) + +#define FOP_TO_IDX(inst) ((inst & 0x00b00000) >> 20 | (inst & (1 << 6)) >> 4) + +#define FEXT_MASK (0x000f0080) +#define FEXT_FCPY (0x00000000) +#define FEXT_FABS (0x00000080) +#define FEXT_FNEG (0x00010000) +#define FEXT_FSQRT (0x00010080) +#define FEXT_FCMP (0x00040000) +#define FEXT_FCMPE (0x00040080) +#define FEXT_FCMPZ (0x00050000) +#define FEXT_FCMPEZ (0x00050080) +#define FEXT_FCVT (0x00070080) +#define FEXT_FUITO (0x00080000) +#define FEXT_FSITO (0x00080080) +#define FEXT_FTOUI (0x000c0000) +#define FEXT_FTOUIZ (0x000c0080) +#define FEXT_FTOSI (0x000d0000) +#define FEXT_FTOSIZ (0x000d0080) + +#define FEXT_TO_IDX(inst) ((inst & 0x000f0000) >> 15 | (inst & (1 << 7)) >> 7) + +#define vfp_get_sd(inst) ((inst & 0x0000f000) >> 11 | (inst & (1 << 22)) >> 22) +#define vfp_get_dd(inst) ((inst & 0x0000f000) >> 12 | (inst & (1 << 22)) >> 18) +#define vfp_get_sm(inst) ((inst & 0x0000000f) << 1 | (inst & (1 << 5)) >> 5) +#define vfp_get_dm(inst) ((inst & 0x0000000f) | (inst & (1 << 5)) >> 1) +#define vfp_get_sn(inst) ((inst & 0x000f0000) >> 15 | (inst & (1 << 7)) >> 7) +#define vfp_get_dn(inst) ((inst & 0x000f0000) >> 16 | (inst & (1 << 7)) >> 3) + +#define vfp_single(inst) (((inst) & 0x0000f00) == 0xa00) + +#define FPSCR_N (1 << 31) +#define FPSCR_Z (1 << 30) +#define FPSCR_C (1 << 29) +#define FPSCR_V (1 << 28) + +/* -------------- */ + +/* From asm/include/vfp.h */ + +/* FPSCR bits */ +#define FPSCR_DEFAULT_NAN (1<<25) +#define FPSCR_FLUSHTOZERO (1<<24) +#define FPSCR_ROUND_NEAREST (0<<22) +#define FPSCR_ROUND_PLUSINF (1<<22) +#define FPSCR_ROUND_MINUSINF (2<<22) +#define FPSCR_ROUND_TOZERO (3<<22) +#define FPSCR_RMODE_BIT (22) +#define FPSCR_RMODE_MASK (3 << FPSCR_RMODE_BIT) +#define FPSCR_STRIDE_BIT (20) +#define FPSCR_STRIDE_MASK (3 << FPSCR_STRIDE_BIT) +#define FPSCR_LENGTH_BIT (16) +#define FPSCR_LENGTH_MASK (7 << FPSCR_LENGTH_BIT) +#define FPSCR_IOE (1<<8) +#define FPSCR_DZE (1<<9) +#define FPSCR_OFE (1<<10) +#define FPSCR_UFE (1<<11) +#define FPSCR_IXE (1<<12) +#define FPSCR_IDE (1<<15) +#define FPSCR_IOC (1<<0) +#define FPSCR_DZC (1<<1) +#define FPSCR_OFC (1<<2) +#define FPSCR_UFC (1<<3) +#define FPSCR_IXC (1<<4) +#define FPSCR_IDC (1<<7) + +/* ---------------- */ + +static inline u32 vfp_shiftright32jamming(u32 val, unsigned int shift) +{ + if (shift) { + if (shift < 32) + val = val >> shift | ((val << (32 - shift)) != 0); + else + val = val != 0; + } + return val; +} + +static inline u64 vfp_shiftright64jamming(u64 val, unsigned int shift) +{ + if (shift) { + if (shift < 64) + val = val >> shift | ((val << (64 - shift)) != 0); + else + val = val != 0; + } + return val; +} + +static inline u32 vfp_hi64to32jamming(u64 val) +{ + u32 v; + u32 highval = val >> 32; + u32 lowval = val & 0xffffffff; + + if (lowval >= 1) + v = highval | 1; + else + v = highval; + + return v; +} + +static inline void add128(u64 *resh, u64 *resl, u64 nh, u64 nl, u64 mh, u64 ml) +{ + *resl = nl + ml; + *resh = nh + mh; + if (*resl < nl) + *resh += 1; +} + +static inline void sub128(u64 *resh, u64 *resl, u64 nh, u64 nl, u64 mh, u64 ml) +{ + *resl = nl - ml; + *resh = nh - mh; + if (*resl > nl) + *resh -= 1; +} + +static inline void mul64to128(u64 *resh, u64 *resl, u64 n, u64 m) +{ + u32 nh, nl, mh, ml; + u64 rh, rma, rmb, rl; + + nl = n; + ml = m; + rl = (u64)nl * ml; + + nh = n >> 32; + rma = (u64)nh * ml; + + mh = m >> 32; + rmb = (u64)nl * mh; + rma += rmb; + + rh = (u64)nh * mh; + rh += ((u64)(rma < rmb) << 32) + (rma >> 32); + + rma <<= 32; + rl += rma; + rh += (rl < rma); + + *resl = rl; + *resh = rh; +} + +static inline void shift64left(u64 *resh, u64 *resl, u64 n) +{ + *resh = n >> 63; + *resl = n << 1; +} + +static inline u64 vfp_hi64multiply64(u64 n, u64 m) +{ + u64 rh, rl; + mul64to128(&rh, &rl, n, m); + return rh | (rl != 0); +} + +static inline u64 vfp_estimate_div128to64(u64 nh, u64 nl, u64 m) +{ + u64 mh, ml, remh, reml, termh, terml, z; + + if (nh >= m) + return ~0ULL; + mh = m >> 32; + if (mh << 32 <= nh) { + z = 0xffffffff00000000ULL; + } else { + z = nh; + do_div(z, mh); + z <<= 32; + } + mul64to128(&termh, &terml, m, z); + sub128(&remh, &reml, nh, nl, termh, terml); + ml = m << 32; + while ((s64)remh < 0) { + z -= 0x100000000ULL; + add128(&remh, &reml, remh, reml, mh, ml); + } + remh = (remh << 32) | (reml >> 32); + if (mh << 32 <= remh) { + z |= 0xffffffff; + } else { + do_div(remh, mh); + z |= remh; + } + return z; +} + +/* + * Operations on unpacked elements + */ +#define vfp_sign_negate(sign) (sign ^ 0x8000) + +/* + * Single-precision + */ +struct vfp_single { + s16 exponent; + u16 sign; + u32 significand; +}; + +#ifdef __cplusplus + extern "C" { +#endif +extern s32 vfp_get_float(ARMul_State * state, unsigned int reg); +extern void vfp_put_float(ARMul_State * state, s32 val, unsigned int reg); +#ifdef __cplusplus + } +#endif + +/* + * VFP_SINGLE_MANTISSA_BITS - number of bits in the mantissa + * VFP_SINGLE_EXPONENT_BITS - number of bits in the exponent + * VFP_SINGLE_LOW_BITS - number of low bits in the unpacked significand + * which are not propagated to the float upon packing. + */ +#define VFP_SINGLE_MANTISSA_BITS (23) +#define VFP_SINGLE_EXPONENT_BITS (8) +#define VFP_SINGLE_LOW_BITS (32 - VFP_SINGLE_MANTISSA_BITS - 2) +#define VFP_SINGLE_LOW_BITS_MASK ((1 << VFP_SINGLE_LOW_BITS) - 1) + +/* + * The bit in an unpacked float which indicates that it is a quiet NaN + */ +#define VFP_SINGLE_SIGNIFICAND_QNAN (1 << (VFP_SINGLE_MANTISSA_BITS - 1 + VFP_SINGLE_LOW_BITS)) + +/* + * Operations on packed single-precision numbers + */ +#define vfp_single_packed_sign(v) ((v) & 0x80000000) +#define vfp_single_packed_negate(v) ((v) ^ 0x80000000) +#define vfp_single_packed_abs(v) ((v) & ~0x80000000) +#define vfp_single_packed_exponent(v) (((v) >> VFP_SINGLE_MANTISSA_BITS) & ((1 << VFP_SINGLE_EXPONENT_BITS) - 1)) +#define vfp_single_packed_mantissa(v) ((v) & ((1 << VFP_SINGLE_MANTISSA_BITS) - 1)) + +/* + * Unpack a single-precision float. Note that this returns the magnitude + * of the single-precision float mantissa with the 1. if necessary, + * aligned to bit 30. + */ +static inline void vfp_single_unpack(struct vfp_single *s, s32 val) +{ + u32 significand; + + s->sign = vfp_single_packed_sign(val) >> 16, + s->exponent = vfp_single_packed_exponent(val); + + significand = (u32) val; + significand = (significand << (32 - VFP_SINGLE_MANTISSA_BITS)) >> 2; + if (s->exponent && s->exponent != 255) + significand |= 0x40000000; + s->significand = significand; +} + +/* + * Re-pack a single-precision float. This assumes that the float is + * already normalised such that the MSB is bit 30, _not_ bit 31. + */ +static inline s32 vfp_single_pack(struct vfp_single *s) +{ + u32 val; + val = (s->sign << 16) + + (s->exponent << VFP_SINGLE_MANTISSA_BITS) + + (s->significand >> VFP_SINGLE_LOW_BITS); + return (s32)val; +} + +#define VFP_NUMBER (1<<0) +#define VFP_ZERO (1<<1) +#define VFP_DENORMAL (1<<2) +#define VFP_INFINITY (1<<3) +#define VFP_NAN (1<<4) +#define VFP_NAN_SIGNAL (1<<5) + +#define VFP_QNAN (VFP_NAN) +#define VFP_SNAN (VFP_NAN|VFP_NAN_SIGNAL) + +static inline int vfp_single_type(struct vfp_single *s) +{ + int type = VFP_NUMBER; + if (s->exponent == 255) { + if (s->significand == 0) + type = VFP_INFINITY; + else if (s->significand & VFP_SINGLE_SIGNIFICAND_QNAN) + type = VFP_QNAN; + else + type = VFP_SNAN; + } else if (s->exponent == 0) { + if (s->significand == 0) + type |= VFP_ZERO; + else + type |= VFP_DENORMAL; + } + return type; +} + + +u32 vfp_single_normaliseround(ARMul_State* state, int sd, struct vfp_single *vs, u32 fpscr, u32 exceptions, const char *func); + +/* + * Double-precision + */ +struct vfp_double { + s16 exponent; + u16 sign; + u64 significand; +}; + +/* + * VFP_REG_ZERO is a special register number for vfp_get_double + * which returns (double)0.0. This is useful for the compare with + * zero instructions. + */ +#ifdef CONFIG_VFPv3 +#define VFP_REG_ZERO 32 +#else +#define VFP_REG_ZERO 16 +#endif +#ifdef __cplusplus + extern "C" { +#endif +extern u64 vfp_get_double(ARMul_State * state, unsigned int reg); +extern void vfp_put_double(ARMul_State * state, u64 val, unsigned int reg); +#ifdef __cplusplus + } +#endif +#define VFP_DOUBLE_MANTISSA_BITS (52) +#define VFP_DOUBLE_EXPONENT_BITS (11) +#define VFP_DOUBLE_LOW_BITS (64 - VFP_DOUBLE_MANTISSA_BITS - 2) +#define VFP_DOUBLE_LOW_BITS_MASK ((1 << VFP_DOUBLE_LOW_BITS) - 1) + +/* + * The bit in an unpacked double which indicates that it is a quiet NaN + */ +#define VFP_DOUBLE_SIGNIFICAND_QNAN (1ULL << (VFP_DOUBLE_MANTISSA_BITS - 1 + VFP_DOUBLE_LOW_BITS)) + +/* + * Operations on packed single-precision numbers + */ +#define vfp_double_packed_sign(v) ((v) & (1ULL << 63)) +#define vfp_double_packed_negate(v) ((v) ^ (1ULL << 63)) +#define vfp_double_packed_abs(v) ((v) & ~(1ULL << 63)) +#define vfp_double_packed_exponent(v) (((v) >> VFP_DOUBLE_MANTISSA_BITS) & ((1 << VFP_DOUBLE_EXPONENT_BITS) - 1)) +#define vfp_double_packed_mantissa(v) ((v) & ((1ULL << VFP_DOUBLE_MANTISSA_BITS) - 1)) + +/* + * Unpack a double-precision float. Note that this returns the magnitude + * of the double-precision float mantissa with the 1. if necessary, + * aligned to bit 62. + */ +static inline void vfp_double_unpack(struct vfp_double *s, s64 val) +{ + u64 significand; + + s->sign = vfp_double_packed_sign(val) >> 48; + s->exponent = vfp_double_packed_exponent(val); + + significand = (u64) val; + significand = (significand << (64 - VFP_DOUBLE_MANTISSA_BITS)) >> 2; + if (s->exponent && s->exponent != 2047) + significand |= (1ULL << 62); + s->significand = significand; +} + +/* + * Re-pack a double-precision float. This assumes that the float is + * already normalised such that the MSB is bit 30, _not_ bit 31. + */ +static inline s64 vfp_double_pack(struct vfp_double *s) +{ + u64 val; + val = ((u64)s->sign << 48) + + ((u64)s->exponent << VFP_DOUBLE_MANTISSA_BITS) + + (s->significand >> VFP_DOUBLE_LOW_BITS); + return (s64)val; +} + +static inline int vfp_double_type(struct vfp_double *s) +{ + int type = VFP_NUMBER; + if (s->exponent == 2047) { + if (s->significand == 0) + type = VFP_INFINITY; + else if (s->significand & VFP_DOUBLE_SIGNIFICAND_QNAN) + type = VFP_QNAN; + else + type = VFP_SNAN; + } else if (s->exponent == 0) { + if (s->significand == 0) + type |= VFP_ZERO; + else + type |= VFP_DENORMAL; + } + return type; +} + +u32 vfp_double_normaliseround(ARMul_State* state, int dd, struct vfp_double *vd, u32 fpscr, u32 exceptions, const char *func); + +u32 vfp_estimate_sqrt_significand(u32 exponent, u32 significand); + +/* + * A special flag to tell the normalisation code not to normalise. + */ +#define VFP_NAN_FLAG 0x100 + +/* + * A bit pattern used to indicate the initial (unset) value of the + * exception mask, in case nothing handles an instruction. This + * doesn't include the NAN flag, which get masked out before + * we check for an error. + */ +#define VFP_EXCEPTION_ERROR ((u32)-1 & ~VFP_NAN_FLAG) + +/* + * A flag to tell vfp instruction type. + * OP_SCALAR - this operation always operates in scalar mode + * OP_SD - the instruction exceptionally writes to a single precision result. + * OP_DD - the instruction exceptionally writes to a double precision result. + * OP_SM - the instruction exceptionally reads from a single precision operand. + */ +#define OP_SCALAR (1 << 0) +#define OP_SD (1 << 1) +#define OP_DD (1 << 1) +#define OP_SM (1 << 2) + +struct op { + u32 (* const fn)(ARMul_State* state, int dd, int dn, int dm, u32 fpscr); + u32 flags; +}; + +static u32 vfp_fls(int x) +{ + int r = 32; + + if (!x) + return 0; + if (!(x & 0xffff0000u)) { + x <<= 16; + r -= 16; + } + if (!(x & 0xff000000u)) { + x <<= 8; + r -= 8; + } + if (!(x & 0xf0000000u)) { + x <<= 4; + r -= 4; + } + if (!(x & 0xc0000000u)) { + x <<= 2; + r -= 2; + } + if (!(x & 0x80000000u)) { + x <<= 1; + r -= 1; + } + return r; + +} + +#endif |