1 /* 2 * OpenRISC float helper routines 3 * 4 * Copyright (c) 2011-2012 Jia Liu <proljc@gmail.com> 5 * Feng Gao <gf91597@gmail.com> 6 * 7 * This library is free software; you can redistribute it and/or 8 * modify it under the terms of the GNU Lesser General Public 9 * License as published by the Free Software Foundation; either 10 * version 2.1 of the License, or (at your option) any later version. 11 * 12 * This library is distributed in the hope that it will be useful, 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 15 * Lesser General Public License for more details. 16 * 17 * You should have received a copy of the GNU Lesser General Public 18 * License along with this library; if not, see <http://www.gnu.org/licenses/>. 19 */ 20 21 #include "qemu/osdep.h" 22 #include "cpu.h" 23 #include "exec/exec-all.h" 24 #include "exec/helper-proto.h" 25 #include "fpu/softfloat.h" 26 27 static int ieee_ex_to_openrisc(int fexcp) 28 { 29 int ret = 0; 30 if (fexcp & float_flag_invalid) { 31 ret |= FPCSR_IVF; 32 } 33 if (fexcp & float_flag_overflow) { 34 ret |= FPCSR_OVF; 35 } 36 if (fexcp & float_flag_underflow) { 37 ret |= FPCSR_UNF; 38 } 39 if (fexcp & float_flag_divbyzero) { 40 ret |= FPCSR_DZF; 41 } 42 if (fexcp & float_flag_inexact) { 43 ret |= FPCSR_IXF; 44 } 45 return ret; 46 } 47 48 static G_NORETURN 49 void do_fpe(CPUOpenRISCState *env, uintptr_t pc) 50 { 51 CPUState *cs = env_cpu(env); 52 53 cs->exception_index = EXCP_FPE; 54 cpu_loop_exit_restore(cs, pc); 55 } 56 57 void HELPER(update_fpcsr)(CPUOpenRISCState *env) 58 { 59 int tmp = get_float_exception_flags(&env->fp_status); 60 61 if (tmp) { 62 set_float_exception_flags(0, &env->fp_status); 63 tmp = ieee_ex_to_openrisc(tmp); 64 if (tmp) { 65 env->fpcsr |= tmp; 66 if (env->fpcsr & FPCSR_FPEE) { 67 do_fpe(env, GETPC()); 68 } 69 } 70 } 71 } 72 73 void cpu_set_fpcsr(CPUOpenRISCState *env, uint32_t val) 74 { 75 static const int rm_to_sf[] = { 76 float_round_nearest_even, 77 float_round_to_zero, 78 float_round_up, 79 float_round_down 80 }; 81 82 env->fpcsr = val & 0xfff; 83 set_float_rounding_mode(rm_to_sf[extract32(val, 1, 2)], &env->fp_status); 84 } 85 86 uint64_t HELPER(itofd)(CPUOpenRISCState *env, uint64_t val) 87 { 88 return int64_to_float64(val, &env->fp_status); 89 } 90 91 uint32_t HELPER(itofs)(CPUOpenRISCState *env, uint32_t val) 92 { 93 return int32_to_float32(val, &env->fp_status); 94 } 95 96 uint64_t HELPER(ftoid)(CPUOpenRISCState *env, uint64_t val) 97 { 98 return float64_to_int64_round_to_zero(val, &env->fp_status); 99 } 100 101 uint32_t HELPER(ftois)(CPUOpenRISCState *env, uint32_t val) 102 { 103 return float32_to_int32_round_to_zero(val, &env->fp_status); 104 } 105 106 uint64_t HELPER(stod)(CPUOpenRISCState *env, uint32_t val) 107 { 108 return float32_to_float64(val, &env->fp_status); 109 } 110 111 uint32_t HELPER(dtos)(CPUOpenRISCState *env, uint64_t val) 112 { 113 return float64_to_float32(val, &env->fp_status); 114 } 115 116 #define FLOAT_CALC(name) \ 117 uint64_t helper_float_ ## name ## _d(CPUOpenRISCState *env, \ 118 uint64_t fdt0, uint64_t fdt1) \ 119 { return float64_ ## name(fdt0, fdt1, &env->fp_status); } \ 120 uint32_t helper_float_ ## name ## _s(CPUOpenRISCState *env, \ 121 uint32_t fdt0, uint32_t fdt1) \ 122 { return float32_ ## name(fdt0, fdt1, &env->fp_status); } 123 124 FLOAT_CALC(add) 125 FLOAT_CALC(sub) 126 FLOAT_CALC(mul) 127 FLOAT_CALC(div) 128 FLOAT_CALC(rem) 129 #undef FLOAT_CALC 130 131 132 uint64_t helper_float_madd_d(CPUOpenRISCState *env, uint64_t a, 133 uint64_t b, uint64_t c) 134 { 135 /* Note that or1ksim doesn't use fused operation. */ 136 b = float64_mul(b, c, &env->fp_status); 137 return float64_add(a, b, &env->fp_status); 138 } 139 140 uint32_t helper_float_madd_s(CPUOpenRISCState *env, uint32_t a, 141 uint32_t b, uint32_t c) 142 { 143 /* Note that or1ksim doesn't use fused operation. */ 144 b = float32_mul(b, c, &env->fp_status); 145 return float32_add(a, b, &env->fp_status); 146 } 147 148 149 #define FLOAT_CMP(name, impl) \ 150 target_ulong helper_float_ ## name ## _d(CPUOpenRISCState *env, \ 151 uint64_t fdt0, uint64_t fdt1) \ 152 { return float64_ ## impl(fdt0, fdt1, &env->fp_status); } \ 153 target_ulong helper_float_ ## name ## _s(CPUOpenRISCState *env, \ 154 uint32_t fdt0, uint32_t fdt1) \ 155 { return float32_ ## impl(fdt0, fdt1, &env->fp_status); } 156 157 FLOAT_CMP(le, le) 158 FLOAT_CMP(lt, lt) 159 FLOAT_CMP(eq, eq_quiet) 160 FLOAT_CMP(un, unordered_quiet) 161 #undef FLOAT_CMP 162 163 #define FLOAT_UCMP(name, expr) \ 164 target_ulong helper_float_ ## name ## _d(CPUOpenRISCState *env, \ 165 uint64_t fdt0, uint64_t fdt1) \ 166 { \ 167 FloatRelation r = float64_compare_quiet(fdt0, fdt1, &env->fp_status); \ 168 return expr; \ 169 } \ 170 target_ulong helper_float_ ## name ## _s(CPUOpenRISCState *env, \ 171 uint32_t fdt0, uint32_t fdt1) \ 172 { \ 173 FloatRelation r = float32_compare_quiet(fdt0, fdt1, &env->fp_status); \ 174 return expr; \ 175 } 176 177 FLOAT_UCMP(ueq, r == float_relation_equal || r == float_relation_unordered) 178 FLOAT_UCMP(ult, r == float_relation_less || r == float_relation_unordered) 179 FLOAT_UCMP(ule, r != float_relation_greater) 180 #undef FLOAT_UCMP 181