1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
|
/*
* OpenRISC float helper routines
*
* Copyright (c) 2011-2012 Jia Liu <proljc@gmail.com>
* Feng Gao <gf91597@gmail.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, see <http://www.gnu.org/licenses/>.
*/
#include "qemu/osdep.h"
#include "cpu.h"
#include "exec/exec-all.h"
#include "exec/helper-proto.h"
#include "fpu/softfloat.h"
static int ieee_ex_to_openrisc(int fexcp)
{
int ret = 0;
if (fexcp & float_flag_invalid) {
ret |= FPCSR_IVF;
}
if (fexcp & float_flag_overflow) {
ret |= FPCSR_OVF;
}
if (fexcp & float_flag_underflow) {
ret |= FPCSR_UNF;
}
if (fexcp & float_flag_divbyzero) {
ret |= FPCSR_DZF;
}
if (fexcp & float_flag_inexact) {
ret |= FPCSR_IXF;
}
return ret;
}
static G_NORETURN
void do_fpe(CPUOpenRISCState *env, uintptr_t pc)
{
CPUState *cs = env_cpu(env);
cs->exception_index = EXCP_FPE;
cpu_loop_exit_restore(cs, pc);
}
void HELPER(update_fpcsr)(CPUOpenRISCState *env)
{
int tmp = get_float_exception_flags(&env->fp_status);
if (tmp) {
set_float_exception_flags(0, &env->fp_status);
tmp = ieee_ex_to_openrisc(tmp);
if (tmp) {
env->fpcsr |= tmp;
if (env->fpcsr & FPCSR_FPEE) {
do_fpe(env, GETPC());
}
}
}
}
void cpu_set_fpcsr(CPUOpenRISCState *env, uint32_t val)
{
static const int rm_to_sf[] = {
float_round_nearest_even,
float_round_to_zero,
float_round_up,
float_round_down
};
env->fpcsr = val & 0xfff;
set_float_rounding_mode(rm_to_sf[extract32(val, 1, 2)], &env->fp_status);
}
uint64_t HELPER(itofd)(CPUOpenRISCState *env, uint64_t val)
{
return int64_to_float64(val, &env->fp_status);
}
uint32_t HELPER(itofs)(CPUOpenRISCState *env, uint32_t val)
{
return int32_to_float32(val, &env->fp_status);
}
uint64_t HELPER(ftoid)(CPUOpenRISCState *env, uint64_t val)
{
return float64_to_int64_round_to_zero(val, &env->fp_status);
}
uint32_t HELPER(ftois)(CPUOpenRISCState *env, uint32_t val)
{
return float32_to_int32_round_to_zero(val, &env->fp_status);
}
uint64_t HELPER(stod)(CPUOpenRISCState *env, uint32_t val)
{
return float32_to_float64(val, &env->fp_status);
}
uint32_t HELPER(dtos)(CPUOpenRISCState *env, uint64_t val)
{
return float64_to_float32(val, &env->fp_status);
}
#define FLOAT_CALC(name) \
uint64_t helper_float_ ## name ## _d(CPUOpenRISCState *env, \
uint64_t fdt0, uint64_t fdt1) \
{ return float64_ ## name(fdt0, fdt1, &env->fp_status); } \
uint32_t helper_float_ ## name ## _s(CPUOpenRISCState *env, \
uint32_t fdt0, uint32_t fdt1) \
{ return float32_ ## name(fdt0, fdt1, &env->fp_status); }
FLOAT_CALC(add)
FLOAT_CALC(sub)
FLOAT_CALC(mul)
FLOAT_CALC(div)
FLOAT_CALC(rem)
#undef FLOAT_CALC
uint64_t helper_float_madd_d(CPUOpenRISCState *env, uint64_t a,
uint64_t b, uint64_t c)
{
/* Note that or1ksim doesn't use fused operation. */
b = float64_mul(b, c, &env->fp_status);
return float64_add(a, b, &env->fp_status);
}
uint32_t helper_float_madd_s(CPUOpenRISCState *env, uint32_t a,
uint32_t b, uint32_t c)
{
/* Note that or1ksim doesn't use fused operation. */
b = float32_mul(b, c, &env->fp_status);
return float32_add(a, b, &env->fp_status);
}
#define FLOAT_CMP(name, impl) \
target_ulong helper_float_ ## name ## _d(CPUOpenRISCState *env, \
uint64_t fdt0, uint64_t fdt1) \
{ return float64_ ## impl(fdt0, fdt1, &env->fp_status); } \
target_ulong helper_float_ ## name ## _s(CPUOpenRISCState *env, \
uint32_t fdt0, uint32_t fdt1) \
{ return float32_ ## impl(fdt0, fdt1, &env->fp_status); }
FLOAT_CMP(le, le)
FLOAT_CMP(lt, lt)
FLOAT_CMP(eq, eq_quiet)
FLOAT_CMP(un, unordered_quiet)
#undef FLOAT_CMP
#define FLOAT_UCMP(name, expr) \
target_ulong helper_float_ ## name ## _d(CPUOpenRISCState *env, \
uint64_t fdt0, uint64_t fdt1) \
{ \
FloatRelation r = float64_compare_quiet(fdt0, fdt1, &env->fp_status); \
return expr; \
} \
target_ulong helper_float_ ## name ## _s(CPUOpenRISCState *env, \
uint32_t fdt0, uint32_t fdt1) \
{ \
FloatRelation r = float32_compare_quiet(fdt0, fdt1, &env->fp_status); \
return expr; \
}
FLOAT_UCMP(ueq, r == float_relation_equal || r == float_relation_unordered)
FLOAT_UCMP(ult, r == float_relation_less || r == float_relation_unordered)
FLOAT_UCMP(ule, r != float_relation_greater)
#undef FLOAT_UCMP
|
