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
181
182
|
#include "emulation.h"
#include "fp_emulation.h"
#include "config.h"
#include "unprivileged_memory.h"
#include "mtrap.h"
#include <limits.h>
void illegal_insn_trap(uintptr_t* regs, uintptr_t mcause, uintptr_t mepc)
{
asm (".pushsection .rodata\n"
"illegal_insn_trap_table:\n"
" .word truly_illegal_insn\n"
#if !defined(__riscv_hard_float) && defined(PK_ENABLE_FP_EMULATION)
" .word emulate_float_load\n"
#else
" .word truly_illegal_insn\n"
#endif
" .word truly_illegal_insn\n"
" .word truly_illegal_insn\n"
" .word truly_illegal_insn\n"
" .word truly_illegal_insn\n"
" .word truly_illegal_insn\n"
" .word truly_illegal_insn\n"
" .word truly_illegal_insn\n"
#if !defined(__riscv_hard_float) && defined(PK_ENABLE_FP_EMULATION)
" .word emulate_float_store\n"
#else
" .word truly_illegal_insn\n"
#endif
" .word truly_illegal_insn\n"
" .word truly_illegal_insn\n"
#if !defined(__riscv_muldiv)
" .word emulate_mul_div\n"
#else
" .word truly_illegal_insn\n"
#endif
" .word truly_illegal_insn\n"
#if !defined(__riscv_muldiv) && defined(__riscv64)
" .word emulate_mul_div32\n"
#else
" .word truly_illegal_insn\n"
#endif
" .word truly_illegal_insn\n"
#ifdef PK_ENABLE_FP_EMULATION
" .word emulate_fmadd\n"
" .word emulate_fmadd\n"
" .word emulate_fmadd\n"
" .word emulate_fmadd\n"
" .word emulate_fp\n"
#else
" .word truly_illegal_insn\n"
" .word truly_illegal_insn\n"
" .word truly_illegal_insn\n"
" .word truly_illegal_insn\n"
" .word truly_illegal_insn\n"
#endif
" .word truly_illegal_insn\n"
" .word truly_illegal_insn\n"
" .word truly_illegal_insn\n"
" .word truly_illegal_insn\n"
" .word truly_illegal_insn\n"
" .word truly_illegal_insn\n"
" .word truly_illegal_insn\n"
" .word emulate_system_opcode\n"
" .word truly_illegal_insn\n"
" .word truly_illegal_insn\n"
" .word truly_illegal_insn\n"
" .popsection");
uintptr_t mstatus;
insn_t insn = get_insn(mepc, &mstatus);
if (unlikely((insn & 3) != 3))
return truly_illegal_insn(regs, mcause, mepc, mstatus, insn);
write_csr(mepc, mepc + 4);
extern uint32_t illegal_insn_trap_table[];
uint32_t* pf = (void*)illegal_insn_trap_table + (insn & 0x7c);
emulation_func f = (emulation_func)(uintptr_t)*pf;
f(regs, mcause, mepc, mstatus, insn);
}
void __attribute__((noinline)) truly_illegal_insn(uintptr_t* regs, uintptr_t mcause, uintptr_t mepc, uintptr_t mstatus, insn_t insn)
{
redirect_trap(mepc, mstatus);
}
static inline int emulate_read_csr(int num, uintptr_t mstatus, uintptr_t* result)
{
switch (num)
{
case CSR_TIME:
*result = *mtime + HLS()->utime_delta;
return 0;
case CSR_CYCLE:
*result = read_csr(mcycle) + HLS()->ucycle_delta;
return 0;
case CSR_INSTRET:
*result = read_csr(minstret) + HLS()->uinstret_delta;
return 0;
case CSR_STIME:
*result = *mtime + HLS()->stime_delta;
return 0;
case CSR_SCYCLE:
*result = read_csr(mcycle) + HLS()->scycle_delta;
return 0;
case CSR_SINSTRET:
*result = read_csr(minstret) + HLS()->sinstret_delta;
return 0;
#ifdef __riscv32
case CSR_TIMEH:
*result = (*mtime + HLS()->stime_delta) >> 32;
return 0;
case CSR_CYCLEH:
*result = (((uint64_t)read_csr(mcycleh) << 32) + read_csr(mcycle)
+ HLS()->scycle_delta) >> 32;
return 0;
case CSR_INSTRETH:
*result = (((uint64_t)read_csr(minstreth) << 32) + read_csr(minstret)
+ HLS()->sinstret_delta) >> 32;
return 0;
#endif
#if !defined(__riscv_hard_float) && defined(PK_ENABLE_FP_EMULATION)
case CSR_FRM:
if ((mstatus & MSTATUS_FS) == 0) break;
*result = GET_FRM();
return 0;
case CSR_FFLAGS:
if ((mstatus & MSTATUS_FS) == 0) break;
*result = GET_FFLAGS();
return 0;
case CSR_FCSR:
if ((mstatus & MSTATUS_FS) == 0) break;
*result = GET_FCSR();
return 0;
#endif
}
return -1;
}
static inline int emulate_write_csr(int num, uintptr_t value, uintptr_t mstatus)
{
switch (num)
{
#if !defined(__riscv_hard_float) && defined(PK_ENABLE_FP_EMULATION)
case CSR_FRM: SET_FRM(value); return 0;
case CSR_FFLAGS: SET_FFLAGS(value); return 0;
case CSR_FCSR: SET_FCSR(value); return 0;
#endif
}
return -1;
}
DECLARE_EMULATION_FUNC(emulate_system_opcode)
{
int rs1_num = (insn >> 15) & 0x1f;
uintptr_t rs1_val = GET_RS1(insn, regs);
int csr_num = (uint32_t)insn >> 20;
uintptr_t csr_val, new_csr_val;
if (emulate_read_csr(csr_num, mstatus, &csr_val))
return truly_illegal_insn(regs, mcause, mepc, mstatus, insn);
int do_write = rs1_num;
switch (GET_RM(insn))
{
case 0: return truly_illegal_insn(regs, mcause, mepc, mstatus, insn);
case 1: new_csr_val = rs1_val; do_write = 1; break;
case 2: new_csr_val = csr_val | rs1_val; break;
case 3: new_csr_val = csr_val & ~rs1_val; break;
case 4: return truly_illegal_insn(regs, mcause, mepc, mstatus, insn);
case 5: new_csr_val = rs1_num; do_write = 1; break;
case 6: new_csr_val = csr_val | rs1_num; break;
case 7: new_csr_val = csr_val & ~rs1_num; break;
}
if (do_write && emulate_write_csr(csr_num, new_csr_val, mstatus))
return truly_illegal_insn(regs, mcause, mepc, mstatus, insn);
SET_RD(insn, regs, csr_val);
}
|
