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
|
/*
* RISC-V CPU init and loop
*
* Copyright (c) 2019 Mark Corbin
*
* 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, see <http://www.gnu.org/licenses/>.
*/
#ifndef TARGET_ARCH_CPU_H
#define TARGET_ARCH_CPU_H
#include "target_arch.h"
#include "signal-common.h"
#define TARGET_DEFAULT_CPU_MODEL "max"
static inline void target_cpu_init(CPURISCVState *env,
struct target_pt_regs *regs)
{
int i;
for (i = 1; i < 32; i++) {
env->gpr[i] = regs->regs[i];
}
env->pc = regs->sepc;
}
static inline G_NORETURN void target_cpu_loop(CPURISCVState *env)
{
CPUState *cs = env_cpu(env);
int trapnr;
abi_long ret;
unsigned int syscall_num;
int32_t signo, code;
for (;;) {
cpu_exec_start(cs);
trapnr = cpu_exec(cs);
cpu_exec_end(cs);
process_queued_cpu_work(cs);
signo = 0;
switch (trapnr) {
case EXCP_INTERRUPT:
/* just indicate that signals should be handled asap */
break;
case EXCP_ATOMIC:
cpu_exec_step_atomic(cs);
break;
case RISCV_EXCP_U_ECALL:
syscall_num = env->gpr[xT0];
env->pc += TARGET_INSN_SIZE;
/* Compare to cpu_fetch_syscall_args() in riscv/riscv/trap.c */
if (TARGET_FREEBSD_NR___syscall == syscall_num ||
TARGET_FREEBSD_NR_syscall == syscall_num) {
ret = do_freebsd_syscall(env,
env->gpr[xA0],
env->gpr[xA1],
env->gpr[xA2],
env->gpr[xA3],
env->gpr[xA4],
env->gpr[xA5],
env->gpr[xA6],
env->gpr[xA7],
0);
} else {
ret = do_freebsd_syscall(env,
syscall_num,
env->gpr[xA0],
env->gpr[xA1],
env->gpr[xA2],
env->gpr[xA3],
env->gpr[xA4],
env->gpr[xA5],
env->gpr[xA6],
env->gpr[xA7]
);
}
/*
* Compare to cpu_set_syscall_retval() in
* riscv/riscv/vm_machdep.c
*/
if (ret >= 0) {
env->gpr[xA0] = ret;
env->gpr[xT0] = 0;
} else if (ret == -TARGET_ERESTART) {
env->pc -= TARGET_INSN_SIZE;
} else if (ret != -TARGET_EJUSTRETURN) {
env->gpr[xA0] = -ret;
env->gpr[xT0] = 1;
}
break;
case RISCV_EXCP_ILLEGAL_INST:
signo = TARGET_SIGILL;
code = TARGET_ILL_ILLOPC;
break;
case RISCV_EXCP_BREAKPOINT:
signo = TARGET_SIGTRAP;
code = TARGET_TRAP_BRKPT;
break;
case EXCP_DEBUG:
signo = TARGET_SIGTRAP;
code = TARGET_TRAP_BRKPT;
break;
default:
fprintf(stderr, "qemu: unhandled CPU exception "
"0x%x - aborting\n", trapnr);
cpu_dump_state(cs, stderr, 0);
abort();
}
if (signo) {
force_sig_fault(signo, code, env->pc);
}
process_pending_signals(env);
}
}
static inline void target_cpu_clone_regs(CPURISCVState *env, target_ulong newsp)
{
if (newsp) {
env->gpr[xSP] = newsp;
}
env->gpr[xA0] = 0;
env->gpr[xT0] = 0;
}
static inline void target_cpu_reset(CPUArchState *env)
{
}
#endif /* TARGET_ARCH_CPU_H */
|
