Merge tag 'mips-20220809' of https://github.com/philmd/qemu into staging
[qemu.git] / linux-user / hexagon / cpu_loop.c
1 /*
2 * qemu user cpu loop
3 *
4 * Copyright (c) 2003-2008 Fabrice Bellard
5 * Copyright(c) 2019-2021 Qualcomm Innovation Center, Inc. All Rights Reserved.
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
11 *
12 * This program 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
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, see <http://www.gnu.org/licenses/>.
19 */
20
21 #include "qemu/osdep.h"
22 #include "qemu.h"
23 #include "user-internals.h"
24 #include "cpu_loop-common.h"
25 #include "signal-common.h"
26 #include "internal.h"
27
28 void cpu_loop(CPUHexagonState *env)
29 {
30 CPUState *cs = env_cpu(env);
31 int trapnr;
32 target_ulong syscallnum;
33 target_ulong ret;
34
35 for (;;) {
36 cpu_exec_start(cs);
37 trapnr = cpu_exec(cs);
38 cpu_exec_end(cs);
39 process_queued_cpu_work(cs);
40
41 switch (trapnr) {
42 case EXCP_INTERRUPT:
43 /* just indicate that signals should be handled asap */
44 break;
45 case HEX_EXCP_TRAP0:
46 syscallnum = env->gpr[6];
47 env->gpr[HEX_REG_PC] += 4;
48 ret = do_syscall(env,
49 syscallnum,
50 env->gpr[0],
51 env->gpr[1],
52 env->gpr[2],
53 env->gpr[3],
54 env->gpr[4],
55 env->gpr[5],
56 0, 0);
57 if (ret == -TARGET_ERESTARTSYS) {
58 env->gpr[HEX_REG_PC] -= 4;
59 } else if (ret != -TARGET_QEMU_ESIGRETURN) {
60 env->gpr[0] = ret;
61 }
62 break;
63 case EXCP_ATOMIC:
64 cpu_exec_step_atomic(cs);
65 break;
66 default:
67 EXCP_DUMP(env, "\nqemu: unhandled CPU exception %#x - aborting\n",
68 trapnr);
69 exit(EXIT_FAILURE);
70 }
71 process_pending_signals(env);
72 }
73 }
74
75 void target_cpu_copy_regs(CPUArchState *env, struct target_pt_regs *regs)
76 {
77 env->gpr[HEX_REG_PC] = regs->sepc;
78 env->gpr[HEX_REG_SP] = regs->sp;
79 env->gpr[HEX_REG_USR] = 0x56000;
80 }