Merge remote-tracking branch 'remotes/marcandre/tags/rtd-pull-request' 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 "cpu_loop-common.h"
24 #include "internal.h"
25
26 void cpu_loop(CPUHexagonState *env)
27 {
28 CPUState *cs = CPU(hexagon_env_get_cpu(env));
29 int trapnr, signum, sigcode;
30 target_ulong sigaddr;
31 target_ulong syscallnum;
32 target_ulong ret;
33
34 for (;;) {
35 cpu_exec_start(cs);
36 trapnr = cpu_exec(cs);
37 cpu_exec_end(cs);
38 process_queued_cpu_work(cs);
39
40 signum = 0;
41 sigcode = 0;
42 sigaddr = 0;
43
44 switch (trapnr) {
45 case EXCP_INTERRUPT:
46 /* just indicate that signals should be handled asap */
47 break;
48 case HEX_EXCP_TRAP0:
49 syscallnum = env->gpr[6];
50 env->gpr[HEX_REG_PC] += 4;
51 ret = do_syscall(env,
52 syscallnum,
53 env->gpr[0],
54 env->gpr[1],
55 env->gpr[2],
56 env->gpr[3],
57 env->gpr[4],
58 env->gpr[5],
59 0, 0);
60 if (ret == -TARGET_ERESTARTSYS) {
61 env->gpr[HEX_REG_PC] -= 4;
62 } else if (ret != -TARGET_QEMU_ESIGRETURN) {
63 env->gpr[0] = ret;
64 }
65 break;
66 case HEX_EXCP_FETCH_NO_UPAGE:
67 case HEX_EXCP_PRIV_NO_UREAD:
68 case HEX_EXCP_PRIV_NO_UWRITE:
69 signum = TARGET_SIGSEGV;
70 sigcode = TARGET_SEGV_MAPERR;
71 break;
72 case EXCP_ATOMIC:
73 cpu_exec_step_atomic(cs);
74 break;
75 default:
76 EXCP_DUMP(env, "\nqemu: unhandled CPU exception %#x - aborting\n",
77 trapnr);
78 exit(EXIT_FAILURE);
79 }
80
81 if (signum) {
82 target_siginfo_t info = {
83 .si_signo = signum,
84 .si_errno = 0,
85 .si_code = sigcode,
86 ._sifields._sigfault._addr = sigaddr
87 };
88 queue_signal(env, info.si_signo, QEMU_SI_KILL, &info);
89 }
90
91 process_pending_signals(env);
92 }
93 }
94
95 void target_cpu_copy_regs(CPUArchState *env, struct target_pt_regs *regs)
96 {
97 env->gpr[HEX_REG_PC] = regs->sepc;
98 env->gpr[HEX_REG_SP] = regs->sp;
99 env->gpr[HEX_REG_USR] = 0x56000;
100 }