Merge remote-tracking branch 'remotes/mcayland/tags/qemu-openbios-20220115' into...
[qemu.git] / linux-user / sh4 / cpu_loop.c
1 /*
2 * qemu user cpu loop
3 *
4 * Copyright (c) 2003-2008 Fabrice Bellard
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, see <http://www.gnu.org/licenses/>.
18 */
19
20 #include "qemu/osdep.h"
21 #include "qemu-common.h"
22 #include "qemu.h"
23 #include "user-internals.h"
24 #include "cpu_loop-common.h"
25 #include "signal-common.h"
26
27 void cpu_loop(CPUSH4State *env)
28 {
29 CPUState *cs = env_cpu(env);
30 int trapnr, ret;
31 target_siginfo_t info;
32
33 while (1) {
34 bool arch_interrupt = true;
35
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 0x160:
43 env->pc += 2;
44 ret = do_syscall(env,
45 env->gregs[3],
46 env->gregs[4],
47 env->gregs[5],
48 env->gregs[6],
49 env->gregs[7],
50 env->gregs[0],
51 env->gregs[1],
52 0, 0);
53 if (ret == -TARGET_ERESTARTSYS) {
54 env->pc -= 2;
55 } else if (ret != -TARGET_QEMU_ESIGRETURN) {
56 env->gregs[0] = ret;
57 }
58 break;
59 case EXCP_INTERRUPT:
60 /* just indicate that signals should be handled asap */
61 break;
62 case EXCP_DEBUG:
63 info.si_signo = TARGET_SIGTRAP;
64 info.si_errno = 0;
65 info.si_code = TARGET_TRAP_BRKPT;
66 queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info);
67 break;
68 case EXCP_ATOMIC:
69 cpu_exec_step_atomic(cs);
70 arch_interrupt = false;
71 break;
72 default:
73 fprintf(stderr, "Unhandled trap: 0x%x\n", trapnr);
74 cpu_dump_state(cs, stderr, 0);
75 exit(EXIT_FAILURE);
76 }
77 process_pending_signals (env);
78
79 /* Most of the traps imply an exception or interrupt, which
80 implies an REI instruction has been executed. Which means
81 that LDST (aka LOK_ADDR) should be cleared. But there are
82 a few exceptions for traps internal to QEMU. */
83 if (arch_interrupt) {
84 env->lock_addr = -1;
85 }
86 }
87 }
88
89 void target_cpu_copy_regs(CPUArchState *env, struct target_pt_regs *regs)
90 {
91 int i;
92
93 for(i = 0; i < 16; i++) {
94 env->gregs[i] = regs->regs[i];
95 }
96 env->pc = regs->pc;
97 }