Merge remote-tracking branch 'remotes/jsnow-gitlab/tags/python-pull-request' 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
32 while (1) {
33 bool arch_interrupt = true;
34
35 cpu_exec_start(cs);
36 trapnr = cpu_exec(cs);
37 cpu_exec_end(cs);
38 process_queued_cpu_work(cs);
39
40 switch (trapnr) {
41 case 0x160:
42 env->pc += 2;
43 ret = do_syscall(env,
44 env->gregs[3],
45 env->gregs[4],
46 env->gregs[5],
47 env->gregs[6],
48 env->gregs[7],
49 env->gregs[0],
50 env->gregs[1],
51 0, 0);
52 if (ret == -QEMU_ERESTARTSYS) {
53 env->pc -= 2;
54 } else if (ret != -QEMU_ESIGRETURN) {
55 env->gregs[0] = ret;
56 }
57 break;
58 case EXCP_INTERRUPT:
59 /* just indicate that signals should be handled asap */
60 break;
61 case EXCP_DEBUG:
62 force_sig_fault(TARGET_SIGTRAP, TARGET_TRAP_BRKPT, env->pc);
63 break;
64 case EXCP_ATOMIC:
65 cpu_exec_step_atomic(cs);
66 arch_interrupt = false;
67 break;
68 default:
69 fprintf(stderr, "Unhandled trap: 0x%x\n", trapnr);
70 cpu_dump_state(cs, stderr, 0);
71 exit(EXIT_FAILURE);
72 }
73 process_pending_signals (env);
74
75 /* Most of the traps imply an exception or interrupt, which
76 implies an REI instruction has been executed. Which means
77 that LDST (aka LOK_ADDR) should be cleared. But there are
78 a few exceptions for traps internal to QEMU. */
79 if (arch_interrupt) {
80 env->lock_addr = -1;
81 }
82 }
83 }
84
85 void target_cpu_copy_regs(CPUArchState *env, struct target_pt_regs *regs)
86 {
87 int i;
88
89 for(i = 0; i < 16; i++) {
90 env->gregs[i] = regs->regs[i];
91 }
92 env->pc = regs->pc;
93 }