Merge tag 'pull-request-2022-09-28' of https://gitlab.com/thuth/qemu into staging
[qemu.git] / linux-user / m68k / 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.h"
22 #include "user-internals.h"
23 #include "cpu_loop-common.h"
24 #include "signal-common.h"
25
26 void cpu_loop(CPUM68KState *env)
27 {
28 CPUState *cs = env_cpu(env);
29 int trapnr;
30 unsigned int n;
31
32 for(;;) {
33 cpu_exec_start(cs);
34 trapnr = cpu_exec(cs);
35 cpu_exec_end(cs);
36 process_queued_cpu_work(cs);
37
38 switch(trapnr) {
39 case EXCP_ILLEGAL:
40 case EXCP_LINEA:
41 case EXCP_LINEF:
42 force_sig_fault(TARGET_SIGILL, TARGET_ILL_ILLOPN, env->pc);
43 break;
44 case EXCP_CHK:
45 case EXCP_TRAPCC:
46 force_sig_fault(TARGET_SIGFPE, TARGET_FPE_INTOVF, env->mmu.ar);
47 break;
48 case EXCP_DIV0:
49 force_sig_fault(TARGET_SIGFPE, TARGET_FPE_INTDIV, env->mmu.ar);
50 break;
51 case EXCP_TRACE:
52 force_sig_fault(TARGET_SIGTRAP, TARGET_TRAP_TRACE, env->mmu.ar);
53 break;
54 case EXCP_TRAP0:
55 {
56 abi_long ret;
57 n = env->dregs[0];
58 ret = do_syscall(env,
59 n,
60 env->dregs[1],
61 env->dregs[2],
62 env->dregs[3],
63 env->dregs[4],
64 env->dregs[5],
65 env->aregs[0],
66 0, 0);
67 if (ret == -QEMU_ERESTARTSYS) {
68 env->pc -= 2;
69 } else if (ret != -QEMU_ESIGRETURN) {
70 env->dregs[0] = ret;
71 }
72 }
73 break;
74 case EXCP_INTERRUPT:
75 /* just indicate that signals should be handled asap */
76 break;
77 case EXCP_TRAP0 + 1 ... EXCP_TRAP0 + 14:
78 force_sig_fault(TARGET_SIGILL, TARGET_ILL_ILLTRP, env->pc);
79 break;
80 case EXCP_DEBUG:
81 case EXCP_TRAP15:
82 force_sig_fault(TARGET_SIGTRAP, TARGET_TRAP_BRKPT, env->pc);
83 break;
84 case EXCP_ATOMIC:
85 cpu_exec_step_atomic(cs);
86 break;
87 default:
88 EXCP_DUMP(env, "qemu: unhandled CPU exception 0x%x - aborting\n", trapnr);
89 abort();
90 }
91 process_pending_signals(env);
92 }
93 }
94
95 void target_cpu_copy_regs(CPUArchState *env, struct target_pt_regs *regs)
96 {
97 CPUState *cpu = env_cpu(env);
98 TaskState *ts = cpu->opaque;
99 struct image_info *info = ts->info;
100
101 env->pc = regs->pc;
102 env->dregs[0] = regs->d0;
103 env->dregs[1] = regs->d1;
104 env->dregs[2] = regs->d2;
105 env->dregs[3] = regs->d3;
106 env->dregs[4] = regs->d4;
107 env->dregs[5] = regs->d5;
108 env->dregs[6] = regs->d6;
109 env->dregs[7] = regs->d7;
110 env->aregs[0] = regs->a0;
111 env->aregs[1] = regs->a1;
112 env->aregs[2] = regs->a2;
113 env->aregs[3] = regs->a3;
114 env->aregs[4] = regs->a4;
115 env->aregs[5] = regs->a5;
116 env->aregs[6] = regs->a6;
117 env->aregs[7] = regs->usp;
118 env->sr = regs->sr;
119
120 ts->stack_base = info->start_stack;
121 ts->heap_base = info->brk;
122 /* This will be filled in on the first SYS_HEAPINFO call. */
123 ts->heap_limit = 0;
124 }