xref: /qemu/linux-user/m68k/cpu_loop.c (revision 71dc6f7488d5dd18b92bbe54cbb165132332a17c)
1cd71c089SLaurent Vivier /*
2cd71c089SLaurent Vivier  *  qemu user cpu loop
3cd71c089SLaurent Vivier  *
4cd71c089SLaurent Vivier  *  Copyright (c) 2003-2008 Fabrice Bellard
5cd71c089SLaurent Vivier  *
6cd71c089SLaurent Vivier  *  This program is free software; you can redistribute it and/or modify
7cd71c089SLaurent Vivier  *  it under the terms of the GNU General Public License as published by
8cd71c089SLaurent Vivier  *  the Free Software Foundation; either version 2 of the License, or
9cd71c089SLaurent Vivier  *  (at your option) any later version.
10cd71c089SLaurent Vivier  *
11cd71c089SLaurent Vivier  *  This program is distributed in the hope that it will be useful,
12cd71c089SLaurent Vivier  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
13cd71c089SLaurent Vivier  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14cd71c089SLaurent Vivier  *  GNU General Public License for more details.
15cd71c089SLaurent Vivier  *
16cd71c089SLaurent Vivier  *  You should have received a copy of the GNU General Public License
17cd71c089SLaurent Vivier  *  along with this program; if not, see <http://www.gnu.org/licenses/>.
18cd71c089SLaurent Vivier  */
19cd71c089SLaurent Vivier 
20cd71c089SLaurent Vivier #include "qemu/osdep.h"
21a8d25326SMarkus Armbruster #include "qemu-common.h"
22cd71c089SLaurent Vivier #include "qemu.h"
233b249d26SPeter Maydell #include "user-internals.h"
24cd71c089SLaurent Vivier #include "cpu_loop-common.h"
252113aed6SPeter Maydell #include "signal-common.h"
26cd71c089SLaurent Vivier 
27ff9803b1SLaurent Vivier void cpu_loop(CPUM68KState *env)
28ff9803b1SLaurent Vivier {
29a8d92fd8SRichard Henderson     CPUState *cs = env_cpu(env);
30ff9803b1SLaurent Vivier     int trapnr;
31ff9803b1SLaurent Vivier     unsigned int n;
32ff9803b1SLaurent Vivier 
33ff9803b1SLaurent Vivier     for(;;) {
34ff9803b1SLaurent Vivier         cpu_exec_start(cs);
35ff9803b1SLaurent Vivier         trapnr = cpu_exec(cs);
36ff9803b1SLaurent Vivier         cpu_exec_end(cs);
37ff9803b1SLaurent Vivier         process_queued_cpu_work(cs);
38ff9803b1SLaurent Vivier 
39ff9803b1SLaurent Vivier         switch(trapnr) {
40ff9803b1SLaurent Vivier         case EXCP_HALT_INSN:
41ff9803b1SLaurent Vivier             /* Semihosing syscall.  */
42ff9803b1SLaurent Vivier             env->pc += 4;
43ff9803b1SLaurent Vivier             do_m68k_semihosting(env, env->dregs[0]);
44ff9803b1SLaurent Vivier             break;
45c6d0700fSLaurent Vivier         case EXCP_ILLEGAL:
46ff9803b1SLaurent Vivier         case EXCP_LINEA:
47ff9803b1SLaurent Vivier         case EXCP_LINEF:
48*71dc6f74SRichard Henderson             force_sig_fault(TARGET_SIGILL, TARGET_ILL_ILLOPN, env->pc);
49ff9803b1SLaurent Vivier             break;
50ff9803b1SLaurent Vivier         case EXCP_CHK:
51*71dc6f74SRichard Henderson             force_sig_fault(TARGET_SIGFPE, TARGET_FPE_INTOVF, env->pc);
52ff9803b1SLaurent Vivier             break;
53ff9803b1SLaurent Vivier         case EXCP_DIV0:
54*71dc6f74SRichard Henderson             force_sig_fault(TARGET_SIGFPE, TARGET_FPE_INTDIV, env->pc);
55ff9803b1SLaurent Vivier             break;
56ff9803b1SLaurent Vivier         case EXCP_TRAP0:
57ff9803b1SLaurent Vivier             {
58ff9803b1SLaurent Vivier                 abi_long ret;
59ff9803b1SLaurent Vivier                 n = env->dregs[0];
60ff9803b1SLaurent Vivier                 env->pc += 2;
61ff9803b1SLaurent Vivier                 ret = do_syscall(env,
62ff9803b1SLaurent Vivier                                  n,
63ff9803b1SLaurent Vivier                                  env->dregs[1],
64ff9803b1SLaurent Vivier                                  env->dregs[2],
65ff9803b1SLaurent Vivier                                  env->dregs[3],
66ff9803b1SLaurent Vivier                                  env->dregs[4],
67ff9803b1SLaurent Vivier                                  env->dregs[5],
68ff9803b1SLaurent Vivier                                  env->aregs[0],
69ff9803b1SLaurent Vivier                                  0, 0);
70af254a27SRichard Henderson                 if (ret == -QEMU_ERESTARTSYS) {
71ff9803b1SLaurent Vivier                     env->pc -= 2;
7257a0c938SRichard Henderson                 } else if (ret != -QEMU_ESIGRETURN) {
73ff9803b1SLaurent Vivier                     env->dregs[0] = ret;
74ff9803b1SLaurent Vivier                 }
75ff9803b1SLaurent Vivier             }
76ff9803b1SLaurent Vivier             break;
77ff9803b1SLaurent Vivier         case EXCP_INTERRUPT:
78ff9803b1SLaurent Vivier             /* just indicate that signals should be handled asap */
79ff9803b1SLaurent Vivier             break;
80ff9803b1SLaurent Vivier         case EXCP_DEBUG:
81*71dc6f74SRichard Henderson             force_sig_fault(TARGET_SIGTRAP, TARGET_TRAP_BRKPT, env->pc);
82ff9803b1SLaurent Vivier             break;
83ff9803b1SLaurent Vivier         case EXCP_ATOMIC:
84ff9803b1SLaurent Vivier             cpu_exec_step_atomic(cs);
85ff9803b1SLaurent Vivier             break;
86ff9803b1SLaurent Vivier         default:
87ff9803b1SLaurent Vivier             EXCP_DUMP(env, "qemu: unhandled CPU exception 0x%x - aborting\n", trapnr);
88ff9803b1SLaurent Vivier             abort();
89ff9803b1SLaurent Vivier         }
90ff9803b1SLaurent Vivier         process_pending_signals(env);
91ff9803b1SLaurent Vivier     }
92ff9803b1SLaurent Vivier }
93ff9803b1SLaurent Vivier 
94cd71c089SLaurent Vivier void target_cpu_copy_regs(CPUArchState *env, struct target_pt_regs *regs)
95cd71c089SLaurent Vivier {
9629a0af61SRichard Henderson     CPUState *cpu = env_cpu(env);
97ff9803b1SLaurent Vivier     TaskState *ts = cpu->opaque;
98ff9803b1SLaurent Vivier     struct image_info *info = ts->info;
99ff9803b1SLaurent Vivier 
100ff9803b1SLaurent Vivier     env->pc = regs->pc;
101ff9803b1SLaurent Vivier     env->dregs[0] = regs->d0;
102ff9803b1SLaurent Vivier     env->dregs[1] = regs->d1;
103ff9803b1SLaurent Vivier     env->dregs[2] = regs->d2;
104ff9803b1SLaurent Vivier     env->dregs[3] = regs->d3;
105ff9803b1SLaurent Vivier     env->dregs[4] = regs->d4;
106ff9803b1SLaurent Vivier     env->dregs[5] = regs->d5;
107ff9803b1SLaurent Vivier     env->dregs[6] = regs->d6;
108ff9803b1SLaurent Vivier     env->dregs[7] = regs->d7;
109ff9803b1SLaurent Vivier     env->aregs[0] = regs->a0;
110ff9803b1SLaurent Vivier     env->aregs[1] = regs->a1;
111ff9803b1SLaurent Vivier     env->aregs[2] = regs->a2;
112ff9803b1SLaurent Vivier     env->aregs[3] = regs->a3;
113ff9803b1SLaurent Vivier     env->aregs[4] = regs->a4;
114ff9803b1SLaurent Vivier     env->aregs[5] = regs->a5;
115ff9803b1SLaurent Vivier     env->aregs[6] = regs->a6;
116ff9803b1SLaurent Vivier     env->aregs[7] = regs->usp;
117ff9803b1SLaurent Vivier     env->sr = regs->sr;
118ff9803b1SLaurent Vivier 
119ff9803b1SLaurent Vivier     ts->stack_base = info->start_stack;
120ff9803b1SLaurent Vivier     ts->heap_base = info->brk;
121ff9803b1SLaurent Vivier     /* This will be filled in on the first SYS_HEAPINFO call.  */
122ff9803b1SLaurent Vivier     ts->heap_limit = 0;
123cd71c089SLaurent Vivier }
124