xref: /qemu/linux-user/hexagon/cpu_loop.c (revision d2a56bd242de92961c7804f9dabac2d27139d16a) 
1*d2a56bd2STaylor Simpson /*
2*d2a56bd2STaylor Simpson  *  qemu user cpu loop
3*d2a56bd2STaylor Simpson  *
4*d2a56bd2STaylor Simpson  *  Copyright (c) 2003-2008 Fabrice Bellard
5*d2a56bd2STaylor Simpson  *  Copyright(c) 2019-2021 Qualcomm Innovation Center, Inc. All Rights Reserved.
6*d2a56bd2STaylor Simpson  *
7*d2a56bd2STaylor Simpson  *  This program is free software; you can redistribute it and/or modify
8*d2a56bd2STaylor Simpson  *  it under the terms of the GNU General Public License as published by
9*d2a56bd2STaylor Simpson  *  the Free Software Foundation; either version 2 of the License, or
10*d2a56bd2STaylor Simpson  *  (at your option) any later version.
11*d2a56bd2STaylor Simpson  *
12*d2a56bd2STaylor Simpson  *  This program is distributed in the hope that it will be useful,
13*d2a56bd2STaylor Simpson  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
14*d2a56bd2STaylor Simpson  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15*d2a56bd2STaylor Simpson  *  GNU General Public License for more details.
16*d2a56bd2STaylor Simpson  *
17*d2a56bd2STaylor Simpson  *  You should have received a copy of the GNU General Public License
18*d2a56bd2STaylor Simpson  *  along with this program; if not, see <http://www.gnu.org/licenses/>.
19*d2a56bd2STaylor Simpson  */
20*d2a56bd2STaylor Simpson 
21*d2a56bd2STaylor Simpson #include "qemu/osdep.h"
22*d2a56bd2STaylor Simpson #include "qemu.h"
23*d2a56bd2STaylor Simpson #include "cpu_loop-common.h"
24*d2a56bd2STaylor Simpson #include "internal.h"
25*d2a56bd2STaylor Simpson 
26*d2a56bd2STaylor Simpson void cpu_loop(CPUHexagonState *env)
27*d2a56bd2STaylor Simpson {
28*d2a56bd2STaylor Simpson     CPUState *cs = CPU(hexagon_env_get_cpu(env));
29*d2a56bd2STaylor Simpson     int trapnr, signum, sigcode;
30*d2a56bd2STaylor Simpson     target_ulong sigaddr;
31*d2a56bd2STaylor Simpson     target_ulong syscallnum;
32*d2a56bd2STaylor Simpson     target_ulong ret;
33*d2a56bd2STaylor Simpson 
34*d2a56bd2STaylor Simpson     for (;;) {
35*d2a56bd2STaylor Simpson         cpu_exec_start(cs);
36*d2a56bd2STaylor Simpson         trapnr = cpu_exec(cs);
37*d2a56bd2STaylor Simpson         cpu_exec_end(cs);
38*d2a56bd2STaylor Simpson         process_queued_cpu_work(cs);
39*d2a56bd2STaylor Simpson 
40*d2a56bd2STaylor Simpson         signum = 0;
41*d2a56bd2STaylor Simpson         sigcode = 0;
42*d2a56bd2STaylor Simpson         sigaddr = 0;
43*d2a56bd2STaylor Simpson 
44*d2a56bd2STaylor Simpson         switch (trapnr) {
45*d2a56bd2STaylor Simpson         case EXCP_INTERRUPT:
46*d2a56bd2STaylor Simpson             /* just indicate that signals should be handled asap */
47*d2a56bd2STaylor Simpson             break;
48*d2a56bd2STaylor Simpson         case HEX_EXCP_TRAP0:
49*d2a56bd2STaylor Simpson             syscallnum = env->gpr[6];
50*d2a56bd2STaylor Simpson             env->gpr[HEX_REG_PC] += 4;
51*d2a56bd2STaylor Simpson             ret = do_syscall(env,
52*d2a56bd2STaylor Simpson                              syscallnum,
53*d2a56bd2STaylor Simpson                              env->gpr[0],
54*d2a56bd2STaylor Simpson                              env->gpr[1],
55*d2a56bd2STaylor Simpson                              env->gpr[2],
56*d2a56bd2STaylor Simpson                              env->gpr[3],
57*d2a56bd2STaylor Simpson                              env->gpr[4],
58*d2a56bd2STaylor Simpson                              env->gpr[5],
59*d2a56bd2STaylor Simpson                              0, 0);
60*d2a56bd2STaylor Simpson             if (ret == -TARGET_ERESTARTSYS) {
61*d2a56bd2STaylor Simpson                 env->gpr[HEX_REG_PC] -= 4;
62*d2a56bd2STaylor Simpson             } else if (ret != -TARGET_QEMU_ESIGRETURN) {
63*d2a56bd2STaylor Simpson                 env->gpr[0] = ret;
64*d2a56bd2STaylor Simpson             }
65*d2a56bd2STaylor Simpson             break;
66*d2a56bd2STaylor Simpson         case HEX_EXCP_FETCH_NO_UPAGE:
67*d2a56bd2STaylor Simpson         case HEX_EXCP_PRIV_NO_UREAD:
68*d2a56bd2STaylor Simpson         case HEX_EXCP_PRIV_NO_UWRITE:
69*d2a56bd2STaylor Simpson             signum = TARGET_SIGSEGV;
70*d2a56bd2STaylor Simpson             sigcode = TARGET_SEGV_MAPERR;
71*d2a56bd2STaylor Simpson             break;
72*d2a56bd2STaylor Simpson         case EXCP_ATOMIC:
73*d2a56bd2STaylor Simpson             cpu_exec_step_atomic(cs);
74*d2a56bd2STaylor Simpson             break;
75*d2a56bd2STaylor Simpson         default:
76*d2a56bd2STaylor Simpson             EXCP_DUMP(env, "\nqemu: unhandled CPU exception %#x - aborting\n",
77*d2a56bd2STaylor Simpson                      trapnr);
78*d2a56bd2STaylor Simpson             exit(EXIT_FAILURE);
79*d2a56bd2STaylor Simpson         }
80*d2a56bd2STaylor Simpson 
81*d2a56bd2STaylor Simpson         if (signum) {
82*d2a56bd2STaylor Simpson             target_siginfo_t info = {
83*d2a56bd2STaylor Simpson                 .si_signo = signum,
84*d2a56bd2STaylor Simpson                 .si_errno = 0,
85*d2a56bd2STaylor Simpson                 .si_code = sigcode,
86*d2a56bd2STaylor Simpson                 ._sifields._sigfault._addr = sigaddr
87*d2a56bd2STaylor Simpson             };
88*d2a56bd2STaylor Simpson             queue_signal(env, info.si_signo, QEMU_SI_KILL, &info);
89*d2a56bd2STaylor Simpson         }
90*d2a56bd2STaylor Simpson 
91*d2a56bd2STaylor Simpson         process_pending_signals(env);
92*d2a56bd2STaylor Simpson     }
93*d2a56bd2STaylor Simpson }
94*d2a56bd2STaylor Simpson 
95*d2a56bd2STaylor Simpson void target_cpu_copy_regs(CPUArchState *env, struct target_pt_regs *regs)
96*d2a56bd2STaylor Simpson {
97*d2a56bd2STaylor Simpson     env->gpr[HEX_REG_PC] = regs->sepc;
98*d2a56bd2STaylor Simpson     env->gpr[HEX_REG_SP] = regs->sp;
99*d2a56bd2STaylor Simpson     env->gpr[HEX_REG_USR] = 0x56000;
100*d2a56bd2STaylor Simpson }
101