linux-user/hexagon/cpu_loop.c

   1 /*
   2  *  qemu user cpu loop
   3  *
   4  *  Copyright (c) 2003-2008 Fabrice Bellard
   5  *  Copyright(c) 2019-2021 Qualcomm Innovation Center, Inc. All Rights Reserved.
   6  *
   7  *  This program is free software; you can redistribute it and/or modify
   8  *  it under the terms of the GNU General Public License as published by
   9  *  the Free Software Foundation; either version 2 of the License, or
  10  *  (at your option) any later version.
  11  *
  12  *  This program is distributed in the hope that it will be useful,
  13  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  *  GNU General Public License for more details.
  16  *
  17  *  You should have received a copy of the GNU General Public License
  18  *  along with this program; if not, see <http://www.gnu.org/licenses/>.
  19  */
  20
  21 #include "qemu/osdep.h"
  22 #include "qemu.h"
  23 #include "user-internals.h"
  24 #include "cpu_loop-common.h"
  25 #include "signal-common.h"
  26 #include "internal.h"
  27
  28 void cpu_loop(CPUHexagonState *env)
  29 {
  30     CPUState *cs = env_cpu(env);
  31     int trapnr;
  32     target_ulong syscallnum;
  33     target_ulong ret;
  34
  35     for (;;) {
  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 EXCP_INTERRUPT:
  43             /* just indicate that signals should be handled asap */
  44             break;
  45         case HEX_EXCP_TRAP0:
  46             syscallnum = env->gpr[6];
  47             env->gpr[HEX_REG_PC] += 4;
  48             ret = do_syscall(env,
  49                              syscallnum,
  50                              env->gpr[0],
  51                              env->gpr[1],
  52                              env->gpr[2],
  53                              env->gpr[3],
  54                              env->gpr[4],
  55                              env->gpr[5],
  56                              0, 0);
  57             if (ret == -QEMU_ERESTARTSYS) {
  58                 env->gpr[HEX_REG_PC] -= 4;
  59             } else if (ret != -QEMU_ESIGRETURN) {
  60                 env->gpr[0] = ret;
  61             }
  62             break;
  63         case EXCP_ATOMIC:
  64             cpu_exec_step_atomic(cs);
  65             break;
  66         case EXCP_DEBUG:
  67             force_sig_fault(TARGET_SIGTRAP, TARGET_TRAP_BRKPT, 0);
  68             break;
  69         default:
  70             EXCP_DUMP(env, "\nqemu: unhandled CPU exception %#x - aborting\n",
  71                      trapnr);
  72             exit(EXIT_FAILURE);
  73         }
  74         process_pending_signals(env);
  75     }
  76 }
  77
  78 void target_cpu_copy_regs(CPUArchState *env, struct target_pt_regs *regs)
  79 {
  80     env->gpr[HEX_REG_PC] = regs->sepc;
  81     env->gpr[HEX_REG_SP] = regs->sp;
  82     env->gpr[HEX_REG_USR] = 0x56000;
  83 }