LXR qemu/linux-user/hexagon/cpu

   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-common.h"
  23#include "qemu.h"
  24#include "user-internals.h"
  25#include "cpu_loop-common.h"
  26#include "signal-common.h"
  27#include "internal.h"
  28
  29void cpu_loop(CPUHexagonState *env)
  30{
  31    CPUState *cs = env_cpu(env);
  32    int trapnr;
  33    target_ulong syscallnum;
  34    target_ulong ret;
  35
  36    for (;;) {
  37        cpu_exec_start(cs);
  38        trapnr = cpu_exec(cs);
  39        cpu_exec_end(cs);
  40        process_queued_cpu_work(cs);
  41
  42        switch (trapnr) {
  43        case EXCP_INTERRUPT:
  44            /* just indicate that signals should be handled asap */
  45            break;
  46        case HEX_EXCP_TRAP0:
  47            syscallnum = env->gpr[6];
  48            env->gpr[HEX_REG_PC] += 4;
  49            ret = do_syscall(env,
  50                             syscallnum,
  51                             env->gpr[0],
  52                             env->gpr[1],
  53                             env->gpr[2],
  54                             env->gpr[3],
  55                             env->gpr[4],
  56                             env->gpr[5],
  57                             0, 0);
  58            if (ret == -QEMU_ERESTARTSYS) {
  59                env->gpr[HEX_REG_PC] -= 4;
  60            } else if (ret != -QEMU_ESIGRETURN) {
  61                env->gpr[0] = ret;
  62            }
  63            break;
  64        case EXCP_ATOMIC:
  65            cpu_exec_step_atomic(cs);
  66            break;
  67        default:
  68            EXCP_DUMP(env, "\nqemu: unhandled CPU exception %#x - aborting\n",
  69                     trapnr);
  70            exit(EXIT_FAILURE);
  71        }
  72        process_pending_signals(env);
  73    }
  74}
  75
  76void target_cpu_copy_regs(CPUArchState *env, struct target_pt_regs *regs)
  77{
  78    env->gpr[HEX_REG_PC] = regs->sepc;
  79    env->gpr[HEX_REG_SP] = regs->sp;
  80    env->gpr[HEX_REG_USR] = 0x56000;
  81}
  82