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.h"
  23#include "cpu_loop-common.h"
  24#include "internal.h"
  25
  26void cpu_loop(CPUHexagonState *env)
  27{
  28    CPUState *cs = env_cpu(env);
  29    int trapnr, signum, sigcode;
  30    target_ulong sigaddr;
  31    target_ulong syscallnum;
  32    target_ulong ret;
  33
  34    for (;;) {
  35        cpu_exec_start(cs);
  36        trapnr = cpu_exec(cs);
  37        cpu_exec_end(cs);
  38        process_queued_cpu_work(cs);
  39
  40        signum = 0;
  41        sigcode = 0;
  42        sigaddr = 0;
  43
  44        switch (trapnr) {
  45        case EXCP_INTERRUPT:
  46            /* just indicate that signals should be handled asap */
  47            break;
  48        case HEX_EXCP_TRAP0:
  49            syscallnum = env->gpr[6];
  50            env->gpr[HEX_REG_PC] += 4;
  51            ret = do_syscall(env,
  52                             syscallnum,
  53                             env->gpr[0],
  54                             env->gpr[1],
  55                             env->gpr[2],
  56                             env->gpr[3],
  57                             env->gpr[4],
  58                             env->gpr[5],
  59                             0, 0);
  60            if (ret == -TARGET_ERESTARTSYS) {
  61                env->gpr[HEX_REG_PC] -= 4;
  62            } else if (ret != -TARGET_QEMU_ESIGRETURN) {
  63                env->gpr[0] = ret;
  64            }
  65            break;
  66        case HEX_EXCP_FETCH_NO_UPAGE:
  67        case HEX_EXCP_PRIV_NO_UREAD:
  68        case HEX_EXCP_PRIV_NO_UWRITE:
  69            signum = TARGET_SIGSEGV;
  70            sigcode = TARGET_SEGV_MAPERR;
  71            break;
  72        case EXCP_ATOMIC:
  73            cpu_exec_step_atomic(cs);
  74            break;
  75        default:
  76            EXCP_DUMP(env, "\nqemu: unhandled CPU exception %#x - aborting\n",
  77                     trapnr);
  78            exit(EXIT_FAILURE);
  79        }
  80
  81        if (signum) {
  82            target_siginfo_t info = {
  83                .si_signo = signum,
  84                .si_errno = 0,
  85                .si_code = sigcode,
  86                ._sifields._sigfault._addr = sigaddr
  87            };
  88            queue_signal(env, info.si_signo, QEMU_SI_KILL, &info);
  89        }
  90
  91        process_pending_signals(env);
  92    }
  93}
  94
  95void target_cpu_copy_regs(CPUArchState *env, struct target_pt_regs *regs)
  96{
  97    env->gpr[HEX_REG_PC] = regs->sepc;
  98    env->gpr[HEX_REG_SP] = regs->sp;
  99    env->gpr[HEX_REG_USR] = 0x56000;
 100}
 101