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 "cpu_loop-common.h"
  24 #include "internal.h"
  25
  26 void cpu_loop(CPUHexagonState *env)
  27 {
  28     CPUState *cs = CPU(hexagon_env_get_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
  95 void 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 }