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