linux-user/cris/cpu_loop.c

   1 /*
   2  *  qemu user cpu loop
   3  *
   4  *  Copyright (c) 2003-2008 Fabrice Bellard
   5  *
   6  *  This program is free software; you can redistribute it and/or modify
   7  *  it under the terms of the GNU General Public License as published by
   8  *  the Free Software Foundation; either version 2 of the License, or
   9  *  (at your option) any later version.
  10  *
  11  *  This program is distributed in the hope that it will be useful,
  12  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *  GNU General Public License for more details.
  15  *
  16  *  You should have received a copy of the GNU General Public License
  17  *  along with this program; if not, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 #include "qemu/osdep.h"
  21 #include "qemu.h"
  22 #include "user-internals.h"
  23 #include "cpu_loop-common.h"
  24 #include "signal-common.h"
  25
  26 void cpu_loop(CPUCRISState *env)
  27 {
  28     CPUState *cs = env_cpu(env);
  29     int trapnr, ret;
  30
  31     while (1) {
  32         cpu_exec_start(cs);
  33         trapnr = cpu_exec(cs);
  34         cpu_exec_end(cs);
  35         process_queued_cpu_work(cs);
  36
  37         switch (trapnr) {
  38         case EXCP_INTERRUPT:
  39             /* just indicate that signals should be handled asap */
  40             break;
  41         case EXCP_BREAK:
  42             ret = do_syscall(env,
  43                              env->regs[9],
  44                              env->regs[10],
  45                              env->regs[11],
  46                              env->regs[12],
  47                              env->regs[13],
  48                              env->pregs[7],
  49                              env->pregs[11],
  50                              0, 0);
  51             if (ret == -QEMU_ERESTARTSYS) {
  52                 env->pc -= 2;
  53             } else if (ret != -QEMU_ESIGRETURN) {
  54                 env->regs[10] = ret;
  55             }
  56             break;
  57         case EXCP_DEBUG:
  58             force_sig_fault(TARGET_SIGTRAP, TARGET_TRAP_BRKPT, env->pc);
  59             break;
  60         case EXCP_ATOMIC:
  61             cpu_exec_step_atomic(cs);
  62             break;
  63         default:
  64             fprintf(stderr, "Unhandled trap: 0x%x\n", trapnr);
  65             cpu_dump_state(cs, stderr, 0);
  66             exit(EXIT_FAILURE);
  67         }
  68         process_pending_signals (env);
  69     }
  70 }
  71
  72 void target_cpu_copy_regs(CPUArchState *env, struct target_pt_regs *regs)
  73 {
  74     CPUState *cpu = env_cpu(env);
  75     TaskState *ts = get_task_state(cpu);
  76     struct image_info *info = ts->info;
  77
  78     env->regs[0] = regs->r0;
  79     env->regs[1] = regs->r1;
  80     env->regs[2] = regs->r2;
  81     env->regs[3] = regs->r3;
  82     env->regs[4] = regs->r4;
  83     env->regs[5] = regs->r5;
  84     env->regs[6] = regs->r6;
  85     env->regs[7] = regs->r7;
  86     env->regs[8] = regs->r8;
  87     env->regs[9] = regs->r9;
  88     env->regs[10] = regs->r10;
  89     env->regs[11] = regs->r11;
  90     env->regs[12] = regs->r12;
  91     env->regs[13] = regs->r13;
  92     env->regs[14] = info->start_stack;
  93     env->regs[15] = regs->acr;
  94     env->pc = regs->erp;
  95 }