LXR qemu/linux-user/cris/cpu

   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
  26void 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
  72void target_cpu_copy_regs(CPUArchState *env, struct target_pt_regs *regs)
  73{
  74    CPUState *cpu = env_cpu(env);
  75    TaskState *ts = cpu->opaque;
  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}
  96