linux-user/cris/cpu_loop.c

/*
 *  qemu user cpu loop
 *
 *  Copyright (c) 2003-2008 Fabrice Bellard
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, see <http://www.gnu.org/licenses/>.
 */

#include "qemu/osdep.h"
#include "qemu.h"
#include "cpu_loop-common.h"

void cpu_loop(CPUCRISState *env)
{
    CPUState *cs = CPU(cris_env_get_cpu(env));
    int trapnr, ret;
    target_siginfo_t info;
    
    while (1) {
        cpu_exec_start(cs);
        trapnr = cpu_exec(cs);
        cpu_exec_end(cs);
        process_queued_cpu_work(cs);

        switch (trapnr) {
        case 0xaa:
            {
                info.si_signo = TARGET_SIGSEGV;
                info.si_errno = 0;
                /* XXX: check env->error_code */
                info.si_code = TARGET_SEGV_MAPERR;
                info._sifields._sigfault._addr = env->pregs[PR_EDA];
                queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info);
            }
            break;
        case EXCP_INTERRUPT:
          /* just indicate that signals should be handled asap */
          break;
        case EXCP_BREAK:
            ret = do_syscall(env, 
                             env->regs[9], 
                             env->regs[10], 
                             env->regs[11], 
                             env->regs[12], 
                             env->regs[13], 
                             env->pregs[7], 
                             env->pregs[11],
                             0, 0);
            if (ret == -TARGET_ERESTARTSYS) {
                env->pc -= 2;
            } else if (ret != -TARGET_QEMU_ESIGRETURN) {
                env->regs[10] = ret;
            }
            break;
        case EXCP_DEBUG:
            {
                int sig;

                sig = gdb_handlesig(cs, TARGET_SIGTRAP);
                if (sig)
                  {
                    info.si_signo = sig;
                    info.si_errno = 0;
                    info.si_code = TARGET_TRAP_BRKPT;
                    queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info);
                  }
            }
            break;
        case EXCP_ATOMIC:
            cpu_exec_step_atomic(cs);
            break;
        default:
            printf ("Unhandled trap: 0x%x\n", trapnr);
            cpu_dump_state(cs, stderr, fprintf, 0);
            exit(EXIT_FAILURE);
        }
        process_pending_signals (env);
    }
}

void target_cpu_copy_regs(CPUArchState *env, struct target_pt_regs *regs)
{
    CPUState *cpu = ENV_GET_CPU(env);
    TaskState *ts = cpu->opaque;
    struct image_info *info = ts->info;

    env->regs[0] = regs->r0;
    env->regs[1] = regs->r1;
    env->regs[2] = regs->r2;
    env->regs[3] = regs->r3;
    env->regs[4] = regs->r4;
    env->regs[5] = regs->r5;
    env->regs[6] = regs->r6;
    env->regs[7] = regs->r7;
    env->regs[8] = regs->r8;
    env->regs[9] = regs->r9;
    env->regs[10] = regs->r10;
    env->regs[11] = regs->r11;
    env->regs[12] = regs->r12;
    env->regs[13] = regs->r13;
    env->regs[14] = info->start_stack;
    env->regs[15] = regs->acr;
    env->pc = regs->erp;
}