LXR qemu/linux-user/m68k/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(CPUM68KState *env)
  27{
  28    CPUState *cs = env_cpu(env);
  29    int trapnr;
  30    unsigned int n;
  31
  32    for(;;) {
  33        cpu_exec_start(cs);
  34        trapnr = cpu_exec(cs);
  35        cpu_exec_end(cs);
  36        process_queued_cpu_work(cs);
  37
  38        switch(trapnr) {
  39        case EXCP_ILLEGAL:
  40        case EXCP_LINEA:
  41        case EXCP_LINEF:
  42            force_sig_fault(TARGET_SIGILL, TARGET_ILL_ILLOPN, env->pc);
  43            break;
  44        case EXCP_CHK:
  45        case EXCP_TRAPCC:
  46            force_sig_fault(TARGET_SIGFPE, TARGET_FPE_INTOVF, env->mmu.ar);
  47            break;
  48        case EXCP_DIV0:
  49            force_sig_fault(TARGET_SIGFPE, TARGET_FPE_INTDIV, env->mmu.ar);
  50            break;
  51        case EXCP_TRACE:
  52            force_sig_fault(TARGET_SIGTRAP, TARGET_TRAP_TRACE, env->mmu.ar);
  53            break;
  54        case EXCP_TRAP0:
  55            {
  56                abi_long ret;
  57                n = env->dregs[0];
  58                ret = do_syscall(env,
  59                                 n,
  60                                 env->dregs[1],
  61                                 env->dregs[2],
  62                                 env->dregs[3],
  63                                 env->dregs[4],
  64                                 env->dregs[5],
  65                                 env->aregs[0],
  66                                 0, 0);
  67                if (ret == -QEMU_ERESTARTSYS) {
  68                    env->pc -= 2;
  69                } else if (ret != -QEMU_ESIGRETURN) {
  70                    env->dregs[0] = ret;
  71                }
  72            }
  73            break;
  74        case EXCP_INTERRUPT:
  75            /* just indicate that signals should be handled asap */
  76            break;
  77        case EXCP_TRAP0 + 1 ... EXCP_TRAP0 + 14:
  78            force_sig_fault(TARGET_SIGILL, TARGET_ILL_ILLTRP, env->pc);
  79            break;
  80        case EXCP_DEBUG:
  81        case EXCP_TRAP15:
  82            force_sig_fault(TARGET_SIGTRAP, TARGET_TRAP_BRKPT, env->pc);
  83            break;
  84        case EXCP_ATOMIC:
  85            cpu_exec_step_atomic(cs);
  86            break;
  87        default:
  88            EXCP_DUMP(env, "qemu: unhandled CPU exception 0x%x - aborting\n", trapnr);
  89            abort();
  90        }
  91        process_pending_signals(env);
  92    }
  93}
  94
  95void target_cpu_copy_regs(CPUArchState *env, struct target_pt_regs *regs)
  96{
  97    CPUState *cpu = env_cpu(env);
  98    TaskState *ts = cpu->opaque;
  99    struct image_info *info = ts->info;
 100
 101    env->pc = regs->pc;
 102    env->dregs[0] = regs->d0;
 103    env->dregs[1] = regs->d1;
 104    env->dregs[2] = regs->d2;
 105    env->dregs[3] = regs->d3;
 106    env->dregs[4] = regs->d4;
 107    env->dregs[5] = regs->d5;
 108    env->dregs[6] = regs->d6;
 109    env->dregs[7] = regs->d7;
 110    env->aregs[0] = regs->a0;
 111    env->aregs[1] = regs->a1;
 112    env->aregs[2] = regs->a2;
 113    env->aregs[3] = regs->a3;
 114    env->aregs[4] = regs->a4;
 115    env->aregs[5] = regs->a5;
 116    env->aregs[6] = regs->a6;
 117    env->aregs[7] = regs->usp;
 118    env->sr = regs->sr;
 119
 120    ts->stack_base = info->start_stack;
 121    ts->heap_base = info->brk;
 122    /* This will be filled in on the first SYS_HEAPINFO call.  */
 123    ts->heap_limit = 0;
 124}
 125