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-common.h"
  22#include "qemu.h"
  23#include "cpu_loop-common.h"
  24
  25void cpu_loop(CPUM68KState *env)
  26{
  27    CPUState *cs = env_cpu(env);
  28    int trapnr;
  29    unsigned int n;
  30    target_siginfo_t info;
  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_HALT_INSN:
  40            /* Semihosing syscall.  */
  41            env->pc += 4;
  42            do_m68k_semihosting(env, env->dregs[0]);
  43            break;
  44        case EXCP_ILLEGAL:
  45        case EXCP_LINEA:
  46        case EXCP_LINEF:
  47            info.si_signo = TARGET_SIGILL;
  48            info.si_errno = 0;
  49            info.si_code = TARGET_ILL_ILLOPN;
  50            info._sifields._sigfault._addr = env->pc;
  51            queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info);
  52            break;
  53        case EXCP_CHK:
  54            info.si_signo = TARGET_SIGFPE;
  55            info.si_errno = 0;
  56            info.si_code = TARGET_FPE_INTOVF;
  57            info._sifields._sigfault._addr = env->pc;
  58            queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info);
  59            break;
  60        case EXCP_DIV0:
  61            info.si_signo = TARGET_SIGFPE;
  62            info.si_errno = 0;
  63            info.si_code = TARGET_FPE_INTDIV;
  64            info._sifields._sigfault._addr = env->pc;
  65            queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info);
  66            break;
  67        case EXCP_TRAP0:
  68            {
  69                abi_long ret;
  70                n = env->dregs[0];
  71                env->pc += 2;
  72                ret = do_syscall(env,
  73                                 n,
  74                                 env->dregs[1],
  75                                 env->dregs[2],
  76                                 env->dregs[3],
  77                                 env->dregs[4],
  78                                 env->dregs[5],
  79                                 env->aregs[0],
  80                                 0, 0);
  81                if (ret == -TARGET_ERESTARTSYS) {
  82                    env->pc -= 2;
  83                } else if (ret != -TARGET_QEMU_ESIGRETURN) {
  84                    env->dregs[0] = ret;
  85                }
  86            }
  87            break;
  88        case EXCP_INTERRUPT:
  89            /* just indicate that signals should be handled asap */
  90            break;
  91        case EXCP_ACCESS:
  92            {
  93                info.si_signo = TARGET_SIGSEGV;
  94                info.si_errno = 0;
  95                /* XXX: check env->error_code */
  96                info.si_code = TARGET_SEGV_MAPERR;
  97                info._sifields._sigfault._addr = env->mmu.ar;
  98                queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info);
  99            }
 100            break;
 101        case EXCP_DEBUG:
 102            info.si_signo = TARGET_SIGTRAP;
 103            info.si_errno = 0;
 104            info.si_code = TARGET_TRAP_BRKPT;
 105            queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info);
 106            break;
 107        case EXCP_ATOMIC:
 108            cpu_exec_step_atomic(cs);
 109            break;
 110        default:
 111            EXCP_DUMP(env, "qemu: unhandled CPU exception 0x%x - aborting\n", trapnr);
 112            abort();
 113        }
 114        process_pending_signals(env);
 115    }
 116}
 117
 118void target_cpu_copy_regs(CPUArchState *env, struct target_pt_regs *regs)
 119{
 120    CPUState *cpu = env_cpu(env);
 121    TaskState *ts = cpu->opaque;
 122    struct image_info *info = ts->info;
 123
 124    env->pc = regs->pc;
 125    env->dregs[0] = regs->d0;
 126    env->dregs[1] = regs->d1;
 127    env->dregs[2] = regs->d2;
 128    env->dregs[3] = regs->d3;
 129    env->dregs[4] = regs->d4;
 130    env->dregs[5] = regs->d5;
 131    env->dregs[6] = regs->d6;
 132    env->dregs[7] = regs->d7;
 133    env->aregs[0] = regs->a0;
 134    env->aregs[1] = regs->a1;
 135    env->aregs[2] = regs->a2;
 136    env->aregs[3] = regs->a3;
 137    env->aregs[4] = regs->a4;
 138    env->aregs[5] = regs->a5;
 139    env->aregs[6] = regs->a6;
 140    env->aregs[7] = regs->usp;
 141    env->sr = regs->sr;
 142
 143    ts->stack_base = info->start_stack;
 144    ts->heap_base = info->brk;
 145    /* This will be filled in on the first SYS_HEAPINFO call.  */
 146    ts->heap_limit = 0;
 147}
 148