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 "user-internals.h"
  24#include "cpu_loop-common.h"
  25#include "signal-common.h"
  26
  27void cpu_loop(CPUM68KState *env)
  28{
  29    CPUState *cs = env_cpu(env);
  30    int trapnr;
  31    unsigned int n;
  32    target_siginfo_t info;
  33
  34    for(;;) {
  35        cpu_exec_start(cs);
  36        trapnr = cpu_exec(cs);
  37        cpu_exec_end(cs);
  38        process_queued_cpu_work(cs);
  39
  40        switch(trapnr) {
  41        case EXCP_HALT_INSN:
  42            /* Semihosing syscall.  */
  43            env->pc += 4;
  44            do_m68k_semihosting(env, env->dregs[0]);
  45            break;
  46        case EXCP_ILLEGAL:
  47        case EXCP_LINEA:
  48        case EXCP_LINEF:
  49            info.si_signo = TARGET_SIGILL;
  50            info.si_errno = 0;
  51            info.si_code = TARGET_ILL_ILLOPN;
  52            info._sifields._sigfault._addr = env->pc;
  53            queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info);
  54            break;
  55        case EXCP_CHK:
  56            info.si_signo = TARGET_SIGFPE;
  57            info.si_errno = 0;
  58            info.si_code = TARGET_FPE_INTOVF;
  59            info._sifields._sigfault._addr = env->pc;
  60            queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info);
  61            break;
  62        case EXCP_DIV0:
  63            info.si_signo = TARGET_SIGFPE;
  64            info.si_errno = 0;
  65            info.si_code = TARGET_FPE_INTDIV;
  66            info._sifields._sigfault._addr = env->pc;
  67            queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info);
  68            break;
  69        case EXCP_TRAP0:
  70            {
  71                abi_long ret;
  72                n = env->dregs[0];
  73                env->pc += 2;
  74                ret = do_syscall(env,
  75                                 n,
  76                                 env->dregs[1],
  77                                 env->dregs[2],
  78                                 env->dregs[3],
  79                                 env->dregs[4],
  80                                 env->dregs[5],
  81                                 env->aregs[0],
  82                                 0, 0);
  83                if (ret == -TARGET_ERESTARTSYS) {
  84                    env->pc -= 2;
  85                } else if (ret != -TARGET_QEMU_ESIGRETURN) {
  86                    env->dregs[0] = ret;
  87                }
  88            }
  89            break;
  90        case EXCP_INTERRUPT:
  91            /* just indicate that signals should be handled asap */
  92            break;
  93        case EXCP_DEBUG:
  94            info.si_signo = TARGET_SIGTRAP;
  95            info.si_errno = 0;
  96            info.si_code = TARGET_TRAP_BRKPT;
  97            queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info);
  98            break;
  99        case EXCP_ATOMIC:
 100            cpu_exec_step_atomic(cs);
 101            break;
 102        default:
 103            EXCP_DUMP(env, "qemu: unhandled CPU exception 0x%x - aborting\n", trapnr);
 104            abort();
 105        }
 106        process_pending_signals(env);
 107    }
 108}
 109
 110void target_cpu_copy_regs(CPUArchState *env, struct target_pt_regs *regs)
 111{
 112    CPUState *cpu = env_cpu(env);
 113    TaskState *ts = cpu->opaque;
 114    struct image_info *info = ts->info;
 115
 116    env->pc = regs->pc;
 117    env->dregs[0] = regs->d0;
 118    env->dregs[1] = regs->d1;
 119    env->dregs[2] = regs->d2;
 120    env->dregs[3] = regs->d3;
 121    env->dregs[4] = regs->d4;
 122    env->dregs[5] = regs->d5;
 123    env->dregs[6] = regs->d6;
 124    env->dregs[7] = regs->d7;
 125    env->aregs[0] = regs->a0;
 126    env->aregs[1] = regs->a1;
 127    env->aregs[2] = regs->a2;
 128    env->aregs[3] = regs->a3;
 129    env->aregs[4] = regs->a4;
 130    env->aregs[5] = regs->a5;
 131    env->aregs[6] = regs->a6;
 132    env->aregs[7] = regs->usp;
 133    env->sr = regs->sr;
 134
 135    ts->stack_base = info->start_stack;
 136    ts->heap_base = info->brk;
 137    /* This will be filled in on the first SYS_HEAPINFO call.  */
 138    ts->heap_limit = 0;
 139}
 140