linux-user/m68k/cpu_loop.c

   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
  25 void cpu_loop(CPUM68KState *env)
  26 {
  27     CPUState *cs = env_cpu(env);
  28     int trapnr;
  29     unsigned int n;
  30     target_siginfo_t info;
  31     TaskState *ts = cs->opaque;
  32
  33     for(;;) {
  34         cpu_exec_start(cs);
  35         trapnr = cpu_exec(cs);
  36         cpu_exec_end(cs);
  37         process_queued_cpu_work(cs);
  38
  39         switch(trapnr) {
  40         case EXCP_ILLEGAL:
  41             {
  42                 if (ts->sim_syscalls) {
  43                     uint16_t nr;
  44                     get_user_u16(nr, env->pc + 2);
  45                     env->pc += 4;
  46                     do_m68k_simcall(env, nr);
  47                 } else {
  48                     goto do_sigill;
  49                 }
  50             }
  51             break;
  52         case EXCP_HALT_INSN:
  53             /* Semihosing syscall.  */
  54             env->pc += 4;
  55             do_m68k_semihosting(env, env->dregs[0]);
  56             break;
  57         case EXCP_LINEA:
  58         case EXCP_LINEF:
  59         do_sigill:
  60             info.si_signo = TARGET_SIGILL;
  61             info.si_errno = 0;
  62             info.si_code = TARGET_ILL_ILLOPN;
  63             info._sifields._sigfault._addr = env->pc;
  64             queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info);
  65             break;
  66         case EXCP_CHK:
  67             info.si_signo = TARGET_SIGFPE;
  68             info.si_errno = 0;
  69             info.si_code = TARGET_FPE_INTOVF;
  70             info._sifields._sigfault._addr = env->pc;
  71             queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info);
  72             break;
  73         case EXCP_DIV0:
  74             info.si_signo = TARGET_SIGFPE;
  75             info.si_errno = 0;
  76             info.si_code = TARGET_FPE_INTDIV;
  77             info._sifields._sigfault._addr = env->pc;
  78             queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info);
  79             break;
  80         case EXCP_TRAP0:
  81             {
  82                 abi_long ret;
  83                 ts->sim_syscalls = 0;
  84                 n = env->dregs[0];
  85                 env->pc += 2;
  86                 ret = do_syscall(env,
  87                                  n,
  88                                  env->dregs[1],
  89                                  env->dregs[2],
  90                                  env->dregs[3],
  91                                  env->dregs[4],
  92                                  env->dregs[5],
  93                                  env->aregs[0],
  94                                  0, 0);
  95                 if (ret == -TARGET_ERESTARTSYS) {
  96                     env->pc -= 2;
  97                 } else if (ret != -TARGET_QEMU_ESIGRETURN) {
  98                     env->dregs[0] = ret;
  99                 }
 100             }
 101             break;
 102         case EXCP_INTERRUPT:
 103             /* just indicate that signals should be handled asap */
 104             break;
 105         case EXCP_ACCESS:
 106             {
 107                 info.si_signo = TARGET_SIGSEGV;
 108                 info.si_errno = 0;
 109                 /* XXX: check env->error_code */
 110                 info.si_code = TARGET_SEGV_MAPERR;
 111                 info._sifields._sigfault._addr = env->mmu.ar;
 112                 queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info);
 113             }
 114             break;
 115         case EXCP_DEBUG:
 116             info.si_signo = TARGET_SIGTRAP;
 117             info.si_errno = 0;
 118             info.si_code = TARGET_TRAP_BRKPT;
 119             queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info);
 120             break;
 121         case EXCP_ATOMIC:
 122             cpu_exec_step_atomic(cs);
 123             break;
 124         default:
 125             EXCP_DUMP(env, "qemu: unhandled CPU exception 0x%x - aborting\n", trapnr);
 126             abort();
 127         }
 128         process_pending_signals(env);
 129     }
 130 }
 131
 132 void target_cpu_copy_regs(CPUArchState *env, struct target_pt_regs *regs)
 133 {
 134     CPUState *cpu = env_cpu(env);
 135     TaskState *ts = cpu->opaque;
 136     struct image_info *info = ts->info;
 137
 138     env->pc = regs->pc;
 139     env->dregs[0] = regs->d0;
 140     env->dregs[1] = regs->d1;
 141     env->dregs[2] = regs->d2;
 142     env->dregs[3] = regs->d3;
 143     env->dregs[4] = regs->d4;
 144     env->dregs[5] = regs->d5;
 145     env->dregs[6] = regs->d6;
 146     env->dregs[7] = regs->d7;
 147     env->aregs[0] = regs->a0;
 148     env->aregs[1] = regs->a1;
 149     env->aregs[2] = regs->a2;
 150     env->aregs[3] = regs->a3;
 151     env->aregs[4] = regs->a4;
 152     env->aregs[5] = regs->a5;
 153     env->aregs[6] = regs->a6;
 154     env->aregs[7] = regs->usp;
 155     env->sr = regs->sr;
 156
 157     ts->sim_syscalls = 1;
 158     ts->stack_base = info->start_stack;
 159     ts->heap_base = info->brk;
 160     /* This will be filled in on the first SYS_HEAPINFO call.  */
 161     ts->heap_limit = 0;
 162 }