qemu

FORK: QEMU emulator
git clone https://git.neptards.moe/neptards/qemu.git
Log | Files | Refs | Submodules | LICENSE

cpu_loop.c (3957B)

      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 
     26 void 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 
     95 void 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 }