qemu

FORK: QEMU emulator
git clone https://git.neptards.moe/neptards/qemu.git
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cpu_loop.c (2946B)

      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(CPUCRISState *env)
     27 {
     28     CPUState *cs = env_cpu(env);
     29     int trapnr, ret;
     30 
     31     while (1) {
     32         cpu_exec_start(cs);
     33         trapnr = cpu_exec(cs);
     34         cpu_exec_end(cs);
     35         process_queued_cpu_work(cs);
     36 
     37         switch (trapnr) {
     38         case EXCP_INTERRUPT:
     39             /* just indicate that signals should be handled asap */
     40             break;
     41         case EXCP_BREAK:
     42             ret = do_syscall(env, 
     43                              env->regs[9], 
     44                              env->regs[10], 
     45                              env->regs[11], 
     46                              env->regs[12], 
     47                              env->regs[13], 
     48                              env->pregs[7], 
     49                              env->pregs[11],
     50                              0, 0);
     51             if (ret == -QEMU_ERESTARTSYS) {
     52                 env->pc -= 2;
     53             } else if (ret != -QEMU_ESIGRETURN) {
     54                 env->regs[10] = ret;
     55             }
     56             break;
     57         case EXCP_DEBUG:
     58             force_sig_fault(TARGET_SIGTRAP, TARGET_TRAP_BRKPT, env->pc);
     59             break;
     60         case EXCP_ATOMIC:
     61             cpu_exec_step_atomic(cs);
     62             break;
     63         default:
     64             fprintf(stderr, "Unhandled trap: 0x%x\n", trapnr);
     65             cpu_dump_state(cs, stderr, 0);
     66             exit(EXIT_FAILURE);
     67         }
     68         process_pending_signals (env);
     69     }
     70 }
     71 
     72 void target_cpu_copy_regs(CPUArchState *env, struct target_pt_regs *regs)
     73 {
     74     CPUState *cpu = env_cpu(env);
     75     TaskState *ts = cpu->opaque;
     76     struct image_info *info = ts->info;
     77 
     78     env->regs[0] = regs->r0;
     79     env->regs[1] = regs->r1;
     80     env->regs[2] = regs->r2;
     81     env->regs[3] = regs->r3;
     82     env->regs[4] = regs->r4;
     83     env->regs[5] = regs->r5;
     84     env->regs[6] = regs->r6;
     85     env->regs[7] = regs->r7;
     86     env->regs[8] = regs->r8;
     87     env->regs[9] = regs->r9;
     88     env->regs[10] = regs->r10;
     89     env->regs[11] = regs->r11;
     90     env->regs[12] = regs->r12;
     91     env->regs[13] = regs->r13;
     92     env->regs[14] = info->start_stack;
     93     env->regs[15] = regs->acr;
     94     env->pc = regs->erp;
     95 }