linux-user/openrisc/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.h"
  22 #include "cpu_loop-common.h"
  23
  24 void cpu_loop(CPUOpenRISCState *env)
  25 {
  26     CPUState *cs = CPU(openrisc_env_get_cpu(env));
  27     int trapnr;
  28     abi_long ret;
  29     target_siginfo_t info;
  30
  31     for (;;) {
  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_SYSCALL:
  39             env->pc += 4;   /* 0xc00; */
  40             ret = do_syscall(env,
  41                              cpu_get_gpr(env, 11), /* return value       */
  42                              cpu_get_gpr(env, 3),  /* r3 - r7 are params */
  43                              cpu_get_gpr(env, 4),
  44                              cpu_get_gpr(env, 5),
  45                              cpu_get_gpr(env, 6),
  46                              cpu_get_gpr(env, 7),
  47                              cpu_get_gpr(env, 8), 0, 0);
  48             if (ret == -TARGET_ERESTARTSYS) {
  49                 env->pc -= 4;
  50             } else if (ret != -TARGET_QEMU_ESIGRETURN) {
  51                 cpu_set_gpr(env, 11, ret);
  52             }
  53             break;
  54         case EXCP_DPF:
  55         case EXCP_IPF:
  56         case EXCP_RANGE:
  57             info.si_signo = TARGET_SIGSEGV;
  58             info.si_errno = 0;
  59             info.si_code = TARGET_SEGV_MAPERR;
  60             info._sifields._sigfault._addr = env->pc;
  61             queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info);
  62             break;
  63         case EXCP_ALIGN:
  64             info.si_signo = TARGET_SIGBUS;
  65             info.si_errno = 0;
  66             info.si_code = TARGET_BUS_ADRALN;
  67             info._sifields._sigfault._addr = env->pc;
  68             queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info);
  69             break;
  70         case EXCP_ILLEGAL:
  71             info.si_signo = TARGET_SIGILL;
  72             info.si_errno = 0;
  73             info.si_code = TARGET_ILL_ILLOPC;
  74             info._sifields._sigfault._addr = env->pc;
  75             queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info);
  76             break;
  77         case EXCP_FPE:
  78             info.si_signo = TARGET_SIGFPE;
  79             info.si_errno = 0;
  80             info.si_code = 0;
  81             info._sifields._sigfault._addr = env->pc;
  82             queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info);
  83             break;
  84         case EXCP_INTERRUPT:
  85             /* We processed the pending cpu work above.  */
  86             break;
  87         case EXCP_DEBUG:
  88             trapnr = gdb_handlesig(cs, TARGET_SIGTRAP);
  89             if (trapnr) {
  90                 info.si_signo = trapnr;
  91                 info.si_errno = 0;
  92                 info.si_code = TARGET_TRAP_BRKPT;
  93                 queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info);
  94             }
  95             break;
  96         case EXCP_ATOMIC:
  97             cpu_exec_step_atomic(cs);
  98             break;
  99         default:
 100             g_assert_not_reached();
 101         }
 102         process_pending_signals(env);
 103     }
 104 }
 105
 106 void target_cpu_copy_regs(CPUArchState *env, struct target_pt_regs *regs)
 107 {
 108     int i;
 109
 110     for (i = 0; i < 32; i++) {
 111         cpu_set_gpr(env, i, regs->gpr[i]);
 112     }
 113     env->pc = regs->pc;
 114     cpu_set_sr(env, regs->sr);
 115 }