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-common.h"
  22 #include "qemu.h"
  23 #include "user-internals.h"
  24 #include "cpu_loop-common.h"
  25 #include "signal-common.h"
  26
  27 void cpu_loop(CPUOpenRISCState *env)
  28 {
  29     CPUState *cs = env_cpu(env);
  30     int trapnr;
  31     abi_long ret;
  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_SYSCALL:
  42             env->pc += 4;   /* 0xc00; */
  43             ret = do_syscall(env,
  44                              cpu_get_gpr(env, 11), /* return value       */
  45                              cpu_get_gpr(env, 3),  /* r3 - r7 are params */
  46                              cpu_get_gpr(env, 4),
  47                              cpu_get_gpr(env, 5),
  48                              cpu_get_gpr(env, 6),
  49                              cpu_get_gpr(env, 7),
  50                              cpu_get_gpr(env, 8), 0, 0);
  51             if (ret == -TARGET_ERESTARTSYS) {
  52                 env->pc -= 4;
  53             } else if (ret != -TARGET_QEMU_ESIGRETURN) {
  54                 cpu_set_gpr(env, 11, ret);
  55             }
  56             break;
  57         case EXCP_DPF:
  58         case EXCP_IPF:
  59             info.si_signo = TARGET_SIGSEGV;
  60             info.si_errno = 0;
  61             info.si_code = TARGET_SEGV_MAPERR;
  62             info._sifields._sigfault._addr = env->pc;
  63             queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info);
  64             break;
  65         case EXCP_ALIGN:
  66             info.si_signo = TARGET_SIGBUS;
  67             info.si_errno = 0;
  68             info.si_code = TARGET_BUS_ADRALN;
  69             info._sifields._sigfault._addr = env->pc;
  70             queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info);
  71             break;
  72         case EXCP_ILLEGAL:
  73             info.si_signo = TARGET_SIGILL;
  74             info.si_errno = 0;
  75             info.si_code = TARGET_ILL_ILLOPC;
  76             info._sifields._sigfault._addr = env->pc;
  77             queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info);
  78             break;
  79         case EXCP_INTERRUPT:
  80             /* We processed the pending cpu work above.  */
  81             break;
  82         case EXCP_DEBUG:
  83             info.si_signo = TARGET_SIGTRAP;
  84             info.si_errno = 0;
  85             info.si_code = TARGET_TRAP_BRKPT;
  86             queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info);
  87             break;
  88         case EXCP_ATOMIC:
  89             cpu_exec_step_atomic(cs);
  90             break;
  91         case EXCP_RANGE:
  92             /* Requires SR.OVE set, which linux-user won't do. */
  93             cpu_abort(cs, "Unexpected RANGE exception");
  94         case EXCP_FPE:
  95             /*
  96              * Requires FPSCR.FPEE set.  Writes to FPSCR from usermode not
  97              * yet enabled in kernel ABI, so linux-user does not either.
  98              */
  99             cpu_abort(cs, "Unexpected FPE exception");
 100         default:
 101             g_assert_not_reached();
 102         }
 103         process_pending_signals(env);
 104     }
 105 }
 106
 107 void target_cpu_copy_regs(CPUArchState *env, struct target_pt_regs *regs)
 108 {
 109     int i;
 110
 111     for (i = 0; i < 32; i++) {
 112         cpu_set_gpr(env, i, regs->gpr[i]);
 113     }
 114     env->pc = regs->pc;
 115     cpu_set_sr(env, regs->sr);
 116 }