LXR qemu/linux-user/openrisc/cpu

   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
  27void 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_ALIGN:
  58            info.si_signo = TARGET_SIGBUS;
  59            info.si_errno = 0;
  60            info.si_code = TARGET_BUS_ADRALN;
  61            info._sifields._sigfault._addr = env->pc;
  62            queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info);
  63            break;
  64        case EXCP_ILLEGAL:
  65            info.si_signo = TARGET_SIGILL;
  66            info.si_errno = 0;
  67            info.si_code = TARGET_ILL_ILLOPC;
  68            info._sifields._sigfault._addr = env->pc;
  69            queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info);
  70            break;
  71        case EXCP_INTERRUPT:
  72            /* We processed the pending cpu work above.  */
  73            break;
  74        case EXCP_DEBUG:
  75            info.si_signo = TARGET_SIGTRAP;
  76            info.si_errno = 0;
  77            info.si_code = TARGET_TRAP_BRKPT;
  78            queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info);
  79            break;
  80        case EXCP_ATOMIC:
  81            cpu_exec_step_atomic(cs);
  82            break;
  83        case EXCP_RANGE:
  84            /* Requires SR.OVE set, which linux-user won't do. */
  85            cpu_abort(cs, "Unexpected RANGE exception");
  86        case EXCP_FPE:
  87            /*
  88             * Requires FPSCR.FPEE set.  Writes to FPSCR from usermode not
  89             * yet enabled in kernel ABI, so linux-user does not either.
  90             */
  91            cpu_abort(cs, "Unexpected FPE exception");
  92        default:
  93            g_assert_not_reached();
  94        }
  95        process_pending_signals(env);
  96    }
  97}
  98
  99void target_cpu_copy_regs(CPUArchState *env, struct target_pt_regs *regs)
 100{
 101    int i;
 102
 103    for (i = 0; i < 32; i++) {
 104        cpu_set_gpr(env, i, regs->gpr[i]);
 105    }
 106    env->pc = regs->pc;
 107    cpu_set_sr(env, regs->sr);
 108}
 109