linux-user/hppa/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 "user-internals.h"
  23 #include "cpu_loop-common.h"
  24 #include "signal-common.h"
  25
  26 static abi_ulong hppa_lws(CPUHPPAState *env)
  27 {
  28     CPUState *cs = env_cpu(env);
  29     uint32_t which = env->gr[20];
  30     abi_ulong addr = env->gr[26];
  31     abi_ulong old = env->gr[25];
  32     abi_ulong new = env->gr[24];
  33     abi_ulong size, ret;
  34
  35     switch (which) {
  36     default:
  37         return -TARGET_ENOSYS;
  38
  39     case 0: /* elf32 atomic 32bit cmpxchg */
  40         if ((addr & 3) || !access_ok(cs, VERIFY_WRITE, addr, 4)) {
  41             return -TARGET_EFAULT;
  42         }
  43         old = tswap32(old);
  44         new = tswap32(new);
  45         ret = qatomic_cmpxchg((uint32_t *)g2h(cs, addr), old, new);
  46         ret = tswap32(ret);
  47         break;
  48
  49     case 2: /* elf32 atomic "new" cmpxchg */
  50         size = env->gr[23];
  51         if (size >= 4) {
  52             return -TARGET_ENOSYS;
  53         }
  54         if (((addr | old | new) & ((1 << size) - 1))
  55             || !access_ok(cs, VERIFY_WRITE, addr, 1 << size)
  56             || !access_ok(cs, VERIFY_READ, old, 1 << size)
  57             || !access_ok(cs, VERIFY_READ, new, 1 << size)) {
  58             return -TARGET_EFAULT;
  59         }
  60         /* Note that below we use host-endian loads so that the cmpxchg
  61            can be host-endian as well.  */
  62         switch (size) {
  63         case 0:
  64             old = *(uint8_t *)g2h(cs, old);
  65             new = *(uint8_t *)g2h(cs, new);
  66             ret = qatomic_cmpxchg((uint8_t *)g2h(cs, addr), old, new);
  67             ret = ret != old;
  68             break;
  69         case 1:
  70             old = *(uint16_t *)g2h(cs, old);
  71             new = *(uint16_t *)g2h(cs, new);
  72             ret = qatomic_cmpxchg((uint16_t *)g2h(cs, addr), old, new);
  73             ret = ret != old;
  74             break;
  75         case 2:
  76             old = *(uint32_t *)g2h(cs, old);
  77             new = *(uint32_t *)g2h(cs, new);
  78             ret = qatomic_cmpxchg((uint32_t *)g2h(cs, addr), old, new);
  79             ret = ret != old;
  80             break;
  81         case 3:
  82             {
  83                 uint64_t o64, n64, r64;
  84                 o64 = *(uint64_t *)g2h(cs, old);
  85                 n64 = *(uint64_t *)g2h(cs, new);
  86 #ifdef CONFIG_ATOMIC64
  87                 r64 = qatomic_cmpxchg__nocheck((aligned_uint64_t *)g2h(cs, addr),
  88                                                o64, n64);
  89                 ret = r64 != o64;
  90 #else
  91                 start_exclusive();
  92                 r64 = *(uint64_t *)g2h(cs, addr);
  93                 ret = 1;
  94                 if (r64 == o64) {
  95                     *(uint64_t *)g2h(cs, addr) = n64;
  96                     ret = 0;
  97                 }
  98                 end_exclusive();
  99 #endif
 100             }
 101             break;
 102         }
 103         break;
 104     }
 105
 106     env->gr[28] = ret;
 107     return 0;
 108 }
 109
 110 void cpu_loop(CPUHPPAState *env)
 111 {
 112     CPUState *cs = env_cpu(env);
 113     target_siginfo_t info;
 114     abi_ulong ret;
 115     int trapnr;
 116
 117     while (1) {
 118         cpu_exec_start(cs);
 119         trapnr = cpu_exec(cs);
 120         cpu_exec_end(cs);
 121         process_queued_cpu_work(cs);
 122
 123         switch (trapnr) {
 124         case EXCP_SYSCALL:
 125             ret = do_syscall(env, env->gr[20],
 126                              env->gr[26], env->gr[25],
 127                              env->gr[24], env->gr[23],
 128                              env->gr[22], env->gr[21], 0, 0);
 129             switch (ret) {
 130             default:
 131                 env->gr[28] = ret;
 132                 /* We arrived here by faking the gateway page.  Return.  */
 133                 env->iaoq_f = env->gr[31];
 134                 env->iaoq_b = env->gr[31] + 4;
 135                 break;
 136             case -QEMU_ERESTARTSYS:
 137             case -QEMU_ESIGRETURN:
 138                 break;
 139             }
 140             break;
 141         case EXCP_SYSCALL_LWS:
 142             env->gr[21] = hppa_lws(env);
 143             /* We arrived here by faking the gateway page.  Return.  */
 144             env->iaoq_f = env->gr[31];
 145             env->iaoq_b = env->gr[31] + 4;
 146             break;
 147         case EXCP_ILL:
 148         case EXCP_PRIV_OPR:
 149         case EXCP_PRIV_REG:
 150             info.si_signo = TARGET_SIGILL;
 151             info.si_errno = 0;
 152             info.si_code = TARGET_ILL_ILLOPN;
 153             info._sifields._sigfault._addr = env->iaoq_f;
 154             queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info);
 155             break;
 156         case EXCP_OVERFLOW:
 157         case EXCP_COND:
 158         case EXCP_ASSIST:
 159             info.si_signo = TARGET_SIGFPE;
 160             info.si_errno = 0;
 161             info.si_code = 0;
 162             info._sifields._sigfault._addr = env->iaoq_f;
 163             queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info);
 164             break;
 165         case EXCP_DEBUG:
 166             info.si_signo = TARGET_SIGTRAP;
 167             info.si_errno = 0;
 168             info.si_code = TARGET_TRAP_BRKPT;
 169             queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info);
 170             break;
 171         case EXCP_INTERRUPT:
 172             /* just indicate that signals should be handled asap */
 173             break;
 174         default:
 175             g_assert_not_reached();
 176         }
 177         process_pending_signals(env);
 178     }
 179 }
 180
 181 void target_cpu_copy_regs(CPUArchState *env, struct target_pt_regs *regs)
 182 {
 183     int i;
 184     for (i = 1; i < 32; i++) {
 185         env->gr[i] = regs->gr[i];
 186     }
 187     env->iaoq_f = regs->iaoq[0];
 188     env->iaoq_b = regs->iaoq[1];
 189 }