linux-user/s390x/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 /* s390x masks the fault address it reports in si_addr for SIGSEGV and SIGBUS */
  25 #define S390X_FAIL_ADDR_MASK -4096LL
  26
  27 void cpu_loop(CPUS390XState *env)
  28 {
  29     CPUState *cs = CPU(s390_env_get_cpu(env));
  30     int trapnr, n, sig;
  31     target_siginfo_t info;
  32     target_ulong addr;
  33     abi_long ret;
  34
  35     while (1) {
  36         cpu_exec_start(cs);
  37         trapnr = cpu_exec(cs);
  38         cpu_exec_end(cs);
  39         process_queued_cpu_work(cs);
  40
  41         switch (trapnr) {
  42         case EXCP_INTERRUPT:
  43             /* Just indicate that signals should be handled asap.  */
  44             break;
  45
  46         case EXCP_SVC:
  47             n = env->int_svc_code;
  48             if (!n) {
  49                 /* syscalls > 255 */
  50                 n = env->regs[1];
  51             }
  52             env->psw.addr += env->int_svc_ilen;
  53             ret = do_syscall(env, n, env->regs[2], env->regs[3],
  54                              env->regs[4], env->regs[5],
  55                              env->regs[6], env->regs[7], 0, 0);
  56             if (ret == -TARGET_ERESTARTSYS) {
  57                 env->psw.addr -= env->int_svc_ilen;
  58             } else if (ret != -TARGET_QEMU_ESIGRETURN) {
  59                 env->regs[2] = ret;
  60             }
  61             break;
  62
  63         case EXCP_DEBUG:
  64             sig = TARGET_SIGTRAP;
  65             n = TARGET_TRAP_BRKPT;
  66             goto do_signal_pc;
  67         case EXCP_PGM:
  68             n = env->int_pgm_code;
  69             switch (n) {
  70             case PGM_OPERATION:
  71             case PGM_PRIVILEGED:
  72                 sig = TARGET_SIGILL;
  73                 n = TARGET_ILL_ILLOPC;
  74                 goto do_signal_pc;
  75             case PGM_PROTECTION:
  76             case PGM_ADDRESSING:
  77                 sig = TARGET_SIGSEGV;
  78                 /* XXX: check env->error_code */
  79                 n = TARGET_SEGV_MAPERR;
  80                 addr = env->__excp_addr & S390X_FAIL_ADDR_MASK;
  81                 goto do_signal;
  82             case PGM_EXECUTE:
  83             case PGM_SPECIFICATION:
  84             case PGM_SPECIAL_OP:
  85             case PGM_OPERAND:
  86             do_sigill_opn:
  87                 sig = TARGET_SIGILL;
  88                 n = TARGET_ILL_ILLOPN;
  89                 goto do_signal_pc;
  90
  91             case PGM_FIXPT_OVERFLOW:
  92                 sig = TARGET_SIGFPE;
  93                 n = TARGET_FPE_INTOVF;
  94                 goto do_signal_pc;
  95             case PGM_FIXPT_DIVIDE:
  96                 sig = TARGET_SIGFPE;
  97                 n = TARGET_FPE_INTDIV;
  98                 goto do_signal_pc;
  99
 100             case PGM_DATA:
 101                 n = (env->fpc >> 8) & 0xff;
 102                 if (n == 0xff) {
 103                     /* compare-and-trap */
 104                     goto do_sigill_opn;
 105                 } else {
 106                     /* An IEEE exception, simulated or otherwise.  */
 107                     if (n & 0x80) {
 108                         n = TARGET_FPE_FLTINV;
 109                     } else if (n & 0x40) {
 110                         n = TARGET_FPE_FLTDIV;
 111                     } else if (n & 0x20) {
 112                         n = TARGET_FPE_FLTOVF;
 113                     } else if (n & 0x10) {
 114                         n = TARGET_FPE_FLTUND;
 115                     } else if (n & 0x08) {
 116                         n = TARGET_FPE_FLTRES;
 117                     } else {
 118                         /* ??? Quantum exception; BFP, DFP error.  */
 119                         goto do_sigill_opn;
 120                     }
 121                     sig = TARGET_SIGFPE;
 122                     goto do_signal_pc;
 123                 }
 124
 125             default:
 126                 fprintf(stderr, "Unhandled program exception: %#x\n", n);
 127                 cpu_dump_state(cs, stderr, fprintf, 0);
 128                 exit(EXIT_FAILURE);
 129             }
 130             break;
 131
 132         do_signal_pc:
 133             addr = env->psw.addr;
 134         do_signal:
 135             info.si_signo = sig;
 136             info.si_errno = 0;
 137             info.si_code = n;
 138             info._sifields._sigfault._addr = addr;
 139             queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info);
 140             break;
 141
 142         case EXCP_ATOMIC:
 143             cpu_exec_step_atomic(cs);
 144             break;
 145         default:
 146             fprintf(stderr, "Unhandled trap: 0x%x\n", trapnr);
 147             cpu_dump_state(cs, stderr, fprintf, 0);
 148             exit(EXIT_FAILURE);
 149         }
 150         process_pending_signals (env);
 151     }
 152 }
 153
 154 void target_cpu_copy_regs(CPUArchState *env, struct target_pt_regs *regs)
 155 {
 156     int i;
 157     for (i = 0; i < 16; i++) {
 158         env->regs[i] = regs->gprs[i];
 159     }
 160     env->psw.mask = regs->psw.mask;
 161     env->psw.addr = regs->psw.addr;
 162 }