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 "user-internals.h"
  23 #include "cpu_loop-common.h"
  24 #include "signal-common.h"
  25
  26
  27 static int get_pgm_data_si_code(int dxc_code)
  28 {
  29     switch (dxc_code) {
  30     /* Non-simulated IEEE exceptions */
  31     case 0x80:
  32         return TARGET_FPE_FLTINV;
  33     case 0x40:
  34         return TARGET_FPE_FLTDIV;
  35     case 0x20:
  36     case 0x28:
  37     case 0x2c:
  38         return TARGET_FPE_FLTOVF;
  39     case 0x10:
  40     case 0x18:
  41     case 0x1c:
  42         return TARGET_FPE_FLTUND;
  43     case 0x08:
  44     case 0x0c:
  45         return TARGET_FPE_FLTRES;
  46     }
  47     /*
  48      * Non-IEEE and simulated IEEE:
  49      * Includes compare-and-trap, quantum exception, etc.
  50      * Simulated IEEE are included here to match current
  51      * s390x linux kernel.
  52      */
  53     return 0;
  54 }
  55
  56 void cpu_loop(CPUS390XState *env)
  57 {
  58     CPUState *cs = env_cpu(env);
  59     int trapnr, n, sig;
  60     target_ulong addr;
  61     abi_long ret;
  62
  63     while (1) {
  64         cpu_exec_start(cs);
  65         trapnr = cpu_exec(cs);
  66         cpu_exec_end(cs);
  67         process_queued_cpu_work(cs);
  68
  69         switch (trapnr) {
  70         case EXCP_INTERRUPT:
  71             /* Just indicate that signals should be handled asap.  */
  72             break;
  73
  74         case EXCP_SVC:
  75             n = env->int_svc_code;
  76             if (!n) {
  77                 /* syscalls > 255 */
  78                 n = env->regs[1];
  79             }
  80             env->psw.addr += env->int_svc_ilen;
  81             ret = do_syscall(env, n, env->regs[2], env->regs[3],
  82                              env->regs[4], env->regs[5],
  83                              env->regs[6], env->regs[7], 0, 0);
  84             if (ret == -QEMU_ERESTARTSYS) {
  85                 env->psw.addr -= env->int_svc_ilen;
  86             } else if (ret != -QEMU_ESIGRETURN) {
  87                 env->regs[2] = ret;
  88             }
  89             break;
  90
  91         case EXCP_DEBUG:
  92             sig = TARGET_SIGTRAP;
  93             n = TARGET_TRAP_BRKPT;
  94             /*
  95              * For SIGTRAP the PSW must point after the instruction, which it
  96              * already does thanks to s390x_tr_tb_stop(). si_addr doesn't need
  97              * to be filled.
  98              */
  99             addr = 0;
 100             goto do_signal;
 101         case EXCP_PGM:
 102             n = env->int_pgm_code;
 103             switch (n) {
 104             case PGM_OPERATION:
 105             case PGM_PRIVILEGED:
 106                 sig = TARGET_SIGILL;
 107                 n = TARGET_ILL_ILLOPC;
 108                 goto do_signal_pc;
 109             case PGM_PROTECTION:
 110                 force_sig_fault(TARGET_SIGSEGV, TARGET_SEGV_ACCERR,
 111                                 env->__excp_addr);
 112                 break;
 113             case PGM_ADDRESSING:
 114                 force_sig_fault(TARGET_SIGSEGV, TARGET_SEGV_MAPERR,
 115                                 env->__excp_addr);
 116                 break;
 117             case PGM_EXECUTE:
 118             case PGM_SPECIFICATION:
 119             case PGM_SPECIAL_OP:
 120             case PGM_OPERAND:
 121             do_sigill_opn:
 122                 sig = TARGET_SIGILL;
 123                 n = TARGET_ILL_ILLOPN;
 124                 goto do_signal_pc;
 125
 126             case PGM_FIXPT_OVERFLOW:
 127                 sig = TARGET_SIGFPE;
 128                 n = TARGET_FPE_INTOVF;
 129                 goto do_signal_pc;
 130             case PGM_FIXPT_DIVIDE:
 131                 sig = TARGET_SIGFPE;
 132                 n = TARGET_FPE_INTDIV;
 133                 goto do_signal_pc;
 134
 135             case PGM_DATA:
 136                 n = (env->fpc >> 8) & 0xff;
 137                 if (n == 0) {
 138                     goto do_sigill_opn;
 139                 }
 140
 141                 sig = TARGET_SIGFPE;
 142                 n = get_pgm_data_si_code(n);
 143                 goto do_signal_pc;
 144
 145             default:
 146                 fprintf(stderr, "Unhandled program exception: %#x\n", n);
 147                 cpu_dump_state(cs, stderr, 0);
 148                 exit(EXIT_FAILURE);
 149             }
 150             break;
 151
 152         do_signal_pc:
 153             addr = env->psw.addr;
 154             /*
 155              * For SIGILL and SIGFPE the PSW must point after the instruction.
 156              */
 157             env->psw.addr += env->int_pgm_ilen;
 158         do_signal:
 159             force_sig_fault(sig, n, addr);
 160             break;
 161
 162         case EXCP_ATOMIC:
 163             cpu_exec_step_atomic(cs);
 164             break;
 165         default:
 166             fprintf(stderr, "Unhandled trap: 0x%x\n", trapnr);
 167             cpu_dump_state(cs, stderr, 0);
 168             exit(EXIT_FAILURE);
 169         }
 170         process_pending_signals (env);
 171     }
 172 }
 173
 174 void target_cpu_copy_regs(CPUArchState *env, struct target_pt_regs *regs)
 175 {
 176     int i;
 177     for (i = 0; i < 16; i++) {
 178         env->regs[i] = regs->gprs[i];
 179     }
 180     env->psw.mask = regs->psw.mask;
 181     env->psw.addr = regs->psw.addr;
 182 }