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-common.h"
  22 #include "qemu.h"
  23 #include "user-internals.h"
  24 #include "cpu_loop-common.h"
  25 #include "signal-common.h"
  26
  27
  28 static int get_pgm_data_si_code(int dxc_code)
  29 {
  30     switch (dxc_code) {
  31     /* Non-simulated IEEE exceptions */
  32     case 0x80:
  33         return TARGET_FPE_FLTINV;
  34     case 0x40:
  35         return TARGET_FPE_FLTDIV;
  36     case 0x20:
  37     case 0x28:
  38     case 0x2c:
  39         return TARGET_FPE_FLTOVF;
  40     case 0x10:
  41     case 0x18:
  42     case 0x1c:
  43         return TARGET_FPE_FLTUND;
  44     case 0x08:
  45     case 0x0c:
  46         return TARGET_FPE_FLTRES;
  47     }
  48     /*
  49      * Non-IEEE and simulated IEEE:
  50      * Includes compare-and-trap, quantum exception, etc.
  51      * Simulated IEEE are included here to match current
  52      * s390x linux kernel.
  53      */
  54     return 0;
  55 }
  56
  57 void cpu_loop(CPUS390XState *env)
  58 {
  59     CPUState *cs = env_cpu(env);
  60     int trapnr, n, sig;
  61     target_ulong addr;
  62     abi_long ret;
  63
  64     while (1) {
  65         cpu_exec_start(cs);
  66         trapnr = cpu_exec(cs);
  67         cpu_exec_end(cs);
  68         process_queued_cpu_work(cs);
  69
  70         switch (trapnr) {
  71         case EXCP_INTERRUPT:
  72             /* Just indicate that signals should be handled asap.  */
  73             break;
  74
  75         case EXCP_SVC:
  76             n = env->int_svc_code;
  77             if (!n) {
  78                 /* syscalls > 255 */
  79                 n = env->regs[1];
  80             }
  81             env->psw.addr += env->int_svc_ilen;
  82             ret = do_syscall(env, n, env->regs[2], env->regs[3],
  83                              env->regs[4], env->regs[5],
  84                              env->regs[6], env->regs[7], 0, 0);
  85             if (ret == -QEMU_ERESTARTSYS) {
  86                 env->psw.addr -= env->int_svc_ilen;
  87             } else if (ret != -QEMU_ESIGRETURN) {
  88                 env->regs[2] = ret;
  89             }
  90             break;
  91
  92         case EXCP_DEBUG:
  93             sig = TARGET_SIGTRAP;
  94             n = TARGET_TRAP_BRKPT;
  95             /*
  96              * For SIGTRAP the PSW must point after the instruction, which it
  97              * already does thanks to s390x_tr_tb_stop(). si_addr doesn't need
  98              * to be filled.
  99              */
 100             addr = 0;
 101             goto do_signal;
 102         case EXCP_PGM:
 103             n = env->int_pgm_code;
 104             switch (n) {
 105             case PGM_OPERATION:
 106             case PGM_PRIVILEGED:
 107                 sig = TARGET_SIGILL;
 108                 n = TARGET_ILL_ILLOPC;
 109                 goto do_signal_pc;
 110             case PGM_PROTECTION:
 111                 force_sig_fault(TARGET_SIGSEGV, TARGET_SEGV_ACCERR,
 112                                 env->__excp_addr);
 113                 break;
 114             case PGM_ADDRESSING:
 115                 force_sig_fault(TARGET_SIGSEGV, TARGET_SEGV_MAPERR,
 116                                 env->__excp_addr);
 117                 break;
 118             case PGM_EXECUTE:
 119             case PGM_SPECIFICATION:
 120             case PGM_SPECIAL_OP:
 121             case PGM_OPERAND:
 122             do_sigill_opn:
 123                 sig = TARGET_SIGILL;
 124                 n = TARGET_ILL_ILLOPN;
 125                 goto do_signal_pc;
 126
 127             case PGM_FIXPT_OVERFLOW:
 128                 sig = TARGET_SIGFPE;
 129                 n = TARGET_FPE_INTOVF;
 130                 goto do_signal_pc;
 131             case PGM_FIXPT_DIVIDE:
 132                 sig = TARGET_SIGFPE;
 133                 n = TARGET_FPE_INTDIV;
 134                 goto do_signal_pc;
 135
 136             case PGM_DATA:
 137                 n = (env->fpc >> 8) & 0xff;
 138                 if (n == 0) {
 139                     goto do_sigill_opn;
 140                 }
 141
 142                 sig = TARGET_SIGFPE;
 143                 n = get_pgm_data_si_code(n);
 144                 goto do_signal_pc;
 145
 146             default:
 147                 fprintf(stderr, "Unhandled program exception: %#x\n", n);
 148                 cpu_dump_state(cs, stderr, 0);
 149                 exit(EXIT_FAILURE);
 150             }
 151             break;
 152
 153         do_signal_pc:
 154             addr = env->psw.addr;
 155             /*
 156              * For SIGILL and SIGFPE the PSW must point after the instruction.
 157              */
 158             env->psw.addr += env->int_pgm_ilen;
 159         do_signal:
 160             force_sig_fault(sig, n, addr);
 161             break;
 162
 163         case EXCP_ATOMIC:
 164             cpu_exec_step_atomic(cs);
 165             break;
 166         default:
 167             fprintf(stderr, "Unhandled trap: 0x%x\n", trapnr);
 168             cpu_dump_state(cs, stderr, 0);
 169             exit(EXIT_FAILURE);
 170         }
 171         process_pending_signals (env);
 172     }
 173 }
 174
 175 void target_cpu_copy_regs(CPUArchState *env, struct target_pt_regs *regs)
 176 {
 177     int i;
 178     for (i = 0; i < 16; i++) {
 179         env->regs[i] = regs->gprs[i];
 180     }
 181     env->psw.mask = regs->psw.mask;
 182     env->psw.addr = regs->psw.addr;
 183 }