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
  90             if (unlikely(cs->singlestep_enabled)) {
  91                 /*
  92                  * cpu_tb_exec() did not raise EXCP_DEBUG, because it has seen
  93                  * that EXCP_SVC was already pending.
  94                  */
  95                 cs->exception_index = EXCP_DEBUG;
  96             }
  97
  98             break;
  99
 100         case EXCP_DEBUG:
 101             sig = TARGET_SIGTRAP;
 102             n = TARGET_TRAP_BRKPT;
 103             /*
 104              * For SIGTRAP the PSW must point after the instruction, which it
 105              * already does thanks to s390x_tr_tb_stop(). si_addr doesn't need
 106              * to be filled.
 107              */
 108             addr = 0;
 109             goto do_signal;
 110         case EXCP_PGM:
 111             n = env->int_pgm_code;
 112             switch (n) {
 113             case PGM_OPERATION:
 114             case PGM_PRIVILEGED:
 115                 sig = TARGET_SIGILL;
 116                 n = TARGET_ILL_ILLOPC;
 117                 goto do_signal_pc;
 118             case PGM_PROTECTION:
 119                 force_sig_fault(TARGET_SIGSEGV, TARGET_SEGV_ACCERR,
 120                                 env->__excp_addr);
 121                 break;
 122             case PGM_ADDRESSING:
 123                 force_sig_fault(TARGET_SIGSEGV, TARGET_SEGV_MAPERR,
 124                                 env->__excp_addr);
 125                 break;
 126             case PGM_EXECUTE:
 127             case PGM_SPECIFICATION:
 128             case PGM_SPECIAL_OP:
 129             case PGM_OPERAND:
 130             do_sigill_opn:
 131                 sig = TARGET_SIGILL;
 132                 n = TARGET_ILL_ILLOPN;
 133                 goto do_signal_pc;
 134
 135             case PGM_FIXPT_OVERFLOW:
 136                 sig = TARGET_SIGFPE;
 137                 n = TARGET_FPE_INTOVF;
 138                 goto do_signal_pc;
 139             case PGM_FIXPT_DIVIDE:
 140                 sig = TARGET_SIGFPE;
 141                 n = TARGET_FPE_INTDIV;
 142                 goto do_signal_pc;
 143
 144             case PGM_DATA:
 145                 n = (env->fpc >> 8) & 0xff;
 146                 if (n == 0) {
 147                     goto do_sigill_opn;
 148                 }
 149
 150                 sig = TARGET_SIGFPE;
 151                 n = get_pgm_data_si_code(n);
 152                 goto do_signal_pc;
 153
 154             default:
 155                 fprintf(stderr, "Unhandled program exception: %#x\n", n);
 156                 cpu_dump_state(cs, stderr, 0);
 157                 exit(EXIT_FAILURE);
 158             }
 159             break;
 160
 161         do_signal_pc:
 162             addr = env->psw.addr;
 163             /*
 164              * For SIGILL and SIGFPE the PSW must point after the instruction.
 165              */
 166             env->psw.addr += env->int_pgm_ilen;
 167         do_signal:
 168             force_sig_fault(sig, n, addr);
 169             break;
 170
 171         case EXCP_ATOMIC:
 172             cpu_exec_step_atomic(cs);
 173             break;
 174         default:
 175             fprintf(stderr, "Unhandled trap: 0x%x\n", trapnr);
 176             cpu_dump_state(cs, stderr, 0);
 177             exit(EXIT_FAILURE);
 178         }
 179         process_pending_signals (env);
 180     }
 181 }
 182
 183 void target_cpu_copy_regs(CPUArchState *env, struct target_pt_regs *regs)
 184 {
 185     int i;
 186     for (i = 0; i < 16; i++) {
 187         env->regs[i] = regs->gprs[i];
 188     }
 189     env->psw.mask = regs->psw.mask;
 190     env->psw.addr = regs->psw.addr;
 191 }