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 "cpu_loop-common.h"
  24 #include "signal-common.h"
  25
  26 /* s390x masks the fault address it reports in si_addr for SIGSEGV and SIGBUS */
  27 #define S390X_FAIL_ADDR_MASK -4096LL
  28
  29 static int get_pgm_data_si_code(int dxc_code)
  30 {
  31     switch (dxc_code) {
  32     /* Non-simulated IEEE exceptions */
  33     case 0x80:
  34         return TARGET_FPE_FLTINV;
  35     case 0x40:
  36         return TARGET_FPE_FLTDIV;
  37     case 0x20:
  38     case 0x28:
  39     case 0x2c:
  40         return TARGET_FPE_FLTOVF;
  41     case 0x10:
  42     case 0x18:
  43     case 0x1c:
  44         return TARGET_FPE_FLTUND;
  45     case 0x08:
  46     case 0x0c:
  47         return TARGET_FPE_FLTRES;
  48     }
  49     /*
  50      * Non-IEEE and simulated IEEE:
  51      * Includes compare-and-trap, quantum exception, etc.
  52      * Simulated IEEE are included here to match current
  53      * s390x linux kernel.
  54      */
  55     return 0;
  56 }
  57
  58 void cpu_loop(CPUS390XState *env)
  59 {
  60     CPUState *cs = env_cpu(env);
  61     int trapnr, n, sig;
  62     target_siginfo_t info;
  63     target_ulong addr;
  64     abi_long ret;
  65
  66     while (1) {
  67         cpu_exec_start(cs);
  68         trapnr = cpu_exec(cs);
  69         cpu_exec_end(cs);
  70         process_queued_cpu_work(cs);
  71
  72         switch (trapnr) {
  73         case EXCP_INTERRUPT:
  74             /* Just indicate that signals should be handled asap.  */
  75             break;
  76
  77         case EXCP_SVC:
  78             n = env->int_svc_code;
  79             if (!n) {
  80                 /* syscalls > 255 */
  81                 n = env->regs[1];
  82             }
  83             env->psw.addr += env->int_svc_ilen;
  84             ret = do_syscall(env, n, env->regs[2], env->regs[3],
  85                              env->regs[4], env->regs[5],
  86                              env->regs[6], env->regs[7], 0, 0);
  87             if (ret == -TARGET_ERESTARTSYS) {
  88                 env->psw.addr -= env->int_svc_ilen;
  89             } else if (ret != -TARGET_QEMU_ESIGRETURN) {
  90                 env->regs[2] = ret;
  91             }
  92             break;
  93
  94         case EXCP_DEBUG:
  95             sig = TARGET_SIGTRAP;
  96             n = TARGET_TRAP_BRKPT;
  97             /*
  98              * For SIGTRAP the PSW must point after the instruction, which it
  99              * already does thanks to s390x_tr_tb_stop(). si_addr doesn't need
 100              * to be filled.
 101              */
 102             addr = 0;
 103             goto do_signal;
 104         case EXCP_PGM:
 105             n = env->int_pgm_code;
 106             switch (n) {
 107             case PGM_OPERATION:
 108             case PGM_PRIVILEGED:
 109                 sig = TARGET_SIGILL;
 110                 n = TARGET_ILL_ILLOPC;
 111                 goto do_signal_pc;
 112             case PGM_PROTECTION:
 113             case PGM_ADDRESSING:
 114                 sig = TARGET_SIGSEGV;
 115                 /* XXX: check env->error_code */
 116                 n = TARGET_SEGV_MAPERR;
 117                 addr = env->__excp_addr & S390X_FAIL_ADDR_MASK;
 118                 goto do_signal;
 119             case PGM_EXECUTE:
 120             case PGM_SPECIFICATION:
 121             case PGM_SPECIAL_OP:
 122             case PGM_OPERAND:
 123             do_sigill_opn:
 124                 sig = TARGET_SIGILL;
 125                 n = TARGET_ILL_ILLOPN;
 126                 goto do_signal_pc;
 127
 128             case PGM_FIXPT_OVERFLOW:
 129                 sig = TARGET_SIGFPE;
 130                 n = TARGET_FPE_INTOVF;
 131                 goto do_signal_pc;
 132             case PGM_FIXPT_DIVIDE:
 133                 sig = TARGET_SIGFPE;
 134                 n = TARGET_FPE_INTDIV;
 135                 goto do_signal_pc;
 136
 137             case PGM_DATA:
 138                 n = (env->fpc >> 8) & 0xff;
 139                 if (n == 0) {
 140                     goto do_sigill_opn;
 141                 }
 142
 143                 sig = TARGET_SIGFPE;
 144                 n = get_pgm_data_si_code(n);
 145                 goto do_signal_pc;
 146
 147             default:
 148                 fprintf(stderr, "Unhandled program exception: %#x\n", n);
 149                 cpu_dump_state(cs, stderr, 0);
 150                 exit(EXIT_FAILURE);
 151             }
 152             break;
 153
 154         do_signal_pc:
 155             addr = env->psw.addr;
 156             /*
 157              * For SIGILL and SIGFPE the PSW must point after the instruction.
 158              */
 159             env->psw.addr += env->int_pgm_ilen;
 160         do_signal:
 161             info.si_signo = sig;
 162             info.si_errno = 0;
 163             info.si_code = n;
 164             info._sifields._sigfault._addr = addr;
 165             queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info);
 166             break;
 167
 168         case EXCP_ATOMIC:
 169             cpu_exec_step_atomic(cs);
 170             break;
 171         default:
 172             fprintf(stderr, "Unhandled trap: 0x%x\n", trapnr);
 173             cpu_dump_state(cs, stderr, 0);
 174             exit(EXIT_FAILURE);
 175         }
 176         process_pending_signals (env);
 177     }
 178 }
 179
 180 void target_cpu_copy_regs(CPUArchState *env, struct target_pt_regs *regs)
 181 {
 182     int i;
 183     for (i = 0; i < 16; i++) {
 184         env->regs[i] = regs->gprs[i];
 185     }
 186     env->psw.mask = regs->psw.mask;
 187     env->psw.addr = regs->psw.addr;
 188 }