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
  25 /* s390x masks the fault address it reports in si_addr for SIGSEGV and SIGBUS */
  26 #define S390X_FAIL_ADDR_MASK -4096LL
  27
  28 void cpu_loop(CPUS390XState *env)
  29 {
  30     CPUState *cs = env_cpu(env);
  31     int trapnr, n, sig;
  32     target_siginfo_t info;
  33     target_ulong addr;
  34     abi_long ret;
  35
  36     while (1) {
  37         cpu_exec_start(cs);
  38         trapnr = cpu_exec(cs);
  39         cpu_exec_end(cs);
  40         process_queued_cpu_work(cs);
  41
  42         switch (trapnr) {
  43         case EXCP_INTERRUPT:
  44             /* Just indicate that signals should be handled asap.  */
  45             break;
  46
  47         case EXCP_SVC:
  48             n = env->int_svc_code;
  49             if (!n) {
  50                 /* syscalls > 255 */
  51                 n = env->regs[1];
  52             }
  53             env->psw.addr += env->int_svc_ilen;
  54             ret = do_syscall(env, n, env->regs[2], env->regs[3],
  55                              env->regs[4], env->regs[5],
  56                              env->regs[6], env->regs[7], 0, 0);
  57             if (ret == -TARGET_ERESTARTSYS) {
  58                 env->psw.addr -= env->int_svc_ilen;
  59             } else if (ret != -TARGET_QEMU_ESIGRETURN) {
  60                 env->regs[2] = ret;
  61             }
  62             break;
  63
  64         case EXCP_DEBUG:
  65             sig = TARGET_SIGTRAP;
  66             n = TARGET_TRAP_BRKPT;
  67             goto do_signal_pc;
  68         case EXCP_PGM:
  69             n = env->int_pgm_code;
  70             switch (n) {
  71             case PGM_OPERATION:
  72             case PGM_PRIVILEGED:
  73                 sig = TARGET_SIGILL;
  74                 n = TARGET_ILL_ILLOPC;
  75                 goto do_signal_pc;
  76             case PGM_PROTECTION:
  77             case PGM_ADDRESSING:
  78                 sig = TARGET_SIGSEGV;
  79                 /* XXX: check env->error_code */
  80                 n = TARGET_SEGV_MAPERR;
  81                 addr = env->__excp_addr & S390X_FAIL_ADDR_MASK;
  82                 goto do_signal;
  83             case PGM_EXECUTE:
  84             case PGM_SPECIFICATION:
  85             case PGM_SPECIAL_OP:
  86             case PGM_OPERAND:
  87             do_sigill_opn:
  88                 sig = TARGET_SIGILL;
  89                 n = TARGET_ILL_ILLOPN;
  90                 goto do_signal_pc;
  91
  92             case PGM_FIXPT_OVERFLOW:
  93                 sig = TARGET_SIGFPE;
  94                 n = TARGET_FPE_INTOVF;
  95                 goto do_signal_pc;
  96             case PGM_FIXPT_DIVIDE:
  97                 sig = TARGET_SIGFPE;
  98                 n = TARGET_FPE_INTDIV;
  99                 goto do_signal_pc;
 100
 101             case PGM_DATA:
 102                 n = (env->fpc >> 8) & 0xff;
 103                 if (n == 0xff) {
 104                     /* compare-and-trap */
 105                     goto do_sigill_opn;
 106                 } else {
 107                     /* An IEEE exception, simulated or otherwise.  */
 108                     if (n & 0x80) {
 109                         n = TARGET_FPE_FLTINV;
 110                     } else if (n & 0x40) {
 111                         n = TARGET_FPE_FLTDIV;
 112                     } else if (n & 0x20) {
 113                         n = TARGET_FPE_FLTOVF;
 114                     } else if (n & 0x10) {
 115                         n = TARGET_FPE_FLTUND;
 116                     } else if (n & 0x08) {
 117                         n = TARGET_FPE_FLTRES;
 118                     } else {
 119                         /* ??? Quantum exception; BFP, DFP error.  */
 120                         goto do_sigill_opn;
 121                     }
 122                     sig = TARGET_SIGFPE;
 123                     goto do_signal_pc;
 124                 }
 125
 126             default:
 127                 fprintf(stderr, "Unhandled program exception: %#x\n", n);
 128                 cpu_dump_state(cs, stderr, 0);
 129                 exit(EXIT_FAILURE);
 130             }
 131             break;
 132
 133         do_signal_pc:
 134             addr = env->psw.addr;
 135         do_signal:
 136             info.si_signo = sig;
 137             info.si_errno = 0;
 138             info.si_code = n;
 139             info._sifields._sigfault._addr = addr;
 140             queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info);
 141             break;
 142
 143         case EXCP_ATOMIC:
 144             cpu_exec_step_atomic(cs);
 145             break;
 146         default:
 147             fprintf(stderr, "Unhandled trap: 0x%x\n", trapnr);
 148             cpu_dump_state(cs, stderr, 0);
 149             exit(EXIT_FAILURE);
 150         }
 151         process_pending_signals (env);
 152     }
 153 }
 154
 155 void target_cpu_copy_regs(CPUArchState *env, struct target_pt_regs *regs)
 156 {
 157     int i;
 158     for (i = 0; i < 16; i++) {
 159         env->regs[i] = regs->gprs[i];
 160     }
 161     env->psw.mask = regs->psw.mask;
 162     env->psw.addr = regs->psw.addr;
 163 }