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 "cpu_loop-common.h" 23 24 /* s390x masks the fault address it reports in si_addr for SIGSEGV and SIGBUS */ 25 #define S390X_FAIL_ADDR_MASK -4096LL 26 27 void cpu_loop(CPUS390XState *env) 28 { 29 CPUState *cs = CPU(s390_env_get_cpu(env)); 30 int trapnr, n, sig; 31 target_siginfo_t info; 32 target_ulong addr; 33 abi_long ret; 34 35 while (1) { 36 cpu_exec_start(cs); 37 trapnr = cpu_exec(cs); 38 cpu_exec_end(cs); 39 process_queued_cpu_work(cs); 40 41 switch (trapnr) { 42 case EXCP_INTERRUPT: 43 /* Just indicate that signals should be handled asap. */ 44 break; 45 46 case EXCP_SVC: 47 n = env->int_svc_code; 48 if (!n) { 49 /* syscalls > 255 */ 50 n = env->regs[1]; 51 } 52 env->psw.addr += env->int_svc_ilen; 53 ret = do_syscall(env, n, env->regs[2], env->regs[3], 54 env->regs[4], env->regs[5], 55 env->regs[6], env->regs[7], 0, 0); 56 if (ret == -TARGET_ERESTARTSYS) { 57 env->psw.addr -= env->int_svc_ilen; 58 } else if (ret != -TARGET_QEMU_ESIGRETURN) { 59 env->regs[2] = ret; 60 } 61 break; 62 63 case EXCP_DEBUG: 64 sig = gdb_handlesig(cs, TARGET_SIGTRAP); 65 if (sig) { 66 n = TARGET_TRAP_BRKPT; 67 goto do_signal_pc; 68 } 69 break; 70 case EXCP_PGM: 71 n = env->int_pgm_code; 72 switch (n) { 73 case PGM_OPERATION: 74 case PGM_PRIVILEGED: 75 sig = TARGET_SIGILL; 76 n = TARGET_ILL_ILLOPC; 77 goto do_signal_pc; 78 case PGM_PROTECTION: 79 case PGM_ADDRESSING: 80 sig = TARGET_SIGSEGV; 81 /* XXX: check env->error_code */ 82 n = TARGET_SEGV_MAPERR; 83 addr = env->__excp_addr & S390X_FAIL_ADDR_MASK; 84 goto do_signal; 85 case PGM_EXECUTE: 86 case PGM_SPECIFICATION: 87 case PGM_SPECIAL_OP: 88 case PGM_OPERAND: 89 do_sigill_opn: 90 sig = TARGET_SIGILL; 91 n = TARGET_ILL_ILLOPN; 92 goto do_signal_pc; 93 94 case PGM_FIXPT_OVERFLOW: 95 sig = TARGET_SIGFPE; 96 n = TARGET_FPE_INTOVF; 97 goto do_signal_pc; 98 case PGM_FIXPT_DIVIDE: 99 sig = TARGET_SIGFPE; 100 n = TARGET_FPE_INTDIV; 101 goto do_signal_pc; 102 103 case PGM_DATA: 104 n = (env->fpc >> 8) & 0xff; 105 if (n == 0xff) { 106 /* compare-and-trap */ 107 goto do_sigill_opn; 108 } else { 109 /* An IEEE exception, simulated or otherwise. */ 110 if (n & 0x80) { 111 n = TARGET_FPE_FLTINV; 112 } else if (n & 0x40) { 113 n = TARGET_FPE_FLTDIV; 114 } else if (n & 0x20) { 115 n = TARGET_FPE_FLTOVF; 116 } else if (n & 0x10) { 117 n = TARGET_FPE_FLTUND; 118 } else if (n & 0x08) { 119 n = TARGET_FPE_FLTRES; 120 } else { 121 /* ??? Quantum exception; BFP, DFP error. */ 122 goto do_sigill_opn; 123 } 124 sig = TARGET_SIGFPE; 125 goto do_signal_pc; 126 } 127 128 default: 129 fprintf(stderr, "Unhandled program exception: %#x\n", n); 130 cpu_dump_state(cs, stderr, fprintf, 0); 131 exit(EXIT_FAILURE); 132 } 133 break; 134 135 do_signal_pc: 136 addr = env->psw.addr; 137 do_signal: 138 info.si_signo = sig; 139 info.si_errno = 0; 140 info.si_code = n; 141 info._sifields._sigfault._addr = addr; 142 queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info); 143 break; 144 145 case EXCP_ATOMIC: 146 cpu_exec_step_atomic(cs); 147 break; 148 default: 149 fprintf(stderr, "Unhandled trap: 0x%x\n", trapnr); 150 cpu_dump_state(cs, stderr, fprintf, 0); 151 exit(EXIT_FAILURE); 152 } 153 process_pending_signals (env); 154 } 155 } 156 157 void target_cpu_copy_regs(CPUArchState *env, struct target_pt_regs *regs) 158 { 159 int i; 160 for (i = 0; i < 16; i++) { 161 env->regs[i] = regs->gprs[i]; 162 } 163 env->psw.mask = regs->psw.mask; 164 env->psw.addr = regs->psw.addr; 165 } 166