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 = TARGET_SIGTRAP; 65 n = TARGET_TRAP_BRKPT; 66 goto do_signal_pc; 67 case EXCP_PGM: 68 n = env->int_pgm_code; 69 switch (n) { 70 case PGM_OPERATION: 71 case PGM_PRIVILEGED: 72 sig = TARGET_SIGILL; 73 n = TARGET_ILL_ILLOPC; 74 goto do_signal_pc; 75 case PGM_PROTECTION: 76 case PGM_ADDRESSING: 77 sig = TARGET_SIGSEGV; 78 /* XXX: check env->error_code */ 79 n = TARGET_SEGV_MAPERR; 80 addr = env->__excp_addr & S390X_FAIL_ADDR_MASK; 81 goto do_signal; 82 case PGM_EXECUTE: 83 case PGM_SPECIFICATION: 84 case PGM_SPECIAL_OP: 85 case PGM_OPERAND: 86 do_sigill_opn: 87 sig = TARGET_SIGILL; 88 n = TARGET_ILL_ILLOPN; 89 goto do_signal_pc; 90 91 case PGM_FIXPT_OVERFLOW: 92 sig = TARGET_SIGFPE; 93 n = TARGET_FPE_INTOVF; 94 goto do_signal_pc; 95 case PGM_FIXPT_DIVIDE: 96 sig = TARGET_SIGFPE; 97 n = TARGET_FPE_INTDIV; 98 goto do_signal_pc; 99 100 case PGM_DATA: 101 n = (env->fpc >> 8) & 0xff; 102 if (n == 0xff) { 103 /* compare-and-trap */ 104 goto do_sigill_opn; 105 } else { 106 /* An IEEE exception, simulated or otherwise. */ 107 if (n & 0x80) { 108 n = TARGET_FPE_FLTINV; 109 } else if (n & 0x40) { 110 n = TARGET_FPE_FLTDIV; 111 } else if (n & 0x20) { 112 n = TARGET_FPE_FLTOVF; 113 } else if (n & 0x10) { 114 n = TARGET_FPE_FLTUND; 115 } else if (n & 0x08) { 116 n = TARGET_FPE_FLTRES; 117 } else { 118 /* ??? Quantum exception; BFP, DFP error. */ 119 goto do_sigill_opn; 120 } 121 sig = TARGET_SIGFPE; 122 goto do_signal_pc; 123 } 124 125 default: 126 fprintf(stderr, "Unhandled program exception: %#x\n", n); 127 cpu_dump_state(cs, stderr, fprintf, 0); 128 exit(EXIT_FAILURE); 129 } 130 break; 131 132 do_signal_pc: 133 addr = env->psw.addr; 134 do_signal: 135 info.si_signo = sig; 136 info.si_errno = 0; 137 info.si_code = n; 138 info._sifields._sigfault._addr = addr; 139 queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info); 140 break; 141 142 case EXCP_ATOMIC: 143 cpu_exec_step_atomic(cs); 144 break; 145 default: 146 fprintf(stderr, "Unhandled trap: 0x%x\n", trapnr); 147 cpu_dump_state(cs, stderr, fprintf, 0); 148 exit(EXIT_FAILURE); 149 } 150 process_pending_signals (env); 151 } 152 } 153 154 void target_cpu_copy_regs(CPUArchState *env, struct target_pt_regs *regs) 155 { 156 int i; 157 for (i = 0; i < 16; i++) { 158 env->regs[i] = regs->gprs[i]; 159 } 160 env->psw.mask = regs->psw.mask; 161 env->psw.addr = regs->psw.addr; 162 } 163