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 } 164