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 /* 68 * For SIGTRAP the PSW must point after the instruction, which it 69 * already does thanks to s390x_tr_tb_stop(). si_addr doesn't need 70 * to be filled. 71 */ 72 addr = 0; 73 goto do_signal; 74 case EXCP_PGM: 75 n = env->int_pgm_code; 76 switch (n) { 77 case PGM_OPERATION: 78 case PGM_PRIVILEGED: 79 sig = TARGET_SIGILL; 80 n = TARGET_ILL_ILLOPC; 81 goto do_signal_pc; 82 case PGM_PROTECTION: 83 case PGM_ADDRESSING: 84 sig = TARGET_SIGSEGV; 85 /* XXX: check env->error_code */ 86 n = TARGET_SEGV_MAPERR; 87 addr = env->__excp_addr & S390X_FAIL_ADDR_MASK; 88 goto do_signal; 89 case PGM_EXECUTE: 90 case PGM_SPECIFICATION: 91 case PGM_SPECIAL_OP: 92 case PGM_OPERAND: 93 do_sigill_opn: 94 sig = TARGET_SIGILL; 95 n = TARGET_ILL_ILLOPN; 96 goto do_signal_pc; 97 98 case PGM_FIXPT_OVERFLOW: 99 sig = TARGET_SIGFPE; 100 n = TARGET_FPE_INTOVF; 101 goto do_signal_pc; 102 case PGM_FIXPT_DIVIDE: 103 sig = TARGET_SIGFPE; 104 n = TARGET_FPE_INTDIV; 105 goto do_signal_pc; 106 107 case PGM_DATA: 108 n = (env->fpc >> 8) & 0xff; 109 if (n == 0xff) { 110 /* compare-and-trap */ 111 goto do_sigill_opn; 112 } else { 113 /* An IEEE exception, simulated or otherwise. */ 114 if (n & 0x80) { 115 n = TARGET_FPE_FLTINV; 116 } else if (n & 0x40) { 117 n = TARGET_FPE_FLTDIV; 118 } else if (n & 0x20) { 119 n = TARGET_FPE_FLTOVF; 120 } else if (n & 0x10) { 121 n = TARGET_FPE_FLTUND; 122 } else if (n & 0x08) { 123 n = TARGET_FPE_FLTRES; 124 } else { 125 /* ??? Quantum exception; BFP, DFP error. */ 126 goto do_sigill_opn; 127 } 128 sig = TARGET_SIGFPE; 129 goto do_signal_pc; 130 } 131 132 default: 133 fprintf(stderr, "Unhandled program exception: %#x\n", n); 134 cpu_dump_state(cs, stderr, 0); 135 exit(EXIT_FAILURE); 136 } 137 break; 138 139 do_signal_pc: 140 addr = env->psw.addr; 141 /* 142 * For SIGILL and SIGFPE the PSW must point after the instruction. 143 */ 144 env->psw.addr += env->int_pgm_ilen; 145 do_signal: 146 info.si_signo = sig; 147 info.si_errno = 0; 148 info.si_code = n; 149 info._sifields._sigfault._addr = addr; 150 queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info); 151 break; 152 153 case EXCP_ATOMIC: 154 cpu_exec_step_atomic(cs); 155 break; 156 default: 157 fprintf(stderr, "Unhandled trap: 0x%x\n", trapnr); 158 cpu_dump_state(cs, stderr, 0); 159 exit(EXIT_FAILURE); 160 } 161 process_pending_signals (env); 162 } 163 } 164 165 void target_cpu_copy_regs(CPUArchState *env, struct target_pt_regs *regs) 166 { 167 int i; 168 for (i = 0; i < 16; i++) { 169 env->regs[i] = regs->gprs[i]; 170 } 171 env->psw.mask = regs->psw.mask; 172 env->psw.addr = regs->psw.addr; 173 } 174