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 "user-internals.h" 23 #include "cpu_loop-common.h" 24 #include "signal-common.h" 25 26 27 static int get_pgm_data_si_code(int dxc_code) 28 { 29 switch (dxc_code) { 30 /* Non-simulated IEEE exceptions */ 31 case 0x80: 32 return TARGET_FPE_FLTINV; 33 case 0x40: 34 return TARGET_FPE_FLTDIV; 35 case 0x20: 36 case 0x28: 37 case 0x2c: 38 return TARGET_FPE_FLTOVF; 39 case 0x10: 40 case 0x18: 41 case 0x1c: 42 return TARGET_FPE_FLTUND; 43 case 0x08: 44 case 0x0c: 45 return TARGET_FPE_FLTRES; 46 } 47 /* 48 * Non-IEEE and simulated IEEE: 49 * Includes compare-and-trap, quantum exception, etc. 50 * Simulated IEEE are included here to match current 51 * s390x linux kernel. 52 */ 53 return 0; 54 } 55 56 void cpu_loop(CPUS390XState *env) 57 { 58 CPUState *cs = env_cpu(env); 59 int trapnr, n, sig; 60 target_ulong addr; 61 abi_long ret; 62 63 while (1) { 64 cpu_exec_start(cs); 65 trapnr = cpu_exec(cs); 66 cpu_exec_end(cs); 67 process_queued_cpu_work(cs); 68 69 switch (trapnr) { 70 case EXCP_INTERRUPT: 71 /* Just indicate that signals should be handled asap. */ 72 break; 73 74 case EXCP_SVC: 75 n = env->int_svc_code; 76 if (!n) { 77 /* syscalls > 255 */ 78 n = env->regs[1]; 79 } 80 env->psw.addr += env->int_svc_ilen; 81 ret = do_syscall(env, n, env->regs[2], env->regs[3], 82 env->regs[4], env->regs[5], 83 env->regs[6], env->regs[7], 0, 0); 84 if (ret == -QEMU_ERESTARTSYS) { 85 env->psw.addr -= env->int_svc_ilen; 86 } else if (ret != -QEMU_ESIGRETURN) { 87 env->regs[2] = ret; 88 } 89 break; 90 91 case EXCP_DEBUG: 92 sig = TARGET_SIGTRAP; 93 n = TARGET_TRAP_BRKPT; 94 /* 95 * For SIGTRAP the PSW must point after the instruction, which it 96 * already does thanks to s390x_tr_tb_stop(). si_addr doesn't need 97 * to be filled. 98 */ 99 addr = 0; 100 goto do_signal; 101 case EXCP_PGM: 102 n = env->int_pgm_code; 103 switch (n) { 104 case PGM_OPERATION: 105 case PGM_PRIVILEGED: 106 sig = TARGET_SIGILL; 107 n = TARGET_ILL_ILLOPC; 108 goto do_signal_pc; 109 case PGM_PROTECTION: 110 force_sig_fault(TARGET_SIGSEGV, TARGET_SEGV_ACCERR, 111 env->__excp_addr); 112 break; 113 case PGM_ADDRESSING: 114 force_sig_fault(TARGET_SIGSEGV, TARGET_SEGV_MAPERR, 115 env->__excp_addr); 116 break; 117 case PGM_EXECUTE: 118 case PGM_SPECIFICATION: 119 case PGM_SPECIAL_OP: 120 case PGM_OPERAND: 121 do_sigill_opn: 122 sig = TARGET_SIGILL; 123 n = TARGET_ILL_ILLOPN; 124 goto do_signal_pc; 125 126 case PGM_FIXPT_OVERFLOW: 127 sig = TARGET_SIGFPE; 128 n = TARGET_FPE_INTOVF; 129 goto do_signal_pc; 130 case PGM_FIXPT_DIVIDE: 131 sig = TARGET_SIGFPE; 132 n = TARGET_FPE_INTDIV; 133 goto do_signal_pc; 134 135 case PGM_DATA: 136 n = (env->fpc >> 8) & 0xff; 137 if (n == 0) { 138 goto do_sigill_opn; 139 } 140 141 sig = TARGET_SIGFPE; 142 n = get_pgm_data_si_code(n); 143 goto do_signal_pc; 144 145 default: 146 fprintf(stderr, "Unhandled program exception: %#x\n", n); 147 cpu_dump_state(cs, stderr, 0); 148 exit(EXIT_FAILURE); 149 } 150 break; 151 152 do_signal_pc: 153 addr = env->psw.addr; 154 /* 155 * For SIGILL and SIGFPE the PSW must point after the instruction. 156 */ 157 env->psw.addr += env->int_pgm_ilen; 158 do_signal: 159 force_sig_fault(sig, n, addr); 160 break; 161 162 case EXCP_ATOMIC: 163 cpu_exec_step_atomic(cs); 164 break; 165 default: 166 fprintf(stderr, "Unhandled trap: 0x%x\n", trapnr); 167 cpu_dump_state(cs, stderr, 0); 168 exit(EXIT_FAILURE); 169 } 170 process_pending_signals (env); 171 } 172 } 173 174 void target_cpu_copy_regs(CPUArchState *env, struct target_pt_regs *regs) 175 { 176 int i; 177 for (i = 0; i < 16; i++) { 178 env->regs[i] = regs->gprs[i]; 179 } 180 env->psw.mask = regs->psw.mask; 181 env->psw.addr = regs->psw.addr; 182 } 183