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 "user-internals.h" 24 #include "cpu_loop-common.h" 25 #include "signal-common.h" 26 27 28 static int get_pgm_data_si_code(int dxc_code) 29 { 30 switch (dxc_code) { 31 /* Non-simulated IEEE exceptions */ 32 case 0x80: 33 return TARGET_FPE_FLTINV; 34 case 0x40: 35 return TARGET_FPE_FLTDIV; 36 case 0x20: 37 case 0x28: 38 case 0x2c: 39 return TARGET_FPE_FLTOVF; 40 case 0x10: 41 case 0x18: 42 case 0x1c: 43 return TARGET_FPE_FLTUND; 44 case 0x08: 45 case 0x0c: 46 return TARGET_FPE_FLTRES; 47 } 48 /* 49 * Non-IEEE and simulated IEEE: 50 * Includes compare-and-trap, quantum exception, etc. 51 * Simulated IEEE are included here to match current 52 * s390x linux kernel. 53 */ 54 return 0; 55 } 56 57 void cpu_loop(CPUS390XState *env) 58 { 59 CPUState *cs = env_cpu(env); 60 int trapnr, n, sig; 61 target_siginfo_t info; 62 target_ulong addr; 63 abi_long ret; 64 65 while (1) { 66 cpu_exec_start(cs); 67 trapnr = cpu_exec(cs); 68 cpu_exec_end(cs); 69 process_queued_cpu_work(cs); 70 71 switch (trapnr) { 72 case EXCP_INTERRUPT: 73 /* Just indicate that signals should be handled asap. */ 74 break; 75 76 case EXCP_SVC: 77 n = env->int_svc_code; 78 if (!n) { 79 /* syscalls > 255 */ 80 n = env->regs[1]; 81 } 82 env->psw.addr += env->int_svc_ilen; 83 ret = do_syscall(env, n, env->regs[2], env->regs[3], 84 env->regs[4], env->regs[5], 85 env->regs[6], env->regs[7], 0, 0); 86 if (ret == -QEMU_ERESTARTSYS) { 87 env->psw.addr -= env->int_svc_ilen; 88 } else if (ret != -QEMU_ESIGRETURN) { 89 env->regs[2] = ret; 90 } 91 break; 92 93 case EXCP_DEBUG: 94 sig = TARGET_SIGTRAP; 95 n = TARGET_TRAP_BRKPT; 96 /* 97 * For SIGTRAP the PSW must point after the instruction, which it 98 * already does thanks to s390x_tr_tb_stop(). si_addr doesn't need 99 * to be filled. 100 */ 101 addr = 0; 102 goto do_signal; 103 case EXCP_PGM: 104 n = env->int_pgm_code; 105 switch (n) { 106 case PGM_OPERATION: 107 case PGM_PRIVILEGED: 108 sig = TARGET_SIGILL; 109 n = TARGET_ILL_ILLOPC; 110 goto do_signal_pc; 111 case PGM_PROTECTION: 112 force_sig_fault(TARGET_SIGSEGV, TARGET_SEGV_ACCERR, 113 env->__excp_addr); 114 break; 115 case PGM_ADDRESSING: 116 force_sig_fault(TARGET_SIGSEGV, TARGET_SEGV_MAPERR, 117 env->__excp_addr); 118 break; 119 case PGM_EXECUTE: 120 case PGM_SPECIFICATION: 121 case PGM_SPECIAL_OP: 122 case PGM_OPERAND: 123 do_sigill_opn: 124 sig = TARGET_SIGILL; 125 n = TARGET_ILL_ILLOPN; 126 goto do_signal_pc; 127 128 case PGM_FIXPT_OVERFLOW: 129 sig = TARGET_SIGFPE; 130 n = TARGET_FPE_INTOVF; 131 goto do_signal_pc; 132 case PGM_FIXPT_DIVIDE: 133 sig = TARGET_SIGFPE; 134 n = TARGET_FPE_INTDIV; 135 goto do_signal_pc; 136 137 case PGM_DATA: 138 n = (env->fpc >> 8) & 0xff; 139 if (n == 0) { 140 goto do_sigill_opn; 141 } 142 143 sig = TARGET_SIGFPE; 144 n = get_pgm_data_si_code(n); 145 goto do_signal_pc; 146 147 default: 148 fprintf(stderr, "Unhandled program exception: %#x\n", n); 149 cpu_dump_state(cs, stderr, 0); 150 exit(EXIT_FAILURE); 151 } 152 break; 153 154 do_signal_pc: 155 addr = env->psw.addr; 156 /* 157 * For SIGILL and SIGFPE the PSW must point after the instruction. 158 */ 159 env->psw.addr += env->int_pgm_ilen; 160 do_signal: 161 info.si_signo = sig; 162 info.si_errno = 0; 163 info.si_code = n; 164 info._sifields._sigfault._addr = addr; 165 queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info); 166 break; 167 168 case EXCP_ATOMIC: 169 cpu_exec_step_atomic(cs); 170 break; 171 default: 172 fprintf(stderr, "Unhandled trap: 0x%x\n", trapnr); 173 cpu_dump_state(cs, stderr, 0); 174 exit(EXIT_FAILURE); 175 } 176 process_pending_signals (env); 177 } 178 } 179 180 void target_cpu_copy_regs(CPUArchState *env, struct target_pt_regs *regs) 181 { 182 int i; 183 for (i = 0; i < 16; i++) { 184 env->regs[i] = regs->gprs[i]; 185 } 186 env->psw.mask = regs->psw.mask; 187 env->psw.addr = regs->psw.addr; 188 } 189