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 #include "signal-common.h" 25 26 /* s390x masks the fault address it reports in si_addr for SIGSEGV and SIGBUS */ 27 #define S390X_FAIL_ADDR_MASK -4096LL 28 29 static int get_pgm_data_si_code(int dxc_code) 30 { 31 switch (dxc_code) { 32 /* Non-simulated IEEE exceptions */ 33 case 0x80: 34 return TARGET_FPE_FLTINV; 35 case 0x40: 36 return TARGET_FPE_FLTDIV; 37 case 0x20: 38 case 0x28: 39 case 0x2c: 40 return TARGET_FPE_FLTOVF; 41 case 0x10: 42 case 0x18: 43 case 0x1c: 44 return TARGET_FPE_FLTUND; 45 case 0x08: 46 case 0x0c: 47 return TARGET_FPE_FLTRES; 48 } 49 /* 50 * Non-IEEE and simulated IEEE: 51 * Includes compare-and-trap, quantum exception, etc. 52 * Simulated IEEE are included here to match current 53 * s390x linux kernel. 54 */ 55 return 0; 56 } 57 58 void cpu_loop(CPUS390XState *env) 59 { 60 CPUState *cs = env_cpu(env); 61 int trapnr, n, sig; 62 target_siginfo_t info; 63 target_ulong addr; 64 abi_long ret; 65 66 while (1) { 67 cpu_exec_start(cs); 68 trapnr = cpu_exec(cs); 69 cpu_exec_end(cs); 70 process_queued_cpu_work(cs); 71 72 switch (trapnr) { 73 case EXCP_INTERRUPT: 74 /* Just indicate that signals should be handled asap. */ 75 break; 76 77 case EXCP_SVC: 78 n = env->int_svc_code; 79 if (!n) { 80 /* syscalls > 255 */ 81 n = env->regs[1]; 82 } 83 env->psw.addr += env->int_svc_ilen; 84 ret = do_syscall(env, n, env->regs[2], env->regs[3], 85 env->regs[4], env->regs[5], 86 env->regs[6], env->regs[7], 0, 0); 87 if (ret == -TARGET_ERESTARTSYS) { 88 env->psw.addr -= env->int_svc_ilen; 89 } else if (ret != -TARGET_QEMU_ESIGRETURN) { 90 env->regs[2] = ret; 91 } 92 break; 93 94 case EXCP_DEBUG: 95 sig = TARGET_SIGTRAP; 96 n = TARGET_TRAP_BRKPT; 97 /* 98 * For SIGTRAP the PSW must point after the instruction, which it 99 * already does thanks to s390x_tr_tb_stop(). si_addr doesn't need 100 * to be filled. 101 */ 102 addr = 0; 103 goto do_signal; 104 case EXCP_PGM: 105 n = env->int_pgm_code; 106 switch (n) { 107 case PGM_OPERATION: 108 case PGM_PRIVILEGED: 109 sig = TARGET_SIGILL; 110 n = TARGET_ILL_ILLOPC; 111 goto do_signal_pc; 112 case PGM_PROTECTION: 113 case PGM_ADDRESSING: 114 sig = TARGET_SIGSEGV; 115 /* XXX: check env->error_code */ 116 n = TARGET_SEGV_MAPERR; 117 addr = env->__excp_addr & S390X_FAIL_ADDR_MASK; 118 goto do_signal; 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