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 /* s390x masks the fault address it reports in si_addr for SIGSEGV and SIGBUS */ 28 #define S390X_FAIL_ADDR_MASK -4096LL 29 30 static int get_pgm_data_si_code(int dxc_code) 31 { 32 switch (dxc_code) { 33 /* Non-simulated IEEE exceptions */ 34 case 0x80: 35 return TARGET_FPE_FLTINV; 36 case 0x40: 37 return TARGET_FPE_FLTDIV; 38 case 0x20: 39 case 0x28: 40 case 0x2c: 41 return TARGET_FPE_FLTOVF; 42 case 0x10: 43 case 0x18: 44 case 0x1c: 45 return TARGET_FPE_FLTUND; 46 case 0x08: 47 case 0x0c: 48 return TARGET_FPE_FLTRES; 49 } 50 /* 51 * Non-IEEE and simulated IEEE: 52 * Includes compare-and-trap, quantum exception, etc. 53 * Simulated IEEE are included here to match current 54 * s390x linux kernel. 55 */ 56 return 0; 57 } 58 59 void cpu_loop(CPUS390XState *env) 60 { 61 CPUState *cs = env_cpu(env); 62 int trapnr, n, sig; 63 target_siginfo_t info; 64 target_ulong addr; 65 abi_long ret; 66 67 while (1) { 68 cpu_exec_start(cs); 69 trapnr = cpu_exec(cs); 70 cpu_exec_end(cs); 71 process_queued_cpu_work(cs); 72 73 switch (trapnr) { 74 case EXCP_INTERRUPT: 75 /* Just indicate that signals should be handled asap. */ 76 break; 77 78 case EXCP_SVC: 79 n = env->int_svc_code; 80 if (!n) { 81 /* syscalls > 255 */ 82 n = env->regs[1]; 83 } 84 env->psw.addr += env->int_svc_ilen; 85 ret = do_syscall(env, n, env->regs[2], env->regs[3], 86 env->regs[4], env->regs[5], 87 env->regs[6], env->regs[7], 0, 0); 88 if (ret == -TARGET_ERESTARTSYS) { 89 env->psw.addr -= env->int_svc_ilen; 90 } else if (ret != -TARGET_QEMU_ESIGRETURN) { 91 env->regs[2] = ret; 92 } 93 break; 94 95 case EXCP_DEBUG: 96 sig = TARGET_SIGTRAP; 97 n = TARGET_TRAP_BRKPT; 98 /* 99 * For SIGTRAP the PSW must point after the instruction, which it 100 * already does thanks to s390x_tr_tb_stop(). si_addr doesn't need 101 * to be filled. 102 */ 103 addr = 0; 104 goto do_signal; 105 case EXCP_PGM: 106 n = env->int_pgm_code; 107 switch (n) { 108 case PGM_OPERATION: 109 case PGM_PRIVILEGED: 110 sig = TARGET_SIGILL; 111 n = TARGET_ILL_ILLOPC; 112 goto do_signal_pc; 113 case PGM_PROTECTION: 114 case PGM_ADDRESSING: 115 sig = TARGET_SIGSEGV; 116 /* XXX: check env->error_code */ 117 n = TARGET_SEGV_MAPERR; 118 addr = env->__excp_addr & S390X_FAIL_ADDR_MASK; 119 goto do_signal; 120 case PGM_EXECUTE: 121 case PGM_SPECIFICATION: 122 case PGM_SPECIAL_OP: 123 case PGM_OPERAND: 124 do_sigill_opn: 125 sig = TARGET_SIGILL; 126 n = TARGET_ILL_ILLOPN; 127 goto do_signal_pc; 128 129 case PGM_FIXPT_OVERFLOW: 130 sig = TARGET_SIGFPE; 131 n = TARGET_FPE_INTOVF; 132 goto do_signal_pc; 133 case PGM_FIXPT_DIVIDE: 134 sig = TARGET_SIGFPE; 135 n = TARGET_FPE_INTDIV; 136 goto do_signal_pc; 137 138 case PGM_DATA: 139 n = (env->fpc >> 8) & 0xff; 140 if (n == 0) { 141 goto do_sigill_opn; 142 } 143 144 sig = TARGET_SIGFPE; 145 n = get_pgm_data_si_code(n); 146 goto do_signal_pc; 147 148 default: 149 fprintf(stderr, "Unhandled program exception: %#x\n", n); 150 cpu_dump_state(cs, stderr, 0); 151 exit(EXIT_FAILURE); 152 } 153 break; 154 155 do_signal_pc: 156 addr = env->psw.addr; 157 /* 158 * For SIGILL and SIGFPE the PSW must point after the instruction. 159 */ 160 env->psw.addr += env->int_pgm_ilen; 161 do_signal: 162 info.si_signo = sig; 163 info.si_errno = 0; 164 info.si_code = n; 165 info._sifields._sigfault._addr = addr; 166 queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info); 167 break; 168 169 case EXCP_ATOMIC: 170 cpu_exec_step_atomic(cs); 171 break; 172 default: 173 fprintf(stderr, "Unhandled trap: 0x%x\n", trapnr); 174 cpu_dump_state(cs, stderr, 0); 175 exit(EXIT_FAILURE); 176 } 177 process_pending_signals (env); 178 } 179 } 180 181 void target_cpu_copy_regs(CPUArchState *env, struct target_pt_regs *regs) 182 { 183 int i; 184 for (i = 0; i < 16; i++) { 185 env->regs[i] = regs->gprs[i]; 186 } 187 env->psw.mask = regs->psw.mask; 188 env->psw.addr = regs->psw.addr; 189 } 190