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 void cpu_loop(CPUAlphaState *env) 28 { 29 CPUState *cs = env_cpu(env); 30 int trapnr; 31 target_siginfo_t info; 32 abi_long sysret; 33 34 while (1) { 35 bool arch_interrupt = true; 36 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_RESET: 44 fprintf(stderr, "Reset requested. Exit\n"); 45 exit(EXIT_FAILURE); 46 break; 47 case EXCP_MCHK: 48 fprintf(stderr, "Machine check exception. Exit\n"); 49 exit(EXIT_FAILURE); 50 break; 51 case EXCP_SMP_INTERRUPT: 52 case EXCP_CLK_INTERRUPT: 53 case EXCP_DEV_INTERRUPT: 54 fprintf(stderr, "External interrupt. Exit\n"); 55 exit(EXIT_FAILURE); 56 break; 57 case EXCP_UNALIGN: 58 info.si_signo = TARGET_SIGBUS; 59 info.si_errno = 0; 60 info.si_code = TARGET_BUS_ADRALN; 61 info._sifields._sigfault._addr = env->trap_arg0; 62 queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info); 63 break; 64 case EXCP_OPCDEC: 65 do_sigill: 66 info.si_signo = TARGET_SIGILL; 67 info.si_errno = 0; 68 info.si_code = TARGET_ILL_ILLOPC; 69 info._sifields._sigfault._addr = env->pc; 70 queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info); 71 break; 72 case EXCP_ARITH: 73 info.si_signo = TARGET_SIGFPE; 74 info.si_errno = 0; 75 info.si_code = TARGET_FPE_FLTINV; 76 info._sifields._sigfault._addr = env->pc; 77 queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info); 78 break; 79 case EXCP_FEN: 80 /* No-op. Linux simply re-enables the FPU. */ 81 break; 82 case EXCP_CALL_PAL: 83 switch (env->error_code) { 84 case 0x80: 85 /* BPT */ 86 info.si_signo = TARGET_SIGTRAP; 87 info.si_errno = 0; 88 info.si_code = TARGET_TRAP_BRKPT; 89 info._sifields._sigfault._addr = env->pc; 90 queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info); 91 break; 92 case 0x81: 93 /* BUGCHK */ 94 info.si_signo = TARGET_SIGTRAP; 95 info.si_errno = 0; 96 info.si_code = 0; 97 info._sifields._sigfault._addr = env->pc; 98 queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info); 99 break; 100 case 0x83: 101 /* CALLSYS */ 102 trapnr = env->ir[IR_V0]; 103 sysret = do_syscall(env, trapnr, 104 env->ir[IR_A0], env->ir[IR_A1], 105 env->ir[IR_A2], env->ir[IR_A3], 106 env->ir[IR_A4], env->ir[IR_A5], 107 0, 0); 108 if (sysret == -TARGET_ERESTARTSYS) { 109 env->pc -= 4; 110 break; 111 } 112 if (sysret == -TARGET_QEMU_ESIGRETURN) { 113 break; 114 } 115 /* Syscall writes 0 to V0 to bypass error check, similar 116 to how this is handled internal to Linux kernel. 117 (Ab)use trapnr temporarily as boolean indicating error. */ 118 trapnr = (env->ir[IR_V0] != 0 && sysret < 0); 119 env->ir[IR_V0] = (trapnr ? -sysret : sysret); 120 env->ir[IR_A3] = trapnr; 121 break; 122 case 0x86: 123 /* IMB */ 124 /* ??? We can probably elide the code using page_unprotect 125 that is checking for self-modifying code. Instead we 126 could simply call tb_flush here. Until we work out the 127 changes required to turn off the extra write protection, 128 this can be a no-op. */ 129 break; 130 case 0x9E: 131 /* RDUNIQUE */ 132 /* Handled in the translator for usermode. */ 133 abort(); 134 case 0x9F: 135 /* WRUNIQUE */ 136 /* Handled in the translator for usermode. */ 137 abort(); 138 case 0xAA: 139 /* GENTRAP */ 140 info.si_signo = TARGET_SIGFPE; 141 switch (env->ir[IR_A0]) { 142 case TARGET_GEN_INTOVF: 143 info.si_code = TARGET_FPE_INTOVF; 144 break; 145 case TARGET_GEN_INTDIV: 146 info.si_code = TARGET_FPE_INTDIV; 147 break; 148 case TARGET_GEN_FLTOVF: 149 info.si_code = TARGET_FPE_FLTOVF; 150 break; 151 case TARGET_GEN_FLTUND: 152 info.si_code = TARGET_FPE_FLTUND; 153 break; 154 case TARGET_GEN_FLTINV: 155 info.si_code = TARGET_FPE_FLTINV; 156 break; 157 case TARGET_GEN_FLTINE: 158 info.si_code = TARGET_FPE_FLTRES; 159 break; 160 case TARGET_GEN_ROPRAND: 161 info.si_code = 0; 162 break; 163 default: 164 info.si_signo = TARGET_SIGTRAP; 165 info.si_code = 0; 166 break; 167 } 168 info.si_errno = 0; 169 info._sifields._sigfault._addr = env->pc; 170 queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info); 171 break; 172 default: 173 goto do_sigill; 174 } 175 break; 176 case EXCP_DEBUG: 177 info.si_signo = TARGET_SIGTRAP; 178 info.si_errno = 0; 179 info.si_code = TARGET_TRAP_BRKPT; 180 queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info); 181 break; 182 case EXCP_INTERRUPT: 183 /* Just indicate that signals should be handled asap. */ 184 break; 185 case EXCP_ATOMIC: 186 cpu_exec_step_atomic(cs); 187 arch_interrupt = false; 188 break; 189 default: 190 fprintf(stderr, "Unhandled trap: 0x%x\n", trapnr); 191 cpu_dump_state(cs, stderr, 0); 192 exit(EXIT_FAILURE); 193 } 194 process_pending_signals (env); 195 196 /* Most of the traps imply a transition through PALcode, which 197 implies an REI instruction has been executed. Which means 198 that RX and LOCK_ADDR should be cleared. But there are a 199 few exceptions for traps internal to QEMU. */ 200 if (arch_interrupt) { 201 env->flags &= ~ENV_FLAG_RX_FLAG; 202 env->lock_addr = -1; 203 } 204 } 205 } 206 207 void target_cpu_copy_regs(CPUArchState *env, struct target_pt_regs *regs) 208 { 209 int i; 210 211 for(i = 0; i < 28; i++) { 212 env->ir[i] = ((abi_ulong *)regs)[i]; 213 } 214 env->ir[IR_SP] = regs->usp; 215 env->pc = regs->pc; 216 } 217