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