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 void cpu_loop(CPUAlphaState *env) 27 { 28 CPUState *cs = env_cpu(env); 29 int trapnr; 30 target_siginfo_t info; 31 abi_long sysret; 32 33 while (1) { 34 bool arch_interrupt = true; 35 36 cpu_exec_start(cs); 37 trapnr = cpu_exec(cs); 38 cpu_exec_end(cs); 39 process_queued_cpu_work(cs); 40 41 switch (trapnr) { 42 case EXCP_RESET: 43 fprintf(stderr, "Reset requested. Exit\n"); 44 exit(EXIT_FAILURE); 45 break; 46 case EXCP_MCHK: 47 fprintf(stderr, "Machine check exception. Exit\n"); 48 exit(EXIT_FAILURE); 49 break; 50 case EXCP_SMP_INTERRUPT: 51 case EXCP_CLK_INTERRUPT: 52 case EXCP_DEV_INTERRUPT: 53 fprintf(stderr, "External interrupt. Exit\n"); 54 exit(EXIT_FAILURE); 55 break; 56 case EXCP_MMFAULT: 57 info.si_signo = TARGET_SIGSEGV; 58 info.si_errno = 0; 59 info.si_code = (page_get_flags(env->trap_arg0) & PAGE_VALID 60 ? TARGET_SEGV_ACCERR : TARGET_SEGV_MAPERR); 61 info._sifields._sigfault._addr = env->trap_arg0; 62 queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info); 63 break; 64 case EXCP_UNALIGN: 65 info.si_signo = TARGET_SIGBUS; 66 info.si_errno = 0; 67 info.si_code = TARGET_BUS_ADRALN; 68 info._sifields._sigfault._addr = env->trap_arg0; 69 queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info); 70 break; 71 case EXCP_OPCDEC: 72 do_sigill: 73 info.si_signo = TARGET_SIGILL; 74 info.si_errno = 0; 75 info.si_code = TARGET_ILL_ILLOPC; 76 info._sifields._sigfault._addr = env->pc; 77 queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info); 78 break; 79 case EXCP_ARITH: 80 info.si_signo = TARGET_SIGFPE; 81 info.si_errno = 0; 82 info.si_code = TARGET_FPE_FLTINV; 83 info._sifields._sigfault._addr = env->pc; 84 queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info); 85 break; 86 case EXCP_FEN: 87 /* No-op. Linux simply re-enables the FPU. */ 88 break; 89 case EXCP_CALL_PAL: 90 switch (env->error_code) { 91 case 0x80: 92 /* BPT */ 93 info.si_signo = TARGET_SIGTRAP; 94 info.si_errno = 0; 95 info.si_code = TARGET_TRAP_BRKPT; 96 info._sifields._sigfault._addr = env->pc; 97 queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info); 98 break; 99 case 0x81: 100 /* BUGCHK */ 101 info.si_signo = TARGET_SIGTRAP; 102 info.si_errno = 0; 103 info.si_code = 0; 104 info._sifields._sigfault._addr = env->pc; 105 queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info); 106 break; 107 case 0x83: 108 /* CALLSYS */ 109 trapnr = env->ir[IR_V0]; 110 sysret = do_syscall(env, trapnr, 111 env->ir[IR_A0], env->ir[IR_A1], 112 env->ir[IR_A2], env->ir[IR_A3], 113 env->ir[IR_A4], env->ir[IR_A5], 114 0, 0); 115 if (sysret == -TARGET_ERESTARTSYS) { 116 env->pc -= 4; 117 break; 118 } 119 if (sysret == -TARGET_QEMU_ESIGRETURN) { 120 break; 121 } 122 /* Syscall writes 0 to V0 to bypass error check, similar 123 to how this is handled internal to Linux kernel. 124 (Ab)use trapnr temporarily as boolean indicating error. */ 125 trapnr = (env->ir[IR_V0] != 0 && sysret < 0); 126 env->ir[IR_V0] = (trapnr ? -sysret : sysret); 127 env->ir[IR_A3] = trapnr; 128 break; 129 case 0x86: 130 /* IMB */ 131 /* ??? We can probably elide the code using page_unprotect 132 that is checking for self-modifying code. Instead we 133 could simply call tb_flush here. Until we work out the 134 changes required to turn off the extra write protection, 135 this can be a no-op. */ 136 break; 137 case 0x9E: 138 /* RDUNIQUE */ 139 /* Handled in the translator for usermode. */ 140 abort(); 141 case 0x9F: 142 /* WRUNIQUE */ 143 /* Handled in the translator for usermode. */ 144 abort(); 145 case 0xAA: 146 /* GENTRAP */ 147 info.si_signo = TARGET_SIGFPE; 148 switch (env->ir[IR_A0]) { 149 case TARGET_GEN_INTOVF: 150 info.si_code = TARGET_FPE_INTOVF; 151 break; 152 case TARGET_GEN_INTDIV: 153 info.si_code = TARGET_FPE_INTDIV; 154 break; 155 case TARGET_GEN_FLTOVF: 156 info.si_code = TARGET_FPE_FLTOVF; 157 break; 158 case TARGET_GEN_FLTUND: 159 info.si_code = TARGET_FPE_FLTUND; 160 break; 161 case TARGET_GEN_FLTINV: 162 info.si_code = TARGET_FPE_FLTINV; 163 break; 164 case TARGET_GEN_FLTINE: 165 info.si_code = TARGET_FPE_FLTRES; 166 break; 167 case TARGET_GEN_ROPRAND: 168 info.si_code = 0; 169 break; 170 default: 171 info.si_signo = TARGET_SIGTRAP; 172 info.si_code = 0; 173 break; 174 } 175 info.si_errno = 0; 176 info._sifields._sigfault._addr = env->pc; 177 queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info); 178 break; 179 default: 180 goto do_sigill; 181 } 182 break; 183 case EXCP_DEBUG: 184 info.si_signo = TARGET_SIGTRAP; 185 info.si_errno = 0; 186 info.si_code = TARGET_TRAP_BRKPT; 187 queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info); 188 break; 189 case EXCP_INTERRUPT: 190 /* Just indicate that signals should be handled asap. */ 191 break; 192 case EXCP_ATOMIC: 193 cpu_exec_step_atomic(cs); 194 arch_interrupt = false; 195 break; 196 default: 197 fprintf(stderr, "Unhandled trap: 0x%x\n", trapnr); 198 cpu_dump_state(cs, stderr, 0); 199 exit(EXIT_FAILURE); 200 } 201 process_pending_signals (env); 202 203 /* Most of the traps imply a transition through PALcode, which 204 implies an REI instruction has been executed. Which means 205 that RX and LOCK_ADDR should be cleared. But there are a 206 few exceptions for traps internal to QEMU. */ 207 if (arch_interrupt) { 208 env->flags &= ~ENV_FLAG_RX_FLAG; 209 env->lock_addr = -1; 210 } 211 } 212 } 213 214 void target_cpu_copy_regs(CPUArchState *env, struct target_pt_regs *regs) 215 { 216 int i; 217 218 for(i = 0; i < 28; i++) { 219 env->ir[i] = ((abi_ulong *)regs)[i]; 220 } 221 env->ir[IR_SP] = regs->usp; 222 env->pc = regs->pc; 223 } 224