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_MMFAULT: 58 info.si_signo = TARGET_SIGSEGV; 59 info.si_errno = 0; 60 info.si_code = (page_get_flags(env->trap_arg0) & PAGE_VALID 61 ? TARGET_SEGV_ACCERR : TARGET_SEGV_MAPERR); 62 info._sifields._sigfault._addr = env->trap_arg0; 63 queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info); 64 break; 65 case EXCP_UNALIGN: 66 info.si_signo = TARGET_SIGBUS; 67 info.si_errno = 0; 68 info.si_code = TARGET_BUS_ADRALN; 69 info._sifields._sigfault._addr = env->trap_arg0; 70 queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info); 71 break; 72 case EXCP_OPCDEC: 73 do_sigill: 74 info.si_signo = TARGET_SIGILL; 75 info.si_errno = 0; 76 info.si_code = TARGET_ILL_ILLOPC; 77 info._sifields._sigfault._addr = env->pc; 78 queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info); 79 break; 80 case EXCP_ARITH: 81 info.si_signo = TARGET_SIGFPE; 82 info.si_errno = 0; 83 info.si_code = TARGET_FPE_FLTINV; 84 info._sifields._sigfault._addr = env->pc; 85 queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info); 86 break; 87 case EXCP_FEN: 88 /* No-op. Linux simply re-enables the FPU. */ 89 break; 90 case EXCP_CALL_PAL: 91 switch (env->error_code) { 92 case 0x80: 93 /* BPT */ 94 info.si_signo = TARGET_SIGTRAP; 95 info.si_errno = 0; 96 info.si_code = TARGET_TRAP_BRKPT; 97 info._sifields._sigfault._addr = env->pc; 98 queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info); 99 break; 100 case 0x81: 101 /* BUGCHK */ 102 info.si_signo = TARGET_SIGTRAP; 103 info.si_errno = 0; 104 info.si_code = 0; 105 info._sifields._sigfault._addr = env->pc; 106 queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info); 107 break; 108 case 0x83: 109 /* CALLSYS */ 110 trapnr = env->ir[IR_V0]; 111 sysret = do_syscall(env, trapnr, 112 env->ir[IR_A0], env->ir[IR_A1], 113 env->ir[IR_A2], env->ir[IR_A3], 114 env->ir[IR_A4], env->ir[IR_A5], 115 0, 0); 116 if (sysret == -TARGET_ERESTARTSYS) { 117 env->pc -= 4; 118 break; 119 } 120 if (sysret == -TARGET_QEMU_ESIGRETURN) { 121 break; 122 } 123 /* Syscall writes 0 to V0 to bypass error check, similar 124 to how this is handled internal to Linux kernel. 125 (Ab)use trapnr temporarily as boolean indicating error. */ 126 trapnr = (env->ir[IR_V0] != 0 && sysret < 0); 127 env->ir[IR_V0] = (trapnr ? -sysret : sysret); 128 env->ir[IR_A3] = trapnr; 129 break; 130 case 0x86: 131 /* IMB */ 132 /* ??? We can probably elide the code using page_unprotect 133 that is checking for self-modifying code. Instead we 134 could simply call tb_flush here. Until we work out the 135 changes required to turn off the extra write protection, 136 this can be a no-op. */ 137 break; 138 case 0x9E: 139 /* RDUNIQUE */ 140 /* Handled in the translator for usermode. */ 141 abort(); 142 case 0x9F: 143 /* WRUNIQUE */ 144 /* Handled in the translator for usermode. */ 145 abort(); 146 case 0xAA: 147 /* GENTRAP */ 148 info.si_signo = TARGET_SIGFPE; 149 switch (env->ir[IR_A0]) { 150 case TARGET_GEN_INTOVF: 151 info.si_code = TARGET_FPE_INTOVF; 152 break; 153 case TARGET_GEN_INTDIV: 154 info.si_code = TARGET_FPE_INTDIV; 155 break; 156 case TARGET_GEN_FLTOVF: 157 info.si_code = TARGET_FPE_FLTOVF; 158 break; 159 case TARGET_GEN_FLTUND: 160 info.si_code = TARGET_FPE_FLTUND; 161 break; 162 case TARGET_GEN_FLTINV: 163 info.si_code = TARGET_FPE_FLTINV; 164 break; 165 case TARGET_GEN_FLTINE: 166 info.si_code = TARGET_FPE_FLTRES; 167 break; 168 case TARGET_GEN_ROPRAND: 169 info.si_code = 0; 170 break; 171 default: 172 info.si_signo = TARGET_SIGTRAP; 173 info.si_code = 0; 174 break; 175 } 176 info.si_errno = 0; 177 info._sifields._sigfault._addr = env->pc; 178 queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info); 179 break; 180 default: 181 goto do_sigill; 182 } 183 break; 184 case EXCP_DEBUG: 185 info.si_signo = TARGET_SIGTRAP; 186 info.si_errno = 0; 187 info.si_code = TARGET_TRAP_BRKPT; 188 queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info); 189 break; 190 case EXCP_INTERRUPT: 191 /* Just indicate that signals should be handled asap. */ 192 break; 193 case EXCP_ATOMIC: 194 cpu_exec_step_atomic(cs); 195 arch_interrupt = false; 196 break; 197 default: 198 fprintf(stderr, "Unhandled trap: 0x%x\n", trapnr); 199 cpu_dump_state(cs, stderr, 0); 200 exit(EXIT_FAILURE); 201 } 202 process_pending_signals (env); 203 204 /* Most of the traps imply a transition through PALcode, which 205 implies an REI instruction has been executed. Which means 206 that RX and LOCK_ADDR should be cleared. But there are a 207 few exceptions for traps internal to QEMU. */ 208 if (arch_interrupt) { 209 env->flags &= ~ENV_FLAG_RX_FLAG; 210 env->lock_addr = -1; 211 } 212 } 213 } 214 215 void target_cpu_copy_regs(CPUArchState *env, struct target_pt_regs *regs) 216 { 217 int i; 218 219 for(i = 0; i < 28; i++) { 220 env->ir[i] = ((abi_ulong *)regs)[i]; 221 } 222 env->ir[IR_SP] = regs->usp; 223 env->pc = regs->pc; 224 } 225