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.h" 22 #include "cpu_loop-common.h" 23 24 void cpu_loop(CPUM68KState *env) 25 { 26 CPUState *cs = CPU(m68k_env_get_cpu(env)); 27 int trapnr; 28 unsigned int n; 29 target_siginfo_t info; 30 TaskState *ts = cs->opaque; 31 32 for(;;) { 33 cpu_exec_start(cs); 34 trapnr = cpu_exec(cs); 35 cpu_exec_end(cs); 36 process_queued_cpu_work(cs); 37 38 switch(trapnr) { 39 case EXCP_ILLEGAL: 40 { 41 if (ts->sim_syscalls) { 42 uint16_t nr; 43 get_user_u16(nr, env->pc + 2); 44 env->pc += 4; 45 do_m68k_simcall(env, nr); 46 } else { 47 goto do_sigill; 48 } 49 } 50 break; 51 case EXCP_HALT_INSN: 52 /* Semihosing syscall. */ 53 env->pc += 4; 54 do_m68k_semihosting(env, env->dregs[0]); 55 break; 56 case EXCP_LINEA: 57 case EXCP_LINEF: 58 do_sigill: 59 info.si_signo = TARGET_SIGILL; 60 info.si_errno = 0; 61 info.si_code = TARGET_ILL_ILLOPN; 62 info._sifields._sigfault._addr = env->pc; 63 queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info); 64 break; 65 case EXCP_CHK: 66 info.si_signo = TARGET_SIGFPE; 67 info.si_errno = 0; 68 info.si_code = TARGET_FPE_INTOVF; 69 info._sifields._sigfault._addr = env->pc; 70 queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info); 71 break; 72 case EXCP_DIV0: 73 info.si_signo = TARGET_SIGFPE; 74 info.si_errno = 0; 75 info.si_code = TARGET_FPE_INTDIV; 76 info._sifields._sigfault._addr = env->pc; 77 queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info); 78 break; 79 case EXCP_TRAP0: 80 { 81 abi_long ret; 82 ts->sim_syscalls = 0; 83 n = env->dregs[0]; 84 env->pc += 2; 85 ret = do_syscall(env, 86 n, 87 env->dregs[1], 88 env->dregs[2], 89 env->dregs[3], 90 env->dregs[4], 91 env->dregs[5], 92 env->aregs[0], 93 0, 0); 94 if (ret == -TARGET_ERESTARTSYS) { 95 env->pc -= 2; 96 } else if (ret != -TARGET_QEMU_ESIGRETURN) { 97 env->dregs[0] = ret; 98 } 99 } 100 break; 101 case EXCP_INTERRUPT: 102 /* just indicate that signals should be handled asap */ 103 break; 104 case EXCP_ACCESS: 105 { 106 info.si_signo = TARGET_SIGSEGV; 107 info.si_errno = 0; 108 /* XXX: check env->error_code */ 109 info.si_code = TARGET_SEGV_MAPERR; 110 info._sifields._sigfault._addr = env->mmu.ar; 111 queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info); 112 } 113 break; 114 case EXCP_DEBUG: 115 info.si_signo = TARGET_SIGTRAP; 116 info.si_errno = 0; 117 info.si_code = TARGET_TRAP_BRKPT; 118 queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info); 119 break; 120 case EXCP_ATOMIC: 121 cpu_exec_step_atomic(cs); 122 break; 123 default: 124 EXCP_DUMP(env, "qemu: unhandled CPU exception 0x%x - aborting\n", trapnr); 125 abort(); 126 } 127 process_pending_signals(env); 128 } 129 } 130 131 void target_cpu_copy_regs(CPUArchState *env, struct target_pt_regs *regs) 132 { 133 CPUState *cpu = ENV_GET_CPU(env); 134 TaskState *ts = cpu->opaque; 135 struct image_info *info = ts->info; 136 137 env->pc = regs->pc; 138 env->dregs[0] = regs->d0; 139 env->dregs[1] = regs->d1; 140 env->dregs[2] = regs->d2; 141 env->dregs[3] = regs->d3; 142 env->dregs[4] = regs->d4; 143 env->dregs[5] = regs->d5; 144 env->dregs[6] = regs->d6; 145 env->dregs[7] = regs->d7; 146 env->aregs[0] = regs->a0; 147 env->aregs[1] = regs->a1; 148 env->aregs[2] = regs->a2; 149 env->aregs[3] = regs->a3; 150 env->aregs[4] = regs->a4; 151 env->aregs[5] = regs->a5; 152 env->aregs[6] = regs->a6; 153 env->aregs[7] = regs->usp; 154 env->sr = regs->sr; 155 156 ts->sim_syscalls = 1; 157 ts->stack_base = info->start_stack; 158 ts->heap_base = info->brk; 159 /* This will be filled in on the first SYS_HEAPINFO call. */ 160 ts->heap_limit = 0; 161 } 162