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 25 void cpu_loop(CPUM68KState *env) 26 { 27 CPUState *cs = env_cpu(env); 28 int trapnr; 29 unsigned int n; 30 target_siginfo_t info; 31 TaskState *ts = cs->opaque; 32 33 for(;;) { 34 cpu_exec_start(cs); 35 trapnr = cpu_exec(cs); 36 cpu_exec_end(cs); 37 process_queued_cpu_work(cs); 38 39 switch(trapnr) { 40 case EXCP_ILLEGAL: 41 { 42 if (ts->sim_syscalls) { 43 uint16_t nr; 44 get_user_u16(nr, env->pc + 2); 45 env->pc += 4; 46 do_m68k_simcall(env, nr); 47 } else { 48 goto do_sigill; 49 } 50 } 51 break; 52 case EXCP_HALT_INSN: 53 /* Semihosing syscall. */ 54 env->pc += 4; 55 do_m68k_semihosting(env, env->dregs[0]); 56 break; 57 case EXCP_LINEA: 58 case EXCP_LINEF: 59 do_sigill: 60 info.si_signo = TARGET_SIGILL; 61 info.si_errno = 0; 62 info.si_code = TARGET_ILL_ILLOPN; 63 info._sifields._sigfault._addr = env->pc; 64 queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info); 65 break; 66 case EXCP_CHK: 67 info.si_signo = TARGET_SIGFPE; 68 info.si_errno = 0; 69 info.si_code = TARGET_FPE_INTOVF; 70 info._sifields._sigfault._addr = env->pc; 71 queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info); 72 break; 73 case EXCP_DIV0: 74 info.si_signo = TARGET_SIGFPE; 75 info.si_errno = 0; 76 info.si_code = TARGET_FPE_INTDIV; 77 info._sifields._sigfault._addr = env->pc; 78 queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info); 79 break; 80 case EXCP_TRAP0: 81 { 82 abi_long ret; 83 ts->sim_syscalls = 0; 84 n = env->dregs[0]; 85 env->pc += 2; 86 ret = do_syscall(env, 87 n, 88 env->dregs[1], 89 env->dregs[2], 90 env->dregs[3], 91 env->dregs[4], 92 env->dregs[5], 93 env->aregs[0], 94 0, 0); 95 if (ret == -TARGET_ERESTARTSYS) { 96 env->pc -= 2; 97 } else if (ret != -TARGET_QEMU_ESIGRETURN) { 98 env->dregs[0] = ret; 99 } 100 } 101 break; 102 case EXCP_INTERRUPT: 103 /* just indicate that signals should be handled asap */ 104 break; 105 case EXCP_ACCESS: 106 { 107 info.si_signo = TARGET_SIGSEGV; 108 info.si_errno = 0; 109 /* XXX: check env->error_code */ 110 info.si_code = TARGET_SEGV_MAPERR; 111 info._sifields._sigfault._addr = env->mmu.ar; 112 queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info); 113 } 114 break; 115 case EXCP_DEBUG: 116 info.si_signo = TARGET_SIGTRAP; 117 info.si_errno = 0; 118 info.si_code = TARGET_TRAP_BRKPT; 119 queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info); 120 break; 121 case EXCP_ATOMIC: 122 cpu_exec_step_atomic(cs); 123 break; 124 default: 125 EXCP_DUMP(env, "qemu: unhandled CPU exception 0x%x - aborting\n", trapnr); 126 abort(); 127 } 128 process_pending_signals(env); 129 } 130 } 131 132 void target_cpu_copy_regs(CPUArchState *env, struct target_pt_regs *regs) 133 { 134 CPUState *cpu = env_cpu(env); 135 TaskState *ts = cpu->opaque; 136 struct image_info *info = ts->info; 137 138 env->pc = regs->pc; 139 env->dregs[0] = regs->d0; 140 env->dregs[1] = regs->d1; 141 env->dregs[2] = regs->d2; 142 env->dregs[3] = regs->d3; 143 env->dregs[4] = regs->d4; 144 env->dregs[5] = regs->d5; 145 env->dregs[6] = regs->d6; 146 env->dregs[7] = regs->d7; 147 env->aregs[0] = regs->a0; 148 env->aregs[1] = regs->a1; 149 env->aregs[2] = regs->a2; 150 env->aregs[3] = regs->a3; 151 env->aregs[4] = regs->a4; 152 env->aregs[5] = regs->a5; 153 env->aregs[6] = regs->a6; 154 env->aregs[7] = regs->usp; 155 env->sr = regs->sr; 156 157 ts->sim_syscalls = 1; 158 ts->stack_base = info->start_stack; 159 ts->heap_base = info->brk; 160 /* This will be filled in on the first SYS_HEAPINFO call. */ 161 ts->heap_limit = 0; 162 } 163