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