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