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 == -QEMU_ERESTARTSYS) { 84 env->pc -= 2; 85 } else if (ret != -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_DEBUG: 94 info.si_signo = TARGET_SIGTRAP; 95 info.si_errno = 0; 96 info.si_code = TARGET_TRAP_BRKPT; 97 queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info); 98 break; 99 case EXCP_ATOMIC: 100 cpu_exec_step_atomic(cs); 101 break; 102 default: 103 EXCP_DUMP(env, "qemu: unhandled CPU exception 0x%x - aborting\n", trapnr); 104 abort(); 105 } 106 process_pending_signals(env); 107 } 108 } 109 110 void target_cpu_copy_regs(CPUArchState *env, struct target_pt_regs *regs) 111 { 112 CPUState *cpu = env_cpu(env); 113 TaskState *ts = cpu->opaque; 114 struct image_info *info = ts->info; 115 116 env->pc = regs->pc; 117 env->dregs[0] = regs->d0; 118 env->dregs[1] = regs->d1; 119 env->dregs[2] = regs->d2; 120 env->dregs[3] = regs->d3; 121 env->dregs[4] = regs->d4; 122 env->dregs[5] = regs->d5; 123 env->dregs[6] = regs->d6; 124 env->dregs[7] = regs->d7; 125 env->aregs[0] = regs->a0; 126 env->aregs[1] = regs->a1; 127 env->aregs[2] = regs->a2; 128 env->aregs[3] = regs->a3; 129 env->aregs[4] = regs->a4; 130 env->aregs[5] = regs->a5; 131 env->aregs[6] = regs->a6; 132 env->aregs[7] = regs->usp; 133 env->sr = regs->sr; 134 135 ts->stack_base = info->start_stack; 136 ts->heap_base = info->brk; 137 /* This will be filled in on the first SYS_HEAPINFO call. */ 138 ts->heap_limit = 0; 139 } 140