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 "user-internals.h" 23 #include "cpu_loop-common.h" 24 #include "signal-common.h" 25 26 void cpu_loop(CPUM68KState *env) 27 { 28 CPUState *cs = env_cpu(env); 29 int trapnr; 30 unsigned int n; 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 force_sig_fault(TARGET_SIGILL, TARGET_ILL_ILLOPN, env->pc); 48 break; 49 case EXCP_CHK: 50 force_sig_fault(TARGET_SIGFPE, TARGET_FPE_INTOVF, env->pc); 51 break; 52 case EXCP_DIV0: 53 force_sig_fault(TARGET_SIGFPE, TARGET_FPE_INTDIV, env->pc); 54 break; 55 case EXCP_TRAP0: 56 { 57 abi_long ret; 58 n = env->dregs[0]; 59 env->pc += 2; 60 ret = do_syscall(env, 61 n, 62 env->dregs[1], 63 env->dregs[2], 64 env->dregs[3], 65 env->dregs[4], 66 env->dregs[5], 67 env->aregs[0], 68 0, 0); 69 if (ret == -QEMU_ERESTARTSYS) { 70 env->pc -= 2; 71 } else if (ret != -QEMU_ESIGRETURN) { 72 env->dregs[0] = ret; 73 } 74 } 75 break; 76 case EXCP_INTERRUPT: 77 /* just indicate that signals should be handled asap */ 78 break; 79 case EXCP_DEBUG: 80 force_sig_fault(TARGET_SIGTRAP, TARGET_TRAP_BRKPT, env->pc); 81 break; 82 case EXCP_ATOMIC: 83 cpu_exec_step_atomic(cs); 84 break; 85 default: 86 EXCP_DUMP(env, "qemu: unhandled CPU exception 0x%x - aborting\n", trapnr); 87 abort(); 88 } 89 process_pending_signals(env); 90 } 91 } 92 93 void target_cpu_copy_regs(CPUArchState *env, struct target_pt_regs *regs) 94 { 95 CPUState *cpu = env_cpu(env); 96 TaskState *ts = cpu->opaque; 97 struct image_info *info = ts->info; 98 99 env->pc = regs->pc; 100 env->dregs[0] = regs->d0; 101 env->dregs[1] = regs->d1; 102 env->dregs[2] = regs->d2; 103 env->dregs[3] = regs->d3; 104 env->dregs[4] = regs->d4; 105 env->dregs[5] = regs->d5; 106 env->dregs[6] = regs->d6; 107 env->dregs[7] = regs->d7; 108 env->aregs[0] = regs->a0; 109 env->aregs[1] = regs->a1; 110 env->aregs[2] = regs->a2; 111 env->aregs[3] = regs->a3; 112 env->aregs[4] = regs->a4; 113 env->aregs[5] = regs->a5; 114 env->aregs[6] = regs->a6; 115 env->aregs[7] = regs->usp; 116 env->sr = regs->sr; 117 118 ts->stack_base = info->start_stack; 119 ts->heap_base = info->brk; 120 /* This will be filled in on the first SYS_HEAPINFO call. */ 121 ts->heap_limit = 0; 122 } 123