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_ILLEGAL: 40 case EXCP_LINEA: 41 case EXCP_LINEF: 42 force_sig_fault(TARGET_SIGILL, TARGET_ILL_ILLOPN, env->pc); 43 break; 44 case EXCP_CHK: 45 case EXCP_TRAPCC: 46 force_sig_fault(TARGET_SIGFPE, TARGET_FPE_INTOVF, env->mmu.ar); 47 break; 48 case EXCP_DIV0: 49 force_sig_fault(TARGET_SIGFPE, TARGET_FPE_INTDIV, env->mmu.ar); 50 break; 51 case EXCP_TRACE: 52 force_sig_fault(TARGET_SIGTRAP, TARGET_TRAP_TRACE, env->mmu.ar); 53 break; 54 case EXCP_TRAP0: 55 { 56 abi_long ret; 57 n = env->dregs[0]; 58 ret = do_syscall(env, 59 n, 60 env->dregs[1], 61 env->dregs[2], 62 env->dregs[3], 63 env->dregs[4], 64 env->dregs[5], 65 env->aregs[0], 66 0, 0); 67 if (ret == -QEMU_ERESTARTSYS) { 68 env->pc -= 2; 69 } else if (ret != -QEMU_ESIGRETURN) { 70 env->dregs[0] = ret; 71 } 72 } 73 break; 74 case EXCP_INTERRUPT: 75 /* just indicate that signals should be handled asap */ 76 break; 77 case EXCP_TRAP0 + 1 ... EXCP_TRAP0 + 14: 78 force_sig_fault(TARGET_SIGILL, TARGET_ILL_ILLTRP, env->pc); 79 break; 80 case EXCP_DEBUG: 81 case EXCP_TRAP15: 82 force_sig_fault(TARGET_SIGTRAP, TARGET_TRAP_BRKPT, env->pc); 83 break; 84 case EXCP_ATOMIC: 85 cpu_exec_step_atomic(cs); 86 break; 87 default: 88 EXCP_DUMP(env, "qemu: unhandled CPU exception 0x%x - aborting\n", trapnr); 89 abort(); 90 } 91 process_pending_signals(env); 92 } 93 } 94 95 void target_cpu_copy_regs(CPUArchState *env, struct target_pt_regs *regs) 96 { 97 CPUState *cpu = env_cpu(env); 98 TaskState *ts = get_task_state(cpu); 99 struct image_info *info = ts->info; 100 101 env->pc = regs->pc; 102 env->dregs[0] = regs->d0; 103 env->dregs[1] = regs->d1; 104 env->dregs[2] = regs->d2; 105 env->dregs[3] = regs->d3; 106 env->dregs[4] = regs->d4; 107 env->dregs[5] = regs->d5; 108 env->dregs[6] = regs->d6; 109 env->dregs[7] = regs->d7; 110 env->aregs[0] = regs->a0; 111 env->aregs[1] = regs->a1; 112 env->aregs[2] = regs->a2; 113 env->aregs[3] = regs->a3; 114 env->aregs[4] = regs->a4; 115 env->aregs[5] = regs->a5; 116 env->aregs[6] = regs->a6; 117 env->aregs[7] = regs->usp; 118 env->sr = regs->sr; 119 120 ts->stack_base = info->start_stack; 121 ts->heap_base = info->brk; 122 /* This will be filled in on the first SYS_HEAPINFO call. */ 123 ts->heap_limit = 0; 124 } 125