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 case EXCP_TRAPCC: 51 force_sig_fault(TARGET_SIGFPE, TARGET_FPE_INTOVF, env->mmu.ar); 52 break; 53 case EXCP_DIV0: 54 force_sig_fault(TARGET_SIGFPE, TARGET_FPE_INTDIV, env->mmu.ar); 55 break; 56 case EXCP_TRACE: 57 force_sig_fault(TARGET_SIGTRAP, TARGET_TRAP_TRACE, env->mmu.ar); 58 break; 59 case EXCP_TRAP0: 60 { 61 abi_long ret; 62 n = env->dregs[0]; 63 ret = do_syscall(env, 64 n, 65 env->dregs[1], 66 env->dregs[2], 67 env->dregs[3], 68 env->dregs[4], 69 env->dregs[5], 70 env->aregs[0], 71 0, 0); 72 if (ret == -QEMU_ERESTARTSYS) { 73 env->pc -= 2; 74 } else if (ret != -QEMU_ESIGRETURN) { 75 env->dregs[0] = ret; 76 } 77 } 78 break; 79 case EXCP_INTERRUPT: 80 /* just indicate that signals should be handled asap */ 81 break; 82 case EXCP_TRAP0 + 1 ... EXCP_TRAP0 + 14: 83 force_sig_fault(TARGET_SIGILL, TARGET_ILL_ILLTRP, env->pc); 84 break; 85 case EXCP_DEBUG: 86 case EXCP_TRAP15: 87 force_sig_fault(TARGET_SIGTRAP, TARGET_TRAP_BRKPT, env->pc); 88 break; 89 case EXCP_ATOMIC: 90 cpu_exec_step_atomic(cs); 91 break; 92 default: 93 EXCP_DUMP(env, "qemu: unhandled CPU exception 0x%x - aborting\n", trapnr); 94 abort(); 95 } 96 process_pending_signals(env); 97 } 98 } 99 100 void target_cpu_copy_regs(CPUArchState *env, struct target_pt_regs *regs) 101 { 102 CPUState *cpu = env_cpu(env); 103 TaskState *ts = cpu->opaque; 104 struct image_info *info = ts->info; 105 106 env->pc = regs->pc; 107 env->dregs[0] = regs->d0; 108 env->dregs[1] = regs->d1; 109 env->dregs[2] = regs->d2; 110 env->dregs[3] = regs->d3; 111 env->dregs[4] = regs->d4; 112 env->dregs[5] = regs->d5; 113 env->dregs[6] = regs->d6; 114 env->dregs[7] = regs->d7; 115 env->aregs[0] = regs->a0; 116 env->aregs[1] = regs->a1; 117 env->aregs[2] = regs->a2; 118 env->aregs[3] = regs->a3; 119 env->aregs[4] = regs->a4; 120 env->aregs[5] = regs->a5; 121 env->aregs[6] = regs->a6; 122 env->aregs[7] = regs->usp; 123 env->sr = regs->sr; 124 125 ts->stack_base = info->start_stack; 126 ts->heap_base = info->brk; 127 /* This will be filled in on the first SYS_HEAPINFO call. */ 128 ts->heap_limit = 0; 129 } 130