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(CPUSH4State *env) 28 { 29 CPUState *cs = env_cpu(env); 30 int trapnr, ret; 31 32 while (1) { 33 bool arch_interrupt = true; 34 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 0x160: 42 env->pc += 2; 43 ret = do_syscall(env, 44 env->gregs[3], 45 env->gregs[4], 46 env->gregs[5], 47 env->gregs[6], 48 env->gregs[7], 49 env->gregs[0], 50 env->gregs[1], 51 0, 0); 52 if (ret == -QEMU_ERESTARTSYS) { 53 env->pc -= 2; 54 } else if (ret != -QEMU_ESIGRETURN) { 55 env->gregs[0] = ret; 56 } 57 break; 58 case EXCP_INTERRUPT: 59 /* just indicate that signals should be handled asap */ 60 break; 61 case EXCP_DEBUG: 62 force_sig_fault(TARGET_SIGTRAP, TARGET_TRAP_BRKPT, env->pc); 63 break; 64 case EXCP_ATOMIC: 65 cpu_exec_step_atomic(cs); 66 arch_interrupt = false; 67 break; 68 default: 69 fprintf(stderr, "Unhandled trap: 0x%x\n", trapnr); 70 cpu_dump_state(cs, stderr, 0); 71 exit(EXIT_FAILURE); 72 } 73 process_pending_signals (env); 74 75 /* Most of the traps imply an exception or interrupt, which 76 implies an REI instruction has been executed. Which means 77 that LDST (aka LOK_ADDR) should be cleared. But there are 78 a few exceptions for traps internal to QEMU. */ 79 if (arch_interrupt) { 80 env->lock_addr = -1; 81 } 82 } 83 } 84 85 void target_cpu_copy_regs(CPUArchState *env, struct target_pt_regs *regs) 86 { 87 int i; 88 89 for(i = 0; i < 16; i++) { 90 env->gregs[i] = regs->regs[i]; 91 } 92 env->pc = regs->pc; 93 } 94