cpu_loop.c (2868B)
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(CPUSH4State *env) 27 { 28 CPUState *cs = env_cpu(env); 29 int trapnr, ret; 30 31 while (1) { 32 bool arch_interrupt = true; 33 34 cpu_exec_start(cs); 35 trapnr = cpu_exec(cs); 36 cpu_exec_end(cs); 37 process_queued_cpu_work(cs); 38 39 switch (trapnr) { 40 case 0x160: 41 env->pc += 2; 42 ret = do_syscall(env, 43 env->gregs[3], 44 env->gregs[4], 45 env->gregs[5], 46 env->gregs[6], 47 env->gregs[7], 48 env->gregs[0], 49 env->gregs[1], 50 0, 0); 51 if (ret == -QEMU_ERESTARTSYS) { 52 env->pc -= 2; 53 } else if (ret != -QEMU_ESIGRETURN) { 54 env->gregs[0] = ret; 55 } 56 break; 57 case EXCP_INTERRUPT: 58 /* just indicate that signals should be handled asap */ 59 break; 60 case EXCP_DEBUG: 61 force_sig_fault(TARGET_SIGTRAP, TARGET_TRAP_BRKPT, env->pc); 62 break; 63 case EXCP_ATOMIC: 64 cpu_exec_step_atomic(cs); 65 arch_interrupt = false; 66 break; 67 default: 68 fprintf(stderr, "Unhandled trap: 0x%x\n", trapnr); 69 cpu_dump_state(cs, stderr, 0); 70 exit(EXIT_FAILURE); 71 } 72 process_pending_signals (env); 73 74 /* Most of the traps imply an exception or interrupt, which 75 implies an REI instruction has been executed. Which means 76 that LDST (aka LOK_ADDR) should be cleared. But there are 77 a few exceptions for traps internal to QEMU. */ 78 if (arch_interrupt) { 79 env->lock_addr = -1; 80 } 81 } 82 } 83 84 void target_cpu_copy_regs(CPUArchState *env, struct target_pt_regs *regs) 85 { 86 int i; 87 88 for(i = 0; i < 16; i++) { 89 env->gregs[i] = regs->regs[i]; 90 } 91 env->pc = regs->pc; 92 }