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 target_siginfo_t info; 32 33 while (1) { 34 bool arch_interrupt = true; 35 36 cpu_exec_start(cs); 37 trapnr = cpu_exec(cs); 38 cpu_exec_end(cs); 39 process_queued_cpu_work(cs); 40 41 switch (trapnr) { 42 case 0x160: 43 env->pc += 2; 44 ret = do_syscall(env, 45 env->gregs[3], 46 env->gregs[4], 47 env->gregs[5], 48 env->gregs[6], 49 env->gregs[7], 50 env->gregs[0], 51 env->gregs[1], 52 0, 0); 53 if (ret == -TARGET_ERESTARTSYS) { 54 env->pc -= 2; 55 } else if (ret != -TARGET_QEMU_ESIGRETURN) { 56 env->gregs[0] = ret; 57 } 58 break; 59 case EXCP_INTERRUPT: 60 /* just indicate that signals should be handled asap */ 61 break; 62 case EXCP_DEBUG: 63 info.si_signo = TARGET_SIGTRAP; 64 info.si_errno = 0; 65 info.si_code = TARGET_TRAP_BRKPT; 66 queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info); 67 break; 68 case EXCP_ATOMIC: 69 cpu_exec_step_atomic(cs); 70 arch_interrupt = false; 71 break; 72 default: 73 fprintf(stderr, "Unhandled trap: 0x%x\n", trapnr); 74 cpu_dump_state(cs, stderr, 0); 75 exit(EXIT_FAILURE); 76 } 77 process_pending_signals (env); 78 79 /* Most of the traps imply an exception or interrupt, which 80 implies an REI instruction has been executed. Which means 81 that LDST (aka LOK_ADDR) should be cleared. But there are 82 a few exceptions for traps internal to QEMU. */ 83 if (arch_interrupt) { 84 env->lock_addr = -1; 85 } 86 } 87 } 88 89 void target_cpu_copy_regs(CPUArchState *env, struct target_pt_regs *regs) 90 { 91 int i; 92 93 for(i = 0; i < 16; i++) { 94 env->gregs[i] = regs->regs[i]; 95 } 96 env->pc = regs->pc; 97 } 98