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 "cpu_loop-common.h" 23 24 void cpu_loop(CPUSH4State *env) 25 { 26 CPUState *cs = CPU(sh_env_get_cpu(env)); 27 int trapnr, ret; 28 target_siginfo_t info; 29 30 while (1) { 31 bool arch_interrupt = true; 32 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 0x160: 40 env->pc += 2; 41 ret = do_syscall(env, 42 env->gregs[3], 43 env->gregs[4], 44 env->gregs[5], 45 env->gregs[6], 46 env->gregs[7], 47 env->gregs[0], 48 env->gregs[1], 49 0, 0); 50 if (ret == -TARGET_ERESTARTSYS) { 51 env->pc -= 2; 52 } else if (ret != -TARGET_QEMU_ESIGRETURN) { 53 env->gregs[0] = ret; 54 } 55 break; 56 case EXCP_INTERRUPT: 57 /* just indicate that signals should be handled asap */ 58 break; 59 case EXCP_DEBUG: 60 { 61 int sig; 62 63 sig = gdb_handlesig(cs, TARGET_SIGTRAP); 64 if (sig) { 65 info.si_signo = sig; 66 info.si_errno = 0; 67 info.si_code = TARGET_TRAP_BRKPT; 68 queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info); 69 } else { 70 arch_interrupt = false; 71 } 72 } 73 break; 74 case 0xa0: 75 case 0xc0: 76 info.si_signo = TARGET_SIGSEGV; 77 info.si_errno = 0; 78 info.si_code = TARGET_SEGV_MAPERR; 79 info._sifields._sigfault._addr = env->tea; 80 queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info); 81 break; 82 case EXCP_ATOMIC: 83 cpu_exec_step_atomic(cs); 84 arch_interrupt = false; 85 break; 86 default: 87 printf ("Unhandled trap: 0x%x\n", trapnr); 88 cpu_dump_state(cs, stderr, fprintf, 0); 89 exit(EXIT_FAILURE); 90 } 91 process_pending_signals (env); 92 93 /* Most of the traps imply an exception or interrupt, which 94 implies an REI instruction has been executed. Which means 95 that LDST (aka LOK_ADDR) should be cleared. But there are 96 a few exceptions for traps internal to QEMU. */ 97 if (arch_interrupt) { 98 env->lock_addr = -1; 99 } 100 } 101 } 102 103 void target_cpu_copy_regs(CPUArchState *env, struct target_pt_regs *regs) 104 { 105 int i; 106 107 for(i = 0; i < 16; i++) { 108 env->gregs[i] = regs->regs[i]; 109 } 110 env->pc = regs->pc; 111 } 112