1 /* 2 * qemu user cpu loop 3 * 4 * Copyright (c) 2003-2008 Fabrice Bellard 5 * Copyright(c) 2019-2021 Qualcomm Innovation Center, Inc. All Rights Reserved. 6 * 7 * This program is free software; you can redistribute it and/or modify 8 * it under the terms of the GNU General Public License as published by 9 * the Free Software Foundation; either version 2 of the License, or 10 * (at your option) any later version. 11 * 12 * This program is distributed in the hope that it will be useful, 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15 * GNU General Public License for more details. 16 * 17 * You should have received a copy of the GNU General Public License 18 * along with this program; if not, see <http://www.gnu.org/licenses/>. 19 */ 20 21 #include "qemu/osdep.h" 22 #include "qemu-common.h" 23 #include "qemu.h" 24 #include "user-internals.h" 25 #include "cpu_loop-common.h" 26 #include "signal-common.h" 27 #include "internal.h" 28 29 void cpu_loop(CPUHexagonState *env) 30 { 31 CPUState *cs = env_cpu(env); 32 int trapnr; 33 target_ulong syscallnum; 34 target_ulong ret; 35 36 for (;;) { 37 cpu_exec_start(cs); 38 trapnr = cpu_exec(cs); 39 cpu_exec_end(cs); 40 process_queued_cpu_work(cs); 41 42 switch (trapnr) { 43 case EXCP_INTERRUPT: 44 /* just indicate that signals should be handled asap */ 45 break; 46 case HEX_EXCP_TRAP0: 47 syscallnum = env->gpr[6]; 48 env->gpr[HEX_REG_PC] += 4; 49 ret = do_syscall(env, 50 syscallnum, 51 env->gpr[0], 52 env->gpr[1], 53 env->gpr[2], 54 env->gpr[3], 55 env->gpr[4], 56 env->gpr[5], 57 0, 0); 58 if (ret == -QEMU_ERESTARTSYS) { 59 env->gpr[HEX_REG_PC] -= 4; 60 } else if (ret != -QEMU_ESIGRETURN) { 61 env->gpr[0] = ret; 62 } 63 break; 64 case EXCP_ATOMIC: 65 cpu_exec_step_atomic(cs); 66 break; 67 default: 68 EXCP_DUMP(env, "\nqemu: unhandled CPU exception %#x - aborting\n", 69 trapnr); 70 exit(EXIT_FAILURE); 71 } 72 process_pending_signals(env); 73 } 74 } 75 76 void target_cpu_copy_regs(CPUArchState *env, struct target_pt_regs *regs) 77 { 78 env->gpr[HEX_REG_PC] = regs->sepc; 79 env->gpr[HEX_REG_SP] = regs->sp; 80 env->gpr[HEX_REG_USR] = 0x56000; 81 } 82