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.h" 23 #include "cpu_loop-common.h" 24 #include "internal.h" 25 26 void cpu_loop(CPUHexagonState *env) 27 { 28 CPUState *cs = CPU(hexagon_env_get_cpu(env)); 29 int trapnr, signum, sigcode; 30 target_ulong sigaddr; 31 target_ulong syscallnum; 32 target_ulong ret; 33 34 for (;;) { 35 cpu_exec_start(cs); 36 trapnr = cpu_exec(cs); 37 cpu_exec_end(cs); 38 process_queued_cpu_work(cs); 39 40 signum = 0; 41 sigcode = 0; 42 sigaddr = 0; 43 44 switch (trapnr) { 45 case EXCP_INTERRUPT: 46 /* just indicate that signals should be handled asap */ 47 break; 48 case HEX_EXCP_TRAP0: 49 syscallnum = env->gpr[6]; 50 env->gpr[HEX_REG_PC] += 4; 51 ret = do_syscall(env, 52 syscallnum, 53 env->gpr[0], 54 env->gpr[1], 55 env->gpr[2], 56 env->gpr[3], 57 env->gpr[4], 58 env->gpr[5], 59 0, 0); 60 if (ret == -TARGET_ERESTARTSYS) { 61 env->gpr[HEX_REG_PC] -= 4; 62 } else if (ret != -TARGET_QEMU_ESIGRETURN) { 63 env->gpr[0] = ret; 64 } 65 break; 66 case HEX_EXCP_FETCH_NO_UPAGE: 67 case HEX_EXCP_PRIV_NO_UREAD: 68 case HEX_EXCP_PRIV_NO_UWRITE: 69 signum = TARGET_SIGSEGV; 70 sigcode = TARGET_SEGV_MAPERR; 71 break; 72 case EXCP_ATOMIC: 73 cpu_exec_step_atomic(cs); 74 break; 75 default: 76 EXCP_DUMP(env, "\nqemu: unhandled CPU exception %#x - aborting\n", 77 trapnr); 78 exit(EXIT_FAILURE); 79 } 80 81 if (signum) { 82 target_siginfo_t info = { 83 .si_signo = signum, 84 .si_errno = 0, 85 .si_code = sigcode, 86 ._sifields._sigfault._addr = sigaddr 87 }; 88 queue_signal(env, info.si_signo, QEMU_SI_KILL, &info); 89 } 90 91 process_pending_signals(env); 92 } 93 } 94 95 void target_cpu_copy_regs(CPUArchState *env, struct target_pt_regs *regs) 96 { 97 env->gpr[HEX_REG_PC] = regs->sepc; 98 env->gpr[HEX_REG_SP] = regs->sp; 99 env->gpr[HEX_REG_USR] = 0x56000; 100 } 101