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 "user-internals.h" 24 #include "cpu_loop-common.h" 25 #include "signal-common.h" 26 #include "internal.h" 27 28 void cpu_loop(CPUHexagonState *env) 29 { 30 CPUState *cs = env_cpu(env); 31 int trapnr, signum, sigcode; 32 target_ulong sigaddr; 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 signum = 0; 43 sigcode = 0; 44 sigaddr = 0; 45 46 switch (trapnr) { 47 case EXCP_INTERRUPT: 48 /* just indicate that signals should be handled asap */ 49 break; 50 case HEX_EXCP_TRAP0: 51 syscallnum = env->gpr[6]; 52 env->gpr[HEX_REG_PC] += 4; 53 ret = do_syscall(env, 54 syscallnum, 55 env->gpr[0], 56 env->gpr[1], 57 env->gpr[2], 58 env->gpr[3], 59 env->gpr[4], 60 env->gpr[5], 61 0, 0); 62 if (ret == -TARGET_ERESTARTSYS) { 63 env->gpr[HEX_REG_PC] -= 4; 64 } else if (ret != -TARGET_QEMU_ESIGRETURN) { 65 env->gpr[0] = ret; 66 } 67 break; 68 case HEX_EXCP_FETCH_NO_UPAGE: 69 case HEX_EXCP_PRIV_NO_UREAD: 70 case HEX_EXCP_PRIV_NO_UWRITE: 71 signum = TARGET_SIGSEGV; 72 sigcode = TARGET_SEGV_MAPERR; 73 break; 74 case EXCP_ATOMIC: 75 cpu_exec_step_atomic(cs); 76 break; 77 default: 78 EXCP_DUMP(env, "\nqemu: unhandled CPU exception %#x - aborting\n", 79 trapnr); 80 exit(EXIT_FAILURE); 81 } 82 83 if (signum) { 84 target_siginfo_t info = { 85 .si_signo = signum, 86 .si_errno = 0, 87 .si_code = sigcode, 88 ._sifields._sigfault._addr = sigaddr 89 }; 90 queue_signal(env, info.si_signo, QEMU_SI_KILL, &info); 91 } 92 93 process_pending_signals(env); 94 } 95 } 96 97 void target_cpu_copy_regs(CPUArchState *env, struct target_pt_regs *regs) 98 { 99 env->gpr[HEX_REG_PC] = regs->sepc; 100 env->gpr[HEX_REG_SP] = regs->sp; 101 env->gpr[HEX_REG_USR] = 0x56000; 102 } 103