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(CPUOpenRISCState *env) 28 { 29 CPUState *cs = env_cpu(env); 30 int trapnr; 31 abi_long ret; 32 33 for (;;) { 34 cpu_exec_start(cs); 35 trapnr = cpu_exec(cs); 36 cpu_exec_end(cs); 37 process_queued_cpu_work(cs); 38 39 switch (trapnr) { 40 case EXCP_SYSCALL: 41 env->pc += 4; /* 0xc00; */ 42 ret = do_syscall(env, 43 cpu_get_gpr(env, 11), /* return value */ 44 cpu_get_gpr(env, 3), /* r3 - r7 are params */ 45 cpu_get_gpr(env, 4), 46 cpu_get_gpr(env, 5), 47 cpu_get_gpr(env, 6), 48 cpu_get_gpr(env, 7), 49 cpu_get_gpr(env, 8), 0, 0); 50 if (ret == -QEMU_ERESTARTSYS) { 51 env->pc -= 4; 52 } else if (ret != -QEMU_ESIGRETURN) { 53 cpu_set_gpr(env, 11, ret); 54 } 55 break; 56 case EXCP_ALIGN: 57 force_sig_fault(TARGET_SIGBUS, TARGET_BUS_ADRALN, env->eear); 58 break; 59 case EXCP_ILLEGAL: 60 force_sig_fault(TARGET_SIGILL, TARGET_ILL_ILLOPC, env->pc); 61 break; 62 case EXCP_INTERRUPT: 63 /* We processed the pending cpu work above. */ 64 break; 65 case EXCP_DEBUG: 66 force_sig_fault(TARGET_SIGTRAP, TARGET_TRAP_BRKPT, env->pc); 67 break; 68 case EXCP_ATOMIC: 69 cpu_exec_step_atomic(cs); 70 break; 71 case EXCP_RANGE: 72 /* Requires SR.OVE set, which linux-user won't do. */ 73 cpu_abort(cs, "Unexpected RANGE exception"); 74 case EXCP_FPE: 75 /* 76 * Requires FPSCR.FPEE set. Writes to FPSCR from usermode not 77 * yet enabled in kernel ABI, so linux-user does not either. 78 */ 79 cpu_abort(cs, "Unexpected FPE exception"); 80 default: 81 g_assert_not_reached(); 82 } 83 process_pending_signals(env); 84 } 85 } 86 87 void target_cpu_copy_regs(CPUArchState *env, struct target_pt_regs *regs) 88 { 89 int i; 90 91 for (i = 0; i < 32; i++) { 92 cpu_set_gpr(env, i, regs->gpr[i]); 93 } 94 env->pc = regs->pc; 95 cpu_set_sr(env, regs->sr); 96 } 97