cpu_loop.c (3129B)
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 "user-internals.h" 23 #include "cpu_loop-common.h" 24 #include "signal-common.h" 25 26 void cpu_loop(CPUOpenRISCState *env) 27 { 28 CPUState *cs = env_cpu(env); 29 int trapnr; 30 abi_long ret; 31 32 for (;;) { 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 EXCP_SYSCALL: 40 env->pc += 4; /* 0xc00; */ 41 ret = do_syscall(env, 42 cpu_get_gpr(env, 11), /* return value */ 43 cpu_get_gpr(env, 3), /* r3 - r7 are params */ 44 cpu_get_gpr(env, 4), 45 cpu_get_gpr(env, 5), 46 cpu_get_gpr(env, 6), 47 cpu_get_gpr(env, 7), 48 cpu_get_gpr(env, 8), 0, 0); 49 if (ret == -QEMU_ERESTARTSYS) { 50 env->pc -= 4; 51 } else if (ret != -QEMU_ESIGRETURN) { 52 cpu_set_gpr(env, 11, ret); 53 } 54 break; 55 case EXCP_ALIGN: 56 force_sig_fault(TARGET_SIGBUS, TARGET_BUS_ADRALN, env->eear); 57 break; 58 case EXCP_ILLEGAL: 59 force_sig_fault(TARGET_SIGILL, TARGET_ILL_ILLOPC, env->pc); 60 break; 61 case EXCP_INTERRUPT: 62 /* We processed the pending cpu work above. */ 63 break; 64 case EXCP_DEBUG: 65 force_sig_fault(TARGET_SIGTRAP, TARGET_TRAP_BRKPT, env->pc); 66 break; 67 case EXCP_ATOMIC: 68 cpu_exec_step_atomic(cs); 69 break; 70 case EXCP_RANGE: 71 /* Requires SR.OVE set, which linux-user won't do. */ 72 cpu_abort(cs, "Unexpected RANGE exception"); 73 case EXCP_FPE: 74 /* 75 * Requires FPSCR.FPEE set. Writes to FPSCR from usermode not 76 * yet enabled in kernel ABI, so linux-user does not either. 77 */ 78 cpu_abort(cs, "Unexpected FPE exception"); 79 default: 80 g_assert_not_reached(); 81 } 82 process_pending_signals(env); 83 } 84 } 85 86 void target_cpu_copy_regs(CPUArchState *env, struct target_pt_regs *regs) 87 { 88 int i; 89 90 for (i = 0; i < 32; i++) { 91 cpu_set_gpr(env, i, regs->gpr[i]); 92 } 93 env->pc = regs->pc; 94 cpu_set_sr(env, regs->sr); 95 }