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 target_siginfo_t info; 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 switch (trapnr) { 41 case EXCP_SYSCALL: 42 env->pc += 4; /* 0xc00; */ 43 ret = do_syscall(env, 44 cpu_get_gpr(env, 11), /* return value */ 45 cpu_get_gpr(env, 3), /* r3 - r7 are params */ 46 cpu_get_gpr(env, 4), 47 cpu_get_gpr(env, 5), 48 cpu_get_gpr(env, 6), 49 cpu_get_gpr(env, 7), 50 cpu_get_gpr(env, 8), 0, 0); 51 if (ret == -TARGET_ERESTARTSYS) { 52 env->pc -= 4; 53 } else if (ret != -TARGET_QEMU_ESIGRETURN) { 54 cpu_set_gpr(env, 11, ret); 55 } 56 break; 57 case EXCP_ALIGN: 58 info.si_signo = TARGET_SIGBUS; 59 info.si_errno = 0; 60 info.si_code = TARGET_BUS_ADRALN; 61 info._sifields._sigfault._addr = env->pc; 62 queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info); 63 break; 64 case EXCP_ILLEGAL: 65 info.si_signo = TARGET_SIGILL; 66 info.si_errno = 0; 67 info.si_code = TARGET_ILL_ILLOPC; 68 info._sifields._sigfault._addr = env->pc; 69 queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info); 70 break; 71 case EXCP_INTERRUPT: 72 /* We processed the pending cpu work above. */ 73 break; 74 case EXCP_DEBUG: 75 info.si_signo = TARGET_SIGTRAP; 76 info.si_errno = 0; 77 info.si_code = TARGET_TRAP_BRKPT; 78 queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info); 79 break; 80 case EXCP_ATOMIC: 81 cpu_exec_step_atomic(cs); 82 break; 83 case EXCP_RANGE: 84 /* Requires SR.OVE set, which linux-user won't do. */ 85 cpu_abort(cs, "Unexpected RANGE exception"); 86 case EXCP_FPE: 87 /* 88 * Requires FPSCR.FPEE set. Writes to FPSCR from usermode not 89 * yet enabled in kernel ABI, so linux-user does not either. 90 */ 91 cpu_abort(cs, "Unexpected FPE exception"); 92 default: 93 g_assert_not_reached(); 94 } 95 process_pending_signals(env); 96 } 97 } 98 99 void target_cpu_copy_regs(CPUArchState *env, struct target_pt_regs *regs) 100 { 101 int i; 102 103 for (i = 0; i < 32; i++) { 104 cpu_set_gpr(env, i, regs->gpr[i]); 105 } 106 env->pc = regs->pc; 107 cpu_set_sr(env, regs->sr); 108 } 109