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(CPUMBState *env) 28 { 29 CPUState *cs = env_cpu(env); 30 int trapnr, ret; 31 target_siginfo_t info; 32 33 while (1) { 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_INTERRUPT: 41 /* just indicate that signals should be handled asap */ 42 break; 43 case EXCP_SYSCALL: 44 /* Return address is 4 bytes after the call. */ 45 env->regs[14] += 4; 46 env->pc = env->regs[14]; 47 ret = do_syscall(env, 48 env->regs[12], 49 env->regs[5], 50 env->regs[6], 51 env->regs[7], 52 env->regs[8], 53 env->regs[9], 54 env->regs[10], 55 0, 0); 56 if (ret == -QEMU_ERESTARTSYS) { 57 /* Wind back to before the syscall. */ 58 env->pc -= 4; 59 } else if (ret != -QEMU_ESIGRETURN) { 60 env->regs[3] = ret; 61 } 62 /* All syscall exits result in guest r14 being equal to the 63 * PC we return to, because the kernel syscall exit "rtbd" does 64 * this. (This is true even for sigreturn(); note that r14 is 65 * not a userspace-usable register, as the kernel may clobber it 66 * at any point.) 67 */ 68 env->regs[14] = env->pc; 69 break; 70 case EXCP_HW_EXCP: 71 env->regs[17] = env->pc + 4; 72 if (env->iflags & D_FLAG) { 73 env->esr |= 1 << 12; 74 env->pc -= 4; 75 /* FIXME: if branch was immed, replay the imm as well. */ 76 } 77 78 env->iflags &= ~(IMM_FLAG | D_FLAG); 79 80 switch (env->esr & 31) { 81 case ESR_EC_DIVZERO: 82 info.si_signo = TARGET_SIGFPE; 83 info.si_errno = 0; 84 info.si_code = TARGET_FPE_FLTDIV; 85 info._sifields._sigfault._addr = 0; 86 queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info); 87 break; 88 case ESR_EC_FPU: 89 info.si_signo = TARGET_SIGFPE; 90 info.si_errno = 0; 91 if (env->fsr & FSR_IO) { 92 info.si_code = TARGET_FPE_FLTINV; 93 } 94 if (env->fsr & FSR_DZ) { 95 info.si_code = TARGET_FPE_FLTDIV; 96 } 97 info._sifields._sigfault._addr = 0; 98 queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info); 99 break; 100 default: 101 fprintf(stderr, "Unhandled hw-exception: 0x%x\n", 102 env->esr & ESR_EC_MASK); 103 cpu_dump_state(cs, stderr, 0); 104 exit(EXIT_FAILURE); 105 break; 106 } 107 break; 108 case EXCP_DEBUG: 109 info.si_signo = TARGET_SIGTRAP; 110 info.si_errno = 0; 111 info.si_code = TARGET_TRAP_BRKPT; 112 queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info); 113 break; 114 case EXCP_ATOMIC: 115 cpu_exec_step_atomic(cs); 116 break; 117 default: 118 fprintf(stderr, "Unhandled trap: 0x%x\n", trapnr); 119 cpu_dump_state(cs, stderr, 0); 120 exit(EXIT_FAILURE); 121 } 122 process_pending_signals (env); 123 } 124 } 125 126 void target_cpu_copy_regs(CPUArchState *env, struct target_pt_regs *regs) 127 { 128 env->regs[0] = regs->r0; 129 env->regs[1] = regs->r1; 130 env->regs[2] = regs->r2; 131 env->regs[3] = regs->r3; 132 env->regs[4] = regs->r4; 133 env->regs[5] = regs->r5; 134 env->regs[6] = regs->r6; 135 env->regs[7] = regs->r7; 136 env->regs[8] = regs->r8; 137 env->regs[9] = regs->r9; 138 env->regs[10] = regs->r10; 139 env->regs[11] = regs->r11; 140 env->regs[12] = regs->r12; 141 env->regs[13] = regs->r13; 142 env->regs[14] = regs->r14; 143 env->regs[15] = regs->r15; 144 env->regs[16] = regs->r16; 145 env->regs[17] = regs->r17; 146 env->regs[18] = regs->r18; 147 env->regs[19] = regs->r19; 148 env->regs[20] = regs->r20; 149 env->regs[21] = regs->r21; 150 env->regs[22] = regs->r22; 151 env->regs[23] = regs->r23; 152 env->regs[24] = regs->r24; 153 env->regs[25] = regs->r25; 154 env->regs[26] = regs->r26; 155 env->regs[27] = regs->r27; 156 env->regs[28] = regs->r28; 157 env->regs[29] = regs->r29; 158 env->regs[30] = regs->r30; 159 env->regs[31] = regs->r31; 160 env->pc = regs->pc; 161 } 162