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 "cpu_loop-common.h" 24 #include "signal-common.h" 25 26 void cpu_loop(CPUMBState *env) 27 { 28 CPUState *cs = env_cpu(env); 29 int trapnr, ret; 30 target_siginfo_t info; 31 32 while (1) { 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 0xaa: 40 { 41 info.si_signo = TARGET_SIGSEGV; 42 info.si_errno = 0; 43 /* XXX: check env->error_code */ 44 info.si_code = TARGET_SEGV_MAPERR; 45 info._sifields._sigfault._addr = 0; 46 queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info); 47 } 48 break; 49 case EXCP_INTERRUPT: 50 /* just indicate that signals should be handled asap */ 51 break; 52 case EXCP_SYSCALL: 53 /* Return address is 4 bytes after the call. */ 54 env->regs[14] += 4; 55 env->pc = env->regs[14]; 56 ret = do_syscall(env, 57 env->regs[12], 58 env->regs[5], 59 env->regs[6], 60 env->regs[7], 61 env->regs[8], 62 env->regs[9], 63 env->regs[10], 64 0, 0); 65 if (ret == -TARGET_ERESTARTSYS) { 66 /* Wind back to before the syscall. */ 67 env->pc -= 4; 68 } else if (ret != -TARGET_QEMU_ESIGRETURN) { 69 env->regs[3] = ret; 70 } 71 /* All syscall exits result in guest r14 being equal to the 72 * PC we return to, because the kernel syscall exit "rtbd" does 73 * this. (This is true even for sigreturn(); note that r14 is 74 * not a userspace-usable register, as the kernel may clobber it 75 * at any point.) 76 */ 77 env->regs[14] = env->pc; 78 break; 79 case EXCP_HW_EXCP: 80 env->regs[17] = env->pc + 4; 81 if (env->iflags & D_FLAG) { 82 env->esr |= 1 << 12; 83 env->pc -= 4; 84 /* FIXME: if branch was immed, replay the imm as well. */ 85 } 86 87 env->iflags &= ~(IMM_FLAG | D_FLAG); 88 89 switch (env->esr & 31) { 90 case ESR_EC_DIVZERO: 91 info.si_signo = TARGET_SIGFPE; 92 info.si_errno = 0; 93 info.si_code = TARGET_FPE_FLTDIV; 94 info._sifields._sigfault._addr = 0; 95 queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info); 96 break; 97 case ESR_EC_FPU: 98 info.si_signo = TARGET_SIGFPE; 99 info.si_errno = 0; 100 if (env->fsr & FSR_IO) { 101 info.si_code = TARGET_FPE_FLTINV; 102 } 103 if (env->fsr & FSR_DZ) { 104 info.si_code = TARGET_FPE_FLTDIV; 105 } 106 info._sifields._sigfault._addr = 0; 107 queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info); 108 break; 109 default: 110 fprintf(stderr, "Unhandled hw-exception: 0x%x\n", 111 env->esr & ESR_EC_MASK); 112 cpu_dump_state(cs, stderr, 0); 113 exit(EXIT_FAILURE); 114 break; 115 } 116 break; 117 case EXCP_DEBUG: 118 info.si_signo = TARGET_SIGTRAP; 119 info.si_errno = 0; 120 info.si_code = TARGET_TRAP_BRKPT; 121 queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info); 122 break; 123 case EXCP_ATOMIC: 124 cpu_exec_step_atomic(cs); 125 break; 126 default: 127 fprintf(stderr, "Unhandled trap: 0x%x\n", trapnr); 128 cpu_dump_state(cs, stderr, 0); 129 exit(EXIT_FAILURE); 130 } 131 process_pending_signals (env); 132 } 133 } 134 135 void target_cpu_copy_regs(CPUArchState *env, struct target_pt_regs *regs) 136 { 137 env->regs[0] = regs->r0; 138 env->regs[1] = regs->r1; 139 env->regs[2] = regs->r2; 140 env->regs[3] = regs->r3; 141 env->regs[4] = regs->r4; 142 env->regs[5] = regs->r5; 143 env->regs[6] = regs->r6; 144 env->regs[7] = regs->r7; 145 env->regs[8] = regs->r8; 146 env->regs[9] = regs->r9; 147 env->regs[10] = regs->r10; 148 env->regs[11] = regs->r11; 149 env->regs[12] = regs->r12; 150 env->regs[13] = regs->r13; 151 env->regs[14] = regs->r14; 152 env->regs[15] = regs->r15; 153 env->regs[16] = regs->r16; 154 env->regs[17] = regs->r17; 155 env->regs[18] = regs->r18; 156 env->regs[19] = regs->r19; 157 env->regs[20] = regs->r20; 158 env->regs[21] = regs->r21; 159 env->regs[22] = regs->r22; 160 env->regs[23] = regs->r23; 161 env->regs[24] = regs->r24; 162 env->regs[25] = regs->r25; 163 env->regs[26] = regs->r26; 164 env->regs[27] = regs->r27; 165 env->regs[28] = regs->r28; 166 env->regs[29] = regs->r29; 167 env->regs[30] = regs->r30; 168 env->regs[31] = regs->r31; 169 env->pc = regs->pc; 170 } 171