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 25 void cpu_loop(CPUMBState *env) 26 { 27 CPUState *cs = env_cpu(env); 28 int trapnr, ret; 29 target_siginfo_t info; 30 31 while (1) { 32 cpu_exec_start(cs); 33 trapnr = cpu_exec(cs); 34 cpu_exec_end(cs); 35 process_queued_cpu_work(cs); 36 37 switch (trapnr) { 38 case 0xaa: 39 { 40 info.si_signo = TARGET_SIGSEGV; 41 info.si_errno = 0; 42 /* XXX: check env->error_code */ 43 info.si_code = TARGET_SEGV_MAPERR; 44 info._sifields._sigfault._addr = 0; 45 queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info); 46 } 47 break; 48 case EXCP_INTERRUPT: 49 /* just indicate that signals should be handled asap */ 50 break; 51 case EXCP_BREAK: 52 /* Return address is 4 bytes after the call. */ 53 env->regs[14] += 4; 54 env->sregs[SR_PC] = env->regs[14]; 55 ret = do_syscall(env, 56 env->regs[12], 57 env->regs[5], 58 env->regs[6], 59 env->regs[7], 60 env->regs[8], 61 env->regs[9], 62 env->regs[10], 63 0, 0); 64 if (ret == -TARGET_ERESTARTSYS) { 65 /* Wind back to before the syscall. */ 66 env->sregs[SR_PC] -= 4; 67 } else if (ret != -TARGET_QEMU_ESIGRETURN) { 68 env->regs[3] = ret; 69 } 70 /* All syscall exits result in guest r14 being equal to the 71 * PC we return to, because the kernel syscall exit "rtbd" does 72 * this. (This is true even for sigreturn(); note that r14 is 73 * not a userspace-usable register, as the kernel may clobber it 74 * at any point.) 75 */ 76 env->regs[14] = env->sregs[SR_PC]; 77 break; 78 case EXCP_HW_EXCP: 79 env->regs[17] = env->sregs[SR_PC] + 4; 80 if (env->iflags & D_FLAG) { 81 env->sregs[SR_ESR] |= 1 << 12; 82 env->sregs[SR_PC] -= 4; 83 /* FIXME: if branch was immed, replay the imm as well. */ 84 } 85 86 env->iflags &= ~(IMM_FLAG | D_FLAG); 87 88 switch (env->sregs[SR_ESR] & 31) { 89 case ESR_EC_DIVZERO: 90 info.si_signo = TARGET_SIGFPE; 91 info.si_errno = 0; 92 info.si_code = TARGET_FPE_FLTDIV; 93 info._sifields._sigfault._addr = 0; 94 queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info); 95 break; 96 case ESR_EC_FPU: 97 info.si_signo = TARGET_SIGFPE; 98 info.si_errno = 0; 99 if (env->sregs[SR_FSR] & FSR_IO) { 100 info.si_code = TARGET_FPE_FLTINV; 101 } 102 if (env->sregs[SR_FSR] & FSR_DZ) { 103 info.si_code = TARGET_FPE_FLTDIV; 104 } 105 info._sifields._sigfault._addr = 0; 106 queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info); 107 break; 108 default: 109 fprintf(stderr, "Unhandled hw-exception: 0x%" PRIx64 "\n", 110 env->sregs[SR_ESR] & ESR_EC_MASK); 111 cpu_dump_state(cs, stderr, 0); 112 exit(EXIT_FAILURE); 113 break; 114 } 115 break; 116 case EXCP_DEBUG: 117 info.si_signo = TARGET_SIGTRAP; 118 info.si_errno = 0; 119 info.si_code = TARGET_TRAP_BRKPT; 120 queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info); 121 break; 122 case EXCP_ATOMIC: 123 cpu_exec_step_atomic(cs); 124 break; 125 default: 126 fprintf(stderr, "Unhandled trap: 0x%x\n", trapnr); 127 cpu_dump_state(cs, stderr, 0); 128 exit(EXIT_FAILURE); 129 } 130 process_pending_signals (env); 131 } 132 } 133 134 void target_cpu_copy_regs(CPUArchState *env, struct target_pt_regs *regs) 135 { 136 env->regs[0] = regs->r0; 137 env->regs[1] = regs->r1; 138 env->regs[2] = regs->r2; 139 env->regs[3] = regs->r3; 140 env->regs[4] = regs->r4; 141 env->regs[5] = regs->r5; 142 env->regs[6] = regs->r6; 143 env->regs[7] = regs->r7; 144 env->regs[8] = regs->r8; 145 env->regs[9] = regs->r9; 146 env->regs[10] = regs->r10; 147 env->regs[11] = regs->r11; 148 env->regs[12] = regs->r12; 149 env->regs[13] = regs->r13; 150 env->regs[14] = regs->r14; 151 env->regs[15] = regs->r15; 152 env->regs[16] = regs->r16; 153 env->regs[17] = regs->r17; 154 env->regs[18] = regs->r18; 155 env->regs[19] = regs->r19; 156 env->regs[20] = regs->r20; 157 env->regs[21] = regs->r21; 158 env->regs[22] = regs->r22; 159 env->regs[23] = regs->r23; 160 env->regs[24] = regs->r24; 161 env->regs[25] = regs->r25; 162 env->regs[26] = regs->r26; 163 env->regs[27] = regs->r27; 164 env->regs[28] = regs->r28; 165 env->regs[29] = regs->r29; 166 env->regs[30] = regs->r30; 167 env->regs[31] = regs->r31; 168 env->sregs[SR_PC] = regs->pc; 169 } 170