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