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 0xaa: 41 { 42 info.si_signo = TARGET_SIGSEGV; 43 info.si_errno = 0; 44 /* XXX: check env->error_code */ 45 info.si_code = TARGET_SEGV_MAPERR; 46 info._sifields._sigfault._addr = 0; 47 queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info); 48 } 49 break; 50 case EXCP_INTERRUPT: 51 /* just indicate that signals should be handled asap */ 52 break; 53 case EXCP_SYSCALL: 54 /* Return address is 4 bytes after the call. */ 55 env->regs[14] += 4; 56 env->pc = env->regs[14]; 57 ret = do_syscall(env, 58 env->regs[12], 59 env->regs[5], 60 env->regs[6], 61 env->regs[7], 62 env->regs[8], 63 env->regs[9], 64 env->regs[10], 65 0, 0); 66 if (ret == -TARGET_ERESTARTSYS) { 67 /* Wind back to before the syscall. */ 68 env->pc -= 4; 69 } else if (ret != -TARGET_QEMU_ESIGRETURN) { 70 env->regs[3] = ret; 71 } 72 /* All syscall exits result in guest r14 being equal to the 73 * PC we return to, because the kernel syscall exit "rtbd" does 74 * this. (This is true even for sigreturn(); note that r14 is 75 * not a userspace-usable register, as the kernel may clobber it 76 * at any point.) 77 */ 78 env->regs[14] = env->pc; 79 break; 80 case EXCP_HW_EXCP: 81 env->regs[17] = env->pc + 4; 82 if (env->iflags & D_FLAG) { 83 env->esr |= 1 << 12; 84 env->pc -= 4; 85 /* FIXME: if branch was immed, replay the imm as well. */ 86 } 87 88 env->iflags &= ~(IMM_FLAG | D_FLAG); 89 90 switch (env->esr & 31) { 91 case ESR_EC_DIVZERO: 92 info.si_signo = TARGET_SIGFPE; 93 info.si_errno = 0; 94 info.si_code = TARGET_FPE_FLTDIV; 95 info._sifields._sigfault._addr = 0; 96 queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info); 97 break; 98 case ESR_EC_FPU: 99 info.si_signo = TARGET_SIGFPE; 100 info.si_errno = 0; 101 if (env->fsr & FSR_IO) { 102 info.si_code = TARGET_FPE_FLTINV; 103 } 104 if (env->fsr & FSR_DZ) { 105 info.si_code = TARGET_FPE_FLTDIV; 106 } 107 info._sifields._sigfault._addr = 0; 108 queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info); 109 break; 110 default: 111 fprintf(stderr, "Unhandled hw-exception: 0x%x\n", 112 env->esr & ESR_EC_MASK); 113 cpu_dump_state(cs, stderr, 0); 114 exit(EXIT_FAILURE); 115 break; 116 } 117 break; 118 case EXCP_DEBUG: 119 info.si_signo = TARGET_SIGTRAP; 120 info.si_errno = 0; 121 info.si_code = TARGET_TRAP_BRKPT; 122 queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info); 123 break; 124 case EXCP_ATOMIC: 125 cpu_exec_step_atomic(cs); 126 break; 127 default: 128 fprintf(stderr, "Unhandled trap: 0x%x\n", trapnr); 129 cpu_dump_state(cs, stderr, 0); 130 exit(EXIT_FAILURE); 131 } 132 process_pending_signals (env); 133 } 134 } 135 136 void target_cpu_copy_regs(CPUArchState *env, struct target_pt_regs *regs) 137 { 138 env->regs[0] = regs->r0; 139 env->regs[1] = regs->r1; 140 env->regs[2] = regs->r2; 141 env->regs[3] = regs->r3; 142 env->regs[4] = regs->r4; 143 env->regs[5] = regs->r5; 144 env->regs[6] = regs->r6; 145 env->regs[7] = regs->r7; 146 env->regs[8] = regs->r8; 147 env->regs[9] = regs->r9; 148 env->regs[10] = regs->r10; 149 env->regs[11] = regs->r11; 150 env->regs[12] = regs->r12; 151 env->regs[13] = regs->r13; 152 env->regs[14] = regs->r14; 153 env->regs[15] = regs->r15; 154 env->regs[16] = regs->r16; 155 env->regs[17] = regs->r17; 156 env->regs[18] = regs->r18; 157 env->regs[19] = regs->r19; 158 env->regs[20] = regs->r20; 159 env->regs[21] = regs->r21; 160 env->regs[22] = regs->r22; 161 env->regs[23] = regs->r23; 162 env->regs[24] = regs->r24; 163 env->regs[25] = regs->r25; 164 env->regs[26] = regs->r26; 165 env->regs[27] = regs->r27; 166 env->regs[28] = regs->r28; 167 env->regs[29] = regs->r29; 168 env->regs[30] = regs->r30; 169 env->regs[31] = regs->r31; 170 env->pc = regs->pc; 171 } 172