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, si_code; 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 EXCP_INTERRUPT: 40 /* just indicate that signals should be handled asap */ 41 break; 42 case EXCP_SYSCALL: 43 /* Return address is 4 bytes after the call. */ 44 env->regs[14] += 4; 45 env->pc = env->regs[14]; 46 ret = do_syscall(env, 47 env->regs[12], 48 env->regs[5], 49 env->regs[6], 50 env->regs[7], 51 env->regs[8], 52 env->regs[9], 53 env->regs[10], 54 0, 0); 55 if (ret == -QEMU_ERESTARTSYS) { 56 /* Wind back to before the syscall. */ 57 env->pc -= 4; 58 } else if (ret != -QEMU_ESIGRETURN) { 59 env->regs[3] = ret; 60 } 61 /* All syscall exits result in guest r14 being equal to the 62 * PC we return to, because the kernel syscall exit "rtbd" does 63 * this. (This is true even for sigreturn(); note that r14 is 64 * not a userspace-usable register, as the kernel may clobber it 65 * at any point.) 66 */ 67 env->regs[14] = env->pc; 68 break; 69 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 env->iflags &= ~(IMM_FLAG | D_FLAG); 78 switch (env->esr & 31) { 79 case ESR_EC_DIVZERO: 80 si_code = TARGET_FPE_INTDIV; 81 break; 82 case ESR_EC_FPU: 83 /* 84 * Note that the kernel passes along fsr as si_code 85 * if there's no recognized bit set. Possibly this 86 * implies that si_code is 0, but follow the structure. 87 */ 88 si_code = env->fsr; 89 if (si_code & FSR_IO) { 90 si_code = TARGET_FPE_FLTINV; 91 } else if (si_code & FSR_OF) { 92 si_code = TARGET_FPE_FLTOVF; 93 } else if (si_code & FSR_UF) { 94 si_code = TARGET_FPE_FLTUND; 95 } else if (si_code & FSR_DZ) { 96 si_code = TARGET_FPE_FLTDIV; 97 } else if (si_code & FSR_DO) { 98 si_code = TARGET_FPE_FLTRES; 99 } 100 break; 101 default: 102 fprintf(stderr, "Unhandled hw-exception: 0x%x\n", 103 env->esr & ESR_EC_MASK); 104 cpu_dump_state(cs, stderr, 0); 105 exit(EXIT_FAILURE); 106 } 107 force_sig_fault(TARGET_SIGFPE, si_code, env->pc); 108 break; 109 110 case EXCP_DEBUG: 111 force_sig_fault(TARGET_SIGTRAP, TARGET_TRAP_BRKPT, env->pc); 112 break; 113 case EXCP_ATOMIC: 114 cpu_exec_step_atomic(cs); 115 break; 116 default: 117 fprintf(stderr, "Unhandled trap: 0x%x\n", trapnr); 118 cpu_dump_state(cs, stderr, 0); 119 exit(EXIT_FAILURE); 120 } 121 process_pending_signals (env); 122 } 123 } 124 125 void target_cpu_copy_regs(CPUArchState *env, struct target_pt_regs *regs) 126 { 127 env->regs[0] = regs->r0; 128 env->regs[1] = regs->r1; 129 env->regs[2] = regs->r2; 130 env->regs[3] = regs->r3; 131 env->regs[4] = regs->r4; 132 env->regs[5] = regs->r5; 133 env->regs[6] = regs->r6; 134 env->regs[7] = regs->r7; 135 env->regs[8] = regs->r8; 136 env->regs[9] = regs->r9; 137 env->regs[10] = regs->r10; 138 env->regs[11] = regs->r11; 139 env->regs[12] = regs->r12; 140 env->regs[13] = regs->r13; 141 env->regs[14] = regs->r14; 142 env->regs[15] = regs->r15; 143 env->regs[16] = regs->r16; 144 env->regs[17] = regs->r17; 145 env->regs[18] = regs->r18; 146 env->regs[19] = regs->r19; 147 env->regs[20] = regs->r20; 148 env->regs[21] = regs->r21; 149 env->regs[22] = regs->r22; 150 env->regs[23] = regs->r23; 151 env->regs[24] = regs->r24; 152 env->regs[25] = regs->r25; 153 env->regs[26] = regs->r26; 154 env->regs[27] = regs->r27; 155 env->regs[28] = regs->r28; 156 env->regs[29] = regs->r29; 157 env->regs[30] = regs->r30; 158 env->regs[31] = regs->r31; 159 env->pc = regs->pc; 160 } 161