cpu_loop.c (5488B)
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 "user-internals.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, si_code; 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 EXCP_INTERRUPT: 39 /* just indicate that signals should be handled asap */ 40 break; 41 case EXCP_SYSCALL: 42 /* Return address is 4 bytes after the call. */ 43 env->regs[14] += 4; 44 env->pc = env->regs[14]; 45 ret = do_syscall(env, 46 env->regs[12], 47 env->regs[5], 48 env->regs[6], 49 env->regs[7], 50 env->regs[8], 51 env->regs[9], 52 env->regs[10], 53 0, 0); 54 if (ret == -QEMU_ERESTARTSYS) { 55 /* Wind back to before the syscall. */ 56 env->pc -= 4; 57 } else if (ret != -QEMU_ESIGRETURN) { 58 env->regs[3] = ret; 59 } 60 /* All syscall exits result in guest r14 being equal to the 61 * PC we return to, because the kernel syscall exit "rtbd" does 62 * this. (This is true even for sigreturn(); note that r14 is 63 * not a userspace-usable register, as the kernel may clobber it 64 * at any point.) 65 */ 66 env->regs[14] = env->pc; 67 break; 68 69 case EXCP_HW_EXCP: 70 env->regs[17] = env->pc + 4; 71 if (env->iflags & D_FLAG) { 72 env->esr |= 1 << 12; 73 env->pc -= 4; 74 /* FIXME: if branch was immed, replay the imm as well. */ 75 } 76 env->iflags &= ~(IMM_FLAG | D_FLAG); 77 switch (env->esr & 31) { 78 case ESR_EC_DIVZERO: 79 si_code = TARGET_FPE_INTDIV; 80 break; 81 case ESR_EC_FPU: 82 /* 83 * Note that the kernel passes along fsr as si_code 84 * if there's no recognized bit set. Possibly this 85 * implies that si_code is 0, but follow the structure. 86 */ 87 si_code = env->fsr; 88 if (si_code & FSR_IO) { 89 si_code = TARGET_FPE_FLTINV; 90 } else if (si_code & FSR_OF) { 91 si_code = TARGET_FPE_FLTOVF; 92 } else if (si_code & FSR_UF) { 93 si_code = TARGET_FPE_FLTUND; 94 } else if (si_code & FSR_DZ) { 95 si_code = TARGET_FPE_FLTDIV; 96 } else if (si_code & FSR_DO) { 97 si_code = TARGET_FPE_FLTRES; 98 } 99 break; 100 default: 101 fprintf(stderr, "Unhandled hw-exception: 0x%x\n", 102 env->esr & ESR_EC_MASK); 103 cpu_dump_state(cs, stderr, 0); 104 exit(EXIT_FAILURE); 105 } 106 force_sig_fault(TARGET_SIGFPE, si_code, env->pc); 107 break; 108 109 case EXCP_DEBUG: 110 force_sig_fault(TARGET_SIGTRAP, TARGET_TRAP_BRKPT, env->pc); 111 break; 112 case EXCP_ATOMIC: 113 cpu_exec_step_atomic(cs); 114 break; 115 default: 116 fprintf(stderr, "Unhandled trap: 0x%x\n", trapnr); 117 cpu_dump_state(cs, stderr, 0); 118 exit(EXIT_FAILURE); 119 } 120 process_pending_signals (env); 121 } 122 } 123 124 void target_cpu_copy_regs(CPUArchState *env, struct target_pt_regs *regs) 125 { 126 env->regs[0] = regs->r0; 127 env->regs[1] = regs->r1; 128 env->regs[2] = regs->r2; 129 env->regs[3] = regs->r3; 130 env->regs[4] = regs->r4; 131 env->regs[5] = regs->r5; 132 env->regs[6] = regs->r6; 133 env->regs[7] = regs->r7; 134 env->regs[8] = regs->r8; 135 env->regs[9] = regs->r9; 136 env->regs[10] = regs->r10; 137 env->regs[11] = regs->r11; 138 env->regs[12] = regs->r12; 139 env->regs[13] = regs->r13; 140 env->regs[14] = regs->r14; 141 env->regs[15] = regs->r15; 142 env->regs[16] = regs->r16; 143 env->regs[17] = regs->r17; 144 env->regs[18] = regs->r18; 145 env->regs[19] = regs->r19; 146 env->regs[20] = regs->r20; 147 env->regs[21] = regs->r21; 148 env->regs[22] = regs->r22; 149 env->regs[23] = regs->r23; 150 env->regs[24] = regs->r24; 151 env->regs[25] = regs->r25; 152 env->regs[26] = regs->r26; 153 env->regs[27] = regs->r27; 154 env->regs[28] = regs->r28; 155 env->regs[29] = regs->r29; 156 env->regs[30] = regs->r30; 157 env->regs[31] = regs->r31; 158 env->pc = regs->pc; 159 }