linux-user/microblaze/cpu_loop.c

   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 }