linux-user/aarch64/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 "cpu_loop-common.h"
  24 #include "qemu/guest-random.h"
  25
  26 #define get_user_code_u32(x, gaddr, env)                \
  27     ({ abi_long __r = get_user_u32((x), (gaddr));       \
  28         if (!__r && bswap_code(arm_sctlr_b(env))) {     \
  29             (x) = bswap32(x);                           \
  30         }                                               \
  31         __r;                                            \
  32     })
  33
  34 #define get_user_code_u16(x, gaddr, env)                \
  35     ({ abi_long __r = get_user_u16((x), (gaddr));       \
  36         if (!__r && bswap_code(arm_sctlr_b(env))) {     \
  37             (x) = bswap16(x);                           \
  38         }                                               \
  39         __r;                                            \
  40     })
  41
  42 #define get_user_data_u32(x, gaddr, env)                \
  43     ({ abi_long __r = get_user_u32((x), (gaddr));       \
  44         if (!__r && arm_cpu_bswap_data(env)) {          \
  45             (x) = bswap32(x);                           \
  46         }                                               \
  47         __r;                                            \
  48     })
  49
  50 #define get_user_data_u16(x, gaddr, env)                \
  51     ({ abi_long __r = get_user_u16((x), (gaddr));       \
  52         if (!__r && arm_cpu_bswap_data(env)) {          \
  53             (x) = bswap16(x);                           \
  54         }                                               \
  55         __r;                                            \
  56     })
  57
  58 #define put_user_data_u32(x, gaddr, env)                \
  59     ({ typeof(x) __x = (x);                             \
  60         if (arm_cpu_bswap_data(env)) {                  \
  61             __x = bswap32(__x);                         \
  62         }                                               \
  63         put_user_u32(__x, (gaddr));                     \
  64     })
  65
  66 #define put_user_data_u16(x, gaddr, env)                \
  67     ({ typeof(x) __x = (x);                             \
  68         if (arm_cpu_bswap_data(env)) {                  \
  69             __x = bswap16(__x);                         \
  70         }                                               \
  71         put_user_u16(__x, (gaddr));                     \
  72     })
  73
  74 /* AArch64 main loop */
  75 void cpu_loop(CPUARMState *env)
  76 {
  77     CPUState *cs = env_cpu(env);
  78     int trapnr;
  79     abi_long ret;
  80     target_siginfo_t info;
  81
  82     for (;;) {
  83         cpu_exec_start(cs);
  84         trapnr = cpu_exec(cs);
  85         cpu_exec_end(cs);
  86         process_queued_cpu_work(cs);
  87
  88         switch (trapnr) {
  89         case EXCP_SWI:
  90             ret = do_syscall(env,
  91                              env->xregs[8],
  92                              env->xregs[0],
  93                              env->xregs[1],
  94                              env->xregs[2],
  95                              env->xregs[3],
  96                              env->xregs[4],
  97                              env->xregs[5],
  98                              0, 0);
  99             if (ret == -TARGET_ERESTARTSYS) {
 100                 env->pc -= 4;
 101             } else if (ret != -TARGET_QEMU_ESIGRETURN) {
 102                 env->xregs[0] = ret;
 103             }
 104             break;
 105         case EXCP_INTERRUPT:
 106             /* just indicate that signals should be handled asap */
 107             break;
 108         case EXCP_UDEF:
 109             info.si_signo = TARGET_SIGILL;
 110             info.si_errno = 0;
 111             info.si_code = TARGET_ILL_ILLOPN;
 112             info._sifields._sigfault._addr = env->pc;
 113             queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info);
 114             break;
 115         case EXCP_PREFETCH_ABORT:
 116         case EXCP_DATA_ABORT:
 117             info.si_signo = TARGET_SIGSEGV;
 118             info.si_errno = 0;
 119             /* XXX: check env->error_code */
 120             info.si_code = TARGET_SEGV_MAPERR;
 121             info._sifields._sigfault._addr = env->exception.vaddress;
 122             queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info);
 123             break;
 124         case EXCP_DEBUG:
 125         case EXCP_BKPT:
 126             info.si_signo = TARGET_SIGTRAP;
 127             info.si_errno = 0;
 128             info.si_code = TARGET_TRAP_BRKPT;
 129             queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info);
 130             break;
 131         case EXCP_SEMIHOST:
 132             env->xregs[0] = do_arm_semihosting(env);
 133             break;
 134         case EXCP_YIELD:
 135             /* nothing to do here for user-mode, just resume guest code */
 136             break;
 137         case EXCP_ATOMIC:
 138             cpu_exec_step_atomic(cs);
 139             break;
 140         default:
 141             EXCP_DUMP(env, "qemu: unhandled CPU exception 0x%x - aborting\n", trapnr);
 142             abort();
 143         }
 144         process_pending_signals(env);
 145         /* Exception return on AArch64 always clears the exclusive monitor,
 146          * so any return to running guest code implies this.
 147          */
 148         env->exclusive_addr = -1;
 149     }
 150 }
 151
 152 void target_cpu_copy_regs(CPUArchState *env, struct target_pt_regs *regs)
 153 {
 154     ARMCPU *cpu = env_archcpu(env);
 155     CPUState *cs = env_cpu(env);
 156     TaskState *ts = cs->opaque;
 157     struct image_info *info = ts->info;
 158     int i;
 159
 160     if (!(arm_feature(env, ARM_FEATURE_AARCH64))) {
 161         fprintf(stderr,
 162                 "The selected ARM CPU does not support 64 bit mode\n");
 163         exit(EXIT_FAILURE);
 164     }
 165
 166     for (i = 0; i < 31; i++) {
 167         env->xregs[i] = regs->regs[i];
 168     }
 169     env->pc = regs->pc;
 170     env->xregs[31] = regs->sp;
 171 #ifdef TARGET_WORDS_BIGENDIAN
 172     env->cp15.sctlr_el[1] |= SCTLR_E0E;
 173     for (i = 1; i < 4; ++i) {
 174         env->cp15.sctlr_el[i] |= SCTLR_EE;
 175     }
 176 #endif
 177
 178     if (cpu_isar_feature(aa64_pauth, cpu)) {
 179         qemu_guest_getrandom_nofail(&env->keys, sizeof(env->keys));
 180     }
 181
 182     ts->stack_base = info->start_stack;
 183     ts->heap_base = info->brk;
 184     /* This will be filled in on the first SYS_HEAPINFO call.  */
 185     ts->heap_limit = 0;
 186 }