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