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 "user-internals.h"
  24 #include "cpu_loop-common.h"
  25 #include "signal-common.h"
  26 #include "qemu/guest-random.h"
  27 #include "semihosting/common-semi.h"
  28 #include "target/arm/syndrome.h"
  29
  30 #define get_user_code_u32(x, gaddr, env)                \
  31     ({ abi_long __r = get_user_u32((x), (gaddr));       \
  32         if (!__r && bswap_code(arm_sctlr_b(env))) {     \
  33             (x) = bswap32(x);                           \
  34         }                                               \
  35         __r;                                            \
  36     })
  37
  38 #define get_user_code_u16(x, gaddr, env)                \
  39     ({ abi_long __r = get_user_u16((x), (gaddr));       \
  40         if (!__r && bswap_code(arm_sctlr_b(env))) {     \
  41             (x) = bswap16(x);                           \
  42         }                                               \
  43         __r;                                            \
  44     })
  45
  46 #define get_user_data_u32(x, gaddr, env)                \
  47     ({ abi_long __r = get_user_u32((x), (gaddr));       \
  48         if (!__r && arm_cpu_bswap_data(env)) {          \
  49             (x) = bswap32(x);                           \
  50         }                                               \
  51         __r;                                            \
  52     })
  53
  54 #define get_user_data_u16(x, gaddr, env)                \
  55     ({ abi_long __r = get_user_u16((x), (gaddr));       \
  56         if (!__r && arm_cpu_bswap_data(env)) {          \
  57             (x) = bswap16(x);                           \
  58         }                                               \
  59         __r;                                            \
  60     })
  61
  62 #define put_user_data_u32(x, gaddr, env)                \
  63     ({ typeof(x) __x = (x);                             \
  64         if (arm_cpu_bswap_data(env)) {                  \
  65             __x = bswap32(__x);                         \
  66         }                                               \
  67         put_user_u32(__x, (gaddr));                     \
  68     })
  69
  70 #define put_user_data_u16(x, gaddr, env)                \
  71     ({ typeof(x) __x = (x);                             \
  72         if (arm_cpu_bswap_data(env)) {                  \
  73             __x = bswap16(__x);                         \
  74         }                                               \
  75         put_user_u16(__x, (gaddr));                     \
  76     })
  77
  78 /* AArch64 main loop */
  79 void cpu_loop(CPUARMState *env)
  80 {
  81     CPUState *cs = env_cpu(env);
  82     int trapnr, ec, fsc, si_code, si_signo;
  83     abi_long ret;
  84
  85     for (;;) {
  86         cpu_exec_start(cs);
  87         trapnr = cpu_exec(cs);
  88         cpu_exec_end(cs);
  89         process_queued_cpu_work(cs);
  90
  91         switch (trapnr) {
  92         case EXCP_SWI:
  93             ret = do_syscall(env,
  94                              env->xregs[8],
  95                              env->xregs[0],
  96                              env->xregs[1],
  97                              env->xregs[2],
  98                              env->xregs[3],
  99                              env->xregs[4],
 100                              env->xregs[5],
 101                              0, 0);
 102             if (ret == -QEMU_ERESTARTSYS) {
 103                 env->pc -= 4;
 104             } else if (ret != -TARGET_QEMU_ESIGRETURN) {
 105                 env->xregs[0] = ret;
 106             }
 107             break;
 108         case EXCP_INTERRUPT:
 109             /* just indicate that signals should be handled asap */
 110             break;
 111         case EXCP_UDEF:
 112             force_sig_fault(TARGET_SIGILL, TARGET_ILL_ILLOPN, env->pc);
 113             break;
 114         case EXCP_PREFETCH_ABORT:
 115         case EXCP_DATA_ABORT:
 116             ec = syn_get_ec(env->exception.syndrome);
 117             switch (ec) {
 118             case EC_DATAABORT:
 119             case EC_INSNABORT:
 120                 /* Both EC have the same format for FSC, or close enough. */
 121                 fsc = extract32(env->exception.syndrome, 0, 6);
 122                 switch (fsc) {
 123                 case 0x04 ... 0x07: /* Translation fault, level {0-3} */
 124                     si_signo = TARGET_SIGSEGV;
 125                     si_code = TARGET_SEGV_MAPERR;
 126                     break;
 127                 case 0x09 ... 0x0b: /* Access flag fault, level {1-3} */
 128                 case 0x0d ... 0x0f: /* Permission fault, level {1-3} */
 129                     si_signo = TARGET_SIGSEGV;
 130                     si_code = TARGET_SEGV_ACCERR;
 131                     break;
 132                 case 0x11: /* Synchronous Tag Check Fault */
 133                     si_signo = TARGET_SIGSEGV;
 134                     si_code = TARGET_SEGV_MTESERR;
 135                     break;
 136                 case 0x21: /* Alignment fault */
 137                     si_signo = TARGET_SIGBUS;
 138                     si_code = TARGET_BUS_ADRALN;
 139                     break;
 140                 default:
 141                     g_assert_not_reached();
 142                 }
 143                 break;
 144             case EC_PCALIGNMENT:
 145                 si_signo = TARGET_SIGBUS;
 146                 si_code = TARGET_BUS_ADRALN;
 147                 break;
 148             default:
 149                 g_assert_not_reached();
 150             }
 151             force_sig_fault(si_signo, si_code, env->exception.vaddress);
 152             break;
 153         case EXCP_DEBUG:
 154         case EXCP_BKPT:
 155             force_sig_fault(TARGET_SIGTRAP, TARGET_TRAP_BRKPT, env->pc);
 156             break;
 157         case EXCP_SEMIHOST:
 158             env->xregs[0] = do_common_semihosting(cs);
 159             env->pc += 4;
 160             break;
 161         case EXCP_YIELD:
 162             /* nothing to do here for user-mode, just resume guest code */
 163             break;
 164         case EXCP_ATOMIC:
 165             cpu_exec_step_atomic(cs);
 166             break;
 167         default:
 168             EXCP_DUMP(env, "qemu: unhandled CPU exception 0x%x - aborting\n", trapnr);
 169             abort();
 170         }
 171
 172         /* Check for MTE asynchronous faults */
 173         if (unlikely(env->cp15.tfsr_el[0])) {
 174             env->cp15.tfsr_el[0] = 0;
 175             force_sig_fault(TARGET_SIGSEGV, TARGET_SEGV_MTEAERR, 0);
 176         }
 177
 178         process_pending_signals(env);
 179         /* Exception return on AArch64 always clears the exclusive monitor,
 180          * so any return to running guest code implies this.
 181          */
 182         env->exclusive_addr = -1;
 183     }
 184 }
 185
 186 void target_cpu_copy_regs(CPUArchState *env, struct target_pt_regs *regs)
 187 {
 188     ARMCPU *cpu = env_archcpu(env);
 189     CPUState *cs = env_cpu(env);
 190     TaskState *ts = cs->opaque;
 191     struct image_info *info = ts->info;
 192     int i;
 193
 194     if (!(arm_feature(env, ARM_FEATURE_AARCH64))) {
 195         fprintf(stderr,
 196                 "The selected ARM CPU does not support 64 bit mode\n");
 197         exit(EXIT_FAILURE);
 198     }
 199
 200     for (i = 0; i < 31; i++) {
 201         env->xregs[i] = regs->regs[i];
 202     }
 203     env->pc = regs->pc;
 204     env->xregs[31] = regs->sp;
 205 #ifdef TARGET_WORDS_BIGENDIAN
 206     env->cp15.sctlr_el[1] |= SCTLR_E0E;
 207     for (i = 1; i < 4; ++i) {
 208         env->cp15.sctlr_el[i] |= SCTLR_EE;
 209     }
 210     arm_rebuild_hflags(env);
 211 #endif
 212
 213     if (cpu_isar_feature(aa64_pauth, cpu)) {
 214         qemu_guest_getrandom_nofail(&env->keys, sizeof(env->keys));
 215     }
 216
 217     ts->stack_base = info->start_stack;
 218     ts->heap_base = info->brk;
 219     /* This will be filled in on the first SYS_HEAPINFO call.  */
 220     ts->heap_limit = 0;
 221 }