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 "user-internals.h"
  23 #include "cpu_loop-common.h"
  24 #include "signal-common.h"
  25 #include "qemu/guest-random.h"
  26 #include "semihosting/common-semi.h"
  27 #include "target/arm/syndrome.h"
  28
  29 #define get_user_code_u32(x, gaddr, env)                \
  30     ({ abi_long __r = get_user_u32((x), (gaddr));       \
  31         if (!__r && bswap_code(arm_sctlr_b(env))) {     \
  32             (x) = bswap32(x);                           \
  33         }                                               \
  34         __r;                                            \
  35     })
  36
  37 #define get_user_code_u16(x, gaddr, env)                \
  38     ({ abi_long __r = get_user_u16((x), (gaddr));       \
  39         if (!__r && bswap_code(arm_sctlr_b(env))) {     \
  40             (x) = bswap16(x);                           \
  41         }                                               \
  42         __r;                                            \
  43     })
  44
  45 #define get_user_data_u32(x, gaddr, env)                \
  46     ({ abi_long __r = get_user_u32((x), (gaddr));       \
  47         if (!__r && arm_cpu_bswap_data(env)) {          \
  48             (x) = bswap32(x);                           \
  49         }                                               \
  50         __r;                                            \
  51     })
  52
  53 #define get_user_data_u16(x, gaddr, env)                \
  54     ({ abi_long __r = get_user_u16((x), (gaddr));       \
  55         if (!__r && arm_cpu_bswap_data(env)) {          \
  56             (x) = bswap16(x);                           \
  57         }                                               \
  58         __r;                                            \
  59     })
  60
  61 #define put_user_data_u32(x, gaddr, env)                \
  62     ({ typeof(x) __x = (x);                             \
  63         if (arm_cpu_bswap_data(env)) {                  \
  64             __x = bswap32(__x);                         \
  65         }                                               \
  66         put_user_u32(__x, (gaddr));                     \
  67     })
  68
  69 #define put_user_data_u16(x, gaddr, env)                \
  70     ({ typeof(x) __x = (x);                             \
  71         if (arm_cpu_bswap_data(env)) {                  \
  72             __x = bswap16(__x);                         \
  73         }                                               \
  74         put_user_u16(__x, (gaddr));                     \
  75     })
  76
  77 /* AArch64 main loop */
  78 void cpu_loop(CPUARMState *env)
  79 {
  80     CPUState *cs = env_cpu(env);
  81     int trapnr, ec, fsc, si_code, si_signo;
  82     abi_long ret;
  83
  84     for (;;) {
  85         cpu_exec_start(cs);
  86         trapnr = cpu_exec(cs);
  87         cpu_exec_end(cs);
  88         process_queued_cpu_work(cs);
  89
  90         switch (trapnr) {
  91         case EXCP_SWI:
  92             /* On syscall, PSTATE.ZA is preserved, PSTATE.SM is cleared. */
  93             aarch64_set_svcr(env, 0, R_SVCR_SM_MASK);
  94             ret = do_syscall(env,
  95                              env->xregs[8],
  96                              env->xregs[0],
  97                              env->xregs[1],
  98                              env->xregs[2],
  99                              env->xregs[3],
 100                              env->xregs[4],
 101                              env->xregs[5],
 102                              0, 0);
 103             if (ret == -QEMU_ERESTARTSYS) {
 104                 env->pc -= 4;
 105             } else if (ret != -QEMU_ESIGRETURN) {
 106                 env->xregs[0] = ret;
 107             }
 108             break;
 109         case EXCP_INTERRUPT:
 110             /* just indicate that signals should be handled asap */
 111             break;
 112         case EXCP_UDEF:
 113             force_sig_fault(TARGET_SIGILL, TARGET_ILL_ILLOPN, env->pc);
 114             break;
 115         case EXCP_PREFETCH_ABORT:
 116         case EXCP_DATA_ABORT:
 117             ec = syn_get_ec(env->exception.syndrome);
 118             switch (ec) {
 119             case EC_DATAABORT:
 120             case EC_INSNABORT:
 121                 /* Both EC have the same format for FSC, or close enough. */
 122                 fsc = extract32(env->exception.syndrome, 0, 6);
 123                 switch (fsc) {
 124                 case 0x04 ... 0x07: /* Translation fault, level {0-3} */
 125                     si_signo = TARGET_SIGSEGV;
 126                     si_code = TARGET_SEGV_MAPERR;
 127                     break;
 128                 case 0x09 ... 0x0b: /* Access flag fault, level {1-3} */
 129                 case 0x0d ... 0x0f: /* Permission fault, level {1-3} */
 130                     si_signo = TARGET_SIGSEGV;
 131                     si_code = TARGET_SEGV_ACCERR;
 132                     break;
 133                 case 0x11: /* Synchronous Tag Check Fault */
 134                     si_signo = TARGET_SIGSEGV;
 135                     si_code = TARGET_SEGV_MTESERR;
 136                     break;
 137                 case 0x21: /* Alignment fault */
 138                     si_signo = TARGET_SIGBUS;
 139                     si_code = TARGET_BUS_ADRALN;
 140                     break;
 141                 default:
 142                     g_assert_not_reached();
 143                 }
 144                 break;
 145             case EC_PCALIGNMENT:
 146                 si_signo = TARGET_SIGBUS;
 147                 si_code = TARGET_BUS_ADRALN;
 148                 break;
 149             default:
 150                 g_assert_not_reached();
 151             }
 152             force_sig_fault(si_signo, si_code, env->exception.vaddress);
 153             break;
 154         case EXCP_DEBUG:
 155         case EXCP_BKPT:
 156             force_sig_fault(TARGET_SIGTRAP, TARGET_TRAP_BRKPT, env->pc);
 157             break;
 158         case EXCP_SEMIHOST:
 159             do_common_semihosting(cs);
 160             env->pc += 4;
 161             break;
 162         case EXCP_YIELD:
 163             /* nothing to do here for user-mode, just resume guest code */
 164             break;
 165         case EXCP_ATOMIC:
 166             cpu_exec_step_atomic(cs);
 167             break;
 168         default:
 169             EXCP_DUMP(env, "qemu: unhandled CPU exception 0x%x - aborting\n", trapnr);
 170             abort();
 171         }
 172
 173         /* Check for MTE asynchronous faults */
 174         if (unlikely(env->cp15.tfsr_el[0])) {
 175             env->cp15.tfsr_el[0] = 0;
 176             force_sig_fault(TARGET_SIGSEGV, TARGET_SEGV_MTEAERR, 0);
 177         }
 178
 179         process_pending_signals(env);
 180         /* Exception return on AArch64 always clears the exclusive monitor,
 181          * so any return to running guest code implies this.
 182          */
 183         env->exclusive_addr = -1;
 184     }
 185 }
 186
 187 void target_cpu_copy_regs(CPUArchState *env, struct target_pt_regs *regs)
 188 {
 189     ARMCPU *cpu = env_archcpu(env);
 190     CPUState *cs = env_cpu(env);
 191     TaskState *ts = cs->opaque;
 192     struct image_info *info = ts->info;
 193     int i;
 194
 195     if (!(arm_feature(env, ARM_FEATURE_AARCH64))) {
 196         fprintf(stderr,
 197                 "The selected ARM CPU does not support 64 bit mode\n");
 198         exit(EXIT_FAILURE);
 199     }
 200
 201     for (i = 0; i < 31; i++) {
 202         env->xregs[i] = regs->regs[i];
 203     }
 204     env->pc = regs->pc;
 205     env->xregs[31] = regs->sp;
 206 #if TARGET_BIG_ENDIAN
 207     env->cp15.sctlr_el[1] |= SCTLR_E0E;
 208     for (i = 1; i < 4; ++i) {
 209         env->cp15.sctlr_el[i] |= SCTLR_EE;
 210     }
 211     arm_rebuild_hflags(env);
 212 #endif
 213
 214     if (cpu_isar_feature(aa64_pauth, cpu)) {
 215         qemu_guest_getrandom_nofail(&env->keys, sizeof(env->keys));
 216     }
 217
 218     ts->stack_base = info->start_stack;
 219     ts->heap_base = info->brk;
 220     /* This will be filled in on the first SYS_HEAPINFO call.  */
 221     ts->heap_limit = 0;
 222 }