target/arm/arm_ldst.h

   1 /*
   2  * ARM load/store instructions for code (armeb-user support)
   3  *
   4  *  Copyright (c) 2012 CodeSourcery, LLC
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2 of the License, or (at your option) any later version.
  10  *
  11  * This library 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 GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 #ifndef ARM_LDST_H
  21 #define ARM_LDST_H
  22
  23 #include "exec/cpu_ldst.h"
  24 #include "qemu/bswap.h"
  25
  26 /* Load an instruction and return it in the standard little-endian order */
  27 static inline uint32_t arm_ldl_code(CPUARMState *env, target_ulong addr,
  28                                     bool sctlr_b)
  29 {
  30     uint32_t insn = cpu_ldl_code(env, addr);
  31     if (bswap_code(sctlr_b)) {
  32         return bswap32(insn);
  33     }
  34     return insn;
  35 }
  36
  37 /* Ditto, for a halfword (Thumb) instruction */
  38 static inline uint16_t arm_lduw_code(CPUARMState *env, target_ulong addr,
  39                                      bool sctlr_b)
  40 {
  41     uint16_t insn;
  42 #ifndef CONFIG_USER_ONLY
  43     /* In big-endian (BE32) mode, adjacent Thumb instructions have been swapped
  44        within each word.  Undo that now.  */
  45     if (sctlr_b) {
  46         addr ^= 2;
  47     }
  48 #endif
  49     insn = cpu_lduw_code(env, addr);
  50     if (bswap_code(sctlr_b)) {
  51         return bswap16(insn);
  52     }
  53     return insn;
  54 }
  55
  56 #endif