LXR qemu/target/arm/arm

   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 */
  27static 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 */
  38static 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
  57