LXR qemu/trace/mem.h

   1/*
   2 * Helper functions for guest memory tracing
   3 *
   4 * Copyright (C) 2016 Lluís Vilanova <vilanova@ac.upc.edu>
   5 *
   6 * This work is licensed under the terms of the GNU GPL, version 2 or later.
   7 * See the COPYING file in the top-level directory.
   8 */
   9
  10#ifndef TRACE__MEM_H
  11#define TRACE__MEM_H
  12
  13#include "tcg/tcg.h"
  14
  15#define TRACE_MEM_SZ_SHIFT_MASK 0xf /* size shift mask */
  16#define TRACE_MEM_SE (1ULL << 4)    /* sign extended (y/n) */
  17#define TRACE_MEM_BE (1ULL << 5)    /* big endian (y/n) */
  18#define TRACE_MEM_ST (1ULL << 6)    /* store (y/n) */
  19#define TRACE_MEM_MMU_SHIFT 8       /* mmu idx */
  20
  21/**
  22 * trace_mem_build_info:
  23 *
  24 * Return a value for the 'info' argument in guest memory access traces.
  25 */
  26static inline uint16_t trace_mem_build_info(int size_shift, bool sign_extend,
  27                                            MemOp endianness, bool store,
  28                                            unsigned int mmu_idx)
  29{
  30    uint16_t res;
  31
  32    res = size_shift & TRACE_MEM_SZ_SHIFT_MASK;
  33    if (sign_extend) {
  34        res |= TRACE_MEM_SE;
  35    }
  36    if (endianness == MO_BE) {
  37        res |= TRACE_MEM_BE;
  38    }
  39    if (store) {
  40        res |= TRACE_MEM_ST;
  41    }
  42#ifdef CONFIG_SOFTMMU
  43    res |= mmu_idx << TRACE_MEM_MMU_SHIFT;
  44#endif
  45    return res;
  46}
  47
  48
  49/**
  50 * trace_mem_get_info:
  51 *
  52 * Return a value for the 'info' argument in guest memory access traces.
  53 */
  54static inline uint16_t trace_mem_get_info(MemOp op,
  55                                          unsigned int mmu_idx,
  56                                          bool store)
  57{
  58    return trace_mem_build_info(op & MO_SIZE, !!(op & MO_SIGN),
  59                                op & MO_BSWAP, store,
  60                                mmu_idx);
  61}
  62
  63#endif /* TRACE__MEM_H */
  64