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  */
  26 static 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  */
  54 static 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 */