FreeBSD/Linux Kernel Cross Reference
sys/xen/interface/gcov.h

     /******************************************************************************
      * gcov.h
      *
      * Coverage structures exported by Xen.
      * Structure is different from Gcc one.
      *
      * Permission is hereby granted, free of charge, to any person obtaining a copy
      * of this software and associated documentation files (the "Software"), to
      * deal in the Software without restriction, including without limitation the
     * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
     * sell copies of the Software, and to permit persons to whom the Software is
     * furnished to do so, subject to the following conditions:
     *
     * The above copyright notice and this permission notice shall be included in
     * all copies or substantial portions of the Software.
     *
     * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
     * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
     * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
     * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
     * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
     * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
     * DEALINGS IN THE SOFTWARE.
     *
     * Copyright (c) 2013, Citrix Systems R&D Ltd.
     */
    
    #ifndef __XEN_PUBLIC_GCOV_H__
    #define __XEN_PUBLIC_GCOV_H__ __XEN_PUBLIC_GCOV_H__
    
    #define XENCOV_COUNTERS         5
    #define XENCOV_TAG_BASE         0x58544300u
    #define XENCOV_TAG_FILE         (XENCOV_TAG_BASE+0x46u)
    #define XENCOV_TAG_FUNC         (XENCOV_TAG_BASE+0x66u)
    #define XENCOV_TAG_COUNTER(n)   (XENCOV_TAG_BASE+0x30u+((n)&0xfu))
    #define XENCOV_TAG_END          (XENCOV_TAG_BASE+0x2eu)
    #define XENCOV_IS_TAG_COUNTER(n) \
        ((n) >= XENCOV_TAG_COUNTER(0) && (n) < XENCOV_TAG_COUNTER(XENCOV_COUNTERS))
    #define XENCOV_COUNTER_NUM(n) ((n)-XENCOV_TAG_COUNTER(0))
    
    /*
     * The main structure for the blob is
     * BLOB := FILE.. END
     * FILE := TAG_FILE VERSION STAMP FILENAME COUNTERS FUNCTIONS
     * FILENAME := LEN characters
     *   characters are padded to 32 bit
     * LEN := 32 bit value
     * COUNTERS := TAG_COUNTER(n) NUM COUNTER..
     * NUM := 32 bit valie
     * COUNTER := 64 bit value
     * FUNCTIONS := TAG_FUNC NUM FUNCTION..
     * FUNCTION := IDENT CHECKSUM NUM_COUNTERS
     *
     * All tagged structures are aligned to 8 bytes
     */
    
    /**
     * File information
     * Prefixed with XENCOV_TAG_FILE and a string with filename
     * Aligned to 8 bytes
     */
    struct xencov_file
    {
        uint32_t tag; /* XENCOV_TAG_FILE */
        uint32_t version;
        uint32_t stamp;
        uint32_t fn_len;
        char filename[1];
    };
    
    /**
     * Counters information
     * Prefixed with XENCOV_TAG_COUNTER(n) where n is 0..(XENCOV_COUNTERS-1)
     * Aligned to 8 bytes
     */
    struct xencov_counter
    {
        uint32_t tag; /* XENCOV_TAG_COUNTER(n) */
        uint32_t num;
        uint64_t values[1];
    };
    
    /**
     * Information for each function
     * Number of counter is equal to the number of counter structures got before
     */
    struct xencov_function
    {
        uint32_t ident;
        uint32_t checksum;
        uint32_t num_counters[1];
    };
    
    /**
     * Information for all functions
     * Aligned to 8 bytes
     */
    struct xencov_functions
    {
       uint32_t tag; /* XENCOV_TAG_FUNC */
       uint32_t num;
       struct xencov_function xencov_function[1];
   };
   
   /**
    * Terminator
    */
   struct xencov_end
   {
       uint32_t tag; /* XENCOV_TAG_END */
   };
   
   #endif /* __XEN_PUBLIC_GCOV_H__ */

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