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/*

 * Copyright (c) 2005 Ondrej Palkovsky

 * All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions

 * are met:

 *

 * - Redistributions of source code must retain the above copyright

 *   notice, this list of conditions and the following disclaimer.

 * - Redistributions in binary form must reproduce the above copyright

 *   notice, this list of conditions and the following disclaimer in the

 *   documentation and/or other materials provided with the distribution.

 * - The name of the author may not be used to endorse or promote products

 *   derived from this software without specific prior written permission.

 *

 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR

 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES

 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.

 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,

 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT

 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,

 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY

 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT

 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF

 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

 */

/** @addtogroup genericdebug

 * @{

 */

/**

 * @file

 * @brief   Kernel symbol resolver.

 */

#include <symtab.h>

#include <byteorder.h>

#include <string.h>

#include <print.h>

#include <arch/types.h>

#include <typedefs.h>

#include <errno.h>

/** Get name of symbol that seems most likely to correspond to address.

 *

 * @param addr  Address.

 * @param name  Place to store pointer to the symbol name.

 *

 * @return  Zero on success or negative error code, ENOENT if not found,

 *      ENOTSUP if symbol table not available.

 */

int symtab_name_lookup(unative_t addr, char **name)

{

#ifdef CONFIG_SYMTAB

    count_t i;

    for (i = 1; symbol_table[i].address_le; ++i) {

        if (addr < uint64_t_le2host(symbol_table[i].address_le))

            break;

    }

    if (addr >= uint64_t_le2host(symbol_table[i - 1].address_le)) {

        *name = symbol_table[i - 1].symbol_name;

        return EOK;

    }

    *name = NULL;

    return ENOENT;

#else

    *name = NULL;

    return ENOTSUP;

#endif

}

/** Lookup symbol by address and format for display.

 *

 * Returns name of closest corresponding symbol, "Not found" if none exists

 * or "N/A" if no symbol information is available.

 *

 * @param addr  Address.

 * @param name  Place to store pointer to the symbol name.

 *

 * @return  Pointer to a human-readable string.

 */

char *symtab_fmt_name_lookup(unative_t addr)

{

    int rc;

    char *name;

    rc = symtab_name_lookup(addr, &name);

    switch (rc) {

    case EOK: return name;

    case ENOENT: return "Not found";

    default: return "N/A";

    }

}

#ifdef CONFIG_SYMTAB

/** Find symbols that match the parameter forward and print them.

 *

 * @param name - search string

 * @param startpos - starting position, changes to found position

 * @return Pointer to the part of string that should be completed or NULL

 */

static char * symtab_search_one(const char *name, int *startpos)

{

    unsigned int namelen = strlen(name);

    char *curname;

    int i, j;

    int colonoffset = -1;

    for (i = 0; name[i]; i++)

        if (name[i] == ':') {

            colonoffset = i;

            break;

        }

    for (i = *startpos; symbol_table[i].address_le; ++i) {

        /* Find a ':' in name */

        curname = symbol_table[i].symbol_name;

        for (j = 0; curname[j] && curname[j] != ':'; j++)

            ;

        if (!curname[j])

            continue;

        j -= colonoffset;

        curname += j;

        if (strlen(curname) < namelen)

            continue;

        if (strncmp(curname, name, namelen) == 0) {

            *startpos = i;

            return curname + namelen;

        }

    }

    return NULL;

}

#endif

/** Return address that corresponds to the entry

 *

 * Search symbol table, and if there is one match, return it

 *

 * @param name  Name of the symbol

 * @param addr  Place to store symbol address

 *

 * @return  Zero on success, ENOENT - not found, EOVERFLOW - duplicate

 *      symbol, ENOTSUP - no symbol information available.

 */

int symtab_addr_lookup(const char *name, uintptr_t *addr)

{

#ifdef CONFIG_SYMTAB

    count_t found = 0;

    char *hint;

    int i;

    i = 0;

    while ((hint = symtab_search_one(name, &i))) {

        if (!strlen(hint)) {

            *addr =  uint64_t_le2host(symbol_table[i].address_le);

            found++;

        }

        i++;

    }

    if (found > 1)

        return EOVERFLOW;

    if (found < 1)

        return ENOENT;

    return EOK;

#else

    return ENOTSUP;

#endif

}

/** Find symbols that match parameter and prints them */

void symtab_print_search(const char *name)

{

#ifdef CONFIG_SYMTAB

    int i;

    uintptr_t addr;

    char *realname;

    i = 0;

    while (symtab_search_one(name, &i)) {

        addr =  uint64_t_le2host(symbol_table[i].address_le);

        realname = symbol_table[i].symbol_name;

        printf("%p: %s\n", addr, realname);

        i++;

    }

#else

    printf("No symbol information available.\n");

#endif

}

/** Symtab completion

 *

 * @param input - Search string, completes to symbol name

 * @returns - 0 - nothing found, 1 - success, >1 print duplicates

 */

int symtab_compl(char *input)

{

#ifdef CONFIG_SYMTAB

    char output[MAX_SYMBOL_NAME + 1];

    int startpos = 0;

    char *foundtxt;

    int found = 0;

    int i;

    char *name = input;

    /* Allow completion of pointers  */

    if (name[0] == '*' || name[0] == '&')

        name++;

    /* Do not print everything */

    if (!strlen(name))

        return 0;

    output[0] = '\0';

    while ((foundtxt = symtab_search_one(name, &startpos))) {

        startpos++;

        if (!found)

            strncpy(output, foundtxt, strlen(foundtxt) + 1);

        else {

            for (i = 0; output[i] && foundtxt[i] &&

                 output[i] == foundtxt[i]; i++)

                ;

            output[i] = '\0';

        }

        found++;

    }

    if (!found)

        return 0;

    if (found > 1 && !strlen(output)) {

        printf("\n");

        startpos = 0;

        while ((foundtxt = symtab_search_one(name, &startpos))) {

            printf("%s\n", symbol_table[startpos].symbol_name);

            startpos++;

        }

    }

    strncpy(input, output, MAX_SYMBOL_NAME);

    return found;

#else

    return 0;

#endif

}

/** @}

 */