source: mainline/kernel/generic/src/debug/symtab.c@ 4ccdcf6

/*
 * 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
}

/** @}
 */