root/Whitix/trunk/kernel/symbols.c

/*  This file is part of Whitix.
 *
 *  Whitix is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  Whitix is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with Whitix; if not, write to the Free Software
 *  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 *
 */

#include <config.h>
#include <console.h>
#include <elf.h>
#include <module.h>
#include <sections.h>
#include <symbols.h>
#include <print.h>

#ifdef CONFIG_ALL_SYMBOLS

#define KERNEL_BASE_ADDRESS             0x100000
#define DATA __attribute__((section(".data")))

static struct ElfSymbol* symTable DATA;
static int symTableSize DATA;
static char* strTable DATA;
static int strTableSize DATA;

const char* SymbolLookup(char* stringTable, struct ElfSymbol* symbolTable, int symSize, DWORD address, DWORD* size, DWORD* offset)
{
        DWORD i=0;
        struct ElfSymbol* currSym=NULL;
        struct ElfSymbol* symbol=NULL;
        DWORD currOffset=~0;

        while (i < (symSize/sizeof(struct ElfSymbol)))
        {
                symbol=&symbolTable[i++];

                if (ELF_ST_TYPE(symbol->symInfo) != STT_FUNC)
                        continue;

                if (address-symbol->symValue > currOffset)
                        continue;

                currOffset=address-symbol->symValue;

                currSym=symbol;
        }

        if (!currSym)
                return NULL;

        *offset=currOffset;
        *size=currSym->symSize;

        if (*offset > *size)
                return NULL;

        return stringTable+currSym->symName;
}

void SymbolPrint(DWORD address)
{
        DWORD size, offset;
        const char* name;

        name = SymbolLookup(strTable, symTable, symTableSize, address, &size, &offset);

        if (name)
                KePrint("%s+%#X/%#X\n", name, offset, size);
        else
                KePrint("%#X\n", address);
}

SYMBOL_EXPORT(SymbolPrint);

void SymbolsCopy()
{
        DWORD sectionAddr, numEntries;
        struct ElfSectionHeader* sectionHeaders;
        int i;
        
        EarlyConsoleInit();
        ArchGetSectionInfo(&sectionAddr, &numEntries);
        
        sectionHeaders=(struct ElfSectionHeader*)sectionAddr;

        /* Search the section headers for the symbol and string tables. */
        for (i=1; i<numEntries; i++)
        {
                struct ElfSectionHeader* curr=&sectionHeaders[i];
                
                if (curr->shType == SEC_TYPE_SYMTAB)
                {
                        symTable=(struct ElfSymbol*)(curr->shAddr);
                        symTableSize=curr->shSize;
                }else if (curr->shType == SEC_TYPE_STRTAB)
                {
                        strTable=(char*)(curr->shAddr);
                        strTableSize=curr->shSize;
                }
        }
}

#else
/* Stub functions. */

void SymbolPrint(DWORD address)
{
        KePrint("%10X\n", address);
}

void SymbolsCopy()
{
}

#endif