kvisc/vm/pc/sym.c

// The OS/K Team licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.

#include <pc/arch.h>

sym_t symtab[SYMTAB_LEN] = { 0 };

int create_symtab(const char *name)
{
    FILE *tab = fopen(name, "r");
    ulong addr, prev_addr = 0;
    char buf[SYMLEN_MAX] = { 0 };
    size_t it = 0;

    if (!tab)
    {
        log("Couldn't open symtab\n");
        return -1;
    }

    while (fscanf(tab, "%s %lu\n", buf, &addr) > 0 && it < SYMTAB_LEN)
    {
        // log("SYM: '%.*s' '%lu'\n", SYMLEN_MAX, buf, addr);

        if (prev_addr >= addr)
        {
            log("Symbol addresses in symbol table not in increasing order\n");
            log("Previous symbol: '%s' '%lu'\n", symtab[it-1].name, prev_addr);
            log("Current symbol: '%s' '%lu'\n", buf, addr);
            exit(-55);
        }

        prev_addr = addr;

        symtab[it].addr = addr;
        strcpy(symtab[it].name, buf);
        it++;
    }

    fclose(tab);
	
    return 0;
}

sym_t *find_sym_by_addr(ulong addr)
{
    ulong it;
    sym_t *sym;

    for (it = 0; it < SYMTAB_LEN; it++)
    {
        sym = &symtab[it];

        if (sym->addr == addr)
            return sym;

        // Addresses in symtab are in increasing order
        if (sym->addr == 0 || sym->addr > addr)
            return NULL;
    }

    return NULL;
}