root/include/linux/kallsyms.h

INCLUDED FROM

DEFINITIONS

1. kallsyms_lookup_name
2. kallsyms_lookup_size_offset
3. kallsyms_lookup
4. sprint_symbol
5. lookup_symbol_name
6. lookup_symbol_attrs
7. __check_printsym_format
8. print_symbol
9. print_fn_descriptor_symbol
10. print_ip_sym

/* Rewritten and vastly simplified by Rusty Russell for in-kernel
 * module loader:
 *   Copyright 2002 Rusty Russell <rusty@rustcorp.com.au> IBM Corporation
 */
#ifndef _LINUX_KALLSYMS_H
#define _LINUX_KALLSYMS_H

#include <linux/errno.h>
#include <linux/kernel.h>
#include <linux/stddef.h>

#define KSYM_NAME_LEN 128
#define KSYM_SYMBOL_LEN (sizeof("%s+%#lx/%#lx [%s]") + (KSYM_NAME_LEN - 1) + \
                         2*(BITS_PER_LONG*3/10) + (MODULE_NAME_LEN - 1) + 1)

#ifdef CONFIG_KALLSYMS
/* Lookup the address for a symbol. Returns 0 if not found. */
unsigned long kallsyms_lookup_name(const char *name);

extern int kallsyms_lookup_size_offset(unsigned long addr,
                                  unsigned long *symbolsize,
                                  unsigned long *offset);

/* Lookup an address.  modname is set to NULL if it's in the kernel. */
const char *kallsyms_lookup(unsigned long addr,
                            unsigned long *symbolsize,
                            unsigned long *offset,
                            char **modname, char *namebuf);

/* Look up a kernel symbol and return it in a text buffer. */
extern int sprint_symbol(char *buffer, unsigned long address);

/* Look up a kernel symbol and print it to the kernel messages. */
extern void __print_symbol(const char *fmt, unsigned long address);

int lookup_symbol_name(unsigned long addr, char *symname);
int lookup_symbol_attrs(unsigned long addr, unsigned long *size, unsigned long *offset, char *modname, char *name);

#else /* !CONFIG_KALLSYMS */

static inline unsigned long kallsyms_lookup_name(const char *name)
{
        return 0;
}

static inline int kallsyms_lookup_size_offset(unsigned long addr,
                                              unsigned long *symbolsize,
                                              unsigned long *offset)
{
        return 0;
}

static inline const char *kallsyms_lookup(unsigned long addr,
                                          unsigned long *symbolsize,
                                          unsigned long *offset,
                                          char **modname, char *namebuf)
{
        return NULL;
}

static inline int sprint_symbol(char *buffer, unsigned long addr)
{
        *buffer = '\0';
        return 0;
}

static inline int lookup_symbol_name(unsigned long addr, char *symname)
{
        return -ERANGE;
}

static inline int lookup_symbol_attrs(unsigned long addr, unsigned long *size, unsigned long *offset, char *modname, char *name)
{
        return -ERANGE;
}

/* Stupid that this does nothing, but I didn't create this mess. */
#define __print_symbol(fmt, addr)
#endif /*CONFIG_KALLSYMS*/

/* This macro allows us to keep printk typechecking */
static void __check_printsym_format(const char *fmt, ...)
__attribute__((format(printf,1,2)));
static inline void __check_printsym_format(const char *fmt, ...)
{
}

static inline void print_symbol(const char *fmt, unsigned long addr)
{
        __check_printsym_format(fmt, "");
        __print_symbol(fmt, (unsigned long)
                       __builtin_extract_return_addr((void *)addr));
}

/*
 * Pretty-print a function pointer.
 *
 * ia64 and ppc64 function pointers are really function descriptors,
 * which contain a pointer the real address.
 */
static inline void print_fn_descriptor_symbol(const char *fmt, void *addr)
{
#if defined(CONFIG_IA64) || defined(CONFIG_PPC64)
        addr = *(void **)addr;
#endif
        print_symbol(fmt, (unsigned long)addr);
}

static inline void print_ip_sym(unsigned long ip)
{
        printk("[<%p>] %pS\n", (void *) ip, (void *) ip);
}

#endif /*_LINUX_KALLSYMS_H*/