42e380832a
Today's print_symbol function dumps a kernel symbol with printk. This patch extends the functionality of kallsyms.c so that the symbol lookup function may be used without the printk. This is useful for modules that want to dump symbols elsewhere, for example, to debugfs. I intend to use the new function call in the GFS2 file system (which will be a separate patch). [akpm@linux-foundation.org: build fix] [clameter@sgi.com: sprint_symbol should return length of string like sprintf] Signed-off-by: Robert Peterson <rpeterso@redhat.com> Cc: Rusty Russell <rusty@rustcorp.com.au> Cc: Roman Zippel <zippel@linux-m68k.org> Cc: "Randy.Dunlap" <rdunlap@xenotime.net> Cc: Sam Ravnborg <sam@ravnborg.org> Acked-by: Paulo Marques <pmarques@grupopie.com> Signed-off-by: Christoph Lameter <clameter@sgi.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
104 lines
2.8 KiB
C
104 lines
2.8 KiB
C
/* Rewritten and vastly simplified by Rusty Russell for in-kernel
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* module loader:
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* Copyright 2002 Rusty Russell <rusty@rustcorp.com.au> IBM Corporation
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*/
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#ifndef _LINUX_KALLSYMS_H
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#define _LINUX_KALLSYMS_H
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#define KSYM_NAME_LEN 127
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#define KSYM_SYMBOL_LEN (sizeof("%s+%#lx/%#lx [%s]") + KSYM_NAME_LEN + \
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2*(BITS_PER_LONG*3/10) + MODULE_NAME_LEN + 1)
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#ifdef CONFIG_KALLSYMS
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/* Lookup the address for a symbol. Returns 0 if not found. */
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unsigned long kallsyms_lookup_name(const char *name);
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extern int kallsyms_lookup_size_offset(unsigned long addr,
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unsigned long *symbolsize,
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unsigned long *offset);
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/* Lookup an address. modname is set to NULL if it's in the kernel. */
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const char *kallsyms_lookup(unsigned long addr,
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unsigned long *symbolsize,
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unsigned long *offset,
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char **modname, char *namebuf);
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/* Look up a kernel symbol and return it in a text buffer. */
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extern int sprint_symbol(char *buffer, unsigned long address);
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/* Look up a kernel symbol and print it to the kernel messages. */
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extern void __print_symbol(const char *fmt, unsigned long address);
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#else /* !CONFIG_KALLSYMS */
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static inline unsigned long kallsyms_lookup_name(const char *name)
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{
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return 0;
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}
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static inline int kallsyms_lookup_size_offset(unsigned long addr,
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unsigned long *symbolsize,
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unsigned long *offset)
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{
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return 0;
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}
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static inline const char *kallsyms_lookup(unsigned long addr,
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unsigned long *symbolsize,
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unsigned long *offset,
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char **modname, char *namebuf)
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{
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return NULL;
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}
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static inline int sprint_symbol(char *buffer, unsigned long addr)
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{
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*buffer = '\0';
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return 0;
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}
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/* Stupid that this does nothing, but I didn't create this mess. */
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#define __print_symbol(fmt, addr)
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#endif /*CONFIG_KALLSYMS*/
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/* This macro allows us to keep printk typechecking */
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static void __check_printsym_format(const char *fmt, ...)
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__attribute__((format(printf,1,2)));
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static inline void __check_printsym_format(const char *fmt, ...)
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{
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}
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/* ia64 and ppc64 use function descriptors, which contain the real address */
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#if defined(CONFIG_IA64) || defined(CONFIG_PPC64)
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#define print_fn_descriptor_symbol(fmt, addr) \
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do { \
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unsigned long *__faddr = (unsigned long*) addr; \
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print_symbol(fmt, __faddr[0]); \
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} while (0)
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#else
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#define print_fn_descriptor_symbol(fmt, addr) print_symbol(fmt, addr)
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#endif
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static inline void print_symbol(const char *fmt, unsigned long addr)
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{
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__check_printsym_format(fmt, "");
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__print_symbol(fmt, (unsigned long)
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__builtin_extract_return_addr((void *)addr));
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}
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#ifndef CONFIG_64BIT
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#define print_ip_sym(ip) \
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do { \
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printk("[<%08lx>]", ip); \
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print_symbol(" %s\n", ip); \
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} while(0)
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#else
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#define print_ip_sym(ip) \
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do { \
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printk("[<%016lx>]", ip); \
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print_symbol(" %s\n", ip); \
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} while(0)
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#endif
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#endif /*_LINUX_KALLSYMS_H*/
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