ffc5089196
Some uses of kallsyms_lookup() do not need to find out the name of a symbol and its module's name it belongs. This is specially true in arch specific code, which needs to unwind the stack to show the back trace during oops (mips is an example). In this specific case, we just need to retreive the function's size and the offset of the active intruction inside it. Adds a new entry "kallsyms_lookup_size_offset()" This new entry does exactly the same as kallsyms_lookup() but does not require any buffers to store any names. It returns 0 if it fails otherwise 1. Signed-off-by: Franck Bui-Huu <vagabon.xyz@gmail.com> Cc: Rusty Russell <rusty@rustcorp.com.au> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
92 lines
2.4 KiB
C
92 lines
2.4 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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#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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/* Replace "%s" in format with address, if found */
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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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/* 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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