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Diffstat (limited to '')
| -rw-r--r-- | include/linux/kallsyms.h | 174 |
1 files changed, 174 insertions, 0 deletions
diff --git a/include/linux/kallsyms.h b/include/linux/kallsyms.h new file mode 100644 index 000000000..481273f0c --- /dev/null +++ b/include/linux/kallsyms.h @@ -0,0 +1,174 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* 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> +#include <linux/mm.h> +#include <linux/module.h> + +#include <asm/sections.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) + +struct cred; +struct module; + +static inline int is_kernel_inittext(unsigned long addr) +{ + if (addr >= (unsigned long)_sinittext + && addr <= (unsigned long)_einittext) + return 1; + return 0; +} + +static inline int is_kernel_text(unsigned long addr) +{ + if ((addr >= (unsigned long)_stext && addr <= (unsigned long)_etext) || + arch_is_kernel_text(addr)) + return 1; + return in_gate_area_no_mm(addr); +} + +static inline int is_kernel(unsigned long addr) +{ + if (addr >= (unsigned long)_stext && addr <= (unsigned long)_end) + return 1; + return in_gate_area_no_mm(addr); +} + +static inline int is_ksym_addr(unsigned long addr) +{ + if (IS_ENABLED(CONFIG_KALLSYMS_ALL)) + return is_kernel(addr); + + return is_kernel_text(addr) || is_kernel_inittext(addr); +} + +static inline void *dereference_symbol_descriptor(void *ptr) +{ +#ifdef HAVE_DEREFERENCE_FUNCTION_DESCRIPTOR + struct module *mod; + + ptr = dereference_kernel_function_descriptor(ptr); + if (is_ksym_addr((unsigned long)ptr)) + return ptr; + + preempt_disable(); + mod = __module_address((unsigned long)ptr); + preempt_enable(); + + if (mod) + ptr = dereference_module_function_descriptor(mod, ptr); +#endif + return ptr; +} + +#ifdef CONFIG_KALLSYMS +/* Lookup the address for a symbol. Returns 0 if not found. */ +unsigned long kallsyms_lookup_name(const char *name); + +/* Call a function on each kallsyms symbol in the core kernel */ +int kallsyms_on_each_symbol(int (*fn)(void *, const char *, struct module *, + unsigned long), + void *data); + +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); +extern int sprint_symbol_no_offset(char *buffer, unsigned long address); +extern int sprint_backtrace(char *buffer, 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); + +/* How and when do we show kallsyms values? */ +extern bool kallsyms_show_value(const struct cred *cred); + +#else /* !CONFIG_KALLSYMS */ + +static inline unsigned long kallsyms_lookup_name(const char *name) +{ + return 0; +} + +static inline int kallsyms_on_each_symbol(int (*fn)(void *, const char *, + struct module *, + unsigned long), + void *data) +{ + 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 sprint_symbol_no_offset(char *buffer, unsigned long addr) +{ + *buffer = '\0'; + return 0; +} + +static inline int sprint_backtrace(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; +} + +static inline bool kallsyms_show_value(const struct cred *cred) +{ + return false; +} + +#endif /*CONFIG_KALLSYMS*/ + +static inline void print_ip_sym(const char *loglvl, unsigned long ip) +{ + printk("%s[<%px>] %pS\n", loglvl, (void *) ip, (void *) ip); +} + +#endif /*_LINUX_KALLSYMS_H*/ |