| /* 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/buildid.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 %s]") + \ |
| (KSYM_NAME_LEN - 1) + \ |
| 2*(BITS_PER_LONG*3/10) + (MODULE_NAME_LEN - 1) + \ |
| (BUILD_ID_SIZE_MAX * 2) + 1) |
| |
| struct cred; |
| struct module; |
| |
| static inline int is_kernel_text(unsigned long addr) |
| { |
| if (__is_kernel_text(addr)) |
| return 1; |
| return in_gate_area_no_mm(addr); |
| } |
| |
| static inline int is_kernel(unsigned long addr) |
| { |
| if (__is_kernel(addr)) |
| 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; |
| } |
| |
| int kallsyms_on_each_symbol(int (*fn)(void *, const char *, struct module *, |
| unsigned long), |
| void *data); |
| |
| #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); |
| extern int sprint_symbol_build_id(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); |
| extern int sprint_backtrace_build_id(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_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_build_id(char *buffer, unsigned long address) |
| { |
| *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 sprint_backtrace_build_id(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*/ |