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165 lines
4.1 KiB
165 lines
4.1 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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/* Rewritten and vastly simplified by Rusty Russell for in-kernel |
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* module loader: |
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* Copyright 2002 Rusty Russell <[email protected]> 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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#include <linux/errno.h> |
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#include <linux/kernel.h> |
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#include <linux/stddef.h> |
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#include <linux/mm.h> |
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#include <linux/module.h> |
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#include <asm/sections.h> |
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#define KSYM_NAME_LEN 128 |
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#define KSYM_SYMBOL_LEN (sizeof("%s+%#lx/%#lx [%s]") + (KSYM_NAME_LEN - 1) + \ |
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2*(BITS_PER_LONG*3/10) + (MODULE_NAME_LEN - 1) + 1) |
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struct cred; |
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struct module; |
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static inline int is_kernel_inittext(unsigned long addr) |
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{ |
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if (addr >= (unsigned long)_sinittext |
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&& addr <= (unsigned long)_einittext) |
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return 1; |
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return 0; |
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} |
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static inline int is_kernel_text(unsigned long addr) |
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{ |
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if ((addr >= (unsigned long)_stext && addr <= (unsigned long)_etext) || |
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arch_is_kernel_text(addr)) |
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return 1; |
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return in_gate_area_no_mm(addr); |
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} |
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static inline int is_kernel(unsigned long addr) |
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{ |
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if (addr >= (unsigned long)_stext && addr <= (unsigned long)_end) |
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return 1; |
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return in_gate_area_no_mm(addr); |
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} |
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static inline int is_ksym_addr(unsigned long addr) |
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{ |
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if (IS_ENABLED(CONFIG_KALLSYMS_ALL)) |
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return is_kernel(addr); |
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return is_kernel_text(addr) || is_kernel_inittext(addr); |
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} |
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static inline void *dereference_symbol_descriptor(void *ptr) |
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{ |
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#ifdef HAVE_DEREFERENCE_FUNCTION_DESCRIPTOR |
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struct module *mod; |
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ptr = dereference_kernel_function_descriptor(ptr); |
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if (is_ksym_addr((unsigned long)ptr)) |
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return ptr; |
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preempt_disable(); |
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mod = __module_address((unsigned long)ptr); |
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preempt_enable(); |
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if (mod) |
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ptr = dereference_module_function_descriptor(mod, ptr); |
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#endif |
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return ptr; |
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} |
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int kallsyms_on_each_symbol(int (*fn)(void *, const char *, struct module *, |
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unsigned long), |
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void *data); |
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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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extern int sprint_symbol_no_offset(char *buffer, unsigned long address); |
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extern int sprint_backtrace(char *buffer, unsigned long address); |
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int lookup_symbol_name(unsigned long addr, char *symname); |
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int lookup_symbol_attrs(unsigned long addr, unsigned long *size, unsigned long *offset, char *modname, char *name); |
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/* How and when do we show kallsyms values? */ |
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extern bool kallsyms_show_value(const struct cred *cred); |
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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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static inline int sprint_symbol_no_offset(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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static inline int sprint_backtrace(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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static inline int lookup_symbol_name(unsigned long addr, char *symname) |
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{ |
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return -ERANGE; |
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} |
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static inline int lookup_symbol_attrs(unsigned long addr, unsigned long *size, unsigned long *offset, char *modname, char *name) |
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{ |
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return -ERANGE; |
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} |
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static inline bool kallsyms_show_value(const struct cred *cred) |
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{ |
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return false; |
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} |
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#endif /*CONFIG_KALLSYMS*/ |
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static inline void print_ip_sym(const char *loglvl, unsigned long ip) |
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{ |
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printk("%s[<%px>] %pS\n", loglvl, (void *) ip, (void *) ip); |
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} |
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#endif /*_LINUX_KALLSYMS_H*/
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