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#ifndef _LINUX_FTRACE_H#define _LINUX_FTRACE_H
#include <linux/trace_recursion.h>#include <linux/trace_clock.h>#include <linux/jump_label.h>#include <linux/kallsyms.h>#include <linux/linkage.h>#include <linux/bitops.h>#include <linux/ptrace.h>#include <linux/ktime.h>#include <linux/sched.h>#include <linux/types.h>#include <linux/init.h>#include <linux/fs.h>
#include <asm/ftrace.h>
/* * If the arch supports passing the variable contents of * function_trace_op as the third parameter back from the * mcount call, then the arch should define this as 1. */#ifndef ARCH_SUPPORTS_FTRACE_OPS#define ARCH_SUPPORTS_FTRACE_OPS 0#endif
#ifdef CONFIG_TRACER_SNAPSHOTextern void ftrace_boot_snapshot(void);#elsestatic inline void ftrace_boot_snapshot(void) { }#endif
struct ftrace_ops;struct ftrace_regs;struct dyn_ftrace;
char *arch_ftrace_match_adjust(char *str, const char *search);
#ifdef CONFIG_HAVE_FUNCTION_GRAPH_FREGSunsigned long ftrace_return_to_handler(struct ftrace_regs *fregs);#elseunsigned long ftrace_return_to_handler(unsigned long frame_pointer);#endif
#ifdef CONFIG_FUNCTION_TRACER/* * If the arch's mcount caller does not support all of ftrace's * features, then it must call an indirect function that * does. Or at least does enough to prevent any unwelcome side effects. * * Also define the function prototype that these architectures use * to call the ftrace_ops_list_func(). */#if !ARCH_SUPPORTS_FTRACE_OPS# define FTRACE_FORCE_LIST_FUNC 1void arch_ftrace_ops_list_func(unsigned long ip, unsigned long parent_ip);#else# define FTRACE_FORCE_LIST_FUNC 0void arch_ftrace_ops_list_func(unsigned long ip, unsigned long parent_ip, struct ftrace_ops *op, struct ftrace_regs *fregs);#endifextern const struct ftrace_ops ftrace_nop_ops;extern const struct ftrace_ops ftrace_list_ops;struct ftrace_ops *ftrace_find_unique_ops(struct dyn_ftrace *rec);#endif /* CONFIG_FUNCTION_TRACER */
/* Main tracing buffer and events set up */#ifdef CONFIG_TRACINGvoid trace_init(void);void early_trace_init(void);#elsestatic inline void trace_init(void) { }static inline void early_trace_init(void) { }#endif
struct module;struct ftrace_hash;struct ftrace_func_entry;
#if defined(CONFIG_FUNCTION_TRACER) && defined(CONFIG_MODULES) && \ defined(CONFIG_DYNAMIC_FTRACE)intftrace_mod_address_lookup(unsigned long addr, unsigned long *size, unsigned long *off, char **modname, const unsigned char **modbuildid, char *sym);#elsestatic inline intftrace_mod_address_lookup(unsigned long addr, unsigned long *size, unsigned long *off, char **modname, const unsigned char **modbuildid, char *sym){ return 0;}#endif
#if defined(CONFIG_FUNCTION_TRACER) && defined(CONFIG_DYNAMIC_FTRACE)int ftrace_mod_get_kallsym(unsigned int symnum, unsigned long *value, char *type, char *name, char *module_name, int *exported);#elsestatic inline int ftrace_mod_get_kallsym(unsigned int symnum, unsigned long *value, char *type, char *name, char *module_name, int *exported){ return -1;}#endif
#ifdef CONFIG_FUNCTION_TRACER
#include <linux/ftrace_regs.h>
extern int ftrace_enabled;
/** * ftrace_regs - ftrace partial/optimal register set * * ftrace_regs represents a group of registers which is used at the * function entry and exit. There are three types of registers. * * - Registers for passing the parameters to callee, including the stack * pointer. (e.g. rcx, rdx, rdi, rsi, r8, r9 and rsp on x86_64) * - Registers for passing the return values to caller. * (e.g. rax and rdx on x86_64) * - Registers for hooking the function call and return including the * frame pointer (the frame pointer is architecture/config dependent) * (e.g. rip, rbp and rsp for x86_64) * * Also, architecture dependent fields can be used for internal process. * (e.g. orig_ax on x86_64) * * Basically, ftrace_regs stores the registers related to the context. * On function entry, registers for function parameters and hooking the * function call are stored, and on function exit, registers for function * return value and frame pointers are stored. * * And also, it dpends on the context that which registers are restored * from the ftrace_regs. * On the function entry, those registers will be restored except for * the stack pointer, so that user can change the function parameters * and instruction pointer (e.g. live patching.) * On the function exit, only registers which is used for return values * are restored. * * NOTE: user *must not* access regs directly, only do it via APIs, because * the member can be changed according to the architecture. * This is why the structure is empty here, so that nothing accesses * the ftrace_regs directly. */struct ftrace_regs { /* Nothing to see here, use the accessor functions! */};
#define ftrace_regs_size() sizeof(struct __arch_ftrace_regs)
#ifndef CONFIG_HAVE_DYNAMIC_FTRACE_WITH_ARGS/* * Architectures that define HAVE_DYNAMIC_FTRACE_WITH_ARGS must define their own * arch_ftrace_get_regs() where it only returns pt_regs *if* it is fully * populated. It should return NULL otherwise. */static inline struct pt_regs *arch_ftrace_get_regs(struct ftrace_regs *fregs){ return &arch_ftrace_regs(fregs)->regs;}
/* * ftrace_regs_set_instruction_pointer() is to be defined by the architecture * if to allow setting of the instruction pointer from the ftrace_regs when * HAVE_DYNAMIC_FTRACE_WITH_ARGS is set and it supports live kernel patching. */#define ftrace_regs_set_instruction_pointer(fregs, ip) do { } while (0)#endif /* CONFIG_HAVE_DYNAMIC_FTRACE_WITH_ARGS */
#ifdef CONFIG_HAVE_FTRACE_REGS_HAVING_PT_REGS
static_assert(sizeof(struct pt_regs) == ftrace_regs_size());
#endif /* CONFIG_HAVE_FTRACE_REGS_HAVING_PT_REGS */
static __always_inline struct pt_regs *ftrace_get_regs(struct ftrace_regs *fregs){ if (!fregs) return NULL;
return arch_ftrace_get_regs(fregs);}
#if !defined(CONFIG_HAVE_DYNAMIC_FTRACE_WITH_ARGS) || \ defined(CONFIG_HAVE_FTRACE_REGS_HAVING_PT_REGS)
#ifndef arch_ftrace_partial_regs#define arch_ftrace_partial_regs(regs) do {} while (0)#endif
static __always_inline struct pt_regs *ftrace_partial_regs(struct ftrace_regs *fregs, struct pt_regs *regs){ /* * If CONFIG_HAVE_FTRACE_REGS_HAVING_PT_REGS=y, ftrace_regs memory * layout is including pt_regs. So always returns that address. * Since arch_ftrace_get_regs() will check some members and may return * NULL, we can not use it. */ regs = &arch_ftrace_regs(fregs)->regs;
/* Allow arch specific updates to regs. */ arch_ftrace_partial_regs(regs); return regs;}
#endif /* !CONFIG_HAVE_DYNAMIC_FTRACE_WITH_ARGS || CONFIG_HAVE_FTRACE_REGS_HAVING_PT_REGS */
#ifdef CONFIG_HAVE_DYNAMIC_FTRACE_WITH_ARGS
/* * Please define arch dependent pt_regs which compatible to the * perf_arch_fetch_caller_regs() but based on ftrace_regs. * This requires * - user_mode(_regs) returns false (always kernel mode). * - able to use the _regs for stack trace. */#ifndef arch_ftrace_fill_perf_regs/* As same as perf_arch_fetch_caller_regs(), do nothing by default */#define arch_ftrace_fill_perf_regs(fregs, _regs) do {} while (0)#endif
static __always_inline struct pt_regs *ftrace_fill_perf_regs(struct ftrace_regs *fregs, struct pt_regs *regs){ arch_ftrace_fill_perf_regs(fregs, regs); return regs;}
#else /* !CONFIG_HAVE_DYNAMIC_FTRACE_WITH_ARGS */
static __always_inline struct pt_regs *ftrace_fill_perf_regs(struct ftrace_regs *fregs, struct pt_regs *regs){ return &arch_ftrace_regs(fregs)->regs;}
#endif
/* * When true, the ftrace_regs_{get,set}_*() functions may be used on fregs. * Note: this can be true even when ftrace_get_regs() cannot provide a pt_regs. */static __always_inline bool ftrace_regs_has_args(struct ftrace_regs *fregs){ if (IS_ENABLED(CONFIG_HAVE_DYNAMIC_FTRACE_WITH_ARGS)) return true;
return ftrace_get_regs(fregs) != NULL;}
#ifdef CONFIG_HAVE_REGS_AND_STACK_ACCESS_APIstatic __always_inline unsigned longftrace_regs_get_kernel_stack_nth(struct ftrace_regs *fregs, unsigned int nth){ unsigned long *stackp;
stackp = (unsigned long *)ftrace_regs_get_stack_pointer(fregs); if (((unsigned long)(stackp + nth) & ~(THREAD_SIZE - 1)) == ((unsigned long)stackp & ~(THREAD_SIZE - 1))) return *(stackp + nth);
return 0;}#else /* !CONFIG_HAVE_REGS_AND_STACK_ACCESS_API */#define ftrace_regs_get_kernel_stack_nth(fregs, nth) (0L)#endif /* CONFIG_HAVE_REGS_AND_STACK_ACCESS_API */
typedef void (*ftrace_func_t)(unsigned long ip, unsigned long parent_ip, struct ftrace_ops *op, struct ftrace_regs *fregs);
ftrace_func_t ftrace_ops_get_func(struct ftrace_ops *ops);
/* * FTRACE_OPS_FL_* bits denote the state of ftrace_ops struct and are * set in the flags member. * CONTROL, SAVE_REGS, SAVE_REGS_IF_SUPPORTED, RECURSION, STUB and * IPMODIFY are a kind of attribute flags which can be set only before * registering the ftrace_ops, and can not be modified while registered. * Changing those attribute flags after registering ftrace_ops will * cause unexpected results. * * ENABLED - set/unset when ftrace_ops is registered/unregistered * DYNAMIC - set when ftrace_ops is registered to denote dynamically * allocated ftrace_ops which need special care * SAVE_REGS - The ftrace_ops wants regs saved at each function called * and passed to the callback. If this flag is set, but the * architecture does not support passing regs * (CONFIG_DYNAMIC_FTRACE_WITH_REGS is not defined), then the * ftrace_ops will fail to register, unless the next flag * is set. * SAVE_REGS_IF_SUPPORTED - This is the same as SAVE_REGS, but if the * handler can handle an arch that does not save regs * (the handler tests if regs == NULL), then it can set * this flag instead. It will not fail registering the ftrace_ops * but, the regs field will be NULL if the arch does not support * passing regs to the handler. * Note, if this flag is set, the SAVE_REGS flag will automatically * get set upon registering the ftrace_ops, if the arch supports it. * RECURSION - The ftrace_ops can set this to tell the ftrace infrastructure * that the call back needs recursion protection. If it does * not set this, then the ftrace infrastructure will assume * that the callback can handle recursion on its own. * STUB - The ftrace_ops is just a place holder. * INITIALIZED - The ftrace_ops has already been initialized (first use time * register_ftrace_function() is called, it will initialized the ops) * DELETED - The ops are being deleted, do not let them be registered again. * ADDING - The ops is in the process of being added. * REMOVING - The ops is in the process of being removed. * MODIFYING - The ops is in the process of changing its filter functions. * ALLOC_TRAMP - A dynamic trampoline was allocated by the core code. * The arch specific code sets this flag when it allocated a * trampoline. This lets the arch know that it can update the * trampoline in case the callback function changes. * The ftrace_ops trampoline can be set by the ftrace users, and * in such cases the arch must not modify it. Only the arch ftrace * core code should set this flag. * IPMODIFY - The ops can modify the IP register. This can only be set with * SAVE_REGS. If another ops with this flag set is already registered * for any of the functions that this ops will be registered for, then * this ops will fail to register or set_filter_ip. * PID - Is affected by set_ftrace_pid (allows filtering on those pids) * RCU - Set when the ops can only be called when RCU is watching. * TRACE_ARRAY - The ops->private points to a trace_array descriptor. * PERMANENT - Set when the ops is permanent and should not be affected by * ftrace_enabled. * DIRECT - Used by the direct ftrace_ops helper for direct functions * (internal ftrace only, should not be used by others) * SUBOP - Is controlled by another op in field managed. * GRAPH - Is a component of the fgraph_ops structure */enum { FTRACE_OPS_FL_ENABLED = BIT(0), FTRACE_OPS_FL_DYNAMIC = BIT(1), FTRACE_OPS_FL_SAVE_REGS = BIT(2), FTRACE_OPS_FL_SAVE_REGS_IF_SUPPORTED = BIT(3), FTRACE_OPS_FL_RECURSION = BIT(4), FTRACE_OPS_FL_STUB = BIT(5), FTRACE_OPS_FL_INITIALIZED = BIT(6), FTRACE_OPS_FL_DELETED = BIT(7), FTRACE_OPS_FL_ADDING = BIT(8), FTRACE_OPS_FL_REMOVING = BIT(9), FTRACE_OPS_FL_MODIFYING = BIT(10), FTRACE_OPS_FL_ALLOC_TRAMP = BIT(11), FTRACE_OPS_FL_IPMODIFY = BIT(12), FTRACE_OPS_FL_PID = BIT(13), FTRACE_OPS_FL_RCU = BIT(14), FTRACE_OPS_FL_TRACE_ARRAY = BIT(15), FTRACE_OPS_FL_PERMANENT = BIT(16), FTRACE_OPS_FL_DIRECT = BIT(17), FTRACE_OPS_FL_SUBOP = BIT(18), FTRACE_OPS_FL_GRAPH = BIT(19),};
#ifndef CONFIG_DYNAMIC_FTRACE_WITH_ARGS#define FTRACE_OPS_FL_SAVE_ARGS FTRACE_OPS_FL_SAVE_REGS#else#define FTRACE_OPS_FL_SAVE_ARGS 0#endif
/* * FTRACE_OPS_CMD_* commands allow the ftrace core logic to request changes * to a ftrace_ops. Note, the requests may fail. * * ENABLE_SHARE_IPMODIFY_SELF - enable a DIRECT ops to work on the same * function as an ops with IPMODIFY. Called * when the DIRECT ops is being registered. * This is called with both direct_mutex and * ftrace_lock are locked. * * ENABLE_SHARE_IPMODIFY_PEER - enable a DIRECT ops to work on the same * function as an ops with IPMODIFY. Called * when the other ops (the one with IPMODIFY) * is being registered. * This is called with direct_mutex locked. * * DISABLE_SHARE_IPMODIFY_PEER - disable a DIRECT ops to work on the same * function as an ops with IPMODIFY. Called * when the other ops (the one with IPMODIFY) * is being unregistered. * This is called with direct_mutex locked. */enum ftrace_ops_cmd { FTRACE_OPS_CMD_ENABLE_SHARE_IPMODIFY_SELF, FTRACE_OPS_CMD_ENABLE_SHARE_IPMODIFY_PEER, FTRACE_OPS_CMD_DISABLE_SHARE_IPMODIFY_PEER,};
/* * For most ftrace_ops_cmd, * Returns: * 0 - Success. * Negative on failure. The return value is dependent on the * callback. */typedef int (*ftrace_ops_func_t)(struct ftrace_ops *op, unsigned long ip, enum ftrace_ops_cmd cmd);
#ifdef CONFIG_DYNAMIC_FTRACE
#define FTRACE_HASH_DEFAULT_BITS 10
struct ftrace_hash *alloc_ftrace_hash(int size_bits);void free_ftrace_hash(struct ftrace_hash *hash);struct ftrace_func_entry *add_ftrace_hash_entry_direct(struct ftrace_hash *hash, unsigned long ip, unsigned long direct);void add_ftrace_hash_entry(struct ftrace_hash *hash, struct ftrace_func_entry *entry);void ftrace_hash_remove(struct ftrace_hash *hash);
/* The hash used to know what functions callbacks trace */struct ftrace_ops_hash { struct ftrace_hash __rcu *notrace_hash; struct ftrace_hash __rcu *filter_hash; struct mutex regex_lock;};
void ftrace_free_init_mem(void);void ftrace_free_mem(struct module *mod, void *start, void *end);#elsestatic inline void ftrace_free_init_mem(void){ ftrace_boot_snapshot();}static inline void ftrace_free_mem(struct module *mod, void *start, void *end) { }#endif
/* * Note, ftrace_ops can be referenced outside of RCU protection, unless * the RCU flag is set. If ftrace_ops is allocated and not part of kernel * core data, the unregistering of it will perform a scheduling on all CPUs * to make sure that there are no more users. Depending on the load of the * system that may take a bit of time. * * Any private data added must also take care not to be freed and if private * data is added to a ftrace_ops that is in core code, the user of the * ftrace_ops must perform a schedule_on_each_cpu() before freeing it. */struct ftrace_ops { ftrace_func_t func; struct ftrace_ops __rcu *next; unsigned long flags; void *private; ftrace_func_t saved_func;#ifdef CONFIG_DYNAMIC_FTRACE struct ftrace_ops_hash local_hash; struct ftrace_ops_hash *func_hash; struct ftrace_ops_hash old_hash; unsigned long trampoline; unsigned long trampoline_size; struct list_head list; struct list_head subop_list; ftrace_ops_func_t ops_func; struct ftrace_ops *managed;#ifdef CONFIG_DYNAMIC_FTRACE_WITH_DIRECT_CALLS unsigned long direct_call;#endif#endif};
extern struct ftrace_ops __rcu *ftrace_ops_list;extern struct ftrace_ops ftrace_list_end;
/* * Traverse the ftrace_ops_list, invoking all entries. The reason that we * can use rcu_dereference_raw_check() is that elements removed from this list * are simply leaked, so there is no need to interact with a grace-period * mechanism. The rcu_dereference_raw_check() calls are needed to handle * concurrent insertions into the ftrace_ops_list. * * Silly Alpha and silly pointer-speculation compiler optimizations! */#define do_for_each_ftrace_op(op, list) \ op = rcu_dereference_raw_check(list); \ do
/* * Optimized for just a single item in the list (as that is the normal case). */#define while_for_each_ftrace_op(op) \ while (likely(op = rcu_dereference_raw_check((op)->next)) && \ unlikely((op) != &ftrace_list_end))
/* * Type of the current tracing. */enum ftrace_tracing_type_t { FTRACE_TYPE_ENTER = 0, /* Hook the call of the function */ FTRACE_TYPE_RETURN, /* Hook the return of the function */};
/* Current tracing type, default is FTRACE_TYPE_ENTER */extern enum ftrace_tracing_type_t ftrace_tracing_type;
/* * The ftrace_ops must be a static and should also * be read_mostly. These functions do modify read_mostly variables * so use them sparely. Never free an ftrace_op or modify the * next pointer after it has been registered. Even after unregistering * it, the next pointer may still be used internally. */int register_ftrace_function(struct ftrace_ops *ops);int unregister_ftrace_function(struct ftrace_ops *ops);
extern void ftrace_stub(unsigned long a0, unsigned long a1, struct ftrace_ops *op, struct ftrace_regs *fregs);
int ftrace_lookup_symbols(const char **sorted_syms, size_t cnt, unsigned long *addrs);#else /* !CONFIG_FUNCTION_TRACER *//* * (un)register_ftrace_function must be a macro since the ops parameter * must not be evaluated. */#define register_ftrace_function(ops) ({ 0; })#define unregister_ftrace_function(ops) ({ 0; })static inline void ftrace_kill(void) { }static inline void ftrace_free_init_mem(void) { }static inline void ftrace_free_mem(struct module *mod, void *start, void *end) { }static inline int ftrace_lookup_symbols(const char **sorted_syms, size_t cnt, unsigned long *addrs){ return -EOPNOTSUPP;}#endif /* CONFIG_FUNCTION_TRACER */
struct ftrace_func_entry { struct hlist_node hlist; unsigned long ip; unsigned long direct; /* for direct lookup only */};
#ifdef CONFIG_DYNAMIC_FTRACE_WITH_DIRECT_CALLSunsigned long ftrace_find_rec_direct(unsigned long ip);int register_ftrace_direct(struct ftrace_ops *ops, unsigned long addr);int unregister_ftrace_direct(struct ftrace_ops *ops, unsigned long addr, bool free_filters);int modify_ftrace_direct(struct ftrace_ops *ops, unsigned long addr);int modify_ftrace_direct_nolock(struct ftrace_ops *ops, unsigned long addr);
int update_ftrace_direct_add(struct ftrace_ops *ops, struct ftrace_hash *hash);int update_ftrace_direct_del(struct ftrace_ops *ops, struct ftrace_hash *hash);int update_ftrace_direct_mod(struct ftrace_ops *ops, struct ftrace_hash *hash, bool do_direct_lock);
void ftrace_stub_direct_tramp(void);
unsigned long ftrace_hash_count(struct ftrace_hash *hash);
#elsestruct ftrace_ops;static inline unsigned long ftrace_find_rec_direct(unsigned long ip){ return 0;}static inline int register_ftrace_direct(struct ftrace_ops *ops, unsigned long addr){ return -ENODEV;}static inline int unregister_ftrace_direct(struct ftrace_ops *ops, unsigned long addr, bool free_filters){ return -ENODEV;}static inline int modify_ftrace_direct(struct ftrace_ops *ops, unsigned long addr){ return -ENODEV;}static inline int modify_ftrace_direct_nolock(struct ftrace_ops *ops, unsigned long addr){ return -ENODEV;}
static inline int update_ftrace_direct_add(struct ftrace_ops *ops, struct ftrace_hash *hash){ return -ENODEV;}
static inline int update_ftrace_direct_del(struct ftrace_ops *ops, struct ftrace_hash *hash){ return -ENODEV;}
static inline int update_ftrace_direct_mod(struct ftrace_ops *ops, struct ftrace_hash *hash, bool do_direct_lock){ return -ENODEV;}
static inline unsigned long ftrace_hash_count(struct ftrace_hash *hash){ return 0;}
/* * This must be implemented by the architecture. * It is the way the ftrace direct_ops helper, when called * via ftrace (because there's other callbacks besides the * direct call), can inform the architecture's trampoline that this * routine has a direct caller, and what the caller is. * * For example, in x86, it returns the direct caller * callback function via the regs->orig_ax parameter. * Then in the ftrace trampoline, if this is set, it makes * the return from the trampoline jump to the direct caller * instead of going back to the function it just traced. */static inline void arch_ftrace_set_direct_caller(struct ftrace_regs *fregs, unsigned long addr) { }#endif /* CONFIG_DYNAMIC_FTRACE_WITH_DIRECT_CALLS */
#ifdef CONFIG_DYNAMIC_FTRACE_WITH_JMPstatic inline bool ftrace_is_jmp(unsigned long addr){ return addr & 1;}
static inline unsigned long ftrace_jmp_set(unsigned long addr){ return addr | 1UL;}
static inline unsigned long ftrace_jmp_get(unsigned long addr){ return addr & ~1UL;}#elsestatic inline bool ftrace_is_jmp(unsigned long addr){ return false;}
static inline unsigned long ftrace_jmp_set(unsigned long addr){ return addr;}
static inline unsigned long ftrace_jmp_get(unsigned long addr){ return addr;}#endif /* CONFIG_DYNAMIC_FTRACE_WITH_JMP */
#ifdef CONFIG_STACK_TRACER
int stack_trace_sysctl(const struct ctl_table *table, int write, void *buffer, size_t *lenp, loff_t *ppos);
/* DO NOT MODIFY THIS VARIABLE DIRECTLY! */DECLARE_PER_CPU(int, disable_stack_tracer);
/** * stack_tracer_disable - temporarily disable the stack tracer * * There's a few locations (namely in RCU) where stack tracing * cannot be executed. This function is used to disable stack * tracing during those critical sections. * * This function must be called with preemption or interrupts * disabled and stack_tracer_enable() must be called shortly after * while preemption or interrupts are still disabled. */static inline void stack_tracer_disable(void){ /* Preemption or interrupts must be disabled */ if (IS_ENABLED(CONFIG_DEBUG_PREEMPT)) WARN_ON_ONCE(!preempt_count() || !irqs_disabled()); this_cpu_inc(disable_stack_tracer);}
/** * stack_tracer_enable - re-enable the stack tracer * * After stack_tracer_disable() is called, stack_tracer_enable() * must be called shortly afterward. */static inline void stack_tracer_enable(void){ if (IS_ENABLED(CONFIG_DEBUG_PREEMPT)) WARN_ON_ONCE(!preempt_count() || !irqs_disabled()); this_cpu_dec(disable_stack_tracer);}#elsestatic inline void stack_tracer_disable(void) { }static inline void stack_tracer_enable(void) { }#endif
enum { FTRACE_UPDATE_CALLS = (1 << 0), FTRACE_DISABLE_CALLS = (1 << 1), FTRACE_UPDATE_TRACE_FUNC = (1 << 2), FTRACE_START_FUNC_RET = (1 << 3), FTRACE_STOP_FUNC_RET = (1 << 4), FTRACE_MAY_SLEEP = (1 << 5),};
/* Arches can override ftrace_get_symaddr() to convert fentry_ip to symaddr. */#ifndef ftrace_get_symaddr/** * ftrace_get_symaddr - return the symbol address from fentry_ip * @fentry_ip: the address of ftrace location * * Get the symbol address from @fentry_ip (fast path). If there is no fast * search path, this returns 0. * User may need to use kallsyms API to find the symbol address. */#define ftrace_get_symaddr(fentry_ip) (0)#endif
void ftrace_sync_ipi(void *data);
#ifdef CONFIG_DYNAMIC_FTRACE
void ftrace_arch_code_modify_prepare(void);void ftrace_arch_code_modify_post_process(void);
enum ftrace_bug_type { FTRACE_BUG_UNKNOWN, FTRACE_BUG_INIT, FTRACE_BUG_NOP, FTRACE_BUG_CALL, FTRACE_BUG_UPDATE,};extern enum ftrace_bug_type ftrace_bug_type;
/* * Archs can set this to point to a variable that holds the value that was * expected at the call site before calling ftrace_bug(). */extern const void *ftrace_expected;
void ftrace_bug(int err, struct dyn_ftrace *rec);
struct seq_file;
extern int ftrace_text_reserved(const void *start, const void *end);
struct ftrace_ops *ftrace_ops_trampoline(unsigned long addr);
bool is_ftrace_trampoline(unsigned long addr);
/* * The dyn_ftrace record's flags field is split into two parts. * the first part which is '0-FTRACE_REF_MAX' is a counter of * the number of callbacks that have registered the function that * the dyn_ftrace descriptor represents. * * The second part is a mask: * ENABLED - the function is being traced * REGS - the record wants the function to save regs * REGS_EN - the function is set up to save regs. * IPMODIFY - the record allows for the IP address to be changed. * DISABLED - the record is not ready to be touched yet * DIRECT - there is a direct function to call * CALL_OPS - the record can use callsite-specific ops * CALL_OPS_EN - the function is set up to use callsite-specific ops * TOUCHED - A callback was added since boot up * MODIFIED - The function had IPMODIFY or DIRECT attached to it * * When a new ftrace_ops is registered and wants a function to save * pt_regs, the rec->flags REGS is set. When the function has been * set up to save regs, the REG_EN flag is set. Once a function * starts saving regs it will do so until all ftrace_ops are removed * from tracing that function. */enum { FTRACE_FL_ENABLED = (1UL << 31), FTRACE_FL_REGS = (1UL << 30), FTRACE_FL_REGS_EN = (1UL << 29), FTRACE_FL_TRAMP = (1UL << 28), FTRACE_FL_TRAMP_EN = (1UL << 27), FTRACE_FL_IPMODIFY = (1UL << 26), FTRACE_FL_DISABLED = (1UL << 25), FTRACE_FL_DIRECT = (1UL << 24), FTRACE_FL_DIRECT_EN = (1UL << 23), FTRACE_FL_CALL_OPS = (1UL << 22), FTRACE_FL_CALL_OPS_EN = (1UL << 21), FTRACE_FL_TOUCHED = (1UL << 20), FTRACE_FL_MODIFIED = (1UL << 19),};
#define FTRACE_REF_MAX_SHIFT 19#define FTRACE_REF_MAX ((1UL << FTRACE_REF_MAX_SHIFT) - 1)
#define ftrace_rec_count(rec) ((rec)->flags & FTRACE_REF_MAX)
struct dyn_ftrace { unsigned long ip; /* address of mcount call-site */ unsigned long flags; struct dyn_arch_ftrace arch;};
int ftrace_set_filter_ip(struct ftrace_ops *ops, unsigned long ip, int remove, int reset);int ftrace_set_filter_ips(struct ftrace_ops *ops, unsigned long *ips, unsigned int cnt, int remove, int reset);int ftrace_set_filter(struct ftrace_ops *ops, unsigned char *buf, int len, int reset);int ftrace_set_notrace(struct ftrace_ops *ops, unsigned char *buf, int len, int reset);void ftrace_set_global_filter(unsigned char *buf, int len, int reset);void ftrace_set_global_notrace(unsigned char *buf, int len, int reset);void ftrace_free_filter(struct ftrace_ops *ops);void ftrace_ops_set_global_filter(struct ftrace_ops *ops);
/* * The FTRACE_UPDATE_* enum is used to pass information back * from the ftrace_update_record() and ftrace_test_record() * functions. These are called by the code update routines * to find out what is to be done for a given function. * * IGNORE - The function is already what we want it to be * MAKE_CALL - Start tracing the function * MODIFY_CALL - Stop saving regs for the function * MAKE_NOP - Stop tracing the function */enum { FTRACE_UPDATE_IGNORE, FTRACE_UPDATE_MAKE_CALL, FTRACE_UPDATE_MODIFY_CALL, FTRACE_UPDATE_MAKE_NOP,};
enum { FTRACE_ITER_FILTER = (1 << 0), FTRACE_ITER_NOTRACE = (1 << 1), FTRACE_ITER_PRINTALL = (1 << 2), FTRACE_ITER_DO_PROBES = (1 << 3), FTRACE_ITER_PROBE = (1 << 4), FTRACE_ITER_MOD = (1 << 5), FTRACE_ITER_ENABLED = (1 << 6), FTRACE_ITER_TOUCHED = (1 << 7), FTRACE_ITER_ADDRS = (1 << 8),};
void arch_ftrace_update_code(int command);void arch_ftrace_update_trampoline(struct ftrace_ops *ops);void *arch_ftrace_trampoline_func(struct ftrace_ops *ops, struct dyn_ftrace *rec);void arch_ftrace_trampoline_free(struct ftrace_ops *ops);
struct ftrace_rec_iter;
struct ftrace_rec_iter *ftrace_rec_iter_start(void);struct ftrace_rec_iter *ftrace_rec_iter_next(struct ftrace_rec_iter *iter);struct dyn_ftrace *ftrace_rec_iter_record(struct ftrace_rec_iter *iter);
#define for_ftrace_rec_iter(iter) \ for (iter = ftrace_rec_iter_start(); \ iter; \ iter = ftrace_rec_iter_next(iter))
int ftrace_update_record(struct dyn_ftrace *rec, bool enable);int ftrace_test_record(struct dyn_ftrace *rec, bool enable);void ftrace_run_stop_machine(int command);unsigned long ftrace_location(unsigned long ip);unsigned long ftrace_location_range(unsigned long start, unsigned long end);unsigned long ftrace_get_addr_new(struct dyn_ftrace *rec);unsigned long ftrace_get_addr_curr(struct dyn_ftrace *rec);
extern ftrace_func_t ftrace_trace_function;struct trace_array;
int ftrace_regex_open(struct trace_array *tr, struct ftrace_ops *ops, int flag, struct inode *inode, struct file *file);ssize_t ftrace_filter_write(struct file *file, const char __user *ubuf, size_t cnt, loff_t *ppos);ssize_t ftrace_notrace_write(struct file *file, const char __user *ubuf, size_t cnt, loff_t *ppos);int ftrace_regex_release(struct inode *inode, struct file *file);
void __initftrace_set_early_filter(struct ftrace_ops *ops, char *buf, int enable);
/* defined in arch */extern int ftrace_dyn_arch_init(void);extern void ftrace_replace_code(int enable);extern int ftrace_update_ftrace_func(ftrace_func_t func);extern void ftrace_caller(void);extern void ftrace_regs_caller(void);extern void ftrace_call(void);extern void ftrace_regs_call(void);extern void mcount_call(void);
void ftrace_modify_all_code(int command);
#ifndef FTRACE_ADDR#define FTRACE_ADDR ((unsigned long)ftrace_caller)#endif
#ifndef FTRACE_GRAPH_ADDR#define FTRACE_GRAPH_ADDR ((unsigned long)ftrace_graph_caller)#endif
#ifndef FTRACE_REGS_ADDR#ifdef CONFIG_DYNAMIC_FTRACE_WITH_REGS# define FTRACE_REGS_ADDR ((unsigned long)ftrace_regs_caller)#else# define FTRACE_REGS_ADDR FTRACE_ADDR#endif#endif
/* * If an arch would like functions that are only traced * by the function graph tracer to jump directly to its own * trampoline, then they can define FTRACE_GRAPH_TRAMP_ADDR * to be that address to jump to. */#ifndef FTRACE_GRAPH_TRAMP_ADDR#define FTRACE_GRAPH_TRAMP_ADDR ((unsigned long) 0)#endif
#ifdef CONFIG_FUNCTION_GRAPH_TRACERextern void ftrace_graph_caller(void);extern int ftrace_enable_ftrace_graph_caller(void);extern int ftrace_disable_ftrace_graph_caller(void);#elsestatic inline int ftrace_enable_ftrace_graph_caller(void) { return 0; }static inline int ftrace_disable_ftrace_graph_caller(void) { return 0; }#endif
/** * ftrace_make_nop - convert code into nop * @mod: module structure if called by module load initialization * @rec: the call site record (e.g. mcount/fentry) * @addr: the address that the call site should be calling * * This is a very sensitive operation and great care needs * to be taken by the arch. The operation should carefully * read the location, check to see if what is read is indeed * what we expect it to be, and then on success of the compare, * it should write to the location. * * The code segment at @rec->ip should be a caller to @addr * * Return must be: * 0 on success * -EFAULT on error reading the location * -EINVAL on a failed compare of the contents * -EPERM on error writing to the location * Any other value will be considered a failure. */extern int ftrace_make_nop(struct module *mod, struct dyn_ftrace *rec, unsigned long addr);
/** * ftrace_need_init_nop - return whether nop call sites should be initialized * * Normally the compiler's -mnop-mcount generates suitable nops, so we don't * need to call ftrace_init_nop() if the code is built with that flag. * Architectures where this is not always the case may define their own * condition. * * Return must be: * 0 if ftrace_init_nop() should be called * Nonzero if ftrace_init_nop() should not be called */
#ifndef ftrace_need_init_nop#define ftrace_need_init_nop() (!__is_defined(CC_USING_NOP_MCOUNT))#endif
/** * ftrace_init_nop - initialize a nop call site * @mod: module structure if called by module load initialization * @rec: the call site record (e.g. mcount/fentry) * * This is a very sensitive operation and great care needs * to be taken by the arch. The operation should carefully * read the location, check to see if what is read is indeed * what we expect it to be, and then on success of the compare, * it should write to the location. * * The code segment at @rec->ip should contain the contents created by * the compiler * * Return must be: * 0 on success * -EFAULT on error reading the location * -EINVAL on a failed compare of the contents * -EPERM on error writing to the location * Any other value will be considered a failure. */#ifndef ftrace_init_nopstatic inline int ftrace_init_nop(struct module *mod, struct dyn_ftrace *rec){ return ftrace_make_nop(mod, rec, MCOUNT_ADDR);}#endif
/** * ftrace_make_call - convert a nop call site into a call to addr * @rec: the call site record (e.g. mcount/fentry) * @addr: the address that the call site should call * * This is a very sensitive operation and great care needs * to be taken by the arch. The operation should carefully * read the location, check to see if what is read is indeed * what we expect it to be, and then on success of the compare, * it should write to the location. * * The code segment at @rec->ip should be a nop * * Return must be: * 0 on success * -EFAULT on error reading the location * -EINVAL on a failed compare of the contents * -EPERM on error writing to the location * Any other value will be considered a failure. */extern int ftrace_make_call(struct dyn_ftrace *rec, unsigned long addr);
#if defined(CONFIG_DYNAMIC_FTRACE_WITH_REGS) || \ defined(CONFIG_DYNAMIC_FTRACE_WITH_CALL_OPS) || \ defined(CONFIG_DYNAMIC_FTRACE_WITH_DIRECT_CALLS)/** * ftrace_modify_call - convert from one addr to another (no nop) * @rec: the call site record (e.g. mcount/fentry) * @old_addr: the address expected to be currently called to * @addr: the address to change to * * This is a very sensitive operation and great care needs * to be taken by the arch. The operation should carefully * read the location, check to see if what is read is indeed * what we expect it to be, and then on success of the compare, * it should write to the location. * * When using call ops, this is called when the associated ops change, even * when (addr == old_addr). * * The code segment at @rec->ip should be a caller to @old_addr * * Return must be: * 0 on success * -EFAULT on error reading the location * -EINVAL on a failed compare of the contents * -EPERM on error writing to the location * Any other value will be considered a failure. */extern int ftrace_modify_call(struct dyn_ftrace *rec, unsigned long old_addr, unsigned long addr);#else/* Should never be called */static inline int ftrace_modify_call(struct dyn_ftrace *rec, unsigned long old_addr, unsigned long addr){ return -EINVAL;}#endif
extern int skip_trace(unsigned long ip);extern void ftrace_module_init(struct module *mod);extern void ftrace_module_enable(struct module *mod);extern void ftrace_release_mod(struct module *mod);#else /* CONFIG_DYNAMIC_FTRACE */static inline int skip_trace(unsigned long ip) { return 0; }static inline void ftrace_module_init(struct module *mod) { }static inline void ftrace_module_enable(struct module *mod) { }static inline void ftrace_release_mod(struct module *mod) { }static inline int ftrace_text_reserved(const void *start, const void *end){ return 0;}static inline unsigned long ftrace_location(unsigned long ip){ return 0;}
/* * Again users of functions that have ftrace_ops may not * have them defined when ftrace is not enabled, but these * functions may still be called. Use a macro instead of inline. */#define ftrace_regex_open(tr, ops, flag, inode, file) ({ -ENODEV; })#define ftrace_set_early_filter(ops, buf, enable) do { } while (0)#define ftrace_set_filter_ip(ops, ip, remove, reset) ({ -ENODEV; })#define ftrace_set_filter_ips(ops, ips, cnt, remove, reset) ({ -ENODEV; })#define ftrace_set_filter(ops, buf, len, reset) ({ -ENODEV; })#define ftrace_set_notrace(ops, buf, len, reset) ({ -ENODEV; })#define ftrace_free_filter(ops) do { } while (0)#define ftrace_ops_set_global_filter(ops) do { } while (0)
static inline ssize_t ftrace_filter_write(struct file *file, const char __user *ubuf, size_t cnt, loff_t *ppos) { return -ENODEV; }static inline ssize_t ftrace_notrace_write(struct file *file, const char __user *ubuf, size_t cnt, loff_t *ppos) { return -ENODEV; }static inline intftrace_regex_release(struct inode *inode, struct file *file) { return -ENODEV; }
static inline bool is_ftrace_trampoline(unsigned long addr){ return false;}#endif /* CONFIG_DYNAMIC_FTRACE */
#ifdef CONFIG_FUNCTION_GRAPH_TRACER#ifndef ftrace_graph_func# define ftrace_graph_func ftrace_stub# define FTRACE_OPS_GRAPH_STUB FTRACE_OPS_FL_STUB/* * The function graph is called every time the function tracer is called. * It must always test the ops hash and cannot just directly call * the handler. */# define FGRAPH_NO_DIRECT 1#else# define FTRACE_OPS_GRAPH_STUB 0# define FGRAPH_NO_DIRECT 0#endif#endif /* CONFIG_FUNCTION_GRAPH_TRACER */
/* totally disable ftrace - can not re-enable after this */void ftrace_kill(void);
static inline void tracer_disable(void){#ifdef CONFIG_FUNCTION_TRACER ftrace_enabled = 0;#endif}
/* * Ftrace disable/restore without lock. Some synchronization mechanism * must be used to prevent ftrace_enabled to be changed between * disable/restore. */static inline int __ftrace_enabled_save(void){#ifdef CONFIG_FUNCTION_TRACER int saved_ftrace_enabled = ftrace_enabled; ftrace_enabled = 0; return saved_ftrace_enabled;#else return 0;#endif}
static inline void __ftrace_enabled_restore(int enabled){#ifdef CONFIG_FUNCTION_TRACER ftrace_enabled = enabled;#endif}
/* All archs should have this, but we define it for consistency */#ifndef ftrace_return_address0# define ftrace_return_address0 __builtin_return_address(0)#endif
/* Archs may use other ways for ADDR1 and beyond */#ifndef ftrace_return_address# ifdef CONFIG_FRAME_POINTER# define ftrace_return_address(n) __builtin_return_address(n)# else# define ftrace_return_address(n) 0UL# endif#endif
#define CALLER_ADDR0 ((unsigned long)ftrace_return_address0)#define CALLER_ADDR1 ((unsigned long)ftrace_return_address(1))#define CALLER_ADDR2 ((unsigned long)ftrace_return_address(2))#define CALLER_ADDR3 ((unsigned long)ftrace_return_address(3))#define CALLER_ADDR4 ((unsigned long)ftrace_return_address(4))#define CALLER_ADDR5 ((unsigned long)ftrace_return_address(5))#define CALLER_ADDR6 ((unsigned long)ftrace_return_address(6))
static __always_inline unsigned long get_lock_parent_ip(void){ unsigned long addr = CALLER_ADDR0;
if (!in_lock_functions(addr)) return addr; addr = CALLER_ADDR1; if (!in_lock_functions(addr)) return addr; return CALLER_ADDR2;}
#ifdef CONFIG_TRACE_PREEMPT_TOGGLE extern void trace_preempt_on(unsigned long a0, unsigned long a1); extern void trace_preempt_off(unsigned long a0, unsigned long a1);#else/* * Use defines instead of static inlines because some arches will make code out * of the CALLER_ADDR, when we really want these to be a real nop. */# define trace_preempt_on(a0, a1) do { } while (0)# define trace_preempt_off(a0, a1) do { } while (0)#endif
#ifdef CONFIG_DYNAMIC_FTRACEextern void ftrace_init(void);#ifdef CC_USING_PATCHABLE_FUNCTION_ENTRY#define FTRACE_CALLSITE_SECTION "__patchable_function_entries"#else#define FTRACE_CALLSITE_SECTION "__mcount_loc"#endif#elsestatic inline void ftrace_init(void) { }#endif
/* * Structure that defines an entry function trace. * It's already packed but the attribute "packed" is needed * to remove extra padding at the end. */struct ftrace_graph_ent { unsigned long func; /* Current function */ long depth; /* signed to check for less than zero */} __packed;
/* * Structure that defines an entry function trace with retaddr. */struct fgraph_retaddr_ent { struct ftrace_graph_ent ent; unsigned long retaddr; /* Return address */} __packed;
/* * Structure that defines a return function trace. * It's already packed but the attribute "packed" is needed * to remove extra padding at the end. */struct ftrace_graph_ret { unsigned long func; /* Current function */#ifdef CONFIG_FUNCTION_GRAPH_RETVAL unsigned long retval;#endif int depth; /* Number of functions that overran the depth limit for current task */ unsigned int overrun;} __packed;
struct fgraph_ops;
/* Type of the callback handlers for tracing function graph*/typedef void (*trace_func_graph_ret_t)(struct ftrace_graph_ret *, struct fgraph_ops *, struct ftrace_regs *); /* return */typedef int (*trace_func_graph_ent_t)(struct ftrace_graph_ent *, struct fgraph_ops *, struct ftrace_regs *); /* entry */
extern int ftrace_graph_entry_stub(struct ftrace_graph_ent *trace, struct fgraph_ops *gops, struct ftrace_regs *fregs);bool ftrace_pids_enabled(struct ftrace_ops *ops);
#ifdef CONFIG_FUNCTION_GRAPH_TRACER
struct fgraph_ops { trace_func_graph_ent_t entryfunc; trace_func_graph_ret_t retfunc; struct ftrace_ops ops; /* for the hash lists */ void *private; trace_func_graph_ent_t saved_func; int idx;};
void *fgraph_reserve_data(int idx, int size_bytes);void *fgraph_retrieve_data(int idx, int *size_bytes);void *fgraph_retrieve_parent_data(int idx, int *size_bytes, int depth);
/* * Stack of return addresses for functions * of a thread. * Used in struct thread_info */struct ftrace_ret_stack { unsigned long ret; unsigned long func;#ifdef HAVE_FUNCTION_GRAPH_FP_TEST unsigned long fp;#endif unsigned long *retp;};
/* * Primary handler of a function return. * It relays on ftrace_return_to_handler. * Defined in entry_32/64.S */extern void return_to_handler(void);
extern intfunction_graph_enter_regs(unsigned long ret, unsigned long func, unsigned long frame_pointer, unsigned long *retp, struct ftrace_regs *fregs);
static inline int function_graph_enter(unsigned long ret, unsigned long func, unsigned long fp, unsigned long *retp){ return function_graph_enter_regs(ret, func, fp, retp, NULL);}
struct ftrace_ret_stack *ftrace_graph_get_ret_stack(struct task_struct *task, int skip);unsigned long ftrace_graph_top_ret_addr(struct task_struct *task);
unsigned long ftrace_graph_ret_addr(struct task_struct *task, int *idx, unsigned long ret, unsigned long *retp);unsigned long *fgraph_get_task_var(struct fgraph_ops *gops);
/* * Sometimes we don't want to trace a function with the function * graph tracer but we want them to keep traced by the usual function * tracer if the function graph tracer is not configured. */#define __notrace_funcgraph notrace
#define FTRACE_RETFUNC_DEPTH 50#define FTRACE_RETSTACK_ALLOC_SIZE 32
extern int register_ftrace_graph(struct fgraph_ops *ops);extern void unregister_ftrace_graph(struct fgraph_ops *ops);
/** * ftrace_graph_is_dead - returns true if ftrace_graph_stop() was called * * ftrace_graph_stop() is called when a severe error is detected in * the function graph tracing. This function is called by the critical * paths of function graph to keep those paths from doing any more harm. */DECLARE_STATIC_KEY_FALSE(kill_ftrace_graph);
static inline bool ftrace_graph_is_dead(void){ return static_branch_unlikely(&kill_ftrace_graph);}
extern void ftrace_graph_stop(void);
/* The current handlers in use */extern trace_func_graph_ret_t ftrace_graph_return;extern trace_func_graph_ent_t ftrace_graph_entry;
extern void ftrace_graph_init_task(struct task_struct *t);extern void ftrace_graph_exit_task(struct task_struct *t);extern void ftrace_graph_init_idle_task(struct task_struct *t, int cpu);
/* Used by assembly, but to quiet sparse warnings */extern struct ftrace_ops *function_trace_op;
static inline void pause_graph_tracing(void){ atomic_inc(¤t->tracing_graph_pause);}
static inline void unpause_graph_tracing(void){ atomic_dec(¤t->tracing_graph_pause);}#else /* !CONFIG_FUNCTION_GRAPH_TRACER */
#define __notrace_funcgraph
static inline void ftrace_graph_init_task(struct task_struct *t) { }static inline void ftrace_graph_exit_task(struct task_struct *t) { }static inline void ftrace_graph_init_idle_task(struct task_struct *t, int cpu) { }
/* Define as macros as fgraph_ops may not be defined */#define register_ftrace_graph(ops) ({ -1; })#define unregister_ftrace_graph(ops) do { } while (0)
static inline unsigned longftrace_graph_ret_addr(struct task_struct *task, int *idx, unsigned long ret, unsigned long *retp){ return ret;}
static inline void pause_graph_tracing(void) { }static inline void unpause_graph_tracing(void) { }#endif /* CONFIG_FUNCTION_GRAPH_TRACER */
#ifdef CONFIG_TRACINGenum ftrace_dump_mode;
extern int ftrace_dump_on_oops_enabled(void);
extern void disable_trace_on_warning(void);
#else /* CONFIG_TRACING */static inline void disable_trace_on_warning(void) { }#endif /* CONFIG_TRACING */
#ifdef CONFIG_FTRACE_SYSCALLS
unsigned long arch_syscall_addr(int nr);
#endif /* CONFIG_FTRACE_SYSCALLS */
#endif /* _LINUX_FTRACE_H */