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- /* SPDX-License-Identifier: GPL-2.0 */
- /*
- * Ftrace header. For implementation details beyond the random comments
- * scattered below, see: Documentation/trace/ftrace-design.rst
- */
- #ifndef _LINUX_FTRACE_H
- #define _LINUX_FTRACE_H
- #include <linux/trace_clock.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
- /*
- * 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 unwelcomed side effects.
- */
- #if !ARCH_SUPPORTS_FTRACE_OPS
- # define FTRACE_FORCE_LIST_FUNC 1
- #else
- # define FTRACE_FORCE_LIST_FUNC 0
- #endif
- /* Main tracing buffer and events set up */
- #ifdef CONFIG_TRACING
- void trace_init(void);
- void early_trace_init(void);
- #else
- static inline void trace_init(void) { }
- static inline void early_trace_init(void) { }
- #endif
- struct module;
- struct ftrace_hash;
- struct ftrace_direct_func;
- #if defined(CONFIG_FUNCTION_TRACER) && defined(CONFIG_MODULES) && \
- defined(CONFIG_DYNAMIC_FTRACE)
- const char *
- ftrace_mod_address_lookup(unsigned long addr, unsigned long *size,
- unsigned long *off, char **modname, char *sym);
- #else
- static inline const char *
- ftrace_mod_address_lookup(unsigned long addr, unsigned long *size,
- unsigned long *off, char **modname, char *sym)
- {
- return NULL;
- }
- #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);
- #else
- static 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
- extern int ftrace_enabled;
- extern int
- ftrace_enable_sysctl(struct ctl_table *table, int write,
- void *buffer, size_t *lenp, loff_t *ppos);
- struct ftrace_ops;
- typedef void (*ftrace_func_t)(unsigned long ip, unsigned long parent_ip,
- struct ftrace_ops *op, struct pt_regs *regs);
- 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_SAFE, 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_SAFE - The ftrace_ops can set this to tell the ftrace infrastructure
- * that the call back has its own recursion protection. If it does
- * not set this, then the ftrace infrastructure will add recursion
- * protection for the caller.
- * 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)
- */
- 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_SAFE = 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),
- };
- #ifdef CONFIG_DYNAMIC_FTRACE
- /* 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);
- #else
- static inline void ftrace_free_init_mem(void) { }
- 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;
- #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 pt_regs *regs);
- #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) { }
- #endif /* CONFIG_FUNCTION_TRACER */
- struct ftrace_func_entry {
- struct hlist_node hlist;
- unsigned long ip;
- unsigned long direct; /* for direct lookup only */
- };
- struct dyn_ftrace;
- #ifdef CONFIG_DYNAMIC_FTRACE_WITH_DIRECT_CALLS
- extern int ftrace_direct_func_count;
- int register_ftrace_direct(unsigned long ip, unsigned long addr);
- int unregister_ftrace_direct(unsigned long ip, unsigned long addr);
- int modify_ftrace_direct(unsigned long ip, unsigned long old_addr, unsigned long new_addr);
- struct ftrace_direct_func *ftrace_find_direct_func(unsigned long addr);
- int ftrace_modify_direct_caller(struct ftrace_func_entry *entry,
- struct dyn_ftrace *rec,
- unsigned long old_addr,
- unsigned long new_addr);
- unsigned long ftrace_find_rec_direct(unsigned long ip);
- #else
- # define ftrace_direct_func_count 0
- static inline int register_ftrace_direct(unsigned long ip, unsigned long addr)
- {
- return -ENOTSUPP;
- }
- static inline int unregister_ftrace_direct(unsigned long ip, unsigned long addr)
- {
- return -ENOTSUPP;
- }
- static inline int modify_ftrace_direct(unsigned long ip,
- unsigned long old_addr, unsigned long new_addr)
- {
- return -ENOTSUPP;
- }
- static inline struct ftrace_direct_func *ftrace_find_direct_func(unsigned long addr)
- {
- return NULL;
- }
- static inline int ftrace_modify_direct_caller(struct ftrace_func_entry *entry,
- struct dyn_ftrace *rec,
- unsigned long old_addr,
- unsigned long new_addr)
- {
- return -ENODEV;
- }
- static inline unsigned long ftrace_find_rec_direct(unsigned long ip)
- {
- return 0;
- }
- #endif /* CONFIG_DYNAMIC_FTRACE_WITH_DIRECT_CALLS */
- #ifndef CONFIG_HAVE_DYNAMIC_FTRACE_WITH_DIRECT_CALLS
- /*
- * 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 pt_regs *regs,
- unsigned long addr) { }
- #endif /* CONFIG_HAVE_DYNAMIC_FTRACE_WITH_DIRECT_CALLS */
- #ifdef CONFIG_STACK_TRACER
- extern int stack_tracer_enabled;
- int stack_trace_sysctl(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 interupts 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);
- }
- #else
- static inline void stack_tracer_disable(void) { }
- static inline void stack_tracer_enable(void) { }
- #endif
- #ifdef CONFIG_DYNAMIC_FTRACE
- int ftrace_arch_code_modify_prepare(void);
- int 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
- *
- * 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),
- };
- #define FTRACE_REF_MAX_SHIFT 23
- #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_force_update(void);
- int ftrace_set_filter_ip(struct ftrace_ops *ops, unsigned long ip,
- 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);
- 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),
- };
- /*
- * 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),
- };
- 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;
- int ftrace_regex_open(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 __init
- ftrace_set_early_filter(struct ftrace_ops *ops, char *buf, int enable);
- /* defined in arch */
- extern int ftrace_ip_converted(unsigned long ip);
- 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_TRACER
- extern void ftrace_graph_caller(void);
- extern int ftrace_enable_ftrace_graph_caller(void);
- extern int ftrace_disable_ftrace_graph_caller(void);
- #else
- static 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_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_nop
- static 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);
- #ifdef CONFIG_DYNAMIC_FTRACE_WITH_REGS
- /**
- * 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.
- *
- * 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
- /* May be defined in arch */
- extern int ftrace_arch_read_dyn_info(char *buf, int size);
- 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);
- extern void ftrace_disable_daemon(void);
- extern void ftrace_enable_daemon(void);
- #else /* CONFIG_DYNAMIC_FTRACE */
- static inline int skip_trace(unsigned long ip) { return 0; }
- static inline int ftrace_force_update(void) { return 0; }
- static inline void ftrace_disable_daemon(void) { }
- static inline void ftrace_enable_daemon(void) { }
- 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(ops, flag, inod, 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(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 int
- ftrace_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 */
- /* 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 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_FTRACE_MCOUNT_RECORD
- extern 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
- #else
- static 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 */
- int depth;
- } __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 */
- /* Number of functions that overran the depth limit for current task */
- unsigned long overrun;
- unsigned long long calltime;
- unsigned long long rettime;
- int depth;
- } __packed;
- /* Type of the callback handlers for tracing function graph*/
- typedef void (*trace_func_graph_ret_t)(struct ftrace_graph_ret *); /* return */
- typedef int (*trace_func_graph_ent_t)(struct ftrace_graph_ent *); /* entry */
- extern int ftrace_graph_entry_stub(struct ftrace_graph_ent *trace);
- #ifdef CONFIG_FUNCTION_GRAPH_TRACER
- struct fgraph_ops {
- trace_func_graph_ent_t entryfunc;
- trace_func_graph_ret_t retfunc;
- };
- /*
- * Stack of return addresses for functions
- * of a thread.
- * Used in struct thread_info
- */
- struct ftrace_ret_stack {
- unsigned long ret;
- unsigned long func;
- unsigned long long calltime;
- #ifdef CONFIG_FUNCTION_PROFILER
- unsigned long long subtime;
- #endif
- #ifdef HAVE_FUNCTION_GRAPH_FP_TEST
- unsigned long fp;
- #endif
- #ifdef HAVE_FUNCTION_GRAPH_RET_ADDR_PTR
- unsigned long *retp;
- #endif
- };
- /*
- * 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 int
- function_graph_enter(unsigned long ret, unsigned long func,
- unsigned long frame_pointer, unsigned long *retp);
- struct ftrace_ret_stack *
- ftrace_graph_get_ret_stack(struct task_struct *task, int idx);
- unsigned long ftrace_graph_ret_addr(struct task_struct *task, int *idx,
- unsigned long ret, unsigned long *retp);
- /*
- * 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);
- extern bool ftrace_graph_is_dead(void);
- 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);
- 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 long
- ftrace_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_TRACING
- /* flags for current->trace */
- enum {
- TSK_TRACE_FL_TRACE_BIT = 0,
- TSK_TRACE_FL_GRAPH_BIT = 1,
- };
- enum {
- TSK_TRACE_FL_TRACE = 1 << TSK_TRACE_FL_TRACE_BIT,
- TSK_TRACE_FL_GRAPH = 1 << TSK_TRACE_FL_GRAPH_BIT,
- };
- static inline void set_tsk_trace_trace(struct task_struct *tsk)
- {
- set_bit(TSK_TRACE_FL_TRACE_BIT, &tsk->trace);
- }
- static inline void clear_tsk_trace_trace(struct task_struct *tsk)
- {
- clear_bit(TSK_TRACE_FL_TRACE_BIT, &tsk->trace);
- }
- static inline int test_tsk_trace_trace(struct task_struct *tsk)
- {
- return tsk->trace & TSK_TRACE_FL_TRACE;
- }
- static inline void set_tsk_trace_graph(struct task_struct *tsk)
- {
- set_bit(TSK_TRACE_FL_GRAPH_BIT, &tsk->trace);
- }
- static inline void clear_tsk_trace_graph(struct task_struct *tsk)
- {
- clear_bit(TSK_TRACE_FL_GRAPH_BIT, &tsk->trace);
- }
- static inline int test_tsk_trace_graph(struct task_struct *tsk)
- {
- return tsk->trace & TSK_TRACE_FL_GRAPH;
- }
- enum ftrace_dump_mode;
- extern enum ftrace_dump_mode ftrace_dump_on_oops;
- extern int tracepoint_printk;
- extern void disable_trace_on_warning(void);
- extern int __disable_trace_on_warning;
- int tracepoint_printk_sysctl(struct ctl_table *table, int write,
- void *buffer, size_t *lenp, loff_t *ppos);
- #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 */
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