1147 lines
38 KiB
C
1147 lines
38 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Ftrace header. For implementation details beyond the random comments
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* scattered below, see: Documentation/trace/ftrace-design.rst
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*/
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#ifndef _LINUX_FTRACE_H
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#define _LINUX_FTRACE_H
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#include <linux/trace_recursion.h>
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#include <linux/trace_clock.h>
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#include <linux/jump_label.h>
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#include <linux/kallsyms.h>
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#include <linux/linkage.h>
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#include <linux/bitops.h>
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#include <linux/ptrace.h>
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#include <linux/ktime.h>
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#include <linux/sched.h>
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#include <linux/types.h>
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#include <linux/init.h>
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#include <linux/fs.h>
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#include <asm/ftrace.h>
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/*
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* If the arch supports passing the variable contents of
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* function_trace_op as the third parameter back from the
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* mcount call, then the arch should define this as 1.
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*/
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#ifndef ARCH_SUPPORTS_FTRACE_OPS
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#define ARCH_SUPPORTS_FTRACE_OPS 0
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#endif
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#ifdef CONFIG_TRACING
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extern void ftrace_boot_snapshot(void);
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#else
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static inline void ftrace_boot_snapshot(void) { }
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#endif
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#ifdef CONFIG_FUNCTION_TRACER
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struct ftrace_ops;
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struct ftrace_regs;
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/*
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* If the arch's mcount caller does not support all of ftrace's
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* features, then it must call an indirect function that
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* does. Or at least does enough to prevent any unwelcome side effects.
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*
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* Also define the function prototype that these architectures use
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* to call the ftrace_ops_list_func().
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*/
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#if !ARCH_SUPPORTS_FTRACE_OPS
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# define FTRACE_FORCE_LIST_FUNC 1
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void arch_ftrace_ops_list_func(unsigned long ip, unsigned long parent_ip);
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#else
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# define FTRACE_FORCE_LIST_FUNC 0
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void arch_ftrace_ops_list_func(unsigned long ip, unsigned long parent_ip,
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struct ftrace_ops *op, struct ftrace_regs *fregs);
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#endif
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#endif /* CONFIG_FUNCTION_TRACER */
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/* Main tracing buffer and events set up */
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#ifdef CONFIG_TRACING
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void trace_init(void);
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void early_trace_init(void);
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#else
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static inline void trace_init(void) { }
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static inline void early_trace_init(void) { }
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#endif
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struct module;
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struct ftrace_hash;
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struct ftrace_direct_func;
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#if defined(CONFIG_FUNCTION_TRACER) && defined(CONFIG_MODULES) && \
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defined(CONFIG_DYNAMIC_FTRACE)
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const char *
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ftrace_mod_address_lookup(unsigned long addr, unsigned long *size,
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unsigned long *off, char **modname, char *sym);
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#else
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static inline const char *
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ftrace_mod_address_lookup(unsigned long addr, unsigned long *size,
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unsigned long *off, char **modname, char *sym)
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{
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return NULL;
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}
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#endif
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#if defined(CONFIG_FUNCTION_TRACER) && defined(CONFIG_DYNAMIC_FTRACE)
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int ftrace_mod_get_kallsym(unsigned int symnum, unsigned long *value,
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char *type, char *name,
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char *module_name, int *exported);
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#else
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static inline int ftrace_mod_get_kallsym(unsigned int symnum, unsigned long *value,
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char *type, char *name,
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char *module_name, int *exported)
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{
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return -1;
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}
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#endif
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#ifdef CONFIG_FUNCTION_TRACER
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extern int ftrace_enabled;
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#ifndef CONFIG_HAVE_DYNAMIC_FTRACE_WITH_ARGS
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struct ftrace_regs {
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struct pt_regs regs;
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};
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#define arch_ftrace_get_regs(fregs) (&(fregs)->regs)
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/*
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* ftrace_instruction_pointer_set() is to be defined by the architecture
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* if to allow setting of the instruction pointer from the ftrace_regs
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* when HAVE_DYNAMIC_FTRACE_WITH_ARGS is set and it supports
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* live kernel patching.
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*/
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#define ftrace_instruction_pointer_set(fregs, ip) do { } while (0)
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#endif /* CONFIG_HAVE_DYNAMIC_FTRACE_WITH_ARGS */
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static __always_inline struct pt_regs *ftrace_get_regs(struct ftrace_regs *fregs)
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{
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if (!fregs)
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return NULL;
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return arch_ftrace_get_regs(fregs);
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}
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typedef void (*ftrace_func_t)(unsigned long ip, unsigned long parent_ip,
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struct ftrace_ops *op, struct ftrace_regs *fregs);
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ftrace_func_t ftrace_ops_get_func(struct ftrace_ops *ops);
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/*
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* FTRACE_OPS_FL_* bits denote the state of ftrace_ops struct and are
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* set in the flags member.
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* CONTROL, SAVE_REGS, SAVE_REGS_IF_SUPPORTED, RECURSION, STUB and
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* IPMODIFY are a kind of attribute flags which can be set only before
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* registering the ftrace_ops, and can not be modified while registered.
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* Changing those attribute flags after registering ftrace_ops will
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* cause unexpected results.
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*
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* ENABLED - set/unset when ftrace_ops is registered/unregistered
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* DYNAMIC - set when ftrace_ops is registered to denote dynamically
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* allocated ftrace_ops which need special care
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* SAVE_REGS - The ftrace_ops wants regs saved at each function called
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* and passed to the callback. If this flag is set, but the
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* architecture does not support passing regs
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* (CONFIG_DYNAMIC_FTRACE_WITH_REGS is not defined), then the
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* ftrace_ops will fail to register, unless the next flag
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* is set.
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* SAVE_REGS_IF_SUPPORTED - This is the same as SAVE_REGS, but if the
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* handler can handle an arch that does not save regs
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* (the handler tests if regs == NULL), then it can set
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* this flag instead. It will not fail registering the ftrace_ops
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* but, the regs field will be NULL if the arch does not support
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* passing regs to the handler.
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* Note, if this flag is set, the SAVE_REGS flag will automatically
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* get set upon registering the ftrace_ops, if the arch supports it.
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* RECURSION - The ftrace_ops can set this to tell the ftrace infrastructure
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* that the call back needs recursion protection. If it does
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* not set this, then the ftrace infrastructure will assume
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* that the callback can handle recursion on its own.
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* STUB - The ftrace_ops is just a place holder.
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* INITIALIZED - The ftrace_ops has already been initialized (first use time
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* register_ftrace_function() is called, it will initialized the ops)
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* DELETED - The ops are being deleted, do not let them be registered again.
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* ADDING - The ops is in the process of being added.
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* REMOVING - The ops is in the process of being removed.
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* MODIFYING - The ops is in the process of changing its filter functions.
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* ALLOC_TRAMP - A dynamic trampoline was allocated by the core code.
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* The arch specific code sets this flag when it allocated a
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* trampoline. This lets the arch know that it can update the
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* trampoline in case the callback function changes.
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* The ftrace_ops trampoline can be set by the ftrace users, and
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* in such cases the arch must not modify it. Only the arch ftrace
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* core code should set this flag.
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* IPMODIFY - The ops can modify the IP register. This can only be set with
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* SAVE_REGS. If another ops with this flag set is already registered
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* for any of the functions that this ops will be registered for, then
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* this ops will fail to register or set_filter_ip.
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* PID - Is affected by set_ftrace_pid (allows filtering on those pids)
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* RCU - Set when the ops can only be called when RCU is watching.
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* TRACE_ARRAY - The ops->private points to a trace_array descriptor.
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* PERMANENT - Set when the ops is permanent and should not be affected by
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* ftrace_enabled.
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* DIRECT - Used by the direct ftrace_ops helper for direct functions
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* (internal ftrace only, should not be used by others)
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*/
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enum {
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FTRACE_OPS_FL_ENABLED = BIT(0),
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FTRACE_OPS_FL_DYNAMIC = BIT(1),
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FTRACE_OPS_FL_SAVE_REGS = BIT(2),
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FTRACE_OPS_FL_SAVE_REGS_IF_SUPPORTED = BIT(3),
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FTRACE_OPS_FL_RECURSION = BIT(4),
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FTRACE_OPS_FL_STUB = BIT(5),
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FTRACE_OPS_FL_INITIALIZED = BIT(6),
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FTRACE_OPS_FL_DELETED = BIT(7),
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FTRACE_OPS_FL_ADDING = BIT(8),
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FTRACE_OPS_FL_REMOVING = BIT(9),
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FTRACE_OPS_FL_MODIFYING = BIT(10),
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FTRACE_OPS_FL_ALLOC_TRAMP = BIT(11),
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FTRACE_OPS_FL_IPMODIFY = BIT(12),
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FTRACE_OPS_FL_PID = BIT(13),
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FTRACE_OPS_FL_RCU = BIT(14),
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FTRACE_OPS_FL_TRACE_ARRAY = BIT(15),
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FTRACE_OPS_FL_PERMANENT = BIT(16),
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FTRACE_OPS_FL_DIRECT = BIT(17),
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};
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/*
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* FTRACE_OPS_CMD_* commands allow the ftrace core logic to request changes
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* to a ftrace_ops. Note, the requests may fail.
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*
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* ENABLE_SHARE_IPMODIFY_SELF - enable a DIRECT ops to work on the same
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* function as an ops with IPMODIFY. Called
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* when the DIRECT ops is being registered.
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* This is called with both direct_mutex and
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* ftrace_lock are locked.
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*
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* ENABLE_SHARE_IPMODIFY_PEER - enable a DIRECT ops to work on the same
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* function as an ops with IPMODIFY. Called
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* when the other ops (the one with IPMODIFY)
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* is being registered.
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* This is called with direct_mutex locked.
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*
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* DISABLE_SHARE_IPMODIFY_PEER - disable a DIRECT ops to work on the same
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* function as an ops with IPMODIFY. Called
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* when the other ops (the one with IPMODIFY)
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* is being unregistered.
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* This is called with direct_mutex locked.
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*/
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enum ftrace_ops_cmd {
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FTRACE_OPS_CMD_ENABLE_SHARE_IPMODIFY_SELF,
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FTRACE_OPS_CMD_ENABLE_SHARE_IPMODIFY_PEER,
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FTRACE_OPS_CMD_DISABLE_SHARE_IPMODIFY_PEER,
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};
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/*
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* For most ftrace_ops_cmd,
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* Returns:
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* 0 - Success.
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* Negative on failure. The return value is dependent on the
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* callback.
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*/
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typedef int (*ftrace_ops_func_t)(struct ftrace_ops *op, enum ftrace_ops_cmd cmd);
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#ifdef CONFIG_DYNAMIC_FTRACE
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/* The hash used to know what functions callbacks trace */
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struct ftrace_ops_hash {
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struct ftrace_hash __rcu *notrace_hash;
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struct ftrace_hash __rcu *filter_hash;
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struct mutex regex_lock;
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};
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void ftrace_free_init_mem(void);
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void ftrace_free_mem(struct module *mod, void *start, void *end);
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#else
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static inline void ftrace_free_init_mem(void)
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{
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ftrace_boot_snapshot();
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}
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static inline void ftrace_free_mem(struct module *mod, void *start, void *end) { }
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#endif
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/*
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* Note, ftrace_ops can be referenced outside of RCU protection, unless
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* the RCU flag is set. If ftrace_ops is allocated and not part of kernel
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* core data, the unregistering of it will perform a scheduling on all CPUs
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* to make sure that there are no more users. Depending on the load of the
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* system that may take a bit of time.
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*
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* Any private data added must also take care not to be freed and if private
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* data is added to a ftrace_ops that is in core code, the user of the
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* ftrace_ops must perform a schedule_on_each_cpu() before freeing it.
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*/
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struct ftrace_ops {
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ftrace_func_t func;
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struct ftrace_ops __rcu *next;
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unsigned long flags;
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void *private;
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ftrace_func_t saved_func;
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#ifdef CONFIG_DYNAMIC_FTRACE
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struct ftrace_ops_hash local_hash;
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struct ftrace_ops_hash *func_hash;
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struct ftrace_ops_hash old_hash;
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unsigned long trampoline;
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unsigned long trampoline_size;
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struct list_head list;
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ftrace_ops_func_t ops_func;
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#endif
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};
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extern struct ftrace_ops __rcu *ftrace_ops_list;
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extern struct ftrace_ops ftrace_list_end;
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/*
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* Traverse the ftrace_ops_list, invoking all entries. The reason that we
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* can use rcu_dereference_raw_check() is that elements removed from this list
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* are simply leaked, so there is no need to interact with a grace-period
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* mechanism. The rcu_dereference_raw_check() calls are needed to handle
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* concurrent insertions into the ftrace_ops_list.
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*
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* Silly Alpha and silly pointer-speculation compiler optimizations!
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*/
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#define do_for_each_ftrace_op(op, list) \
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op = rcu_dereference_raw_check(list); \
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do
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/*
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* Optimized for just a single item in the list (as that is the normal case).
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*/
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#define while_for_each_ftrace_op(op) \
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while (likely(op = rcu_dereference_raw_check((op)->next)) && \
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unlikely((op) != &ftrace_list_end))
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/*
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* Type of the current tracing.
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*/
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enum ftrace_tracing_type_t {
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FTRACE_TYPE_ENTER = 0, /* Hook the call of the function */
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FTRACE_TYPE_RETURN, /* Hook the return of the function */
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};
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/* Current tracing type, default is FTRACE_TYPE_ENTER */
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extern enum ftrace_tracing_type_t ftrace_tracing_type;
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/*
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* The ftrace_ops must be a static and should also
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* be read_mostly. These functions do modify read_mostly variables
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* so use them sparely. Never free an ftrace_op or modify the
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* next pointer after it has been registered. Even after unregistering
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* it, the next pointer may still be used internally.
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*/
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int register_ftrace_function(struct ftrace_ops *ops);
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int unregister_ftrace_function(struct ftrace_ops *ops);
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extern void ftrace_stub(unsigned long a0, unsigned long a1,
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struct ftrace_ops *op, struct ftrace_regs *fregs);
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int ftrace_lookup_symbols(const char **sorted_syms, size_t cnt, unsigned long *addrs);
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#else /* !CONFIG_FUNCTION_TRACER */
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/*
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* (un)register_ftrace_function must be a macro since the ops parameter
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* must not be evaluated.
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*/
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#define register_ftrace_function(ops) ({ 0; })
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#define unregister_ftrace_function(ops) ({ 0; })
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static inline void ftrace_kill(void) { }
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static inline void ftrace_free_init_mem(void) { }
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static inline void ftrace_free_mem(struct module *mod, void *start, void *end) { }
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static inline int ftrace_lookup_symbols(const char **sorted_syms, size_t cnt, unsigned long *addrs)
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{
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return -EOPNOTSUPP;
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}
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#endif /* CONFIG_FUNCTION_TRACER */
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struct ftrace_func_entry {
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struct hlist_node hlist;
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unsigned long ip;
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unsigned long direct; /* for direct lookup only */
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};
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struct dyn_ftrace;
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#ifdef CONFIG_DYNAMIC_FTRACE_WITH_DIRECT_CALLS
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extern int ftrace_direct_func_count;
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int register_ftrace_direct(unsigned long ip, unsigned long addr);
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int unregister_ftrace_direct(unsigned long ip, unsigned long addr);
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int modify_ftrace_direct(unsigned long ip, unsigned long old_addr, unsigned long new_addr);
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struct ftrace_direct_func *ftrace_find_direct_func(unsigned long addr);
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int ftrace_modify_direct_caller(struct ftrace_func_entry *entry,
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struct dyn_ftrace *rec,
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unsigned long old_addr,
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unsigned long new_addr);
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unsigned long ftrace_find_rec_direct(unsigned long ip);
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int register_ftrace_direct_multi(struct ftrace_ops *ops, unsigned long addr);
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int unregister_ftrace_direct_multi(struct ftrace_ops *ops, unsigned long addr);
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int modify_ftrace_direct_multi(struct ftrace_ops *ops, unsigned long addr);
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int modify_ftrace_direct_multi_nolock(struct ftrace_ops *ops, unsigned long addr);
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#else
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struct ftrace_ops;
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# define ftrace_direct_func_count 0
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static inline int register_ftrace_direct(unsigned long ip, unsigned long addr)
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{
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return -ENOTSUPP;
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}
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static inline int unregister_ftrace_direct(unsigned long ip, unsigned long addr)
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{
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return -ENOTSUPP;
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}
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static inline int modify_ftrace_direct(unsigned long ip,
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unsigned long old_addr, unsigned long new_addr)
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{
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return -ENOTSUPP;
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}
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static inline struct ftrace_direct_func *ftrace_find_direct_func(unsigned long addr)
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{
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return NULL;
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}
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static inline int ftrace_modify_direct_caller(struct ftrace_func_entry *entry,
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struct dyn_ftrace *rec,
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unsigned long old_addr,
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unsigned long new_addr)
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{
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return -ENODEV;
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}
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static inline unsigned long ftrace_find_rec_direct(unsigned long ip)
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{
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return 0;
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}
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static inline int register_ftrace_direct_multi(struct ftrace_ops *ops, unsigned long addr)
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{
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return -ENODEV;
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}
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static inline int unregister_ftrace_direct_multi(struct ftrace_ops *ops, unsigned long addr)
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{
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return -ENODEV;
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}
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static inline int modify_ftrace_direct_multi(struct ftrace_ops *ops, unsigned long addr)
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{
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return -ENODEV;
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}
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static inline int modify_ftrace_direct_multi_nolock(struct ftrace_ops *ops, unsigned long addr)
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{
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return -ENODEV;
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}
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#endif /* CONFIG_DYNAMIC_FTRACE_WITH_DIRECT_CALLS */
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#ifndef CONFIG_HAVE_DYNAMIC_FTRACE_WITH_DIRECT_CALLS
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/*
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* This must be implemented by the architecture.
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* It is the way the ftrace direct_ops helper, when called
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* via ftrace (because there's other callbacks besides the
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* direct call), can inform the architecture's trampoline that this
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* routine has a direct caller, and what the caller is.
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*
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* For example, in x86, it returns the direct caller
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* callback function via the regs->orig_ax parameter.
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* Then in the ftrace trampoline, if this is set, it makes
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* the return from the trampoline jump to the direct caller
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* instead of going back to the function it just traced.
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*/
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static inline void arch_ftrace_set_direct_caller(struct pt_regs *regs,
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unsigned long addr) { }
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#endif /* CONFIG_HAVE_DYNAMIC_FTRACE_WITH_DIRECT_CALLS */
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#ifdef CONFIG_STACK_TRACER
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extern int stack_tracer_enabled;
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int stack_trace_sysctl(struct ctl_table *table, int write, void *buffer,
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size_t *lenp, loff_t *ppos);
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/* DO NOT MODIFY THIS VARIABLE DIRECTLY! */
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DECLARE_PER_CPU(int, disable_stack_tracer);
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/**
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|
* 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);
|
|
}
|
|
#else
|
|
static inline void stack_tracer_disable(void) { }
|
|
static inline void stack_tracer_enable(void) { }
|
|
#endif
|
|
|
|
#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
|
|
*
|
|
* 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_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);
|
|
|
|
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_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_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 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_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 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 */
|
|
|
|
#ifdef CONFIG_FUNCTION_GRAPH_TRACER
|
|
#ifndef ftrace_graph_func
|
|
#define ftrace_graph_func ftrace_stub
|
|
#define FTRACE_OPS_GRAPH_STUB FTRACE_OPS_FL_STUB
|
|
#else
|
|
#define FTRACE_OPS_GRAPH_STUB 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_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 */
|
|
int depth;
|
|
/* Number of functions that overran the depth limit for current task */
|
|
unsigned int overrun;
|
|
unsigned long long calltime;
|
|
unsigned long long rettime;
|
|
} __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);
|
|
|
|
/**
|
|
* 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);
|
|
|
|
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
|
|
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 */
|