258 lines
7.6 KiB
C
258 lines
7.6 KiB
C
#ifndef _LINUX_FTRACE_H
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#define _LINUX_FTRACE_H
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#include <linux/linkage.h>
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#include <linux/fs.h>
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#include <linux/ktime.h>
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#include <linux/init.h>
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#include <linux/types.h>
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#include <linux/kallsyms.h>
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#ifdef CONFIG_FUNCTION_TRACER
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extern int ftrace_enabled;
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extern int
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ftrace_enable_sysctl(struct ctl_table *table, int write,
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struct file *filp, void __user *buffer, size_t *lenp,
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loff_t *ppos);
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typedef void (*ftrace_func_t)(unsigned long ip, unsigned long parent_ip);
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struct ftrace_ops {
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ftrace_func_t func;
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struct ftrace_ops *next;
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};
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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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void clear_ftrace_function(void);
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extern void ftrace_stub(unsigned long a0, unsigned long a1);
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#else /* !CONFIG_FUNCTION_TRACER */
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# define register_ftrace_function(ops) do { } while (0)
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# define unregister_ftrace_function(ops) do { } while (0)
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# define clear_ftrace_function(ops) do { } while (0)
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static inline void ftrace_kill(void) { }
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#endif /* CONFIG_FUNCTION_TRACER */
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#ifdef CONFIG_DYNAMIC_FTRACE
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enum {
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FTRACE_FL_FREE = (1 << 0),
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FTRACE_FL_FAILED = (1 << 1),
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FTRACE_FL_FILTER = (1 << 2),
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FTRACE_FL_ENABLED = (1 << 3),
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FTRACE_FL_NOTRACE = (1 << 4),
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FTRACE_FL_CONVERTED = (1 << 5),
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FTRACE_FL_FROZEN = (1 << 6),
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};
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struct dyn_ftrace {
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struct list_head list;
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unsigned long ip; /* address of mcount call-site */
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unsigned long flags;
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};
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int ftrace_force_update(void);
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void ftrace_set_filter(unsigned char *buf, int len, int reset);
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/* defined in arch */
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extern int ftrace_ip_converted(unsigned long ip);
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extern unsigned char *ftrace_nop_replace(void);
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extern unsigned char *ftrace_call_replace(unsigned long ip, unsigned long addr);
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extern int ftrace_dyn_arch_init(void *data);
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extern int ftrace_update_ftrace_func(ftrace_func_t func);
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extern void ftrace_caller(void);
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extern void ftrace_call(void);
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extern void mcount_call(void);
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/* May be defined in arch */
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extern int ftrace_arch_read_dyn_info(char *buf, int size);
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/**
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* ftrace_modify_code - modify code segment
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* @ip: the address of the code segment
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* @old_code: the contents of what is expected to be there
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* @new_code: the code to patch in
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*
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* This is a very sensitive operation and great care needs
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* to be taken by the arch. The operation should carefully
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* read the location, check to see if what is read is indeed
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* what we expect it to be, and then on success of the compare,
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* it should write to the location.
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*
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* Return must be:
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* 0 on success
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* -EFAULT on error reading the location
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* -EINVAL on a failed compare of the contents
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* -EPERM on error writing to the location
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* Any other value will be considered a failure.
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*/
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extern int ftrace_modify_code(unsigned long ip, unsigned char *old_code,
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unsigned char *new_code);
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extern int skip_trace(unsigned long ip);
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extern void ftrace_release(void *start, unsigned long size);
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extern void ftrace_disable_daemon(void);
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extern void ftrace_enable_daemon(void);
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#else
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# define skip_trace(ip) ({ 0; })
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# define ftrace_force_update() ({ 0; })
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# define ftrace_set_filter(buf, len, reset) do { } while (0)
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# define ftrace_disable_daemon() do { } while (0)
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# define ftrace_enable_daemon() do { } while (0)
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static inline void ftrace_release(void *start, unsigned long size) { }
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#endif /* CONFIG_DYNAMIC_FTRACE */
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/* totally disable ftrace - can not re-enable after this */
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void ftrace_kill(void);
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static inline void tracer_disable(void)
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{
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#ifdef CONFIG_FUNCTION_TRACER
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ftrace_enabled = 0;
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#endif
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}
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/*
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* Ftrace disable/restore without lock. Some synchronization mechanism
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* must be used to prevent ftrace_enabled to be changed between
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* disable/restore.
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*/
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static inline int __ftrace_enabled_save(void)
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{
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#ifdef CONFIG_FUNCTION_TRACER
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int saved_ftrace_enabled = ftrace_enabled;
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ftrace_enabled = 0;
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return saved_ftrace_enabled;
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#else
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return 0;
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#endif
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}
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static inline void __ftrace_enabled_restore(int enabled)
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{
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#ifdef CONFIG_FUNCTION_TRACER
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ftrace_enabled = enabled;
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#endif
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}
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#ifdef CONFIG_FRAME_POINTER
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/* TODO: need to fix this for ARM */
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# define CALLER_ADDR0 ((unsigned long)__builtin_return_address(0))
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# define CALLER_ADDR1 ((unsigned long)__builtin_return_address(1))
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# define CALLER_ADDR2 ((unsigned long)__builtin_return_address(2))
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# define CALLER_ADDR3 ((unsigned long)__builtin_return_address(3))
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# define CALLER_ADDR4 ((unsigned long)__builtin_return_address(4))
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# define CALLER_ADDR5 ((unsigned long)__builtin_return_address(5))
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# define CALLER_ADDR6 ((unsigned long)__builtin_return_address(6))
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#else
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# define CALLER_ADDR0 ((unsigned long)__builtin_return_address(0))
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# define CALLER_ADDR1 0UL
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# define CALLER_ADDR2 0UL
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# define CALLER_ADDR3 0UL
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# define CALLER_ADDR4 0UL
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# define CALLER_ADDR5 0UL
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# define CALLER_ADDR6 0UL
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#endif
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#ifdef CONFIG_IRQSOFF_TRACER
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extern void time_hardirqs_on(unsigned long a0, unsigned long a1);
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extern void time_hardirqs_off(unsigned long a0, unsigned long a1);
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#else
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# define time_hardirqs_on(a0, a1) do { } while (0)
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# define time_hardirqs_off(a0, a1) do { } while (0)
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#endif
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#ifdef CONFIG_PREEMPT_TRACER
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extern void trace_preempt_on(unsigned long a0, unsigned long a1);
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extern void trace_preempt_off(unsigned long a0, unsigned long a1);
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#else
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# define trace_preempt_on(a0, a1) do { } while (0)
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# define trace_preempt_off(a0, a1) do { } while (0)
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#endif
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#ifdef CONFIG_TRACING
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extern int ftrace_dump_on_oops;
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extern void
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ftrace_special(unsigned long arg1, unsigned long arg2, unsigned long arg3);
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/**
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* ftrace_printk - printf formatting in the ftrace buffer
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* @fmt: the printf format for printing
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*
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* Note: __ftrace_printk is an internal function for ftrace_printk and
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* the @ip is passed in via the ftrace_printk macro.
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*
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* This function allows a kernel developer to debug fast path sections
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* that printk is not appropriate for. By scattering in various
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* printk like tracing in the code, a developer can quickly see
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* where problems are occurring.
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*
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* This is intended as a debugging tool for the developer only.
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* Please refrain from leaving ftrace_printks scattered around in
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* your code.
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*/
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# define ftrace_printk(fmt...) __ftrace_printk(_THIS_IP_, fmt)
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extern int
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__ftrace_printk(unsigned long ip, const char *fmt, ...)
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__attribute__ ((format (printf, 2, 3)));
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extern void ftrace_dump(void);
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#else
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static inline void
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ftrace_special(unsigned long arg1, unsigned long arg2, unsigned long arg3) { }
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static inline int
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ftrace_printk(const char *fmt, ...) __attribute__ ((format (printf, 1, 0)));
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static inline int
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ftrace_printk(const char *fmt, ...)
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{
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return 0;
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}
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static inline void ftrace_dump(void) { }
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#endif
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#ifdef CONFIG_FTRACE_MCOUNT_RECORD
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extern void ftrace_init(void);
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extern void ftrace_init_module(unsigned long *start, unsigned long *end);
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#else
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static inline void ftrace_init(void) { }
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static inline void
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ftrace_init_module(unsigned long *start, unsigned long *end) { }
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#endif
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struct boot_trace {
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pid_t caller;
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char func[KSYM_NAME_LEN];
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int result;
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unsigned long long duration; /* usecs */
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ktime_t calltime;
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ktime_t rettime;
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};
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#ifdef CONFIG_BOOT_TRACER
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extern void trace_boot(struct boot_trace *it, initcall_t fn);
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extern void start_boot_trace(void);
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extern void stop_boot_trace(void);
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#else
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static inline void trace_boot(struct boot_trace *it, initcall_t fn) { }
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static inline void start_boot_trace(void) { }
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static inline void stop_boot_trace(void) { }
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#endif
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#endif /* _LINUX_FTRACE_H */
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