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tracing: Add syscall tracepoints
add two tracepoints in syscall exit and entry path, conditioned on TIF_SYSCALL_FTRACE. Supports the syscall trace event code. Signed-off-by: Jason Baron <jbaron@redhat.com> Cc: Lai Jiangshan <laijs@cn.fujitsu.com> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca> Cc: Jiaying Zhang <jiayingz@google.com> Cc: Martin Bligh <mbligh@google.com> Cc: Li Zefan <lizf@cn.fujitsu.com> Cc: Masami Hiramatsu <mhiramat@redhat.com> Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
This commit is contained in:
parent
63fbdab315
commit
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3 changed files with 63 additions and 2 deletions
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@ -37,6 +37,9 @@
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#include <trace/syscall.h>
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#include <trace/syscall.h>
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DEFINE_TRACE(syscall_enter);
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DEFINE_TRACE(syscall_exit);
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#include "tls.h"
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#include "tls.h"
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enum x86_regset {
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enum x86_regset {
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@ -1498,7 +1501,7 @@ asmregparm long syscall_trace_enter(struct pt_regs *regs)
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ret = -1L;
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ret = -1L;
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if (unlikely(test_thread_flag(TIF_SYSCALL_FTRACE)))
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if (unlikely(test_thread_flag(TIF_SYSCALL_FTRACE)))
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ftrace_syscall_enter(regs);
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trace_syscall_enter(regs, regs->orig_ax);
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if (unlikely(current->audit_context)) {
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if (unlikely(current->audit_context)) {
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if (IS_IA32)
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if (IS_IA32)
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@ -1524,7 +1527,7 @@ asmregparm void syscall_trace_leave(struct pt_regs *regs)
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audit_syscall_exit(AUDITSC_RESULT(regs->ax), regs->ax);
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audit_syscall_exit(AUDITSC_RESULT(regs->ax), regs->ax);
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if (unlikely(test_thread_flag(TIF_SYSCALL_FTRACE)))
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if (unlikely(test_thread_flag(TIF_SYSCALL_FTRACE)))
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ftrace_syscall_exit(regs);
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trace_syscall_exit(regs, regs->ax);
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if (test_thread_flag(TIF_SYSCALL_TRACE))
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if (test_thread_flag(TIF_SYSCALL_TRACE))
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tracehook_report_syscall_exit(regs, 0);
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tracehook_report_syscall_exit(regs, 0);
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@ -1,8 +1,28 @@
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#ifndef _TRACE_SYSCALL_H
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#ifndef _TRACE_SYSCALL_H
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#define _TRACE_SYSCALL_H
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#define _TRACE_SYSCALL_H
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#include <linux/tracepoint.h>
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#include <asm/ptrace.h>
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#include <asm/ptrace.h>
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extern void syscall_regfunc(void);
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extern void syscall_unregfunc(void);
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DECLARE_TRACE_WITH_CALLBACK(syscall_enter,
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TP_PROTO(struct pt_regs *regs, long id),
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TP_ARGS(regs, id),
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syscall_regfunc,
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syscall_unregfunc
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);
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DECLARE_TRACE_WITH_CALLBACK(syscall_exit,
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TP_PROTO(struct pt_regs *regs, long ret),
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TP_ARGS(regs, ret),
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syscall_regfunc,
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syscall_unregfunc
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);
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/*
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/*
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* A syscall entry in the ftrace syscalls array.
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* A syscall entry in the ftrace syscalls array.
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*
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*
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@ -24,6 +24,7 @@
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#include <linux/tracepoint.h>
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#include <linux/tracepoint.h>
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#include <linux/err.h>
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#include <linux/err.h>
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#include <linux/slab.h>
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#include <linux/slab.h>
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#include <linux/sched.h>
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extern struct tracepoint __start___tracepoints[];
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extern struct tracepoint __start___tracepoints[];
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extern struct tracepoint __stop___tracepoints[];
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extern struct tracepoint __stop___tracepoints[];
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@ -577,3 +578,40 @@ static int init_tracepoints(void)
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__initcall(init_tracepoints);
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__initcall(init_tracepoints);
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#endif /* CONFIG_MODULES */
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#endif /* CONFIG_MODULES */
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static DEFINE_MUTEX(regfunc_mutex);
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static int sys_tracepoint_refcount;
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void syscall_regfunc(void)
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{
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unsigned long flags;
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struct task_struct *g, *t;
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mutex_lock(®func_mutex);
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if (!sys_tracepoint_refcount) {
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read_lock_irqsave(&tasklist_lock, flags);
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do_each_thread(g, t) {
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set_tsk_thread_flag(t, TIF_SYSCALL_FTRACE);
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} while_each_thread(g, t);
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read_unlock_irqrestore(&tasklist_lock, flags);
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}
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sys_tracepoint_refcount++;
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mutex_unlock(®func_mutex);
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}
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void syscall_unregfunc(void)
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{
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unsigned long flags;
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struct task_struct *g, *t;
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mutex_lock(®func_mutex);
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sys_tracepoint_refcount--;
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if (!sys_tracepoint_refcount) {
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read_lock_irqsave(&tasklist_lock, flags);
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do_each_thread(g, t) {
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clear_tsk_thread_flag(t, TIF_SYSCALL_FTRACE);
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} while_each_thread(g, t);
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read_unlock_irqrestore(&tasklist_lock, flags);
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}
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mutex_unlock(®func_mutex);
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}
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