1#@!#!123s

: / usr / share / systemtap / tapset / linux /
Filename : sysc_pipe.stp
back
# pipe _______________________________________________________
#
# asmlinkage int sys_pipe(unsigned long __user * fildes)
# asmlinkage long sys_ia64_pipe (void)
# SYSCALL_DEFINE2(pipe2, int __user *, fildes, int, flags)
# pipe2() was added to Linux in version 2.6.27.

probe syscall.pipe = dw_syscall.pipe !, nd_syscall.pipe ? {}
probe syscall.pipe.return = dw_syscall.pipe.return !, nd_syscall.pipe.return ? {}

# dw_pipe _____________________________________________________

probe dw_syscall.pipe = __syscall.pipe2 ?, __syscall.ia64_pipe ?, __syscall.pipe
{
}
probe __syscall.pipe2 = kernel.function("sys_pipe2").call ?
{
	@__syscall_compat_gate(@const("__NR_pipe2"), @const("__NR_compat_pipe2"))
	name = "pipe2"
	flags = __int32($flags)
	flag_str = _sys_pipe2_flag_str(flags);
	fildes_uaddr = $fildes
	if (fildes_uaddr == 0) {
		pipe0 = 0;
		pipe1 = 0;
		argstr = "NULL"
	} else {
		/*
		 * Why use @cast here?  Why not just:
		 *
		 *   pipe0 = user_int(&$fildes[0]);
		 *   pipe1 = user_int(&$fildes[1]);
		 *
		 * The answer is syscall wrappers
		 * (CONFIG_SYSCALL_WRAPPERS).  On ppc (for example),
		 * SyS_foo has all "long" arguments, and then the
		 * inline SYSC_foo has the real argument types.  The
		 * @cast makes sure we're dealing with the "final"
		 * type.
		 */
		pipe0 = user_int(&@cast($fildes, "int")[0])
		pipe1 = user_int(&@cast($fildes, "int")[1])
		argstr = sprintf("[%d, %d], %s", pipe0, pipe1, flag_str);
	}
}
probe __syscall.ia64_pipe = kernel.function("sys_ia64_pipe").call ?
{
	name = "pipe"
	flags = 0
	flag_str = ""
	fildes_uaddr = 0
	pipe0 = 0;
	pipe1 = 0;
	argstr = "[0, 0]";
}
probe __syscall.pipe = kernel.function("sys_pipe").call
{
	name = "pipe"
	flags = 0
	flag_str = ""
	fildes_uaddr = $fildes
	if (fildes_uaddr == 0) {
		pipe0 = 0;
		pipe1 = 0;
		argstr = "NULL"
	} else {
		/*
		 * Why use @cast here?  Why not just:
		 *
		 *   pipe0 = user_int(&$fildes[0]);
		 *   pipe1 = user_int(&$fildes[1]);
		 *
		 * The answer is syscall wrappers
		 * (CONFIG_SYSCALL_WRAPPERS).  On ppc (for example),
		 * SyS_foo has all "long" arguments, and then the
		 * inline SYSC_foo has the real argument types.  The
		 * @cast makes sure we're dealing with the "final"
		 * type.
		 */
		pipe0 = user_int(&@cast($fildes, "int")[0])
		pipe1 = user_int(&@cast($fildes, "int")[1])
		argstr = sprintf("[%d, %d]", pipe0, pipe1);
	}
}
probe dw_syscall.pipe.return = __syscall.pipe2.return ?,
			    __syscall.ia64_pipe.return ?,
			    __syscall.pipe.return
{
}
probe __syscall.pipe2.return = kernel.function("sys_pipe2").return ?
{
	@__syscall_compat_gate(@const("__NR_pipe2"), @const("__NR_compat_pipe2"))
	name = "pipe2"
	fildes_uaddr = @entry($fildes)
	if (fildes_uaddr == 0) {
		pipe0 = 0;
		pipe1 = 0;
	} else {
		/*
		 * See comment in dw_syscall.pipe about why @cast is used
		 * here.
		 */
		pipe0 = user_int(&@cast(@entry($fildes), "int")[0])
		pipe1 = user_int(&@cast(@entry($fildes), "int")[1])
	}
	@SYSC_RETVALSTR($return)
}
probe __syscall.ia64_pipe.return = kernel.function("sys_ia64_pipe").return ?
{
	name = "pipe"
	fildes_uaddr = 0;
	pipe0 = _ia64_pipe0();
	pipe1 = _ia64_pipe1();

        @SYSC_RETVALSTR($return)
        if (pipe0 >= 0) { retstr = "0" }
}
probe __syscall.pipe.return = kernel.function("sys_pipe").return
{
	name = "pipe"
	fildes_uaddr = @entry($fildes)
	if (fildes_uaddr == 0) {
		pipe0 = 0;
		pipe1 = 0;
	} else {
		/*
		 * See comment in dw_syscall.pipe about why @cast is used
		 * here.
		 */
		pipe0 = user_int(&@cast(@entry($fildes), "int")[0])
		pipe1 = user_int(&@cast(@entry($fildes), "int")[1])
	}
	@SYSC_RETVALSTR($return)
}

# nd_pipe _____________________________________________________

probe nd_syscall.pipe = nd1_syscall.pipe!, nd2_syscall.pipe!, tp_syscall.pipe
  { }

probe nd1_syscall.pipe = __nd1_syscall.pipe2 ?, __nd1_syscall.ia64_pipe ?,
	__nd1_syscall.pipe
{
}
probe __nd1_syscall.pipe2 = kprobe.function("sys_pipe2") ?
{
	@__syscall_compat_gate(@const("__NR_pipe2"), @const("__NR_compat_pipe2"))
	%( arch != "powerpc" %? asmlinkage() %)
	name = "pipe2";
	flags = int_arg(2)
	flag_str = _sys_pipe2_flag_str(flags);
	fildes_uaddr = pointer_arg(1)
	if (fildes_uaddr == 0) {
		pipe0 = 0;
		pipe1 = 0;
		argstr = "NULL"
	} else {
		pipe0 = _fildes_index_u(fildes_uaddr, 0)
		pipe1 = _fildes_index_u(fildes_uaddr, 1)
		argstr = sprintf("[%d, %d], %s", pipe0, pipe1, flag_str);
	}
}
probe __nd1_syscall.ia64_pipe = kprobe.function("sys_ia64_pipe").call ?
{
	name = "pipe"
	flags = 0
	flag_str = ""
	fildes_uaddr = 0
	pipe0 = 0;
	pipe1 = 0;
	argstr = "[0, 0]";
}
probe __nd1_syscall.pipe = kprobe.function("sys_pipe")
{
	name = "pipe"
	flags = 0
	flag_str = ""
	%( arch != "powerpc" %? asmlinkage() %)
	fildes_uaddr = pointer_arg(1)
	if (fildes_uaddr == 0) {
		pipe0 = 0;
		pipe1 = 0;
		argstr = "NULL"
	} else {
		pipe0 = _fildes_index_u(fildes_uaddr, 0)
		pipe1 = _fildes_index_u(fildes_uaddr, 1)
		argstr = sprintf("[%d, %d]", pipe0, pipe1);
	}
}

/* kernel 4.17+ */
probe nd2_syscall.pipe = __nd2_syscall.pipe2 ?, __nd2_syscall.pipe
{
}
probe __nd2_syscall.pipe2 = kprobe.function(@arch_syscall_prefix "sys_pipe2") ?
{
	__set_syscall_pt_regs(pointer_arg(1))
	name = "pipe2";
	flags = int_arg(2)
	flag_str = _sys_pipe2_flag_str(flags);
	fildes_uaddr = pointer_arg(1)
	if (fildes_uaddr == 0) {
		pipe0 = 0;
		pipe1 = 0;
		argstr = "NULL"
	} else {
		pipe0 = _fildes_index_u(fildes_uaddr, 0)
		pipe1 = _fildes_index_u(fildes_uaddr, 1)
		argstr = sprintf("[%d, %d], %s", pipe0, pipe1, flag_str);
	}
}
probe __nd2_syscall.pipe = kprobe.function(@arch_syscall_prefix "sys_pipe")
{
	__set_syscall_pt_regs(pointer_arg(1))
	name = "pipe"
	flags = 0
	flag_str = ""
	fildes_uaddr = pointer_arg(1)
	if (fildes_uaddr == 0) {
		pipe0 = 0;
		pipe1 = 0;
		argstr = "NULL"
	} else {
		pipe0 = _fildes_index_u(fildes_uaddr, 0)
		pipe1 = _fildes_index_u(fildes_uaddr, 1)
		argstr = sprintf("[%d, %d]", pipe0, pipe1);
	}
}

/* kernel 3.5+, but undesirable because it affects all syscalls */
probe tp_syscall.pipe = __tp_syscall.pipe2 ?, __tp_syscall.pipe
{
}
probe __tp_syscall.pipe2 = kernel.trace("sys_enter")
{
	__set_syscall_pt_regs($regs)
	@__syscall_compat_gate(@const("__NR_pipe2"), @const("__NR_compat_pipe2"))
	name = "pipe2";
	flags = int_arg(2)
	flag_str = _sys_pipe2_flag_str(flags);
	fildes_uaddr = pointer_arg(1)
	if (fildes_uaddr == 0) {
		pipe0 = 0;
		pipe1 = 0;
		argstr = "NULL"
	} else {
		pipe0 = _fildes_index_u(fildes_uaddr, 0)
		pipe1 = _fildes_index_u(fildes_uaddr, 1)
		argstr = sprintf("[%d, %d], %s", pipe0, pipe1, flag_str);
	}
}
probe __tp_syscall.pipe = kernel.trace("sys_enter")
{
	__set_syscall_pt_regs($regs)
	@__syscall_compat_gate(@const("__NR_pipe"), @const("__NR_compat_pipe"))
	name = "pipe"
	flags = 0
	flag_str = ""
	fildes_uaddr = pointer_arg(1)
	if (fildes_uaddr == 0) {
		pipe0 = 0;
		pipe1 = 0;
		argstr = "NULL"
	} else {
		pipe0 = _fildes_index_u(fildes_uaddr, 0)
		pipe1 = _fildes_index_u(fildes_uaddr, 1)
		argstr = sprintf("[%d, %d]", pipe0, pipe1);
	}
}

probe nd_syscall.pipe.return = nd1_syscall.pipe.return!, nd2_syscall.pipe.return!, tp_syscall.pipe.return
  { }
  
probe nd1_syscall.pipe.return = __nd1_syscall.pipe2.return ?,
			        __nd1_syscall.ia64_pipe.return ?,
                                __nd1_syscall.pipe.return
{
}
probe __nd1_syscall.pipe2.return = kprobe.function("sys_pipe2").return ?
{
	@__syscall_compat_gate(@const("__NR_pipe2"), @const("__NR_compat_pipe2"))
	name = "pipe2";
	fildes_uaddr = @entry(pointer_arg(1))
	if (fildes_uaddr == 0) {
		pipe0 = 0;
		pipe1 = 0;
	} else {
		pipe0 = _fildes_index_u(fildes_uaddr, 0)
		pipe1 = _fildes_index_u(fildes_uaddr, 1)
	}
	@SYSC_RETVALSTR(returnval())
}
probe __nd1_syscall.ia64_pipe.return = kprobe.function("sys_ia64_pipe").return ?
{
	name = "pipe"
	fildes_uaddr = 0;
	pipe0 = _ia64_pipe0();
	pipe1 = _ia64_pipe1();
        @SYSC_RETVALSTR(returnval())
        if (pipe0 >= 0) { retstr = "0" }
}
probe __nd1_syscall.pipe.return = kprobe.function("sys_pipe").return
{
	name = "pipe"
	fildes_uaddr = @entry(%( arch != "powerpc" %? __asmlinkage_int_arg(1)
					    %: int_arg(1) %))
	if (fildes_uaddr == 0) {
		pipe0 = 0;
		pipe1 = 0;
	} else {
		pipe0 = _fildes_index_u(fildes_uaddr, 0)
		pipe1 = _fildes_index_u(fildes_uaddr, 1)
	}
	@SYSC_RETVALSTR(returnval())
}

/* kernel 4.17+ */
probe nd2_syscall.pipe.return = __nd2_syscall.pipe2.return ?,
                                __nd2_syscall.pipe.return
{
}
probe __nd2_syscall.pipe2.return = kprobe.function(@arch_syscall_prefix "sys_pipe2").return ?
{
	name = "pipe2";
	__set_syscall_pt_regs(@entry(pointer_arg(1)))
	fildes_uaddr = pointer_arg(1)
	if (fildes_uaddr == 0) {
		pipe0 = 0;
		pipe1 = 0;
	} else {
		pipe0 = _fildes_index_u(fildes_uaddr, 0)
		pipe1 = _fildes_index_u(fildes_uaddr, 1)
	}
	@SYSC_RETVALSTR(returnval())
}
probe __nd2_syscall.pipe.return = kprobe.function(@arch_syscall_prefix "sys_pipe").return
{
	name = "pipe"
	__set_syscall_pt_regs(@entry(pointer_arg(1)))
	fildes_uaddr = int_arg(1)
	if (fildes_uaddr == 0) {
		pipe0 = 0;
		pipe1 = 0;
	} else {
		pipe0 = _fildes_index_u(fildes_uaddr, 0)
		pipe1 = _fildes_index_u(fildes_uaddr, 1)
	}
	@SYSC_RETVALSTR(returnval())
}

/* kernel 3.5+, but undesirable because it affects all syscalls */
probe tp_syscall.pipe.return = __tp_syscall.pipe2.return ?,
                               __tp_syscall.pipe.return
{
}
probe __tp_syscall.pipe2.return = kernel.trace("sys_exit")
{
	__set_syscall_pt_regs($regs)
	@__syscall_compat_gate(@const("__NR_pipe2"), @const("__NR_compat_pipe2"))
	name = "pipe2";
	fildes_uaddr = pointer_arg(1)
	if (fildes_uaddr == 0) {
		pipe0 = 0;
		pipe1 = 0;
	} else {
		pipe0 = _fildes_index_u(fildes_uaddr, 0)
		pipe1 = _fildes_index_u(fildes_uaddr, 1)
	}
	@SYSC_RETVALSTR($ret)
}
probe __tp_syscall.pipe.return = kernel.trace("sys_exit")
{
	__set_syscall_pt_regs($regs)
	@__syscall_compat_gate(@const("__NR_pipe"), @const("__NR_compat_pipe"))
	name = "pipe"
	fildes_uaddr = int_arg(1)
	if (fildes_uaddr == 0) {
		pipe0 = 0;
		pipe1 = 0;
	} else {
		pipe0 = _fildes_index_u(fildes_uaddr, 0)
		pipe1 = _fildes_index_u(fildes_uaddr, 1)
	}
	@SYSC_RETVALSTR($ret)
}