1#@!#!123s

: / usr / share / systemtap / tapset / linux /
Filename : sysc_copy_file_range.stp
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# copy_file_range ___________________________________________
# SYSCALL_DEFINE6(copy_file_range, int, fd_in, loff_t __user *, off_in,
#		int, fd_out, loff_t __user *, off_out,
#		size_t, len, unsigned int, flags)

@define _SYSCALL_COPY_FILE_RANGE_NAME
%(
	name = "copy_file_range"
%)

@define _SYSCALL_COPY_FILE_RANGE_ARGSTR
%(
	argstr = sprintf("%d, %p, %d, %p, %u, 0x%x", fd_in, off_in, fd_out,
	                 off_out, len, flags)
%)

@define _SYSCALL_COPY_FILE_RANGE_REGARGS
%(
	fd_in = int_arg(1)
	off_in = pointer_arg(2)
	fd_out = int_arg(3)
	off_out = pointer_arg(4)
	len = ulong_arg(5)
	flags = uint_arg(6)
%)

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

# dw_copy_file_range _____________________________________________________

probe dw_syscall.copy_file_range = kernel.function("sys_copy_file_range").call ?
{
	@_SYSCALL_COPY_FILE_RANGE_NAME
	fd_in = __int32($fd_in)
	off_in = @__pointer($off_in)
	fd_out = __int32($fd_out)
	off_out = @__pointer($off_out)
	len = __ulong($len)
	flags = __uint32($flags)
	@_SYSCALL_COPY_FILE_RANGE_ARGSTR
}
probe dw_syscall.copy_file_range.return =
	kernel.function("sys_copy_file_range").return ?
{
	@_SYSCALL_COPY_FILE_RANGE_NAME
	@SYSC_RETVALSTR($return)
}

# nd_copy_file_range _____________________________________________________

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

probe nd1_syscall.copy_file_range =
	kprobe.function("sys_copy_file_range").call ?
{
	@_SYSCALL_COPY_FILE_RANGE_NAME
	@_SYSCALL_COPY_FILE_RANGE_REGARGS
	@_SYSCALL_COPY_FILE_RANGE_ARGSTR
}

/* kernel 4.17+ */
probe nd2_syscall.copy_file_range = kprobe.function(@arch_syscall_prefix "sys_copy_file_range") ?
{
	__set_syscall_pt_regs(pointer_arg(1))
	@_SYSCALL_COPY_FILE_RANGE_NAME
	@_SYSCALL_COPY_FILE_RANGE_REGARGS
	@_SYSCALL_COPY_FILE_RANGE_ARGSTR
}

/* kernel 3.5+, but undesirable because it affects all syscalls */
probe tp_syscall.copy_file_range = kernel.trace("sys_enter")
{
	__set_syscall_pt_regs($regs)
	@__syscall_compat_gate(@const("__NR_copy_file_range"), @const("__NR_compat_copy_file_range"))
	@_SYSCALL_COPY_FILE_RANGE_NAME
	@_SYSCALL_COPY_FILE_RANGE_REGARGS
	@_SYSCALL_COPY_FILE_RANGE_ARGSTR
}

probe nd_syscall.copy_file_range.return = nd1_syscall.copy_file_range.return!, nd2_syscall.copy_file_range.return!, tp_syscall.copy_file_range.return
  { }
  
probe nd1_syscall.copy_file_range.return =
	kprobe.function("sys_copy_file_range").return ?
{
	@_SYSCALL_COPY_FILE_RANGE_NAME
	@SYSC_RETVALSTR(returnval())
}

/* kernel 4.17+ */
probe nd2_syscall.copy_file_range.return = kprobe.function(@arch_syscall_prefix "sys_copy_file_range").return ?
{
	@_SYSCALL_COPY_FILE_RANGE_NAME
	@SYSC_RETVALSTR(returnval())
}
 
/* kernel 3.5+, but undesirable because it affects all syscalls */
probe tp_syscall.copy_file_range.return = kernel.trace("sys_exit")
{
	__set_syscall_pt_regs($regs)
	@__syscall_compat_gate(@const("__NR_copy_file_range"), @const("__NR_compat_copy_file_range"))
	@_SYSCALL_COPY_FILE_RANGE_NAME
	@SYSC_RETVALSTR($ret)
}