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Filename : sysc_statx.stp
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# statx _______________________________________________________
# Syscall introduced in kernel commit a528d35e8bfcc521d7cb70aaf03e1bd296c8493f
# Author: David Howells <dhowells@redhat.com>
# Date:   Tue Jan 31 16:46:22 2017 +0000
# SYSCALL_DEFINE5(statx,
#                int, dfd, const char __user *, filename, unsigned, flags,
#                unsigned int, mask,
#                struct statx __user *, buffer)
#
# asmlinkage long sys_statx(int dfd, const char __user *path, unsigned flags,
#                           unsigned mask, struct statx __user *buffer);

@define _SYSCALL_STATX_NAME
%(
	name = "statx"
%)

@define _SYSCALL_STATX_ARGSTR
%(
	argstr = sprintf("%s, %s, %s, %s, %p", dfd_str, filename, flags_str,
	                 mask_str, buf_uaddr)
%)

@define _SYSCALL_STATX_REGARGS
%(
	dfd = int_arg(1)
	dfd_str = _dfd_str(dfd)
	filename_uaddr = pointer_arg(2)
	filename = user_string_quoted(filename_uaddr)
	flags = uint_arg(3)
	flags_str = _at_flag_str(flags)
	mask = uint_arg(4)
	mask_str = _statx_mask_str(mask)
	buf_uaddr = pointer_arg(5)
%)

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

# dw_statx _____________________________________________________

probe dw_syscall.statx = kernel.function("sys_statx").call ?
{
	@_SYSCALL_STATX_NAME
	dfd = __int32($dfd)
	dfd_str = _dfd_str(dfd)
	filename_uaddr = $filename
	filename = user_string_quoted($filename)
	flags = __uint32($flags)
	flags_str = _at_flag_str(flags)
	mask = __uint32($mask)
	mask_str = _statx_mask_str(mask)
	buf_uaddr = $buffer
	# Not pretty-printing struct statx, since it is just
	# (maybe somehow initialized) *destination* buffer.
	@_SYSCALL_STATX_ARGSTR
}
probe dw_syscall.statx.return = kernel.function("sys_statx").return ?
{
	@_SYSCALL_STATX_NAME
	@SYSC_RETVALSTR($return)
}

# nd_statx _____________________________________________________

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

probe nd1_syscall.statx = kprobe.function("sys_statx") ?
{
	@_SYSCALL_STATX_NAME
	asmlinkage()
	@_SYSCALL_STATX_REGARGS
	# Not pretty-printing struct statx, since it is just
	# (maybe somehow initialized) *destination* buffer.
	@_SYSCALL_STATX_ARGSTR
}

/* kernel 4.17+ */
probe nd2_syscall.statx = kprobe.function(@arch_syscall_prefix "sys_statx") ?
{
	__set_syscall_pt_regs(pointer_arg(1))
	@_SYSCALL_STATX_NAME
	@_SYSCALL_STATX_REGARGS
	@_SYSCALL_STATX_ARGSTR
}

/* kernel 3.5+, but undesirable because it affects all syscalls */
probe tp_syscall.statx = kernel.trace("sys_enter")
{
	__set_syscall_pt_regs($regs)
	@__syscall_compat_gate(@const("__NR_statx"), @const("__NR_compat_statx"))
	@_SYSCALL_STATX_NAME
	@_SYSCALL_STATX_REGARGS
	@_SYSCALL_STATX_ARGSTR
}

probe nd_syscall.statx.return = nd1_syscall.statx.return!, nd2_syscall.statx.return!, tp_syscall.statx.return
  { }

probe nd1_syscall.statx.return = kprobe.function("sys_statx").return ?
{
	@_SYSCALL_STATX_NAME
	@SYSC_RETVALSTR(returnval())
}

/* kernel 4.17+ */
probe nd2_syscall.statx.return = kprobe.function(@arch_syscall_prefix "sys_statx").return ?
{
	@_SYSCALL_STATX_NAME
	@SYSC_RETVALSTR(returnval())
}

/* kernel 3.5+, but undesirable because it affects all syscalls */
probe tp_syscall.statx.return = kernel.trace("sys_exit")
{
	__set_syscall_pt_regs($regs)
	@__syscall_compat_gate(@const("__NR_statx"), @const("__NR_compat_statx"))
	@_SYSCALL_STATX_NAME
	@SYSC_RETVALSTR($ret)
}