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Filename : sysc_remap_file_pages.stp
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# remap_file_pages ___________________________________________
#
# long sys_remap_file_pages(unsigned long start,
#			    unsigned long size,
#			    unsigned long __prot,
#			    unsigned long pgoff,
#			    unsigned long flags)
#

@define _SYSCALL_REMAP_FILE_PAGES_NAME
%(
	name = "remap_file_pages"
%)

@define _SYSCALL_REMAP_FILE_PAGES_ARGSTR
%(
	argstr = sprintf("%p, %p, %s, %p, %s", start, size, prot_str, pgoff, flags_str)
%)

@define _SYSCALL_REMAP_FILE_PAGES_REGARGS
%(
	start = ulong_arg(1)
	size = ulong_arg(2)
	prot = ulong_arg(3)
	prot_str = _mprotect_prot_str(prot)
	pgoff = ulong_arg(4)
	flags = ulong_arg(5)
	flags_str = _mmap_flags(flags)
%)

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

# dw_remap_file_pages _____________________________________________________

probe dw_syscall.remap_file_pages = kernel.function("sys_remap_file_pages").call ?
{
	@_SYSCALL_REMAP_FILE_PAGES_NAME
	start = __ulong($start)
	size = __ulong($size)
	prot = __ulong(@choose_defined($prot, $__prot))
	prot_str = _mprotect_prot_str(prot)
	pgoff = __ulong($pgoff)
	flags = __ulong($flags)
	flags_str = _mmap_flags(flags)
	@_SYSCALL_REMAP_FILE_PAGES_ARGSTR
}
probe dw_syscall.remap_file_pages.return = kernel.function("sys_remap_file_pages").return ?
{
	@_SYSCALL_REMAP_FILE_PAGES_NAME
	@SYSC_RETVALSTR($return)
}

# nd_remap_file_pages _____________________________________________________

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

probe nd1_syscall.remap_file_pages = kprobe.function("sys_remap_file_pages") ?
{
	@_SYSCALL_REMAP_FILE_PAGES_NAME
	asmlinkage()
	@_SYSCALL_REMAP_FILE_PAGES_REGARGS
	@_SYSCALL_REMAP_FILE_PAGES_ARGSTR
}

/* kernel 4.17+ */
probe nd2_syscall.remap_file_pages = kprobe.function(@arch_syscall_prefix "sys_remap_file_pages") ?
{
	__set_syscall_pt_regs(pointer_arg(1))
	@_SYSCALL_REMAP_FILE_PAGES_NAME
	@_SYSCALL_REMAP_FILE_PAGES_REGARGS
	@_SYSCALL_REMAP_FILE_PAGES_ARGSTR
}

/* kernel 3.5+, but undesirable because it affects all syscalls */
probe tp_syscall.remap_file_pages = kernel.trace("sys_enter")
{
	__set_syscall_pt_regs($regs)
	@__syscall_compat_gate(@const("__NR_remap_file_pages"), @const("__NR_compat_remap_file_pages"))
	@_SYSCALL_REMAP_FILE_PAGES_NAME
	@_SYSCALL_REMAP_FILE_PAGES_REGARGS
	@_SYSCALL_REMAP_FILE_PAGES_ARGSTR
}

probe nd_syscall.remap_file_pages.return = nd1_syscall.remap_file_pages.return!, nd2_syscall.remap_file_pages.return!, tp_syscall.remap_file_pages.return
  { }
  
probe nd1_syscall.remap_file_pages.return = kprobe.function("sys_remap_file_pages").return ?
{
	@_SYSCALL_REMAP_FILE_PAGES_NAME
	@SYSC_RETVALSTR(returnval())
}

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