/usr/share/systemtap/tapset/linux/x86_64/ Current File: //usr/share/systemtap/tapset/linux/x86_64/sysc_mmap.stp
# In kernels < 2.6.33, mmap()/mmap2() was handled by arch-specific
# code.  In kernels >= 2.6.33, the arch-specific code just calls
# generic sys_mmap_pgoff().
%( kernel_v < "2.6.33" %?
# mmap
# long sys_mmap(unsigned long addr, unsigned long len,
#          unsigned long prot, unsigned long flags,
#          unsigned long fd, unsigned long off)

@define _SYSCALL_MMAP_NAME
%(
	name = "mmap"
%)

@define _SYSCALL_MMAP_ARGSTR
%(
	argstr = sprintf("%p, %u, %s, %s, %d, %d", start, len,
	                 prot_str, flags_str, fd, offset)
%)

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

# dw_mmap _____________________________________________________

probe dw_syscall.mmap = kernel.function("sys_mmap") ?
{
	@_SYSCALL_MMAP_NAME
	start = $addr
	len = $len
	prot = $prot
	prot_str = _mprotect_prot_str(prot)
	flags = $flags
	flags_str = _mmap_flags(flags)
	# Although the kernel gets an unsigned long fd, on the
	# user-side it is a signed int.  Fix this.
	fd = __int32($fd)
	offset = $off
	@_SYSCALL_MMAP_ARGSTR
}

probe dw_syscall.mmap.return = kernel.function("sys_mmap").return ?
{
	@_SYSCALL_MMAP_NAME
	@SYSC_RETVALSTR2($return)
}

# nd_mmap _____________________________________________________

probe nd_syscall.mmap = kprobe.function("sys_mmap") ?
{
	@_SYSCALL_MMAP_NAME
	asmlinkage()
	start = ulong_arg(1)
	len = ulong_arg(2)
	prot = ulong_arg(3)
	prot_str = _mprotect_prot_str(prot)
	flags = ulong_arg(4)
	flags_str = _mmap_flags(flags)
	# Although the kernel gets an unsigned long fd, on the
	# user-side it is a signed int.  Fix this.
	fd = int_arg(5)
	offset = ulong_arg(6)
	@_SYSCALL_MMAP_ARGSTR
}
probe nd_syscall.mmap.return = kprobe.function("sys_mmap").return ?
{
	@_SYSCALL_MMAP_NAME
	@SYSC_RETVALSTR2(returnval())
}

#
# sys32_mmap(struct mmap_arg_struct32 __user *arg)
# sys32_mmap(struct mmap_arg_struct __user *arg)
#

probe syscall.mmap32 = dw_syscall.mmap32 !, nd_syscall.mmap32 {}
probe syscall.mmap32.return = dw_syscall.mmap32.return !, nd_syscall.mmap32.return {}

# dw_mmap32 _____________________________________________________

probe dw_syscall.mmap32 = kernel.function("sys32_mmap")
{
	@_SYSCALL_MMAP_NAME
#
# Work around PR20672 by commenting out code relying on mmap_arg_struct32.
# In the vanilla kernel, this struct seems to appear firstly in commit
# a4679373c, which resolves to v2.6.34-rc1-53-ga467937.  But NB the parent
# kernel_v condition above.
#
#	if (@defined(@cast($arg, "mmap_arg_struct32")->addr)) {
#		start = user_long(&@cast($arg, "mmap_arg_struct32")->addr)
#		len = user_long(&@cast($arg, "mmap_arg_struct32")->len)
#		prot = user_long(&@cast($arg, "mmap_arg_struct32")->prot)
#		flags = user_long(&@cast($arg, "mmap_arg_struct32")->flags)
#		fd = user_long(&@cast($arg, "mmap_arg_struct32")->fd)
#		offset = user_long(&@cast($arg, "mmap_arg_struct32")->offset)
#	}
#	else {
		start = user_long(&@cast($arg, "mmap_arg_struct")->addr)
		len = user_long(&@cast($arg, "mmap_arg_struct")->len)
		prot = user_long(&@cast($arg, "mmap_arg_struct")->prot)
		flags = user_long(&@cast($arg, "mmap_arg_struct")->flags)
		fd = user_long(&@cast($arg, "mmap_arg_struct")->fd)
		offset = user_long(&@cast($arg, "mmap_arg_struct")->offset)
#	}
	prot_str = _mprotect_prot_str(prot)
	flags_str = _mmap_flags(flags)
	@_SYSCALL_MMAP_ARGSTR
}

probe dw_syscall.mmap32.return = kernel.function("sys32_mmap").return
{
        @_SYSCALL_MMAP_NAME
        @SYSC_RETVALSTR2($return)
}

# nd_mmap32 _____________________________________________________

probe nd_syscall.mmap32 = kprobe.function("sys32_mmap")
{
	@_SYSCALL_MMAP_NAME
	asmlinkage()
	__args = &@uint_cast(pointer_arg(1))
	start = user_uint32(&(__args)[0])
	len = user_uint32(&(__args)[1])
	prot = user_uint32(&(__args)[2])
	flags = user_uint32(&(__args)[3])
	fd = user_int(&(__args)[4])
	offset = user_uint32(&(__args)[5])
	prot_str = _mprotect_prot_str(prot)
	flags_str = _mmap_flags(flags)
	@_SYSCALL_MMAP_ARGSTR
}
probe nd_syscall.mmap32.return = kprobe.function("sys32_mmap").return
{
	@_SYSCALL_MMAP_NAME
	@SYSC_RETVALSTR2(returnval())
}
%)