Flags Interface

There are several functions that provide more information about the flags read and written. More...

Data Structures
union	xed_flag_dfv_s
struct	xed_flag_enum_s
union	xed_flag_set_s
struct	xed_simple_flag_s

Typedefs
typedef union xed_flag_dfv_s	xed_flag_dfv_t

Flag-set accessors
typedef struct xed_flag_enum_s	xed_flag_action_t
XED_DLL_EXPORT int	xed_flag_set_print (const xed_flag_set_t *p, char *buf, int buflen)
XED_DLL_EXPORT xed_bool_t	xed_flag_set_is_subset_of (const xed_flag_set_t *p, const xed_flag_set_t *other)

Lowest-level flag-action accessors
typedef struct xed_simple_flag_s	xed_simple_flag_t
XED_DLL_EXPORT xed_flag_enum_t	xed_flag_action_get_flag_name (const xed_flag_action_t *p)
XED_DLL_EXPORT xed_flag_action_enum_t	xed_flag_action_get_action (const xed_flag_action_t *p, unsigned int i)
XED_DLL_EXPORT xed_bool_t	xed_flag_action_action_invalid (const xed_flag_action_enum_t a)
XED_DLL_EXPORT int	xed_flag_action_print (const xed_flag_action_t *p, char *buf, int buflen)
XED_DLL_EXPORT xed_bool_t	xed_flag_action_read_flag (const xed_flag_action_t *p)
XED_DLL_EXPORT xed_bool_t	xed_flag_action_writes_flag (const xed_flag_action_t *p)
XED_DLL_EXPORT xed_bool_t	xed_flag_action_read_action (xed_flag_action_enum_t a)
XED_DLL_EXPORT xed_bool_t	xed_flag_action_write_action (xed_flag_action_enum_t a)

Accessing the simple flags (Mid-level access)
XED_DLL_EXPORT unsigned int	xed_simple_flag_get_nflags (const xed_simple_flag_t *p)
const XED_DLL_EXPORT xed_flag_set_t *	xed_simple_flag_get_read_flag_set (const xed_simple_flag_t *p)
const XED_DLL_EXPORT xed_flag_set_t *	xed_simple_flag_get_written_flag_set (const xed_simple_flag_t *p)
const XED_DLL_EXPORT xed_flag_set_t *	xed_simple_flag_get_undefined_flag_set (const xed_simple_flag_t *p)
XED_DLL_EXPORT xed_bool_t	xed_simple_flag_get_may_write (const xed_simple_flag_t *p)
XED_DLL_EXPORT xed_bool_t	xed_simple_flag_get_must_write (const xed_simple_flag_t *p)
const XED_DLL_EXPORT xed_flag_action_t *	xed_simple_flag_get_flag_action (const xed_simple_flag_t *p, unsigned int i)
XED_DLL_EXPORT xed_bool_t	xed_simple_flag_reads_flags (const xed_simple_flag_t *p)
XED_DLL_EXPORT xed_bool_t	xed_simple_flag_writes_flags (const xed_simple_flag_t *p)
XED_DLL_EXPORT int	xed_simple_flag_print (const xed_simple_flag_t *p, char *buf, int buflen)
static XED_INLINE unsigned int	xed_flag_set_mask (const xed_flag_set_t *p)

Detailed Description

There are several functions that provide more information about the flags read and written.

The flags are available from the xed_decoded_inst_t via the xed_decoded_inst_get_rflags_info() function which returns a xed_simple_flag_t pointer.

The type xed_flag_set_t keeps the integer flags in the order specified by the RFLAGS register. The x87 flags are stored in the most significant 4 bits of the flag set. This should not affect use by the normal integer operations; Those bits are reserved as zero in the RFLAGS.

Typedef Documentation

xed_flag_action_t

typedef struct xed_flag_enum_s xed_flag_action_t

Associated with each flag field there can be one action.

xed_flag_dfv_t

typedef union xed_flag_dfv_s xed_flag_dfv_t

a struct representing an instruction's default flags values

xed_simple_flag_t

typedef struct xed_simple_flag_s xed_simple_flag_t

A collection of xed_flag_action_t's and unions of read and written flags

Function Documentation

xed_flag_action_action_invalid()

XED_DLL_EXPORT xed_bool_t xed_flag_action_action_invalid

(

const xed_flag_action_enum_t

a

)

returns true if the specified action is invalid. Only the 2nd flag might be invalid.

xed_flag_action_get_action()

XED_DLL_EXPORT xed_flag_action_enum_t xed_flag_action_get_action	(	const xed_flag_action_t *	p,
		unsigned int	i
	)

return the action

xed_flag_action_get_flag_name()

XED_DLL_EXPORT xed_flag_enum_t xed_flag_action_get_flag_name

(

const xed_flag_action_t *

p

)

get the name of the flag

xed_flag_action_print()

XED_DLL_EXPORT int xed_flag_action_print	(	const xed_flag_action_t *	p,
		char *	buf,
		int	buflen
	)

print the flag & actions

xed_flag_action_read_action()

XED_DLL_EXPORT xed_bool_t xed_flag_action_read_action

(

xed_flag_action_enum_t

a

)

test to see if the specific action is a read

xed_flag_action_read_flag()

XED_DLL_EXPORT xed_bool_t xed_flag_action_read_flag

(

const xed_flag_action_t *

p

)

returns true if either action is a read

xed_flag_action_write_action()

XED_DLL_EXPORT xed_bool_t xed_flag_action_write_action

(

xed_flag_action_enum_t

a

)

test to see if a specific action is a write

xed_flag_action_writes_flag()

XED_DLL_EXPORT xed_bool_t xed_flag_action_writes_flag

(

const xed_flag_action_t *

p

)

returns true if either action is a write

xed_flag_set_is_subset_of()

XED_DLL_EXPORT xed_bool_t xed_flag_set_is_subset_of	(	const xed_flag_set_t *	p,
		const xed_flag_set_t *	other
	)

returns true if this object has a subset of the flags of the "other" object.

xed_flag_set_mask()

static XED_INLINE unsigned int xed_flag_set_mask ( const xed_flag_set_t *  p )

static

Return the flags as a mask

xed_flag_set_print()

XED_DLL_EXPORT int xed_flag_set_print	(	const xed_flag_set_t *	p,
		char *	buf,
		int	buflen
	)

print the flag set in the supplied buffer

xed_simple_flag_get_flag_action()

const XED_DLL_EXPORT xed_flag_action_t* xed_simple_flag_get_flag_action	(	const xed_simple_flag_t *	p,
		unsigned int	i
	)

return the specific flag-action. Very detailed low level information

xed_simple_flag_get_may_write()

XED_DLL_EXPORT xed_bool_t xed_simple_flag_get_may_write

(

const xed_simple_flag_t *

p

)

Indicates the flags are only conditionally written. Usually MAY-writes of the flags instructions that are dependent on a REP count.

xed_simple_flag_get_must_write()

XED_DLL_EXPORT xed_bool_t xed_simple_flag_get_must_write

(

const xed_simple_flag_t *

p

)

the flags always written

xed_simple_flag_get_nflags()

XED_DLL_EXPORT unsigned int xed_simple_flag_get_nflags

(

const xed_simple_flag_t *

p

)

returns the number of flag-actions

xed_simple_flag_get_read_flag_set()

const XED_DLL_EXPORT xed_flag_set_t* xed_simple_flag_get_read_flag_set

(

const xed_simple_flag_t *

p

)

return union of bits for read flags

xed_simple_flag_get_undefined_flag_set()

const XED_DLL_EXPORT xed_flag_set_t* xed_simple_flag_get_undefined_flag_set

(

const xed_simple_flag_t *

p

)

return union of bits for undefined flags

xed_simple_flag_get_written_flag_set()

const XED_DLL_EXPORT xed_flag_set_t* xed_simple_flag_get_written_flag_set

(

const xed_simple_flag_t *

p

)

return union of bits for written flags

xed_simple_flag_print()

XED_DLL_EXPORT int xed_simple_flag_print	(	const xed_simple_flag_t *	p,
		char *	buf,
		int	buflen
	)

print the flags

xed_simple_flag_reads_flags()

XED_DLL_EXPORT xed_bool_t xed_simple_flag_reads_flags

(

const xed_simple_flag_t *

p

)

boolean test to see if flags are read, scans the flags

xed_simple_flag_writes_flags()

XED_DLL_EXPORT xed_bool_t xed_simple_flag_writes_flags

(

const xed_simple_flag_t *

p

)

boolean test to see if flags are written, scans the flags