[mirror_ubuntu-artful-kernel.git] / arch / x86 / include / asm / mpx.h

#ifndef _ASM_X86_MPX_H
#define _ASM_X86_MPX_H

#include <linux/types.h>
#include <linux/mm_types.h>

#include <asm/ptrace.h>
#include <asm/insn.h>

/*
 * NULL is theoretically a valid place to put the bounds
 * directory, so point this at an invalid address.
 */
#define MPX_INVALID_BOUNDS_DIR	((void __user *)-1)
#define MPX_BNDCFG_ENABLE_FLAG	0x1
#define MPX_BD_ENTRY_VALID_FLAG	0x1

/*
 * The upper 28 bits [47:20] of the virtual address in 64-bit
 * are used to index into bounds directory (BD).
 *
 * The directory is 2G (2^31) in size, and with 8-byte entries
 * it has 2^28 entries.
 */
#define MPX_BD_SIZE_BYTES_64	(1UL<<31)
#define MPX_BD_ENTRY_BYTES_64	8
#define MPX_BD_NR_ENTRIES_64	(MPX_BD_SIZE_BYTES_64/MPX_BD_ENTRY_BYTES_64)

/*
 * The 32-bit directory is 4MB (2^22) in size, and with 4-byte
 * entries it has 2^20 entries.
 */
#define MPX_BD_SIZE_BYTES_32	(1UL<<22)
#define MPX_BD_ENTRY_BYTES_32	4
#define MPX_BD_NR_ENTRIES_32	(MPX_BD_SIZE_BYTES_32/MPX_BD_ENTRY_BYTES_32)

/*
 * A 64-bit table is 4MB total in size, and an entry is
 * 4 64-bit pointers in size.
 */
#define MPX_BT_SIZE_BYTES_64	(1UL<<22)
#define MPX_BT_ENTRY_BYTES_64	32
#define MPX_BT_NR_ENTRIES_64	(MPX_BT_SIZE_BYTES_64/MPX_BT_ENTRY_BYTES_64)

/*
 * A 32-bit table is 16kB total in size, and an entry is
 * 4 32-bit pointers in size.
 */
#define MPX_BT_SIZE_BYTES_32	(1UL<<14)
#define MPX_BT_ENTRY_BYTES_32	16
#define MPX_BT_NR_ENTRIES_32	(MPX_BT_SIZE_BYTES_32/MPX_BT_ENTRY_BYTES_32)

#define MPX_BNDSTA_TAIL		2
#define MPX_BNDCFG_TAIL		12
#define MPX_BNDSTA_ADDR_MASK	(~((1UL<<MPX_BNDSTA_TAIL)-1))
#define MPX_BNDCFG_ADDR_MASK	(~((1UL<<MPX_BNDCFG_TAIL)-1))
#define MPX_BNDSTA_ERROR_CODE	0x3

#ifdef CONFIG_X86_INTEL_MPX
siginfo_t *mpx_generate_siginfo(struct pt_regs *regs);
int mpx_handle_bd_fault(void);
static inline int kernel_managing_mpx_tables(struct mm_struct *mm)
{
	return (mm->context.bd_addr != MPX_INVALID_BOUNDS_DIR);
}
static inline void mpx_mm_init(struct mm_struct *mm)
{
	/*
	 * NULL is theoretically a valid place to put the bounds
	 * directory, so point this at an invalid address.
	 */
	mm->context.bd_addr = MPX_INVALID_BOUNDS_DIR;
}
void mpx_notify_unmap(struct mm_struct *mm, struct vm_area_struct *vma,
		      unsigned long start, unsigned long end);
#else
static inline siginfo_t *mpx_generate_siginfo(struct pt_regs *regs)
{
	return NULL;
}
static inline int mpx_handle_bd_fault(void)
{
	return -EINVAL;
}
static inline int kernel_managing_mpx_tables(struct mm_struct *mm)
{
	return 0;
}
static inline void mpx_mm_init(struct mm_struct *mm)
{
}
static inline void mpx_notify_unmap(struct mm_struct *mm,
				    struct vm_area_struct *vma,
				    unsigned long start, unsigned long end)
{
}
#endif /* CONFIG_X86_INTEL_MPX */

#endif /* _ASM_X86_MPX_H */
Commit	Line	Data
57319d80 QR	1	#ifndef _ASM_X86_MPX_H
	2	#define _ASM_X86_MPX_H
	3
	4	#include <linux/types.h>
589ee628 IM	5	#include <linux/mm_types.h>
589ee628 IM	6
57319d80	7	#include <asm/ptrace.h>
fcc7ffd6	8	#include <asm/insn.h>
57319d80	9
fe3d197f DH	10	/*
	11	* NULL is theoretically a valid place to put the bounds
	12	* directory, so point this at an invalid address.
	13	*/
	14	#define MPX_INVALID_BOUNDS_DIR ((void __user *)-1)
	15	#define MPX_BNDCFG_ENABLE_FLAG 0x1
	16	#define MPX_BD_ENTRY_VALID_FLAG 0x1
	17
613fcb7d DH	18	/*
	19	* The upper 28 bits [47:20] of the virtual address in 64-bit
	20	* are used to index into bounds directory (BD).
	21	*
	22	* The directory is 2G (2^31) in size, and with 8-byte entries
	23	* it has 2^28 entries.
57319d80	24	*/
613fcb7d DH	25	#define MPX_BD_SIZE_BYTES_64 (1UL<<31)
	26	#define MPX_BD_ENTRY_BYTES_64 8
	27	#define MPX_BD_NR_ENTRIES_64 (MPX_BD_SIZE_BYTES_64/MPX_BD_ENTRY_BYTES_64)
57319d80	28
613fcb7d DH	29	/*
	30	* The 32-bit directory is 4MB (2^22) in size, and with 4-byte
	31	* entries it has 2^20 entries.
	32	*/
	33	#define MPX_BD_SIZE_BYTES_32 (1UL<<22)
	34	#define MPX_BD_ENTRY_BYTES_32 4
	35	#define MPX_BD_NR_ENTRIES_32 (MPX_BD_SIZE_BYTES_32/MPX_BD_ENTRY_BYTES_32)
57319d80	36
613fcb7d DH	37	/*
	38	* A 64-bit table is 4MB total in size, and an entry is
	39	* 4 64-bit pointers in size.
	40	*/
	41	#define MPX_BT_SIZE_BYTES_64 (1UL<<22)
	42	#define MPX_BT_ENTRY_BYTES_64 32
	43	#define MPX_BT_NR_ENTRIES_64 (MPX_BT_SIZE_BYTES_64/MPX_BT_ENTRY_BYTES_64)
57319d80	44
613fcb7d DH	45	/*
	46	* A 32-bit table is 16kB total in size, and an entry is
	47	* 4 32-bit pointers in size.
	48	*/
	49	#define MPX_BT_SIZE_BYTES_32 (1UL<<14)
	50	#define MPX_BT_ENTRY_BYTES_32 16
	51	#define MPX_BT_NR_ENTRIES_32 (MPX_BT_SIZE_BYTES_32/MPX_BT_ENTRY_BYTES_32)
57319d80	52
fe3d197f DH	53	#define MPX_BNDSTA_TAIL 2
	54	#define MPX_BNDCFG_TAIL 12
	55	#define MPX_BNDSTA_ADDR_MASK (~((1UL<<MPX_BNDSTA_TAIL)-1))
fe3d197f	56	#define MPX_BNDCFG_ADDR_MASK (~((1UL<<MPX_BNDCFG_TAIL)-1))
57319d80 QR	57	#define MPX_BNDSTA_ERROR_CODE 0x3
57319d80 QR	58
fcc7ffd6	59	#ifdef CONFIG_X86_INTEL_MPX
46a6e0cf DH	60	siginfo_t mpx_generate_siginfo(struct pt_regs regs);
46a6e0cf DH	61	int mpx_handle_bd_fault(void);
fe3d197f DH	62	static inline int kernel_managing_mpx_tables(struct mm_struct *mm)
fe3d197f DH	63	{
cb02de96	64	return (mm->context.bd_addr != MPX_INVALID_BOUNDS_DIR);
fe3d197f DH	65	}
	66	static inline void mpx_mm_init(struct mm_struct *mm)
	67	{
	68	/*
	69	* NULL is theoretically a valid place to put the bounds
	70	* directory, so point this at an invalid address.
	71	*/
cb02de96	72	mm->context.bd_addr = MPX_INVALID_BOUNDS_DIR;
fe3d197f	73	}
1de4fa14 DH	74	void mpx_notify_unmap(struct mm_struct mm, struct vm_area_struct vma,
1de4fa14 DH	75	unsigned long start, unsigned long end);
fcc7ffd6	76	#else
46a6e0cf	77	static inline siginfo_t mpx_generate_siginfo(struct pt_regs regs)
fcc7ffd6 DH	78	{
	79	return NULL;
	80	}
46a6e0cf	81	static inline int mpx_handle_bd_fault(void)
fe3d197f DH	82	{
	83	return -EINVAL;
	84	}
	85	static inline int kernel_managing_mpx_tables(struct mm_struct *mm)
	86	{
	87	return 0;
	88	}
	89	static inline void mpx_mm_init(struct mm_struct *mm)
	90	{
	91	}
1de4fa14 DH	92	static inline void mpx_notify_unmap(struct mm_struct *mm,
	93	struct vm_area_struct *vma,
	94	unsigned long start, unsigned long end)
	95	{
	96	}
fcc7ffd6 DH	97	#endif /* CONFIG_X86_INTEL_MPX */
fcc7ffd6 DH	98
57319d80	99	#endif /* _ASM_X86_MPX_H */