[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 <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

#ifdef CONFIG_X86_64

/* upper 28 bits [47:20] of the virtual address in 64-bit used to
 * index into bounds directory (BD).
 */
#define MPX_BD_ENTRY_OFFSET	28
#define MPX_BD_ENTRY_SHIFT	3
/* bits [19:3] of the virtual address in 64-bit used to index into
 * bounds table (BT).
 */
#define MPX_BT_ENTRY_OFFSET	17
#define MPX_BT_ENTRY_SHIFT	5
#define MPX_IGN_BITS		3
#define MPX_BD_ENTRY_TAIL	3

#else

#define MPX_BD_ENTRY_OFFSET	20
#define MPX_BD_ENTRY_SHIFT	2
#define MPX_BT_ENTRY_OFFSET	10
#define MPX_BT_ENTRY_SHIFT	4
#define MPX_IGN_BITS		2
#define MPX_BD_ENTRY_TAIL	2

#endif

#define MPX_BD_SIZE_BYTES (1UL<<(MPX_BD_ENTRY_OFFSET+MPX_BD_ENTRY_SHIFT))
#define MPX_BT_SIZE_BYTES (1UL<<(MPX_BT_ENTRY_OFFSET+MPX_BT_ENTRY_SHIFT))

#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

#define MPX_BD_ENTRY_MASK	((1<<MPX_BD_ENTRY_OFFSET)-1)
#define MPX_BT_ENTRY_MASK	((1<<MPX_BT_ENTRY_OFFSET)-1)
#define MPX_GET_BD_ENTRY_OFFSET(addr)	((((addr)>>(MPX_BT_ENTRY_OFFSET+ \
		MPX_IGN_BITS)) & MPX_BD_ENTRY_MASK) << MPX_BD_ENTRY_SHIFT)
#define MPX_GET_BT_ENTRY_OFFSET(addr)	((((addr)>>MPX_IGN_BITS) & \
		MPX_BT_ENTRY_MASK) << MPX_BT_ENTRY_SHIFT)

#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->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->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>
	5	#include <asm/ptrace.h>
fcc7ffd6	6	#include <asm/insn.h>
57319d80	7
fe3d197f DH	8	/*
	9	* NULL is theoretically a valid place to put the bounds
	10	* directory, so point this at an invalid address.
	11	*/
	12	#define MPX_INVALID_BOUNDS_DIR ((void __user *)-1)
	13	#define MPX_BNDCFG_ENABLE_FLAG 0x1
	14	#define MPX_BD_ENTRY_VALID_FLAG 0x1
	15
57319d80 QR	16	#ifdef CONFIG_X86_64
	17
	18	/* upper 28 bits [47:20] of the virtual address in 64-bit used to
	19	* index into bounds directory (BD).
	20	*/
	21	#define MPX_BD_ENTRY_OFFSET 28
	22	#define MPX_BD_ENTRY_SHIFT 3
	23	/* bits [19:3] of the virtual address in 64-bit used to index into
	24	* bounds table (BT).
	25	*/
	26	#define MPX_BT_ENTRY_OFFSET 17
	27	#define MPX_BT_ENTRY_SHIFT 5
	28	#define MPX_IGN_BITS 3
fe3d197f	29	#define MPX_BD_ENTRY_TAIL 3
57319d80 QR	30
	31	#else
	32
	33	#define MPX_BD_ENTRY_OFFSET 20
	34	#define MPX_BD_ENTRY_SHIFT 2
	35	#define MPX_BT_ENTRY_OFFSET 10
	36	#define MPX_BT_ENTRY_SHIFT 4
	37	#define MPX_IGN_BITS 2
fe3d197f	38	#define MPX_BD_ENTRY_TAIL 2
57319d80 QR	39
	40	#endif
	41
	42	#define MPX_BD_SIZE_BYTES (1UL<<(MPX_BD_ENTRY_OFFSET+MPX_BD_ENTRY_SHIFT))
	43	#define MPX_BT_SIZE_BYTES (1UL<<(MPX_BT_ENTRY_OFFSET+MPX_BT_ENTRY_SHIFT))
	44
fe3d197f DH	45	#define MPX_BNDSTA_TAIL 2
	46	#define MPX_BNDCFG_TAIL 12
	47	#define MPX_BNDSTA_ADDR_MASK (~((1UL<<MPX_BNDSTA_TAIL)-1))
fe3d197f DH	48
fe3d197f DH	49	#define MPX_BNDCFG_ADDR_MASK (~((1UL<<MPX_BNDCFG_TAIL)-1))
57319d80 QR	50	#define MPX_BNDSTA_ERROR_CODE 0x3
57319d80 QR	51
1de4fa14 DH	52	#define MPX_BD_ENTRY_MASK ((1<<MPX_BD_ENTRY_OFFSET)-1)
	53	#define MPX_BT_ENTRY_MASK ((1<<MPX_BT_ENTRY_OFFSET)-1)
	54	#define MPX_GET_BD_ENTRY_OFFSET(addr) ((((addr)>>(MPX_BT_ENTRY_OFFSET+ \
	55	MPX_IGN_BITS)) & MPX_BD_ENTRY_MASK) << MPX_BD_ENTRY_SHIFT)
	56	#define MPX_GET_BT_ENTRY_OFFSET(addr) ((((addr)>>MPX_IGN_BITS) & \
	57	MPX_BT_ENTRY_MASK) << MPX_BT_ENTRY_SHIFT)
	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)
	63	{
	64	return (mm->bd_addr != MPX_INVALID_BOUNDS_DIR);
	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	*/
	72	mm->bd_addr = MPX_INVALID_BOUNDS_DIR;
	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 */