1#ifndef _ASM_X86_MPX_H
2#define _ASM_X86_MPX_H
3
4#include <linux/types.h>
5#include <asm/ptrace.h>
6#include <asm/insn.h>
7
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
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
29#define MPX_BD_ENTRY_TAIL	3
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
38#define MPX_BD_ENTRY_TAIL	2
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
45#define MPX_BNDSTA_TAIL		2
46#define MPX_BNDCFG_TAIL		12
47#define MPX_BNDSTA_ADDR_MASK	(~((1UL<<MPX_BNDSTA_TAIL)-1))
48#define MPX_BNDCFG_ADDR_MASK	(~((1UL<<MPX_BNDCFG_TAIL)-1))
49#define MPX_BT_ADDR_MASK	(~((1UL<<MPX_BD_ENTRY_TAIL)-1))
50
51#define MPX_BNDCFG_ADDR_MASK	(~((1UL<<MPX_BNDCFG_TAIL)-1))
52#define MPX_BNDSTA_ERROR_CODE	0x3
53
54#define MPX_BD_ENTRY_MASK	((1<<MPX_BD_ENTRY_OFFSET)-1)
55#define MPX_BT_ENTRY_MASK	((1<<MPX_BT_ENTRY_OFFSET)-1)
56#define MPX_GET_BD_ENTRY_OFFSET(addr)	((((addr)>>(MPX_BT_ENTRY_OFFSET+ \
57		MPX_IGN_BITS)) & MPX_BD_ENTRY_MASK) << MPX_BD_ENTRY_SHIFT)
58#define MPX_GET_BT_ENTRY_OFFSET(addr)	((((addr)>>MPX_IGN_BITS) & \
59		MPX_BT_ENTRY_MASK) << MPX_BT_ENTRY_SHIFT)
60
61#ifdef CONFIG_X86_INTEL_MPX
62siginfo_t *mpx_generate_siginfo(struct pt_regs *regs,
63				struct xsave_struct *xsave_buf);
64int mpx_handle_bd_fault(struct xsave_struct *xsave_buf);
65static inline int kernel_managing_mpx_tables(struct mm_struct *mm)
66{
67	return (mm->bd_addr != MPX_INVALID_BOUNDS_DIR);
68}
69static inline void mpx_mm_init(struct mm_struct *mm)
70{
71	/*
72	 * NULL is theoretically a valid place to put the bounds
73	 * directory, so point this at an invalid address.
74	 */
75	mm->bd_addr = MPX_INVALID_BOUNDS_DIR;
76}
77void mpx_notify_unmap(struct mm_struct *mm, struct vm_area_struct *vma,
78		      unsigned long start, unsigned long end);
79#else
80static inline siginfo_t *mpx_generate_siginfo(struct pt_regs *regs,
81					      struct xsave_struct *xsave_buf)
82{
83	return NULL;
84}
85static inline int mpx_handle_bd_fault(struct xsave_struct *xsave_buf)
86{
87	return -EINVAL;
88}
89static inline int kernel_managing_mpx_tables(struct mm_struct *mm)
90{
91	return 0;
92}
93static inline void mpx_mm_init(struct mm_struct *mm)
94{
95}
96static inline void mpx_notify_unmap(struct mm_struct *mm,
97				    struct vm_area_struct *vma,
98				    unsigned long start, unsigned long end)
99{
100}
101#endif /* CONFIG_X86_INTEL_MPX */
102
103#endif /* _ASM_X86_MPX_H */
104