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
62 siginfo_t *mpx_generate_siginfo(struct pt_regs *regs,
63 struct xsave_struct *xsave_buf);
64 int mpx_handle_bd_fault(struct xsave_struct *xsave_buf);
kernel_managing_mpx_tables(struct mm_struct * mm)65 static inline int kernel_managing_mpx_tables(struct mm_struct *mm)
66 {
67 return (mm->bd_addr != MPX_INVALID_BOUNDS_DIR);
68 }
mpx_mm_init(struct mm_struct * mm)69 static 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 }
77 void mpx_notify_unmap(struct mm_struct *mm, struct vm_area_struct *vma,
78 unsigned long start, unsigned long end);
79 #else
mpx_generate_siginfo(struct pt_regs * regs,struct xsave_struct * xsave_buf)80 static inline siginfo_t *mpx_generate_siginfo(struct pt_regs *regs,
81 struct xsave_struct *xsave_buf)
82 {
83 return NULL;
84 }
mpx_handle_bd_fault(struct xsave_struct * xsave_buf)85 static inline int mpx_handle_bd_fault(struct xsave_struct *xsave_buf)
86 {
87 return -EINVAL;
88 }
kernel_managing_mpx_tables(struct mm_struct * mm)89 static inline int kernel_managing_mpx_tables(struct mm_struct *mm)
90 {
91 return 0;
92 }
mpx_mm_init(struct mm_struct * mm)93 static inline void mpx_mm_init(struct mm_struct *mm)
94 {
95 }
mpx_notify_unmap(struct mm_struct * mm,struct vm_area_struct * vma,unsigned long start,unsigned long end)96 static 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