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