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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 7143 | serge | 1 | /* |
| 2 | * Supervisor Mode Access Prevention support |
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| 3 | * |
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| 4 | * Copyright (C) 2012 Intel Corporation |
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| 5 | * Author: H. Peter Anvin |
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| 6 | * |
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| 7 | * This program is free software; you can redistribute it and/or |
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| 8 | * modify it under the terms of the GNU General Public License |
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| 9 | * as published by the Free Software Foundation; version 2 |
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| 10 | * of the License. |
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| 11 | */ |
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| 12 | |||
| 13 | #ifndef _ASM_X86_SMAP_H |
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| 14 | #define _ASM_X86_SMAP_H |
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| 15 | |||
| 16 | #include |
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| 17 | #include |
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| 18 | #include |
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| 19 | |||
| 20 | /* "Raw" instruction opcodes */ |
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| 21 | #define __ASM_CLAC .byte 0x0f,0x01,0xca |
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| 22 | #define __ASM_STAC .byte 0x0f,0x01,0xcb |
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| 23 | |||
| 24 | #ifdef __ASSEMBLY__ |
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| 25 | |||
| 26 | #include |
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| 27 | |||
| 28 | #ifdef CONFIG_X86_SMAP |
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| 29 | |||
| 30 | #define ASM_CLAC \ |
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| 31 | ALTERNATIVE "", __stringify(__ASM_CLAC), X86_FEATURE_SMAP |
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| 32 | |||
| 33 | #define ASM_STAC \ |
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| 34 | ALTERNATIVE "", __stringify(__ASM_STAC), X86_FEATURE_SMAP |
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| 35 | |||
| 36 | #else /* CONFIG_X86_SMAP */ |
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| 37 | |||
| 38 | #define ASM_CLAC |
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| 39 | #define ASM_STAC |
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| 40 | |||
| 41 | #endif /* CONFIG_X86_SMAP */ |
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| 42 | |||
| 43 | #else /* __ASSEMBLY__ */ |
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| 44 | |||
| 45 | #include |
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| 46 | |||
| 47 | #ifdef CONFIG_X86_SMAP |
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| 48 | |||
| 49 | static __always_inline void clac(void) |
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| 50 | { |
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| 51 | /* Note: a barrier is implicit in alternative() */ |
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| 52 | alternative("", __stringify(__ASM_CLAC), X86_FEATURE_SMAP); |
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| 53 | } |
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| 54 | |||
| 55 | static __always_inline void stac(void) |
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| 56 | { |
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| 57 | /* Note: a barrier is implicit in alternative() */ |
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| 58 | alternative("", __stringify(__ASM_STAC), X86_FEATURE_SMAP); |
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| 59 | } |
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| 60 | |||
| 61 | /* These macros can be used in asm() statements */ |
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| 62 | #define ASM_CLAC \ |
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| 63 | ALTERNATIVE("", __stringify(__ASM_CLAC), X86_FEATURE_SMAP) |
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| 64 | #define ASM_STAC \ |
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| 65 | ALTERNATIVE("", __stringify(__ASM_STAC), X86_FEATURE_SMAP) |
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| 66 | |||
| 67 | #else /* CONFIG_X86_SMAP */ |
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| 68 | |||
| 69 | static inline void clac(void) { } |
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| 70 | static inline void stac(void) { } |
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| 71 | |||
| 72 | #define ASM_CLAC |
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| 73 | #define ASM_STAC |
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| 74 | |||
| 75 | #endif /* CONFIG_X86_SMAP */ |
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| 76 | |||
| 77 | #endif /* __ASSEMBLY__ */ |
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| 78 | |||
| 79 | #endif /* _ASM_X86_SMAP_H */ |