projects / linux-2.6-block.git / blame
| Commit | Line | Data |
|---|---|---|
| b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
| d9f5ab7b JB |
2 | #ifndef _ASM_X86_JUMP_LABEL_H |
| 3 | #define _ASM_X86_JUMP_LABEL_H | |
| 4 | ||
| d9f5ab7b JB |
5 | #define JUMP_LABEL_NOP_SIZE 5 |
| 6 | ||
| c3c7f14a SR |
7 | #ifdef CONFIG_X86_64 |
| 8 | # define STATIC_KEY_INIT_NOP P6_NOP5_ATOMIC | |
| 9 | #else | |
| 10 | # define STATIC_KEY_INIT_NOP GENERIC_NOP5_ATOMIC | |
| 11 | #endif | |
| d430d3d7 | 12 | |
| 2671c3e4 AL |
13 | #include <asm/asm.h> |
| 14 | #include <asm/nops.h> | |
| 15 | ||
| 16 | #ifndef __ASSEMBLY__ | |
| 17 | ||
| 18 | #include <linux/stringify.h> | |
| 19 | #include <linux/types.h> | |
| 20 | ||
| 11276d53 | 21 | static __always_inline bool arch_static_branch(struct static_key *key, bool branch) |
| d430d3d7 | 22 | { |
| e769742d IM |
23 | asm_volatile_goto("1:" |
| 24 | ".byte " __stringify(STATIC_KEY_INIT_NOP) "\n\t" | |
| 25 | ".pushsection __jump_table, \"aw\" \n\t" | |
| 26 | _ASM_ALIGN "\n\t" | |
| 27 | ".long 1b - ., %l[l_yes] - . \n\t" | |
| 28 | _ASM_PTR "%c0 + %c1 - .\n\t" | |
| 29 | ".popsection \n\t" | |
| 30 | : : "i" (key), "i" (branch) : : l_yes); | |
| 31 | ||
| 11276d53 PZ |
32 | return false; |
| 33 | l_yes: | |
| 34 | return true; | |
| 35 | } | |
| 36 | ||
| 37 | static __always_inline bool arch_static_branch_jump(struct static_key *key, bool branch) | |
| 38 | { | |
| e769742d IM |
39 | asm_volatile_goto("1:" |
| 40 | ".byte 0xe9\n\t .long %l[l_yes] - 2f\n\t" | |
| 41 | "2:\n\t" | |
| 42 | ".pushsection __jump_table, \"aw\" \n\t" | |
| 43 | _ASM_ALIGN "\n\t" | |
| 44 | ".long 1b - ., %l[l_yes] - . \n\t" | |
| 45 | _ASM_PTR "%c0 + %c1 - .\n\t" | |
| 46 | ".popsection \n\t" | |
| d420acd8 | 47 | : : "i" (key), "i" (branch) : : l_yes); |
| 11276d53 | 48 | |
| d430d3d7 JB |
49 | return false; |
| 50 | l_yes: | |
| 51 | return true; | |
| 52 | } | |
| d9f5ab7b | 53 | |
| 2671c3e4 AL |
54 | #else /* __ASSEMBLY__ */ |
| 55 | ||
| e769742d IM |
56 | .macro STATIC_JUMP_IF_TRUE target, key, def |
| 57 | .Lstatic_jump_\@: | |
| 58 | .if \def | |
| 59 | /* Equivalent to "jmp.d32 \target" */ | |
| 60 | .byte 0xe9 | |
| 61 | .long \target - .Lstatic_jump_after_\@ | |
| 62 | .Lstatic_jump_after_\@: | |
| 63 | .else | |
| 64 | .byte STATIC_KEY_INIT_NOP | |
| 65 | .endif | |
| 2671c3e4 AL |
66 | .pushsection __jump_table, "aw" |
| 67 | _ASM_ALIGN | |
| e769742d IM |
68 | .long .Lstatic_jump_\@ - ., \target - . |
| 69 | _ASM_PTR \key - . | |
| 2671c3e4 AL |
70 | .popsection |
| 71 | .endm | |
| 72 | ||
| e769742d IM |
73 | .macro STATIC_JUMP_IF_FALSE target, key, def |
| 74 | .Lstatic_jump_\@: | |
| 75 | .if \def | |
| 76 | .byte STATIC_KEY_INIT_NOP | |
| 77 | .else | |
| 78 | /* Equivalent to "jmp.d32 \target" */ | |
| 79 | .byte 0xe9 | |
| 80 | .long \target - .Lstatic_jump_after_\@ | |
| 81 | .Lstatic_jump_after_\@: | |
| 82 | .endif | |
| 2671c3e4 AL |
83 | .pushsection __jump_table, "aw" |
| 84 | _ASM_ALIGN | |
| e769742d IM |
85 | .long .Lstatic_jump_\@ - ., \target - . |
| 86 | _ASM_PTR \key + 1 - . | |
| 2671c3e4 AL |
87 | .popsection |
| 88 | .endm | |
| 89 | ||
| 90 | #endif /* __ASSEMBLY__ */ | |
| 91 | ||
| d9f5ab7b | 92 | #endif |