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94 lines
1.9 KiB
94 lines
1.9 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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#ifndef _ASM_X86_JUMP_LABEL_H |
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#define _ASM_X86_JUMP_LABEL_H |
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#define HAVE_JUMP_LABEL_BATCH |
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#define JUMP_LABEL_NOP_SIZE 5 |
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#ifdef CONFIG_X86_64 |
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# define STATIC_KEY_INIT_NOP P6_NOP5_ATOMIC |
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#else |
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# define STATIC_KEY_INIT_NOP GENERIC_NOP5_ATOMIC |
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#endif |
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#include <asm/asm.h> |
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#include <asm/nops.h> |
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#ifndef __ASSEMBLY__ |
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#include <linux/stringify.h> |
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#include <linux/types.h> |
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static __always_inline bool arch_static_branch(struct static_key *key, bool branch) |
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{ |
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asm_volatile_goto("1:" |
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".byte " __stringify(STATIC_KEY_INIT_NOP) "\n\t" |
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".pushsection __jump_table, \"aw\" \n\t" |
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_ASM_ALIGN "\n\t" |
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".long 1b - ., %l[l_yes] - . \n\t" |
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_ASM_PTR "%c0 + %c1 - .\n\t" |
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".popsection \n\t" |
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: : "i" (key), "i" (branch) : : l_yes); |
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return false; |
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l_yes: |
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return true; |
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} |
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static __always_inline bool arch_static_branch_jump(struct static_key *key, bool branch) |
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{ |
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asm_volatile_goto("1:" |
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".byte 0xe9\n\t .long %l[l_yes] - 2f\n\t" |
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"2:\n\t" |
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".pushsection __jump_table, \"aw\" \n\t" |
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_ASM_ALIGN "\n\t" |
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".long 1b - ., %l[l_yes] - . \n\t" |
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_ASM_PTR "%c0 + %c1 - .\n\t" |
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".popsection \n\t" |
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: : "i" (key), "i" (branch) : : l_yes); |
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return false; |
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l_yes: |
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return true; |
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} |
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#else /* __ASSEMBLY__ */ |
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.macro STATIC_JUMP_IF_TRUE target, key, def |
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.Lstatic_jump_\@: |
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.if \def |
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/* Equivalent to "jmp.d32 \target" */ |
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.byte 0xe9 |
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.long \target - .Lstatic_jump_after_\@ |
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.Lstatic_jump_after_\@: |
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.else |
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.byte STATIC_KEY_INIT_NOP |
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.endif |
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.pushsection __jump_table, "aw" |
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_ASM_ALIGN |
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.long .Lstatic_jump_\@ - ., \target - . |
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_ASM_PTR \key - . |
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.popsection |
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.endm |
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.macro STATIC_JUMP_IF_FALSE target, key, def |
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.Lstatic_jump_\@: |
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.if \def |
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.byte STATIC_KEY_INIT_NOP |
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.else |
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/* Equivalent to "jmp.d32 \target" */ |
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.byte 0xe9 |
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.long \target - .Lstatic_jump_after_\@ |
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.Lstatic_jump_after_\@: |
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.endif |
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.pushsection __jump_table, "aw" |
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_ASM_ALIGN |
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.long .Lstatic_jump_\@ - ., \target - . |
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_ASM_PTR \key + 1 - . |
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.popsection |
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.endm |
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#endif /* __ASSEMBLY__ */ |
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#endif
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