70 lines
1.5 KiB
C
70 lines
1.5 KiB
C
/* 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 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("STATIC_BRANCH_NOP l_yes=\"%l[l_yes]\" key=\"%c0\" "
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"branch=\"%c1\""
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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("STATIC_BRANCH_JMP l_yes=\"%l[l_yes]\" key=\"%c0\" "
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"branch=\"%c1\""
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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_BRANCH_NOP l_yes:req key:req branch:req
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.Lstatic_branch_nop_\@:
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.byte STATIC_KEY_INIT_NOP
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.Lstatic_branch_no_after_\@:
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.pushsection __jump_table, "aw"
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_ASM_ALIGN
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.long .Lstatic_branch_nop_\@ - ., \l_yes - .
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_ASM_PTR \key + \branch - .
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.popsection
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.endm
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.macro STATIC_BRANCH_JMP l_yes:req key:req branch:req
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.Lstatic_branch_jmp_\@:
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.byte 0xe9
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.long \l_yes - .Lstatic_branch_jmp_after_\@
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.Lstatic_branch_jmp_after_\@:
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.pushsection __jump_table, "aw"
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_ASM_ALIGN
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.long .Lstatic_branch_jmp_\@ - ., \l_yes - .
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_ASM_PTR \key + \branch - .
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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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