61 lines
1.5 KiB
C
61 lines
1.5 KiB
C
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/* 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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#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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#define JUMP_TABLE_ENTRY(key, label) \
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".pushsection __jump_table, \"aw\" \n\t" \
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_ASM_ALIGN "\n\t" \
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".long 1b - . \n\t" \
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".long " label " - . \n\t" \
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_ASM_PTR " " key " - . \n\t" \
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".popsection \n\t"
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/* This macro is also expanded on the Rust side. */
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#ifdef CONFIG_HAVE_JUMP_LABEL_HACK
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#define ARCH_STATIC_BRANCH_ASM(key, label) \
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"1: jmp " label " # objtool NOPs this \n\t" \
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JUMP_TABLE_ENTRY(key " + 2", label)
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#else /* !CONFIG_HAVE_JUMP_LABEL_HACK */
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#define ARCH_STATIC_BRANCH_ASM(key, label) \
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"1: .byte " __stringify(BYTES_NOP5) "\n\t" \
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JUMP_TABLE_ENTRY(key, label)
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#endif /* CONFIG_HAVE_JUMP_LABEL_HACK */
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static __always_inline bool arch_static_branch(struct static_key * const key, const bool branch)
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{
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asm goto(ARCH_STATIC_BRANCH_ASM("%c0 + %c1", "%l[l_yes]")
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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 * const key, const bool branch)
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{
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asm goto("1:"
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"jmp %l[l_yes]\n\t"
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JUMP_TABLE_ENTRY("%c0 + %c1", "%l[l_yes]")
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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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extern int arch_jump_entry_size(struct jump_entry *entry);
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#endif /* __ASSEMBLY__ */
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#endif
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