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/* SPDX-License-Identifier: GPL-2.0 */ #ifndef _ASM_X86_JUMP_LABEL_H #define _ASM_X86_JUMP_LABEL_H #define HAVE_JUMP_LABEL_BATCH #include <asm/asm.h> #include <asm/nops.h> #ifndef __ASSEMBLY__ #include <linux/stringify.h> #include <linux/types.h> #define JUMP_TABLE_ENTRY(key, label) \ ".pushsection __jump_table, \"aw\" \n\t" \ _ASM_ALIGN "\n\t" \ ".long 1b - . \n\t" \ ".long " label " - . \n\t" \ _ASM_PTR " " key " - . \n\t" \ ".popsection \n\t" /* This macro is also expanded on the Rust side. */ #ifdef CONFIG_HAVE_JUMP_LABEL_HACK #define ARCH_STATIC_BRANCH_ASM(key, label) \ "1: jmp " label " # objtool NOPs this \n\t" \ JUMP_TABLE_ENTRY(key " + 2", label) #else /* !CONFIG_HAVE_JUMP_LABEL_HACK */ #define ARCH_STATIC_BRANCH_ASM(key, label) \ "1: .byte " __stringify(BYTES_NOP5) "\n\t" \ JUMP_TABLE_ENTRY(key, label) #endif /* CONFIG_HAVE_JUMP_LABEL_HACK */ static __always_inline bool arch_static_branch(struct static_key * const key, const bool branch) { asm goto(ARCH_STATIC_BRANCH_ASM("%c0 + %c1", "%l[l_yes]") : : "i" (key), "i" (branch) : : l_yes); return false; l_yes: return true; } static __always_inline bool arch_static_branch_jump(struct static_key * const key, const bool branch) { asm goto("1:" "jmp %l[l_yes]\n\t" JUMP_TABLE_ENTRY("%c0 + %c1", "%l[l_yes]") : : "i" (key), "i" (branch) : : l_yes); return false; l_yes: return true; } extern int arch_jump_entry_size(struct jump_entry *entry); #endif /* __ASSEMBLY__ */ #endif