75 lines
1.6 KiB
C
75 lines
1.6 KiB
C
#ifndef _LINUX_JUMP_LABEL_H
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#define _LINUX_JUMP_LABEL_H
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#if defined(CC_HAVE_ASM_GOTO) && defined(CONFIG_HAVE_ARCH_JUMP_LABEL)
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# include <asm/jump_label.h>
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# define HAVE_JUMP_LABEL
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#endif
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enum jump_label_type {
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JUMP_LABEL_ENABLE,
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JUMP_LABEL_DISABLE
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};
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struct module;
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#ifdef HAVE_JUMP_LABEL
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extern struct jump_entry __start___jump_table[];
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extern struct jump_entry __stop___jump_table[];
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extern void arch_jump_label_transform(struct jump_entry *entry,
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enum jump_label_type type);
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extern void arch_jump_label_text_poke_early(jump_label_t addr);
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extern void jump_label_update(unsigned long key, enum jump_label_type type);
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extern void jump_label_apply_nops(struct module *mod);
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extern int jump_label_text_reserved(void *start, void *end);
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#define jump_label_enable(key) \
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jump_label_update((unsigned long)key, JUMP_LABEL_ENABLE);
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#define jump_label_disable(key) \
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jump_label_update((unsigned long)key, JUMP_LABEL_DISABLE);
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#else
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#define JUMP_LABEL(key, label) \
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do { \
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if (unlikely(*key)) \
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goto label; \
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} while (0)
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#define jump_label_enable(cond_var) \
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do { \
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*(cond_var) = 1; \
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} while (0)
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#define jump_label_disable(cond_var) \
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do { \
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*(cond_var) = 0; \
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} while (0)
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static inline int jump_label_apply_nops(struct module *mod)
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{
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return 0;
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}
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static inline int jump_label_text_reserved(void *start, void *end)
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{
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return 0;
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}
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#endif
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#define COND_STMT(key, stmt) \
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do { \
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__label__ jl_enabled; \
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JUMP_LABEL(key, jl_enabled); \
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if (0) { \
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jl_enabled: \
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stmt; \
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} \
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} while (0)
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#endif
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