jump_label.c

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#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/mutex.h>
#include <linux/cpu.h>

#include <linux/jump_label.h>
#include <linux/memory.h>

#include <asm/cacheflush.h>

#ifdef HAVE_JUMP_LABEL

void arch_jump_label_transform(struct jump_entry *entry,
                   enum jump_label_type type)
{
    u32 val;
    u32 *insn = (u32 *) (unsigned long) entry->code;

    if (type == JUMP_LABEL_ENABLE) {
        s32 off = (s32)entry->target - (s32)entry->code;

#ifdef CONFIG_SPARC64
        /* ba,pt %xcc, . + (off << 2) */
        val = 0x10680000 | ((u32) off >> 2);
#else
        /* ba . + (off << 2) */
        val = 0x10800000 | ((u32) off >> 2);
#endif
    } else {
        val = 0x01000000;
    }

    get_online_cpus();
    mutex_lock(&text_mutex);
    *insn = val;
    flushi(insn);
    mutex_unlock(&text_mutex);
    put_online_cpus();
}

#endif