52 lines
1.1 KiB
C
52 lines
1.1 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
#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 *insn = (u32 *) (unsigned long) entry->code;
|
|
u32 val;
|
|
|
|
if (type == JUMP_LABEL_JMP) {
|
|
s32 off = (s32)entry->target - (s32)entry->code;
|
|
bool use_v9_branch = false;
|
|
|
|
BUG_ON(off & 3);
|
|
|
|
#ifdef CONFIG_SPARC64
|
|
if (off <= 0xfffff && off >= -0x100000)
|
|
use_v9_branch = true;
|
|
#endif
|
|
if (use_v9_branch) {
|
|
/* WDISP19 - target is . + immed << 2 */
|
|
/* ba,pt %xcc, . + off */
|
|
val = 0x10680000 | (((u32) off >> 2) & 0x7ffff);
|
|
} else {
|
|
/* WDISP22 - target is . + immed << 2 */
|
|
BUG_ON(off > 0x7fffff);
|
|
BUG_ON(off < -0x800000);
|
|
/* ba . + off */
|
|
val = 0x10800000 | (((u32) off >> 2) & 0x3fffff);
|
|
}
|
|
} else {
|
|
val = 0x01000000;
|
|
}
|
|
|
|
mutex_lock(&text_mutex);
|
|
*insn = val;
|
|
flushi(insn);
|
|
mutex_unlock(&text_mutex);
|
|
}
|
|
|
|
#endif
|