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// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (C) 2019 Helge Deller <deller@gmx.de>
*
* Based on arch/arm64/kernel/jump_label.c
*/
#include <linux/kernel.h>
#include <linux/jump_label.h>
#include <linux/bug.h>
#include <asm/alternative.h>
#include <asm/patch.h>
static inline int reassemble_17(int as17)
{
return (((as17 & 0x10000) >> 16) |
((as17 & 0x0f800) << 5) |
((as17 & 0x00400) >> 8) |
((as17 & 0x003ff) << 3));
}
void arch_jump_label_transform(struct jump_entry *entry,
enum jump_label_type type)
{
void *addr = (void *)jump_entry_code(entry);
u32 insn;
if (type == JUMP_LABEL_JMP) {
void *target = (void *)jump_entry_target(entry);
int distance = target - addr;
/*
* Encode the PA1.1 "b,n" instruction with a 17-bit
* displacement. In case we hit the BUG(), we could use
* another branch instruction with a 22-bit displacement on
* 64-bit CPUs instead. But this seems sufficient for now.
*/
distance -= 8;
BUG_ON(distance > 262143 || distance < -262144);
insn = 0xe8000002 | reassemble_17(distance >> 2);
} else {
insn = INSN_NOP;
}
patch_text(addr, insn);
}
void arch_jump_label_transform_static(struct jump_entry *entry,
enum jump_label_type type)
{
/*
* We use the architected NOP in arch_static_branch, so there's no
* need to patch an identical NOP over the top of it here. The core
* will call arch_jump_label_transform from a module notifier if the
* NOP needs to be replaced by a branch.
*/
}
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