1 // SPDX-License-Identifier: GPL-2.0-only !! 1 // SPDX-License-Identifier: GPL-2.0
2 /* <<
3 * Copyright (C) 2023 Loongson Technology Corp <<
4 * <<
5 * Based on arch/arm64/kernel/jump_label.c <<
6 */ <<
7 #include <linux/kernel.h> 2 #include <linux/kernel.h>
>> 3 #include <linux/types.h>
>> 4 #include <linux/mutex.h>
>> 5 #include <linux/cpu.h>
>> 6
8 #include <linux/jump_label.h> 7 #include <linux/jump_label.h>
9 #include <asm/inst.h> !! 8 #include <linux/memory.h>
>> 9
>> 10 #include <asm/cacheflush.h>
10 11
11 void arch_jump_label_transform(struct jump_ent !! 12 void arch_jump_label_transform(struct jump_entry *entry,
>> 13 enum jump_label_type type)
12 { 14 {
13 u32 insn; !! 15 u32 *insn = (u32 *) (unsigned long) entry->code;
14 void *addr = (void *)jump_entry_code(e !! 16 u32 val;
>> 17
>> 18 if (type == JUMP_LABEL_JMP) {
>> 19 s32 off = (s32)entry->target - (s32)entry->code;
>> 20 bool use_v9_branch = false;
>> 21
>> 22 BUG_ON(off & 3);
15 23
16 if (type == JUMP_LABEL_JMP) !! 24 #ifdef CONFIG_SPARC64
17 insn = larch_insn_gen_b(jump_e !! 25 if (off <= 0xfffff && off >= -0x100000)
18 else !! 26 use_v9_branch = true;
19 insn = larch_insn_gen_nop(); !! 27 #endif
>> 28 if (use_v9_branch) {
>> 29 /* WDISP19 - target is . + immed << 2 */
>> 30 /* ba,pt %xcc, . + off */
>> 31 val = 0x10680000 | (((u32) off >> 2) & 0x7ffff);
>> 32 } else {
>> 33 /* WDISP22 - target is . + immed << 2 */
>> 34 BUG_ON(off > 0x7fffff);
>> 35 BUG_ON(off < -0x800000);
>> 36 /* ba . + off */
>> 37 val = 0x10800000 | (((u32) off >> 2) & 0x3fffff);
>> 38 }
>> 39 } else {
>> 40 val = 0x01000000;
>> 41 }
20 42
21 larch_insn_patch_text(addr, insn); !! 43 mutex_lock(&text_mutex);
>> 44 *insn = val;
>> 45 flushi(insn);
>> 46 mutex_unlock(&text_mutex);
22 } 47 }
23 48
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