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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
dff9d3c2 DM |
2 | #include <linux/kernel.h> |
3 | #include <linux/types.h> | |
4 | #include <linux/mutex.h> | |
5 | #include <linux/cpu.h> | |
6 | ||
7 | #include <linux/jump_label.h> | |
8 | #include <linux/memory.h> | |
9 | ||
8befc9f2 DM |
10 | #include <asm/cacheflush.h> |
11 | ||
dff9d3c2 DM |
12 | #ifdef HAVE_JUMP_LABEL |
13 | ||
14 | void arch_jump_label_transform(struct jump_entry *entry, | |
15 | enum jump_label_type type) | |
16 | { | |
dff9d3c2 | 17 | u32 *insn = (u32 *) (unsigned long) entry->code; |
9d9fa230 | 18 | u32 val; |
dff9d3c2 | 19 | |
76b235c6 | 20 | if (type == JUMP_LABEL_JMP) { |
dff9d3c2 | 21 | s32 off = (s32)entry->target - (s32)entry->code; |
9d9fa230 JC |
22 | bool use_v9_branch = false; |
23 | ||
24 | BUG_ON(off & 3); | |
dff9d3c2 DM |
25 | |
26 | #ifdef CONFIG_SPARC64 | |
9d9fa230 JC |
27 | if (off <= 0xfffff && off >= -0x100000) |
28 | use_v9_branch = true; | |
dff9d3c2 | 29 | #endif |
9d9fa230 JC |
30 | if (use_v9_branch) { |
31 | /* WDISP19 - target is . + immed << 2 */ | |
32 | /* ba,pt %xcc, . + off */ | |
33 | val = 0x10680000 | (((u32) off >> 2) & 0x7ffff); | |
34 | } else { | |
35 | /* WDISP22 - target is . + immed << 2 */ | |
36 | BUG_ON(off > 0x7fffff); | |
37 | BUG_ON(off < -0x800000); | |
38 | /* ba . + off */ | |
39 | val = 0x10800000 | (((u32) off >> 2) & 0x3fffff); | |
40 | } | |
dff9d3c2 DM |
41 | } else { |
42 | val = 0x01000000; | |
43 | } | |
44 | ||
dff9d3c2 DM |
45 | mutex_lock(&text_mutex); |
46 | *insn = val; | |
47 | flushi(insn); | |
48 | mutex_unlock(&text_mutex); | |
dff9d3c2 DM |
49 | } |
50 | ||
dff9d3c2 | 51 | #endif |